Abstract
The effects of cholestane 3 beta,5 alpha,6 beta-triol on intestinal epithelial crypt cells were investigated using the IEC-6 cell line. Cholestane 3 beta,5 alpha,6 beta-triol decreased SH groups (glutathione and protein SH) in the cell, and showed cytotoxicity in a time-dependent manner. Although the concentration of cholestane 3 beta,5 alpha,6 beta-triol used in this study (100 microM) was very high compared with that in plasma of experimental animals, cholestane 3 beta,5 alpha,6 beta-triol did not show any cytotoxicity on IEC-6 cells without fetal calf serum (FCS). The level of cytotoxicity was dependent upon the concentration of FCS in the culture medium. Unknown components in FSC (not VLDL or LDL) were suggested to be associated with the cytotoxicity of cholestane 3 beta,5 alpha,6 beta-triol. Moreover, the fact that even heat-treated FCS (100 degrees C for 30 min) still mediated the cytotoxicity suggested the participation of non-protein components.
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