CHARACTERIZATION OF HUMORAL AND CELLULAR-IMMUNITY IN THE CENTRAL-NERVOUS-SYSTEM OF HAM TSP/

In HTLV-I-associated myelopathy or tropical spastic paraparesis (HAM/T SP) immunopathological processes in the central nervous system (CNS) h ave not been clarified. We compared the humoral and cellular immunity within the CNS and in the systemic circulation of 24 patients with HAM /TSP (8 men and 16 women) to 6 asymptomatic HTLV-I carriers, 7 patient s with active multiple sclerosis, 6 patients with acute viral encephal itis, and 39 patients with other non-inflammatory neurological disease s. Significant differences were observed between the HAM/TSP patients and one or more of the control groups: HAM/TSP cerebrospinal fluids (C SF) exhibited higher levels of IgG, IgG index, de novo IgG synthesis r ate, and beta(2)-microglobulin, and also a predominance of CD8(+) cell s that expressed CD11a and CD45RO but lacked CD28 antigens. Results in the 6 patients with acute viral encephalitis suggested that the CD8() population in the CSF which is positive for CD28 and CD45RO is impor tant for the elimination of virus from infected CNS tissues. Therefore , potentially cytotoxic T cells of a unique CD8(+)CD11a(+)CD45RO(+)CD2 8(-) phenotype may play a key role in the CNS pathogenesis of HAM/TSP.