ArticleNeuropharmacology2008
5HT2 receptor activation facilitates P2X receptor mediated excitatory neurotransmission to cardiac vagal neurons in the nucleus ambiguus.
Article in Neuropharmacology, 2008. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 6 papers.
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
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Who cites it
6 citing papers in PubMed, 11 citations in OpenAlex.
- International Union of Basic and Clinical Pharmacology. CX. Classification of Receptors for 5-hydroxytryptamine; Pharmacology and Function.Pharmacological reviews · 2021Review
- Intrapulmonary arteries respond to serotonin and adenosine triphosphate in broiler chickens susceptible to idiopathic pulmonary arterial hypertension.Poultry science · 2012Article
- 5HT1A receptors inhibit glutamate inputs to cardiac vagal neurons post-hypoxia/hypercapnia.Respiratory physiology & neurobiology · 2011Article
- 5-HT2 receptors modulate excitatory neurotransmission to cardiac vagal neurons within the nucleus ambiguus evoked during and after hypoxia.Neuroscience · 2009Article
- The role of 5-HT3 and other excitatory receptors in central cardiorespiratory responses to hypoxia: implications for sudden infant death syndrome.Pediatric research · 2009Article
- Severe spontaneous bradycardia associated with respiratory disruptions in rat pups with fewer brain stem 5-HT neurons.American journal of physiology. Regulatory, integrative and comparative physiology · 2009Article
Corrections and comments
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Authors and funding
8 authors at 1 institution in 1 country.
Funding
Abstract
Parasympathetic preganglionic cardiac vagal neurons (CVNs) which dominate the control of heart rate are located within the nucleus ambiguus (NA). Serotonin (5HT), and in particular 5HT2 receptors, play an important role in cardiovascular function in the brainstem. However, there is a lack of information on the mechanisms of action of 5HT2 receptors in modulating parasympathetic cardiac activity. This study tests whether activation of 5HT2 receptors alters excitatory glutamatergic and purinergic neurotransmission to CVNs. Application of alpha-methyl-5-hydroxytryptamine (alpha-Me-5HT), a 5HT2 agonist, reversibly increased both the frequency and amplitude of miniature excitatory postsynaptic currents (mEPSCs) in CVNs. Similar responses were obtained with alpha-methyl-5-(2-thienylmethoxy)-1H-indole-3-ethanamine hydrochloride (BW723C86), and m-chlorophenylpiperazine (m-CPP), 5HT2B and 5HT2B/C receptor agonists, respectively. The facilitation evoked by alpha-Me-5HT was prevented by the 5HT2B/C receptor antagonist SB206553 hydrochloride (SB206553). Interestingly, the blockage of both NMDA and non-NMDA glutamatergic receptors did not prevent alpha-Me-5HT-evoked facilitation of mEPSCs, however, the responses were blocked by the P2 receptor antagonist pyridoxal-phosphate-6-azophenyl-2',4'-disulfonic acid (PPADS). The responses evoked by alpha-Me-5HT were mimicked by application of alpha,beta-methylene ATP (alpha,beta-Me-ATP), a P2X receptor agonist, which were also blocked by PPADS. In summary, these results indicate activation of 5HT2 receptors facilitates excitatory purinergic, but not glutamatergic, neurotransmission to CVNs.
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Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.