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A role for miR-132 in learned safety.
Marianne Ronovsky1, Alice Zambon1, Ana Cicvaric1
1Department of Neurophysiology and Neuropharmacology, Center for Physiology and Pharmacology, Medical University of Vienna, Vienna, Austria.
Scientific Reports
|January 26, 2019
Summary
Learned safety, a mechanism inhibiting fear, is regulated by specific microRNAs (miRNAs) in the brain. This study identifies miR-132 as a key molecule in learned safety, offering potential for treating fear and stress disorders.
Area of Science:
- Neuroscience
- Molecular Biology
- Genetics
Background:
- Learned safety is a crucial mechanism for regulating fear responses and promoting positive affective states.
- Understanding the molecular underpinnings of learned safety is vital for developing treatments for psychiatric disorders like PTSD and depression.
- Current knowledge of the molecular mechanisms governing learned safety is limited.
Purpose of the Study:
- To investigate the molecular mediators of learned safety, with a specific focus on microRNA (miRNA) expression in the basolateral amygdala (BLA).
- To identify specific miRNAs involved in learned safety.
- To determine the functional role of miR-132 in learned safety at behavioral and neuronal levels.
Main Methods:
- Comparison of miRNA expression profiles in mice trained for learned safety versus learned fear.
- In vivo transfection using miRNA mimics for gain-of-function studies.
- Utilizing miR-132/212 knockout mice for loss-of-function studies.
- Bioinformatic analysis to identify potential miR-132 target genes, followed by experimental validation.
Main Results:
- Six safety-related miRNAs were identified, including three members of the miR-132/212 family.
- miR-132 was confirmed to be functionally relevant for learned safety at both behavioral and neuronal levels.
- PTEN and GAT1 were identified and validated as novel target genes of miR-132.
Conclusions:
- This study provides the first evidence for amygdala miRNA regulation in learned safety.
- miR-132 is proposed as a signature molecule for learned safety.
- Findings suggest miR-132's potential role in preclinical and translational research for fear and stress-related disorders.
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