{"title":"Acetylcholinesterase from Human Erythrocytes as a Surrogate Biomarker of Lead Induced Neurotoxicity.","authors":"Vivek Kumar Gupta, Rajnish Pal, Nikhat Jamal Siddiqi, Bechan Sharma","doi":"10.1155/2015/370705","DOIUrl":null,"url":null,"abstract":"<p><p>Lead induced neurotoxicity in the people engaged in different occupations has received wide attention but very little studies have been carried out to monitor occupational neurotoxicity directly due to lead exposure using biochemical methods. In the present paper an endeavour has been made in order to assess the lead mediated neurotoxicity by in vitro assay of the activity of acetylcholinesterase (AChE) from human erythrocytes in presence of different concentrations of lead. The results suggested that the activity of this enzyme was localized in membrane bound fraction and it was found to be highly stable up to 30 days when stored at -20°C in phosphate buffer (50 mM, pH 7.4) containing 0.2% Triton X-100. The erythrocyte's AChE exhibited K m for acetylcholinesterase to be 0.1 mM. Lead caused sharp inhibition of the enzyme and its IC50 value was computed to be 1.34 mM. The inhibition of the enzyme by lead was found to be of uncompetitive type (K i value, 3.6 mM) which negatively influenced both the V max and the enzyme-substrate binding affinity. Taken together, these results indicate that AChE from human erythrocytes could be exploited as a surrogate biomarker of lead induced neurotoxicity particularly in the people occupationally exposed to lead. </p>","PeriodicalId":15421,"journal":{"name":"Journal of Coordination Chemistry","volume":"42 1","pages":"370705"},"PeriodicalIF":2.2000,"publicationDate":"2015-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4633554/pdf/","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Coordination Chemistry","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1155/2015/370705","RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"2015/10/22 0:00:00","PubModel":"Epub","JCR":"Q3","JCRName":"CHEMISTRY, INORGANIC & NUCLEAR","Score":null,"Total":0}
引用次数: 0
Abstract
Lead induced neurotoxicity in the people engaged in different occupations has received wide attention but very little studies have been carried out to monitor occupational neurotoxicity directly due to lead exposure using biochemical methods. In the present paper an endeavour has been made in order to assess the lead mediated neurotoxicity by in vitro assay of the activity of acetylcholinesterase (AChE) from human erythrocytes in presence of different concentrations of lead. The results suggested that the activity of this enzyme was localized in membrane bound fraction and it was found to be highly stable up to 30 days when stored at -20°C in phosphate buffer (50 mM, pH 7.4) containing 0.2% Triton X-100. The erythrocyte's AChE exhibited K m for acetylcholinesterase to be 0.1 mM. Lead caused sharp inhibition of the enzyme and its IC50 value was computed to be 1.34 mM. The inhibition of the enzyme by lead was found to be of uncompetitive type (K i value, 3.6 mM) which negatively influenced both the V max and the enzyme-substrate binding affinity. Taken together, these results indicate that AChE from human erythrocytes could be exploited as a surrogate biomarker of lead induced neurotoxicity particularly in the people occupationally exposed to lead.
期刊介绍:
The Journal of Coordination Chemistry publishes the results of original investigations of coordination complexes, loosely defined as the interactions of organic or inorganic ligands with metal centres. Original investigations may involve syntheses, structures, physical and chemical properties, kinetics and mechanisms of reactions, calculations and applications of coordination compounds. The applications may involve bioinorganic, organometallic, catalytic, solid state/materials, coordination chemistry of nanostructured surfaces and medicinal studies.
The Journal publishes original manuscripts, communications and reviews. Original manuscripts are expected to provide a clear contribution to the advance of coordination chemistry. Communications are short manuscripts with an urgency that requires rapid publication. Reviews are welcome in all areas of coordination chemistry and may focus on the metal, ligand or applications. Reviews of emerging areas of coordination chemistry should be developed fully from the basics, carefully relating the topic to the field in general. Reviews of well established subjects should collect developments from the literature and take a critical view of recent work.