HDAC1 and HDAC2 collectively regulate intestinal stem cell homeostasis

Area of Science:

• Cell Biology
• Gastroenterology
• Epigenetics

Background:

• Histone deacetylases (HDACs) regulate gene expression through protein deacetylation.
• Broad-spectrum HDAC inhibitors (HDACi) show clinical efficacy but cause side effects.
• Understanding specific HDAC functions is crucial for targeted therapies.

Purpose of the Study:

• To investigate the role of HDAC1 and HDAC2 in intestinal homeostasis.
• To determine the consequences of simultaneous HDAC1 and HDAC2 deletion in adult mouse intestine.
• To explore the impact of HDAC1/HDAC2 loss on intestinal stem cells.

Main Methods:

• Generation of a novel mouse model for inducible, simultaneous deletion of HDAC1 and HDAC2 in the adult intestine.
• In vitro studies using intestinal organoid cultures.
• Treatment of organoids with a class I-specific HDAC inhibitor (MS-275).

Main Results:

• Simultaneous deletion of HDAC1 and HDAC2 rapidly disrupted intestinal homeostasis.
• Intestinal lining was repopulated by surviving stem cells within 8 days.
• In vitro ablation of HDAC1/HDAC2 and MS-275 treatment reduced stem cell markers and clonogenic capacity.

Conclusions:

• HDAC1 and HDAC2 possess redundant functions and are essential for maintaining intestinal homeostasis.
• Loss of HDAC1/HDAC2 function impairs intestinal stem cell function and stemness.
• Findings provide a potential explanation for gastrointestinal side effects of HDAC inhibitors.