miR-206-3p Targets Brain-Derived Neurotrophic Factor and Affects Postoperative Cognitive Function in Aged Mice

Area of Science:

• Neuroscience
• Molecular Biology
• Genetics

Background:

• Postoperative cognitive dysfunction (POCD) significantly impacts patient quality of life.
• Noncoding RNAs, including microRNAs (miRNAs), are implicated in POCD mechanisms, but pathways are unclear.

Purpose of the Study:

• To identify key microRNAs (hub miRNAs) regulating postoperative cognitive function.
• To elucidate the underlying molecular mechanisms of these hub miRNAs in POCD.

Main Methods:

• Bioinformatic analysis to identify hub miRNAs.
• Real-time quantitative PCR to determine miRNA expression in mouse hippocampus.
• In vitro and in vivo models to assess the functional impact of miR-206-3p on neuroinflammation and cognition.

Main Results:

• Six differentially expressed hub miRNAs were identified.
• miR-206-3p was selected for further study due to its conservation.
• Inhibition of miR-206-3p reduced proinflammatory cytokine release, suppressed microglial activation, and improved cognitive function in mice by regulating BDNF.

Conclusions:

• miR-206-3p plays a significant role in modulating neuroinflammation and cognitive function post-surgery.
• miR-206-3p represents a potential therapeutic target for the treatment of postoperative cognitive dysfunction.