MicroRNA-27a-3p relieves inflammation and neurologic impairment after cerebral ischaemia reperfusion via inhibiting lipopolysaccharide induced TNF factor and the TLR4/NF-κB pathway.

Cerebral ischaemia reperfusion (CIR) affects microRNA (miR) expression and causes substantial inflammation. Here, we investigated the influence and underlying mechanism of miR-27a-3p in rats with CIR. First, biliverdin treatment relieved cerebral infarction and decreased the levels of serum interleukin (IL)-1β, IL-6, and TNF-α. Through our previous study, we found key miR-27a-3p and its targeted gene LITAF might involve in the molecular mechanism of CIR. Then, the regulation between miR-27a-3p and LITAF was verified by the temporal miR-27a-3p and LITAF expression profiles and luciferase assay. Moreover, intracerebroventricular injection of the miR-27a-3p mimic significantly decreased the LITAF, TLR4, NF-κB, and IL-6 levels at 24 h post-surgery, whereas miR-27a-3p inhibitor reversed these effects. Furthermore, miR-27a-3p mimic could relieve cerebral infarct and neurologic deficit after CIR. In addition, injection of miR-27a-3p mimic decreased neuronal damage induced by CIR. Taken together, our results suggest that miR-27a-3p protects against CIR by relieving inflammation, neuronal damage, and neurologic deficit via regulating LITAF and the TLR4/NF-κB pathway.