title: Vagal stimulation rapidly increases leptin secretion in human stomach.
abstract: OBJECTIVE
  Leptin production has been reported in the rat and in human stomach. It initiates intestinal nutrient absorption. In this study, we analyzed the effect of vagal stimulation on leptin release in the human stomach.
  
  
  METHODS
  We studied the secretion of gastric acid and leptin on stimulation with insulin (a stimulant of vagal pathways via hypoglycemia) and pentagastrin in 11 healthy men (normal endoscopy and normal histological gastric mucosa), 5 with previous highly selective vagotomy (HSV), and 6 without HSV. Fundic biopsies were performed for immunostaining of leptin.
  
  
  RESULTS
  There was no difference between the 2 groups with respect to age, body mass index, basal leptin (4.8 +/- 1.2 ng/15 minutes) and gastric acid (0.7 +/- 0.2 mmol/15 minutes) outputs. Leptin-immunoreactivity was found in the fundic glands, and its distribution and density were similar in 2 groups. Insulin caused a rapid (15-minute) increase in leptin output in men without HSV (31 +/- 9 ng/15 minutes), but not in those with HSV (7.7 +/- 3.2 ng/15 minutes). Insulin-stimulated gastric leptin was biphasic, with a rapid increase (15 minutes after injection) followed by a second steady and sustained increase (39.9 +/- 7.6 ng/15 minutes at 120 minutes after injection). Pentagastrin increased gastric leptin output in individuals with (30 +/- 4.9 ng/15 minutes) and without (26 +/- 3.2 ng/15 minutes) HSV. Insulin and pentagastrin did not modify plasma leptin, whatever HSV status.
  
  
  CONCLUSIONS
  Vagal stimulation of leptin release in the human stomach suggests that leptin is released during the cephalic phase of gastric secretion. Luminal leptin may be involved in vagus-mediated intestinal functions.
authors.affiliation: Institut National de la Santé et de la Recherche Médicale, Hôpital Bichat-Claude Bernard, Paris, France. iradj.sobhani@bch.ap-hop.fr
authors.forename: Iradj
authors.initials: I
authors.lastname: Sobhani
authors.forename: Marion
authors.initials: M
authors.lastname: Buyse
authors.forename: Hélène
authors.initials: H
authors.lastname: Goïot
authors.forename: Nina
authors.initials: N
authors.lastname: Weber
authors.forename: Jean-Pierre
authors.initials: JP
authors.lastname: Laigneau
authors.forename: Dominique
authors.initials: D
authors.lastname: Henin
authors.forename: Jean-Claude
authors.initials: JC
authors.lastname: Soul
authors.forename: André
authors.initials: A
authors.lastname: Bado
mesh_terms: D000328:Adult; D001786:Blood Glucose; D005744:Gastric Acid / Q000378:metabolism; D005753:Gastric Mucosa / Q000294:innervation* / Q000378:metabolism*; D005765:Gastrointestinal Agents / Q000008:administration & dosage; D006801:Humans; D007004:Hypoglycemic Agents / Q000008:administration & dosage; D007328:Insulin / Q000008:administration & dosage; D020738:Leptin / Q000378:metabolism*; D008297:Male; D008875:Middle Aged; D010418:Pentagastrin / Q000008:administration & dosage; D014628:Vagotomy; D014630:Vagus Nerve / Q000502:physiology* / Q000601:surgery
chemical_list: D001786:Blood Glucose; D005765:Gastrointestinal Agents; D007004:Hypoglycemic Agents; D007328:Insulin; D020738:Leptin; D010418:Pentagastrin