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  • Title: Increased osteopontin expression in HTLV-1-associated myelopathy/tropical spastic paraparesis (HAM/TSP) patient cells is associated with IL-17 expression.
    Author: Sarkis S, Belrose G, Peloponese JM, Olindo S, Césaire R, Mesnard JM, Gross A.
    Journal: J Clin Virol; 2013 Sep; 58(1):295-8. PubMed ID: 23756056.
    Abstract:
    BACKGROUND: HTLV-1-associated myelopathy/tropical spastic paraparesis (HAM/TSP) is a neurological inflammatory disease associated with a predominant infiltration of CD4+ T lymphocytes, which are the main subset of HTLV-1-infected cells. It has been demonstrated that in cell line the viral Tax protein transcriptionnally regulate expression of osteopontin, an inflammatory cytokine associated with Th17-related pathologies. OBJECTIVES: The aim of the study was to explore osteopontin expression in HTLV-1 asymptomatic carriers and in HAM/TSP patients and consequences on IL17 expression. STUDY DESIGN: We quantified Tax, osteopontin, RORγ, IL17 and IL22 mRNA expressions in cells from 10 HAM/TSP patients, 6 asymptomatic HTLV-1 carriers (ASY) and 4 HTLV-1-negative healthy donors during ex vivo culture. RESULTS: We observed that the expression of osteopontin was higher in HAM/TSP patients and correlated with Tax expression levels. Positive regulation of RORγ, IL17 and IL22 were also observed during cell culture. CONCLUSIONS: Our results propose a new mechanism which could contribute to HAM/TSP pathogenesis.
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