The predicted new isoform of PCP2 is expressed in retinal ON bipolar cells. The predicted new isoform of PCP2 is expressed in retinal ON bipolar cells.

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The predicted new isoform of PCP2 is expressed in retinal ON bipolar cells. The predicted new isoform of PCP2 is expressed in retinal ON bipolar cells. A , Western blots of proteins of retinal, cerebellar (cereb), and HEK cells. HEK cells were either untransfected (Un-HEK) or transfected with pcDNA3.1 Ret-PCP2 construct (Tr-HEK). The blot was probed with the antibody we generated against the N terminus region of exon2. PCP2 in extracts from retina and transfected HEK cells migrated with similar mobility, whereas a single band from cerebellum migrated faster. B , Western blots of WT and PCP-null (KO) retinas showed that the 15 kDa PCP2 band was eliminated in the null retina. C , Western blot containing protein lysates from retina and cerebellum as in A probed with an antibody against exon 3, a region common to all PCP2 isoforms. Lysate from cells expressing the large cerebellar form (1B) was included as a control (BAC). Note, only a single band appears in cerebellum and retina. D , Ret-PCP2 was immunoprecipitated with the antibody against the N terminus region of exon 2, isolated by SDS-PAGE and subjected to mass spectrometry (MS/MS) microsequencing analysis. This revealed a Ret-PCP2 unique peptide (shown below the blot) with a score xC = 2.54 (cutoff is 2.5). E , In the wild-type retina, staining for PCP2 localizes to somas high in the INL, whose axons terminate throughout sublamina b of the IPL. Staining in ON bipolar dendrites and axon terminals seemed equally strong. ONL, Outer nuclear layer; OPL, outer plexiform layer; INL, inner nuclear layer; IPL, inner plexiform layer; GCL, ganglion cell layer. F , In null retina, staining for PCP2 was totally eliminated. Ying Xu et al. J. Neurosci. 2008;28:8873-8884 ©2008 by Society for Neuroscience