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The Journal of Immunology, Vol 138, Issue 10 3254-3258, Copyright © 1987 by American Association of Immunologists

ARTICLES

Susceptibility of astrocytes to class I MHC antigen-specific cytotoxicity

DD Skias, DK Kim, AT Reder, JP Antel, DW Lancki and FW Fitch

Cell-mediated immune mechanisms contribute to tissue injury within the central nervous system (CNS) in a number of experimental diseases, including experimental allergic encephalomyelitis and some viral infections, and may mediate lesion formation in multiple sclerosis. We investigated the conditions under which murine astrocytes can become susceptible targets of cytotoxic T cells. We demonstrate that mouse astrocytes in vitro can be susceptible targets of class I major histocompatibility complex (MHC)-specific cytotoxicity mediated by L3 cytotoxic T lymphocytes (CTL). Expression of appropriate class I MHC antigen on the astrocytes is a requirement, because only cells bearing the H-2d phenotype are susceptible to lysis by L3 cells. BALB/c-H-2dm2 astrocytes lacking the specific determinant recognized by L3 cells are not susceptible to lysis. Astrocyte lysis can, however, occur under culture conditions in which MHC antigen expression is immunocytochemically low or undetectable. Cytolysis can be inhibited by pretreatment of the effector L3 cells with either anti-Lyt-2 monoclonal antibody (mAb) or anti-clonotypic mAb and by preincubation of the glial target cells with an appropriate anti-H-2 antibody (anti-H-2Ld). mAb to lymphocyte function-associated antigen does not inhibit cytotoxicity of the L3 clone against glial cells. Knowledge regarding the role of CTL within the CNS, including the surface molecules involved in glial cell lysis, could further the development of immunotherapies designed to effect immune reactivity within the CNS.


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