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Journal of Histochemistry and Cytochemistry, Vol. 46, 185-192, Copyright © 1998 by The Histochemical Society, Inc.

ARTICLE

ß-Dystroglycan Localization in the Photoreceptor and Müller cells in the Rat Retina Revealed by Immunoelectron Microscopy

Hideho Uedaa, Takashi Gohdob, and Shinichi Ohnoa
a Department of Anatomy, Yamanashi Medical University, Yamanashi, Japan
b Department of Ophthalmology, Yamanashi Medical University, Yamanashi, Japan

Correspondence to: Hideho Ueda, Dept. of Neurosciences-NC30, the Cleveland Clinic Foundation, 9500 Euclid Ave., Cleveland, OH 44195.

ß-Dystroglycan (ß-DG) is a dystrophin-associated glycoprotein that is expressed in skeletal muscle and other tissues. In the retina, dystrophin is present in the outer plexiform layer (OPL), where it is enriched under the photoreceptor cell membrane. In this study we determined the immunocytochemical localization of ß-DG at both light and electron microscopic levels. ß-DG immunoreactivity was detected at the inner limiting membrane, OPL, and around blood vessels. Immunoelectron microscopy detected ß-DG immunoreactive products under the photoreceptor cell membrane, which are the same regions of dystrophin localization. In addition, ß-DG was detected under the Müller cell membrane that is attached to the paravitreous or perivascular basement membrane. Our results suggest that ß-DG may interact with dystrophin in photoreceptor membranes. However, ß-DG-related interactions between Müller cells and basement membranes appear to be independent of dystrophin and raise the possibility that ß-DG interacts with other molecules. We speculate that ß-DG plays a role in maintaining the structural relationship between photoreceptor and bipolar cells or between Müller cells and basement membranes. (J Histochem Cytochem 46:185—191, 1998)

Key Words: ß-dystroglycan, photoreceptor cell, Müller cell, immunoelectron microscopy


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