MiR-190a potentially ameliorates postoperative cognitive dysfunction by regulating Tiam1

Area of Science:

• Neuroscience
• Molecular Biology
• Genetics

Background:

• Postoperative cognitive dysfunction (POCD) is a prevalent concern, particularly in elderly patients, with largely unknown underlying mechanisms.
• While microRNAs (miRNAs) are implicated, their specific roles in POCD remain underexplored.
• This study aims to identify POCD-associated miRNAs and their target genes in hippocampal tissue.

Purpose of the Study:

• To screen for differentially expressed miRNAs in the hippocampus of mice models of POCD.
• To investigate the target genes and biological functions of identified miRNAs implicated in POCD.
• To explore the potential of specific miRNAs as predictive indicators for POCD.

Main Methods:

• Utilized miRNA microarray analysis on hippocampal tissues from POCD model and normal mice (discovery and replication cohorts).
• Performed weighted gene co-expression network analysis (WGCNA) to identify miRNA-gene interactions.
• Employed bioinformatics tools (miRWalk3.0, ClueGO) for target gene prediction and pathway analysis.

Main Results:

• Identified nine significant miRNAs associated with POCD, with mmu-miR-190a-3p being the most prominent.
• WGCNA revealed mmu-miR-190a-3p's significant anti-correlation with a module enriched in axon guidance and calcium signaling pathways.
• Found 169 genes correlated with mmu-miR-190a-3p, including Tiam1, identified as a central regulated gene.

Conclusions:

• Concluded that mmu-miR-190a-3p plays a role in the etiology of POCD.
• Proposed mmu-miR-190a-3p as a potential novel predictive biomarker for POCD.