Butyrate increases colonocyte protein synthesis in ulcerative colitis

Area of Science:

• Gastroenterology
• Cell Biology
• Molecular Medicine

Background:

• Distal ulcerative colitis (UC) is a chronic inflammatory bowel disease.
• Rectal butyrate administration shows promise in improving UC symptoms and promoting epithelial healing.
• The precise mechanisms by which butyrate enhances healing in UC require further elucidation.

Purpose of the Study:

• To investigate the effects of butyrate on colonocyte proliferation and protein production in patients with ulcerative colitis.
• To compare the response of UC epithelial cells to butyrate with those from patients with Crohn's disease, diverticulitis, and normal controls.

Main Methods:

• Colon mucosal tissue was obtained from patients with UC, Crohn's disease, diverticulitis, and cancer.
• Epithelial cells were isolated and incubated with sodium butyrate (10 mM) or saline control.
• Protein synthesis was measured using [14C]leucine incorporation.
• Cell proliferation was assessed using [3H]thymidine incorporation.

Main Results:

• Spontaneous colonocyte proliferation was significantly higher in UC patients compared to diverticulitis and normal controls.
• Butyrate significantly increased protein synthesis in epithelial cells from UC patients compared to the saline control.
• Epithelial cell viability and purity were consistently high (>88%) across experiments.

Conclusions:

• Butyrate enhances protein production in ulcerative colitis epithelial cells.
• The therapeutic benefits of butyrate in UC may stem from its role as a metabolic fuel, promoting epithelial healing through increased protein synthesis.