Key result
5-HT stimulates cardiac noradrenaline release in dogs, mediating its cardiac stimulatory effects.
Why the study?
The hypothesis that the cardiac stimulatory effects of 5-hydroxytryptamine are mediated by catecholamines required experimental validation.
This preclinical study demonstrates that the cardiac stimulatory effects of 5-HT are mediated by the release of noradrenaline from sympathetic nerve endings.
Answers are grounded in this paper and cite their sources.
No immediate clinical implications; leaves open translation of 5-HT-noradrenaline interactions to human cardiac physiology.
The following experiments have been carried out in order to establish the validity of the hypothesis that the cardiac stimulatory effects of 5‐hydroxytryptamine (5‐HT) are mediated by catecholamines. Release of cardiac noradrenaline (NA) has been observed after administration of 5‐HT either intravenously or intracoronarily. After labelling the heart with3H‐5‐HT, it was possible to release this amine by cardioaccelerator nerve stimulation even after treatment with an adrenergic β blocker. It is concluded that the cardiac stimulatory effects of 5‐HT are mediated by NA; this NA is mainly derived from sympathetic nerve endings by intra‐neuronal exchange for 5‐HT.
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Pillion et al. (1971) studied this question. 5-hydroxytryptamine (5-HT) was evaluated on Release of cardiac noradrenaline (NA). Administration of 5-hydroxytryptamine (5-HT) in dogs stimulated the release of cardiac noradrenaline, mediating its cardiac stimulatory effects.
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