Hepatic ketogenesis and gluconeogenesis in humans

J Clin Invest. 1974 Oct;54(4):981-9. doi: 10.1172/JCI107839.

Abstract

Splanchnic arterio-hepatic venous differences for a variety of substrates associated with carbohydrate and lipid metabolism were determined simultaneously with hepatic blood flow in five patients after 3 days of starvation. Despite the relative predominance of circulating beta-hydroxybutyrate, the splanchnic productions of both beta-hydroxybutyrate and acetoacetate were approximately equal, totaling 115 g/24 h. This rate of hepatic ketogenesis was as great as that noted previously after 5-6 wk of starvation. Since the degree of hyperketonemia was about threefold greater after 5-6 wk of starvation, it seems likely that the rate of ketone-body removal by peripheral tissues is as important in the development of the increased ketone-body concentrations observed after prolonged starvation as increased hepatic ketone-body production rate. Splanchnic glucose release in this study was 123 g/24 h, which was less than that noted previously after an overnight fast, but was considerably more than that noted during prolonged starvation. Hepatic gluconeogenesis was estimated to be 99 g/24 h, calculated as the sum of lactate, pyruvate, glycerol, and amino acid uptake. This was greater than that observed either after an overnight fast or after prolonged starvation. In addition, a direct relationship between the processes of hepatic ketogenesis and gluconeogenesis was observed.

MeSH terms

  • Acetoacetates / blood
  • Blood Glucose
  • Carbon Dioxide / blood
  • Cardiac Output
  • Catheterization
  • Fatty Acids, Nonesterified / blood
  • Gluconeogenesis*
  • Hepatic Veins
  • Humans
  • Hydroxybutyrates / blood
  • Ketone Bodies / blood
  • Ketone Bodies / metabolism*
  • Lactates / blood
  • Liver / metabolism*
  • Liver Circulation
  • Oxygen / blood
  • Starvation / blood

Substances

  • Acetoacetates
  • Blood Glucose
  • Fatty Acids, Nonesterified
  • Hydroxybutyrates
  • Ketone Bodies
  • Lactates
  • Carbon Dioxide
  • Oxygen