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Medical AI Inquiry: You was designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.  Labels: OBJECTIVE, METHODS, RESULTS. Meshes: Animals, Blotting, Western, Disease Models, Animal, Enzyme-Linked Immunosorbent Assay, Leptin, Mice, Mice, Inbred C57BL, Mice, Obese, Neovascularization, Physiologic, Reverse Transcriptase Polymerase Chain Reaction, Statistics, Nonparametric, Stomach Ulcer, Up-Regulation, Vascular Endothelial Growth Factor A, Wound Healing.
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Does leptin promote gastric ulcer healing via upregulation of vascular endothelial growth factor? Context: Leptin, a key hormone in regulation of food intake and energy expenditure, exerts pleiotropic cytokine-like biological effects. Its role in gastric ulcer healing is unclear. In this study, we investigated the role of leptin in gastric ulcer healing. Experimental gastric ulcer was induced by focal serosal application of acetic acid in leptin-deficient ob/ob mice and wild-type mice. Healing of gastric ulcer and angiogenesis in the ulcer tissue was evaluated. Gastric ulcer healing was delayed in ob/ob mice compared with that in wild-type mice. The impairment of ulcer healing observed in ob/ob mice was characterized by reduced expression of vascular endothelial growth factor (VEGF) and impairment of angiogenesis. Systemic administration of leptin to ob/ob mice reversed the impairment of gastric ulcer healing; this reversal was accompanied by an increase in VEGF expression and angiogenesis. Although mRNA for leptin was not expressed in normal gastric mucosa and not induced in ulcerous tissue, leptin receptor expression was markedly upregulated in gastric epithelial cells at ulcer margins, and was colocalized with VEGF.
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These findings suggest that leptin promotes gastric ulcer healing by induction of angiogenesis in the granular tissue of ulcers via upregulation of VEGF expression. Final Decision: yes