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Expression of P2Y1, P2Y2, P2Y4, and P2Y6 Receptor Subtypes in the Rat Retina

¹From Experimental Ophthalmology, University Eye Hospital, Tübingen, Germany; and the ²Natural and Medical Sciences Institute, University of Tübingen, Reutlingen, Germany.

PURPOSE. To elucidate the expression pattern of different types of metabotropic P2Y receptors in the adult rat retina.

METHODS. Qualitative RT-PCR was used to investigate the expression profile of different P2Y receptor subtypes (P2Y1, P2Y2, P2Y4, and P2Y6), and in situ hybridization studies were performed to show their cellular localization within the retina. Immunohistochemical staining was used to detect the corresponding P2Y proteins (P2Y1, P2Y2, and P2Y4) and their cellular localization. Southern blot analysis and sequencing verified the identity of the P2Y PCR products.

RESULTS. RT-PCR revealed the presence of P2Y1, -2, -4, and -6 mRNA in the neural retina and the retinal pigment epithelium (RPE) and choroid. In situ hybridization showed labeling in the retinal ganglion cell layer for all four P2Y receptor subtypes, although the intensity varied. In addition, staining for P2Y1, -4, and -6 mRNA was shown in the inner nuclear layer, but was absent for the P2Y2 receptor subtype. Immunohistochemistry showed intense staining for P2Y1, -2, and -4 in the ganglion cell layer and the outer plexiform layer. There was also a specific subtype staining in the inner plexiform layer (P2Y2, -4), the inner (P2Y1, -4) and outer (P2Y1) nuclear layers and the inner segments of the photoreceptors (P2Y1, -2).

DISCUSSION. The data suggest that extracellular nucleotides may play complex roles as autocrine–paracrine mediators and may have neuromodulatory effects in the retina through metabotropic P2Y receptors.

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