Cited by 112Neuroscience and Neuropharmacology ResearchNeuropeptides and Animal PhysiologyNeuroscience of respiration and sleep

Vasopressin Inhibits Glutamate Release via Two Distinct Modes in the Brainstem

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Bailey, T. W., Jin, Y.-H., Doyle, M. W., Smith, S. M., Andresen, M. C.·2006·Journal of Neuroscience

Abstract

The hypothalamus coordinates autonomic responses in part through arginine vasopressin (AVP) released in medial nucleus tractus solitarius (NTS). However, the mechanisms and sites of AVP action within NTS pathways are uncertain. In brainstem slices, we activated solitary tract (ST) primary afferents to release glutamate and tested whether AVP modulated synaptic transmission to second-order neurons. NTS neurons were classified as second order by ST synaptic characteristics or the presence of anterograde tracers from peripheral baroreceptor afferents. Stimulus recruitment curves indicated ST-EPSCs on individual neurons were evoked by stimulation of single ST axons. Variance-mean (V-M) analysis of ST-EPSCs in individual neurons revealed uniformly high release probability (p approximately 0.9) from an average of 19 release sites (N) and a quantal size (q) of 34.0 +/- 4.7 pA. In 26 of 49 neurons, AVP inhibited afferent synaptic transmission. In most neurons, AVP reduced ST-EPSC amplitudes (n = 20) by decreasing p to 0.65, whereas q, N, and conduction times were unaffected. The V1a antagonist SR49059 alone decreased ST-EPSC V and increased M, suggesting tonic AVP actions, and blocked exogenous AVP action (n = 4). In other neurons with identical ST release properties, AVP induced synaptic failures and increased conduction time without altering the V-M relationship of successful ST-EPSCs (n = 6). Interestingly, frequency-depressed ST-EPSCs were not affected by AVP. AVP failed to alter holding or voltage-dependent potassium currents. Thus, AVP regulates NTS neurons by two distinct novel and state-dependent mechanisms: one, an analog, graded presynaptic inhibition of terminal glutamate release and the other, a binary, extraterminal block of conducted excitation.

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Crossref · 10.1523/jneurosci.5176-05.2006

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Authors
Bailey, T. W., Jin, Y.-H., Doyle, M. W., Smith, S. M., & Andresen, M. C.
Affiliations
Oregon Health & Science University (US)
Venue
Journal of Neuroscience
Published
2006-06-07
Volume
26
Issue
23
Pages
6131-6142
ISSN
  • 0270-6474 (ISSN-L)
  • 1529-2401
OpenAlex
W1964779574
Cited by
112
References
60
Citations by year
2026: 1 · 2025: 4 · 2024: 1 · 2023: 3 · 2021: 4 · 2020: 3 · 2019: 7 · 2018: 6 · 2017: 5 · 2016: 2 · 2015: 9 · 2014: 6 · 2013: 7 · 2012: 13
FWCI
3.54
Type
journal article
Language
en
Open access
Locations
  • Journal of Neuroscience (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health
  • National Heart, Lung, and Blood Institute (F32HL070433, HL-56460, HL-70433, HL41119, R01HL041119)
  • National Institute of Neurological Disorders and Stroke (R01NS043444, NS-43444)
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuropeptides and Animal Physiology
  • Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Neuroscience of respiration and sleep
Keywords
vasopressin, glutamate release, brainstem, presynaptic inhibition, synaptic transmission, release probability, quantal size, synaptic failure, baroreceptor afferents, V1a receptor, hypothalamus, autonomic regulation
MeSH terms
Animals, Arginine Vasopressin, Drug Resistance, Male, Synaptic Transmission, Neurons, Afferent, Pressoreceptors, Probability, Rats, Sprague-Dawley, Receptors, Vasopressin, Solitary Nucleus, Glutamic Acid, Excitatory Postsynaptic Potentials, Rats, In Vitro Techniques

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