title: Endothelial nitric oxide synthase (eNOS) 4b/a polymorphism and the risk of diabetic nephropathy in type 2 diabetes mellitus: A meta-analysis.
abstract: Many studies have accessed the association between eNOS-4b/a polymorphism and the risk of diabetic nephropathy (DN) among type 2 diabetic subjects. However, the results are conflicting and inconclusive. The aim of current meta-analysis was to more precisely estimate the relationship. Pubmed, Embase, the China National Knowledge Infrastructure and the Wanfang Database were searched for articles published up to May 26th, 2013 that addressed eNOS-4b/a polymorphism and the risk of DN among type 2 diabetic subjects. 18 studies were included in this meta-analysis. eNOS-4b/a polymorphisms were associated with an overall significantly increased risk of DN (allele model: OR = 1.44, 95% CI = 1.14-1.82; additive model: OR = 2.03, 95% CI = 1.14-3.62; dominant model: OR = 1.34, 95% CI = 1.07-1.68; recessive model: OR = 2.01, 95% CI = 1.12-3.61). Subgroup analysis revealed a significant association between the eNOS-4b/a polymorphism and DN in Asian population, especially in Chinese population, but not in non Asian populations. Our meta-analysis supported an association between the 4b/a polymorphism of eNOS gene and increased risk of DN in type 2 diabetes among Asians, especially in Chinese population.
authors.affiliation: Key Laboratory of Hormone and Development (Ministry of Health), Metabolic Disease Hospital & Tianjin Institute of Endocrinology, Tianjin Medical University, Tianjin 300070, China.
authors.forename: Ze-Jun
authors.initials: ZJ
authors.lastname: Ma
authors.affiliation: Key Laboratory of Hormone and Development (Ministry of Health), Metabolic Disease Hospital & Tianjin Institute of Endocrinology, Tianjin Medical University, Tianjin 300070, China.
authors.forename: Rui
authors.initials: R
authors.lastname: Chen
authors.affiliation: Key Laboratory of Hormone and Development (Ministry of Health), Metabolic Disease Hospital & Tianjin Institute of Endocrinology, Tianjin Medical University, Tianjin 300070, China.
authors.forename: Hui-Zhu
authors.initials: HZ
authors.lastname: Ren
authors.affiliation: Key Laboratory of Hormone and Development (Ministry of Health), Metabolic Disease Hospital & Tianjin Institute of Endocrinology, Tianjin Medical University, Tianjin 300070, China.
authors.forename: Xin
authors.initials: X
authors.lastname: Guo
authors.affiliation: Key Laboratory of Hormone and Development (Ministry of Health), Metabolic Disease Hospital & Tianjin Institute of Endocrinology, Tianjin Medical University, Tianjin 300070, China.
authors.forename: Jun Guo
authors.initials: JG
authors.lastname: Chen
authors.affiliation: Key Laboratory of Hormone and Development (Ministry of Health), Metabolic Disease Hospital & Tianjin Institute of Endocrinology, Tianjin Medical University, Tianjin 300070, China.
authors.forename: Li-Ming
authors.initials: LM
authors.lastname: Chen
keywords: 4b/a; ACE, angiotensin-converting enzyme; CI, confidence interval; CNKI, China National Knowledge Infrastructure; DN, diabetic nephropathy; Diabetic nephropathy; ESRD, end-stage renal disease; FEM, fixed-effects model; HWE, Hardy–Weinberg equilibrium; MTHFR, methylenetetrahydrofolate reductase; Meta-analysis; OR, odds ratio; Polymorphism; REM, random-effects model; eNOS; eNOS, endothelial nitric oxide synthase