Cited by 89Heart Rate Variability and Autonomic ControlVagus Nerve Stimulation ResearchNeuroscience and Neuropharmacology Research

Optogenetic stimulation of locus ceruleus neurons augments inhibitory transmission to parasympathetic cardiac vagal neurons via activation of brainstem α1 and β1 receptors

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Wang, Xin, Piñol, Ramón A., Byrne, Peter, Mendelowitz, David·2014·The Journal of Neuroscience

Abstract

Locus ceruleus (LC) noradrenergic neurons are critical in generating alertness. In addition to inducing cortical arousal, the LC also orchestrates changes in accompanying autonomic system function that compliments increased attention, such as during stress, excitation, and/or exposure to averse or novel stimuli. Although the association between arousal and increased heart rate is well accepted, the neurobiological link between the LC and parasympathetic neurons that control heart rate has not been identified. In this study, we test directly whether activation of noradrenergic neurons in the LC influences brainstem parasympathetic cardiac vagal neurons (CVNs). CVNs were identified in transgenic mice that express channel-rhodopsin-2 (ChR2) in LC tyrosine hydroxylase neurons. Photoactivation evoked a rapid depolarization, increased firing, and excitatory inward currents in ChR2-expressing neurons in the LC. Photostimulation of LC neurons did not alter excitatory currents, but increased inhibitory neurotransmission to CVNs. Optogenetic activation of LC neurons increased the frequency of isolated glycinergic IPSCs by 27 ± 8% (p = 0.003, n = 26) and augmented GABAergic IPSCs in CVNs by 21 ± 5% (p = 0.001, n = 26). Inhibiting α1, but not α2, receptors blocked the evoked responses. Inhibiting β1 receptors prevented the increase in glycinergic, but not GABAergic, IPSCs in CVNs. This study demonstrates LC noradrenergic neurons inhibit the brainstem CVNs that generate parasympathetic activity to the heart. This inhibition of CVNs would increase heart rate and risks associated with tachycardia. The receptors activated within this pathway, α1 and/or β1 receptors, are targets for clinically prescribed antagonists that promote slower, cardioprotective heart rates during heightened vigilant states.

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Crossref · 10.1523/jneurosci.5093-13.2014

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Authors
Wang, X., Piñol, R. A., Byrne, P., & Mendelowitz, D.
Affiliations
George Washington University (US)
Venue
The Journal of Neuroscience
Published
2014-04-30
Volume
34
Issue
18
Pages
6182-6189
ISSN
  • 0270-6474 (ISSN-L)
  • 1529-2401
OpenAlex
W2026113561
Cited by
89
References
52
Citations by year
2026: 7 · 2025: 9 · 2024: 7 · 2023: 2 · 2022: 11 · 2021: 6 · 2020: 6 · 2019: 10 · 2018: 7 · 2017: 8 · 2016: 9 · 2015: 5 · 2014: 2
FWCI
5.50
Type
journal article
Language
en
Open access
Locations
  • Journal of Neuroscience (publishedVersion, cc-by-nc-sa)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health (HL 59895, HL49965)
  • National Heart, Lung, and Blood Institute (HL 49965, R01HL072006, HL72006, R01HL049965, R01HL059895, HL59895)
Topics
  • Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Heart Rate Variability and Autonomic Control
  • Life Sciences › Neuroscience › Neurology › Vagus Nerve Stimulation Research
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
Keywords
locus coeruleus, noradrenergic neurons, inhibitory neurotransmission, alpha1-adrenoceptors, beta1-adrenergic receptor, autonomic regulation of heart rate, tachycardia
MeSH terms
Channelrhodopsins, Afferent Pathways, Animals, Bacterial Proteins, Brain Stem, Glycine, Heart, Locus Coeruleus, Luminescent Proteins, Mice, Transgenic, Neurons, Photic Stimulation, Tyrosine 3-Monooxygenase, Vagus Nerve, Receptors, Adrenergic, alpha-1, Receptors, Adrenergic, beta-1, Patch-Clamp Techniques, Adrenergic Agents, Mice, Inhibitory Postsynaptic Potentials, Optogenetics

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