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Investigative Ophthalmology & Visual Science, Vol 35, 189-198, Copyright © 1994 by Association for Research in Vision and Ophthalmology

ARTICLES AND REPORTS

Characterization of monoclonal antibodies recognizing retinal pigment epithelial antigens

JJ Janssen, BP Janssen and AH van Vugt
Institute of Ophthalmology, University of Nijmegen, The Netherlands.

PURPOSE. To purify and characterize retinal pigment epithelial proteins exhibiting uveitogenic characteristics after immunization of Lewis rats, a broad panel of monoclonal antibodies directed against retinal pigment epithelial (RPE) protein antigens, was isolated. METHODS. Bovine RPE detergent extracts were used to isolate monoclonal antibodies against RPE antigens. Species and tissue specificity within the eye was tested through immunocytochemical analysis. Western blot analysis was used to determine the molecular weight of the RPE antigens. RESULTS. Several RPE-reactive antibodies were obtained. At least four monoclonal antibodies were isolated that reacted with different RPE antigen types. Against most of the antigens more than one hybridoma cell line was isolated. Two hybridoma lines were isolated producing antibodies, which on immunocytochemical analysis showed strong reactivity with the RPE and eye muscle tissue. The latter monoclonal antibody recognizes a 32 kD protein in RPE cells. Five monoclonal antibodies recognize a protein with an apparent molecular weight of 65 kD. One cell line was isolated that produced antibodies showing an irregular reaction pattern with both iris and ciliary body. CONCLUSIONS. RPE cells, striated eye muscle and smooth muscle cells share a 32 kD antigenic protein. This antigen is present in almost all ocular epithelial cells. Based on reaction patterns on Western blot and immunocytochemical analysis, there are at least three different 65 kD RPE antigens, two of which are RPE-specific and one of which is also present in the kidney epithelium.


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Copyright © 1994 by the Association for Research in Vision and Ophthalmology