Glycaemic control in relation to xanthine oxidase and antioxidant indices in Malaysian Type 2 diabetes patients.
OBJECTIVE
Increased oxidative stress and oxidative damage are present in Type 2 diabetes mellitus (DM). The aim of this study was to assess the oxidative stress levels in the three major ethnic groups in Malaysia and to study the association between glycaemic control and oxidant-antioxidant levels in these patients.


METHODS
Oxidative indices and glycaemic control were assessed in 650 Type 2 DM patients and 280 healthy age-matched controls by known established methods.


RESULTS
Type 2 DM patients had significantly lower levels of antioxidant enzymes and non-enzymatic antioxidant (FRAP) and increased levels of HbA(1c), fasting blood glucose (FBG), malondialdehyde (MDA) and xanthine oxidase (XO) when compared with control subjects. Markers of oxidative stress were more apparent in Indian patients compared with Malay and Chinese patients. Correlation analysis of oxidant-antioxidant parameters as a function of HbA(1c) in each ethnic group revealed a strong association of HbA(1c) with oxidative indices.


CONCLUSIONS
The present study provides evidence for the possible contribution of XO to oxidative stress and the pathophysiology of diabetes. HbA(1c) remains an important marker of glycaemic control for the management of Type 2 DM, but other confounding factors that predispose or lead to oxidative stress should also be taken into consideration.
Kuppusamy
U R
UR
Department of Molecular Medicine, Faculty of Medicine, University of Malaya, Kuala Lumpur, Malaysia. umah@um.edu.my
Indran
M
M
Rokiah
P
P
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000975:Antioxidants / Q000032:analysis*; D015415:Biomarkers / Q000097:blood; D001786:Blood Glucose / Q000032:analysis*; D002681:China / Q000208:ethnology; D003924:Diabetes Mellitus, Type 2 / Q000097:blood / Q000208:ethnology / Q000378:metabolism*; D005260:Female; D006442:Glycated Hemoglobin / Q000032:analysis; D006801:Humans; D007194:India / Q000208:ethnology; D008296:Malaysia / Q000453:epidemiology; D008297:Male; D008875:Middle Aged; D018384:Oxidative Stress / Q000502:physiology; D014969:Xanthine Oxidase / Q000097:blood*
D000975:Antioxidants; D015415:Biomarkers; D001786:Blood Glucose; D006442:Glycated Hemoglobin; D014969:Xanthine Oxidase