Abstract：
:1. Contractile responses to short trains of nerve stimulation have been characterized in small, medium and large arteries from the rat mesenteric circulation (5th - 6th, 2nd - 3rd and 1st order, respectively). In addition, sources of calcium for smooth muscle contraction have been investigated. 2. Nerve stimulation (10 pulses at 10 Hz) evoked reproducible contractions. The P2 receptor antagonist suramin (100 microM) reduced constrictions by 65.3+/-7.4, 82.7+/-3.3 and 3.1+/-6.1% in small, medium and large arteries respectively. The alpha-adrenoceptor antagonist prazosin (0.1 microM) reduced responses by 32.6+/-2.6, 27.0+/-1.5 and 97.0+/-1.9% respectively. 3. The L-type calcium channel antagonist nifedipine (1 microM) reduced nerve-evoked contractions by 2.8+/-3.3, 10.0+/-3.7 and 13.5+/-2.7% in small, medium and large arteries respectively. When the adrenergic component of contraction was blocked by prazosin (0.1 microM) nifedipine reduced responses by 4.6+/-7.9, 14.3+/-2.0 and 3.0+/-1.9% respectively. Contractile responses to exogenous alpha,beta-meATP were unaffected by the depletion of calcium stores with cyclopiazonic acid (30 microM). This indicates that mobilization of calcium from internal stores is not required for P2X receptor mediated smooth muscle contraction. We conclude that for neurogenic responses, the P2X receptor mediated component of constriction dominates in small mesenteric arteries (3rd -- 6th order) while in large arteries (1st order) noradrenaline mediates contraction. For P2X receptor mediated responses all the calcium required for smooth muscle contraction enters the cell directly through P2X receptor channels.
journal_name
Br J Pharmacoljournal_title
British journal of pharmacologyauthors
Gitterman DP,Evans RJdoi
10.1038/sj.bjp.0703925subject
Has Abstractpub_date
2001-03-01 00:00:00pages
1201-8issue
6eissn
0007-1188issn
1476-5381journal_volume
132pub_type
杂志文章abstract：BACKGROUND AND PURPOSE:Here, we have compared the neurochemical profile of three new cathinones, butylone, mephedrone and methylone, in terms of their potential to inhibit plasmalemmal and vesicular monoamine transporters. Their interaction with 5-HT and dopamine receptors and their psychostimulant effect was also stud...
journal_title：British journal of pharmacology
pub_type： 杂志文章
doi：10.1111/j.1476-5381.2012.01998.x
更新日期：2012-09-01 00:00:00
abstract：:1 The effect of compound 48/80 was studied on the twitch-like contractions of the longitudinal muscle of guinea-pig ileum induced by electrical stimulation of intramural cholinergic nerves. 2 Compound 48/80 alone, at concentrations up to 30 microgram/ml, had no effect on the twitch contractions. The contraction to exo...
journal_title：British journal of pharmacology
pub_type： 杂志文章
doi：10.1111/j.1476-5381.1978.tb17312.x
更新日期：1978-12-01 00:00:00
abstract：:1. Effects of morphine sulphate (1.25, 2.5, 5, 10, 20 and 40 mg/kg i.p.) on locomotor activity of male rats were observed for 8 h after single doses in non-tolerant rats. The lower three doses had only an excitatory effect, whereas the higher three doses caused initial depression followed by a delayed excitatory effec...
journal_title：British journal of pharmacology
pub_type： 杂志文章
doi：10.1111/j.1476-5381.1972.tb06866.x
更新日期：1972-10-01 00:00:00
abstract：:1. The effect on membrane currents of infection of mouse neuroblastoma NA cells with rabies virus was studied by using the whole-cell patch clamp technique. 2. Three types of membrane currents, namely voltage-dependent Na+ current (I(Na)), delayed rectifier K+ current (I(K-DR)) and inward rectifier K+ current (I(K-IR)...
journal_title：British journal of pharmacology
pub_type： 杂志文章
doi：10.1038/sj.bjp.0702473
更新日期：1999-04-01 00:00:00
abstract：:In this issue of the British Journal of Pharmacology, Ryberg et al. present convincing in vitro evidence that the orphan GPCR, GPR55, is a cannabinoid receptor. GPR55 was activated by a range of plant, synthetic and endogenous cannabinoids and blocked by the non-psychoactive phytocannabinoid, cannabidiol. Their experi...
journal_title：British journal of pharmacology
pub_type： 评论,杂志文章,评审
doi：10.1038/sj.bjp.0707464
更新日期：2007-12-01 00:00:00
abstract：BACKGROUND AND PURPOSE:Increased level of very low-density lipoprotein (VLDL) is a key feature of the metabolic syndrome and is associated with cardiovascular diseases. PPAR-δ agonists play a protective role in lipid metabolism and vascular function. In this study, we aimed to investigate the role of PPAR-δ in the upta...
journal_title：British journal of pharmacology
pub_type： 杂志文章
doi：10.1111/bph.13160
更新日期：2015-08-01 00:00:00
abstract：:The arterial endothelium critically contributes to blood pressure control by releasing vasodilating autacoids such as nitric oxide, prostacyclin and a third factor or pathway termed 'endothelium-derived hyperpolarizing factor' (EDHF). The nature of EDHF and EDHF-signalling pathways is not fully understood yet. However...
journal_title：British journal of pharmacology
pub_type： 杂志文章,评审
doi：10.1111/j.1476-5381.2009.00132.x
更新日期：2009-06-01 00:00:00
abstract：:1. We have investigated the role of endogenous nitric oxide on renal vascular reactivity in late pregnancy in in situ blood perfused kidneys of alpha-chloralose anaesthetized Wistar-Kyoto rats. Nitric oxide synthesis inhibition was achieved by intravenous administration of NG-nitro-L-arginine or NG-nitro-L-arginine me...
journal_title：British journal of pharmacology
pub_type： 杂志文章
doi：10.1038/sj.bjp.0701363
更新日期：1997-09-01 00:00:00
abstract：:1 A procedure involving two guinea-pig isolated hearts perfused in series is described for detecting in the recipient heart the release of a possible coronary vasodilator metabolite from the donor heart. 2 Adrenaline and isoprenaline stimulated the rate and force of contraction and produced a multiphasic coronary vasc...
journal_title：British journal of pharmacology
pub_type： 杂志文章
doi：10.1111/j.1476-5381.1976.tb07696.x
更新日期：1976-09-01 00:00:00
abstract：BACKGROUND AND PURPOSE:The presence of the histamine H₄ receptor (H₄R) was previously reported in benign and malignant lesions and cell lines derived from the human mammary gland. The aim of this work was to evaluate the effects of H₄R ligands on the survival, tumour growth rate and metastatic capacity of breast cancer...
journal_title：British journal of pharmacology
pub_type： 杂志文章
doi：10.1111/bph.12137
更新日期：2013-09-01 00:00:00
abstract：:The administration of arachidonic acid (AA) to the isolated perfused heart of the rat usually produced biphasic coronary responses characterized by initial vasoconstriction followed by prolonged vasodilatation. However, some responses were predominantly vasoconstrictor or vasodilator. The non-steroidal anti-inflammato...
journal_title：British journal of pharmacology
pub_type： 杂志文章
doi：10.1111/j.1476-5381.1982.tb08783.x
更新日期：1982-02-01 00:00:00
abstract：:1. The effects of 1H-[1,2,4]oxadiazolo[4,3-a]quinoxalin-1-one (ODQ), an inhibitor of soluble guanylyl cyclase (sGC), were investigated in aortic rings and ventricular cardiomyocytes from rats. The production of cyclic GMP was stimulated by NO.-donors or carbachol. Additionally, the effects of ODQ were studied in cytos...
journal_title：British journal of pharmacology
pub_type： 杂志文章
doi：10.1038/sj.bjp.0702608
更新日期：1999-06-01 00:00:00
abstract：:1 The effects of prostaglandin (PGE(1)), following local administration during different phases of developing sponge-induced granulomata, were studied in normal and essential fatty acid deficient (EFAD) rats.2 In normal rats, a single dose of 1 mug PGE(1) on implantation (day 1) increased exudate production without al...
journal_title：British journal of pharmacology
pub_type： 杂志文章
doi：10.1111/j.1476-5381.1979.tb07852.x
更新日期：1979-03-01 00:00:00
abstract：:1. Acetylcholine (ACh)-induced relaxation of aortic strips with endothelium and production of cyclic GMP between streptozotocin-induced diabetic and age-matched control rats were compared. 2. The concentration-response curve for ACh-induced relaxation was shifted to the right in diabetic rats. IC50 values for ACh were...
journal_title：British journal of pharmacology
pub_type： 杂志文章
doi：10.1111/j.1476-5381.1989.tb11993.x
更新日期：1989-06-01 00:00:00
abstract：:1 The concentrations of p- and m-tyramine were measured in the caudate nucleus of the rat brain following subcutaneous injection of reserpine or intraventricular injection of 6-hydroxydopamine, beta-Phenylethylamine was analysed in the hypothalamus after reserpine. 2 Endogenous levels of p-tyramine and m-tyramine in t...
journal_title：British journal of pharmacology
pub_type： 杂志文章
doi：10.1111/j.1476-5381.1977.tb06996.x
更新日期：1977-01-01 00:00:00
abstract：:1. The effects of various inhibitors of the mitochondrial electron transport chain on the activity of ATP-sensitive K+ channels were examined in the Cambridge rat insulinoma G1 (CRI-G1) cell line using a combination of whole cell and single channel recording techniques. 2. Whole cell current clamp recordings, with 5 m...
journal_title：British journal of pharmacology
pub_type： 杂志文章
doi：10.1038/sj.bjp.0702267
更新日期：1999-01-01 00:00:00
abstract：:1. We have studied the effect of cannabinoid agonists (CP 55,940 and cannabinol) on intestinal motility in a model of intestinal inflammation (induced by oral croton oil in mice) and measured cannabinoid receptor expression, endocannabinoids (anandamide and 2-arachidonylglycerol) and anandamide amidohydrolase activity...
journal_title：British journal of pharmacology
pub_type： 杂志文章
doi：10.1038/sj.bjp.0704293
更新日期：2001-10-01 00:00:00
abstract：:1. The aim of the study was to investigate the mechanism of a novel effect of hypoxia on intracellular Ca(2+) signalling in rabbit cerebral arteriolar smooth muscle cells, an effect that was resistant to the L-type Ca(2+) channel antagonist methoxyverapamil (D600). 2.[Ca(2+)](i) of smooth muscle cells in intact arteri...
journal_title：British journal of pharmacology
pub_type： 杂志文章
doi：10.1038/sj.bjp.0704547
更新日期：2002-02-01 00:00:00
abstract：:1. The blood pressure response to ranatensin, an undecapeptide from the skin of the frog, Rana pipiens, has been studied in various experimental animals.2. Ranatensin raised blood pressure in the dog and rabbit. The response was not altered by atropine, phentolamine, propranolol or hexamethonium, suggesting a direct p...
journal_title：British journal of pharmacology
pub_type： 杂志文章
doi：10.1111/j.1476-5381.1970.tb10641.x
更新日期：1970-12-01 00:00:00
abstract：:1. gamma-Aminobutyric acid (GABA) was applied by the 'concentration clamp' technique to isolated neurones of Aplysia. GABA induced a chloride current (ICl) due to activation of a single class of chloride-channel. 2. The concentration-response curve for the peak ICl gave an apparent dissociation constant of 6.4 X 10(-5...
journal_title：British journal of pharmacology
pub_type： 杂志文章
doi：10.1111/j.1476-5381.1988.tb11718.x
更新日期：1988-11-01 00:00:00
abstract：:1. The alpha 1-adrenoceptor subtypes mediating contractions of the smooth muscle in human prostatic urethra and branches of internal iliac artery were characterized in isometric contraction experiments. 2. Phenylephrine produced concentration-dependent contractions in both the urethra and artery. These responses were ...
journal_title：British journal of pharmacology
pub_type： 杂志文章
doi：10.1111/j.1476-5381.1994.tb17053.x
更新日期：1994-11-01 00:00:00
abstract：:1. The GABA-B receptor agonists baclofen and 3-aminopropylphosphinic acid (3-APPi) have antitussive activity in the cat and guinea pig. The purpose of this study was to investigate the sites of action of these GABA-B receptor agonists to inhibit the cough reflex. 2. Single intracerebroventricular (i.c.v.) cannulas wer...
journal_title：British journal of pharmacology
pub_type： 杂志文章
doi：10.1111/j.1476-5381.1994.tb17145.x
更新日期：1994-12-01 00:00:00
abstract：UNLABELLED:Midkine (MK) is a heparin-binding growth factor or cytokine and forms a small protein family, the other member of which is pleiotrophin. MK enhances survival, migration, cytokine expression, differentiation and other activities of target cells. MK is involved in various physiological processes, such as devel...
journal_title：British journal of pharmacology
pub_type： 杂志文章,评审
doi：10.1111/bph.12353
更新日期：2014-02-01 00:00:00
abstract：:Two splice isoforms of rabbit alpha(1a)-adrenergic receptor (AR), (named alpha(1a)-OCU.2-AR and alpha(1a)-OCU.3-AR) have been isolated from the liver cDNA library in addition to the previously reported isoform (alpha(1a)-OCU.1-AR). Although they have the identical splice position with human alpha(1a)-AR isoforms, the ...
journal_title：British journal of pharmacology
pub_type： 杂志文章
doi：10.1038/sj.bjp.0703242
更新日期：2000-04-01 00:00:00
abstract：:The uncoupling activity of oxyclozanide in warm blooded animals has been studied in whole animals, isolated tissue in vitro and on mitochondrial preparations. The onset of post mortem rigidity in mice and rats is accelerated and a contracture of striated muscle is produced. Oxyclozanide (1 muM) stimulated rat liver mi...
journal_title：British journal of pharmacology
pub_type： 杂志文章
doi：10.1111/j.1476-5381.1974.tb09622.x
更新日期：1974-03-01 00:00:00
abstract：:Obesity is a common metabolic disorder that has become a widespread epidemic in several countries. Sex and gender disparities in the prevalence of cardiovascular disease (CVD) have been well documented with premenopausal women having a lower incidence of CVD than age-matched men. However, women are more likely than me...
journal_title：British journal of pharmacology
pub_type： 杂志文章,评审
doi：10.1111/bph.14783
更新日期：2019-11-01 00:00:00
abstract：:1. U937 cells are a continuous line of human cells of committed monocytic origin which serve as a useful model for studying human monocytic function. The present study investigated the effect of platelet-activating factor (Paf) on intracellular free calcium ion concentration ([Ca2+]i) in U937 cells using the calcium f...
journal_title：British journal of pharmacology
pub_type： 杂志文章
doi：10.1111/j.1476-5381.1988.tb11461.x
更新日期：1988-04-01 00:00:00
abstract：BACKGROUND AND PURPOSE:Melanocortins reverse circulatory shock and improve survival by counteracting the systemic inflammatory response, and through the activation of the vagus nerve-mediated cholinergic anti-inflammatory pathway. To gain insight into the potential therapeutic value of melanocortins against multiple or...
journal_title：British journal of pharmacology
pub_type： 杂志文章
doi：10.1111/j.1476-5381.2010.01098.x
更新日期：2011-02-01 00:00:00
abstract：BACKGROUND AND PURPOSE:The synthetic compound efsevin was recently identified to suppress arrhythmogenesis in models of cardiac arrhythmia, making it a promising candidate for antiarrhythmic therapy. Its activity was shown to be dependent on the voltage-dependent anion channel 2 (VDAC2) in the outer mitochondrial membr...
journal_title：British journal of pharmacology
pub_type： 杂志文章
doi：10.1111/bph.15022
更新日期：2020-07-01 00:00:00
abstract：:1. Previous work from our laboratory has shown that cannabis induces aggressive behaviour in rats that have been deprived of rapid eye movement (REM) sleep. It was suggested that this effect was related to brain catecholamines, with dopamine playing an agonist role and noradrenaline an inhibitory one. The present pape...
journal_title：British journal of pharmacology
pub_type： 杂志文章
doi：10.1111/j.1476-5381.1977.tb08429.x
更新日期：1977-11-01 00:00:00
