NF-kappaB/I-kappaB pathway during ischemia reperfusion injury of rat liver.
- Author:
Jun XU
1
;
Jun XIE
;
Minsheng BAO
;
Zhengzhong LI
;
Zhen YANG
Author Information
- Publication Type:Journal Article
- MeSH: Animals; Blotting, Western; Electrophoresis; I-kappa B Proteins; metabolism; Liver; blood supply; metabolism; Male; NF-kappa B; metabolism; Rats; Rats, Wistar; Reperfusion Injury; metabolism; Reverse Transcriptase Polymerase Chain Reaction
- From: Chinese Medical Journal 2003;116(8):1146-1149
- CountryChina
- Language:English
-
Abstract:
OBJECTIVETo determine the role of the NF-kappaB/I-kappaB pathway during ischemia reperfusion (I/R) injury to rat liver.
METHODSA group of rats underwent partial hepatic ischemia and reperfusion. The left and median lobe of the liver was subjected to ischemia for 90 minutes followed by reperfusion for previously specified periods. NF-kappaB activity was analyzed by electrophoretic mobility shift assay (EMSA). The protein level of I-kappaB was assessed using Western blot analysis. A semiquantitative reverse transcriptase polymerase chain reaction was used to analyze TNF-alpha and ICAM-1 mRNA levels.
RESULTSDuring liver I/R injury, NF-kappaB activation was induced in a time-dependent fashion. NF-kappaB was activated within 1 hour and 2 hours after the initiation of reperfusion and decreased afer 4 hours. The I-kappaB protein level was decreased in the cytoplasm after 2 hours, and the messenger RNA expression of TNF-alpha and ICAM-1 were increased simultaneously.
CONCLUSIONSThe data suggest that I-kappaB protein was degraded during hepatic I/R injury, NF kappaB was released and bound to special sequence in the promoters of budget genes, which regulated the expression of TNF-alpha and ICAM-1 mRNA. This provides evidence that the NF-kappaB/I-kappaB pathway plays an important modulating role in the expression of proinflammatory genes relevant to the development of ischemia reperfusion injury.
