An immunoelectron microscopical study of the expression of class II major histocompatibility complex during chronic relapsing experimental allergic encephalomyelitis in Biozzi AB/H mice.

Immunoelectron microscopical techniques have been used to study class II major histocompatibility complex (MHC) expression by cells in the spinal cords of Biozzi AB/H mice with chronic relapsing experimental allergic encephalomyelitis. Throughout the course of disease both astrocytes and endothelia failed to express significant levels of class II MHC antigens. The major central nervous system resident cell types found to express class II MHC antigens were the perivascular microglia, with infiltrating macrophages and some lymphocytes being strongly positive.