Detection of interphotoreceptor retinoid binding protein (IRBP) mRNA in human and cone-dominant squirrel retinas by in situ hybridizationK Porrello, SP Bhat and D Bok Jules Stein Eye Institute, University of California, Los Angeles School of Medicine 90024. 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.
Volume 39,
Issue 2,
pp. 171-176,
02/01/1991
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T. Sakai, J. B. Calderone, G. P. Lewis, K. A. Linberg, S. K. Fisher, and G. H. Jacobs Cone Photoreceptor Recovery after Experimental Detachment and Reattachment: An Immunocytochemical, Morphological, and Electrophysiological Study Invest. Ophthalmol. Vis. Sci., January 1, 2003; 44(1): 416 - 425. [Abstract] [Full Text] [PDF] |
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L. L. Cunningham and F. GonzalezFernandez Coordination between Production and Turnover of Interphotoreceptor Retinoid-Binding Protein in Zebrafish Invest. Ophthalmol. Vis. Sci., October 1, 2000; 41(11): 3590 - 3599. [Abstract] [Full Text] |
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V. Arranz, C. Dreuillet, P. Crisanti, J. Tillit, M. Kress, and M. Ernoult-Lange The Zinc Finger Transcription Factor, MOK2, Negatively Modulates Expression of the Interphotoreceptor Retinoid-binding Protein Gene, IRBP J. Biol. Chem., April 6, 2001; 276(15): 11963 - 11969. [Abstract] [Full Text] [PDF] |
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