PUBLICATION
Zebrafish heart as a model to study the integrative autonomic control of pacemaker function
- Authors
- Stoyek, M.R., Quinn, T.A., Croll, R.P., Smith, F.M.
- ID
- ZDB-PUB-160628-15
- Date
- 2016
- Source
- American journal of physiology. Heart and circulatory physiology 311(3): H676-88 (Journal)
- Registered Authors
- Croll, Roger P., Stoyek, Matthew
- Keywords
- atrioventricular pacemaker, intracardiac nervous system, parasympathetic, sinoatrial pacemaker, sympathetic
- MeSH Terms
-
- Receptors, Adrenergic, beta-2/metabolism
- Autonomic Nervous System/drug effects
- Autonomic Nervous System/physiology
- Bradycardia/physiopathology
- Muscarinic Antagonists/pharmacology
- Animals
- Atrioventricular Node/drug effects
- Atrioventricular Node/innervation*
- Atrioventricular Node/physiology
- Atrioventricular Node/physiopathology
- Adrenergic beta-Antagonists/pharmacology
- Sinoatrial Node/drug effects
- Sinoatrial Node/innervation*
- Sinoatrial Node/physiology
- Sinoatrial Node/physiopathology
- Muscarine/pharmacology
- Nicotinic Agonists/pharmacology
- Muscarinic Agonists/pharmacology
- Parasympathetic Nervous System/drug effects
- Parasympathetic Nervous System/physiology*
- Sympathetic Nervous System/drug effects
- Sympathetic Nervous System/physiology*
- Heart/drug effects
- Heart/innervation*
- Heart/physiology
- Heart/physiopathology
- Timolol/pharmacology
- Tachycardia/physiopathology
- Receptor, Muscarinic M2/metabolism
- Isolated Heart Preparation
- Sympathomimetics/pharmacology
- Nicotinic Antagonists/pharmacology
- Hexamethonium/pharmacology
- Models, Animal
- Heart Rate
- Nicotine/pharmacology
- Zebrafish
- Isoproterenol/pharmacology
- Atropine/pharmacology
- Electrocardiography
- Vagus Nerve Stimulation
- PubMed
- 27342878 Full text @ Am. J. Physiol. Heart Circ. Physiol.
Citation
Stoyek, M.R., Quinn, T.A., Croll, R.P., Smith, F.M. (2016) Zebrafish heart as a model to study the integrative autonomic control of pacemaker function. American journal of physiology. Heart and circulatory physiology. 311(3):H676-88.
Abstract
The cardiac pacemaker sets the heart's primary rate, with pacemaker discharge controlled by the autonomic nervous system through intracardiac ganglia. A fundamental issue in understanding the relationship between neural activity and cardiac chronotropy is the identification of neuronal populations that control pacemaker cells. To date most studies of neurocardiac control have been done in mammalian species, where neurons are embedded in and distributed throughout the heart, so are largely inaccessible for whole-heart, integrative studies. Here, we establish the isolated, innervated zebrafish heart as a novel alternative model for studies of autonomic control of heart rate. Stimulation of individual cardiac vagosympathetic nerve trunks evoked bradycardia (parasympathetic activation) and tachycardia (sympathetic activation). Simultaneous stimulation of both vagosympathetic nerve trunks evoked a summative bradycardic effect. Effects of nerve stimulation were mimicked by direct application of cholinergic and adrenergic agents. Optical mapping of electrical activity confirmed the sinoatrial region as the site of origin of normal pacemaker activity, and identified a secondary pacemaker in the atrioventricular region. Strong vagosympathetic nerve stimulation resulted in a shift in the origin of initial excitation from the sinoatrial pacemaker to the atrioventricular pacemaker. Putative pacemaker cells in the sinoatrial and atrioventricular regions expressed adrenergic β2 and cholinergic muscarinic type 2 receptors. Collectively, we have demonstrated that the zebrafish heart contains the accepted hallmarks of cardiac control, establishing this preparation as a viable model for studies of integrative physiological control of cardiac function by intracardiac neurons.
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Fish
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