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• W1548002034 abstract "Stimulation of cardiac sympathetic afferents increases sympathetic outflow and blood pressure. Chemicals released during myocardial ischaemia activate cardiac afferents. This study was to determine the responses of neurons in paraventricular nucleus (PVN) to the cardiac afferent activation caused by exogenous chemicals or myocardial ischaemia using an extracellular single-unit recording method. Rats were anaesthetized and underwent bilateral cervical vagal denervation (VD) and carotid and aortic baroreceptor denervation (BD). In 196 spontaneously active neurons in parvicellular PVN, 60 (30.6%), 36 (18.4%) and 91 (46.4%) neurons were respectively sensitive, mildly sensitive and insensitive to capsaicin, while nine (4.6%) neurons showed inhibitory responses to capsaicin. Epicardial application of capsaicin activated capsaicin-sensitive neurons in the PVN and increased mean arterial pressure. These neurons were also sensitive to exogenous bradykinin, adenosine and H2O2. The neuron response is not secondary to a capsaicin-induced increase in mean arterial pressure because a similar degree of pressor response induced by aortic coarctation did not increase the neuron activity. Compared with intact rats, VD or BD or combined VD and BD increased the response of capsaicin-sensitive neurons to epicardial application of capsaicin, while stimulation of vagal afferents inhibited the response. Myocardial ischaemia caused increases in the activity of capsaicin-sensitive neurons and renal sympathetic nerve activity. The results indicate that chemical stimulation of cardiac sympathetic afferents activates capsaicin-sensitive neurons in parvicellular PVN, which is inhibited by the afferent activities of vagi and arterial baroreceptors. Acute myocardial ischaemia activates capsaicin-sensitive neurons in PVN and enhances sympathetic outflow." @default.
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• W1548002034 date "2011-02-01" @default.
• W1548002034 modified "2023-09-27" @default.
• W1548002034 title "Responses of neurons in paraventricular nucleus to activation of cardiac afferents and acute myocardial ischaemia in rats" @default.
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• W1548002034 doi "https://doi.org/10.1113/expphysiol.2010.055475" @default.
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