Abstract:
:1. In order to explore whether 5-HT4 receptor subtypes exist, we have characterized further the 5-HT4 receptor that mediates tachycardia in the piglet isolated right atrium. All experiments were carried out in the presence of propranolol (400 nM) and cocaine (6 microM). We used tryptamine derivatives, substituted benzamides and benzimidazolone derivatives as pharmacological tools. 2. Tachycardia responses to 5-hydroxytryptamine (5-HT) were mimicked by other tryptamine derivatives with the following order of potency: 5-HT > 5-methoxytryptamine alpha-methyl-5-HT = bufotenine bufotenine > 5-carboxamidotryptamine = tryptamine (after treatment with pargyline) > 5-methoxy-N,N-dimethyltryptamine > 2-methyl-5-HT. 3. The substituted benzamides were all partial agonists relative to 5-HT except (-)-zacopride which was a full agonist. The stimulant potency order was renzapride > cisapride = (-)-zacopride > metoclopramide > (+)-zacopride. 4. The benzimidazolone derivatives had contrasting effects. BIMU 8 (endo-N-(8-methyl-8-azabicyclo[3.2.1]oct-3-yl)-2,3-dihydro-(1-methyl(eth yl- 2-oxo-1H-benzimidazole-1-carboxamide hydrochloride) was a full agonist relative to 5-HT whilst BIMU 1 (endo-N-(8-methyl-8-azabicyclo[3.2.1]oct-3-yl)-2,3-dihydro-3-ethyl-2-oxo - 1H-benzimidazole-1-carboxamide hydrochloride) was a partial agonist with low intrinsic activity compared to 5-HT but had similar potency. We estimated a pKB of 7.9 for BIMU 1 antagonism of 5-HT-induced tachycardia. DAU 6215 (N-endo-8-methyl-8-azabicyclo[3.2.1]-oct-3-yl)-2,3-dihydro-2-oxo-lH-benzimidazole-l-carboxamide, hydrochloride) had no chronotropic activity and was found to be a simple competitive antagonist with a pKB of 7.15.SB 203186 (1-piperidinyl)ethyl lH-indole 3-carboxylate) was a potent antagonist with a pKB of 8.3.The affinity of SB 203186 was approximately 20 times higher than that of tropisetron (ICS 205-930;pKB= 6.9) and DAU 6215 (pKB= 7.0). GR1 13808 (([1-[2-[methylsulphonyl amino]ethyl]-4-piperidinyl]methyl 1-methyl-1H-indole-3-carboxylate) and SDZ 205-557 ((2-diethylaminoethyl)2-methoxy-4-amino-5-chloro-benzoate) also antagonized 5-HT-induced tachycardia but not by simple competitive blockade.6. The sinoatrial 5-HT4 receptor in the piglet has a pharmacological profile that correlates well with 5-HT4 receptors characterized in rat oesophagus, guinea-pig ileum and colon, mouse embryonic colliculi neurones and human atrium.
journal_name
Br J Pharmacoljournal_title
British journal of pharmacologyauthors
Medhurst AD,Kaumann AJdoi
10.1111/j.1476-5381.1993.tb13916.xsubject
Has Abstractpub_date
1993-11-01 00:00:00pages
1023-30issue
3eissn
0007-1188issn
1476-5381journal_volume
110pub_type
杂志文章abstract::The effect of adenosine on transepithelial ion transport was investigated in isolated preparations of murine trachea mounted in Ussing chambers. The possible regulation of adenosine receptors in an established model of allergic airway inflammation was also investigated. Mucosally applied adenosine caused increases in ...
journal_title:British journal of pharmacology
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abstract::1 The influence of dopamine receptor agonists on gastric acid secretion stimulated by thyrotropin-releasing hormone (TRH) was studied in the perfused stomach of anaesthetized rats. 2 Intraventricular TRH produced a dose-dependent stimulation of basal gastric acid secretion. 3 Pretreatment with apomorphine, bromocripti...
journal_title:British journal of pharmacology
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abstract::Pulmonary hypertension (PH) is defined by elevated mean pulmonary artery pressure following the pathological remodelling of small pulmonary arteries. An increase in right ventricular (RV) afterload results in RV hypertrophy and RV failure. The pathophysiology of PH, and RV remodelling in particular, is not well unders...
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abstract::1 In order to address mechanistic differences between arterial vessel types, we have compared the vasorelaxant actions of anandamide in resistance (G3) and conduit (G0) mesenteric arteries. 2 Anandamide produced concentration-dependent relaxations of pre-constricted G3 arteries with a maximal response that was signifi...
journal_title:British journal of pharmacology
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abstract:BACKGROUND AND PURPOSE:Voltage-operated sodium channels constitute major target sites for local anaesthetic-like action. The clinical use of local anaesthetics is still limited by severe side effects, in particular, arrhythmias and convulsions. These side effects render the search for new local anaesthetics a matter of...
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journal_title:British journal of pharmacology
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doi:10.1111/j.1476-5381.1986.tb10186.x
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journal_title:British journal of pharmacology
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abstract:BACKGROUND AND PURPOSE:Antiretroviral (ARV) drugs activate pregnane X receptors and constitutive androstane receptors, increasing the risk of drug interactions due to altered drug metabolism and disposition. The closely related liver X receptors (LXRα/β), oestrogen receptors (ERα/β) and glucocorticoid receptor (GR) reg...
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journal_title:British journal of pharmacology
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abstract::Biological nitrogen oxide signalling and stress is an area of extreme clinical, pharmacological, toxicological, biochemical and chemical research interest. The utility of nitric oxide and derived species as signalling agents is due to their novel and vast chemical interactions with a variety of biological targets. Her...
journal_title:British journal of pharmacology
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journal_title:British journal of pharmacology
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doi:10.1111/j.1476-5381.1969.tb08290.x
更新日期:1969-03-01 00:00:00
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abstract::1. In isolated detrusor strips from the guinea-pig urinary bladder, contractile responses to electrical field stimulation were mostly mediated by neurally released acetylcholine (ACh) and adenosine 5'-triphosphate (ATP). 2. 5-Hydroxytryptamine (5-HT) produced a concentration-dependent increase in the amplitude of stim...
journal_title:British journal of pharmacology
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更新日期:1995-06-01 00:00:00
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journal_title:British journal of pharmacology
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abstract::1 The actions of 5-methoxytryptamine (5-MeOT), N,N-dimethyltryptamine (DMT), 5-hydroxy-N,N-dimethyltryptamine (bufotenine, 5-HODMT) and 5-methoxy-N,N-dimethyltryptamine (5-MeODMT), and their interactions with 5-hydroxytryptamine (5-HT), acetylcholine, (-)-noradrenaline, and glutamate were studied by microiontophoresis...
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更新日期:2018-10-01 00:00:00
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journal_title:British journal of pharmacology
pub_type: 杂志文章
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更新日期:1999-04-01 00:00:00