Cited by 70Sleep and Wakefulness ResearchCircadian rhythm and melatoninNeurotransmitter Receptor Influence on Behavior

Reassessing the Role of Histaminergic Tuberomammillary Neurons in Arousal Control

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Venner, Anne, Mochizuki, Takatoshi, De Luca, Roberto, Anaclet, Christelle, Scammell, Thomas E., Saper, Clifford B., Arrigoni, Elda, Fuller, Patrick M.·2019·The Journal of Neuroscience

Abstract

The histaminergic neurons of the tuberomammillary nucleus (TMN HDC ) of the posterior hypothalamus have long been implicated in promoting arousal. More recently, a role for GABAergic signaling by the TMN HDC neurons in arousal control has been proposed. Here, we investigated the effects of selective chronic disruption of GABA synthesis (via genetic deletion of the GABA synthesis enzyme, glutamic acid decarboxylase 67) or GABAergic transmission (via genetic deletion of the vesicular GABA transporter (VGAT)) in the TMN HDC neurons on sleep–wake in male mice. We also examined the effects of acute chemogenetic activation and optogenetic inhibition of TMN HDC neurons upon arousal in male mice. Unexpectedly, we found that neither disruption of GABA synthesis nor GABAergic transmission altered hourly sleep–wake quantities, perhaps because very few TMN HDC neurons coexpressed VGAT. Acute chemogenetic activation of TMN HDC neurons did not increase arousal levels above baseline but did enhance vigilance when the mice were exposed to a behavioral cage change challenge. Similarly, acute optogenetic inhibition had little effect upon baseline levels of arousal. In conclusion, we could not identify a role for GABA release by TMN HDC neurons in arousal control. Further, if TMN HDC neurons do release GABA, the mechanism by which they do so remains unclear. Our findings support the view that TMN HDC neurons may be important for enhancing arousal under certain conditions, such as exposure to a novel environment, but play only a minor role in behavioral and EEG arousal under baseline conditions. SIGNIFICANCE STATEMENT The histaminergic neurons of the tuberomammillary nucleus of the hypothalamus (TMN HDC ) have long been thought to promote arousal. Additionally, TMN HDC neurons may counter-regulate the wake-promoting effects of histamine through co-release of the inhibitory neurotransmitter, GABA. Here, we show that impairing GABA signaling from TMN HDC neurons does not impact sleep–wake amounts and that few TMN HDC neurons contain the vesicular GABA transporter, which is presumably required to release GABA. We further show that acute activation or inhibition of TMN HDC neurons has limited effects upon baseline arousal levels and that activation enhances vigilance during a behavioral challenge. Counter to general belief, our findings support the view that TMN HDC neurons are neither necessary nor sufficient for the initiation and maintenance of arousal under baseline conditions.

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Authors
Venner, A., Mochizuki, T., De Luca, R., Anaclet, C., Scammell, T. E., Saper, C. B., Arrigoni, E., & Fuller, P. M.
Affiliations
  • Beth Israel Deaconess Medical Center (US)
  • University of Toyama (JP)
  • University of Massachusetts Chan Medical School (US)
Venue
The Journal of Neuroscience
Published
2019-09-23
Volume
39
Issue
45
Pages
8929-8939
ISSN
  • 0270-6474 (ISSN-L)
  • 1529-2401
OpenAlex
W2976060716
Cited by
70
References
44
Citations by year
2026: 6 · 2025: 1 · 2024: 28 · 2023: 4 · 2022: 8 · 2021: 15 · 2020: 7 · 2019: 1
FWCI
4.50
Type
journal article
Language
en
Open access
Locations
  • Journal of Neuroscience (publishedVersion, cc-by-nc-sa)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • The Journal of the American Medical Association (JAMA) Network (American Medical Association) (submittedVersion, cc-by)
  • eScholarship (California Digital Library) (submittedVersion, cc-by-nc-sa)
Funders
  • National Heart, Lung, and Blood Institute (P01HL095491)
  • National Institute of Neurological Disorders and Stroke (R01NS092652, R01NS085477, R01NS103161, R01NS073613)
Topics
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Sleep and Wakefulness Research
  • Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Circadian rhythm and melatonin
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neurotransmitter Receptor Influence on Behavior
Keywords
tuberomammillary nucleus, histaminergic neurons, arousal control, GABAergic neurotransmission, vesicular GABA transporter, glutamic acid decarboxylase 67, sleep-wake regulation, sustained attention, chemogenetic activation, optogenetic inhibition
MeSH terms
Action Potentials, Animals, Arousal, gamma-Aminobutyric Acid, Glutamate Decarboxylase, Histamine, Hypothalamic Area, Lateral, Male, Mice, Inbred C57BL, Neurons, Sleep, Vesicular Inhibitory Amino Acid Transport Proteins, Mice

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