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Related Experiment Videos

Interaction between colonic acetate and propionate in humans.

T M Wolever1, P Spadafora, H Eshuis

  • 1Department of Nutritional Sciences, Faculty of Medicine, University of Toronto, Ontario, Canada.

The American Journal of Clinical Nutrition
|March 1, 1991
PubMed
Summary

Colonic fermentation of carbohydrates produces propionate, which may be gluconeogenic and inhibit liver cholesterol synthesis. This study in healthy humans found propionate counteracted acetate

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Area of Science:

  • Biochemistry
  • Human Physiology
  • Metabolic Studies

Background:

  • Animal studies suggest colonic propionate is gluconeogenic and inhibits hepatic cholesterol synthesis.
  • Understanding the role of short-chain fatty acids (SCFAs) in human metabolism is crucial.

Purpose of the Study:

  • To investigate the effects of rectally infused acetate and propionate on human serum metabolites.
  • To test the hypothesis that colonic propionate is gluconeogenic and inhibits acetate's role in cholesterol synthesis.

Main Methods:

  • Six healthy subjects received rectal infusions of saline (control), acetate alone, propionate alone, or a mixture of acetate and propionate.
  • Serum concentrations of cholesterol, glucose, glucagon, acetate, propionate, and free fatty acids (FFAs) were measured.

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Main Results:

  • Acetate infusion increased serum cholesterol, glucagon, and acetate, while decreasing FFAs.
  • Propionate infusion increased serum propionate, glucose, and glucagon, with no effect on cholesterol.
  • Co-infusion of propionate with acetate prevented the rise in serum cholesterol observed with acetate alone.

Conclusions:

  • Rectal propionate administration acts as a gluconeogenic substrate in humans.
  • Propionate appears to inhibit acetate utilization for cholesterol synthesis in the liver.
  • These findings support the role of colonic propionate in human metabolic regulation.