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Mice harboring a defective epidermal growth factor receptor (waved-2) have an increased susceptibility to acute dextran sulfate-induced colitis.

Abstract：

BACKGROUND:It has been reported that epithelial growth factor (EGF) and transforming growth factor-alpha (TGF-alpha) play an important role in colonic mucosal defense and repair. Waved-2 (wa-2) mice harboring a defect EGF-R and phenotypically similar to TGF-alpha knockout mice provide a novel approach to study the role of EGF-R ligands in the maintenance and repair of colonic mucosa. METHODS:Acute colonic mucosal injury was induced by oral administration of dextran sodium sulfate (DSS: 5 g%) given for 6 days ad libitum to wa-2 homozygotes and their genetic controls (n = 10, each group), as well as to wa-2 mice with and without exogenous EGF administration. Severity of colonic injury was assessed histologically of the entire colon and graded. A crypt damage score (CDS) reflecting all three grades of mucosal pathology was calculated. Decrease in total body weight, colon length and colonic blood content was determined for all groups. RESULTS:Thirty-eight percent of the entire colonic mucosa was destroyed in wa-2 animals compared to 15% in control mice. The CDS was 16.0 +/- 1.4 and 9.6 +/- 0.8 in wa-2 and control mice, respectively. EGF application to wa-2 mice did not reduce the severity of mucosal injury (CDS: 18.9 +/- 1.7 and 19.4 +/- 2.1 in EGF and vehicle injected mice, respectively). CONCLUSIONS:The increased susceptibility of wa-2 mice to DSS demonstrates the pivotal role of EGF-R ligands such as EGF and TGF-alpha in preserving the integrity of the colonic mucosa against mucosal injury. The missing beneficial effect of exogenous EGF administration in these mice further underlines the importance of an intact ligand/EGF-R pathway.

journal_name

Scand J Gastroenterol

journal_title

Scandinavian journal of gastroenterology

authors

Egger B,Büchler MW,Lakshmanan J,Moore P,Eysselein VE

doi

10.1080/003655200750056664

subject

Has Abstract

pub_date

2000-11-01 00:00:00

pages

1181-7

issue

11

eissn

0036-5521

issn

1502-7708

journal_volume

35

pub_type

杂志文章

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