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Published on: October 1, 2012
Increased disease activity in eNOS-deficient mice in experimental colitis
M Sasaki1, S Bharwani, P Jordan
1Department of Molecular and Cellular Physiology, LSU Health Sciences Center, Shreveport, LA 71130-3932, USA.
Free Radical Biology & Medicine
|December 19, 2003
Summary
Endothelial nitric oxide synthase (eNOS) protects the gut from inflammatory bowel disease (IBD) injury. Mice lacking eNOS experienced significantly worse colitis, highlighting eNOS
Area of Science:
- Gastroenterology
- Immunology
- Molecular Biology
Background:
- Experimental colitis models mimic human inflammatory bowel disease (IBD).
- Nitric oxide synthases (NOS) are implicated in IBD pathogenesis.
- The specific role of endothelial nitric oxide synthase (eNOS) in IBD remains unclear.
Purpose of the Study:
- To investigate the role of endothelial nitric oxide synthase (eNOS) in dextran sodium sulfate (DSS)-induced experimental colitis.
- To compare disease severity in wild-type (eNOS+/+) and eNOS-deficient (eNOS-/-) mice.
Main Methods:
- Induction of experimental colitis using 3% dextran sodium sulfate (DSS) in drinking water.
- Comparison of disease activity, weight loss, stool blood, and histopathology between eNOS+/+ and eNOS-/- mice.
- Assessment of leukocyte infiltration and MAdCAM-1 expression in the gut tissue.
Main Results:
- DSS administration induced colitis in both mouse strains.
- eNOS-deficient mice exhibited significantly increased disease activity compared to wild-type controls.
- Histological analysis revealed greater gut injury, leukocyte infiltration, and MAdCAM-1 expression in eNOS-/- mice.
Conclusions:
- Endothelial nitric oxide synthase (eNOS) plays a protective role in limiting intestinal injury during experimental colitis.
- eNOS deficiency exacerbates colitis severity.
- Altered eNOS activity may contribute to the pathogenesis of human inflammatory bowel disease.
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