RelB regulates Th17 differentiation in a cell-intrinsic manner

Area of Science:

• Immunology
• Molecular Biology
• Cell Biology

Background:

• The alternative NF-κB pathway is crucial for lymphoid organogenesis and implicated in hematological malignancies.
• Its precise role in lymphocyte differentiation remains incompletely understood.
• Previous work showed uncontrolled alternative NF-κB activation impairs plasmablast proliferation and T cell-independent responses.

Purpose of the Study:

• To investigate the cell-intrinsic effects of alternative NF-κB hyperactivation on T cell differentiation and function.
• To elucidate the specific role of the NF-κB inhibitory protein p100 in T cell development.

Main Methods:

• Utilized p100-deficient (p100-/-) mice to study T cell responses.
• Performed in vitro assays to assess T helper cell activation and proliferation.
• Evaluated in vivo memory T cell formation and T helper 17 cell polarization.

Main Results:

• p100-deficient T helper cells exhibited impaired activation and proliferation in vitro.
• Memory T cell development was significantly reduced in p100-/- mice.
• p100-/- T cells demonstrated a failure to polarize into T helper 17 cells, linked to increased RelB and decreased RORγt.
• These defects were cell-intrinsic to T cells.

Conclusions:

• RelB functions as a negative regulator of T cell activation and T helper 17 cell differentiation.
• The alternative NF-κB pathway, specifically RelB, plays a critical role in T cell homeostasis.
• Modulating this pathway may offer therapeutic strategies for T helper 17-mediated diseases.