miR-4508 Targets PLCB2 in Propofol-Induced Neurotoxicity in SH-SY5Y Cells: Role and Mechanism.

OBJECTIVE: Propofol is a widely administered anesthetic agent given intravenously. This study investigated the function of miR-4508 within propofol-elicited neurotoxicity in SH-SY5Y cells, identified its downstream target genes, and elucidated the underlying molecular regulatory pathway. METHODS: Propofol neurotoxicity was modeled in SH-SY5Y cells with varying concentrations and durations. Cell viability, miR-4508, oxidative stress, and inflammatory cytokines were measured. Target prediction and dual-luciferase validation, along with miRNA inhibitor and rescue experiments, were used to elucidate the regulatory mechanism. Cognitive function and hippocampal miR-4508 expression were also preliminarily assessed in propofol-exposed mice using the Morris water maze and RT-qPCR, respectively. RESULTS: Propofol reduced SH-SY5Y cell viability and upregulated miR-4508 in a manner dependent on both concentration and time, peaking at 50 μM for 24 h. Five candidate targets were identified bioinformatically. PLCB2 was most downregulated by miR-4508 overexpression. A dual-luciferase assay verified that miR-4508 directly binds to the PLCB2 3'-UTR. A miR-4508 inhibitor attenuated propofol-induced oxidative stress and inflammation, effects reversed by PLCB2 knockdown. Preliminary in vivo observations suggested impaired learning/memory and increased hippocampal miR-4508 in propofol-treated mice, with miR-4508 inhibition showing a tendency toward reversal of these deficits, though further validation is required. CONCLUSIONS: This study demonstrates that propofol upregulates miR-4508 to suppress PLCB2, driving oxidative stress and neuroinflammation. Forward and reverse rescue experiments confirm the miR-4508/PLCB2 axis as a potential therapeutic target for propofol-induced neurotoxicity.