Is rhodopsin the ligand for receptor-mediated phagocytosis of rod outer segments by retinal pigment epithelium?
Exp Eye Res
; 46(1): 21-8, 1988 Jan.
Article
em En
| MEDLINE
| ID: mdl-2830126
ABSTRACT
It has been suggested that rhodopsin may have a direct role in the attachment of shed rod outer segments (ROS) to retinal pigmented epithelial (RPE) cells initiating the events which lead to engulfment. We isolated the soluble tryptic glycopeptide from rhodopsin (GP-T1) and used it as a probe to test this hypothesis. In phagocytic assays using both cultured chick and cat RPE cells, GP-T1 did not inhibit the phagocytosis of ROS. Additionally, mannose glycoconjugates were not effective inhibitors of phagocytosis. However, glycopeptides released by tryptic digestion of intact ROS did inhibit ROS uptake by the RPE cells. The results suggest that phagocytosis of ROS is not mediated through a simple carbohydrate recognition system and that rhodopsin is not the ligand recognized by RPE cells.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Fagocitose
/
Células Fotorreceptoras
/
Epitélio Pigmentado Ocular
/
Pigmentos da Retina
/
Rodopsina
/
Segmento Externo da Célula Bastonete
/
Albumina Sérica
Limite:
Animals
Idioma:
En
Revista:
Exp Eye Res
Ano de publicação:
1988
Tipo de documento:
Article