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Diabetes mellitus and hyperhomocysteinemia

Coen van Guldener1, Coen D A Stehouwer

  • 1Department of Internal Medicine and Institute of Cardiovascular Research, Vrije Universiteit Medical Centre, Amsterdam, The Netherlands.

Seminars in Vascular Medicine
|October 14, 2005
PubMed

Insights

Diabetic patients face higher cardiovascular risks, partly due to elevated homocysteine levels. Screening and folic acid treatment for hyperhomocysteinemia may reduce vascular complications in diabetes.

Area of Science:

  • Cardiovascular Research
  • Metabolic Disorders
  • Clinical Nutrition

Background:

  • Patients with diabetes mellitus (DM) have increased cardiovascular disease (CVD) risk.
  • Hyperhomocysteinemia, a condition of elevated homocysteine, is a potential contributor to atherothrombosis in diabetic individuals.
  • While plasma homocysteine levels are typically normal in diabetes, variations can occur due to factors like renal function and folate status.

Purpose of the Study:

  • To investigate the association between plasma homocysteine levels and cardiovascular risk factors in patients with diabetes mellitus.
  • To explore the relationship between hyperhomocysteinemia and microvascular and macrovascular complications in type 1 and type 2 diabetes.
  • To determine if homocysteine levels predict adverse outcomes, including mortality, in diabetic populations.

Main Methods:

  • Review of existing literature on plasma homocysteine levels in diabetic patients.
  • Analysis of studies correlating homocysteine concentrations with microalbuminuria, retinopathy, and macrovascular disease.
  • Examination of data comparing the association of hyperhomocysteinemia with vascular risk in diabetic versus non-diabetic subjects.

Main Results:

  • Hyperhomocysteinemia is linked to microalbuminuria and retinopathy in both type 1 and type 2 diabetes.
  • In type 2 diabetes, higher plasma homocysteine concentrations correlate with macrovascular disease and mortality, with a stronger association than in non-diabetics.
  • Insulin resistance was not found to be a significant determinant of plasma homocysteine levels.

Conclusions:

  • Hyperhomocysteinemia may synergistically increase vascular risk in patients with diabetes.
  • Diabetic patients with hyperhomocysteinemia are candidates for screening and potential folic acid treatment to mitigate vascular complications.
  • Further clinical trials are needed to confirm the efficacy of homocysteine-lowering therapies in this population.

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