Background: Obesity is a risk factor for acute pancreatitis (AP), but the molecular mechanism remains unclear. Adiponectin, an adipose tissue-derived secretory factor, has anti-inflammatory properties in addition to various biological functions, and its plasma concentrations are reduced in obese subjects. However, the role of adiponectin in AP has not been investigated.
Aim: To determine the effects of adiponectin on AP.
Methods: We investigated the effects of adiponectin on experimental AP by using adiponectin-knockout (APN-KO) mice and adenovirus-mediated adiponectin over-expression. AP was induced by 10 hourly intraperitoneal injections of low-dose caerulein (10 μg/kg) after 2 week feeding of normal chow or a high-fat diet (HFD) in wild-type (WT) and APN-KO mice. We evaluated the severity of AP biochemically and morphologically.
Results: Low-dose caerulein treatment did not induce pancreatic damage in either WT or APN-KO mice under normal chow feeding. APN-KO mice, but not WT mice, fed a HFD and then treated with caerulein developed pancreatic damage and inflammation, accompanied by increased macrophage/neutrophil infiltration and upregulation of pro-inflammatory mediators such as tumour necrosis factor α in the pancreas. Adenovirus-mediated over-expression of adiponectin attenuated the severity of HFD/caerulein-induced AP in APN-KO mice.
Conclusions: Adiponectin plays a protective role in caerulein-induced AP in HFD-fed mice.
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▸ A supplementary figure is published online only at http://gut.bmj.com/content/vol57/issue10
Funding: This study was supported by a grant from the Japanese Ministry of Education, Culture, Sports, Science, and Technology.
Competing interests: None.
Ethics approval: Approval for this study was granted by the Committee for Animal Experimentation of Osaka University on 14 March 2006.
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