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Plasma homocysteine concentrations in patients with type 1 diabetes
C C Cronin1, J M McPartlin, D G Barry
1Department of Medicine, University Hospital and National University of Ireland, Cork.
Insights
Plasma total homocysteine (tHcy) levels differ in type 1 diabetes patients compared to controls, with metabolism changes observed. These findings suggest homocysteine may not be a significant risk factor for vascular disease in these patients.
Area of Science:
- Endocrinology
- Vascular Biology
- Metabolic Research
Background:
- Total homocysteine (tHcy) is a known risk factor for vascular disease.
- Understanding tHcy in type 1 diabetes is crucial for assessing vascular risk.
Purpose of the Study:
- To measure plasma tHcy in type 1 diabetes patients.
- To investigate tHcy associations with clinical factors and folic acid.
- To compare tHcy metabolism between diabetic patients and controls.
Main Methods:
- Plasma tHcy and folic acid measured in 119 type 1 diabetes patients and 51 controls.
- Patients characterized for microvascular complications and neuropathy.
Main Results:
- No sex difference in plasma tHcy for diabetic patients, unlike controls.
- Plasma tHcy correlated with age in patients, not controls.
- Male patients without complications had lower tHcy than male controls.
- Diabetic patients had higher plasma folic acid levels.
Conclusions:
- Homocysteine metabolism differs in type 1 diabetes patients.
- tHcy is unlikely pathogenic in early diabetic microvascular disease, especially in males.
Objective:
To determine the plasma concentration of total homocysteine (tHcy), a recognized risk factor for vascular disease, in patients with type 1 diabetes and to examine the relationships with age, sex, duration of diabetes, microvascular complications and neuropathy, and folic acid concentration.
Research Design And Methods:
Plasma tHcy and folic acid concentrations were measured in a randomly selected cohort of type 1 diabetic patients (n = 119), well characterized as regards microvascular complications, and in a matched control group (n = 51).
Results:
Plasma tHcy was higher in male than in female control subjects (geometric mean [95% CI]: 9.3 [8.0-10.9] vs. 6.1 [5.2-7.2] micromol/l, P < 0.001), as previously described, but there was no sex difference in diabetic patients. Plasma tHcy significantly correlated with age in patients (r = 0.348, P < 0.01) but not in control subjects (r = 0.007, P = 0.96). Male patients without microvascular complications had lower plasma tHcy concentrations than did male control subjects (6.2 [5.1-7.5] vs. 9.3 [8.0-10.9] micromol/l, P < 0.001), but values in female patients without complications were similar to those of female control subjects. Plasma folic acid concentration was higher in diabetic patients than in control subjects. The expected negative association between plasma tHcy and folic acid was stronger in control subjects than in patients.
Conclusions:
Subnormal tHcy concentrations in male patients, the absence of a sex difference, and the positive association with age indicate that homocysteine metabolism differs between type 1 diabetic patients and control subjects. Homocysteine is unlikely to be of pathogenic significance in patients, particularly male subjects, with early microvascular disease and/or neuropathy.
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