Abstract
BackgroundTriptolide, an active ingredient of Chinese medicine plant Tripterygium wilfordii Hook.f., has been shown to exert anti-tumor, immunosuppressive, anti-inflammatory, and anti-fertility pharmacological effects. However, triptolide also causes severe side effects, which are manifested as toxicities in multiple organs. The aim of this study was to analyze the role of extrahepatic cytochrome P450 enzymes in triptolide-induced toxicity.MethodsXh-CL mouse model with normal liver, but low extrahepatic P450 expression levels was used in this study. Xh-CL mice and C57BL/6 (wildtype, WT) mice were treated with 200 μg/kg triptolide intraperitoneally every other day for 30 days. The serum levels of alanine aminotransferase (ALT), aspartate transaminase (AST), creatine (Cre), and blood urea nitrogen (BUN) were detected by kits. The changes of tissue were observed with H&E staining. Two groups of mice (Xh-CL and WT animals), were received a single dose of 1 mg/kg TP by oral gavage for pharmacokinetic analysis.ResultsXh-CL mice displayed higher serum levels of ALT, AST, Cre, and BUN compared to untreated Xh-CL mice. The organ-to-body weight ratio for spleen was high, while that for testes was low. Histopathological changes were observed in multiple organs. However, compared with triptolide-treated WT mice, no significant differences in either blood chemistry or histopathology were recorded. Furthermore, pharmacokinetic studies showed no significant differences between triptolide-treated Xh-CL and WT mice.ConclusionsOur findings suggest that sub-chronic triptolide treatment can induce toxicities in mouse kidney, spleen, and testis with or without normal local P450 functions. Therefore, extrahepatic P450s play an insignificant role in triptolide-induced toxicity.
Highlights
Triptolide, an active ingredient of Chinese medicine plant Tripterygium wilfordii Hook.f., has been shown to exert anti-tumor, immunosuppressive, anti-inflammatory, and anti-fertility pharmacological effects
Previous studies have confirmed that cytochrome P450s are responsible for the hydroxylation of TP in vitro [5], and higher expression of hepatic CYP3A can facilitate the biotransformation of TP and decrease its hepatotoxicity in rats [6, 7]
These findings suggested that the decreased activity of hepatic CYP3A was a key factor responsible for the adverse effects associated with TP in vivo
Summary
Triptolide, an active ingredient of Chinese medicine plant Tripterygium wilfordii Hook.f., has been shown to exert anti-tumor, immunosuppressive, anti-inflammatory, and anti-fertility pharmacological effects. Previous studies have confirmed that cytochrome P450s are responsible for the hydroxylation of TP in vitro [5], and higher expression of hepatic CYP3A can facilitate the biotransformation of TP and decrease its hepatotoxicity in rats [6, 7]. These findings suggested that the decreased activity of hepatic CYP3A was a key factor responsible for the adverse effects associated with TP in vivo. Significantly low hepatic CYP3A metabolic activity was found only in a small percentage of the studied group, indicating that low activity of hepatic CYP3A, as a single factor, was not
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