Integrated Excitatory/Inhibitory Imbalance and Transcriptomic Analysis Reveals the Association between Dysregulated...

Area of Science:

• Neuroscience
• Developmental Biology
• Anesthesiology

Background:

• Developmental exposure to anesthesia may lead to neurotoxicity, causing cognitive and behavioral issues.
• The precise molecular mechanisms underlying these long-term effects remain largely unknown.

Purpose of the Study:

• To investigate the impact of early-life propofol exposure on hippocampal synapse activity and gene expression in adult mice.
• To elucidate the mechanisms behind propofol-induced neurodevelopmental toxicity and cognitive deficits.

Main Methods:

• Electrophysiological analysis of hippocampal synapse activity in P60 mice exposed to propofol at P7.
• Transcriptomic assay of 24,881 mRNA expressions in hippocampal tissues.
• Bioinformatic analysis of differentially expressed genes, focusing on synaptic function.

Main Results:

• Propofol exposure resulted in an excitation/inhibition (E/I) imbalance in hippocampal neurons, characterized by decreased excitation and increased inhibition.
• Abnormal expression of 317 mRNAs, including 23 synapse-related genes, was observed in P60 mice.
• Bioinformatic analyses linked these gene expression changes to impaired synapse function, plasticity, behavior, and cognition.

Conclusions:

• Altered E/I balance in the hippocampus may be a key mechanism for propofol-induced long-term learning and memory impairment.
• Transcriptomic and bioinformatic findings offer potential therapeutic targets for anesthetic neurotoxicity by restoring E/I balance and modifying synaptic gene expression.