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American Journal of Pathology, Vol 137, 789-800, Copyright © 1990 by American Society for Investigative Pathology

REGULAR ARTICLES

Intrathecal application of interferon gamma. Progressive appearance of MHC antigens within the rat nervous system

K Vass and H Lassmann
Neurological Institute, University of Vienna, Austria.

Intrathecal injection of interferon-gamma induced a significant increase of the number of class I and class II major histocompatibility complex (MHC)-expressing cells within the rat nervous system. A progressive appearance of MHC-antigen-positive cells was found by light- and electron microscopic immune histology. The first level comprised cells that constitutively expressed MHC antigens in normal animals (meningeal and endoneural monocytes, some perivascular dendritic cells, and few parenchymal microglia cells, especially in the lumbar spinal cord and in the cerebellar white matter). The second level represented cells readily expressing MHC antigens after stimulation with interferon- gamma (all perivascular, dendritic cells, and microglia). The third level included ependymal cells, astrocytes, and Schwann cells. After stimulation with interferon-gamma, these neuroectodermal cells expressed MHC antigens inconsistently, usually in a low density and patchy distribution. The progressive appearance of MHC antigens may be reflected by the variances of lesional patterns found in experimental allergic encephalomyelitis of different histologic severity.

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