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Journal Article
Research Support, Non-U.S. Gov't
Determination of asymmetric and symmetric dimethylarginines in plasma of hyperhomocysteinemic subjects.
Amino Acids 2005 June
The aim of this study was to investigate the possible relationship among dimethylarginines (asymmetric, ADMA; symmetric, SDMA) and homocysteine (Hcy) levels in subjects affected by chronic, mild to intermediate, hyperhomocysteinemia. ADMA and SDMA were assayed by an optimised HPLC method in 75 patients (Hcy = 20.8 micromol/L, 17.1-30.2; median and percentile range) and, for comparison, in 85 healthy subjects (Hcy = 8.0 micromol/L, 7.0-9.1). In controls, the cut-off values were set at 0.61 micromol/L for ADMA and 0.56 or 0.48 micromol/L for male and female SDMA, respectively. In patients, ADMA and SDMA levels were increased (p < 0.001) with respect to controls, but no correlation with Hcy was observed. Hyperhomocysteinemic subjects showed a different behaviour in respect to ADMA and SDMA levels and this allowed their stratification in 3 subgroups characterized by ADMA and SDMA in the normal range, only SDMA, or both ADMA and SDMA over the cut-off values. A lack of correlation with Hcy was again observed, thus minimizing the direct role of Hcy on ADMA and SDMA metabolism and suggesting the need for further studies on this issue.
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