Interferon regulatory factor 4/5 signaling impacts on microglial activation after ischemic stroke in mice.
Interferon regulatory factor 4/5 signaling impacts on microglial activation after ischemic stroke in mice.
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干扰素调节因子 4/5 信号传导对小鼠缺血性中风后小胶质细胞活化的影响。
DOI:
10.1111/ejn.13778
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发表时间:
2018-01
期刊:
影响因子:
--
通讯作者:
Liu F
中科院分区:
文献类型:
--
作者:
Al Mamun A;Chauhan A;Yu H;Xu Y;Sharmeen R;Liu F
Microglial activation is a key element in initiating and perpetuating inflammatory responses to stroke. Interferon regulatory factor 5 (IRF5) and IRF4 signaling have been found critical in mediating macrophage pro‐inflammatory (M1) and anti‐inflammatory (M2) phenotypes, respectively, in peripheral inflammation. We hypothesize that the IRF5/4 regulatory axis also mediates microglial activation after stroke. C57BL6 mice of 8–12 weeks were subject to a 90‐min middle cerebral artery occlusion, and the brains evaluated at 24 h, 3, 10 and 30 days after reperfusion. Flow cytometry was utilized to examine microglial activation and cytokine expression. RT‐PCR was performed for mRNA levels of IRF5/4 in sorted microglia. Microglial expression of IRF5/4 was examined by immunohistochemistry, and brain cytokine levels were determined by ELISA. Our results revealed that the IRF5 mRNA level in sorted microglia increased at 3 days of stroke; whereas IRF4 mRNA level exhibited biphasic increases, with a transient rise at 24 h and a peak at 10 days. The same pattern was seen in IRF5/4 protein colocalization with Iba‐1+ cells by IHC. Intracellular levels of TNF‐α and IL‐1β in microglia peaked at 3 days of stroke, and IL‐4+ IL‐10+ double‐positive microglia significantly increased at day 10. Brain levels of these cytokines were consistent with microglial cytokine changes. Worse behavior test results were seen at 3 days vs. 10 days of stroke. We conclude that microglia phenotypes are dynamic to ischemic stroke, and IRF5/4 signaling may regulate microglial M1/M2 activation and impact on stroke outcomes.
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影响因子:
4.1
作者:
Chen Y;Won SJ;Xu Y;Swanson RA
通讯作者:
Swanson RA
影响因子:
5.1
作者:
Fu, Ruying;Shen, Qingyu;Xu, Pengfei;Luo, Jin Jun;Tang, Yamei
通讯作者:
Tang, Yamei
影响因子:
29
作者:
Courties, Gabriel;Moskowitz, Michael A.;Nahrendorf, Matthias
通讯作者:
Nahrendorf, Matthias
影响因子:
9.3
作者:
Cherry JD;Olschowka JA;O'Banion MK
通讯作者:
O'Banion MK
影响因子:
5.3
作者:
Ji, Shengbo;Kronenberg, Golo;Endres, Matthias
通讯作者:
Endres, Matthias