Journal
NEURAL REGENERATION RESEARCH
Volume 17, Issue 8, Pages 1769-1775Publisher
WOLTERS KLUWER MEDKNOW PUBLICATIONS
DOI: 10.4103/1673-5374.332154
Keywords
agomiR-455-5p; biomarker; blood-brain barrier; C-C chemokine receptor type 5; ischemia/reperfusion injury; ischemic stroke; microglia; microRNA-455-5p; neuroinflammation; pretreatment
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Funding
- National Natural Science Foundation of China [82071283, 81671130]
- Medical Engineering Cross Research Foundation of Shanghai Jiao Tong University of China [YG2017MS83]
- Shanghai Municipal Science and Technology Commission Medical Guidance Science and Technology Support Project of China [19411968400]
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This study demonstrates that miR-455-5p could serve as a potential biomarker and therapeutic target for cerebral ischemia/reperfusion injury. It attenuates cerebral ischemia/reperfusion injury by inhibiting the expression of C-C chemokine receptor type 5 and reducing the neuroinflammatory response.
Neuroinflammation is a major pathophysiological factor that results in the development of brain injury after cerebral ischemia/reperfusion. Downregulation of microRNA (miR)-455-5p after ischemic stroke has been considered a potential biomarker and therapeutic target for neuronal injury after ischemia. However, the role of miR-455-5p in the post-ischemia/reperfusion inflammatory response and the underlying mechanism have not been evaluated. In this study, mouse models of cerebral ischemia/reperfusion injury were established by transient occlusion of the middle cerebral artery for 1 hour followed by reperfusion. Agomir-455-5p, antagomir-455-5p, and their negative controls were injected intracerebroventricularly 2 hours before or 0 and 1 hour after middle cerebral artery occlusion (MCAO). The results showed that cerebral ischemia/reperfusion decreased miR-455-5p expression in the brain tissue and the peripheral blood. Agomir-455-5p pretreatment increased miR-455-5p expression in the brain tissue, reduced the cerebral infarct volume, and improved neurological function. Furthermore, primary cultured microglia were exposed to oxygen-glucose deprivation for 3 hours followed by 21 hours of reoxygenation to mimic cerebral ischemia/reperfusion. miR-455-5p reduced C-C chemokine receptor type 5 mRNA and protein levels, inhibited microglia activation, and reduced the production of the inflammatory factors tumor necrosis factor-a and interleukin-1 beta. These results suggest that miR-455-5p is a potential biomarker and therapeutic target for the treatment of cerebral ischemia/reperfusion injury and that it alleviates cerebral ischemia/reperfusion injury by inhibiting C-C chemokine receptor type 5 expression and reducing the neuroinflammatory response.
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