Calcium-independent phospholipase A2 regulates retinal pigment epithelium proliferation and may be important in the pathogenesis of retinal diseases.

M Kolko, J F Kiilgaard, J Wang, K A Poulsen, J R Andreasen, M la Cour, M H Nissen, S Heegaard, N G Bazan, J U Prause

Department of Neuroscience and Pharmacology, Eye Pathology Section, University of Copenhagen, Frederik d. V's vej 11, 1st floor, 2100 Copenhagen, Denmark. mkolko@dadlnet.dk

Experimental eye research 2009 Sep

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Calcium-independent phospholipase A2, group VIA (iPLA2-VIA) is involved in cell proliferation. This study aimed to evaluate the role of iPLA2-VIA in retinal pigment epithelium (RPE) cell proliferation and in retinal diseases involving RPE proliferation. A human RPE cell line (ARPE-19) was used to explore this role in vitro. Proliferating ARPE-19 cells had increased expression and activity of iPLA2-VIA. iPLA2-VIA was found in the nuclei of proliferating ARPE-19 cells, whereas in confluent ARPE-19 cells, with limited proliferation, iPLA2-VIA was primarily found in the cytosol. Inhibition of iPLA2-VIA decreased the rate of proliferation, whereas over expression of iPLA2-VIA increased the rate of proliferation. Using an experimental porcine model of RPE proliferation we demonstrated significant nuclear upregulation of iPLA2-VIA in proliferating RPE cells in vivo. We furthermore evaluated the expression of iPLA2-VIA in proliferative vitreoretinopathy (PVR). PVR membranes revealed nuclear expression of iPLA2-VIA in the RPE cells which had migrated and participated in the formation of the membranes. Overall, the present results point to an important role of iPLA2-VIA in the regulation of RPE proliferation suggesting that iPLA2-VIA may be considered as a possible pharmaceutical target in retinal diseases involving RPE proliferation and migration.

Citation

M Kolko, J F Kiilgaard, J Wang, K A Poulsen, J R Andreasen, M la Cour, M H Nissen, S Heegaard, N G Bazan, J U Prause. Calcium-independent phospholipase A2 regulates retinal pigment epithelium proliferation and may be important in the pathogenesis of retinal diseases. Experimental eye research. 2009 Sep;89(3):383-91