alexa [Immunopathogenesis and treatment of the myelopathy associated to the HTLV-I virus].
Psychiatry

Psychiatry

Journal of Addiction Research & Therapy

Author(s): CarodArtal FJ

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Abstract INTRODUCTION: Human T-cell lymphotropic virus type-I (HTLV-I) causes tropical spastic paraparesis/HTLV-I associated myelopathy (TSP/HAM). Immunopathogenesis and available treatments for TSP/HAM are reviewed. DEVELOPMENT: At least 20 million people are infected worldwide and 0.3-4\% will develop TSP/HAM. Incidence in endemic areas is around 2 cases/ 100,000 inhabitants and year. The 50\% of TSP/HAM patients suffer from clinical progression during their first ten years. Progression is associated with high proviral load and ager than 50 years at onset. HTLV-I proviral DNA and m-RNA load are significantly raised in TSP/HAM patients compared to asymptomatic carriers. This antigenic load activates T cells CD8+ specific for Tax-protein, which up-regulate pro-inflammatory cytokines. Corticoids, plasma-exchange, intravenous immunoglobulins, danazol, pentoxifilline, green-tea polyphenols, lactobacillus fermented milk, zidovudine, lamivudine, monoclonal antibodies (daclizumab), interferon, and valproic acid have been used in open trials in a small number of patients. Nevertheless, their clinical efficacy is limited. Interferon alpha and beta-1a have cytostatic properties and may cause a reduction in HTLV-I proviral load. CONCLUSIONS: High HTLV-I proviral load and an exaggerated pro-inflammatory cellular response are involved in the pathogenesis of TSP/HAM. No therapy has been conclusively shown to alter long-term disability associated with TSP/HAM. Multicentric clinical trials are necessary to assess long-term efficacy of interferon in TSP/HAM.
This article was published in Rev Neurol and referenced in Journal of Addiction Research & Therapy

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