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  3. Dynamic Foxp3-chromatin Interaction Controls Tunable Treg Cell Function.
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  3. Dynamic Foxp3-chromatin Interaction Controls Tunable Treg Cell Function.

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Dynamic Foxp3-chromatin interaction controls tunable Treg cell function.

Minghong He1, Xinying Zong1, Beisi Xu2

  • 1Department of Immunology, St. Jude Children's Research Hospital, Memphis, TN, USA.

The Journal of Experimental Medicine
|June 27, 2024

View abstract on PubMed

Summary
This summary is machine-generated.

Nuclear factor Foxp3

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Area of Science:

  • Immunology
  • Molecular Biology
  • Cell Biology

Background:

  • The precise mechanisms by which Nuclear factor Forkhead box protein 3 (Foxp3) regulates regulatory T (Treg) cell function remain incompletely understood.
  • Foxp3 is crucial for Treg cell-mediated suppression of autoimmunity and antitumor immune responses.

Purpose of the Study:

  • To elucidate the context-dependent gene regulatory mechanisms employed by Foxp3 in Treg cells.
  • To investigate how Foxp3-chromatin interactions are modulated by cellular activation states and the microenvironment.

Main Methods:

  • Proteomics to identify proteins interacting with Foxp3 upon stimulation.
  • Pharmacological inhibition and genetic knockdown of key transcription factors (NFAT, Batf).
  • Analysis of Foxp3-chromatin association under various conditions, including mutations in the Foxp3 DNA-binding domain.

Main Results:

  • Foxp3-chromatin binding is dynamic, influenced by Treg activation, tumor microenvironment, and specific stimulations (antigen, cytokines).
  • NFAT and Batf are essential for enhanced Foxp3-chromatin binding in activated and tumor-infiltrating Treg cells.
  • Foxp3 DNA-binding domain integrity is critical for stable chromatin association.

Conclusions:

  • Foxp3 dynamically regulates Treg cell function by interacting with chromatin in a context-dependent manner.
  • Treg activation and microenvironmental cues facilitate Foxp3 chromatin association, potentially by co-opting existing DNA-binding proteins, stabilized by direct DNA binding.
  • This dynamic interaction allows Treg cells to adapt their function based on immunological signals.