Presence of glucagon and glucagon-like peptide-1-(7-36)amide receptors in solubilized membranes of human adipose tissue

J Clin Endocrinol Metab. 1993 Dec;77(6):1654-7. doi: 10.1210/jcem.77.6.8263154.

Abstract

Specific receptors for glucagon and for glucagon-like peptide-1 (GLP-1) (7-36)amide have been found in solubilized human adipose membranes. The 50% inhibition dose of the corresponding unlabeled peptide was near to their physiological levels [ID50, 0.5 nmol/L for glucagon and 1.0 nmol/L for GLP-1(7-36)amide;]. In both cases, the presence of high affinity receptors was evident [Kd, 0.5 and 0.7 nmol/L for glucagon and GLP-1(7-36)amide, respectively]; the high affinity maximal binding capacity for GLP-1(7-36)amide was higher than that for glucagon (893 and 117 fmol/mg solubilized fat membranes, respectively). Glucagon at 10(-6) mol/L did not compete with the [125I]GLP-1(7-36)amide binding, nor did GLP-1(7-36)amide (10(-6) mol/L) compete with that of [125I]glucagon. The relative abundance of GLP-1(7-36)amide receptors in human adipose tissue is further support for a direct and probably important action of this peptide in the metabolism of the fat cell.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adipose Tissue / chemistry*
  • Aged
  • Cell Membrane / chemistry
  • Female
  • Glucagon
  • Glucagon-Like Peptide 1
  • Glucagon-Like Peptide-1 Receptor
  • Glucagon-Like Peptides
  • Humans
  • Male
  • Middle Aged
  • Peptide Fragments / metabolism*
  • Receptors, Cell Surface / analysis*
  • Receptors, Glucagon / analysis*

Substances

  • GLP1R protein, human
  • Glucagon-Like Peptide-1 Receptor
  • Peptide Fragments
  • Receptors, Cell Surface
  • Receptors, Glucagon
  • glucagon-like peptide 1 (7-36)amide
  • Glucagon-Like Peptides
  • Glucagon-Like Peptide 1
  • Glucagon