Heterogeneous expression of human cathelicidin hCAP18/LL-37 in inflammatory bowel diseases.

Abstract:

BACKGROUND:Inflammatory bowel diseases (IBDs) are characterized by a breakdown of colon epithelial barrier function. Antimicrobial peptides like cathelicidins are molecules of the innate immune system located at epithelial surfaces. Cathelicidins influence microbial growth and inflammation and may play a role in IBD. In this study, the expression of human cathelicidin hCAP18/LL-37 was investigated in the intestinal mucosa from patients suffering from ulcerative colitis or Crohn's disease. METHODS:Biopsy material from colon and ileal mucosa of a total of 89 patients (34 with Crohn's disease, 27 with ulcerative colitis, 28 control patients) was evaluated for cathelicidin expression by real-time reverse-transcriptase polymerase chain reaction and immunohistochemistry. Colon epithelial cells were stimulated in vitro with various cytokines to evaluate mechanisms that influence cathelicidin production. RESULTS:Cathelicidin expression was significantly increased in inflamed and non-inflamed colon mucosa from ulcerative colitis patients compared to non-inflamed control mucosa. In patients with Crohn's disease cathelicidin expression was not changed in inflamed or non-inflamed colon or ileal mucosa independent of NOD2 status. Biopsies evaluated by immunohistochemistry showed epithelial cathelicidin expression in the upper crypt that was diffuse in controls and only basal in IBD patients. Inflammation mediators, alone or in combination with the known cathelicidin inducer butyrate, had no effect on cathelicidin expression in cultured colon cells. CONCLUSIONS:In IBD the colonic expression of human cathelicidin is altered: cathelicidin expression is increased in inflamed and non-inflamed mucosa in patients suffering from ulcerative colitis but not in Crohn's disease. This deficiency may further compromise the antimicrobial barrier in Crohn's disease.

authors

Schauber J,Rieger D,Weiler F,Wehkamp J,Eck M,Fellermann K,Scheppach W,Gallo RL,Stange EF

doi

10.1097/00042737-200606000-00007

subject

Has Abstract

pub_date

2006-06-01 00:00:00

pages

615-21

issue

6

eissn

0954-691X

issn

1473-5687

pii

00042737-200606000-00007

journal_volume

18

pub_type

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