The constitutive expression of galectin-3 is downregulated in the intestinal epithelia of Crohn's disease patients, and tumour necrosis factor alpha decreases the level of galectin-3-specific mRNA in HCT-8 cells

被引：48

作者：

Jensen-Jarolim, E ^{[1
]}

Gscheidlinger, R ^{[1
]}

Oberhuber, G ^{[1
]}

Neuchrist, C ^{[1
]}

Lucas, T ^{[1
]}

Bises, G ^{[1
]}

Radauer, C ^{[1
]}

Willheim, M ^{[1
]}

Scheiner, O ^{[1
]}

Liu, FT ^{[1
]}

Boltz-Nitulescu, G ^{[1
]}

机构：

[1] Univ Vienna, Dept Pathophysiol, Vienna, Austria

来源：

EUROPEAN JOURNAL OF GASTROENTEROLOGY & HEPATOLOGY | 2002年 / 14卷 / 02期

关键词：

cytokines; epithelial cells; inflammatory bowel disease; lectins;

D O I：

10.1097/00042737-200202000-00008

中图分类号：

R57 [消化系及腹部疾病];

学科分类号：

摘要：

Objective Galectin-3, a lectin with specificity for beta galactoside, is expressed by a variety of cells, including intestinal epithelial cells. Among other functions, galectin-3 mediates cell adhesion and is involved in inflammatory processes. In this study, we assessed the expression of galectin-3 in intestinal epithelial cells from Crohn's disease patients (n = 10), ileum adjacent to resected colon carcinoma (n = 9), unspecific bowel inflammation (n = 1), diverticulosis (n = 1), ulcerative colitis (n = 3) and healthy jejunum used for interposition in larynx carcinoma (n = 1). The role of cytokines on galectin-3 expression was a further aim of our study. Methods The galectin-3 distribution in intestinal epithelia was analysed by immunohistochemistry, immunoblotting, immunofluorescence and reverse transcriptase polymerase chain reaction (RT-PCR). Human intestinal epithelial cell line (HCT-8) and primary cultured intestinal epithelial cells were treated with cytokines, and the effects on galectin-3 expression were determined by RT-PCR. Results Galectin-3 showed a homogeneous distribution in epithelia from control patients. In contrast, in epithelial cells from Crohn's disease lesions, galectin-3 staining was strongly spotted and heterogeneous. In inflamed and reorganized tissue, galectin-3 expression was markedly reduced, and was associated with disintegration of epithelia. Primary cultured epithelial cells as well as HCT-8 cells expressed galectin-3 protein and mRNA. Incubation of HCT-8 cells with tumour necrosis factor alpha (TNF-alpha), but not with other cytokines, substantially reduced galectin-3 expression as shown by semiquantitative RT-PCR. Conclusions Downregulation of galectin-3 in the intestinal epithelium of Crohn's disease patients may be a consequence of enhanced TNF-alpha production by inflammatory cells, thereby contributing to the pathophysiology of the disease. Eur J Gastroenterol Hepatol 14:145-152 (C) 2002 Lippincott Williams Wilkins.

引用

页码：145 / 152

页数：8

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