Journal
GASTROENTEROLOGY
Volume 121, Issue 6, Pages 1428-1436Publisher
W B SAUNDERS CO-ELSEVIER INC
DOI: 10.1053/gast.2001.29568
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Funding
- NIDDK NIH HHS [DK 55812, P01 DK 57880-01, DK 70555] Funding Source: Medline
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Background & Aims: Integrins (alpha (4) and beta (2)) and their endothelial ligands vascular cell adhesion molecule-1 (VCAM-1) and intercellular adhesion molecule-1 (ICAM-1) play key roles in leukocyte recruitment to areas of inflammation. ICAM-1 and VCAM-1 are expressed in inflamed intestinal tissues. This study investigates a possible causative role of adhesion molecules ICAM-1, VCAM-1, and alpha (4) integrins in mediating the inflammatory response in a murine model of Crohn's disease (CD). Methods: CD4(+) mesenteric lymph node cells from SAMP-1/Yit donor mice were adoptively transferred into major histocompatibility complex-matched severe combined immunodeficiency disease mice. Six weeks later, these mice were left untreated or treated for 3 days with monoclonal antibodies (mAbs) to ICAM-1, VCAM-1, or both, and alpha (4), or both ICAM-1 and alpha (4), dexamethasone, or nonblocking isotype control antibodies. On day 4 after treatment, tissues were investigated for expression of ICAM-1, VCAM-1, and for severity of inflammation using a semiquantitative inflammatory score. Dexamethasone treatment resolved all measures of intestinal inflammation. Results: Blocking either ICAM-1, VCAM-1, or alpha (4) integrins had no significant beneficial effect. However, blocking ICAM-1 and alpha (4), or blocking ICAM-1 and VCAM-1, showed a 70% resolution of the active inflammation, but not chronic inflammation. Conclusions: These findings suggest that blocking ICAM-1 and VCAM-1 may have therapeutic benefit for the acute inflammatory component of Crohn's disease.
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