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Characterization of a monoclonal antibody (SBU-1) made to the thymic rudiment of sheep

TR White, CS Lee, P French, D Hewish and MR Brandon

A monoclonal antibody (SBU-1) was raised to sheep thymic rudiment by fusion of NSI myeloma cells with spleen cells from BALB/c mice immunized with thymic rudiment isolated from fetal sheep between 25-30 days of gestation. By employing the indirect immunoperoxidase technique the antigen recognized by SBU-1 was found to be present in the epithelial reticular cells of the fetal sheep thymus. The intensity of staining decreased as gestation progressed. In the adult thymus the antigen was mainly restricted to Hassall's corpuscles and occasional epithelial cells in the medulla. In addition, the antigen was also shown to be present in epithelial cells of the small intestine, the bronchiole, the keratinized epithelium of the rumen, and the epithelial cells of the kidney tubules. By use of immunofluorescence the antigen was shown to be present in most of the cells of wool follicles and the cortex of developing wool fibers. Western blotting of SBU-1 against the low-sulfur alpha-keratin proteins of wool confirmed that the antigen recognized by SBU-1 belongs to a family of keratins. It was concluded that SBU-1 was raised against alpha-keratin expressed by the epithelial cells of the thymic rudiment and that the expression of this antigen on the reticular network of the thymus declined with advancement of pregnancy.

Volume 33, Issue 8, pp. 785-790, 08/01/1985
Copyright © 1985 by The Histochemical Society


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