Autoradiographic localization of receptors for glucagon-like peptide-1 (7-36) amide in rat brain.
Glucagon-like peptide-1 (GLP-1) has a sparse but well defined distribution in the rat brain where it is co-localized with glucagon-like immunoreactivity due to other fragments of the glucagon precursor. We have investigated the localization of GLP-1 receptors in rat brain using mono-125I-iodinated GLP-1(7-36) amide, the biologically active form of the peptide that occurs in brain, as the tracer for binding and autoradiographic studies of tissue sections. Displaceable binding of the label was sharply localized to discrete areas, being high in mamillary nuclei, the arcuate nucleus, nucleus of the solitary tract and the pretectal area, intermediate in the lateral septal nuclei, olfactory bulb, dorsal tegmental nuclei and the interpenduncular nucleus, and low in other regions. These results indicate areas where GLP-1(7-36) amide may have a role as a neurotransmitter or neuromodulator.
Uttenthal
L O
LO
Department of Biochemistry and Molecular Biology, Faculty of Medicine, Universidad Complutense, Madrid, Spain.
Toledano
A
A
Blázquez
E
E
D000818:Animals; D001923:Brain Chemistry; D005934:Glucagon; D052216:Glucagon-Like Peptide 1; D000067757:Glucagon-Like Peptide-1 Receptor; D004763:Glucagon-Like Peptides; D008297:Male; D018377:Neurotransmitter Agents / Q000378:metabolism; D010446:Peptide Fragments / Q000378:metabolism* / Q000502:physiology; D051381:Rats; D011919:Rats, Inbred Strains; D011956:Receptors, Cell Surface / Q000032:analysis; D018027:Receptors, Glucagon
C000593835:Glp1r protein, rat; D000067757:Glucagon-Like Peptide-1 Receptor; D018377:Neurotransmitter Agents; D010446:Peptide Fragments; D011956:Receptors, Cell Surface; D018027:Receptors, Glucagon; C061970:glucagon-like peptide 1 (7-36); D004763:Glucagon-Like Peptides; D052216:Glucagon-Like Peptide 1; D005934:Glucagon