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A Two-Step Process of Effector Programming Governs CD4+ T Cell Fate Determination Induced by Antigenic Activation in
Adeleye Opejin1, Alexey Surnov1, Ziva Misulovin2
1Department of Molecular Microbiology and Immunology, Saint Louis University School of Medicine, St. Louis, MO, USA.
Cell Reports
|November 25, 2020
Summary
Effector T cell programming is an integral part of immune response, initiated by antigen exposure. This process involves specific molecular circuits and is influenced by dendritic cells and mTORC1 signaling.
Area of Science:
- Immunology
- Cell Biology
- Molecular Biology
Background:
- Immune tolerance is maintained by various processes, yet effector T cells emerge under minor homeostatic disruptions.
- The precise mechanisms driving effector T cell generation during steady-state immune conditions remain unclear.
Purpose of the Study:
- To investigate the mechanisms underlying effector T cell programming during steady-state immune activation.
- To elucidate the role of specific molecular pathways and cell types in T cell fate determination.
Main Methods:
- Analysis of T cell differentiation pathways upon antigenic activation.
- Investigation of Hopx expression and its role in effector precursor programming.
- Assessment of interferon-gamma and T-bet expression in T cell differentiation.
- Evaluation of the impact of cDC2 and mTORC1 on effector precursor induction and pTreg cell generation.
Main Results:
- Effector programming is an integral part of T cell fate determination, initiated by antigenic activation in the steady state.
- A two-step process involving Hopx-expressing precursors dictates terminal effector differentiation.
- Programmed expression of interferon-gamma promotes T-bet expression, driving differentiation.
- Effector programming correlates with regulatory T cell conversion, with cDC2 and mTORC1 modulating this balance.
Conclusions:
- Effector T cell programming is a fundamental process during steady-state immune responses, not solely a response to perturbations.
- Specific molecular circuits, including Hopx, IFN-γ, and T-bet, govern effector differentiation.
- Conventional type 2 dendritic cells and mTORC1 signaling play critical roles in balancing effector and regulatory T cell populations.
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