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Intracellular localization of thymosin alpha 1 by immunoelectron microscopy using a monoclonal antibody

C Auger, C Stahli, N Fabien and JC Monier

Distribution of thymosin alpha 1 in normal mice (OF1) or autoimmune mice (NZB) was investigated using immunocytochemical techniques on sections of GMA- and Epon-embedded mouse thymuses. A monoclonal antibody directed against synthetic thymosin alpha 1 was used. With the immunofluorescence assay, patchy staining of thymosin alpha 1 was found in the cytoplasm of epithelial cells of the subcapsullary and medullary zones of OF1 thymus. In NZB thymus, the fluorescent pattern was less precisely localized. At the electron microscopic level, immunolabeling of Epon-embedded ultra-thin sections revealed ferritin in some vacuoles of epithelial cells. Ferritin labeling in OF1 thymus was found in several small vacuoles of the same cell, but was present in large, dense vacuoles in NZB thymus. These differences might reflect differences in the secretory process of thymic hormone.

Volume 35, Issue 2, pp. 181-187, 02/01/1987
Copyright © 1987 by The Histochemical Society


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[Abstract] [Full Text]



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