Metabotropic neurotransmission and integration of sympathetic nerve activity by the rostral ventrolateral medulla in the rat

Paul M. Pilowsky*, Stephen B. Abbott, Peter G.R. Burke, Melissa M.J. Farnham, Cara M. Hildreth, Natasha N. Kumar, Qun Li, Tina Lonergan, Simon McMullan, Darko Spirovski, Ann K. Goodchild

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    20 Citations (Scopus)


    1. Cardiovascular sympathetic nerve activity at rest is grouped into waves, or bursts, that are generally, although not exclusively, related to the heart rate and to respiration. In addition, activity is also generated in response to central commands and to environmental stimuli. 2. Responsibility for the integration of all these different elements of sympathetic activity rests with pre-motoneurons in the rostral ventrolateral medulla oblongata. These pre-motoneurons are glutamatergic and spinally projecting where they form synapses with sympathetic preganglionic neurons. 3. Pre-motoneurons also contain and presumably release, neurotransmitters other than glutamate, including amines and neuropeptides that act on metabotropic receptors with long-term effects on cell function. 4. Similarly, in the rostral ventrolateral medulla oblongata the pre-motoneurons are mainly regulated by excitatory influences from glutamate and inhibitory influences from γ-aminobutyric acid (GABA). Major focuses of recent studies are the interactions between non-glutamatergic and GABAergic systems and reflexes that regulate the activity of the sympathetic nervous system. 5. The results indicate that neurotransmitters acting at metabotropic receptors selectively affect different reflexes in the rostral ventrolateral medulla. It is suggested that this differential activation or attenuation of reflexes by different neurotransmitters is a mechanism by which the organism can fine-tune its responses to different homeostatic requirements.

    Original languageEnglish
    Pages (from-to)508-511
    Number of pages4
    JournalClinical and Experimental Pharmacology and Physiology
    Issue number4
    Publication statusPublished - Apr 2008


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