Netrin-1 attenuates brain injury after middle cerebral artery occlusion via downregulation of astrocyte activation in mice

Journal of Neuroinflammation

Yanqun Liu¹  Falei Yuan²  Aiguo Xuan³  Xiaohong Lin³  Dahong Long³  Xiaosong He³  Guo-Yuan Yang⁴  Zhijun Zhang⁴  Yongting Wang⁴ 

[1] Department of Neurology, Changhai Hospital, Naval Military Medical University;Hailisheng Biomarine Research Institute;Key Laboratory of Neuroscience, the Second Affiliated Hospital Guangzhou Medical University;Neuroscience and Neuroengineering Research Center, Med-X Research Institute and School of Biomedical Engineering, Shanghai Jiao Tong University;

关键词: Astrocyte;    Brain;    Ischemia;    Inflammation;    Netrin-1;    UNC5H2;   

DOI  :  10.1186/s12974-018-1291-5

来源: DOAJ

【 摘 要 】

Abstract Background Netrin-1 functions largely via combined receptors and downstream effectors. Evidence has shown that astrocytes express netrin-1 receptors, including DCC and UNC5H2. However, whether netrin-1 influences the function of astrocytes was previously unknown. Methods Lipopolysaccharide was used to stimulate the primary cultured astrocytes; interleukin release was used to track astrocyte activation. In vivo, shRNA and netrin-1 protein were injected in the mouse brain. Infarct volume, astrocyte activation, and interleukin release were used to observe the function of netrin-1 in neuroinflammation and brain injury after middle cerebral artery occlusion. Results Our results demonstrated that netrin-1 reduced lipopolysaccharide-induced interleukin-1β and interleukin-12β release in cultured astrocytes, and blockade of the UNC5H2 receptor with an antibody reversed this effect. Additionally, netrin-1 increased p-AKT and PPAR-γ expression in primary cultured astrocytes. In vivo studies showed that knockdown of netrin-1 increased astrocyte activation in the mouse brain after middle cerebral artery occlusion (p < 0.05). Moreover, injection of netrin-1 attenuated GFAP expression (netrin-1 0.27 ± 0.06 vs. BSA 0.62 ± 0.04, p < 0.001) and the release of interleukins and reduced infarct volume after brain ischemia (netrin-1 0.27 ± 0.06 vs. BSA 0.62 ± 0.04 mm3, p < 0.05). Conclusion Our results indicate that netrin-1 is an important molecule in regulating astrocyte activation and neuroinflammation in cerebral ischemia and provides a potential target for ischemic stroke therapy.

【 授权许可】

Unknown