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    Control of sympathetic vasomotor tone by catecholaminergic C1 neurones of the rostral ventrolateral medulla oblongata

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    Author
    Marina, N; Abdala, APL; Korsak, A; Simms, AE; Allen, AM; Paton, JFR; Gourine, AV
    Date
    2011-09-01
    Source Title
    CARDIOVASCULAR RESEARCH
    Publisher
    OXFORD UNIV PRESS
    University of Melbourne Author/s
    Allen, Andrew; SIMMS, ANNABEL
    Affiliation
    Physiology
    Metadata
    Show full item record
    Document Type
    Journal Article
    Citations
    Marina, N., Abdala, A. P. L., Korsak, A., Simms, A. E., Allen, A. M., Paton, J. F. R. & Gourine, A. V. (2011). Control of sympathetic vasomotor tone by catecholaminergic C1 neurones of the rostral ventrolateral medulla oblongata. CARDIOVASCULAR RESEARCH, 91 (4), pp.703-710. https://doi.org/10.1093/cvr/cvr128.
    Access Status
    Access this item via the Open Access location
    URI
    http://hdl.handle.net/11343/31321
    DOI
    10.1093/cvr/cvr128
    Open Access at PMC
    http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3156904
    Description

    C1 - Journal Articles Refereed

    Abstract
    AIMS: Increased sympathetic tone in obstructive sleep apnoea results from recurrent episodes of systemic hypoxia and hypercapnia and might be an important contributor to the development of cardiovascular disease. In this study, we re-evaluated the role of a specific population of sympathoexcitatory catecholaminergic C1 neurones of the rostral ventrolateral medulla oblongata in the control of sympathetic vasomotor tone, arterial blood pressure, and hypercapnia-evoked sympathetic and cardiovascular responses. METHODS AND RESULTS: In anaesthetized rats in vivo and perfused rat working heart brainstem preparations in situ, C1 neurones were acutely silenced by application of the insect peptide allatostatin following cell-specific targeting with a lentiviral vector to express the inhibitory Drosophila allatostatin receptor. In anaesthetized rats with denervated peripheral chemoreceptors, acute inhibition of 50% of the C1 neuronal population resulted in ∼50% reduction in renal sympathetic nerve activity and a profound fall in arterial blood pressure (by ∼25 mmHg). However, under these conditions systemic hypercapnia still evoked vigorous sympathetic activation and the slopes of the CO(2)-evoked sympathoexcitatory and cardiovascular responses were not affected by inhibition of C1 neurones. Inhibition of C1 neurones in situ resulted in a reversible fall in perfusion pressure and the amplitude of respiratory-related bursts of thoracic sympathetic nerve activity. CONCLUSION: These data confirm a fundamental physiological role of medullary catecholaminergic C1 neurones in maintaining resting sympathetic vasomotor tone and arterial blood pressure. However, C1 neurones do not appear to mediate sympathoexcitation evoked by central actions of CO(2).
    Keywords
    Animal Physiology - Systems; Autonomic Nervous System; Expanding Knowledge in the Biological Sciences; Expanding Knowledge in the Medical and Health Sciences; Cardiovascular System and Diseases; Nervous System and Disorders

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