代谢
环孢素在肝脏中通过细胞色素P450 3A(CYP3A)酶系统进行广泛代谢,在一定程度上也会通过胃肠道和肾脏代谢。在人的胆汁、粪便、血液和尿液中已经鉴定出至少25种代谢物。尽管环孢素的环状肽结构对代谢相对抵抗,但侧链被广泛代谢。所有的代谢物与母药相比,生物活性和毒性都降低了。
Cyclosporine is extensively metabolized in the liver by the cytochrome-P450 3A (CYP3A) enzyme system & to a lesser degree by the GI tract & kidneys. At least 25 metabolites have been identified in human bile, feces, blood, & urine. Although the cyclic peptide structure of cyclosporine is relatively resistant to metab, the side chains are extensively metabolized. All of the metabolites have both reduced biological activity & toxicity compared to the parent drug.
来源:Hazardous Substances Data Bank (HSDB)