Altered IL-10 levels in trauma patients' M phi and T lymphocytes.
Trauma results in concomitant immunosuppression and elevated monocyte (M phi) inflammatory cytokine levels. The augmenting or ameliorating effect of IL-10 in septic complications after trauma is controversial. Here, IL-10 levels of trauma patients' and normals' PBMC, isolated M phi, and isolated T cells were assessed and correlated to their PBMC mitogen responses, their T-cell proliferation in an APC independent system, and their M phi production of elevated TNF-alpha levels. Trauma patients with depressed PBMC responses to PHA stimulation also had significantly decreased IL-10 levels in their stimulated PBMC supernates (P = 0.0022) and their MDP-stimulated isolated M phi population (P = 0.0004). However, patients with depressed PHA responses could have either normal or depressed T-cell proliferation in an anti-CD3-, anti-CD4-stimulated system. If APC-independent T-cell proliferation was depressed, induced IL-10 levels were suppressed (P = 0.007). However, if APC-independent T-cell proliferation was normal or elevated, IL-10 levels could be normal or elevated (P = 0.018). Decreased IL-10 levels correlated with depressed mitogen responses and depressed T-cell proliferation. IL-10, therefore, could not be inducing trauma patients' immunosuppression. Patients with elevated M phi TNF-alpha levels had depressed M phi IL-10 levels.
Miller-Graziano
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Department of Surgery, University of Massachusetts Medical Center, Worcester 01655, USA.
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D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002474:Cell-Free System; D015536:Down-Regulation / Q000276:immunology; D005260:Female; D006801:Humans; D007108:Immune Tolerance; D016753:Interleukin-10 / Q000096:biosynthesis / Q000097:blood*; D007963:Leukocytes, Mononuclear / Q000276:immunology / Q000378:metabolism; D008264:Macrophages / Q000276:immunology* / Q000378:metabolism; D008297:Male; D008875:Middle Aged; D013601:T-Lymphocytes / Q000276:immunology* / Q000378:metabolism; D014409:Tumor Necrosis Factor-alpha / Q000378:metabolism; D014947:Wounds and Injuries / Q000097:blood / Q000276:immunology*
D014409:Tumor Necrosis Factor-alpha; D016753:Interleukin-10