title: Inhibitory effect of quercetin in the formation of advance glycation end products of human serum albumin: An in vitro and molecular interaction study.
abstract: Non-enzymatic glycation entails the reaction between the carbonyl group of a sugar with the amino group of a protein giving rise to Schiff base and Amadori products. The formation of advanced glycation end products (AGEs) leads to the generation of free radicals, which play an important role in the pathophysiology of ageing and diabetes. Bioavailable dietary antioxidants like quercetin (QC) are thought to inhibit AGEs formation. This study was aimed to investigate the effect of quercetin on AGE formation and features the glycation of human serum albumin (HSA) and its characterization by various spectroscopic techniques. The effect of quercetin, against the formation of AGEs was studied using a glycated human serum albumin product, haemoglobin-δ-gluconolactone, and aminoguanidine. The results were then corroborated with estimation of protein oxidation, lipid peroxidation and comet assay. On the basis of the experimental data, computational docking studies were then performed to understand the location of the site of quercetin binding and its best bound conformation with respect to human serum albumin. Through this study we have demonstrated the mechanism of formation of AGE and its inhibition by quercetin. We have also suggested that the supplementation with dietary antioxidants like quercetin might protect against free radical toxicity.
authors.affiliation: Department of Biochemistry, Faculty of Life Sciences, Aligarh Muslim University Aligarh, India.
authors.forename: Md Maroof
authors.initials: MM
authors.lastname: Alam
authors.affiliation: Department of Biochemistry, Faculty of Life Sciences, Aligarh Muslim University Aligarh, India.
authors.forename: Irshad
authors.initials: I
authors.lastname: Ahmad
authors.affiliation: Department of Biochemistry, Faculty of Life Sciences, Aligarh Muslim University Aligarh, India. Electronic address: imrananaseem2009@gmail.com.
authors.forename: Imrana
authors.initials: I
authors.lastname: Naseem
mesh_terms: D000975:Antioxidants / Q000494:pharmacology*; D001665:Binding Sites; D005942:Gluconates / Q000737:chemistry; D017127:Glycation End Products, Advanced / Q000037:antagonists & inhibitors / Q000737:chemistry* / Q000494:pharmacology; D006031:Glycosylation; D006146:Guanidines / Q000737:chemistry; D006454:Hemoglobins / Q000737:chemistry*; D006801:Humans; D007783:Lactones / Q000737:chemistry; D015227:Lipid Peroxidation / Q000187:drug effects; D008214:Lymphocytes / Q000737:chemistry / Q000187:drug effects; D062105:Molecular Docking Simulation; D061251:Primary Cell Culture; D011485:Protein Binding; D011794:Quercetin / Q000494:pharmacology*; D012709:Serum Albumin / Q000737:chemistry*; D012996:Solutions
chemical_list: D000975:Antioxidants; D005942:Gluconates; D017127:Glycation End Products, Advanced; D006146:Guanidines; D006454:Hemoglobins; D007783:Lactones; D012709:Serum Albumin; D012996:Solutions; D011794:Quercetin; C004479:pimagedine; C010730:beta-glucono-1,5-lactone
keywords: AGEs; Comet assay; Lipid and protein oxidation; Molecular docking; Quercetin