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Interphotoreceptor retinoid binding protein (IRBP) is a soluble glycolipoprotein located between the neurosensory retina and pigment epithelium, which may serve to transport vitamin A derivatives between these tissues. The specific cell type responsible for IRBP synthesis has not been well established. To address this issue, we have examined the expression of IRBP mRNA in human and cone-dominant ground squirrel retinas by in situ hybridization. Optimal labeling and histological resolution were achieved with 35S- and 3H-labeled anti-sense riboprobes made from a human IRBP cDNA clone, and semi-thin wax-embedded retinal sections. In human retina, label was localized over the inner segments of both rod and cone photoreceptors. Quantitative analysis demonstrated a fourfold higher density of label over rod inner segments. In ground squirrel retina, labeling was found almost exclusively over the inner segments of cones. The results indicate that in human retina both rods and cones express IRBP mRNA, albeit at different levels. In cone-dominant species such as the ground squirrel, cones are the principal cell type responsible for IRBP mRNA synthesis.

Detection of interphotoreceptor retinoid binding protein (IRBP) mRNA in human and cone-dominant squirrel retinas by in situ hybridization.