Localization of calcitonin gene-related peptide receptors in rat gastric mucosa.
The location of calcitonin gene-related peptide (CGRP) receptors in the rat stomach has not been elucidated. It was recently reported that the CGRP receptor is formed when a calcitonin-receptor-like receptor (CRLR) and receptor activity modifying protein (RAMP) 1 are co-expressed on the cell membrane. The aim of this study was to determine the location and the role of CGRP receptors in the rat gastric mucosa. Gene expressions of CRLR and RAMP1 were investigated by Northern blot analysis, reverse transcription-polymerase chain reaction (RT-PCR), and in situ hybridization. Immunohistochemical stainings for CGRP, somatostatin, gastrin, and chromogranin A were performed. Gastric endocrine cells were collected by counterflow-elutriation and their responses to CGRP were studied. CRLR and RAMP1 mRNA was expressed mainly in small gastric epithelial cells in the pyloric glands. The mRNA expression had a similar distribution to that of D cells. In cultured gastric endocrine cells, CGRP enhanced somatostatin production, while it inhibited the secretion of histamine and gastrin. Our results suggest that CGRP receptors are expressed in D cells in the rat gastric mucosa and control production and secretion of somatostatin.
Kawashima
Kousaku
K
Second Department of Internal Medicine, Shimane Medical University, 89-1 Enya-cho, Izumo, Shimane, Japan.
Ishihara
Shunji
S
Karim Rumi
Mohammad Azharul
MA
Moriyama
Nobuyuki
N
Kazumori
Hideaki
H
Suetsugu
Hiroshi
H
Sato
Hiroshi
H
Fukuda
Ryo
R
Adachi
Kyoichi
K
Shibata
Masahiro
M
Onodera
Sadayoshi
S
Chiba
Tsutomu
T
Kinoshita
Yoshikazu
Y
D000818:Animals; D015740:Calcitonin Gene-Related Peptide / Q000378:metabolism; D053379:Chromogranin A; D002864:Chromogranins / Q000032:analysis; D005753:Gastric Mucosa / Q000737:chemistry / Q000378:metabolism*; D005755:Gastrins / Q000032:analysis / Q000378:metabolism; D006632:Histamine / Q000378:metabolism; D007150:Immunohistochemistry; D017403:In Situ Hybridization; D047908:Intracellular Signaling Peptides and Proteins; D008565:Membrane Proteins / Q000032:analysis / Q000235:genetics / Q000378:metabolism; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D051381:Rats; D058262:Receptor Activity-Modifying Protein 1; D058261:Receptor Activity-Modifying Proteins; D018015:Receptors, Calcitonin Gene-Related Peptide / Q000032:analysis / Q000235:genetics / Q000378:metabolism*; D013004:Somatostatin / Q000032:analysis / Q000378:metabolism
D053379:Chromogranin A; D002864:Chromogranins; D005755:Gastrins; D047908:Intracellular Signaling Peptides and Proteins; D008565:Membrane Proteins; D012333:RNA, Messenger; C545508:Ramp1 protein, rat; D058262:Receptor Activity-Modifying Protein 1; D058261:Receptor Activity-Modifying Proteins; D018015:Receptors, Calcitonin Gene-Related Peptide; D013004:Somatostatin; D006632:Histamine; D015740:Calcitonin Gene-Related Peptide