Gut 2000;47:481-486 ( October )

Article

Expression of leptin and leptin receptor isoforms in the human stomach H Mix^a, A Widjaja^b, O Jandl^a, M Cornberg^a, A Kaul^a, M Göke^a, W Beil^c, M Kuske^d, G Brabant^b, M P Manns^a, S Wagner^a

^a Department of Gastroenterology and Hepatology, Medizinische Hochschule Hannover, Germany, ^b Department of Endocrinology, Medizinische Hochschule Hannover, Germany, ^c Department of Pharmacology, Medizinische Hochschule Hannover, Germany, ^d Institute for Pathology, Medizinische Hochschule Hannover, Germany

Correspondence to: Dr S Wagner, Department of Gastroenterology and Hepatology, Medizinische Hochschule Hannover, Carl-Neuberg-Str. 1, 30625 Hannover, Germany. Email: wagner.siegfried{at}mh-hannover.de

Accepted for publication 8 February 2000

BACKGROUNDLeptin is an important regulator of food intake and energy expenditure. Initially it was thought to be expressed exclusively in and secreted by adipocytes. Recently, leptin expression was also noted in other tissues, including rat gastric mucosa. Information on leptin and leptin receptor expression in the human stomach is lacking.
AIMTo investigate expression of leptin and its corresponding receptors in human gastric epithelial cells.
METHODSFundic and antral gastric mucosal biopsies, primary cultures of human gastric epithelial cells, and the human gastric cancer cell line AGS were screened for expression of leptin and different leptin receptor isoform mRNA by reverse transcriptase-polymerase chain reaction. Immunohistochemistry was performed for localisation of leptin and leptin receptor proteins in gastric mucosa.
RESULTSmRNA of leptin and its four receptor isoforms (huOB-R, long receptor isoform; huB219.1-3, short receptor isoforms) was detected in gastric mucosal biopsies, cultured human gastric epithelial cells, and gastric cancer cells. Immunohistochemistry demonstrated that chief as well as parietal cells were reactive to leptin and leptin receptors.
CONCLUSIONSLeptin and leptin receptors are expressed in human gastric mucosa. These findings suggest a paracrine and/or autocrine effect of leptin on gastric epithelial cell function.


Keywords: leptin; leptin receptor isoforms; immunohistochemistry; gastric mucosa

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© 2000 by Gut
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