Class IIa HDAC4 and HDAC7 cooperatively regulate gene transcription in Th17 cell differentiation

Area of Science:

• Immunology
• Molecular Biology
• Epigenetics

Background:

• Class II histone deacetylases (HDACs) regulate gene transcription in T cell development.
• Cell-specific functions of HDACs, particularly Class IIa HDACs, remain largely unknown.
• Understanding these roles is key to deciphering T cell differentiation pathways.

Purpose of the Study:

• To investigate the role of Class IIa HDACs, specifically Hdac4 and Hdac7, in T-helper 17 (Th17) cell differentiation.
• To elucidate the molecular mechanisms by which Hdac4 and Hdac7 regulate Th17 cell lineage commitment.
• To evaluate the therapeutic potential of targeting Hdac4/7 in Th17-mediated inflammatory conditions.

Main Methods:

• Utilized mouse models to study T cell differentiation.
• Employed genetic and pharmacological inhibition of Hdac4/7.
• Analyzed gene transcription and protein interactions, including TF binding assays.
• Assessed Th17 cell function in a colitis model.

Main Results:

• Hdac4 and Hdac7 are selectively induced during Th17 cell differentiation from naive CD4+ T cells.
• Hdac4 interacts with JunB to activate Th17 signature genes (e.g., Il17a/f).
• Hdac7 collaborates with Aiolos and Ncor1-Hdac3 to repress Th17 negative regulators (e.g., Il2).
• Inhibition of Hdac4/7 ameliorates Th17-mediated intestinal inflammation in a colitis model.

Conclusions:

• HDAC4 and HDAC7 play distinct yet cooperative roles in regulating gene transcription during Th17 cell differentiation.
• Targeting HDAC4/7 offers a potential therapeutic strategy for Th17-related inflammatory diseases, including ulcerative colitis.