Lysophosphatic acid modulates prostaglandin secretion in the bovine endometrial cells differently on days 8-10 of the estrous cycle and early pregnancy.

Lysophosphatidic acid (LPA) is becoming a new player in regulation of the reproductive processes of domestic animals. In the present study, we examined whether LPA modulates prostaglandin (PG) synthesis in the bovine endometrium at the time of the early maternal pregnancy recognition compared with the respective days of the estrous cycle and the enzymatic mechanism of this action. Bovine epithelial and stromal endometrial cells isolated from the uteri on days 8-10 of the estrous cycle and pregnancy were cultured with LPA for 24 h. LPA increased PGE(2) production in stromal cells during the estrous cycle and early pregnancy. On days 8-10 of pregnancy, LPA inhibited PGF(2alpha) production in epithelial cells. LPA stimulated PGES mRNA expression in stromal cells during both examined phases and inhibited PGFS mRNA expression in epithelial cells on days 8-10 of pregnancy. The overall results indicate that LPA may serve as a luteotropic factor during the luteal phase of the estrous cycle and early pregnancy stimulating PGE(2) synthesis and mRNA expression for PGES in stromal cells. Moreover, during early pregnancy, LPA might protect bovine CL and early embryo development by decreasing PGF(2alpha) synthesis and mRNA expression for PGFS in the epithelial cells of the bovine endometrium.