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Mild hyperhomocysteinemia and the common C677T polymorphism of methylene tetrahydrofolate reductase gene are not associated with the metabolic syndrome in Type 2 diabetes

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Abstract

A moderate increase of total homocysteine (tHcy) plasma levels seems to increase cardiovascular disease (CVD) risk in Type 2 diabetic subjects, but its relationship with diabetes and insulin-resistance is still controversial. We examined whether mild hyperhomocysteinemia and its major genetic determinant would cluster with the metabolic syndrome (MS) in Type 2 diabetes. One hundred Type 2 diabetic subjects with and without MS were enrolled in the study. Fasting tHcy, vitamin B12, and folate plasma levels, insulin-resistance [assessed by homeostasis model assessment, (HOMAIR)] and the methylene tetrahydrofolate reductase (MTHFR) C677T genotype were assessed in all the participants. Geometric mean tHcy concentration and the prevalence of mild hyperhomocysteinemia, as commonly defined by tHcy ≥15 μmol/l, were comparable in diabetic subjects with and without MS, even after adjustment for age, sex, vitamin B12, folate and creatinine levels. In both groups, the MTHFR C677T genotype distribution was not significantly different from the Hardy-Weinberg equilibrium, with a TT homozygous frequency of 21% in subjects with and 18% in those without the syndrome (p=ns). tHcy plasma levels and the degree of insulin-resistance did not differ across MTHFR genotypes in both groups, even after multivariable adjustment. Overall, tHcy significantly correlated with creatinine (r=0.25; p=0.009) and trygliceride concentrations (r=0.24; p=0.02), but not with HOMAIR. At multivariate analysis, only creatinine was significantly correlated with tHcy levels (β=0.42; p=0.001). In conclusion, hyperhomocysteinemia and the common C677T variant of MTHFR gene are not associated with MS in Type 2 diabetic subjects. (J. Endocrinol. Invest. 29: 201–207, 2006)

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Authors and Affiliations

  1. Department of Internal Medicine, University of Messina, Messina, Italy

    G. T. Russo MD, A. Di Benedetto, E. Alessi, R. La Scala, E. Di Cesare, G. Raimondo & D. Cucinotta

  2. Department of Biochemical Sciences, University of Messina, Messina, Italy

    R. Ientile

  3. Department of Experimental Pathology and Microbiology, University of Messina, Messina, Italy

    A. Antico & G. Nicocia

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  1. G. T. Russo MD
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Russo, G.T., Di Benedetto, A., Alessi, E. et al. Mild hyperhomocysteinemia and the common C677T polymorphism of methylene tetrahydrofolate reductase gene are not associated with the metabolic syndrome in Type 2 diabetes. J Endocrinol Invest 29, 201–207 (2006). https://doi.org/10.1007/BF03345540

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