Upregulation of P-selectin and Intercellular Adhesion Molecule-1 after Retinal Ischemia-Reperfusion Injury

2003 ◽  
Vol 44 (11) ◽  
pp. 4931 ◽  
Author(s):  
Akiko Nishiwaki ◽  
Takashi Ueda ◽  
Shinya Ugawa ◽  
Shoichi Shimada ◽  
Yuichiro Ogura
Keyword(s):  
Reperfusion Injury ◽  
Adhesion Molecule ◽  
Ischemia Reperfusion Injury ◽  
Ischemia Reperfusion ◽  
Retinal Ischemia ◽  
Intercellular Adhesion ◽  
Intercellular Adhesion Molecule ◽  
Intercellular Adhesion Molecule 1

Effects of NF-κB inhibition on mesenteric ischemia-reperfusion injury

2003 ◽  
Vol 284 (4) ◽  
pp. G713-G721 ◽  
Author(s):  
Lei Zou ◽  
Bashir Attuwaybi ◽  
Bruce C. Kone
Keyword(s):  
Reperfusion Injury ◽  
Tyrosine Phosphorylation ◽  
Adhesion Molecule ◽  
Interleukin 6 ◽  
Mesenteric Ischemia ◽  
Ischemia Reperfusion Injury ◽  
Ischemia Reperfusion ◽  
Intercellular Adhesion ◽  
Intercellular Adhesion Molecule ◽  
Intercellular Adhesion Molecule 1

Mesenteric ischemia-reperfusion injury is a serious complication of shock. Because activation of nuclear factor-κB (NF-κB) has been implicated in this process, we treated rats with vehicle or the IκB-α inhibitor BAY 11-7085 (25 mg/kg ip) 1 h before mesenteric ischemia-reperfusion (45 min of ischemia followed by reperfusion at 30 min or 6 h) and examined the ileal injury response. Vehicle-treated rats subjected to ischemia-reperfusion exhibited severe mucosal injury, increased myeloperoxidase (MPO) activity, increased expression of interleukin-6 and intercellular adhesion molecule 1 protein, and a biphasic peak of NF-κB DNA-binding activity during the 30-min and 6-h reperfusion courses. In contrast, BAY 11-7085-pretreated rats subjected to ischemia-reperfusion exhibited less histological injury and less interleukin-6 and intercellular adhesion molecule 1 protein expression at 30 min of reperfusion but more histological injury at 6 h of reperfusion than vehicle-treated rats subjected to ischemia-reperfusion. Studies with phosphorylation site-specific antibodies demonstrated that IκB-α phosphorylation at Ser32,Ser36 was induced at 30 min of reperfusion, whereas tyrosine phosphorylation of IκB-α was induced at 6 h of reperfusion. BAY 11-7085 inhibited the former, but not the latter, phosphorylation pathway, whereas α-melanocyte-stimulating hormone, which is effective in limiting late ischemia-reperfusion injury to the intestine, inhibited tyrosine phosphorylation of IκB-α. Thus NF-κB appears to play an important role in the generation and resolution of intestinal ischemia-reperfusion injury through different activation pathways.

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