Title : Evidence that tacrolimus augments the bioavailability of mycophenolate mofetil through the inhibition of mycophenolic acid glucuronidation.

Pub. Date : 1999 Feb

PMID : 10051052






6 Functional Relationships(s)
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1 This finding was accompanied by a corresponding reduction of the inactive glucuronide metabolite of MPA (MPAG) in patients, suggesting that tacrolimus may effect the conversion of MPA to MPAG by the enzyme UDP-glucuronosyltransferase (UDPGT). Tacrolimus UDP glucuronosyltransferase family 1 member A4 Homo sapiens
2 This finding was accompanied by a corresponding reduction of the inactive glucuronide metabolite of MPA (MPAG) in patients, suggesting that tacrolimus may effect the conversion of MPA to MPAG by the enzyme UDP-glucuronosyltransferase (UDPGT). Tacrolimus UDP glucuronosyltransferase family 1 member A4 Homo sapiens
3 The addition of clinically relevant concentrations of CsA (200-1,000 ng/mL) or tacrolimus (10-25 ng/mL) resulted in a dose-dependent inhibition of the UDPGT enzyme by both agents with tacrolimus, which was approximately 60-fold more efficient as an inhibitor. Tacrolimus UDP glucuronosyltransferase family 1 member A4 Homo sapiens
4 The addition of clinically relevant concentrations of CsA (200-1,000 ng/mL) or tacrolimus (10-25 ng/mL) resulted in a dose-dependent inhibition of the UDPGT enzyme by both agents with tacrolimus, which was approximately 60-fold more efficient as an inhibitor. Tacrolimus UDP glucuronosyltransferase family 1 member A4 Homo sapiens
5 The calculated inhibition constants (KI) of tacrolimus and CsA for the purified UDPGT were 27.3+/-5.6 ng/ml and 2,518+/-1473 ng/ml. Tacrolimus UDP glucuronosyltransferase family 1 member A4 Homo sapiens
6 This finding suggested that the significantly more efficient inhibition of UDPGT by tacrolimus may occur by a more complicated mechanism that is yet to be determined. Tacrolimus UDP glucuronosyltransferase family 1 member A4 Homo sapiens