Down-Regulation of Endothelial Adhesion Molecules and Leukocyte Adhesion by Treatment with Superoxide Dismutase Is Beneficial in Chronic Immune Experimental Colitis

Abstract

Modulation of adhesion molecule expression that govern trafficking of leukocytes into the inflamed intestine is envisioned as a new strategy for treatment of inflammatory bowel disease (IBD). This study was designed to determine the impact of reducing oxidative stress on adhesion molecules expression and leukocyte recruitment in experimental chronic colitis. For that purpose, colitic interleukin‐10 knockout and wild‐type mice were studied. Groups of animals were treated with Cu/Zn superoxide dismutase (SOD1) 13 mg/kg/d or vehicle for either 7 or 14 days. Expression of vascular cell adhesion molecule‐1 and mucosal addressin cell adhesion molecule‐1 were determined; leukocyte‐endothelial cell interactions in colonic venules were studied with intravital microscopy; and changes in colon pathology and biomarkers of colitis severity were determined. Development of colitis was associated with a marked increase in endothelial vascular cell adhesion molecule‐1 and mucosal addressin cell adhesion molecule‐1 expression, which were significantly reduced by treatment with SOD1. The increase in leukocyte rolling and adhesion in colonic venules of colitic mice were significantly reduced by administration of SOD1. This treatment markedly reduced colonic lipid hydroperoxidation, myeoloperoxidase activity, and plasma levels of serum amyloid A protein and resulted in significant, although modest, reductions in histologic damage score. The therapeutic value of SOD1 when administered prophylactically was assessed in the dextran sulfate sodium model of colitis with similar positive results. These results indicate that SOD1 affords significant amelioration of colonic inflammatory changes in experimental colitis. Down‐regulation of adhesion molecule expression, reduction of lipid hydroperoxidation, and recruitment of leukocytes into the inflamed intestine contribute to this beneficial effect.

Inhibitory effects of an aqueous extract of Cornus kousa Burg. Leaves on TNF-α-induced chemokine expression and monocyte adhesion to human colonic epithelial cells

“…In epithelial dysfunction, the infiltration of inflammatory cells into the mucosal barriers resulted in the overproduction of ROS (Kankuri et al, 2001;Nakase et al, 2001). The administration of free radical scavenging agents including vitamin E and superoxide dismutase exerted a beneficial effect against experimental colitis (Segui et al, 2005;Araki et al, 2006;Isozaki et al, 2006). Our results imply that the antioxidant components of ACK could be of potential value in inflammatory conditions.…”

Lemon Verbena Infusion Consumption Attenuates Oxidative Stress in Dextran Sulfate Sodium-Induced Colitis in the Rat

“…Similarly, in a TNBS model, Ginkgo biloba extract stimulated SOD activity, associated with a decrease in colonic lipid peroxidation [40]. Furthermore, it has been shown in colitic interleukin-10 knockout mice that treatment with SOD significantly reduced lipid peroxidation [41]. Such a link can be suggested in our work, since colonic MDA content decreased significantly after lemon verbena infusion consumption.…”

Involvement of NF-κB in the inhibitory actions of Platycarya strobilacea on the TNF-α-induced monocyte adhesion to colon epithelial cells and chemokine expression

“…It has been known that infiltration of inflammatory cells into the mucosal lesions overproduces ROS (Nakase et al, 2001;Kankuri et al, 2001), and that free radical scavenging agents including Vit.E and superoxide dismutase have beneficial effect against experimental colitis (Segui et al, 2005;Araki et al, 2006;Isozaki et al, 2006). Furthermore, clinically used drugs for IBD, sulfasalazine and 5-aminosalicylic acid, are also thought to scavenge ROS at the inflammatory sites of IBD (Craven et al, 1987;Ardizzone et al, 1998).…”