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Vascular control of the CO2/H+ dependent drive to breathe

  1. Colin M Cleary
  2. Thiago S Moreira
  3. Ana C Takakura
  4. Mark T Nelson
  5. Thomas A Longden
  6. Daniel K Mulkey  Is a corresponding author
  1. University of Connecticut, United States
  2. University of São Paulo, Brazil
  3. University of Vermont, United States
  4. University of Maryland, United States
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Cite this article as: eLife 2020;9:e59499 doi: 10.7554/eLife.59499

Abstract

Respiratory chemoreceptors regulate breathing in response to changes in tissue CO2/H+. Blood flow is a fundamental determinant of tissue CO2/H+, yet little is known regarding how regulation of vascular tone in chemoreceptor regions contributes to respiratory behavior. Previously, we showed in rat that CO2/H+-vasoconstriction in the retrotrapezoid nucleus (RTN) supports chemoreception by a purinergic-dependent mechanism (Hawkins et al. 2017). Here, we show in mice that CO2/H+ dilates arterioles in other chemoreceptor regions, thus demonstrating CO2/H+ vascular reactivity in the RTN is unique. We also identify P2Y2 receptors in RTN smooth muscle cells as the substrate responsible for this response. Specifically, pharmacological blockade or genetic deletion of P2Y2 from smooth muscle cells blunted the ventilatory response to CO2, and re-expression of P2Y2 receptors only in RTN smooth muscle cells fully rescued the CO2/H+ chemoreflex. These results identify P2Y2 receptors in RTN smooth muscle cells as requisite determinants of respiratory chemoreception.

Article and author information

Author details

  1. Colin M Cleary

    Department of Physiology and Neurobiology, University of Connecticut, Storrs, United States
    Competing interests
    No competing interests declared.
    ORCID icon "This ORCID iD identifies the author of this article:" 0000-0003-0305-1324
  2. Thiago S Moreira

    Department of Physiology and Biophysics, University of São Paulo, São Paulo, Brazil
    Competing interests
    No competing interests declared.
    ORCID icon "This ORCID iD identifies the author of this article:" 0000-0002-9789-8296
  3. Ana C Takakura

    Department of Pharmacology, University of São Paulo, São Paulo, Brazil
    Competing interests
    No competing interests declared.
  4. Mark T Nelson

    Department of Pharmacology, University of Vermont, Burlington, United States
    Competing interests
    Mark T Nelson, Reviewing editor, eLife.
    ORCID icon "This ORCID iD identifies the author of this article:" 0000-0002-6608-8784
  5. Thomas A Longden

    Department of Physiology, University of Maryland, Baltimore, United States
    Competing interests
    No competing interests declared.
  6. Daniel K Mulkey

    Department of Physiology and Neurobiology, University of Connecticut, Storrs, United States
    For correspondence
    daniel.mulkey@uconn.edu
    Competing interests
    No competing interests declared.
    ORCID icon "This ORCID iD identifies the author of this article:" 0000-0002-7040-3927

Funding

National Institutes of Health (HL104101)

  • Daniel K Mulkey

Sao Paulo Research Foundation (2015/23376-1)

  • Thiago S Moreira

Conselho Nacional de Desenvolvimento Científico e Tecnológico (408647/2018-3)

  • Ana C Takakura

Conselho Nacional de Desenvolvimento Científico e Tecnológico (301219/2016-8)

  • Ana C Takakura

Conselho Nacional de Desenvolvimento Científico e Tecnológico (301904/2015-4)

  • Thiago S Moreira

Fondation Leducq

  • Mark T Nelson

European Union Horizon 2020 Research and Innovation Programme

  • Mark T Nelson

Henry M. Jackson Foundation (HU0001-18-2-001)

  • Mark T Nelson

National Institutes of Health (HL137094)

  • Daniel K Mulkey

National Institutes of Health (NS099887)

  • Daniel K Mulkey

National Institutes of Health (NS110656)

  • Mark T Nelson

National Institutes of Health (HL140027)

  • Mark T Nelson

National Institutes of Health (HL142227)

  • Colin M Cleary

American Heart Association (17SDG33670237)

  • Thomas A Longden

American Heart Association (19IPLOI34660108)

  • Thomas A Longden

Sao Paulo Research Foundation (2016/23281-3)

  • Ana C Takakura

The funders had no role in study design, data collection and interpretation, or the decision to submit the work for publication.

Ethics

Animal experimentation: All procedures were performed in accordance with National Institutes of Health and University of Connecticut Animal Care and Use Guidelines as described in protocols A19-048 and A20-016.

Reviewing Editor

  1. Jeffrey C Smith, National Institute of Neurological Disorders and Stroke, United States

Publication history

  1. Received: May 29, 2020
  2. Accepted: September 14, 2020
  3. Accepted Manuscript published: September 14, 2020 (version 1)
  4. Accepted Manuscript updated: September 16, 2020 (version 2)

Copyright

© 2020, Cleary et al.

This article is distributed under the terms of the Creative Commons Attribution License permitting unrestricted use and redistribution provided that the original author and source are credited.

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