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Related Concept Videos

Sleep-Wake Cycles01:24

Sleep-Wake Cycles

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:
Narcolepsy01:07

Narcolepsy

Narcolepsy is a chronic sleep disorder characterized by pervasive, uncontrolled sleepiness and other sleep disturbances. One of its hallmark symptoms is an abrupt transition to REM sleep upon falling asleep, which causes symptoms typically associated with this phase to occur unexpectedly during wakefulness. These include the following symptoms, which typically last from a minute or two to half an hour.
Regulation of Food Intake01:30

Regulation of Food Intake

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...
Major Hormones and Their Functions01:27

Major Hormones and Their Functions

Hormones, the biochemical messengers produced by endocrine glands, are pivotal in regulating bodily functions and maintaining homeostasis. Each hormone's balance is crucial; imbalances can lead to significant physiological disruptions. Major hormones include oxytocin, cortisol, epinephrine, estrogen, testosterone, thyroxine, growth hormone, insulin, and glucagon.
Oxytocin, produced in the hypothalamus and released by the pituitary gland, plays a role in social bonding, childbirth, and lactation.
Diencephalon: Hypothalamus and Coordination01:23

Diencephalon: Hypothalamus and Coordination

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...
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Sedatives and Hypnotics Drugs: Miscellaneous Agents

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Melatonin congeners like ramelteon (Rozerem) and tasimelteon (Hetlioz) selectively bind to melatonin receptors (MT1 and MT2) and thus mimic the actions of melatonin, a hormone that regulates sleep-wake cycles. Tasimelteon is primarily used for non-24-hour sleep-wake disorder, common in blind patients. They are also used to treat conditions like insomnia...

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Related Experiment Video

Updated: Jul 7, 2026

Polygraphic Recording Procedure for Measuring Sleep in Mice
08:45

Polygraphic Recording Procedure for Measuring Sleep in Mice

Published on: January 25, 2016

[Hypocretins, peptides associated with narcolepsy].

Eric Murillo-Rodríguez1, Oscar Arias-Carrión

  • 1Departamento de Neurociencias, Instituto de Fisiología Celular, Universidad Nacional Autónoma de México, México DF, México.

Gaceta Medica De Mexico
|February 6, 2008
PubMed
Summary
This summary is machine-generated.

Narcolepsy is a neurodegenerative disease caused by the loss of hypocretin (HCRT) neurons. A new rat model using hypocretin2/saporine toxin aids in studying narcolepsy and potential transplant therapies.

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Area of Science:

  • Neuroscience
  • Pathology

Context:

  • Narcolepsy is a chronic neurological disorder characterized by excessive daytime sleepiness and disrupted sleep patterns.
  • Human narcolepsy is linked to the loss of hypocretin (HCRT) neurons in the lateral hypothalamus, with reduced HCRT levels in cerebrospinal fluid.

Purpose:

  • To review the current understanding of narcolepsy, focusing on the hypocretinergic system.
  • To introduce a novel experimental rat model for studying narcolepsy.
  • To explore the potential of transplants as a therapeutic strategy.

Summary:

  • Experimental evidence indicates narcolepsy is a neurodegenerative condition resulting from hypocretin (HCRT) neuron loss.
  • A new rat model utilizing hypocretin2/saporine (HCRT2/SAP) toxin selectively destroys HCRT neurons, mimicking narcolepsy's behavioral profile.
  • This model facilitates histological and neurochemical studies of narcolepsy.

Impact:

  • Provides insights into the neurobiology of narcolepsy.
  • Offers a valuable tool for narcolepsy research.
  • Highlights the potential of cell transplantation as a future therapeutic approach for narcolepsy.