The decisive role of free fatty acids for protein conservation during fasting in humans with and without growth hormone

Helene Nørrelund, K Sreekumaran Nair, Steen Nielsen, Jan Frystyk, Per Ivarsen, Jens Otto Lunde Jørgensen, Jens Sandahl Christiansen, Niels Møller

Research output: Contribution to journalArticle

52 Citations (Scopus)

Abstract

During fasting, a lack of GH increases protein loss by close to 50%, but the underlying mechanisms remain uncertain. The present study tests the hypothesis that the anabolic actions of GH depend on mobilization of lipids. Seven normal subjects were examined on four occasions during a 37-h fast with infusion of somatostatin, insulin, and glucagon for the final 15 h: 1) with GH replacement, 2) with GH replacement and antilipolysis with acipimox, 3) without GH and with antilipolysis, and 4) with GH replacement, antilipolysis, and infusion of intralipid. Urinary urea excretion, serum urea concentrations, and muscle protein breakdown (assessed by labeled phenylalanine) increased by almost 50% during fasting with suppression of lipolysis. Addition of GH during fasting with antilipolysis did not influence indexes of protein degradation, whereas restoration of high FFA levels regenerated proportionally low concentrations of urea and decreased whole body protein degradation (phenylalanine to tyrosine conversion) by 10-15%, but failed to affect muscle protein metabolism. Thus, the present data provide strong evidence that FFA are important protein-sparing agents during fasting. The finding that inhibition of lipolysis eliminates the ability of GH to restrict fasting protein loss indicates that stimulation of lipolysis is the principal protein-conserving mechanism of GH.

Original languageEnglish (US)
Pages (from-to)4371-4378
Number of pages8
JournalJournal of Clinical Endocrinology and Metabolism
Volume88
Issue number9
DOIs
StatePublished - Sep 1 2003

Fingerprint

Nonesterified Fatty Acids
Growth Hormone
Fasting
Conservation
Lipolysis
Urea
Muscle Proteins
Proteins
Phenylalanine
Proteolysis
Lipid Mobilization
Aptitude
Degradation
Somatostatin
Glucagon
Tyrosine
Metabolism
Restoration
Insulin
Lipids

ASJC Scopus subject areas

  • Biochemistry
  • Endocrinology, Diabetes and Metabolism

Cite this

The decisive role of free fatty acids for protein conservation during fasting in humans with and without growth hormone. / Nørrelund, Helene; Nair, K Sreekumaran; Nielsen, Steen; Frystyk, Jan; Ivarsen, Per; Jørgensen, Jens Otto Lunde; Christiansen, Jens Sandahl; Møller, Niels.

In: Journal of Clinical Endocrinology and Metabolism, Vol. 88, No. 9, 01.09.2003, p. 4371-4378.

Research output: Contribution to journalArticle

Nørrelund, Helene ; Nair, K Sreekumaran ; Nielsen, Steen ; Frystyk, Jan ; Ivarsen, Per ; Jørgensen, Jens Otto Lunde ; Christiansen, Jens Sandahl ; Møller, Niels. / The decisive role of free fatty acids for protein conservation during fasting in humans with and without growth hormone. In: Journal of Clinical Endocrinology and Metabolism. 2003 ; Vol. 88, No. 9. pp. 4371-4378.
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