Acute effects of insulin-like growth factor I on inter-organ amino acid flux in protein-catabolic dogs

E. Roth, L. Valentini, T. Holzenbein, S. Winkler, T. Sautner, H. Hortnagl, J. Karner

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

The effects of acute administration of human recombinant insulin-like growth factor-I (rhIGF-I) on amino acid (AA) flux between hindlimbs, liver and gut were investigated in anaesthetized post-operative dogs. rhIGF-I produced about a 10-fold increase in plasma IGF-I concentrations above baseline values (P < 0.001), increased the plasma levels of glucagon and adrenaline (P < 0.05), and evoked a fall in plasma glucose (-55 ± 8%; P < 0.001) and plasma total AA levels (-23 ± 8%; P < 0.05). AA flux in post-absorptive dogs under NaCl infusions was characterized by an efflux of AA from the hindlimbs (as a result of the protein-catabolic situation), an equal AA balance across the gut and an AA uptake by the liver. The administration of rhIGF-I increased hepatic AA uptake in the NaCl group from 3.51 ± 0.8 to 7.5 ± 0.4 μmol/min per kg (P< 0.01) and in the AA-infused group from 16.8 ± 0.6 to 22.4 ± 1.5 μmol/min per kg (P < 0.05), but did not influence the AA balance across hindlimbs and gut. Glucose infusions normalized the plasma concentrations of counter-regulatory hormones without influencing the inter-organ AA balances. We conclude that hypoaminoacidaemia caused by rhIGF-I infusions is the result of a stimulated AA uptake by the liver, but is unrelated to alterations of AA exchange across the hindlimbs.

Original languageEnglish
Pages (from-to)765-769
Number of pages5
JournalBiochemical Journal
Volume296
Issue number3
DOIs
Publication statusPublished - 1993

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology

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