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Dystrobrevin localization in photoreceptor axon terminals and at blood-ocular barrier sites.

Authors: Ueda, H  Baba, T  Kashiwagi, K  Iijima, H  Ohno, S 
Citation: Ueda H, etal., Invest Ophthalmol Vis Sci. 2000 Nov;41(12):3908-14.
Pubmed: (View Article at PubMed) PMID:11053293

PURPOSE: Dystrobrevin is a newly discovered dystrophin-associated protein with multiple sites for phosphorylation on tyrosine residues. In the present study, the cellular distribution and subcellular localization of dystrobrevin were examined in the adult rat retina, cornea, lens, iris, ciliary body, and cultured Muller cells. METHODS: Immunoblot analysis, confocal laser scanning microscopy, and immunoelectron microscopy were used to examine dystrobrevin expression. RESULTS: Immunoblot analysis showed that an approximately 87-kDa band was expressed predominantly in the lens, retina, iris and ciliary body, whereas an approximately 60-kDa band was expressed in cultured Muller cells, cornea, retina, iris, and ciliary body. Confocal microscopy demonstrated dystrobrevin in the inner limiting membrane, outer plexiform layer, and retinal pigment epithelium and around blood vessels in the retina. At the ultrastructural level, dystrobrevin was localized under cell membranes of rod spherules and cone pedicles of photoreceptor cell terminals but often was found in the cytoplasm of endothelial cells and Muller cells. Furthermore, dystrobrevin was colocalized with beta-dystroglycan in corneal endothelium; lens, iris, and ciliary epithelia; and cultured Muller cells. CONCLUSIONS: The present study demonstrates that dystrobrevin is expressed in neurons, glia, and endothelial cells in the rat retina. In addition, dystrobrevin is localized at the blood-ocular barrier sites in extraocular tissue. These data suggest that dystrobrevin plays an important role in visual function.

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CRRD Object Information
CRRD ID: 1581690
Created: 2006-10-18
Species: All species
Last Modified: 2006-10-18
Status: ACTIVE



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