Rumen epithelium cell proliferation accelerated by propionate and acetate

Area of Science:

• Rumen physiology
• Animal nutrition
• Cell biology

Background:

• The rumen epithelium's health is crucial for nutrient absorption in ruminants.
• Understanding the effects of volatile fatty acids (VFAs) on rumen epithelial cell proliferation is vital for optimizing animal health and productivity.
• Propionate and acetate are key VFAs produced during ruminal fermentation.

Purpose of the Study:

• To investigate the mitogenic effect of intraruminal administration of sodium propionate and sodium acetate on sheep rumen papillae epithelial cells.
• To quantify the changes in mitotic index following VFA administration.

Main Methods:

• Adult sheep were fistulated and administered sodium propionate or sodium acetate (18 mmol/kg body weight/day) intraruminally.
• Ruminal papillae biopsies were collected to estimate the mitotic index of epithelial cells.
• Control sheep received 0.9% saline solution.

Main Results:

• Both propionate and acetate administration led to an increase in the mitotic index of rumen epithelial cells, indicating a mitogenic effect.
• Peak mitotic indices were observed between days 2-4 for propionate and days 3-4 for acetate.
• The mitotic indices in control sheep remained consistently low (<0.28%).

Conclusions:

• Propionate and acetate exhibit a clear mitogenic effect on sheep rumen epithelial cells.
• The observed proliferative response suggests these VFAs play a role in maintaining rumen wall integrity.
• The mitogenic effect of propionate and acetate appears weaker compared to butyrate, based on the rate of mitotic index increase.