title: Role of NF-κB activation and VEGF gene polymorphisms in VEGF up regulation in non-proliferative and proliferative diabetic retinopathy.
abstract: The present study was aimed to investigate the relation between nuclear factor kappa beta (NFκB) activation and downstream up-regulation of vascular endothelial growth factor (VEGF) in diabetic retinopathy (DR). Moreover the study was intended to evaluate the role of VEGF gene single nucleotide polymorphisms (SNPs) in DR occurrence and to investigate the functional relevance of VEGF gene SNPs in terms of VEGF expression in DR. Serum level of VEGF, VEGF R1 (receptor 1), VEGF R 2 (receptor 2) and NFκB (p50/65) activity was measured by enzyme linked immune sorbent assay. Genotyping and allelic composition of different SNPs i.e., rs2010963, rs3025039, rs1570360 and rs 2071559 were investigated by Taqman SNP genotyping assay. VEGF, NFκB p50/p65, and VEGF R1 & R2 gene expressions were quantified by real time quantitative polymerase chain reaction. Increased NFκB p50/p65 activity and expressions were observed in non proliferative diabetic retinopathy (NPDR) and proliferative diabetic retinopathy (PDR) subjects compared to type 2 diabetes mellitus without retinopathy (DNR) group. Significantly elevated levels of serum VEGF and highest VEGF expression were found among PDR subjects compared to DNR or NPDR subjects. CC genotype and C allele of rs2010963 and TT genotype and T allele of rs3025039 were significantly over represented among PDR subjects compared to DNR group. Increased activation of NFκβ in NPDR and PDR subjects might involve increased up regulation of VEGF. VEGF SNPs i.e., rs2010963 C allele and rs3025039 T allele might be associated with PDR occurrence and in turn regulates VEGF expression among PDR subjects.
authors.affiliation: Department of Biochemistry, Dr. B C Roy Post Graduate Institute of Basic Medical Education and Research (IPGME&R), 244B, A.J.C Bose Road, Kolkata, 700020, India, schoudhuri6@gmail.com.
authors.forename: Subhadip
authors.initials: S
authors.lastname: Choudhuri
authors.forename: Imran H
authors.initials: IH
authors.lastname: Chowdhury
authors.forename: Shibali
authors.initials: S
authors.lastname: Das
authors.forename: Deep
authors.initials: D
authors.lastname: Dutta
authors.forename: Avijit
authors.initials: A
authors.lastname: Saha
authors.forename: Rajarshi
authors.initials: R
authors.lastname: Sarkar
authors.forename: Lakshmi K
authors.initials: LK
authors.lastname: Mandal
authors.forename: Satinath
authors.initials: S
authors.lastname: Mukherjee
authors.forename: Basudev
authors.initials: B
authors.lastname: Bhattacharya
mesh_terms: D000483:Alleles; D003924:Diabetes Mellitus, Type 2 / Q000235:genetics; D003930:Diabetic Retinopathy / Q000235:genetics*; D005260:Female; D005838:Genotype; D006801:Humans; D008297:Male; D008875:Middle Aged; D016328:NF-kappa B / Q000235:genetics*; D020641:Polymorphism, Single Nucleotide / Q000235:genetics*; D040262:Receptors, Vascular Endothelial Growth Factor / Q000235:genetics; D015854:Up-Regulation / Q000235:genetics*; D042461:Vascular Endothelial Growth Factor A / Q000235:genetics*
chemical_list: D016328:NF-kappa B; C467484:VEGFA protein, human; D042461:Vascular Endothelial Growth Factor A; D040262:Receptors, Vascular Endothelial Growth Factor