• Hyun-Chang Kim, Eugene Kim, Jung Il Bae, Kook Hyun Lee, Young-Tae Jeon, Jung-Won Hwang, Young-Jin Lim, Seong-Won Min, and Hee-Pyoung Park.
• *Department of Anesthesiology and Pain Medicine, Keimyung University Dongsan Hospital, Keimyung University College of Medicine †Department of Anesthesiology and Pain Medicine, Hospital of Catholic University of Daegu, Daegu ‡Department of Anesthesiology and Pain Medicine, Seoul National University Hospital ∥Department of Anesthesiology and Pain Medicine, SMG-SNU Boramae Medical Center, Seoul National University College of Medicine, Seoul §Department of Anesthesiology and Pain Medicine, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea.
• J Neurosurg Anesthesiol. 2017 Jan 1; 29 (1): 37-45.

BackgroundThe antiapoptotic effects of sevoflurane postconditioning are responsible for neuroprotection against cerebral ischemia-reperfusion injury. Phosphorylation of the Janus family tyrosine kinases (JAK) 2-signal transducers and activators of transcription (STAT) 3 pathway is linked to antiapoptosis. Here, we determined whether the antiapoptotic effects of sevoflurane postconditioning are associated with activation of the JAK2-STAT3 pathway after global transient cerebral ischemia in rats.Materials And MethodsForty-five rats were randomly assigned to 5 groups: sham (n=5), control (10 min of ischemia, n=10), sevoflurane postconditioning (2 periods of sevoflurane inhalation after ischemia for 10 min, n=10), AG490 (a JAK2 selective inhibitor, intraperitoneal administration of 40 mg/kg before ischemia, n=10), and sevoflurane postconditioning plus AG490 group (n=10). The number of apoptotic cells as well as the expression of JAK2, phosphorylated JAK2 (P-JAK2), STAT3, phosphorylated STAT3 (P-STAT3), Bcl-2 (antiapoptotic protein), and Bax (proapoptotic protein) were evaluated 3 days after ischemia.ResultsThe apoptotic cell count was significantly lower in the sevoflurane postconditioning group than in the control, AG490, and sevoflurane postconditioning plus AG490 groups. JAK2 and STAT3 levels were comparable among all 5 groups. P-JAK2, P-STAT3, and Bcl-2 levels were higher and Bax levels were lower in the sevoflurane postconditioning group relative to the control, AG490, and sevoflurane postconditioning plus AG490 groups.ConclusionsSevoflurane postconditioning reduced apoptosis by increasing P-JAK and P-STAT expression after transient global ischemia in rats, and AG490 reversed the beneficial antiapoptotic effects of sevoflurane postconditioning, suggesting that the JAK-STAT pathway may be involved in the antiapoptotic mechanism of sevoflurane postconditioning.

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