title: The manganese superoxide dismutase Val16Ala polymorphism is associated with decreased risk of diabetic nephropathy in Chinese patients with type 2 diabetes.
abstract: The aim of the present study was to evaluate the relationship of the manganese superoxide dismutase (MnSOD) Val16Ala (V16A) polymorphism with type 2 diabetes mellitus (T2DM) and diabetic nephropathy (DN) in Chinese patients, a case-control study was performed. This case-control study included 172 non-diabetic (non-DM) subjects and 257 T2DM patients with or without DN. Among T2DM patients, 154 had DN [albumin excretion rate (AER) >or= 30 mg/24 h] and 103 did not (AER < 30 mg/24 h), but the latter with known diabetes duration >or=10 years. The DN patients were further divided into groups with microalbuminuria (DN-1; n = 92; 300 > AER >or= 30 mg/24 h) and overt albuminuria nephropathy (DN-2; n = 62; AER >or= 300 mg/24 h). PCR-restriction fragment length polymorphism (RFLP) was used to detect genotypes of the V16A polymorphism for all subjects. The genotypic distributions of the V16A polymorphism in non-DM and T2DM subjects were in Hardy-Weinberg equilibrium and Ala allelic frequencies did not differ (11.9% vs. 9.1%; P > 0.05). The AA+VA genotypic frequencies of DN patients were significantly lower than those of non-DN patients (11.6% vs. 24.3%; P = 0.008). Multiple logistic regression analysis revealed that except for HbA1C, triglyceride, and BMI, which were high risk factors for the development of DN, the AA+VA genotype of the MnSOD-V16A polymorphism was an independent protective factor from the development of DN (odds ratio = 0.42; 95% CI = 0.18-0.95; P = 0.037) in T2DM patients. Our results suggested that the MnSOD-V16A polymorphism is associated with decreased risk of diabetic nephropathy in Chinese patients with type 2 diabetes.
authors.affiliation: Shanghai Diabetes Institute, Department of Endocrinology and Metabolism, Shanghai Jiaotong University Affiliated Sixth People's Hospital, 600 Yishan Road, Shanghai, 200233, China. liulimei2001@hotmail.com
authors.forename: Limei
authors.initials: L
authors.lastname: Liu
authors.forename: Taishan
authors.initials: T
authors.lastname: Zheng
authors.forename: Niansong
authors.initials: N
authors.lastname: Wang
authors.forename: Feng
authors.initials: F
authors.lastname: Wang
authors.forename: Ming
authors.initials: M
authors.lastname: Li
authors.forename: Jiamei
authors.initials: J
authors.lastname: Jiang
authors.forename: Ruie
authors.initials: R
authors.lastname: Zhao
authors.forename: Lifang
authors.initials: L
authors.lastname: Li
authors.forename: Weijing
authors.initials: W
authors.lastname: Zhao
authors.forename: Qihan
authors.initials: Q
authors.lastname: Zhu
authors.forename: Weiping
authors.initials: W
authors.lastname: Jia
mesh_terms: D000368:Aged; D000409:Alanine / Q000235:genetics*; D000483:Alleles; D044466:Asian People; D015331:Cohort Studies; D003924:Diabetes Mellitus, Type 2 / Q000150:complications / Q000201:enzymology / Q000235:genetics*; D003928:Diabetic Nephropathies / Q000201:enzymology / Q000209:etiology / Q000235:genetics*; D020022:Genetic Predisposition to Disease; D006801:Humans; D008875:Middle Aged; D011110:Polymorphism, Genetic; D012150:Polymorphism, Restriction Fragment Length; D012306:Risk; D013482:Superoxide Dismutase / Q000235:genetics*; D014633:Valine / Q000235:genetics*
chemical_list: D013482:Superoxide Dismutase; D014633:Valine; D000409:Alanine