Hyperhomocysteinemia and elevated ox-LDL in Tunisian type 2 diabetic patients: Role of genetic and dietary factors

Introduction: Total plasma homocysteine (tHcy) is an emerging risk factor for the development of atherosclerosis. However, its relationship with diabetes is still unclear. Objectives: We evaluated the association between tHcy levels and methylenetetrahydrofolate reductase (MTHFR) 677C → T genotype in a type 2 diabetes mellitus (DM) population and their relationship with oxidized LDL (ox-LDL) according to dietary habits and vascular complications. Design and methods: Eighty-six DM patients were compared to 120 healthy volunteers. Results: Associated higher tHcy levels and significantly higher ox-LDL levels (p < 0.001) were found in DM patients compared to healthy subjects. Homozygosity for the T allele of MTHFR was more frequent in diabetics than in healthy subjects (12.8% vs. 7.2%) and it was associated with higher tHcy levels. Moreover, this elevated level was associated with significantly higher ox-LDL levels in DM patients with hypertension (p < 0.05). Improving folate and vitamin C intakes could have beneficial effects on lowering the tHcy and ox-LDL levels. Conclusions: The interplay of genetic and dietary factors modulates the effect of homocysteine on cardiovascular risk factors. © 2007 The Canadian Society of Clinical Chemists.