Abstract
In a previous study, we showed that, of a group of lipids including arachidonic acid (AA), prostaglandins E2 (PGE2) and A2 (PGA2), PGA2 had the most marked effect on the inhibition of cell growth, activation of tyrosine kinase activity, lowering of the number of G1-phase cells, and induction of p53 levels in oesophageal carcinoma (WHCO3) cells17. No significant effects by the three lipids were seen in normal monkey kidney cells. In the present study, the effects of the inhibitor of ceramide synthesis, fumonisin B1(FB1), a metabolite ofFusarium verticillioides (=F.moniliforme) which is implicated in the high incidence of oesophageal cancer, were determined on AA, PGE2 and PGA2 WHCO3 treated cells. In the presence of FB1, the lipid-enhanced tyrosine kinase activity was lowered. Flow cytometric and morphological studies showed that FB1lowered the marked apoptosis induced by especially PGA2. FB1, however, in combination with AA, PGE2 or PGA2 increased the number of G2/M cells. AA⪢PGE2⪢PGA2 alone decreased CDC2-kinase activity, but, in the presence of FB1, CDC2-kinase activity was significantly increased. The PGA2- and AA-induced p53 levels were lowered in the presence of FB1. We concluded that FB1diminished the cytotoxic effects of the lipids on oesophageal tumour cells.
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