PMID: 9174644Jan 1, 1997Paper

Pathogenesis of chronic progressive myelopathy associated with human T-cell lymphotropic virus type I

Acta Neurologica Scandinavica. Supplementum
P Höllsberg

Abstract

Human T-cell lymphotropic virus type I (HTLV-I) induces a chronic demyelinating disease known as HTLV-I-associated myelopathy/tropical spastic paraparesis (HAM/TSP). While only 0.25% of HTLV-I-infected individuals develop HAM/TSP, the mechanisms responsible for the progression of an HTLV-I carrier state to clinical disease are not clear. In particular, no specific sequence differences have been found between HTLV-I recovered from HAM patients and HTLV-I-infected carriers. Since CD4 T cells are the major reservoir of the virus, at least three hypotheses implicating CD4 T cells directly or indirectly have been proposed: 1) The cytotoxic hypothesis predicts that activated and HTLV-I-infected CD4 T cells migrate to the CNS and infect resident cells. Cytotoxic CD8 T cells may then recognize viral antigens on HTLV-I-infected CNS cells causing a cellularly mediated cytotoxic demyelination. 2) The autoimmune hypothesis predicts that either (a) virally reactive T cells crossreact with a CNS antigen, or (b) random infection of CD4 T cells eventually results in the infection of CNS-autoreactive CD4 T cells that, by virtue of the productive HTLV-I infection, become activated, expand and migrate to the CNS, where they encounter their antige...Continue Reading

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Sep 5, 2002·Microbiology and Molecular Biology Reviews : MMBR·Björn Albrecht, Michael D Lairmore
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