Journal
JOURNAL OF IMMUNOLOGY
Volume 207, Issue 9, Pages 2205-2215Publisher
AMER ASSOC IMMUNOLOGISTS
DOI: 10.4049/jimmunol.2100565
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Funding
- American Heart Association [18TPA34170206]
- Department of Health and Human Services/National Institutes of Health [5R21AI142281]
- University of Nebraska-Lincoln Institutional funds
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The discovery of IL-10 over 30 years ago marked the beginning of our understanding of how cytokines regulate immune responses. IL-10 has anti-inflammatory action by suppressing APCs, which indirectly inhibits Th1 cells. Regulatory T cells also play a role in IL-10-mediated suppression.
The discovery of IL-10 more than 30 years ago marked the beginning of our understanding of how cytokines regulate immune responses, based on cross-regulation between Th1 and Th2 cytokines. Although multiple cell types were shown to produce IL-10, its identity as a Th2 cytokine remained strong because it was rigidly associated with Th2 clones in mice, whereas both Th1 and Th2 clones could secrete IL-10 in humans. However, as new Th1/Th2 cell functionalities emerged, antiinflammatory action of IL-10 gained more attention than its inhibitory effect on Th1 cells, which may occur as an indirect consequence of suppression of APCs. This notion is also supported by the discovery of regulatory T cells, whose suppressor functions involve the mediation of IL-10, among other molecules. From this perspective, we discuss the functionalities of IL-10 by highlighting important differences between mice and humans with an emphasis on the Th1 and Th2 paradigm.
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