MiR-19b-3p Inhibits Hypoxia-Ischemia Encephalopathy by Inhibiting SOX6 Expression via Activating Wnt/β-catenin...

Area of Science:

• Neuroscience
• Molecular Biology
• Biochemistry

Background:

• Hypoxic-ischemic encephalopathy (HIE) is a significant cause of infant mortality and long-term neurological deficits.
• The precise molecular mechanisms underlying HIE pathogenesis remain incompletely understood, necessitating further investigation.

Purpose of the Study:

• To elucidate the role of miR-19b-3p and SOX6 in HIE pathogenesis.
• To investigate the regulatory relationship between miR-19b-3p and SOX6.
• To explore the involvement of the Wnt/β-catenin signaling pathway in HIE.

Main Methods:

• Quantitative real-time PCR (qRT-PCR) to measure miR-19b-3p and SOX6 expression.
• Oxygen-glucose deprivation/reoxygenation (OGD/R) model in HT22 cells to mimic HIE.
• Cell Counting Kit-8 (CCK-8) assay for cell viability.
• Enzyme-linked immunosorbent assay (ELISA) for SOD and MDA levels.
• Flow cytometry for apoptosis analysis.
• Dual-luciferase reporter and RNA pull-down assays to confirm targeting.
• TOPFlash/FOPFlash luciferase assay for Wnt/β-catenin pathway activity.

Main Results:

• Downregulation of miR-19b-3p and upregulation of SOX6 were observed in HIE patients and OGD/R-treated cells.
• Overexpression of miR-19b-3p enhanced cell viability, reduced apoptosis, and mitigated oxidative stress in OGD/R cells.
• miR-19b-3p directly targeted and inhibited SOX6 expression.
• SOX6 knockdown mimicked the protective effects of miR-19b-3p overexpression by activating the Wnt/β-catenin pathway.
• miR-19b-3p exerted protective effects against HIE injury by inhibiting SOX6 and activating the Wnt/β-catenin pathway.

Conclusions:

• miR-19b-3p functions as a protective factor against HIE by suppressing SOX6 expression and modulating the Wnt/β-catenin pathway.
• Targeting the miR-19b-3p/SOX6 axis presents a potential therapeutic strategy for mitigating HIE-induced brain injury.