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Cytokines from peripheral blood mononuclear cells (PBMC) from human T lymphotropic virus (HTLV)-II-infected persons were studied to delineate the mechanism(s) of spontaneous lymphocyte proliferation (SLP). Culturing HTLV-II-infected PBMC that spontaneously proliferate (SLP+) resulted in greater mRNA expression and production of interferon-gamma, interleukin (IL)-4, and IL-5, with a concomitant decrease in IL-10, than was seen with nonproliferating (SLP ) and normal PBMC. While IL-2 mRNA expression was higher, production was lower in SLP+ PBMC than in SLP and normal PBMC, implying that the proliferating cells are utilizing IL-2. Neutralization of IL-2 resulted in partial inhibition, suggesting that other cytokines also affect SLP. Addition of recombinant IL-10 inhibited the proliferation of SLP+ PBMC. Further, blocking costimulatory signals with monoclonal antibodies against CD80/CD86 resulted in increased IL-10 production with concomitant inhibition of SLP. The mechanism(s) underlying HTLV-II-associated SLP in vitro involve increased utilization of IL-2 and down-regulation of IL-10.

the journal of infectious diseases (online. university of chicago press)/the journal of infectious diseases

Down‐Regulation of Interleukin‐10 Expression and Production Is Associated with Spontaneous Proliferation by Lymphocytes from Human T Lymphotropic Virus Type II‐Infected Persons