title: Expression of leptin and leptin receptor isoforms in the human stomach.
abstract: BACKGROUND
  Leptin 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.
  
  
  OBJECTIVE
  To investigate expression of leptin and its corresponding receptors in human gastric epithelial cells.
  
  
  METHODS
  Fundic 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.
  
  
  RESULTS
  mRNA 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.
  
  
  CONCLUSIONS
  Leptin 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.
authors.affiliation: Department of Gastroenterology and Hepatology, Medizinische Hochschule Hannover, Germany.
authors.forename: H
authors.initials: H
authors.lastname: Mix
authors.forename: A
authors.initials: A
authors.lastname: Widjaja
authors.forename: O
authors.initials: O
authors.lastname: Jandl
authors.forename: M
authors.initials: M
authors.lastname: Cornberg
authors.forename: A
authors.initials: A
authors.lastname: Kaul
authors.forename: M
authors.initials: M
authors.lastname: Göke
authors.forename: W
authors.initials: W
authors.lastname: Beil
authors.forename: M
authors.initials: M
authors.lastname: Kuske
authors.forename: G
authors.initials: G
authors.lastname: Brabant
authors.forename: M P
authors.initials: MP
authors.lastname: Manns
authors.forename: S
authors.initials: S
authors.lastname: Wagner
mesh_terms: D001706:Biopsy; D002352:Carrier Proteins / Q000378:metabolism*; D002478:Cells, Cultured; D005753:Gastric Mucosa / Q000378:metabolism* / Q000473:pathology; D006801:Humans; D020738:Leptin / Q000235:genetics / Q000378:metabolism*; D020033:Protein Isoforms / Q000235:genetics / Q000378:metabolism; D012333:RNA, Messenger / Q000032:analysis; D011956:Receptors, Cell Surface; D054411:Receptors, Leptin; D020133:Reverse Transcriptase Polymerase Chain Reaction; D013274:Stomach Neoplasms / Q000378:metabolism; D014407:Tumor Cells, Cultured
chemical_list: D002352:Carrier Proteins; C515448:LEPR protein, human; D020738:Leptin; D020033:Protein Isoforms; D012333:RNA, Messenger; D011956:Receptors, Cell Surface; D054411:Receptors, Leptin