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Immune cells from the adaptive compartment are involved in disease manifestation but whether innate cell functions participate in disease occurrence has not been evaluated. In this study, we analyzed innate cell responses at steady state and after blood cell stimulation using an agonist of the toll-like receptor (TLR)7\/8-signaling pathway in blood samples from HTLV-1-infected volunteers, including asymptomatic carriers and HAM\/TSP patients. We observed a lower response of IFN\u03b1<jats:sup>+<\/jats:sup> DCs and monocytes in HAM\/TSP compared to asymptomatic carriers, as a potential consequence of corticosteroid treatments. In contrast, a higher frequency of monocytes producing MIP-1\u03b1 and pDC producing IL-12 was detected in HAM\/TSP blood samples, together with higher IFN\u03b3 responsiveness of NK cells, suggesting an increased sensitivity to inflammatory response in HAM\/TSP patients compared to asymptomatic carriers. This sustained inflammatory responsiveness could be linked or be at the origin of the neuroinflammatory status in HAM\/TSP patients. Therefore, the mechanism underlying this dysregulations could shed light onto the origins of HAM\/TSP disease.<\/jats:p>","DOI":"10.1371\/journal.pntd.0009940","type":"journal-article","created":{"date-parts":[[2021,11,12]],"date-time":"2021-11-12T18:36:21Z","timestamp":1636742181000},"page":"e0009940","update-policy":"https:\/\/doi.org\/10.1371\/journal.pntd.corrections_policy","source":"Crossref","is-referenced-by-count":6,"title":["Immunoprofiling of fresh HAM\/TSP blood samples shows altered innate cell 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