The antiketogenic effect of alanine in normal man: evidence for an alanine-ketone body cycle

Metabolism. 1981 Jun;30(6):563-7. doi: 10.1016/0026-0495(81)90131-1.

Abstract

The effect of alanine on ketone body levels, independent of hormonal changes, in normal man has been investigated. Five normal subjects were given somatostatin infusions (200 micrograms/hour) for 3 hr. After 1 hr alanine or isotonic saline was infused for 2 hr. With saline blood beta-hydroxybutyrate and acetoacetate levels rose steadily to a peak of 0.230 plus or minus 0.053 and 0.112 plus or minus 0.023 mmole/l respectively. With alanine beta-hydroxybutyrate and acetoacetate levels plateaued at 0.099 plus or minus 0.020 and 0.055 plus or minus 0.006 mmole/l respectively. Alanine levels reached nearly 1 mmole/l but a significant effect on ketone body levels was apparent at physiologic levels (less than 0.6 mmole/l). Plasma fatty acid and glycerol levels did not change significantly. Insulin C-peptide and glucagon levels were suppressed to a similar extent in both experiments. These results support the view that alanine suppresses ketogenesis in man by a direct hepatic effect independent of insulin and glucagon. It is suggested that this forms part of a negative feedback substrate cycle between alanine and ketone bodies.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • 3-Hydroxybutyric Acid
  • Acetoacetates*
  • Adult
  • Alanine*
  • Blood Glucose / metabolism
  • C-Peptide / blood
  • Glucagon / blood
  • Humans
  • Hydroxybutyrates / blood
  • Insulin / blood
  • Keto Acids / blood
  • Ketone Bodies / blood*
  • Kinetics
  • Male
  • Somatostatin

Substances

  • Acetoacetates
  • Blood Glucose
  • C-Peptide
  • Hydroxybutyrates
  • Insulin
  • Keto Acids
  • Ketone Bodies
  • acetoacetic acid
  • Somatostatin
  • Glucagon
  • Alanine
  • 3-Hydroxybutyric Acid