Recombinant Gas6 augments Axl and facilitates immune restoration in an intracerebral hemorrhage mouse model
L Tong, A Shao, Y Ou, Z Guo… - Journal of Cerebral …, 2017 - journals.sagepub.com
L Tong, A Shao, Y Ou, Z Guo, A Manaenko, BJ Dixon, J Tang, M Lou, JH Zhang
Journal of Cerebral Blood Flow & Metabolism, 2017•journals.sagepub.comAxl, a tyrosine kinase receptor, was recently identified as an essential component regulating
innate immune response. Suppressor of cytokine signaling 1 and suppressor of cytokine
signaling 3 are potent Axl-inducible negative inflammatory regulators. This study
investigated the role of Axl signaling pathway in immune restoration in an autologous blood-
injection mouse model of intracerebral hemorrhage. Recombinant growth arrest-specific 6
(Gas6) and R428 were administrated as specific agonist and antagonist. In vivo knockdown …
innate immune response. Suppressor of cytokine signaling 1 and suppressor of cytokine
signaling 3 are potent Axl-inducible negative inflammatory regulators. This study
investigated the role of Axl signaling pathway in immune restoration in an autologous blood-
injection mouse model of intracerebral hemorrhage. Recombinant growth arrest-specific 6
(Gas6) and R428 were administrated as specific agonist and antagonist. In vivo knockdown …
Axl, a tyrosine kinase receptor, was recently identified as an essential component regulating innate immune response. Suppressor of cytokine signaling 1 and suppressor of cytokine signaling 3 are potent Axl-inducible negative inflammatory regulators. This study investigated the role of Axl signaling pathway in immune restoration in an autologous blood-injection mouse model of intracerebral hemorrhage. Recombinant growth arrest-specific 6 (Gas6) and R428 were administrated as specific agonist and antagonist. In vivo knockdown of Axl or suppressor of cytokine signaling 1 and suppressor of cytokine signaling 3 by siRNA was applied. After intracerebral hemorrhage, the expression of endogenous Axl, soluble Axl, and Gas6 was increased, whereas the expression of suppressor of cytokine signaling 1 and suppressor of cytokine signaling 3 was inhibited. Recombinant growth arrest-specific 6 administration alleviated brain edema and improved neurobehavioral performances. Moreover, enhanced Axl phosphorylation with cleavage of soluble Axl (sAxl), and an upregulation of suppressor of cytokine signaling 1 and suppressor of cytokine signaling 3 were observed. In vivo knockdown of Axl and R428 administration both abolished the effect of recombinant growth arrest-specific 6 on brain edema and also decreased the expression suppressor of cytokine signaling 1 and suppressor of cytokine signaling 3. In vivo knockdown of suppressor of cytokine signaling 1 and suppressor of cytokine signaling 3 aggravated cytokine releasing despite of recombinant growth arrest-specific 6. In conclusion, Axl plays essential role in immune restoration after intracerebral hemorrhage. And recombinant growth arrest-specific 6 attenuated brain injury after intracerebral hemorrhage, probably by enhancing Axl phosphorylation and production of suppressor of cytokine signaling 1 and suppressor of cytokine signaling 3.
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