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Stress-Enhanced Fear Learning, a Robust Rodent Model of Post-Traumatic Stress Disorder
Published on: October 13, 2018
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TrkA-cholinergic signaling modulates fear encoding and extinction learning in PTSD-like behavior
Sudhirkumar Yanpallewar1, Francesco Tomassoni-Ardori2, Mary Ellen Palko2
1Neural Development Section, Mouse Cancer Genetics Program, Center for Cancer Research, National Cancer Institute, Frederick, MD, 21702, USA. yanpalls@mail.nih.gov.
Translational Psychiatry
|March 18, 2022
Summary
Enhancing brain cholinergic signaling may reduce fear responses in post-traumatic stress disorder (PTSD). This research suggests potential new treatments for PTSD by targeting acetylcholine pathways, possibly using existing dementia drugs.
Area of Science:
- Neuroscience
- Pharmacology
- Psychiatry
Background:
- Post-traumatic stress disorder (PTSD) is a debilitating condition often treated with exposure therapy.
- Cholinergic signaling in the basal forebrain to hippocampus pathway is crucial for fear response and cognitive flexibility.
- Cognitive enhancers are being explored to augment PTSD therapies.
Purpose of the Study:
- To investigate the role of enhanced cholinergic activity in modulating fear responses.
- To explore the potential of targeting cholinergic signaling for PTSD treatment.
Main Methods:
- A genetic strategy was used to increase cholinergic activity via NGF receptor TrkA signaling in mice.
- Fear response, extinction learning, and stress-induced PTSD-like behaviors were assessed.
- Pharmacological interventions (GABA antagonist/agonist, donepezil) were employed.
Main Results:
- Increased cholinergic activity selectively attenuated fear response and expression during extinction.
- GABAergic modulation influenced cholinergic effects on fear circuits.
- Enhanced cholinergic signaling reduced fear processing under stress and promoted extinction learning in a PTSD model.
- Donepezil augmented extinction learning in a PTSD-like behavior model.
Conclusions:
- Augmenting brain cholinergic signaling can reduce fear responses relevant to PTSD.
- This pathway presents a potential therapeutic target for PTSD treatment.
- Existing drugs like donepezil may be repurposed to enhance exposure therapy for PTSD.
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