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Mitochondrial DNA oxidation and manganese superoxide dismutase activity in peripheral blood mononuclear cells from type 2 diabetic patients.

Abstract：

AIM:To investigate the balance between parameters of oxidative stress and antioxidant defences in the mitochondria of peripheral blood mononuclear cells (PBMCs) of type 2 diabetic patients with late complications. METHODS:Ten type 2 diabetic patients with late diabetic complications and 10 age-matched healthy volunteers (controls) were prospectively recruited. Mitochondrial DNA (mtDNA) oxidative damage and mtDNA content were measured as indices of oxidative stress. Manganese superoxide dismutase (MnSOD) activity has been used as an index of mitochondrial antioxidant defence. Mitochondrial respiratory-chain function (cytochrome C oxidase activity) was also assessed. RESULTS:Mitochondrial DNA (mtDNA) oxidation was significantly higher in the PBMCs of diabetic patients than in control subjects (P<0.0001) and, although mtDNA content was lower in the diabetic group, this was not statistically significant. MnSOD activity was significantly increased in PBMCs of type 2 diabetic patients compared with healthy controls (1366+/-187 versus 686+/-167 U/g of protein; P=0.01), and was related to mtDNA oxidative damage. No differences in mitochondrial respiratory-chain function were found between diabetic patients and controls. CONCLUSION:PMBCs from type 2 diabetic patients with late diabetic complications exhibit high mtDNA oxidative damage. The degree of mtDNA oxidation was associated with an increase in MnSOD as an adaptive response to oxidative stress. The consequences of mtDNA oxidative damage on PBMC function and the progression of diabetic complications remain to be elucidated.

journal_name

Diabetes Metab

journal_title

Diabetes & metabolism

authors

García-Ramírez M,Francisco G,García-Arumí E,Hernández C,Martínez R,Andreu AL,Simó R

doi

10.1016/j.diabet.2007.10.011

subject

Has Abstract

pub_date

2008-04-01 00:00:00

pages

117-24

issue

2

eissn

1262-3636

issn

1878-1780

pii

S1262-3636(08)00004-9

journal_volume

34

pub_type

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