miRNA-323a-3p promoted intracranial, aneurysm-induced inflammation via AMPK/NF-κB signaling pathway by AdipoR1

Background. An intracranial arterial wall which locally protrudes outward, typically in the capsule and fusiform, is called an intracranial aneurysm (IA). Among these aneurysms, 1-2% might spontaneously rupture before treatment. Anterior and posterior communicating aneurysms are more likely to rupture than other aneurysms, and an anterior communicating aneurysm is more likely to rupture than a posterior communicating aneurysm. Objectives. To identify the effects of miRNA-323a-3p expression in intracranial aneurysms and its potential regulatory mechanism. Materials and methods. Patients with IA and healthy volunteers were enrolled, and their serum samples were extracted for the detection of tumor necrosis factor alpha (TNF-alpha), interleukin 1 beta (IL-1 beta), IL-6, IL-18, and miRNA-323a-3p. Then, the regulatory effects of miRNA-323a-3p on the above inflammatory factors and AdipoR1/AMPK/NF-kb signaling were also detected in vitro. Results. The downregulation of miRNA-323a-3p reduced the expression of inflammatory factors (TNF-alpha, IL-1 beta, IL-6, and IL-18) in an in vitro model in comparison with the control group. The overexpression of miRNA-323a-3p suppressed the protein expression of adiponectin receptor R1 (AdipoR1) and p-AMPK, and induced NF-kappa B-p65 protein expression in an in vitro model. Conclusions. We showed that AdipoR1 plasmid, AMPK activator 1 or si-NF-kappa B reduced the pro-inflammatory effects of miRNA-323a-3p in an in vitro model. The miRNA-323a-3p exacerbated the inflammatory reaction in IA through AMPK/NF-kappa B signaling by AdipoR1. Our findings suggest that miRNA-323a-3p targeting AdipoR1 is promising in further anti-inflammatory treatment of IAs.