Zinc (Zn) scientific update |
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Med Hypotheses. 2008 Aug 14.
Guo W, Zhao YP, Jiang YG, Wang RW, Ma Z.
Department of Thoracic Surgery, Institute of Surgery Research, Daping Hospital, Third Military Medical University, Chongqing 400042, PR China.
Restoring the metabolic disturbance of zinc: May not only contribute to the prevention of esophageal squamous cell cancer.
The relationship between zinc deficiency (ZD) and esophageal squamous cell cancer (ESCC) is well-established. Zinc supplement has long been considered as potential strategy for prevention of ESCC. However, the effect of zinc replenishment on prevention of ESCC is still in controversy and no convincing evidence to support these proposals has become known. We hypothesized that zinc deficiency might be the major initiator for dysfunction of numerous genes and subsequent carcinogenesis of esophagus, and replenishment of zinc might improve the prognosis of patients with ESCC.
J Enzyme Inhib Med Chem. 2008 Aug 7:1.
Kovala-Demertzi D, Hadjipavlou-Litina D, Staninska M, Primikiri A, Kotoglou C, Demertzis MA.
Inorganic and Analytical Chemistry, Department of Chemistry, University of Ioannina, Ioannina, Greece.
Anti-oxidant, in vitro, in vivo anti-inflammatory activity and antiproliferative activity of mefenamic acid and its metal complexes with manganese(II), cobalt(II), nickel(II), copper(II) and zinc(II).
Some new complexes of mefenamic acid with potentially interesting biological activity are described. The complexes of mefenamic acid [Mn(mef)(2)(H(2)O)(2)], 1, [Co(mef)(2)(H(2)O)(2)], 2, [Ni(mef)(2)(H(2)O)(2)], 3, [Cu(mef)(2)(H(2)O)](2), 4 and [Zn(mef)(2)], 5, were prepared by the reaction of mefenamic acid, a potent anti-inflammatory drug with metal salts. Optical and infrared spectral data of these new complexes are reported. Monomeric six-coordinated species were isolated in the solid state for Mn(II), Ni(II) and Co(II), dimeric five-coordinated for Cu(II) and monomeric four-coordinated for Zn(II). In DMF or CHCl(3) solution the coordination number is retained and the coordinated molecules of water are replaced by solvent molecules. The anti-oxidant properties of the complexes were evaluated using the 1,1-diphenyl-2-picrylhydrazyl, DPPH, free radical scavenging assay. The scavenging activities of the complexes were measured and compared with those of the free drug and vitamin C. We have explored their ability to inhibit soybean lipoxygenase, beta-glucuronidase and trypsin- induced proteolysis. The complex [Mn(mef)(2)(H(2)O)(2)] exhibits the highest antioxidant activity and the highest inhibitory effect against the soybean lipogygenase (LOX), properties that are not demonstrated by mefenamic acid. Their inhibitory effects on rat paw edema induced by Carrageenan was studied and compared with those of mefenamic acid. The complex [Zn(mef)(2)] exhibited a strong inhibitory effect at 0.1 mmol/Kg B.W. (81.5 +/- 1.3% inhibition), superior to the inhibition induced by mefenamic acid at the same dose (61.5 +/- 2.3% inhibition). Mefenamic acid and its metal complexes have been evaluated for antiproliferative activity in vitro against the cells of three human cancer cell lines: MCF-7 (human breast cancer cell line), T24 (bladder cancer cell line), A-549 (non-small cell lung carcinoma) and a mouse fibroblast L-929 cell line. The copper(II) complex displays against T24, MCF-7 and L-929 cancer cell lines, IC(50) values in a muM range similar to that of the antitumor drug cis-platin and they are considered for further stages of screening in vitro and/or in vivo as agents with potential antitumor activity.
Rev Belge Med Dent. 2008;63(2):69-76.
Chédid JC, Pilipili C.
Département de Dentisterie Communautaire et Pédiatrique, Faculté de Médecine Dentaire, Université Saint Joseph, Beyrouth, Liban.
[A 24 month evaluation of zinc oxide pulpotomy on primary canines] [Article in French]
Pulpotomy is the most performed and controversial therapeutic in pediatric dentistry. Since formocresol is known to have a toxic effect on living tissues, plus a mutagenic and carcinogenic potential with a systemic uptake of formocresol via pulpotomized teeth, other alternative products have been investigated. Twenty-five decayed primary canines and twenty-five healthy primary canines necessitating disking for orthodontic purposes were pulpotomized using non modified Zinc Oxide Eugenol. The effects of this material were evaluated both clinically and radiographically. Post operative control examinations were performed at 1, 6, 12, and 24 months trying to detect spontaneous or stimulated pain, pathological tooth mobility, abscesses or fistulas, internal or external pathological tooth resorption, periapical bone destruction, or canal obliteration. Pain was absent at 24 months post operatively. Half of the treated canines presented with a mobility, while internal and external resorptions were more frequent in decayed teeth and their number increased with time. On the other hand, abscesses and fistulas were equally found in both treated groups. The observations were compared to others related to formocresol ferric sulfate, MTA, and laser pulpotomies, using the binominal law, or the comparative test of an observed proportion to a reference proportion. In this study, and based on the excessive negative results in both groups, we demonstrated that non fixative pulpotomies on temporary canines were not a promising technique.
J Mater Sci Mater Med. 2008 Aug 21.
Nair S, Sasidharan A, Divya Rani VV, Menon D, Nair S, Manzoor K, Raina S.
Amrita Center for Nanosciences, Amrita Vishwa Vidyapeetham, Kochi, 682 026, Kerala, India.
Role of size scale of ZnO nanoparticles and microparticles on toxicity toward bacteria and osteoblast cancer cells.
The specific role of size scale, surface capping, and aspect ratio of zinc oxide (ZnO) particles on toxicity toward prokaryotic and eukaryotic cells was investigated. ZnO nano and microparticles of controlled size and morphology were synthesized by wet chemical methods. Cytotoxicity toward mammalian cells was studied using a human osteoblast cancer cell line and antibacterial activity using Gram-negative bacteria (Escherichia coli) as well as using Gram-positive bacteria (Staphylococcus aureus). Scanning electron microscopy (SEM) was conducted to characterize any visual features of the biocidal action of ZnO. We observed that antibacterial activity increased with reduction in particle size. Toxicity toward the human cancer cell line was considerably higher than previously observed by other researchers on the corresponding primary cells, suggesting selective toxicity of the ZnO to cancer cells. Surface capping was also found to profoundly influence the toxicity of ZnO nanoparticles toward the cancer cell line, with the toxicity of starch-capped ZnO being the lowest. Our results are found to be consistent with a membrane-related mechanism for nanoparticle toxicity toward microbes.
Zinc (Zn) description...
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Drug category:Antioxidants and Vitamines
 Zinc (Zn) scientific update
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