title: Presence of glucagon and glucagon-like peptide-1-(7-36)amide receptors in solubilized membranes of human adipose tissue.
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.
authors.affiliation: Fundación Jiménez Díaz, Madrid, Spain.
authors.forename: E
authors.initials: E
authors.lastname: Mérida
authors.forename: E
authors.initials: E
authors.lastname: Delgado
authors.forename: L M
authors.initials: LM
authors.lastname: Molina
authors.forename: M L
authors.initials: ML
authors.lastname: Villanueva-Peñacarrillo
authors.forename: I
authors.initials: I
authors.lastname: Valverde
mesh_terms: D000273:Adipose Tissue / Q000737:chemistry*; D000368:Aged; D002462:Cell Membrane / Q000737:chemistry; D005260:Female; D005934:Glucagon; D052216:Glucagon-Like Peptide 1; D000067757:Glucagon-Like Peptide-1 Receptor; D004763:Glucagon-Like Peptides; D006801:Humans; D008297:Male; D008875:Middle Aged; D010446:Peptide Fragments / Q000378:metabolism*; D011956:Receptors, Cell Surface / Q000032:analysis*; D018027:Receptors, Glucagon / Q000032:analysis*
chemical_list: C000593833:GLP1R protein, human; D000067757:Glucagon-Like Peptide-1 Receptor; D010446:Peptide Fragments; D011956:Receptors, Cell Surface; D018027:Receptors, Glucagon; C055453:glucagon-like peptide 1 (7-36)amide; D004763:Glucagon-Like Peptides; D052216:Glucagon-Like Peptide 1; D005934:Glucagon