Restricted accessResearch articleFirst published online 2018-04
Role of Integrin Signaling Activation on the Development of Human T Cell Leukemia Virus-1 (HTLV-1)-Associated Myelopathy/Tropical Spastic Paraparesis: Its Relationship to HTLV-1-Infected CD4 + T Cell Transmigrating Activity into the Tissues
The main clinical feature of human T cell leukemia virus-1 (HTLV-1)-associated myelopathy/tropical spastic paraparesis (HAM/TSP) is slowly progressive spastic paraparesis with bladder dysfunction. HAM/TSP is induced by chronic inflammation in the spinal cord, mainly the lower thoracic cord. A long-standing bystander mechanism, such as the destruction of surrounding tissues by the interaction between infiltrated Th1-like, HTLV-1-infected CD4+ T cells and HTLV-1-specific CD8+ cytotoxic T cells (CTL), is probably critical for the induction of chronic inflammation. Although the HTLV-1-infected CD4+ T cells in HAM/TSP appear to play a crucial role in the initial pathogenesis of HAM/TSP, the exact mechanisms of how these cells acquire their function as the first responders in the pathogenesis of HAM/TSP still remain unresolved. Herein, we propose the importance of the activation of both outside-in signals from integrin signaling and inside-out signals for integrin signaling in the HTLV-1-infected CD4+ T cells of HAM/TSP patients.
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