Lysophosphatidic acid-induced nuclear localization of protein kinase C delta in bovine theca cells stimulated with luteinizing hormone.

The amounts of lysophospholipase D (LPLD) and the ovarian protein kinase C delta increase during the course of pregnancy. Because LPLD is involved in the production of the bioactive phospholipid lysophosphatidic acid (LPA), we examined whether stimulation with LPA would influence in the ovary. We used immunoblotting and immunohistochemical methods to show that stimulation of bovine theca cells with LPA leads to an unexpected redistribution of duanyu1531delta from the cytosol to the perinuclear area and that in the presence of LH, LPA induces a complete nuclear translocation of These effects of LPA are dose dependent, can be mimicked by phorbol ester, and are inhibited by a duanyu1531delta inhibitor, rottlerin. Concomitantly, under the same experimental conditions both LPA and the phorbol ester PMA (4beta-phorbol-12-myristate-13-acetate) augment LH-stimulated progesterone accumulation in this cell system. This functional effect of LPA and PMA is abolished in cells pretreated with rottlerin. It is unclear whether the nuclear localization of duanyu1531delta indicates a specific function of the enzyme in the bovine ovary. Because duanyu1531delta supports a luteotropic function in rodent models, a similar role in the bovine ovary is also likely.

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