Control of cell proliferation via transduction of sPLA2‐I activity and possible PPAR activation at the nuclear level

Pancreatic phospholipase A2 (PLA2-I) stimulates UIII cells proliferation, a rat uterine cell line, after binding to membrane receptors, internalization and translocation. Here, we demonstrate that during these steps of internalization, PLA2-I retains its hydrolytic activity and thus could exert its proliferative effect via nuclear phospholipids hydrolysis. Since fatty acids and eicosanoids released by such activity are known to be ligands of PPAR, we study the expression of these nuclear receptors and demonstrate that, in the experimental conditions where PLA2-I stimulates UIII cells proliferation, PLA2-I also regulates PPAR expression indicating a possible mechanism of its proliferative effect.