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Isolation and Th17 Differentiation of Naïve CD4 T Lymphocytes
Published on: September 26, 2013
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Interferon-dependent IL-10 production by Tregs limits tumor Th17 inflammation
The Journal of Clinical Investigation
|November 13, 2013
Summary
Interleukin-10 (IL-10) produced by regulatory T cells (Tregs) restrains Th17 inflammation in the tumor microenvironment. Type I interferons (IFN) are crucial for this Treg-mediated suppression, impacting cancer immunotherapy strategies.
Area of Science:
- Immunology
- Cancer Biology
- Tumor Microenvironment
Background:
- Interleukin-10 (IL-10) and regulatory T cells (Tregs) can impair anti-cancer Th1 immunity and suppress Th17 activity, which is linked to poor cancer prognosis.
- Their role in regulating pathogenic cancer-associated inflammation has been understudied.
Purpose of the Study:
- To investigate the origin and function of IL-10-producing cells within the tumor microenvironment.
- To elucidate the regulatory mechanisms controlling Th17 inflammation in cancer.
Main Methods:
- Utilized transplantable tumor models in mice.
- Analyzed the production of IL-10 by different cell populations within the tumor.
- Investigated the role of type I IFN signaling and other inflammatory pathways (MyD88, IL-12) in Treg activation and IL-10 production.
- Assessed the impact of IL-10 and type I IFN on Th17 cell numbers in spleen and tumor.
Main Results:
- The majority of tumor-associated IL-10 was produced by activated Tregs.
- IL-10 production by Tregs was essential for suppressing Th17-type inflammation.
- Accumulation of IL-10+ Tregs in tumors required type I IFN signaling but not MyD88 or IL-12 family cytokines.
- IL-10 limited Th17 cell numbers, while type I IFN specifically controlled tumor-associated Tregs to limit Th17 cells within the tumor microenvironment.
Conclusions:
- A critical interplay exists between type I IFN, Tregs, and IL-10 in negatively regulating Th17 inflammation within the tumor microenvironment.
- Therapeutic targeting of this network may inadvertently promote Th17 inflammation and cancer growth, highlighting the need for careful consideration in cancer immunotherapy development.
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