Abstract:
:1. This study aimed to investigate the protective effects of isosteviol against myocardial ischaemia-reperfusion (IR) injury and its effects on mitochondrial adenosine triphosphate (ATP)-sensitive potassium channel (mitoK(ATP)) activity in vitro. 2. Groups of eight guinea pigs were treated as follows: constant perfusion control (PC), IR control, ischaemic preconditioning (IPC) + IR, isosteviol (50, 250 or 500 nmol) + IR, 5-hydroxydecanoate acid (5-HD) (5 micromol) + isosteviol (500 nmol) + IR. The guinea pig heart was isolated and perfused in Langendorff mode with modified Tyrode solution at a flow rate of 10 mL/min. Ischaemia was introduced for 30 min followed by reperfusion for 20 min. Cardiac function, coronary arterial flow rate, lactate dehydrogenase (LDH) and creatine kinase (CK) activities in the perfusate were measured prior to ischaemia and at the end of reperfusion. 3. There were no significant (P > 0.05) changes in cardiac function or markers of cell damage (i.e. activities of LDH and CK) in the PC group. In contrast, cardiac function was adversely affected in the IR group, with significant (P < 0.05) decreases in left ventricular developing pressure (LVDevP), dP/dt(max) and dP/dt(min) compared with baseline and the PC group. In addition, there were increases in activity of LDH (20%) and CK (67%) compared with baseline and the PC group. 4. Ischaemic preconditioning and pretreatment with isosteviol, at all dose levels, resulted in a significant (P < 0.05) attenuation of IR injury. Lactate dehydrogenase and CK activities were not significantly (P < 0.05) different compared with baseline. Isosteviol did not increase coronary flow, suggesting that the protective effect of isosteviol on the myocardium was not mediated by dilation of the coronary blood vessels. 5. Pretreatment with the mitoK(ATP) blocker 5-HD partially antagonized the effects of 500 nmol isosteviol, with a statistically significant attenuation of its protective effects on HR, LVDevP, dP/dt(max) and dP/dt(min) compared with isosteviol alone pretreatment. 6. The IR injury on the Langendorff perfused guinea pig heart was alleviated by isosteviol, which appears to mediate its effects through mitoK(ATP) channels. Future research might aim to investigate the interaction of isosteviol with mitoK(ATP) channels in order to clarify its mechanism of action.
journal_name
Clin Exp Pharmacol Physioljournal_title
Clinical and experimental pharmacology & physiologyauthors
Xu D,Zhang S,Foster DJ,Wang Jdoi
10.1111/j.1440-1681.2007.04599.xsubject
Has Abstractpub_date
2007-05-01 00:00:00pages
488-93issue
5-6eissn
0305-1870issn
1440-1681pii
CEP4599journal_volume
34pub_type
杂志文章abstract::1. The effect of propofol on cardiac whole-cell sodium currents and single sodium channels in rat isolated ventricular myocytes was examined using patch-clamp techniques. 2. Propofol caused a block of the whole-cell sodium current, the potency of block depending on the holding potential. When cells were held at -90 mV...
journal_title:Clinical and experimental pharmacology & physiology
pub_type: 杂志文章
doi:10.1111/j.1440-1681.1998.tb02360.x
更新日期:1998-05-01 00:00:00
abstract::1. The effects of the Class I anti-arrhythmic drugs quinidine, procainamide, lidocaine, phenytoin and tocainide on mitochondrial lactate dehydrogenase activity were compared in guinea-pig heart preparations. 2. All the tested drugs inhibited the enzyme activity in a concentration-dependent fashion, exhibiting varying ...
journal_title:Clinical and experimental pharmacology & physiology
pub_type: 杂志文章
doi:10.1111/j.1440-1681.1993.tb01671.x
更新日期:1993-04-01 00:00:00
abstract::1. Neuropeptide Y (NPY) is colocalized with catecholamines in central regions involved in blood pressure regulation and exerts depressor responses in the nucleus tractus solitarius (NTS). Ageing is accompanied by a decline in baroreflex function and a reduction in NPY concentrations in some brain areas. The present st...
journal_title:Clinical and experimental pharmacology & physiology
pub_type: 杂志文章
doi:10.1111/j.1440-1681.1997.tb01801.x
更新日期:1997-02-01 00:00:00
abstract::1. The reproducibility of blood volume measurements, using [51Cr]-labelled red blood cells (RBC) was tested in three lambs, 79-89 days of age, and the accuracy was tested in eight lambs, 83 +/- 0.4 days of age, in which blood volume was measured simultaneously by [51Cr]-RBC and [125I]-gamma globulin plus haematocrit (...
journal_title:Clinical and experimental pharmacology & physiology
pub_type: 杂志文章
doi:10.1111/j.1440-1681.1994.tb02557.x
更新日期:1994-07-01 00:00:00
abstract::1. The administration of coumarin resulted in a two-fold increase in the entry of 51Cr-labelled rat plasma protein into otherwise normal tissues. 2. Prior treatment of rats with coumarin allowed about 50% more radio-labelled protein to enter the tissues immediately after thermal injury than occurred with thermal injur...
journal_title:Clinical and experimental pharmacology & physiology
pub_type: 杂志文章
doi:10.1111/j.1440-1681.1976.tb00633.x
更新日期:1976-11-01 00:00:00
abstract::The aim of this study was to investigate whether enoxaparin (ENX) administration would increase seroma risk and worsen mesh tissue recovery in an experimental rat hernia repair model. Fifty-six adult male Wistar-Albino rats were included in the study. Rats were equally and randomly separated into seven groups: Group 1...
journal_title:Clinical and experimental pharmacology & physiology
pub_type: 杂志文章
doi:10.1111/1440-1681.12582
更新日期:2016-07-01 00:00:00
abstract::1. Renin mRNA is present in the kidney and, in lower concentrations, in many extrarenal tissues and serves as an index of renin gene activity, as well as potential renin or prorenin synthesis in cell populations within those tissues. Unfortunately the quantity can be very low. 2. A new, highly sensitive technique is d...
journal_title:Clinical and experimental pharmacology & physiology
pub_type: 杂志文章
doi:10.1111/j.1440-1681.1991.tb01463.x
更新日期:1991-05-01 00:00:00
abstract::1. Endothelial dysfunction is seen in patients with essential hypertension or congestive heart failure (CHF). The present study aimed to evaluate the direct effect on endothelium- dependent vasodilation (EDV) of different pharmacological drugs commonly used in the treatment of these conditions. 2. Forearm blood flow (...
journal_title:Clinical and experimental pharmacology & physiology
pub_type: 临床试验,杂志文章
doi:10.1046/j.1440-1681.2001.03465.x
更新日期:2001-05-01 00:00:00
abstract::1. In rats, inhibition of type IV phosphodiesterase (PDE4) attenuates acute renal failure and early (hours) mortality induced by high-dose endotoxin. Because it is unlikely that protection of renal function accounts for improved early survivability, most likely PDE4 inhibition exerts multiple beneficial effects in end...
journal_title:Clinical and experimental pharmacology & physiology
pub_type: 杂志文章
doi:10.1046/j.1440-1681.2000.03332.x
更新日期:2000-10-01 00:00:00
abstract::1. There has been considerable recent interest in the possibility that increased intake of dietary anti-oxidants may protect against cardiovascular disease. This is partly due to the knowledge that oxidative events in vivo may play a role in the pathogenesis of atherosclerosis. 2. While dietary anti-oxidants, such as ...
journal_title:Clinical and experimental pharmacology & physiology
pub_type: 杂志文章,评审
doi:10.1046/j.1440-1681.2000.03214.x
更新日期:2000-03-01 00:00:00
abstract::1. Dexamethasone (Dex)-induced hypertension is characterized by endothelial dysfunction associated with nitric oxide (NO) deficiency and increased superoxide (O2-) production. Atorvastatin (Ato) possesses pleiotropic properties that have been reported to improve endothelial function through increased availability of N...
journal_title:Clinical and experimental pharmacology & physiology
pub_type: 杂志文章
doi:10.1111/j.1440-1681.2006.04482.x
更新日期:2006-11-01 00:00:00
abstract::1. None of the genes responsible for essential hypertension has been identified. Recent work in genetically hypertensive rats has shown linkage of blood pressure with alleles of the renin gene. Since the renin gene is a member of a conserved synteny group that in humans spans chromosome 1q21.3-32.3 and includes the ge...
journal_title:Clinical and experimental pharmacology & physiology
pub_type: 杂志文章
doi:10.1111/j.1440-1681.1991.tb01464.x
更新日期:1991-05-01 00:00:00
abstract::1. The transplacental transfer of D-xylose was investigated in the present study. 2. Umbilical perfusion of the rat term placenta was used to study materno-foetal (M-F) and foetomaternal (F-M) transfer of this compound. 3. D-Xylose was found to cross the rat term placenta very quickly in the M-F direction, with subseq...
journal_title:Clinical and experimental pharmacology & physiology
pub_type: 杂志文章
doi:10.1111/j.1440-1681.1998.tb02144.x
更新日期:1998-01-01 00:00:00
abstract::1. Acute myocardial infarction (AMI) is strongly associated with atherosclerosis, and is responsible for significant morbidity and mortality worldwide. The pathogenic mechanisms that underlie atherosclerosis and AMI are undefined at present. The calcium-sensing receptor (CaSR) is a member of the superfamily of G-prote...
journal_title:Clinical and experimental pharmacology & physiology
pub_type: 杂志文章
doi:10.1111/j.1440-1681.2010.05345.x
更新日期:2010-03-01 00:00:00
abstract::1. In order to find an anaesthesia with minimum perturbation to the metabolism of chylomicrons, the effects of seven different anaesthetic agents on clearance from plasma of chylomicron-like emulsions were compared. 2. Avertin, urethane, fentanyl, and a ketamine/xylazine mixture all slowed the removal from plasma of e...
journal_title:Clinical and experimental pharmacology & physiology
pub_type: 杂志文章
doi:10.1111/j.1440-1681.1993.tb01502.x
更新日期:1993-01-01 00:00:00
abstract::1. Enzymatic bioremediation is potentially a rapid method of removing environmental pesticide residues. Applications include the treatment of residues resulting from agricultural production and processing industries, such as the treatment of irrigation waters, surface-contaminated fruit and vegetables and spent dip li...
journal_title:Clinical and experimental pharmacology & physiology
pub_type:
doi:10.1111/j.1440-1681.2004.04088.x
更新日期:2004-11-01 00:00:00
abstract::1. Aldosterone is a hormone that affects both blood pressure and glucose homeostasis. We studied the association of the aldosterone synthase gene (CYP11B2) polymorphism -344T>C with essential hypertension (EH) and glucose homeostasis in people in China. 2. We investigated the polymorphism -344T>C in CYP11B2 using a ca...
journal_title:Clinical and experimental pharmacology & physiology
pub_type: 杂志文章
doi:10.1111/j.1440-1681.2011.05555.x
更新日期:2011-09-01 00:00:00
abstract::The aim of the present study was to investigate the effect of prostaglandin (PG) E1 on hypoxia/re-oxygenation (H/R) apoptosis and the expression of bcl-2 and bax in cultured neonatal rat cardiomyocytes. The H/R model was made using the first generation of cultured neonatal rat cardiomyocytes. Hypoxia/re-oxygenation ap...
journal_title:Clinical and experimental pharmacology & physiology
pub_type: 杂志文章
doi:10.1111/j.1440-1681.2005.04311.x
更新日期:2005-12-01 00:00:00
abstract::1. Adult soft-shelled turtles were exposed to hyperosmotic and dehydration stresses. 2. Acute treatment for 0.5, 1 or 2 h with sodium chloride (3.6%, single intramuscular injection, 2 mL volume) caused depletion of pineal serotonin contents followed by elevation of norepinephrine and epinephrine levels. In addition, i...
journal_title:Clinical and experimental pharmacology & physiology
pub_type: 杂志文章
doi:10.1111/j.1440-1681.1991.tb01386.x
更新日期:1991-10-01 00:00:00
abstract::1. The effects of two naturally occurring substances, namely taurine and catechins, on serum cholesterol levels and on the progression of atherosclerotic lesions were evaluated using spontaneously hyperlipidaemic (SHL) mice as an animal model of atherogenesis. 2. Twelve weeks treatment of SHL mice with taurine (1% in ...
journal_title:Clinical and experimental pharmacology & physiology
pub_type: 杂志文章
doi:10.1046/j.1440-1681.2003.03828.x
更新日期:2003-04-01 00:00:00
abstract::1. The present study was undertaken to elucidate the effects of parecoxib, a novel cyclo-oxygenase (COX)-2 inhibitor, on spontaneous and prostaglandin-induced contractions of uterine smooth muscle. 2. Non-pregnant adult Wistar rats were decapitated and dissected to isolate myometrial strips. The tissue was mounted in ...
journal_title:Clinical and experimental pharmacology & physiology
pub_type: 杂志文章
doi:10.1111/j.1440-1681.2007.04632.x
更新日期:2007-08-01 00:00:00
abstract::1. In cats anaesthetized with alpha-chloralose, electrical stimulation (ES) of the trigeminal ganglion produced a fall in blood pressure, a predominantly ipsilateral dilatation in the common carotid vascular bed and bilateral dilatation of the middle meningeal vascular bed. Section of the trigeminal root abolished the...
journal_title:Clinical and experimental pharmacology & physiology
pub_type: 杂志文章
doi:10.1111/j.1440-1681.1997.tb01206.x
更新日期:1997-06-01 00:00:00
abstract::1. Quantitative autoradiography and homogenate radioligand binding of [125I]-Bolton Hunter substance P ([125I]-BHSP) were used to compare brain NK1 receptors in young (2 months) and aged (18-20 months) rats. 2. The autoradiographic distribution and density of [125I]-BHSP binding sites was similar in all cortical regio...
journal_title:Clinical and experimental pharmacology & physiology
pub_type: 杂志文章
doi:10.1046/j.1440-1681.2002.03781.x
更新日期:2002-12-01 00:00:00
abstract::1. The distribution of binding sites for [125I]-labelled endothelin-1 ([125I]-ET-1) and [125I]-labelled sarafotoxin S6B ([125I]-SRT) was visualized in rat tissues using in vitro autoradiography. 2. A high density of endothelin-1 (ET-1) binding was found in the heart. In the kidney, ET-1 binding occurred in association...
journal_title:Clinical and experimental pharmacology & physiology
pub_type: 杂志文章
doi:10.1111/j.1440-1681.1991.tb01485.x
更新日期:1991-07-01 00:00:00
abstract::1. Prenatal dexamethasone leads to low birth weight and compromises organogenesis, but its effects on nephrogenesis in male and female rats have not yet been investigated extensively. Reduced renal mass may be responsible for hypertension and renal haemodynamic and morphological adjustments to maintain the glomerular ...
journal_title:Clinical and experimental pharmacology & physiology
pub_type: 杂志文章
doi:10.1046/j.1440-1681.2003.03787.x
更新日期:2003-01-01 00:00:00
abstract::1. It is well documented that cisplatin (CDDP) treatment increases the expression of adenosine A(1) receptors in both kidney and testes. However, the effect of adenosine at these receptors is controversial. Adenosine A(1) receptors have been documented to be involved in either cytoprotection or aggravation of nephroto...
journal_title:Clinical and experimental pharmacology & physiology
pub_type: 杂志文章
doi:10.1111/j.1440-1681.2004.04127.x
更新日期:2004-12-01 00:00:00
abstract::Central administration of choline increases blood pressure in normotensive and hypotensive states by increasing plasma concentrations of vasopressin and catecholamines. We hypothesized that choline could also modulate the renin-angiotensin pathway, the third main pressor system in the body. Plasma renin activity (PRA)...
journal_title:Clinical and experimental pharmacology & physiology
pub_type: 杂志文章
doi:10.1111/j.1440-1681.2008.04978.x
更新日期:2008-09-01 00:00:00
abstract::1. In infants, promethazine has been implicated in the pathogenesis of sleep apnoea, apparent life threatening events (ALTE) and the Sudden Infant Death syndrome (SIDS). The aim of the present study was to investigate, in a neonatal animal, the effects of a commonly used promethazine-containing medication on airway pr...
journal_title:Clinical and experimental pharmacology & physiology
pub_type: 杂志文章
doi:10.1046/j.1440-1681.2001.03483.x
更新日期:2001-07-01 00:00:00
abstract::1. The object of this study was to determine whether meat protein per se is responsible for the higher blood pressures (BP) in omnivores compared with vegetarians. 2. Assessments were made by a double blind randomized control trial in 64 normotensive volunteers recruited from Royal Perth Hospital staff. 3. All volunte...
journal_title:Clinical and experimental pharmacology & physiology
pub_type: 临床试验,杂志文章,随机对照试验
doi:10.1111/j.1440-1681.1987.tb00368.x
更新日期:1987-03-01 00:00:00
abstract::1. The functional innervation of autonomic target tissues occurs early during development, at a time when both the nerves and post-synaptic target tissues are still differentiating. 2. Physiological responses appear soon after the arrival of the first fibres when uptake and release mechanisms within the nerves are alr...
journal_title:Clinical and experimental pharmacology & physiology
pub_type: 杂志文章,评审
doi:10.1046/j.1440-1681.1999.03092.x
更新日期:1999-08-01 00:00:00