Abstract:
:Normal penile erectile function is dependent on arterial adequacy, appropriate venous occlusion, neurohumoral factors, and finally the relaxation of penile cavernous trabecular smooth muscle. The present experiments were designed to test whether compounds related to endothelium-derived relaxing factor have a role in penile smooth muscle relaxation and whether this role is preserved in clinically impotent tissue. Isometric tension experiments were conducted using strips of human tissue (appropriately obtained) from patients found to be impotent by clinical criteria. Glyceryl trinitrate and isosorbide dinitrate produced maximal relaxations of 66 and 63%, respectively, in tissues contracted with norepinephrine: 50% relaxation was observed at 6 x 10(-7) and 8 x 10(-5) M, respectively. The finding of a relaxant response to synthetic nitrovasodilators in "impotent" tissue implies that (i) complete end organ (smooth muscle) failure is not always, if ever, seen, (ii) endothelium-derived factors probably play a role in erectile tissue parallel with their role in other vascular tissues, (iii) more proximal factors may be responsible for clinical impotence, and (iv) synthetic nitrovasodilators may have a role in the therapy of clinical impotence.
journal_name
Can J Physiol Pharmacoljournal_title
Canadian journal of physiology and pharmacologyauthors
Heaton JPdoi
10.1139/y89-014subject
Has Abstractpub_date
1989-01-01 00:00:00pages
78-81issue
1eissn
0008-4212issn
1205-7541journal_volume
67pub_type
杂志文章abstract::The numbers and sizes of nerve fibres to the dorsal neck muscles, splenius, complexus and biventer cervicis have been examined in the cat. The total number of fibres is unusually high as is the content of sensory fibres (estimated as the loss of fibres after ganglionectomy). The fibre spectra of these sensory nerves h...
journal_title:Canadian journal of physiology and pharmacology
pub_type: 杂志文章
doi:10.1139/y76-043
更新日期:1976-06-01 00:00:00
abstract::The sodium-hydrogen exchanger (NHE) helps the cell to recover from intracellular acidosis. In this study, we have investigated the effect of HOE 642 (a specific NHE1 blocker) on papillary muscles from rats and guinea pigs during transient acidosis and PKC activation by recording developed force (DF), action potential ...
journal_title:Canadian journal of physiology and pharmacology
pub_type: 杂志文章
doi:10.1139/y03-091
更新日期:2003-10-01 00:00:00
abstract::Our objective was to determine the effects of a clenbuterol (CB) treatment orally administered (2 mg per kg) to rats submitted to 14 days of hindlimb unloading (HU). The morphological and the contractile properties as well as the myosin heavy chain isoforms contained in each fiber type were determined in whole soleus ...
journal_title:Canadian journal of physiology and pharmacology
pub_type: 杂志文章
doi:10.1139/y04-034
更新日期:2004-05-01 00:00:00
abstract::Input to the nucleus medianus of the preoptic region has been suggested to be involved in both the drinking and pressor responses elicited by the central administration of angiotensin II. Evidence in support of this suggestion has been gained principally from electrical lesion experiments. This lesion procedure does n...
journal_title:Canadian journal of physiology and pharmacology
pub_type: 杂志文章
doi:10.1139/y88-176
更新日期:1988-08-01 00:00:00
abstract::The experiment examined biological responses produced by combined sequential exposure to low-level tritium contamination, followed by challenging irradiation with fast neutrons. Modifications of endogenous antioxidant potential of different organs in rats were discussed in relation to tissue radiosensitivity. Rats pre...
journal_title:Canadian journal of physiology and pharmacology
pub_type: 杂志文章
doi:10.1139/y02-089
更新日期:2002-07-01 00:00:00
abstract::It has been proposed that medullary washout secondary to increased blood flow will limit maximal urine osmolality and reabsorption of salt and water from the inner medullary collecting duct. We have tested this prediction. The function of the inner medullary collecting duct was examined by microcatheterization. Acetyl...
journal_title:Canadian journal of physiology and pharmacology
pub_type: 杂志文章
doi:10.1139/y87-383
更新日期:1987-12-01 00:00:00
abstract::Infusion of glucose alone or glucose with insulin in cats subjected to acute myocardial ischemia did not alter the hemodynamic response of the cats to coronary artery ligation. Furthermore, determination of myocardial creatine phosphokinase (CPK) (ATP:creatine N-phosphotransferase, EC 2.7.3.2) activities failed to rev...
journal_title:Canadian journal of physiology and pharmacology
pub_type: 杂志文章
doi:10.1139/y76-060
更新日期:1976-08-01 00:00:00
abstract::A new antagonist of the vasoconstrictor eicosanoids, L-640,035, was studied in a standardized model of myocardial ischemia (MI) in anesthetized cats. This eicosanoid antagonist was not found to exert any overt hemodynamic action in cats subjected to a sham myocardial ischemia protocol. However, the antagonist markedly...
journal_title:Canadian journal of physiology and pharmacology
pub_type: 杂志文章
doi:10.1139/y84-246
更新日期:1984-12-01 00:00:00
abstract::The aim of this study was to explore the possibility of identifying clusters of children's games based on estimated energy expenditures and (or) intensity when performed in a guided active play format. The study also investigated whether the identified active play game clusters were repeatable when the games were perf...
journal_title:Canadian journal of physiology and pharmacology
pub_type: 杂志文章,随机对照试验
doi:10.1139/y2012-106
更新日期:2012-09-01 00:00:00
abstract::The objective of this study was to investigate the protective effects of pomegranate (Punica granatum) juice (PGJ) on oxidative damages in liver tissue and erythrocytes of rats intoxicated by sodium fluoride (NaF). Rats were randomly divided into two groups: group I received standard diet and group II received orally ...
journal_title:Canadian journal of physiology and pharmacology
pub_type: 杂志文章
doi:10.1139/cjpp-2015-0226
更新日期:2016-07-01 00:00:00
abstract::G protein-coupled receptors (GPCRs), including endothelin receptor A (ETA) and B (ETB), may form dimers or higher-order oligomers that profoundly influence signaling. Here we examined a PDZ finger motif within the C-terminus of ETA and its role in heterodimerization with ETB, and in homodimerization with itself, when ...
journal_title:Canadian journal of physiology and pharmacology
pub_type: 杂志文章
doi:10.1139/Y08-050
更新日期:2008-08-01 00:00:00
abstract::The objective of this study was to investigate under controlled conditions the effects of fentanyl on the rat locus coeruleus catechol oxidation current. Using differential normal pulse voltammetry combined with electrochemically treated carbon fiber electrodes to measure the catechol oxidation current, catecholamine ...
journal_title:Canadian journal of physiology and pharmacology
pub_type: 杂志文章
doi:10.1139/y89-085
更新日期:1989-05-01 00:00:00
abstract::We examined whether there was a threshold for change in fetal arterial PO2 to elicit alterations in plasma adrenocorticotropic hormone, arginine vasopressin, or cortisol, or to affect the incidence of fetal breathing movements or eye movements and we determined whether such a threshold changed with gestational age. Fe...
journal_title:Canadian journal of physiology and pharmacology
pub_type: 杂志文章
doi:10.1139/y90-080
更新日期:1990-05-01 00:00:00
abstract::When carbon tetrachloride (CCl4) was administered to rats, a localized region of hepatic edema could be detected within 1 h by in vivo proton magnetic resonance imaging. However, if rats were pretreated with gadolinium chloride (GdCl3), an inhibitor of Kupffer cell function, the CCl4-induced edema was greatly decrease...
journal_title:Canadian journal of physiology and pharmacology
pub_type: 杂志文章
doi:10.1139/y94-064
更新日期:1994-05-01 00:00:00
abstract::It has been reported that the intraportal infusion of glutamine in Munich-Wistar rats will cause depression of renal perfusion and the urinary excretion of salt and water. We have attempted to reproduce these findings in anaesthetized dogs. L-Glutamine was infused at doses between 120 and 150 mumol/min into the portal...
journal_title:Canadian journal of physiology and pharmacology
pub_type: 杂志文章
doi:10.1139/y92-201
更新日期:1992-10-01 00:00:00
abstract::Visual acuity was measured behaviorally in various groups of cats by using a two-choice discrimination procedure. Cats in group 1 were rendered strabismic soon after birth by sectioning the tendon of the lateral rectus muscle (unilateral esotropia); at adulthood, their visual acuity (VA) was evaluated, after which the...
journal_title:Canadian journal of physiology and pharmacology
pub_type: 杂志文章
doi:10.1139/y95-195
更新日期:1995-09-01 00:00:00
abstract::Phosphofructokinase activity was measured in the sciatic nerve of streptozotocin-induced diabetic and nondiabetic rats. Average steady-state phosphofructokinase activity was obtained from three consecutive segments of the mid-femoral region in the left sciatic nerve in both diabetic (4 and 24 weeks) and nondiabetic, a...
journal_title:Canadian journal of physiology and pharmacology
pub_type: 杂志文章
doi:10.1139/y90-198
更新日期:1990-10-01 00:00:00
abstract::The level of circulating triacylglycerols is determined by the balance between their delivery into the plasma and their removal from it. Plasma triacylglycerols are derived either from dietary fat as chylomicrons or from endogenous hepatic synthesis as very low density lipoproteins. Their removal occurs through the ac...
journal_title:Canadian journal of physiology and pharmacology
pub_type: 杂志文章,评审
doi:10.1139/y91-242
更新日期:1991-11-01 00:00:00
abstract::The cannabinoid system has been suspected to play a role in the mechanisms of action of dipyrone and paracetamol. Our purpose was to measure the local endocannabinoid and N-acylethanolamide levels in the brain and spinal cord of rats following dipyrone and paracetamol administration. Nociception was assessed 1, 5, and...
journal_title:Canadian journal of physiology and pharmacology
pub_type: 杂志文章
doi:10.1139/cjpp-2019-0015
更新日期:2019-11-01 00:00:00
abstract::Heme plays a critical role in blood pressure regulation because it is required by a number of enzymes that synthesize vascular modulators, including nitric oxide (NO), carbon monoxide (CO), guanosine 3',5'-cyclic monophosphate (cGMP), endothelium-derived hyperpolarizing factor (EDHF), and prostacyclin. The goal of thi...
journal_title:Canadian journal of physiology and pharmacology
pub_type: 杂志文章
doi:10.1139/y08-064
更新日期:2008-09-01 00:00:00
abstract::Alterations in electrical conductivity between smooth muscle cells (SMCs) can alter the spread and effectiveness of electromechanical SMC contraction. We attempted to determine whether alterations in pressure-dependent constriction (PDC) occurring in relation to stroke development within the middle cerebral arteries (...
journal_title:Canadian journal of physiology and pharmacology
pub_type: 杂志文章
doi:
更新日期:1998-02-01 00:00:00
abstract::The our objective was to investigate the adaptations induced by a low-protein, high-carbohydrate (LPHC) diet in growing rats, which by comparison with the rats fed a control (C) diet at displayed lower fasting glycemia and similar fasting insulinemia, despite impairment in insulin signaling in adipose tissues. In the ...
journal_title:Canadian journal of physiology and pharmacology
pub_type: 杂志文章
doi:10.1139/cjpp-2013-0346
更新日期:2014-06-01 00:00:00
abstract::Lumbar spine and mid-radius bone mineral density was measured repeatedly in 48 postmenopausal women who completed 7 years of taking either a 500 mg x day(-1) calcium supplement (n = 22) or calcium supplementation with hormone replacement therapy. The hormone replacement was either a low dose (n = 15) or a moderate dos...
journal_title:Canadian journal of physiology and pharmacology
pub_type: 临床试验,杂志文章
doi:
更新日期:1999-07-01 00:00:00
abstract::This study has investigated the oral activity, following intragastric administration, of three potent and long-acting peptide-based bradykinin antagonists, HOE-140, B9430, and CP-0597, in the anesthetized rat, using bradykinin-induced hypotension. Two of the three bradykinin antagonists, B9430 and HOE-140, but not CP-...
journal_title:Canadian journal of physiology and pharmacology
pub_type: 杂志文章
doi:
更新日期:1997-06-01 00:00:00
abstract::It was recently shown that a peptide (hypertensive factor, HF) isolated from erythrocyte hemolysates from spontaneously hypertensive rats induced a prolonged elevation of blood pressure in normotensive rats. In addition, the peptide produced a marked stimulation of the in vitro uptake of lanthanum-resistant calcium by...
journal_title:Canadian journal of physiology and pharmacology
pub_type: 杂志文章
doi:10.1139/y88-209
更新日期:1988-10-01 00:00:00
abstract::Childhood cancer survivors can develop significant cardiac dysfunction in adulthood as a consequence of their cancer treatment. Studies have linked heart failure during pregnancy to childhood doxorubicin (DOX) exposure. We hypothesized that DOX injection would reduce cardiac function peripartum and that DOX-treated da...
journal_title:Canadian journal of physiology and pharmacology
pub_type: 杂志文章
doi:10.1139/y2012-126
更新日期:2012-11-01 00:00:00
abstract::The contribution of metabolic control to in vivo myocardial contractile function in response to beta 1-adrenergic stimulation was determined in the spontaneously diabetic BB Wor rat. The study involved a group of insulin-dependent BB Wor rats showing marked variations in metabolic control, assessed by the level of gly...
journal_title:Canadian journal of physiology and pharmacology
pub_type: 杂志文章
doi:10.1139/y94-103
更新日期:1994-07-01 00:00:00
abstract::Small, sinusoidal length changes were superimposed on isometric contractions of fast- and slow-twitch mouse muscles, which were stimulated maximally via their nerves. Stiffness increased with increasing frequency of sinusoidal stimulation, but the relative time course of force and stiffness changes during twitch, teta...
journal_title:Canadian journal of physiology and pharmacology
pub_type: 杂志文章
doi:10.1139/y86-209
更新日期:1986-09-01 00:00:00
abstract::Connexin43 has been recognized as forming gap junctions in Leydig cells. However, previous work has shown that mouse Leydig cells lacking this connexin do not suffer any limitation of their ability to produce testosterone when stimulated with luteinizing hormone. The objective of this study was to identify additional ...
journal_title:Canadian journal of physiology and pharmacology
pub_type: 杂志文章
doi:10.1139/cjpp-2012-0385
更新日期:2013-02-01 00:00:00
abstract::Two natriuretic peptides, atrial natriuretic peptide (ANP) and B-type natriuretic peptide (BNP), are found principally in the heart. In preliminary experiments with mouse kidney cells or slices, we found mouse BNP1-45 much more potent than ANP1-28 in causing elevations of cGMP (>50-fold). The guanylyl cyclase-A (GC-A)...
journal_title:Canadian journal of physiology and pharmacology
pub_type: 杂志文章
doi:
更新日期:2001-08-01 00:00:00