Activation of Fas receptor modulates cytochrome P450 3A4 expression in human colon carcinoma cells.
The Fas (CD95, APO-1) receptor is a transmembrane cell surface receptor that mediates apoptosis in many cell types when bound by the Fas ligand or cross-linked by agonistic anti-Fas antibodies. Fas activation engages a potent and rapid signaling mechanism in a variety of cell types. In the present study, we have investigated the effects of Fas receptor activation on CYP3A4 expression in human colon carcinoma HT-29 cells. The intracellular ceramide levels were significantly enhanced by the treatment with the anti-Fas antibodies and both CYP3A4 protein and mRNA expression was suppressed by Fas activation in a dose-dependent manner. Immunoblot analyses showed that the expression of iNOS protein was significantly stimulated by an anti-Fas antibody treatment in HT-29 cells. Fas receptor activation also increased the generation of reactive oxygen species, and N-acetylcysteine, a well-known antioxidant, could block Fas-mediated iNOS induction. These results show that the Fas receptor-mediated signaling pathways modulate CYP3A4 expression in human colon cancer cells. Overall, iNOS induction and P450 3A4 suppression by Fas activation may cause toxic cellular damage in gastrointestinal tissues.[1]References
- Activation of Fas receptor modulates cytochrome P450 3A4 expression in human colon carcinoma cells. Chun, Y.J., Park, S., Yang, S.A. Toxicol. Lett. (2003) [Pubmed]
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