MiR-5787 Attenuates Macrophages-Mediated Inflammation by Targeting TLR4/NF-κB in Ischemic Cerebral Infarction.

Accumulating studies have suggested the important role of microRNA (miRNA) in ischemic cerebral infarction. However, little is known of the modifying effect of miR-5787, a newly found miRNA, in ischemic cerebral infarction. We aim to elucidate the effect and underlying molecular mechanism of miR-5787 in the pathogenesis of ischemic cerebral infarction. MiR-5787 is demonstrated to be downregulated in peripheral blood mononuclear cells (PBMCs) samples of patients compared with controls, which is negatively associated with inflammatory cytokines of IL-6 and TNF-α in ischemic cerebral infarction. Besides, the expression of miR-5787 is also negatively related to TLR4, which is unregulated in PBMCs of ischemic cerebral infarction patients. Moreover, TLR4 is demonstrated to be a target of miR-5787 by bioinformatics' analysis and the luciferase reporter assay. In addition, miR-5787 can prevent from the proliferation and migration of macrophages, and attenuate LPS/TLR4-mediated inflammatory response via NF-κB in macrophages. MiR-5787 may be a promising biomarker for ischemic cerebral infarction.