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-B Activation by Targeting the Proximal End of Tumor Necrosis Factor-
Signaling
From the *Department of Anesthesiology, Zhongshan Hospital, Fudan University, Shanghai, China; and Shanghai Public Health Clinical Center, Fudan University, Shanghai, China.
Address correspondence and reprint requests to Zhanggang Xue, MD, Department of Anesthesiology, Zhongshan Hospital, Fudan University, Fenglin Road 180, Shanghai 200032, China. Address e-mail to xue.zhanggang{at}zs-hospital.sh.cn.
BACKGROUND: Volatile anesthetics interfere with inflammatory cytokine production and expression of adhesion molecules which are critical for ischemia reperfusion induced injury. Nuclear factor (NF)-
B has been reported to be suppressed in this process, but the detailed molecular mechanism is still unclear.
METHODS: In this study, ECV304 (a human umbilical vein endothelial cell line) was preconditioned with 30 min desflurane (1 minimal alveolar concentration), after 15 min washout, 30 min anoxia, and 60 min reoxygenation was performed. ECV304 was finally stimulated with tumor necrosis factor (TNF)-
(10 ng/mL). Control groups, which were not preconditioned and/or not stimulated, were also included in the protocol. IB-, phospho-IB-, phospho-IB kinase (IKK)/IKKβ, and phopho-p38 were detected by Western blotting. The nuclear NF-B p65 subunit was measured by subcellular fractionation and Western blotting. The surface expression of TNF-R1 was measured by flow cytometry. Receptor-associated signaling adaptors, e.g., TNF receptor-associated factor 2 (TRAF2) and IKK-, were evaluated by immunoprecipitation by TNF-R1 antibody and subsequent Western blotting.
RESULTS: Desflurane preconditioning inhibits IB- phosphorylation, degradation, and p65 nuclear localization. Desflurane also affects p38 phosphorylation, which is needed for optimal inflammatory response. The phosphorylation of IKK/IKKβ was suppressed by preconditioning while the surface abundance of TNF-R1 was not affected. The association of TRAF2 and IKK- with TNF-R1 was compromised by desflurane.
CONCLUSIONS: Our results suggest that the molecular target of desflurane in the NF-B pathway is upstream of IKK activation. The abundance of TNF-R1 on the cell membrane is not affected by anesthetic preconditioning. We suggest that desflurane preconditioning targets the proximal end of TNF- signaling.
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