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Isolation and Th17 Differentiation of Naïve CD4 T Lymphocytes
Published on: September 26, 2013
Th17 cells in immunity and autoimmunity
1Center for Neurologic Diseases, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA. moukka@rics.bwh.harvard.edu
Annals of the Rheumatic Diseases
|December 17, 2008
Summary
Interleukin 6 (IL6) promotes inflammatory Th17 cells while suppressing regulatory T-reg cells. This cytokine balance is crucial for controlling autoimmune diseases and maintaining immune homeostasis.
Area of Science:
- Immunology
- T cell differentiation
- Autoimmune diseases
Background:
- T helper 17 (Th17) cells clear extracellular pathogens but also drive inflammation in autoimmune conditions.
- Regulatory T (T-reg) cells maintain immune tolerance by suppressing autoreactive T cells.
- Transforming growth factor beta (TGF-beta) promotes T-reg cell generation, while IL-6 and TGF-beta induce pathogenic Th17 cells.
Purpose of the Study:
- To elucidate the role of Interleukin 6 (IL6) in balancing T-reg and Th17 cell differentiation.
- To understand the molecular mechanisms underlying Th17 cell-mediated inflammation and autoimmune pathogenesis.
Main Methods:
- Analysis of T cell differentiation pathways influenced by TGF-beta and IL6.
- Investigation of the reciprocal relationship between T-reg and Th17 cells.
- Utilizing IL6-deficient (IL6-/-) mouse models to study immune cell populations.
Main Results:
- TGF-beta promotes the generation of induced T-reg (iT-reg) cells, complementing naturally occurring T-reg (nT-reg) cells to control autoreactivity.
- IL6, produced during inflammation, inhibits T-reg cell function and promotes Th17 cell differentiation.
- IL6-/- mice exhibit impaired Th17 cell development and elevated T-reg cell numbers, confirming IL6's pivotal role.
Conclusions:
- IL6 is a critical determinant of the balance between pro-inflammatory Th17 cells and immunosuppressive T-reg cells.
- Dysregulation of the IL6-mediated balance contributes to the pathogenesis of autoimmune and inflammatory diseases.
- Targeting the IL6 pathway may offer therapeutic strategies for inflammatory and autoimmune conditions.
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