Related Experiment Video
Updated: Dec 27, 2025
09:29
Author Spotlight: Hypothalamic Neural Mechanism Insights
Published on: August 4, 2023
4.5K
The hypocretin (orexin) system: from a neural circuitry perspective
1Department of Psychiatry and Behavioral Sciences, Stanford University School of Medicine, 1201 Welch Road, Stanford, CA, 94305, USA.
Neuropharmacology
|March 6, 2020
Summary
Hypocretin/orexin neurons in the hypothalamus regulate key functions like sleep and mood. Advanced techniques reveal their complex neural pathways and potential for pharmaceutical targeting.
Area of Science:
- Neuroscience
- Molecular Biology
- Endocrinology
Background:
- Hypocretin/orexin (HCRT) neurons, located in the hypothalamus, are crucial for regulating sleep, reward, appetite, and mood.
- Over two decades of research confirm the HCRT system's vital role in neural modulation.
- Recent advancements enable detailed mapping of HCRT neuron connectivity.
Purpose of the Study:
- To review the functional pathways originating from HCRT neurons to their target brain regions.
- To discuss the anatomical and functional inputs to HCRT neurons.
- To summarize the development of pharmaceutical compounds targeting HCRT signaling.
Main Methods:
- Viral-mediated tracing systems for mapping monosynaptic inputs.
- Optogenetics, fiber-photometry, and cell-type specific manipulation for functional analysis.
- Single-cell RNA sequencing for detailed molecular characterization.
Main Results:
- Elucidation of HCRT neuron connectivity and functional modulation of behaviors.
- Identification of key neural pathways influenced by HCRT signaling.
- Insights into the neurobiological underpinnings of HCRT-regulated functions.
Conclusions:
- The HCRT system plays a central role in integrating diverse physiological and behavioral processes.
- Advanced research techniques are progressively revealing the intricate mechanisms of HCRT neuron function.
- Targeting HCRT signaling holds therapeutic potential for various neurological and psychiatric disorders.
Related Concept Videos
01:24Sleep-Wake Cycles
2.6K
Sleep is an essential physiological process vital to maintaining overall well-being. The reticular activating system (RAS), a network of neurons in the brainstem, regulates wakefulness and sleep. While it may seem passive, sleep consists of distinct cycles, each with its unique characteristics and functions. Two key sleep phases are non-rapid eye movement (NREM) and rapid eye movement (REM).
NREM Sleep
NREM sleep comprises four progressive stages that seamlessly merge:
NREM Sleep
NREM sleep comprises four progressive stages that seamlessly merge:
2.6K
01:30Diencephalon: Anatomical Regions
4.4K
The diencephalon, etymologically translated as 'through brain,' plays an integral role as the conduit between the cerebrum and the vast extent of the nervous system. However, the olfactory system is an exception, as it interfaces directly with the cerebrum. The diencephalon, deeply ensconced beneath the cerebrum, primarily consists of three paired structures — the thalamus, hypothalamus, and epithelamus. It also includes accessory structures such as the subthalamus, which houses the...
4.4K
01:23Diencephalon: Hypothalamus and Coordination
3.3K
The hypothalamus is a small yet highly complex and essential brain region that plays a crucial role in regulating various bodily functions. Anatomically, it is located at the base of the brain, just above the brainstem and below the thalamus, forming part of the limbic system.
The hypothalamus interacts with other brain regions, including the pituitary gland, through a direct physical connection called the hypothalamic-pituitary axis. The hypothalamus receives somatic and visceral inputs and...
The hypothalamus interacts with other brain regions, including the pituitary gland, through a direct physical connection called the hypothalamic-pituitary axis. The hypothalamus receives somatic and visceral inputs and...
3.3K
01:25Olfaction
47.9K
The sense of smell is achieved through the activities of the olfactory system. It starts when an airborne odorant enters the nasal cavity and reaches olfactory epithelium (OE). The OE is protected by a thin layer of mucus, which also serves the purpose of dissolving more complex compounds into simpler chemical odorants. The size of the OE and the density of sensory neurons varies among species; in humans, the OE is only about 9-10 cm2.
The olfactory receptors are embedded in the cilia of the...
The olfactory receptors are embedded in the cilia of the...
47.9K
01:20Physiology of Smell and Olfactory Pathway
11.9K
Humans detect odors with the help of specialized cells located in the upper part of the nasal cavity, called olfactory receptor neurons (ORNs). ORNs possess hair-like structures called cilia, which are receptive to sensations from the inhaled air. When an odorant molecule binds to a specific receptor on the cell of the cilia, it leads to a series of events that ultimately cause the ORN to send electrical signals to the olfactory bulb in the brain through the olfactory nerves.
The olfactory...
The olfactory...
11.9K
01:30Regulation of Food Intake
2.2K
Short-term regulation of food intake primarily involves neural signals from the gastrointestinal (GI) tract, blood nutrient levels, and GI tract hormones. Communication between the gut and brain via vagal nerve fibers plays a significant role in evaluating the contents of the gut. Clinical studies have shown that protein ingestion produces a more prolonged response in these nerve fibers compared to an equivalent amount of glucose. Additionally, the activation of stretch receptors caused by GI...
2.2K