LncRNA CRNDE Deteriorates Delayed Encephalopathy After Acute Carbon Monoxide Poisoning to Inactivate AKT/GSK3β/β-catenin Pathway via miR-212-5p.

Abstract

Delayed encephalopathy after acute carbon monoxide poisoning (DEACMP) is the most serious sequel of acute CO poisoning, with structure or function injury of the brain. LncRNA colorectal neoplasia differentially expressed (CRNDE) aberrant expression was involved in nerve cell injury; however, the mechanism of CRNDE in DEACMP remains elusive. CO poisoning model of Sprague-Dawley rats was established. Neurological function was measured by Morris water maze (MWM) testing. Histopathological condition of brain and hippocampus tissues was observed by hematoxylin and eosin (H&E), Nissl, and TUNEL staining. Pro-inflammatory cytokine levels were evaluated by enzyme-linked immunosorbent assay (ELISA). Oxidative damage and apoptosis markers were determined by related detection assays. Cell apoptosis were evaluated by flow cytometry analysis. Luciferase report and RNA immunoprecipitation (RIP) assays were employed to identify the binding relationship of CRNDE and miR-212-5p. CRNDE was significantly increased in CO poisoning animal model and oxygen-glucose deprivation (OGD) group, while that of miR-212-5p was decreased. CRNDE knockdown repressed the histopathological damage and apoptosis of brain and hippocampus tissues. Besides, CRNDE suppressed the AKT/GSK3β/β-catenin signaling pathway via targeting miR-212-5p. Furthermore, the protective effects of CRNDE silencing on brain tissue injury and apoptosis and AKT/GSK3β/β-catenin signaling pathway were reversed by inhibition of miR-212-5p in CO poisoning model. Collectively, CRNDE, serving as a sponge of miR-212-5p, aggravated the injury and apoptosis of brain and hippocampus tissues through regulating AKT/GSK3β/β-catenin signaling pathway under the CO-poisoning and OGD-treated model, suggesting a selected therapeutic target of DEACMP.