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Dexmedetomidine does not compromise neuronal viability, synaptic connectivity, learning and memory in a rodent model
Nerea Jimenez-Tellez1,2,3, Fahad Iqbal3, Marcus Pehar2,3
1Department of Biochemistry and Molecular Biology, University of Calgary, Calgary, Canada.
Scientific Reports
|August 10, 2021
Summary
Dexmedetomidine (DEX) shows promise as a safer anesthetic. Studies found DEX non-toxic to neurons in vitro and in vivo, preserving learning and memory in rodent models. Further research supports its potential as a safer anesthetic option.
Area of Science:
- Neuroscience
- Pharmacology
- Cell Biology
Background:
- Concerns exist regarding the long-term cytotoxic effects of common anesthetics on nervous tissue.
- Dexmedetomidine (DEX) is recognized for reduced neurotoxicity and protective effects against other anesthetic-induced cytotoxicity.
- The precise impact of DEX on neuronal growth, synaptic connectivity, and underlying mechanisms requires further elucidation.
Purpose of the Study:
- To investigate the effects of dexmedetomidine (DEX) on neuronal growth, synapse formation in vitro, and learning and memory in vivo.
- To assess the impact of DEX on cellular viability, neurite outgrowth, synaptic assembly, and mitochondrial morphology in rat cortical neurons.
- To evaluate the effects of DEX administration on hippocampal-dependent memory in a rodent model.
Main Methods:
- Rat cortical neurons were exposed to varying concentrations of DEX (0.05–10 µM) to assess cellular viability, neurite outgrowth, synaptic assembly, and mitochondrial morphology.
- Rat pups received subcutaneous injections of DEX (25 µg/kg) on postnatal days 7 and 8.
- Hippocampal-dependent memory was evaluated in freely behaving animals post-DEX administration.
Main Results:
- DEX did not affect neuronal viability below 10 µM; higher concentrations induced significant cell death.
- Neurons exposed to DEX exhibited increased neurite branching but no change in synaptic puncta formation.
- DEX administration did not impair hippocampal-dependent memory in juvenile rats.
- DEX promoted mitochondrial fusion and reduced reactive oxygen species production in vitro.
Conclusions:
- Dexmedetomidine (DEX) demonstrates a non-neurotoxic profile both in vitro and in vivo, supporting its use as a safer anesthetic agent.
- DEX is growth permissive, influences mitochondrial dynamics, and reduces oxidative stress without altering the total number of synaptic connections in vitro.
- This study provides initial evidence for the safety and efficacy of DEX in neuronal development and function.
