Protective role of 1,25(OH)2vitamin D3 in the mucosal injury and epithelial barrier disruption in DSS-induced acute colitis in mice

BMC Gastroenterology

Xiaolan Zhang¹  David Q Shih²  Chenyang Li³  Jian Guo¹  Lei Liu¹  Hui Li¹  Hui Wu¹  Hong Zhang¹  Hongwei Zhao¹ 

[1] Department of Gastroenterology, The Second Hospital of Hebei Medical University, Hebei Key Laboratory of Gastroenterology, Hebei Institute of Gastroenterology, No.215 Heping West Road, 050000, Shijiazhuang, China;Inflammatory Bowel & Immunobiology Research Institute, Cedars-Sinai Medical Center, Los Angeles, CA, 90048, USA;Hebei Medical University, No.361 Zhongshan East Road, 050017, Shijiazhuang, China

关键词: 1,25-dihydroxyvitamin D₃;    Tight junction;    Inflammatory bowel disease;    Dextran sulfate sodium;    Barrier protection function;   

Others  :  1113060
DOI  :  10.1186/1471-230X-12-57

 received in 2012-02-04, accepted in 2012-04-15,  发布年份 2012

【 摘 要 】

Background

Intestinal hyper-permeability plays a critical role in the etiopathogenesis of inflammatory bowel disease (IBD) by affecting the penetration of pathogens, toxic compounds and macromolecules. 1,25-dihydroxyvitamin D₃ [1,25(OH)₂D₃], the active form of vitamin D, has been shown to be an important regulator of IBD and recent epidemiology suggests that patients with IBD have an impaired vitamin D status. The purpose of this study is to investigate the possible protective effects of 1,25(OH)₂D₃ on mucosal injury and epithelial barrier disruption on dextran sulfate sodium (DSS)-induced acute colitis model.

Methods

We used DSS-induced acute colitis model to investigate the protective effects of 1,25(OH)₂D₃ on mucosal injury and epithelial barrier integrity. Severity of colitis was evaluated by disease activity index (DAI), body weight (BW) change, colon length, histology, myeloperoxidase (MPO) activity, and proinflammatory cytokine production including tumor necrosis factor-α (TNF-α) and interferon-γ (IFN-γ). In vitro the protective role of 1,25(OH)₂D₃ was assessed by incubating Caco-2 cells with or without DSS and measuring transepithelial electrical resistance (TEER) and fluorescein isothiocyanate dextran (FITC-D). The intestinal permeability was analyzed by FITC-D, bacterial translocation and measurement of lipopolysaccharide (LPS). Ultrastructural features of the colon tissue and Caco-2 cell monolayer were observed by electron microscopy. Expressions of tight junction (TJ) proteins in the colon mucosa and Caco-2 cells were detected by immunohistochemistry, immunofluorescence, Western blot and real-time fluorescent quantitative PCR, respectively.

Results

DSS-induced acute colitis model was characterized by a reduced BW, AUC of BW, serum calcium, higher DAI, AUC of DAI, shortened colon length, elevated MPO activity, worsened histologic inflammation, increased mononuclear cell numbers in mesenteric lymph nodes (MLNs) and colonic lamina propria (LP), and enhanced proteins and mRNA levels of TNF-α and IFN-γ. 1,25(OH)₂D₃ markedly increased expressions of TJ proteins and mRNA and decreased the FITC-D permeability and the level of LPS. Furthermore, 1,25(OH)₂D₃ abrogated bacterial translocation to MLNs and ameliorated ultrastructural features of the colon epithelium by scanning electron microscopy (SEM). In vitro, 1,25(OH)₂D₃ increased TEER, TJ proteins and mRNA expressions, decreased the FITC-D permeability, and preserved structural integrity of the TJ in Caco-2 cells.

Conclusions

1,25(OH)₂D₃ may play a protective role in mucosal barrier homeostasis by maintaining the integrity of junction complexes and in healing capacity of the colon epithelium. 1,25(OH)₂D₃ may represent an attractive and novel therapeutic agent for the adjuvant therapy of IBD.

【 授权许可】

   
2012 zhao et al.; licensee BioMed Central Ltd.

【 图 表 】

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