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Electroconvulsive Seizures in Rats and Fractionation of Their Hippocampi to Examine Seizure-induced Changes in Postsynaptic Density Proteins
Published on: August 15, 2017
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Electroconvulsive Stimulation in Rats Induces Alterations in the Hippocampal miRNome: Translational Implications for
Karen M Ryan1,2, Paul Smyth3, Gordon Blackshields3
1Trinity College Institute of Neuroscience, Trinity College Dublin, Dublin 2, Ireland. kryan7@tcd.ie.
Molecular Neurobiology
|November 22, 2022
Summary
Electroconvulsive stimulation (ECS) alters hippocampal microRNAs (miRNAs) in rats, with some changes translating to human depression. These miRNA alterations may offer insights into depression neurobiology and electroconvulsive therapy (ECT) mechanisms.
Area of Science:
- Neuroscience
- Molecular Biology
- Genetics
Background:
- MicroRNAs (miRNAs) are implicated in depression development and treatment.
- Electroconvulsive therapy (ECT) is an effective treatment for severe depression, but its mechanisms remain unclear.
- Electroconvulsive stimulation (ECS) in rodents serves as an animal model for ECT.
Purpose of the Study:
- To investigate the impact of ECS on hippocampal miRNA expression in rats.
- To explore the translatability of ECS-induced miRNA changes to human depression and ECT treatment.
- To identify potential miRNA biomarkers for depression and ECT response.
Main Methods:
- Next-generation sequencing (NGS) was used to profile hippocampal miRNAs in rats after ECS.
- Quantitative real-time PCR (qRT-PCR) validated differential miRNA expression.
- miRNA levels were assessed in whole blood, frontal cortex, cerebellum, and cerebrospinal fluid from human patients with depression and controls.
- Correlation analyses were performed between miRNA levels and clinical depression severity/treatment response.
Main Results:
- Six hippocampal miRNAs showed significant differential expression in rats post-ECS (three upregulated, three downregulated).
- qRT-PCR confirmed changes in four miRNAs; miR-483 was also reduced in rat frontal cortex.
- In human patients, miR-132 and miR-483 were reduced in whole blood of those with depression.
- Pre-ECT miR-204 levels correlated with depression severity, and changes in serum miR-212 correlated with mood improvement post-ECT.
Conclusions:
- ECS induces significant changes in hippocampal miRNA expression in rats.
- Specific miRNAs (miR-132, miR-483) show altered expression in the blood of patients with depression, suggesting potential biomarkers.
- While ECT did not alter blood miRNA levels in patients, correlations between miRNAs and clinical outcomes suggest a role in treatment response.
- Further research with larger cohorts is needed to confirm these findings and elucidate the role of miRNAs in depression and ECT's mechanism of action.
