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A Novel Pavlovian Fear Conditioning Paradigm to Study Freezing and Flight Behavior
Published on: January 5, 2021
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Hypothalamic-hindbrain circuit for consumption-induced fear regulation
Qin Wang1, Rui-Yue Sun1, Jia-Xue Hu1
1Department of Neurobiology and Department of Psychiatry of the Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China.
Nature Communications
|September 4, 2024
Summary
Animals can suppress fear during feeding via a newly discovered brain circuit. This lateral hypothalamic (LH) GAD2 to nucleus incertus (NI) relaxin-3 (RLN3) pathway helps balance nutrient intake and threat avoidance.
Area of Science:
- Neuroscience
- Behavioral Biology
- Physiology
Background:
- Animals must balance feeding with threat detection for survival.
- Mechanisms for suppressing fear during feeding are not well understood.
Purpose of the Study:
- To investigate the neural circuits involved in suppressing fear responses during food consumption.
- To elucidate how animals coordinate nutrient intake with threat avoidance.
Main Methods:
- Used fear-conditioned stimuli (CS) during food consumption in male mice.
- Investigated neural projections from lateral hypothalamic (LH) GAD2 neurons to nucleus incertus (NI) relaxin-3 (RLN3)-expressing neurons.
- Examined the role of the lateral mammillary nucleus (LM) in modulating fear responses.
Main Results:
- Activation of the LHGAD2-NIRLN3 neural circuit reduced CS-induced freezing behavior.
- NIRLN3 neurons projected to the LM, where RLN3 signaling decreased freezing.
- This circuit effectively modulated fear responses during feeding.
Conclusions:
- Identified a novel LHGAD2-NIRLN3-LM circuit that suppresses fear during feeding.
- This circuit plays a crucial role in coordinating feeding behavior with threat avoidance.
- Provides new insights into the neurobiological basis of survival strategies.
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