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Epithelial heterogeneity in the murine thymus: a cell surface glycoprotein expressed by subcapsular and medullary epithelium
A Farr, A Nelson, J Truex and S Hosier
Department of Biological Structure, University of Washington, Seattle 98195.
A monoclonal antibody (MAb), G8.8, was raised against glycoconjugates isolated from a cloned line of murine medullary thymic epithelial cells. Flow cytometric analysis of the reactivity of this MAb with cultured thymic epithelium demonstrated that the ligand was expressed on the cell surface. Immunohistochemical examination of normal murine thymus revealed labeling of cells in the subcapsular and medullary areas. Immunoelectron microscopy revealed surface labeling restricted to cells possessing ultrastructural features of epithelium (desmosomes, tonofilaments, and cytoplasmic cysts). During thymic ontogeny, G8.8+ cells predominated in fetal development at the earliest time point examined (Day 14 of gestation). There was an expansion of the cortical epithelial component so that by Day 18 cortical and medullary compartments could be clearly distinguished. Immunoprecipitation of radioiodinated thymic stroma with MAb G8.8 detected a molecule with an apparent Mr of approximately 38 KD under non-reducing conditions. When reduced, the apparent Mr was slightly increased (42 KD). This MAb also exhibited reactivity with gut and epidermal epithelium and some tubular epithelium in the kidney, but did not react with epithelial parenchymal cells of the liver.
Volume 39,
Issue 5,
pp. 645-653,
05/01/1991
Copyright © 1991 by The Histochemical Society
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