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• W2000566649 abstract "Azathioprine (AZA) is characterized by a high interindividual variability in bioavailability and metabolism. AZA is converted into 6-thioguanine nucleotides (6-TGN) to which the immune modifier activity is attributed. The 6-TGN levels are known to be affected by the activity of the key enzyme, thiopurine methyltransferase (TPMT), which is under genetic dependence. The authors measured a significantly lower TPMT activity in 53 women with systemic lupus erythematosus (SLE) (12.2 +/- 2.4 pmol/h/ml RBC; P < 0.01) when compared with 30 healthy control participants (13.15 +/- 3.1 pmol/h/ml RBC) but not with 28 patients with other dysimmune diseases (non-SLE; 13.0 +/- 3.0 pmol/h/ml RBC; P = 0.10). To evaluate the impact of TPMT activity on the concentrations of AZA metabolites, we measured the TPMT activity and 6-TGN levels in a subgroup of 26 patients in remission and treated with a stable dose of AZA (mean value: 1.9 +/- 0.5 mg/kg/day) for at least six months (n = 13 with SLE and n = 13 with other dysimmune diseases, ie, non-SLE). In such a subgroup, no correlation between 6-TGN levels and TPMT activity was observed. However, patients with SLE presented lower TPMT activity and higher 6-TGN levels (215 +/- 123 versus 140 +/- 75 pmol/8 x 10(8) RBC in non-SLE patients; P < 0.04). It must be noted that transient increase in 6-methylmercaptopurine levels (6-MMP), a putative toxic metabolite (up to 21.7 nmol/8 x 10(8) RBC), was more frequently observed in the non-SLE group (P < 0.01). Even if a relationship was observed between low TPMT activity and 6-TGN levels in SLE, its clinical impact appears to be limited as far as regular hematologic controls are performed." @default.
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• W2000566649 date "2001-05-01" @default.
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• W2000566649 title "High 6-Thioguanine Nucleotide Levels and Low Thiopurine Methyltransferase Activity in Patients With Lupus Erythematosus Treated With Azathioprine" @default.
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• W2000566649 doi "https://doi.org/10.1097/00045391-200105000-00002" @default.
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