Abstract
The existence of a subpopulation of rat glomerular cells bearing Ia determinants has been demonstrated with the aid of techniques for the enzymatic isolation and culture of glomerular cells. The Ia-positive cell is normally resident in the uninflamed glomerulus. It resembles a mononuclear phagocyte and consists of a functionally heterogeneous cell population with the capacity of Fc receptor display and phagocytosis, both in vivo and in vitro. A new technique for labeling these cells in situ in intact glomeruli has indicated that Ia-positive cells make up approximately 2% of the total glomerular cell population. The isolated glomerular cells can take up antigen and stimulate immune lymphocytes in an I-region-restricted interaction. They are strongly stimulatory in an allogeneic primary mixed lymphocyte culture. Characterization of this cell type suggests potential new insights into the pathogenesis of renal allograft rejection and immunologically mediated glomerulonephritis.
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