Histone deacetylase inhibition impairs normal intestinal cell proliferation and promotes specific gene expression

Area of Science:

• Epigenetics
• Cell Biology
• Gastroenterology

Background:

• Mechanisms controlling intestinal crypt cell proliferation and differentiation are not fully understood.
• Histone methylation has been implicated in enterocytic differentiation.
• Histone deacetylation's role in normal intestinal cell regulation requires further investigation.

Purpose of the Study:

• To investigate the role of histone deacetylation in controlling intestinal cell proliferation and differentiation.
• To examine the effects of the histone deacetylase inhibitor suberanilohydroxamic acid (SAHA) on human and mouse intestinal cells.

Main Methods:

• Treatment of human Caco-2/15 cells and mouse intestinal cells with SAHA.
• Analysis of cell proliferation, histone acetylation levels, and expression of intestine-specific genes (sucrase-isomaltase, villin, SLC26A3).
• In vivo studies using SAHA-treated mice.

Main Results:

• SAHA treatment led to growth arrest and increased histone acetylation in Caco-2/15 cells.
• SAHA up-regulated intestine-specific gene expression, including sucrase-isomaltase and SLC26A3.
• In vivo, SAHA repressed crypt cell proliferation and increased sucrase-isomaltase expression in mouse intestines.
• SAHA inhibited normal human intestinal crypt cell proliferation in vitro.

Conclusions:

• Histone deacetylation is an important epigenetic mechanism regulating normal intestinal cell proliferation and differentiation.
• SAHA demonstrates potential in modulating intestinal cell fate, impacting both proliferation and differentiation.
• Epigenetic regulation via histone acetylation/deacetylation plays a crucial role in maintaining intestinal homeostasis.