• Yiping Ding, Jinhong Qian, Haiying Li, Haitao Shen, Xiang Li, Yan Kong, Zhuan Xu, and Gang Chen.
• Department of Neurology, The First Affiliated Hospital of Soochow University, 188 Shizi Street, Suzhou, Jiangsu Province, 215006, China.
• Neurosci. Res. 2019 May 1; 142: 58-68.

AbstractInhibition of Janus kinases 2-Signal transducers and activators of transcription3 (JAK2-STAT3) pathway has been shown to exert anti-inflammatory actions. SC99, a novel specific inhibitor targeting JAK2-STAT3 pathway, has been verified to negatively modulate platelet activation and aggregation in vitro. In current study, a middle cerebral artery occlusion and reperfusion (MCAO/R) model was established in Sprague Dawley rats and primary cultured microglia was exposed to oxygen and glucose deprivation (OGD/R) in vitro. Different dosages were employed to detect the effects of SC99 on cerebral ischemia-perfusion (I/R) injury and evaluate the underlying mechanisms. Our results showed that intracerebroventricular injection of SC99 (10 mmol/L, 15 μL) produced an effective inhibitory effect on the phosphorylation of JAK2 and STAT3. Correspondingly, SC99 ameliorated neuronal apoptosis and degeneration, neurobehavioral deficits, inflammatory response and brain edema. And SC99 promoted microglia polarization to an anti-inflammatory M2 phenotype. We concluded that SC99 could alleviate brain damage and play an anti-inflammatory action by promoting microglia polarization to an anti-inflammatory phenotype after I/R injury, which provides an emerging and promising alternative to protect the brain against MCAO/R injury in the future investigations.Copyright © 2018 Elsevier B.V. and Japan Neuroscience Society. All rights reserved.

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