JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
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Urinary excretion of alpha-GST and albumin in rheumatoid arthritis patients treated with methotrexate or other DMARDs alone or in combination with NSAIDs.

OBJECTIVE: To evaluate the effect of methotrexate (MTX) and other disease-modifying anti-rheumatic drugs (DMARDs) alone or in combination with non-steroidal anti-inflammatory drugs (NSAIDs) on the urinary excretion of alpha-glutathione S-transferase (alpha-GST) and albumin in rheumatoid arthritis (RA) patients.

METHODS: Nineteen RA patients starting treatment with MTX were followed for 1 year with measurements of urinary alpha-GST, urinary albumin, and urinary and plasma creatinine at the start of treatment, and after 16, 28, and 52 weeks. A larger group of RA patients (n = 72) undergoing long-term treatment with different DMARDs was compared with 79 healthy controls regarding urinary alpha-GST and albumin. alpha-GST was quantified by an enzyme immunoassay. Urine albumin was measured turbidimetrically.

RESULTS: The urine-alpha-GST/urine-creatinine ratio and the urine-albumin/urine-creatinine ratio did not change during 52 weeks of treatment with MTX. The long-term DMARD-treated RA patients and the healthy controls were comparable with regard to the urine-alpha-GST/urine-creatinine ratio and the urine-albumin/urine-creatinine ratio. All patients had preserved renal function as assessed by plasma creatinine, and none had proteinuria using urine dipstick methods.

CONCLUSION: DMARD-treated RA patients with normal serum creatinine had no detectable renal injuries assessed by the urinary excretions of alpha-GST and albumin.

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