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Optogenetic Manipulation of Neural Circuits During Monitoring Sleep/wakefulness States in Mice
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Activated Wake Systems in Narcolepsy Type 1.

Ling Shan1,2, Suzan Linssen2, Zoe Harteman2

  • 1Leiden University Medical Centre, Department of Neurology, Leiden, The Netherlands, and Sleep Wake Centre SEIN, Heemstede, The Netherlands.

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|July 3, 2023
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Summary
This summary is machine-generated.

Narcolepsy type 1 involves more than just hypocretin deficiency. Research shows increased activity in corticotropin-releasing hormone (CRH) and histamine neurons, suggesting complex neurochemical changes in this sleep disorder.

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Area of Science:

  • Neuroscience
  • Endocrinology
  • Sleep Medicine

Background:

  • Narcolepsy type 1 (NT1) is primarily linked to hypocretin (orexin) deficiency.
  • Recent findings indicate potential involvement of other neurotransmitter systems.

Purpose of the Study:

  • To investigate the expression and co-expression of corticotropin-releasing hormone (CRH) and vasopressin (AVP) in the paraventricular nucleus (PVN) in NT1.
  • To assess the activity of other wake-promoting systems, including histamine, dopamine, and norepinephrine pathways, in NT1.

Main Methods:

  • Postmortem brain tissue from individuals with NT1 and controls was used.
  • Immunohistochemistry was employed to quantify specific neuronal populations: CRH and AVP in the PVN, CRH in the Barrington nucleus, histidine decarboxylase (HDC) in the hypothalamic tuberomammillary nucleus (TMN), and tyrosine hydroxylase (TH) in the midbrain and locus coeruleus (LC).

Main Results:

  • A significant increase (234%) in the percentage of CRH cells co-expressing AVP was observed in the PVN in NT1.
  • There was a 36% increase in histamine neurons expressing HDC in the TMN.
  • A trend towards increased TH-positive dopamine neurons was noted in the substantia nigra, while norepinephrine neurons in the LC remained unchanged.

Conclusions:

  • Findings suggest an upregulation of activity in histamine neurons and remaining CRH neurons in NT1.
  • This may explain altered cortisol responses observed in NT1 patients.
  • CRH neurons co-expressing AVP might be less vulnerable in NT1 pathogenesis.