Title : The role of human CYP2C8 and CYP2C9 variants in pioglitazone metabolism in vitro.

Pub. Date : 2009 Dec

PMID : 19614891






9 Functional Relationships(s)
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1 The role of human CYP2C8 and CYP2C9 variants in pioglitazone metabolism in vitro. Pioglitazone cytochrome P450 family 2 subfamily C member 8 Homo sapiens
2 The cytochrome P450 enzyme CYP2C8 appears to have a major role in pioglitazone metabolism. Pioglitazone cytochrome P450 family 2 subfamily C member 8 Homo sapiens
3 The present study was conducted to further clarify the role of individual CYPs and of the CYP2C8/9 polymorphisms in the primary metabolism of pioglitazone in vitro. Pioglitazone cytochrome P450 family 2 subfamily C member 8 Homo sapiens
4 Pioglitazone (2-400 microM) was incubated with isolated cytochrome P450 enzymes or human liver microsomes, some of them carrying either the CYP2C8*3/*3 genotype (and also the CYP2C9*2/*2 genotype) or the CYP2C8*1/*1 genotype (five samples each). Pioglitazone cytochrome P450 family 2 subfamily C member 8 Homo sapiens
5 Pioglitazone (2-400 microM) was incubated with isolated cytochrome P450 enzymes or human liver microsomes, some of them carrying either the CYP2C8*3/*3 genotype (and also the CYP2C9*2/*2 genotype) or the CYP2C8*1/*1 genotype (five samples each). Pioglitazone cytochrome P450 family 2 subfamily C member 8 Homo sapiens
6 Mean intrinsic clearance of pioglitazone to the metabolite M-IV was highest for CYP2C8 and CYP1A2 with 58 pmol M-IV/min/nmol CYP P450/microM pioglitazone each, 53 for CYP2D6*1, 40 for CYP2C19*1, and 34 for CYP2C9*2, respectively. Pioglitazone cytochrome P450 family 2 subfamily C member 8 Homo sapiens
7 Mean intrinsic clearance of pioglitazone to the metabolite M-IV was highest for CYP2C8 and CYP1A2 with 58 pmol M-IV/min/nmol CYP P450/microM pioglitazone each, 53 for CYP2D6*1, 40 for CYP2C19*1, and 34 for CYP2C9*2, respectively. Pioglitazone cytochrome P450 family 2 subfamily C member 8 Homo sapiens
8 CYP2C8*1/*1 microsomes (25 +/- 4 pmol M-IV/min/mg protein/muM pioglitazone) showed lower intrinsic clearance of pioglitazone than CYP2C8*3/*3 microsomes (35 +/- 9, p = 0.04). Pioglitazone cytochrome P450 family 2 subfamily C member 8 Homo sapiens
9 CYP2C8*1/*1 microsomes (25 +/- 4 pmol M-IV/min/mg protein/muM pioglitazone) showed lower intrinsic clearance of pioglitazone than CYP2C8*3/*3 microsomes (35 +/- 9, p = 0.04). Pioglitazone cytochrome P450 family 2 subfamily C member 8 Homo sapiens