Doxycycline scientific update |
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Middle East Afr J Ophthalmol. 2010 Apr;17(2):186-8.
Al Arfaj K, Al Zamil W.
Department of Ophthalmology, College of Medicine, King Faisal University, Dammam, Saudi Arabia.
Corneal perforation in ocular rosacea [Spontaneous corneal perforation in ocular rosacea.]
Rosacea is a dermatologic condition that affects the midfacial region. Ocular rosacea is most frequently diagnosed when cutaneous signs and symptoms are also present. Ocular manifestations are essentially confined to the eyelids and ocular surface. Ocular involvement ranges from minor irritation, dryness, and blurry vision to potentially severe ocular surface disruption including corneal ulcers, vascularization and rarely perforation. We present a 49-year-old Saudi Arabian female with the diagnosis of rosacea who presented with a peripheral corneal performation. The perforation was successfully managed by surgical repair, oral doxycycline and topical steroid. The final best corrected visual acuity was 20/30 after treatment. Early referral to an ophthalmologist and careful long-term follow-up are recommended.
Hum Gene Ther. 2010 Jul 8. [Epub ahead of print]
Brown CY, Sadlon T, Gargett T, Melville E, Zhang R, Drabsch Y, Ling M, Strathdee CA, Gonda TJ, Barry SC.
1 Women's and Children's Health Research Institute , Adelaide, South Australia 5006, Australia .
Restriction gene through single lentiviral [Robust, Reversible Gene Knockdown Using a Single Lentiviral Short Hairpin RNA Vector.]
Abstract Manipulation of gene expression is an invaluable tool to study gene function in vitro and in vivo. The application of small inhibitory RNAs to knock down gene expression provides a relatively simple, elegant, but transient approach to study gene function in many cell types as well as in whole animals. Short hairpin structures (shRNAs) are a logical advance as they can be expressed continuously and are hence suitable for stable gene knockdown. Drug-inducible systems have now been developed; however, application of the technology has been hampered by persistent problems with low or transient expression, leakiness or poor inducibility of the short hairpin, and lack of reversibility. We have developed a robust, versatile, single lentiviral vector tool that delivers tightly regulated, fully reversible, doxycycline-responsive knockdown of target genes (FOXP3 and MYB), using single short hairpin RNAs. To demonstrate the capabilities of the vector we targeted FOXP3 because it plays a critical role in the development and function of regulatory T cells. We also targeted MYB because of its essential role in hematopoiesis and implication in breast cancer progression. The versatility of this vector is hence demonstrated by knockdown of distinct genes in two biologically separate systems.
Ethiop Med J. 2010 Jan;48(1):23-8.
Abera B, Bezabih B, Dessie A.
Department of Medical Microbiology, Immunology and Parasitology, College of Medicine and Health Science, Bahir Dar University. bayeabera@yahoo.com
Analysis of antimicrobial susceptibility in Ethiopia [Antimicrobial suceptibility of V. cholerae in north west, Ethiopia.]
OBJECTIVES: Various Vibrio cholerae serogroups cause cholera, which occurs as major epidemic disease in most developing countries. This study was aimed at determining the antimicrobial susceptibility patterns of V. cholerae and its serotypes from cholera cases. METHODS: The study was undertaken during cholera epidemics in North West Ethiopia from August 2006 to September 2008. Diarrheic stool samples were processed per the standard microbiology procedures at Bahir Dar Regional Health Research Laboratory. Antimicrobial susceptibility tests were performed using disc diffusion technique per Kirby-Bauer method. RESULTS: Eighty one V. cholerae 01 serotype Inaba were isolated from stools of cholera cases. Antibiograms of V. cholerae 01 Inaba showed that 71.6% of isolates were resistant against two, 18.4% to three and 5% to four antibiotics. All V. cholerae Inaba isolates were resistant to co-trimoxazol 81 (100%). High levels of resistance were also shown to chloramphenicol 76 (94%) and ampicillin 72 (89%) with least resistance to erythromycin 12 (15%), tetracycline 5 (6.2) and ciprofloxacilin 1 (1.2%). However, all isolates remain susceptible to doxycycline 81 (100%). CONCLUSION: In the study area, doxycycline or ciprofloxacilin could be used for treatment of adult cholera cases whereas erythromycin is alternative for young children. Antimicrobial susceptibility tests are strongly recommended for V. cholerae strains in treatment intervention during epidemics.
Indian J Pharmacol. 2009 Aug;41(4):173-5.
Deshmukh PV, Badgujar PC, Gatne MM.
Department of Pharmacology and Toxicology, Bombay Veterinary College, Mumbai - 400 012, India.
Red blood cell partitioning of doxycycline [In-vitro red blood cell partitioning of doxycycline.]
OBJECTIVE: In-vitro red blood cell (RBC) partitioning of doxycycline was studied to determine whether doxycycline penetrates RBC and its concentration was assayed keeping in view its high lipophilicity. MATERIALS AND METHODS: Standardization of doxycycline was performed in whole blood and plasma of cattle by microbiological assay using Bacillus subtillis ATCC 6633 as indicator organizm. Actual concentration of the drug was obtained by comparing zone inhibition with standard graph and the extent of partitioning was mathematically calculated. RESULTS: The R(2) value of standard graph for doxycycline was 0.9934 and 0.9727 for plasma and whole blood, respectively. Overall, RBC partitioning of doxycycline was found to be 18.40 +/- 1.70%. CONCLUSIONS: Overall RBC partitioning of doxycycline indicated low penetration into RBC. Plasma is the fluid suggested for pharmacokinetic evaluation of doxycycline.
Lung India. 2009 Jul;26(3):81-5.
Bhattacharyya P, Nag S, Bardhan S, Acharya D, Paul R, Dey R, Ghosh M, Dey R, Saha I.
Institute of Pulmocare and Research, R. G. Kar Medical College and Hospital, Kolkata, India.
Effect of doxycycline in idiopathic pulmonaryfibrosis patients The role of long-term doxycycline in patients of idiopathic pulmonaryfibrosis: The results of an open prospective trial.
OBJECTIVE: To evaluate the effect of long term use of doxycycline in IPF patients. MATERIALS AND METHODS: Patients of IPF, selected randomly from out patient services and diagnosed on the basis of HRCT chest, were put on doxycycline in an open prospective trial. They were followed up with monitoring of subjective well being along with measurement of pulse rate and arterial oxygen saturation at rest and after a fixed and certain exercise, forced vital capacity, six minutes walk test, St Georges Respiratory questionnaire, and serial chest X-rays. RESULTS: Out of seven patients put on doxycycline, six of them continued the drug for a mean period of 531.43 (+/- 328.88 days). All the patients tolerated the drug well and had shown uniform subjective and overall objective improvement in all the parameters concerned; the change in the radiological parameter being statistically significant. CONCLUSION: Doxycycline merits an appropriate clinical trial in the management of idiopathic pulmonary fibrosis. This widely used and relatively safe drug can add a new dimension to the therapeutic regimen. However, further in-depth studies will be required to evaluate its role in the management of IPF.
Turkiye Parazitol Derg. 2009;33(4):280-2.
Köse S, Kirakli C, Ozensoy Töz S, Kuzucu L, Akkoçlu G, Cevikel N.
Tepecik Eğitim ve Araştirma Hastanesi, Klinik Mikrobiyoloji ve Enfeksiyon Hastaliklari, Izmir, Turkey.
Two cases of plasmodium falciparum [Case report: two imported Plasmodium falciparum cases]
A 23 year-old Pakistani man presented at the emergency clinic of Tepecik Research and Training Hospital with the symptoms such as fever (39.3 degrees C), blurred consciousness, subicteric sclera and splenomegalia. In the laboratory examination, a slightly increase of the liver enzymes and anemia were detected. The gametocytes and trophozoites of Plasmodium falciparum were seen in a bone marrow aspiration and treatment was started with quinine and doxycycline but since resistance was detected to these medicines, mefloquine was chosen as alternative therapy. He was cured and discharged. The second case was also a Pakistani 20-year old man and he was a friend of first case. He presented at our hospital with the symptoms such as fever (39.4 degrees C), closed consciousness, icteric sclera and systolic soufflé in all cardiac foci. During the laboratory examination, severe anemia and trombocytopenia, and an increase in the liver enzymes were found. P. falciparum gametocytes and young trophozoites were seen in a blood smear stained with Giemsa. For treatment, mefloquine was used but unfortunately the patient died due to an adult respiratory distress syndrome (ARDS) complication. In this study, two cases with different clinical manifestations were presented to emphasize the importance of timing in starting the correct treatment.
Circ Cardiovasc Imaging. 2008 Nov;1(3):220-6. Epub 2008 Sep 17.
Turner GH, Olzinski AR, Bernard RE, Aravindhan K, Karr HW, Mirabile RC, Willette RN, Gough PJ, Jucker BM.
Cardiovascular and Urogenital Center of Excellence for Drug Discovery, GlaxoSmithKline, King of Prussia, PA 19406, USA.
Checking of aortic aneurysm formation in apoliproprotein E-deficient mice In vivo serial assessment of aortic aneurysm formation in apolipoprotein E-deficient mice via MRI.
BACKGROUND: Hyperlipidimic mice administered angiotensin II have been used for the study of abdominal aortic aneurysms (AAAs). The purpose of this study was to examine the use of MRI for studying AAA development and for examining the effects of pharmacological intervention on AAA development in the apolipoprotein E-deficient mouse. METHODS AND RESULTS: Suprarenal aortic aneurysms were generated in apolipoprotein E-deficient mice administered angiotensin II (1000 ng/kg per min) for up to 28 days. In vivo MRI was performed serially (once weekly) to assess AAA development and rupture. Comparison of AAA size as measured by in vivo and ex vivo MRI resulted in excellent agreement (r=0.96, P<0.0001). In addition, MRI correlated with histology-derived AAA area assessment (in vivo versus histology: r=0.84, P<0.0001; ex vivo versus histology: r=0.89, P<0.0001). In a separate study, angiotensin II-administered apolipoprotein E-deficient mice were treated with doxycycline (broad-based matrix metalloproteinase inhibitor; 30 mg/kg per day for 28 days). MRI was able to noninvasively assess a reduced rate of AAA development (46% versus 71%, P<0.05), a decreased AAA area (2.56 versus 4.02 mm(2), P<0.01), and decreased incidence of rupture (43% versus 100%) in treated versus control animals. Inhibition of aorta matrix metalloproteinase 2/9 activity was observed in the treated animals. CONCLUSIONS: These results demonstrate the use of MRI to noninvasively and temporally assess AAA development on pharmacological intervention in this preclinical cardiovascular disease model.
Med Trop (Mars). 2008 Dec;68(6):589-92.
Manga NM, Ndour CT, Diop SA, Dia NM, Ka-Sall R, Diop BM, Sow AI, Sow PS.
Clinique des Maladies Infectieuses et Tropicales, CHNU Fann, Dakar. nmmanga@hotmail.com
Statistics from the cholera cases occurred at Senegal [Cholera in Senegal from 2004 to 2006: lessons learned from successive outbreaks] [Article in French]
Between October 2004 and March 2006, a series of cholera outbreaks occurred in the West African nation of Senegal. The purpose of this study was to describe and analyze these outbreaks as a basis for prevention and control. A total of 29556 cases were reported during the 18-month epidemic. The attack rate ranged from 0.6 to 100 per 10(4) inhabitants depending on region. The epidemic unfolded in three phases. The first phase (11 weeks) was promptly contained using basic control measures such as public information campaigns and environmental hygiene. The second and longest phase (12 months) was marked by two outbreaks caused by massive religious gatherings and severe flooding. Cities particularly the capital Dakar (25.5% of cases) and the religious district of Touba in the north (41.1% of cases) were most affected due to the many social and environmental problems related to poor urban infrastructure. The isolated strains of Vibrio cholerae O1, biotype El Tor, were susceptible to doxycycline and fluoroquinolones (100%) but resistant to cotrimoxazole (90.3%). The overall death rate was 1.38%. Unfavorable prognostic factors included age over 60 years, delayed treatment and severe dehydration at the time of admission. Despite lower mortality this cholera epidemic was more widespread and longer than the previous outbreaks in Senegal and was associated with a trend to endemicity in urban areas.
J Dent Hyg. 2008 Oct;82 Suppl 3:10-5. Epub 2008 Oct 1.
Paquette DW, Ryan ME, Wilder RS.
Evidence and relevance of antimicrobials. [ Locally delivered antimicrobials: clinical evidence and relevance.]
Periodontitis is a common oral infection and inflammatory condition. Following treatment, residual or persistent periodontal inflammation is associated with disease progression and tooth loss. Cumulative evidence from clinical trials and meta-analyses support a complementary medical-mechanical model that combines locally delivered antimicrobials with scaling and root planing for the treatment of chronic periodontitis. Accordingly, greater pocket depth reductions and/or attachment level gains occur in patients treated with adjunctive locally administered antimicrobials (eg, tetracycline, chlorhexidine, doxycycline, and minocycline). These responses are clinically relevant because they are accompanied by a higher probability of patient maintenance or pocket resolution. Recent trials also indicate that locally administered antimicrobials may enhance the effects of periodontal surgical therapy and may reduce the signs of peri-implantitis. The consistency of these findings supports the use of locally administered antimicrobials for managing dental patients with chronic periodontitis.
Zhonghua Wai Ke Za Zhi. 2007 Dec 1;45(23):1634-6.
Jin WD, Chen XP, Yang SL, Xu ZQ, Zhang WG.
Department of Hepatic Surgery, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China.
Performance of hypoxia inducible factor on proliferation property of HepG2 cells [Inducible expression of hypoxia-inducible factor 1alpha on the proliferation and invasion property of HepG2 cells under normoxia in vitro] [Article in Chinese]
OBJECTIVE: To study the inducible expression of hypoxia-inducible factor 1alpha (HIF-1alpha) on the proliferation and invasion property of HepG2 cells under normoxia in vitro. METHODS: Constructed the HepG2(Tet-on-HIF-1alpha) cell line which could induce the expression of HIF-1alpha by doxycycline; Under normoxia in vitro, MTT assay was used to observe the proliferative and adhesive activity of cells, and the invasive activity was determined by transwell cell culture chamber method. RESULTS: Under normoxia, the HIF-1alpha mRNA and protein of HepG2(Tet-on-HIF-1alpha) cells could be induced up to (5.899 +/- 2.176) and (2.179 +/- 0.742) folds by doxycycline (1 microg/ml); There were no difference of A(490 nm) between the Dox(+)and Dox(-) group in experiment detecting the proliferation activity (P > 0.05); But in adhesive experiment, the A(490 nm) of Dox (+) group was 0.662 +/- 0.058, higher than the Dox(-) group 0.526 +/- 0.808 (P = 0.008); The invasive cell number of Dox(+) group was 37.611 +/- 8.424, but in the Dox(-) group, the number was 25.333 +/- 8.117 (P < 0.01). CONCLUSIONS: Under normoxia in vitro, the Tet-on gene regulate system could increase the HIF-1alpha protein by inducing the HIF-1alpha mRNA; HIF-1alpha has no influence with the proliferation activity, but it could enhance the adhesive and invasive properties of HepG2 cells.
Bull Acad Natl Med. 2007 Oct;191(7):1293-302; discussion 1302-3.
Touze JE, Debonne JM, Boutin JP.
Institut de Médecine Tropicale du Service de Santé des armées, Le Pharo, BP : 46, 13998-Marseille armées.
Present and future analysis for malaria in travellers and military persons [Current situation and future perspectives for malaria prophylaxis among travellers and military personnel] [Article in French]
Malaria remains a major public health problem, both for travellers and for the 40,000 French soldiers deployed each year to endemic areas. Epidemiological data show that imported malaria (IM) is on the increase, and that migrants account for more than 60% of malaria cases notified each year in France. The increase in IM among French military personnel is explained by prematurely terminated chemoprophylaxis on return, repeated short missions, and more cases of P. vivax and P. ovale infection. The choice of chemoprophylaxis depends mainly on the level of chloroquine resistance in the country visited. The atovaquone-proguanil combination is well tolerated and only requires 7 days of intake on return from the endemic area. Doxycycline monohydrate is cheaper and better-tolerated than mefloquine, and is thus preferred for French military personnel. However, its short half-life necessitates very good compliance. Chemoprophylaxis should be combined with vector control measures and with personal protection (impregnated bednets, protective clothing, repellents, and indoor insecticide spraying). The need for these measures should be clearly explained before departure, during the stay, and after return.
Przegl Lek. 2007;64 Suppl 3:38-40.
Kaciński M, Zajac A, Skowronek-Bała B, Kroczka S, Gergont A, Kubik A.
Department of Pediatric Neurology, Jagiellonian University, Krakow, Poland. neupedkr@cm-uj.krakow.pl
Analysis of disease in children. [CNS Lyme disease manifestation in children.]
BACKGROUND: Neurological symptoms develop in 10-20% of children with borreliosis. AIM OF THE STUDY: It was a presentation of clinical manifestation of neuroborreliosis in children. MATERIAL AND METHODS: Children with neuroborreliosis and other neurological diseases were admitted to the University Hospital during 2005-2006 without any selection. Of these 9 patients, there were seven males and two females, ranging in age between 3-17 years. Neurological diagnostic was performed using ELISA Biomedica kit and western blot bands. A 2-6 week sequential treatment with either i.v. ceftazidime or amoxicillin and oral doxycycline or amoxicillin was provided. Children were monitored regularly during the next 4-24 months. RESULTS: The 9 children with borreliosis constitute 0.53% of the pediatric neurology department's patients. The clinical manifestation of LD were usual and unusual from patient to patient. They included three cases of facial nerve paralysis (with bilateral paralysis in one case). In two cases, they included transverse myelitis and in a single case, hemiparesis, meningitis and acute ataxia. Typically, other patients with early stage borreliosis first manifest focal seizures, raising the suspicion that borreliosis could be responsible for triggering seizures. The antibiotic treatment was successful in 7 patients and only partially effective in 2 children with facial nerve paralysis. CONCLUSIONS: The most common symptom of neuroborreliosis in children is motor dysfunction. Acute ataxia may be a clinical presentation of neuroborreliosis. It is probable that borreliosis_triggers seizures in children with EEG abnormalities.
ANZ J Surg. 2007 May;77 Suppl 1:A3.
Skinner AM, Holland DJ, Taylor GB, Ellis-Pegler R, Jones WO, Paviour SD.
Auckland City Hospital, Auckland, New Zealand.
Bs13 the effect of antibiotic treatment of inflammatory breast disease associated with the isolation of lipophilic corynebacteria.
Granulomatous mastitis is a rare benign condition effecting women of reproductive age and is most commonly treated surgically. 11 received treatment with doxycycline, 5 women received alternative antibiotics, and one patient received no antibiotics. Results Among the 11 who received doxycycline, full resolution without surgery of disease was achieved in 9 women and further surgical management was required by 2.
Granulomatous mastitis is a rare benign condition effecting women of reproductive age and is most commonly treated surgically. It is an inflammatory disease
of the breast associated with the isolation of intracellular lipophilic corynebacteria and has a course of chronicity with recurrences. Purpose Our aim was
to observe the clinical response and subsequent course of women diagnosed with granulomatous mastitis and treated by a long course of lipophilic antibiotics.
We also recorded the concurrent requirement for surgical intervention. Methodology The clinical course of seventeen women with inflammatory breast disease
and microbiologic and histologic evidence of infection with Corynebacterium kroppenstedtii were prospectively followed. 11 received treatment with
doxycycline (or clindamycin if breast feeding), 5 women received alternative antibiotics, and one patient received no antibiotics. Results Among the 11 who
received doxycycline, full resolution without surgery of disease was achieved in 9 women while another woman showed improvement at follow up, further
surgical management was required by 2. All the five women who received alternative antibiotics also had surgery. They each had full resolution of disease at
follow up. Further admissions were required by one woman. Conclusion Optimal treatment for granulomatous mastitis is yet to be determined. We found promising
results with a small group of young women who were treated with the lipophilic antibiotic doxycycline alone. These had resolution of disease without
requiring surgical intervention.
J Biomol Tech. 2007 Apr;18(2):120-3.
Cawthorne C, Swindell R, Stratford IJ, Dive C, Welman A.
Cancer Research UK, Paterson Institute for Cancer Research, University of Manchester, Manchester, UK.
Comparison of doxycycline delivery methods for tet-inducible gene expression in a subcutaneous xenograft model.
There is no generally accepted standard of consequences of gene overexpression/down regulation. Here scientists compared four non-invasive methods of Dox delivery in vivo in drinking water, by gavage, as a jelly and in standard feed. And in result feed represents the most favorable method of Dox administration.
Doxycycline (Dox) controlled Tet systems provide a powerful and commonly used method for functional studies on the consequences of gene
overexpression/downregulation. However, whereas Dox delivery in tissue culture in vitro is relatively simple, the situation in vivo is more complex. Several
methods of Dox delivery in vivo have been described-e.g., in drinking water containing alcohol, in drinking water containing various concentrations of
sucrose, and in feed. Unfortunately there are no reports directly comparing the advantages and disadvantages of these diverse methods, and there is no
generally accepted standard. We therefore compared four non-invasive methods of Dox delivery in vivo-in drinking water, by gavage, as a jelly, and in
standard feed. To assess the delivery of Dox by these methods, we used a subcutaneous xenograft model based on colorectal carcinoma cells engineered for
Dox-inducible expression of an activated mutant of c-Src and the luciferase reporter gene. Our results indicate that feed represents the most favorable
method of Dox administration.
Antimicrob Agents Chemother. 2007 May 14;
Cenizal MJ, Skiest D, Luber S, Bedimo R, Davis P, Fox P, Delaney K, Hardy RD.
The University of Texas Southwestern Medical Center, Dallas, TX.
Empiric Therapy with Trimethoprim-Sulfamethoxazole or Doxycycline for Outpatient Skin and Soft Tissue Infections in an Area of High MRSA Prevalence: A Prospective Randomized Trial.
This study was to evaluate empiric therapy with trimethoprim-sulfamethoxazole or doxycycline for outpatient SSTI in an area of high MRSA prevalence and reached the conclusion that there is no significant difference in the clinical failure rate of both therapies.
To evaluate empiric therapy with trimethoprim-sulfamethoxazole or doxycycline for outpatient SSTI in an area of high MRSA prevalence a randomized,
prospective, open-label investigation was performed. The overall clinical failure rate was 9% with all failures occurring in the
trimethoprim-sulfamethoxazole group. However, there was no significant difference in the clinical failure rate of empiric trimethoprim-sulfamethoxazole
compared with doxycycline therapy.
J Dtsch Dermatol Ges. 2006 Oct;4(10):828-41.
Ochsendorf F.
Department of Dermatology and Venereology, Clinic of the J.W. Goethe University, Frankfurt, Germany.
Systemic antibiotic therapy of acne vulgaris.
Inflammatory, medium to severe acne vulgaris is treated with systemic antibiotics worldwide. This data study reported that the systemic antibiotic therapy of widespread papulo-pustular acne not amenable to a topical therapy is effective and well-tolerated.
Background: Inflammatory, medium to severe acne vulgaris is treated with systemic antibiotics worldwide. The rationale is an effect on Propionibacterium acnes as well as the intrinsic anti-inflammatory properties of these antibiotics. Although there are no correlations between the number of P. acnes and the severity of the disease, associations between the degree of humoral and cellular immune responses towards P. acnes and the severity of acne have been reported. Exact data on practical use of these compounds, such as differential efficacy or side effects are unavailable.A summary of currently available studies is presented. Methods: The data of studies of systemic antibiotic therapy of acne vulgaris up to 1975, the summary of literature in English up to 1999, a systematic review of minocycline from 2002 as well as the data of randomized controlled studies published and listed in Medline thereafter were reviewed. Results: Tetracyclines [tetracycline 1 000 mg daily, doxycycline 100 (-200) mg daily, minocycline 100 (-200) mg daily, lymecycline 300 (-600) mg] and erythromycin 1 000 mg daily are significantly more effective than placebo in the systemic treatment of inflammatory acne.The data for tetracycline are best founded. Clindamycin is similarly effective. Co-trimoxazole and trimethoprim are likely to be effective. Clear differences between the tetracyclines or between tetracycline and erythromycin cannot be ascertained. The data for the combination with topical treatments [topical benzoyl peroxide (BPO) or retinoids] suggest synergistic effects.Therefore systemic antibiotics should not be used as monotherapy. In case of similar efficacy, other criteria, such as pharmacokinetics (doxycycline, minocycline, lymecycline have longer half-lives than tetracyclines), the rate of side-effects (tetracycline: side effect-rate approximately 4 % mild side effects; erythromycin: frequent gastrointestinal complaints; minocycline: rare, but potentially severe hypersensitivity reactions; doxycycline: dose-dependent phototoxic reactions), the resistance rate [percentage of resistant bacteria higher with erythromycin ( approximately 50 %) than with tetracycline-therapy ( approximately 20 %)], and the costs of therapy have to be taken into account. Conclusions: The systemic antibiotic therapy of widespread papulo-pustular acne not amenable to a topical therapy is effective and well-tolerated. In general therapy can be carried out for 3 months and should be combined with BPO to prevent resistance.
Med J Aust. 2005 Feb 21;182(4):168-171.
Kitchener SJ, Nasveld PE, Gregory RM, Edstein MD.
Health, Mayne Medical School, Herston Road, Herston, QLD 4006, Australia.
Mefloquine and doxycycline malaria prophylaxis in Australian soldiers in East Timor.
The following study is to describe the tolerability of mefloquine in Australian soldiers for malaria prophylaxis, including a comparison with doxycycline. For this two contingents of Australian soldiers were selected. It reached the conclusion that Mefloquine was generally well tolerated by Australian soldiers and should continue to be used for those intolerant of doxycycline.
OBJECTIVES: To describe the tolerability of mefloquine in Australian soldiers for malaria prophylaxis, including a comparison with doxycycline. DESIGN: Open-label, prospective study and cross-sectional questionnaire and interview. SETTING AND PARTICIPANTS: Two contingents of Australian soldiers, each deployed to East Timor for peacekeeping duties over a 6-month period (April 2001-October 2001 and October 2001-May 2002). OUTCOME MEASURES: Withdrawals during the study; adverse events relating to mefloquine prophylaxis; willingness to use mefloquine again on deployment. RESULTS: Of 1157 soldiers starting on mefloquine, 75 (6.5%) withdrew because of adverse responses to the drug. There were three serious adverse events of a neuropsychiatric nature, possibly relating to mefloquine. Fifty-seven per cent of soldiers using mefloquine prophylaxis reported at least one adverse event, compared with 56% using doxycycline. The most commonly reported adverse effects of both drugs were sleep disturbance, headache, tiredness and nausea. Of the 968 soldiers still taking mefloquine at the end of their deployments, 94% indicated they would use mefloquine again. Of 388 soldiers taking doxycycline prophylaxis who were deployed with the first mefloquine study contingent, 89% indicated they would use doxycycline again. CONCLUSIONS: Mefloquine was generally well tolerated by Australian soldiers and should continue to be used for those intolerant of doxycycline.
J Periodontol. 2004 Dec;75(12):1600-4.
Machion L, Andia DC, Saito D, Klein MI, Goncalves RB, Casati MZ, Nociti FH Jr, Sallum EA.
Department of Periodontics and Prosthodontics, School of Dentistry at Piracicaba (UNICAMP), Sao Paulo, Brazil.
Microbiological changes with the use of locally delivered doxycycline in the periodontal treatment of smokers.
This study was to evaluate the effect of the association of locally delivered doxycycline 10% and scaling and root planing in the subgingival plaque of smokers and selected 16 smokers with chronic periodontitis for this. And reached the conclusion that the use of locally delivered doxycycline may promote the elimination of T. forsythensis and P. gingivalis in a greater proportion compared to conventional scaling and root planing in smokers.
BACKGROUND: The aim of this study was to evaluate the effect of the association of locally delivered doxycycline 10% and scaling and root planing in the subgingival plaque of smokers. METHODS: Sixteen smokers with chronic periodontitis and a minimum of four pockets (> or = 5 mm) on anterior teeth that bled on probing were selected. Patients were randomly assigned to one of the following groups: scaling and root planing (SRP) or scaling and root planing followed by local application of doxycycline (SRP-D). Subgingival plaque samples were collected from initially moderate (5 to 6 mm) and deep (> or = 7 mm) pockets at baseline and 3 months. Polymerase chain reaction (PCR) analysis was used to detect the frequency of Actinobacillus actinomycetemcomitans (Aa), Porphyromonas gingivalis (Pg), and Tannerella forsythensis (Tf). RESULTS: No statistically significant difference was found in the reduction of Aa in either the SRP-D or SRP group (P > 0.05). The reduction in Tf, Pg, and Tf + Pg was statistically significant for SRP-D only (P = 0.016, 0.027, and 0.027, respectively). The proportion of sites free of Tf at 3 months was 53% for SRP-D and 9% for SRP (P = 0.02). For Pg, this proportion was 82% and 40%, respectively (P = 0.05). CONCLUSION: The use of locally delivered doxycycline may promote the elimination of T. forsythensis and P. gingivalis in a greater proportion of sites compared to conventional scaling and root planing in smokers.
Arch Dermatol. 2003 Apr;139(4):459-64.
Skidmore R, Kovach R, Walker C, Thomas J, Bradshaw M, Leyden J, Powala C, Ashley R.
Department of Medicine, Division of Dermatology, University of Florida, Gainesville, 32608, USA.
Effects of subantimicrobial-dose doxycycline in the treatment of moderate acne.
This study was to determine if treatment with subantimicrobial-dose (SD) doxycycline hyclate improved clinical outcome and used 51 adults with moderate facial acne. The results explained that twice-daily SD doxycycline treatment significantly reduced the number of inflammatory and noninflammatory lesions in patients with moderate facial acne, was well tolerated, had no detectable antimicrobial effect on the skin flora.
OBJECTIVE: To determine if treatment with subantimicrobial-dose (SD) doxycycline hyclate (20-mg tablets taken twice daily) improved clinical outcome, had any detectable effect on skin flora, led to overgrowth or colonization of skin by opportunistic pathogens, or resulted in an increase in antibiotic resistance by the surface skin microflora in patients with moderate acne compared with placebo. DESIGN: Multicenter, double-blind, randomized, placebo-controlled, parallel-group trial. SETTING: Two university-based clinics. SUBJECTS: Adults (N = 51) with moderate facial acne. INTERVENTIONS: Patients were randomized to receive SD doxycycline (Periostat; CollaGenex Pharmaceuticals Inc, Newtown, Pa) or placebo twice daily for 6 months. MAIN EFFICACY OUTCOMES: Primary: changes from baseline in numbers of inflammatory, noninflammatory, and total lesions. Secondary: changes from baseline of individual counts of papules, pustules, and nodules and global assessments of clinical improvement by patient and physician. RESULTS: Forty patients completed 6 months of treatment. At 6 months, the SD doxycycline group had a significantly greater percent reduction in the number of comedones (P<.01), inflammatory and noninflammatory lesions combined (P<.01), and total inflammatory lesions (P<.05) than did the placebo group. They also had significantly greater improvement according to the clinician's global assessment (P =.03). There were no significant differences in microbial counts between groups and no evidence of change in antibiotic susceptibility or colonization by potential pathogens. The treatment was well tolerated. CONCLUSIONS: Twice-daily SD doxycycline treatment significantly reduced the number of inflammatory and noninflammatory lesions in patients with moderate facial acne, was well tolerated, had no detectable antimicrobial effect on the skin flora, and did not result in any increase in the number or severity of resistant organisms.
Microbes Infect. 2003 Apr;5(4):261-73.
Hoerauf A, Mand S, Volkmann L, Buttner M, Marfo-Debrekyei Y, Taylor M, Adjei O, Buttner DW.
Department of Helminthology, Bernhard Nocht Institute for Tropical Medicine, Bernhard-Nocht-Strasse 74, 20359 Hamburg, Germany.
Doxycycline in the treatment of human onchocerciasis: Kinetics of Wolbachia endobacteria reduction and of inhibition of embryogenesis in female Onchocerca worms.
Experts have warned that mass treatment with ivermectin alone may not interrupt the transmission of Onchocerca. Therefore additional drugs are needed. Due to its long-lasting inhibition of embryogenesis, doxycycline presents an additional strategy for the treatment of onchocerciasis and control of Onchocerca microfilariae transmission.
Recently, experts have warned that mass treatment with ivermectin alone may not interrupt the transmission of Onchocerca. Hence, additional drugs are needed, such as antibiotics acting on symbiotic endobacteria of the filariae, the causative agents of onchocerciasis. Based on animal experiments, human onchocerciasis was treated with doxycycline, and preliminary observations published in 2001 in The Lancet showed sterility in female worms by depletion and marked reduction in symbiotic Wolbachia endobacteria from the filariae. Here, a detailed kinetic analysis of the features of the worms, following administration or not of doxycycline to the patients is reported. Sixty-three onchocerciasis patients in Ghana were treated with 100 mg doxycycline daily for 6 weeks and 2 or 6 months later with ivermectin. Onchocercomas were extirpated 2, 6, 11 and 18 months after the onset of treatment and the filariae were examined by immunohistology and PCR. The analysis showed: (i) progressive depletion of Wolbachia from adult worms and microfilariae by doxycycline over a period of 6 months; (ii) inhibition of embryogenesis by doxycycline after 6 months with respect to all embryo stages followed by decline in microfilariae after 11 months; (iii) reduction in spermatozoa in the female genital tract by doxycycline, whereas spermiogenesis was only partly reduced after 11 and 18 months; (iv) no relevant macro- or microfilaricidal activity; (v) depletion/marked reduction in endobacteria and inhibition of embryogenesis were sustained until 18 months after doxycycline and 12 months after co-administration of ivermectin; (vi) no severe adverse side effects were seen. Due to its long-lasting inhibition of embryogenesis, doxycycline presents an additional strategy for the treatment of onchocerciasis and control of Onchocerca microfilariae transmission. Extension of the existing registration will not require much time or high cost. Treatment of individual patients can be considered immediately.
Ann Dermatol Venereol. 2002 Jun-Jul;129(6-7):874-82.
Bonnetblanc JM.
Service de Dermatologie, CHRU Dupuytren, 2, avenue Martin Luther King, 87042 Limoges Cedex.
Doxycycline
Doxycyclin is a semi-synthetic structural isomer of the tetracycline family. It exhibits good intra-cellular penetration, with bacteriostatic activity on many bacteria. Different types or bacterial resistance are known. Acquired resistance has a ribosomal or a plasmidic mechanism. Resistance of Propionibacterium acnes is secondary to a mutation of ARNr. Doxycyclin also has an anti-inflammatory activity, via numerous pathways. Doxycyclin is rapidly and almost completely absorbed by the digestive tract. Food has no incidence on the absorption. It has a high but labile affinity for proteins with 90 p. 100 of the molecule linked. It rapidly diffuses in the extravascular compartment and in most of the tissues. Bile excretion is the main excretion route. It occurs more slowly by the kidney with tubular reabsorption. The main dermatological indication is acne with daily dose varing between 50 mg and 100 mg. Although good assays are lacking, a large professional consensus has validated its use. It is also active at the same dosage in rosacea. Chlamydial and mycoplasma urethritis may be treated by doxycyclin, and this antibiotic is presently used as second choice. Many other diseases may be treated as a primary or secondary choice, such as treponematoses, brucellosis, pasteurellosis, borreliosis, rickettsioses and cholera. Some non infectious diseases have been occasionally treated by doxycycline. Digestive side effects are the more frequent. Esophageal toxicity has been reduced with tablets and sufficient concomitant water ingestion. Phototoxicity is dose-dependent. Various cutaneous side effects have been described, some of them severe. Systemic toxicity is rare. Pregnancy is a contra-indication, and as other tetracyclines, it should not be given to children and during lactation. Doxycycline is commercialized as tablets. No reduction of the dose is necessary in renal failure. Association with retinoids is not recommended. Anticoagulants are potentialized. Didanosin, iron, and mineral salts lower its activity.
J Dermatolog Treat. 2002 Sep;13(3):143-6.
Amato L, Coronella G, Berti S, Gallerani I, Moretti S, Fabbri P.
Department of Dermatological Sciences, University of Florence, Italy.
Successful treatment with doxycycline and nicotinamide of two cases of persistent pemphigoid gestationis.
Pemphigoid gestationis (PG) is a rare dermal-epidermal autoimmune bullous disease of pregnancy and postpartum, which relapses more seriously and earlier during following pregnancies. PG also occurs in association with trophoblastic tumours or oral contraceptive treatment. The term 'persistent PG' represents the cases where active disease persists for months to many years after delivery. Four cases of persistent PG have been reported to date in the literature. So far, systemic cortico-steroids have been the main PG therapy and the use of cyclophosphamide, dapsone, pyridoxine, methotrexate, plasmapheresis or ritodrine has also been reported, with contradictory results. In this paper are described two patients with persistent PG who were successfully treated with doxycycline (200 mg/day) and nicotinamide (500 mg/day), a treatment that was demonstrated to be safe and efficacious in bullous pemphigoid.
Cancer Res. 2002 Mar 15;62(6):1588-91.
Duivenvoorden WC, Popovic SV, Lhotak S, Seidlitz E, Hirte HW, Tozer RG, Singh G.
Hamilton Regional Cancer Centre and McMaster University, Hamilton, Ontario, L8V 5C2 Canada.
Doxycycline decreases tumor burden in a bone metastasis model of human breast cancer.
Bone is one of the most frequent sites for metastasis in breast cancer patients,often resulting in significant clinical morbidity and mortality. Increased matrix metalloproteinase (MMP) activity of tumor cells correlates with a higher invasive and metastatic potential. Members of the tetracycline family of antibiotics, including doxycycline, have potential treatment value for bone metastasis; they inhibit cancer cell proliferation, and they are also potent MMP inhibitors and are highly osteotropic. Doxycycline treatment in an experimental bone metastasis mouse model of human breast cancer MDA-MB-231 cells resulted in a 70% reduction in total tumor burden when compared with placebo control animals. In tumor-bearing animals, the amount of doxycycline incorporated into the radius/ulna as assessed by ELISA was lower than in non-tumor-bearing animals. In doxycycline-treated mice, bone formation was significantly enhanced as determined by increased numbers of osteoblasts, osteoid surface, and volume, whereas a decrease in bone resorption was also observed. Doxycycline treatment may be beneficial for breast cancer patients with or at risk for osteolytic bone metastasis; it greatly reduces tumor burden and could also compensate for the increased bone resorption associated with the disease.
Ann Rheum Dis. 2001 Dec;60(12):1088-94.
Smieja M, MacPherson DW, Kean W, Schmuck ML, Goldsmith CH, Buchanan W, Hart LE, Mahony JB.
Department of Pathology and Molecular Medicine, McMaster University, Hamilton, ON, Canada.
Randomised, blinded, placebo controlled trial of doxycycline for chronic seronegative arthritis.
OBJECTIVE: To determine whether long term doxycycline improves symptoms in patients with chronic seronegative or reactive arthritis. METHODS: A randomised, triple blind, controlled clinical trial of three months' treatment with doxycycline or placebo of patients with chronic reactive or seronegative arthritis was conducted. The primary study end points were three month pain and functional status measured by a self administered Arthritis Impact Measurement Scales version 2 (AIMS2) quality of life questionnaire. Secondary end points were pain and functional status at 6-12 months, three month rheumatologist assessed joint count, pain, and arthritis activity, and treatment efficacy in those with previous exposure to chlamydia. RESULTS: Of 60 patients randomly allocated to receive doxycycline or placebo, results from 37 were evaluable at three months. Groups were well balanced for major prognostic variables. Doxycycline had no detectable effect at three months on pain change scores (mean difference 1.5, 95% CI -1.2 to 4.2, p=0.25) or composite functional change scores (mean difference 0.8, 95% CI -5.6 to 7.1, p=0.81). Furthermore, there were no differences in secondary study end points, and no apparent treatment effect in patients with previous chlamydia infection. CONCLUSION: Three months' treatment with doxycycline did not improve pain or functional status in patients with chronic reactive or seronegative arthritis.
N Engl J Med. 2001 Jul 12;345(2):79-84.
Nadelman RB, Nowakowski J, Fish D, Falco RC, Freeman K, McKenna D, Welch P, Marcus R, Aguero-Rosenfeld ME, Dennis DT, Wormser GP; Tick Bite Study Group.
Department of Medicine, New York Medical College, Valhalla 10595, USA.
Prophylaxis with single-dose doxycycline for the prevention of Lyme disease after an Ixodes scapularis tick bite.
BACKGROUND: It is unclear whether antimicrobial treatment after an Ixodes scapularis tick bite will prevent Lyme disease. METHODS: In an area of New York where Lyme disease is hyperendemic we conducted a randomized, double-blind, placebo-controlled trial of treatment with a single 200-mg dose of doxycycline in 482 subjects who had removed attached I. scapularis ticks from their bodies within the previous 72 hours. At base line, three weeks, and six weeks, subjects were interviewed and examined, and serum antibody tests were performed, along with blood cultures for Borrelia burgdorferi. Entomologists confirmed the species of the ticks and classified them according to sex, stage, and degree of engorgement. RESULTS: Erythema migrans developed at the site of the tick bite in a significantly smaller proportion of the subjects in the doxycycline group than of those in the placebo group (1 of 235 subjects [0.4 percent] vs. 8 of 247 subjects [3.2 percent], P<0.04). The efficacy of treatment was 87 percent (95 percent confidence interval, 25 to 98 percent). Objective extracutaneous signs of Lyme disease did not develop in any subject, and there were no asymptomatic seroconversions. Treatment with doxycycline was associated with more frequent adverse effects (in 30.1 percent of subjects, as compared with 11.1 percent of those assigned to placebo; P<0.001), primarily nausea (15.4 percent vs. 2.6 percent) and vomiting (5.8 percent vs. 1.3 percent). Erythema migrans developed more frequently after untreated bites from nymphal ticks than after bites from adult female ticks (8 of 142 bites [5.6 percent] vs. 0 of 97 bites [0 percent], P=0.02) and particularly after bites from nymphal ticks that were at least partially engorged with blood (8 of 81 bites [9.9 percent], as compared with 0 of 59 bites from unfed, or flat, nymphal ticks [0 percent]; P=0.02). CONCLUSIONS: A single 200-mg dose of doxycycline given within 72 hours after an I. scapularis tick bite can prevent the development of Lyme disease.
Article from CNN
October 28, 2001 Posted: 12:32 PM EST (1732 GMT)
WASHINGTON (CNN)
Doxycycline becomes anthrax drug of choice in Washington
Washington health officials said they'll be giving people who need preventive treatment against anthrax the antibiotic doxycycline, rather than ciprofloxacin, known by the brand name Cipro. "We'll be treating them with 60 days of doxycycline, which is what the CDC [Centers for Disease Control and Prevention] is now recommending because we are fortunate to have a very sensitive organism," said Dr. Gregory Martin, an infectious disease specialist at Bethesda Naval Medical Center in Maryland. More than 10,000 people in the Washington area are now on Cipro. Authorities initially prescribed ciprofloxacin but now are prescribing doxycycline because the anthrax strain seen so far is sensitive to a wide range of antibiotics, and they said they wanted to bolster the public's confidence in other drugs. "We have not put this many people on this number of concentrated antibiotics, if not ever, in certainly a long period of time," Dr. Ivan Walks, Washington's chief health officer, told CNN on Sunday. The CDC has said almost from the beginning of the anthrax crisis that other antibiotics can be used for anthrax -- the switch now is aimed at achieving a better balance in the types of antibiotics used. Using a single antibiotic for extended periods of time can increase the likelihood of antibiotic resistance. Cipro still will be used in the fight against anthrax. The CDC said that side effects common to both ciprofloxacin and doxycycline include nausea, vomiting, diarrhea and sensitivity to the sun. Other ciprofloxacin side effects include headaches, dizziness or sun rash and may be accentuated by caffeine or theophylline-containing medications. Other adverse side effects associated with doxycycline include dark "furry" tongue, black tongue or swollen tongue, or vaginal yeast infection. Serious side effects could include an allergic reaction, severe headaches, changes in vision, confusion, liver damage, blood problems or genital sores or itching. The Supreme Court justices began a 10-day doxycycline prophylactic treatment Friday, Walks said, after anthrax spores were found in an off-site mail room that serves the nation's highest court. The Washington health officials' endorsement of doxycycline may increase its use and give the public more confidence in the drug. Walks also said that cost is not a factor since both drugs are "in the national stockpile."
Med Klin. 2000 Nov 15;95(11):629-31.
Ziegler T, Winkler C, Wege K, Schmechel H.
Klinik fur Innere Medizin I, Sophien- und Hufeland-Klinikum Weimar.
Doxycycline--the forgotten antibiotic.
BACKGROUND: Doxycycline is an broad-spectrum antimicrobial agent, it remains an inexpensive alternative for the treatment of community-acquired respiratory infections and urinary tract infections. Despite these clinical data the use of doxycycline has decreased during the last years. PHARMACOLOGY: Adverse effects and resistance to therapy are infrequent and not different to fluoroquinolones and macrolide antibiotics. Gastrointestinal and phototoxic side effects are of importance. After oral administration 75% will be absorbed and largely eliminated by the hepatic and intestinal way. Contraindications are severe liver dysfunction and treatment in childhood. CLINICAL INDICATIONS: Bacterial resistance to doxycycline has a low incidence in Germany. A therapeutic success can be expected in respiratory and urinary tract infections in about 80%. Doxycycline is the drug of choice for treating infections caused by Rickettsia, Borrelia, Ehrlichia. It shows good activity against Plasmodium falciparum as one part in a combination therapy. Daily costs of therapy are low, in oral administration DM 0.80 per day, in i.v. administration DM 22,-per day. CONCLUSION: Despite competition from new antibiotics, doxycycline can retain an important place in the treatment of many infectious diseases.
Pediatr Infect Dis J. 2000 Sep;19(9):871-4.
Purvis JJ, Edwards MS.
Division of Allied Health Sciences, Baylor College of Medicine, Houston, TX 77030, USA.
Doxycycline use for rickettsial disease in pediatric patients.
BACKGROUND: Recent evidence suggests that despite potential side effects, doxycycline should be considered the drug of choice for children of all ages in whom a rickettsial disease is considered in the differential diagnosis of the illness. We hypothesized that doxycycline would be used infrequently for the treatment of suspected rickettsial disease. The objective of the investigation was to determine the initial antibiotic administered to children for whom rickettsial infection was considered likely. METHODS: The study population consisted of 35 children evaluated at Texas Children's Hospital between 1987 and 1999 in whom rickettsial disease was a diagnostic consideration. Demographic information and clinical manifestations were assessed through a retrospective chart review. RESULTS: Thirty children (86%) presented with fever, 21 (60%) with rash and 14 (40%) with headache, which are typical presenting symptoms for rickettsial diseases. Only 1 of 35 children (3%) was prescribed a tetracycline class antibiotic as initial empiric therapy. Eleven (31%) children received doxycycline during the hospital course. A total of 19 patients, or 54%, received an antimicrobial known to have efficacy in the treatment of rickettsial infection, usually at the suggestion of an infectious diseases consultant. CONCLUSIONS: Even among children for whom rickettsial infection is a diagnostic consideration, doxycycline is not prescribed with the frequency that is indicated. Pediatric caregivers should have heightened awareness regarding the appropriate indications for doxycycline use in childhood.
Adv Dent Res. 1998 Nov;12(2):51-5.
Israel HA, Ramamurthy NS, Greenwald R, Golub L.
Columbia University, New York, New York, USA.
The potential role of doxycycline in the treatment of osteoarthritis of the temporomandibular joint.
Collagenase and gelatinase are matrix metalloproteinases (MMPs) which play an important role in tissue destruction in arthritic joints. Studies have demonstrated that tetracyclines can inhibit MMPs and prevent tissue destruction independent of their antimicrobial activity. The purpose of this pilot study is to assess the potential therapeutic role of Doxycycline in patients with advanced osteoarthritis of the temporomandibular joint (TMJ). This ongoing investigation includes patients with a diagnosis of osteoarthritis of the TMJ based on clinical and diagnostic imaging findings, symptoms (localized TMJ pain, limited mobility, dysfunction) for a minimum of 36 months, and failure of previous non-surgical and surgical modalities to alleviate the symptoms. A synovial fluid sample is collected by a saline injection and aspiration technique, followed by diagnostic arthroscopy. Patients are placed on Doxycycline 50 mg BID for three months and then undergo repeat diagnostic arthroscopy and synovial fluid collection. The samples are stored at -80 degrees C. Collagenase activity is determined by a combination of SDS-polyacrylamide gel electrophoresis and fluorography and calculated based on the percentage of collagen alpha chains that are degraded into alphaA breakdown products. Three patients have completed the three-month course of Doxycycline thus far, and 5 joints with osteoarthritis have been analyzed. All patients were female (mean age = 35, mean duration of symptoms = 132 months) and had undergone previous bilateral arthroscopies. One patient had undergone unilateral arthroplasty. The mean collagenase activity showed 55% collagen lysis prior to Doxycycline treatment and 19% after three months of therapy. The mean gelatinase activity was 28% prior to Doxycycline treatment and 7% after three months of therapy. The mean interincisal opening was 33 mm initially and 41 mm after three months of Doxycycline. Subjectively, two of the three patients reported significant improvement in their overall symptoms, which they had not experienced over the previous three years. One patient did not experience any change in symptoms, in spite of a marked reduction in collagenase activity from 86.4% to 9.6%. Because of the very small numbers of patients enrolled in this pilot study so far, no statistically significant differences could be appreciated. However, the dramatic reduction in collagenase activity in these patients, with a long history of TMJ symptoms from osteoarthritis, suggests the potential promising role of Doxycycline in the management of osteoarthritis, and further investigation is warranted.
Cancer Lett. 1998 May 15;127(1-2):37-41.
Fife RS, Sledge GW Jr, Roth BJ, Proctor C.
Department of Medicine, Indiana University School of Medicine, Indianapolis, USA.
Effects of doxycycline on human prostate cancer cells in vitro.
Prostate cancer is the most common form of cancer in older men and the major cause of death from prostate cancer is metastatic disease. The matrix metalloproteinases (MMPs) play a significant role in the growth, invasion and metastasis of many tumors, including those of the prostate. We previously demonstrated that doxycycline, a synthetic tetracycline, inhibits MMPs and cell proliferation and induces apoptosis in several cancer cell lines. We also demonstrated that in an in vivo model of metastatic breast cancer in athymic mice doxycycline inhibits tumor size and regrowth after resection. In the present study, gelatinolytic activity in the human prostate cancer cell line, LNCaP, was suppressed and significant inhibition of cell growth occurred after exposure to 5 or 10 microg/ml of doxycycline, while cell growth was normal in untreated cells. Radioisotope incorporation into proteins was reduced by doxycycline. DNA fragmentation, consistent with apoptosis, was demonstrated in cells treated with doxycycline. These data suggest that doxycycline may have potential utility in the management of prostate cancer.
J Antimicrob Chemother. 1998 Jan;41(1):85-92.
Sinisalo J, Mattila K, Nieminen MS, Valtonen V, Syrjala M, Sundberg S, Saikku P.
Department of Medicine, Helsinki University Central Hospital, Finland.
The effect of prolonged doxycycline therapy on Chlamydia pneumoniae serological markers, coronary heart disease risk factors and forearm basal nitric oxide production.
Chronic Chlamydia pneumoniae infection, characterized by elevated levels of C. pneumoniae IgG and IgA antibodies and immunocomplexes, is associated with myocardial infarction and angiographically verified coronary heart disease. C. pneumoniae organisms have also been found in coronary atheromas, but not in healthy vessels. We investigated the effect of 4 months' doxycycline therapy on serological markers of C. pneumoniae infection and coronary risk factors. Thirty-four non-smoking men, aged 57.9 (+/- 5.2) years, who had mild hypertension or moderate hypercholesterolaemia and a previous coronary bypass, were randomly assigned to receive doxycycline or matching placebo for 4 months. Acetylsalicylic acid and beta-blocker were the only other medications allowed. Patients were examined physically and by laboratory tests; their basal nitric oxide production was determined by blood flow responses to intra-arterial monomethyl-L-arginine at baseline and at 2 and 4 months. The tests were also taken at 6 months after medication. At entry, the demographic, clinical, blood flow and laboratory measurements were similar in both groups, with the exception of fibrinogen and triglyceride levels, which were higher in the placebo group. No significant changes were found in any of the parameters during the treatment. Thus extended doxycycline therapy did not affect C. pneumoniae antibodies or coronary heart disease risk factors. We conclude that doxycycline monotherapy may not be sufficient to eradicate chronic C. pneumoniae infection.
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 Doxycycline scientific update
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