Research Paper Volume 5, Issue 6 pp 427—444

Figure 1. SUCNR1 is expressed in RPE and microglia and diminishes with age. (A) Immunohistochemistry on sagittal retinal cryosections reveals expression of SUCNR1 in the GCL, INL and RPE. (B-D) Confocal imaging corroborates expression of SUCNR1 (red) in the RPE as confirmed by co-localization with the RPE marker RPE65 (green). Images are representative of 3-4 experiments. (E) Expression profile of Sucnr1 mRNA shows transcripts in RPE and CNS microglia from wild-type mice while an absence of transcripts is noted in samples from Sucnr1−/− mice. (F) Quantitative PCR on RPE isolated from 8, 20 or 43 week old wild-type mice shows a steady decrease of Sucnr1 levels with age (n=4-6). Values are expressed as percentage of controls ± S.E.M., normalized to β-actin standards. ONL: outer nuclear layer, INL: inner nuclear layer, GCL: ganglion cell layer and RPE: retinal pigment epithelium. Scale bars (A-D): 100μm.