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Updated: Aug 4, 2025
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Optogenetic Manipulation of Neural Circuits During Monitoring Sleep/wakefulness States in Mice
Published on: June 19, 2019
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Eat, seek, rest? An orexin/hypocretin perspective.
Daria Peleg-Raibstein1, Paulius Viskaitis1, Denis Burdakov1
1ETH Zürich, Department of Health Sciences and Technology, Schorenstrasse 16, 8603 Schwerzenbach, Switzerland.
Journal of Neuroendocrinology
|March 30, 2023
Summary
Nutrient intake involves seeking and eating. Different nutrients trigger distinct brain responses, influencing whether animals seek more food or rest to digest, optimizing nutrition.
Area of Science:
- Neuroscience
- Behavioral Biology
- Nutritional Science
Background:
- Classical neuropsychology distinguishes seeking (appetitive) and ingesting (consummatory) behaviors.
- The "rest and digest" response follows calorie intake, promoting energy storage.
- The traditional seek-ingest-rest sequence may not be optimal for all nutrient types.
Purpose of the Study:
- To investigate how nutrient-specific neural responses shape post-ingestion behavioral choices.
- To explore the role of hypothalamic hypocretin/orexin neurons (HONs) in nutrient-driven behavior.
- To propose a framework for understanding nutri-neural reflexes in optimizing nutrition.
Main Methods:
- Analysis of nutrient-specific modulation of hypothalamic hypocretin/orexin neurons (HONs).
- Examination of differential neural responses to ingested macronutrients (amino acids, glucose).
- Linking nutrient-specific HON activation to distinct behavioral outcomes (seek-ingest-seek vs. seek-ingest-rest).
Main Results:
- Dietary non-essential amino acids activate HONs, promoting seeking behavior.
- Glucose intake depresses HONs, leading to rest and digest responses.
- Nutrient-specific HON modulation drives distinct behavioral sequences post-ingestion.
Conclusions:
- Hypothalamic hypocretin/orexin neurons (HONs) play a critical role in mediating nutrient-specific behavioral choices.
- Nutri-neural reflexes, driven by differential HON modulation, evolved to optimize nutrient acquisition under physiological constraints.
- This research offers a new perspective on how the brain balances seeking and resting behaviors based on ingested nutrient quality.
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