Abstract:
:Gastrin stimulates gastric acid secretion by acting on the cholecystokinin B/gastrin receptor (CCK-BR). The localization of this receptor at the cellular level showed conflicting results in animal studies and has not been described in man by immunohistochemistry. The aim of the present study is to characterize the precise cellular location of the CCK-BR in the human stomach. Polyclonal antisera were raised against different epitopes of the CCK-BR molecule and used for immunohistochemical investigations. CCK-BR mRNA was detected in paraffin tissue sections by the highly sensitive method of in situ reverse transcriptase-polymerase chain reaction (RT-PCR). Using immunohistochemistry, CCK-BR could successfully be localized in gastric parietal cells. In the majority of parietal cells, CCK-BR immunoreactivity was present a he basolateral cell membrane domain. In some parietal cells, a granular pattern of immunoreactivity was exclusively confined to the cytoplasm of the cells. CCK-BR mRNA was found in parietal cells and in enterochromaffin-like (ECL) cells by means of in situ RT-PCR. No expression of CCK-BR was found in the gastric antral mucosa. Our data support the concept that gastrin stimulates gastric acid secretion directly via CCK-B receptors on parietal cells and indirectly by inducing histamine release from histamine-containing ECL cells, which contributes to acid secretion by parietal cells.
journal_name
Cell Tissue Resjournal_title
Cell and tissue researchauthors
Kulaksiz H,Arnold R,Göke B,Maronde E,Meyer M,Fahrenholz F,Forssmann WG,Eissele Rdoi
10.1007/s004419900114keywords:
subject
Has Abstractpub_date
2000-02-01 00:00:00pages
289-98issue
2eissn
0302-766Xissn
1432-0878journal_volume
299pub_type
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