Reciprocal cellular distribution of glucagon-like peptide-1 (GLP-1) immunoreactivity and GLP-1 receptor mRNA in pancreatic islets of rat.
The respective cellular distribution of glucagon-like peptide-1 (GLP-1) immunoreactivity and mRNA expression of the GLP-1 receptor was compared in rat pancreas by means of immunohistochemistry and in situ hybridization. GLP-1 immunoreactivity was present in the marginal zone of rat pancreatic islets. In contrast, GLP-1 receptor mRNA signals were confined to the central part of pancreatic islets. Neither GLP-1 immunoreactivity nor GLP-1 receptor mRNA signals were detected in the exocrine pancreatic acinar cells or duct cells. The differential distribution of GLP-1 immunoreactivity and GLP-1 receptor mRNA signals indicates that the GLP-1 amino acid sequence is present in the alpha-cell zone of pancreatic islets, whereas the GLP-1 receptor is expressed mainly by beta cells. Thus, our data by in situ hybridization demonstrates the significant expression of GLP-1 receptors on beta cells but makes a significant expression on alpha cells rather unlikely.
Hörsch
D
D
Department of Internal Medicine, Philipps-Universität, Marburg, Germany.
Göke
R
R
Eissele
R
R
Michel
B
B
Göke
B
B
D000818:Animals; D001483:Base Sequence; D017931:DNA Primers / Q000235:genetics; D052216:Glucagon-Like Peptide 1; D000067757:Glucagon-Like Peptide-1 Receptor; D007150:Immunohistochemistry; D017403:In Situ Hybridization; D007515:Islets of Langerhans / Q000378:metabolism*; D008297:Male; D010455:Peptides / Q000378:metabolism*; D016133:Polymerase Chain Reaction; D012333:RNA, Messenger / Q000235:genetics* / Q000378:metabolism*; D051381:Rats; D017207:Rats, Sprague-Dawley; D018027:Receptors, Glucagon / Q000235:genetics*; D014018:Tissue Distribution
D017931:DNA Primers; C000593835:Glp1r protein, rat; D000067757:Glucagon-Like Peptide-1 Receptor; D010455:Peptides; D012333:RNA, Messenger; D018027:Receptors, Glucagon; D052216:Glucagon-Like Peptide 1