1. Leptin Promotes Gastric Ulcer Healing via Upregulation of Vascular Endothelial Growth Factor
- Author
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Koji Otani, Toshio Watanabe, Nobuhide Oshitani, Hirohisa Machida, Tetsuya Tanigawa, Hirotoshi Okazaki, Yasuhiro Fujiwara, Kazuhide Higuchi, Yuji Nadatani, Kazunari Tominaga, Hirokazu Yamagami, Tetsuo Arakawa, and Kenji Watanabe
- Subjects
Leptin ,Vascular Endothelial Growth Factor A ,medicine.medical_specialty ,Angiogenesis ,Blotting, Western ,Mice, Obese ,Neovascularization, Physiologic ,Enzyme-Linked Immunosorbent Assay ,Statistics, Nonparametric ,Pathogenesis ,Neovascularization ,Mice ,chemistry.chemical_compound ,Downregulation and upregulation ,Internal medicine ,medicine ,Animals ,Stomach Ulcer ,Wound Healing ,Reverse Transcriptase Polymerase Chain Reaction ,business.industry ,Stomach ,digestive, oral, and skin physiology ,Gastroenterology ,digestive system diseases ,Up-Regulation ,Mice, Inbred C57BL ,Vascular endothelial growth factor ,Disease Models, Animal ,Endocrinology ,medicine.anatomical_structure ,chemistry ,medicine.symptom ,business ,Hormone - Abstract
Background and Aim: 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. Methods: 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. Results: 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. Conclusion: These findings suggest that leptin promotes gastric ulcer healing by induction of angiogenesis in the granular tissue of ulcers via upregulation of VEGF expression.
- Published
- 2010
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