Abstract
It has been demonstrated that there is difference in the induction of apoptosis in LoVo cells by (−)-epigallocatechin-3-gallate (EGCG), (−)-epigallocatechin (EGC), and (−)-epicatechin (EC). In this study, we explored changes in ceramide levels upon the three catechins-induced apoptosis in LoVo cells. Addition of C 2- and C 6-ceramide to LoVo cells mimicked EGCG or EGC in leading to apoptotic death. Further measurement of intracellular ceramide content showed that the treatment of LoVo cells with EGCG or EGC resulted in a rapidly transient increase in ceramide content, and then back gradually to base line level, whereas the action of EC was just opposite to that of EGCG or EGC. These results suggest there is difference in the generation of intracellular ceramide by the three catechins and ceramide may take part in the regulation of EGCG- or EGC-induced apoptosis in LoVo cells.
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