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4-Aminopyridine inhibits the neuromuscular effects of nitric oxide and 8-Br-cGMP BJMBR
Queiroz,R.N.; Ramos,E.R.P.; Alves-Do-Prado,W..
The effects induced by nitric oxide (NO) in different tissues depend on direct and/or indirect interactions with K+ channels. The indirect interaction of NO is produced by activation of guanylyl cyclase which increases the intracellular cGMP. Since NO, cGMP and 4-aminopyridine alone induce tetanic fade and increase amplitude of muscular contractions in isolated rat neuromuscular preparations, the present study was undertaken to determine whether or not the neuromuscular effects of NO and 8-Br-cGMP can be modified by 4-aminopyridine. Using the phrenic nerve and diaphragm muscle isolated from male Wistar rats (200-250 g), we observed that L-arginine (4.7 mM) and 8-Br-cGMP (18 µM), in contrast to D-arginine, induced an increase in the amplitude of muscle...
Tipo: Info:eu-repo/semantics/other Palavras-chave: L-arginine; Nitric oxide; CGMP; Skeletal muscle; Tetanic fade; K+ channel.
Ano: 2003 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2003000700016
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5-HT1A autoreceptor modulation of locomotor activity induced by nitric oxide in the rat dorsal raphe nucleus BJMBR
Gualda,L.B.; Martins,G.G.; Müller,B.; Guimarães,F.S.; Oliveira,R.M.W..
The dorsal raphe nucleus (DRN) is the origin of ascending serotonergic projections and is considered to be an important component of the brain circuit that mediates anxiety- and depression-related behaviors. A large fraction of DRN serotonin-positive neurons contain nitric oxide (NO). Disruption of NO-mediated neurotransmission in the DRN by NO synthase inhibitors produces anxiolytic- and antidepressant-like effects in rats and also induces nonspecific interference with locomotor activity. We investigated the involvement of the 5-HT1A autoreceptor in the locomotor effects induced by NO in the DRN of male Wistar rats (280-310 g, N = 9-10 per group). The NO donor 3-morpholinosylnomine hydrochloride (SIN-1, 150, and 300 nmol) and the NO scavenger...
Tipo: Info:eu-repo/semantics/other Palavras-chave: Dorsal raphe nucleus; Nitric oxide; Serotonin; 5-HT1A receptor; Locomotor activity.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2011000400010
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A method for multiple sequential analyses of macrophage functions using a small single cell sample BJMBR
Nascimento,F.R.F.; Rodríguez,D.; Gomes,E.; Fernvik,E.C.; Russo,M..
Microbial pathogens such as bacillus Calmette-Guérin (BCG) induce the activation of macrophages. Activated macrophages can be characterized by the increased production of reactive oxygen and nitrogen metabolites, generated via NADPH oxidase and inducible nitric oxide synthase, respectively, and by the increased expression of major histocompatibility complex class II molecules (MHC II). Multiple microassays have been developed to measure these parameters. Usually each assay requires 2-5 x 10(5) cells per well. In some experimental conditions the number of cells is the limiting factor for the phenotypic characterization of macrophages. Here we describe a method whereby this limitation can be circumvented. Using a single 96-well microassay and a very small...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Macrophages; Nitric oxide; Hydrogen peroxide; MHC II; Method.
Ano: 2003 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2003000900012
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ABA regulation of post-germination desiccation tolerance in wheat cultivars contrasting in drought tolerance Anais da ABC (AABC)
KOUR,SATINDER; ZHAWAR,VIKRAMJIT K..
ABSTRACT Post-germination desiccation tolerance (DT) was studied in two wheat cultivars. Effect of pretreatment of abscisic acid (ABA)/ osmotic/ salt/ heat stress was also studied. One day (d)-old seedlings of wheat cultivars PBW 644 (drought tolerant) and PBW 343 (drought susceptible) were exposed to ABA/stress treatment for next 1 d, desiccated for 4 d and subsequently rehydrated for 4 d. Biomass, protein, water, protein carbonyls (oxidative toxicity) and nitric oxide (NO) levels were measured in 2 d (treated), 6 d (desiccated), 10 d (rehydrated) seedlings. Vegetative reactive oxygen species (ROS)/ NO-pathways were studied under normal condition and ABA supply by supplying ROS/NO scavengers. Desiccation caused water loss and increased oxidative toxicity....
Tipo: Info:eu-repo/semantics/article Palavras-chave: Abiotic; Abscisic acid; Nitric oxide; Post germination desiccation tolerance; Wheat.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000401493
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Activation of neural cholecystokinin-1 receptors induces relaxation of the isolated rat duodenum which is reduced by nitric oxide synthase inhibitors BJMBR
Martins,S.R.; de Oliveira,R.B.; Ballejo,G..
Cholecystokinin (CCK) influences gastrointestinal motility, by acting on central and peripheral receptors. The aim of the present study was to determine whether CCK has any effect on isolated duodenum longitudinal muscle activity and to characterize the mechanisms involved. Isolated segments of the rat proximal duodenum were mounted for the recording of isometric contractions of longitudinal muscle in the presence of atropine and guanethidine. CCK-8S (EC50: 39; 95% CI: 4.1-152 nM) and cerulein (EC50: 58; 95% CI: 18-281 nM) induced a concentration-dependent and tetrodotoxin-sensitive relaxation. Nomeganitro-L-arginine (L-NOARG) reduced CCK-8S- and cerulein-induced relaxation (IC50: 5.2; 95% CI: 2.5-18 µM) in a concentration-dependent manner. The magnitude...
Tipo: Info:eu-repo/semantics/article Palavras-chave: CCK; CCK receptor subtype 1; Proximal duodenum; Myenteric neurons; Nitric oxide.
Ano: 2006 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2006000200014
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Acute but not chronic metabolic acidosis potentiates the acetylcholine-induced reduction in blood pressure: an endothelium-dependent effect BJMBR
Celotto,A.C.; Ferreira,L.G.; Capellini,V.K.; Albuquerque,A.A.S.; Rodrigues,A.J.; Evora,P.R.B..
Metabolic acidosis has profound effects on vascular tone. This study investigated the in vivo effects of acute metabolic acidosis (AMA) and chronic metabolic acidosis (CMA) on hemodynamic parameters and endothelial function. CMA was induced by ad libitum intake of 1% NH4Cl for 7 days, and AMA was induced by a 3-h infusion of 6 M NH4Cl (1 mL/kg, diluted 1:10). Phenylephrine (Phe) and acetylcholine (Ach) dose-response curves were performed by venous infusion with simultaneous venous and arterial blood pressure monitoring. Plasma nitrite/nitrate (NOx) was measured by chemiluminescence. The CMA group had a blood pH of 7.15±0.03, which was associated with reduced bicarbonate (13.8±0.98 mmol/L) and no change in the partial pressure of arterial carbon dioxide...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Acid-base balance; Metabolic acidosis; Hemodynamic failure; Endothelium; Nitric oxide.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2016000200604
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Adenylyl cyclase types I and VI but not II and V are selectively inhibited by nitric oxide BJMBR
Goldstein,J.; Silberstein,C.; Ibarra,C..
Adenylyl cyclase (AC) isoforms catalyze the synthesis of 3',5'-cyclic AMP from ATP. These isoforms are critically involved in the regulation of gene transcription, metabolism, and ion channel activity among others. Nitric oxide (NO) is a gaseous product whose synthesis from L-arginine is catalyzed by the enzyme NO synthase. It has been well established that NO activates the enzyme guanylyl cyclase, but little has been reported on the effects of NO on other important second messengers, such as AC. In the present study, the effects of sodium nitroprusside (SNP), a nitric oxide-releasing compound, on COS-7 cells transfected with plasmids containing AC types I, II, V and VI were evaluated. Total inhibition (~98.5%) of cAMP production was observed in COS-7...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Adenylyl cyclase; Nitric oxide; Sodium nitroprusside; Cyclic AMP; COS-7 cells; Signal transduction.
Ano: 2002 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2002000200002
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Adiponectin Effect on Nitric Oxide Secretion by Normal and Endometriotic Human Endometrial Stromal Cells: in vitro Study International Journal of Morphology
Bohlouli,Somayeh; Khazaei,Mozafar; Rabzia,Arezou; Khazaei,Mohammad Rasool; Sadeghi,Ehsan.
Endometriosis is an estrogen-dependent disease in reproductive age women. Adiponectin and Nitric oxide (NO) have an important role in physiologic functions especially in human reproductive system. Levels of NO increased in the endometriosis patients but serum adiponectin levels decreased in woman with endometriosis. The aim of this study was to determine adiponectin effect on nitric oxide secretion by cultured normal and endometriotic human endometrial stromal cells. In this experimental study, normal (n= 10) and endometriotic endometrial biopsies (n= 10) were taken in sterile condition. Stromal cells isolated and cultured in in DMEM/ F12 medium and treated with adiponectin concentrations (0, 10, 100, and 200 ng/ml) for 24 and 48 hours. NO assay was done...
Tipo: Journal article Palavras-chave: Adiponectin; Nitric oxide; Endometriosis; Stromal cell.
Ano: 2015 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000100053
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Ameliorative effect of exogenous nitric oxide on oxidative metabolism in NaCl treated chickpea plants Braz. J. Plant Physiol.
Sheokand,Sunita; Bhankar,Vinita; Sawhney,Veena.
Accumulation of salts in irrigated soils is one of the primary factors limiting yield in South Asia. We investigated whether exogenous nitric oxide (NO) supplementation as sodium nitroprusside has any ameliorating effect against NaCl induced oxidative damage in chickpea leaves. NaCl treatment (250 mM) alone and in combination with two concentrations of SNP (0.2 and 1 mM) were given to 50 days old chickpea plants for 2, 4 and 6 days. Salt stress adversely affected the relative membrane injury, lipid peroxidation levels, relative water content (RWC) and H2O2 content. The effect was time dependent. SNP treatments could ameliorate the toxic effect of short term salt stress of 2 days on relative membrane injury and partial amelioration was observed with 4 and 6...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Antioxidant enzymes; Chickpea; Lipid peroxidation; Nitric oxide; Salt stress.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202010000200002
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Antagonic effect of the inhibition of inducible nitric oxide on the mortality of mice acutely infected with Escherichia coli and Bacteroides fragilis BJMBR
Astolfi,R.S.; Khouri,D.G.; Brandizzi,L.I.V.; Ávila-Campos,M.J.; Andrade Jr.,H.F. de.
Sepsis, the leading cause of death in intensive care units, is associated with overproduction of nitric oxide (NO) due to inducible NO synthase (iNOS), responsible for some of the pathologic changes. Aminoguanidine (AG) is a selective iNOS inhibitor with reported inconsistent actions in sepsis. To investigate the influence of iNOS, we studied models of acute bacterial sepsis using acute challenges with aerobic (Escherichia coli) and anaerobic (Bacteroides fragilis) bacteria in the presence of AG. Six-week-old, 23 g, male and female BALB/c and C57Bl/6j mice, in equal proportions, were inoculated (ip) with bacteria in groups of 4 animals for each dose and each experiment in the absence or presence of AG (50 mg/kg, ip, starting 24 h before challenge and daily...
Tipo: Info:eu-repo/semantics/other Palavras-chave: Nitric oxide; Sepsis; Experimental model; Bacterial infections; Escherichia coli; Bacteroides fragilis.
Ano: 2007 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2007000300006
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Antagonism by hemoglobin of effects induced by L-arginine in neuromuscular preparations from rats BJMBR
Ambiel,C.R.; Alves-Do-Prado,Wilson.
Nitric oxide (NO)-synthase is present in diaphragm, phrenic nerve and vascular smooth muscle. It has been shown that the NO precursor L-arginine (L-Arg) at the presynaptic level increases the amplitude of muscular contraction (AMC) and induces tetanic fade when the muscle is indirectly stimulated at low and high frequencies, respectively. However, the precursor in muscle reduces AMC and maximal tetanic fade when the preparations are stimulated directly. In the present study the importance of NO synthesized in different tissues for the L-Arg-induced neuromuscular effects was investigated. Hemoglobin (50 nM) did not produce any neuromuscular effect, but antagonized the increase in AMC and tetanic fade induced by L-Arg (9.4 mM) in rat phrenic nerve-diaphragm...
Tipo: Info:eu-repo/semantics/other Palavras-chave: Skeletal muscle; Nitric oxide; Tetanic fade; L-arginine; D-arginine; Hemoglobin.
Ano: 2001 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2001000400017
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Anticonvulsant and proconvulsant roles of nitric oxide in experimental epilepsy models BJMBR
Del-Bel,E.A.; Oliveira,P.R.; Oliveira,J.A.C.; Mishra,P.K.; Jobe,P.C.; Garcia-Cairasco,N..
The effect of acute (120 mg/kg) and chronic (25 mg/kg, twice a day, for 4 days) intraperitonial injection of the nitric oxide (NO) synthase (NOS) inhibitor NG-nitro-L-arginine (L-NOARG) was evaluated on seizure induction by drugs such as pilocarpine and pentylenetetrazole (PTZ) and by sound stimulation of audiogenic seizure-resistant (R) and audiogenic seizure-susceptible (S) rats. Seizures were elicited by a subconvulsant dose of pilocarpine (100 mg/kg) only after NOS inhibition. NOS inhibition also simultaneously potentiated the severity of PTZ-induced limbic seizures (60 mg/kg) and protected against PTZ-induced tonic seizures (80 mg/kg). The audiogenic seizure susceptibility of S or R rats did not change after similar treatments. In conclusion,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Experimental epilepsy; Seizures; Forebrain; Brainstem; Pilocarpine; Pentylenetetrazol; Audiogenic seizures; Genetically epilepsy-prone rats; GEPR; Nitric oxide.
Ano: 1997 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1997000800010
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Antigenic stimulation is more efficient than LPS in inducing nitric oxide production by human mononuclear cells on the in vitro granuloma reaction in schistosomiasis BJMBR
Oliveira,D.M.; Silva-Teixeira,D.N.; Araújo-Filho,R.; Goes,A.M..
Nitric oxide (NO) is an extremely important and versatile messenger in biological systems. It has been identified as a cytotoxic factor in the immune system, presenting anti- or pro-inflammatory properties under different circumstances. In murine monocytes and macrophages, stimuli by cytokines or lipopolysaccharide (LPS) are necessary for inducing the immunologic isoform of the enzyme responsible for the high-output production of NO, nitric oxide synthase (iNOS). With respect to human cells, however, LPS seems not to stimulate NO production in the same way. Addressing this issue, we demonstrate here that peripheral blood mononuclear cells (PBMC) obtained from schistosomiasis-infected patients and cultivated with parasite antigens in the in vitro granuloma...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Nitric oxide; LPS; Schistosomiasis infection; In vitro granuloma.
Ano: 1999 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1999001100015
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Antimicrobial peptides and nitric oxide production by neutrophils from periodontitis subjects BJMBR
Mariano,F.S.; Campanelli,A.P.; Nociti Jr.,F.H.; Mattos-Graner,R.O.; Gonçalves,R.B..
Neutrophils play an important role in periodontitis by producing nitric oxide (NO) and antimicrobial peptides, molecules with microbicidal activity via oxygen-dependent and -independent mechanisms, respectively. It is unknown whether variation in the production of antimicrobial peptides such as LL-37, human neutrophil peptides (HNP) 1-3, and NO by neutrophils influences the pathogenesis of periodontal diseases. We compared the production of these peptides and NO by lipopolysaccharide (LPS)-stimulated neutrophils isolated from healthy subjects and from patients with periodontitis. Peripheral blood neutrophils were cultured with or without Aggregatibacter actinomycetemcomitans-LPS (Aa-LPS), Porphyromonas gingivalis-LPS (Pg-LPS) and Escherichia coli-LPS...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Antimicrobial peptides; Nitric oxide; Neutrophils; Periodontitis; Innate immunity.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2012001100004
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Antinociceptive effect on mice of the hydroalcoholic fraction and (-) epicatechin obtained from Combretum leprosum Mart & Eich BJMBR
Lopes,L.S.; Marques,R.B.; Pereira,S.S.; Ayres,M.C.C.; Chaves,M.H.; Cavalheiro,A.J.; Vieira Júnior,G.M.; Almeida,F.R.C..
Previous studies on Combretum leprosum, a tree growing in the Northeastern states of Brazil, have shown antinociceptive effects of the ethanol extract of its leaves and bark, but studies examining its constituents are rare. The objective of this study was to evaluate the antinociceptive effect of the hydroalcoholic fraction (HF) of one of its constituents, the flavonoid (-) epicatechin (EPI), administered orally to mice (20-30 g) in models of chemical nociception, and the possible mechanisms involved. Different doses of HF (62.5 to 500 mg/kg) and EPI (12.5 to 50 mg/kg) were evaluated in models of abdominal writhing, glutamate, capsaicin, and formalin in animals pretreated with different antagonists: naloxone, ondansetron, yohimbine, ketanserin, pindolol,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Combretum leprosum; Epicatechin; Antinociceptive; Serotonin; Nitric oxide.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2010001200008
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Anxiolytic effect of methylene blue microinjected into the dorsal periaqueductal gray matter BJMBR
de-Oliveira,R.W.; Guimarães,F.S..
The dorsal periaqueductal gray (DPAG) has been implicated in the behavioral and autonomic expression of defensive reactions. Several results suggest that, along with GABA, glutamate and serotonin, nitric oxide (NO) may play a role in defense reactions mediated by this region. To further investigate this possibility we microinjected methylene blue (MB; 10, 30 or 100 nmol/0.5 µl) into the DPAG of rats submitted to the elevated plus-maze test, an animal model of anxiety. MB has been used as an inhibitor of soluble guanylate cyclase (sGC) to demonstrate cGMP-mediated processes, and there is evidence that NO may exert its biological effects by binding to the heme part of guanylate cyclase, causing an increase in cGMP levels. The results showed that MB (30 nmol)...
Tipo: Info:eu-repo/semantics/other Palavras-chave: Anxiety; Elevated plus-maze; Nitric oxide; Animal model.
Ano: 1999 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1999001200012
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Arginine induces GH gene expression by activating NOS/NO signaling in rat isolated hemi-pituitaries BJMBR
Olinto,S.C.F.; Adrião,M.G.; Castro-Barbosa,T.; Goulart-Silva,F.; Nunes,M.T..
The amino acid arginine (Arg) is a recognized secretagogue of growth hormone (GH), and has been shown to induce GH gene expression. Arg is the natural precursor of nitric oxide (NO), which is known to mediate many of the effects of Arg, such as GH secretion. Arg was also shown to increase calcium influx in pituitary cells, which might contribute to its effects on GH secretion. Although the mechanisms involved in the effects of Arg on GH secretion are well established, little is known about them regarding the control of GH gene expression. We investigated whether the NO pathway and/or calcium are involved in the effects of Arg on GH gene expression in rat isolated pituitaries. To this end, pituitaries from approximately 170 male Wistar rats (~250 g) were...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Arginine; GH mRNA expression; Nitric oxide; Calcium (Ca2+); Cyclic guanosine monophosphate.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2012001100011
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Arginine metabolism in uricotelic species - doi: 10.4025/actascianimsci.v32i4.10990 Animal Sciences
Fernandes, Jovanir Inês Müller; Universidade Federal do Paraná; Murakami, Alice Eiko; UEM.
Due to the lack of a complete urea cycle, uricotelic species, such as broilers, are not able to synthesize de novo arginine (Arg), thus depending exclusively on dietary Arg. High levels of dietary lysine (Lys) increase the demand for Arg because of the antagonistic relationship between these amino acids. The Arg-Lys antagonism promotes an expressive increase in the renal Arg activity and consequently induces the degradation of Arg and the decrease in the activity of glycine amidinotransferase, an enzyme that uses Arg in the synthesis of muscle creatin. Arg is considered an important modulator of immunological and physiological processes. The degradation of Arg produces ornithine, a precursor of polyamines that are key to cell division, DNA synthesis, and...
Palavras-chave: Carbamoyl phosphatase synthetase; Creatine; Immune system; Nitric oxide; Polyamines; Urea cycle carbamoyl phosphatase synthetase; Creatine; Immune system; Nitric oxide; Polyamines; Urea cycle.
Ano: 2010 URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/10990
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Atropine and ODQ antagonize tetanic fade induced by L-arginine in cats BJMBR
Cruciol-Souza,J.M.; Alves-Do-Prado,W..
Although it has been demonstrated that nitric oxide (NO) released from sodium nitrite induces tetanic fade in the cat neuromuscular preparations, the effect of L-arginine on tetanic fade and its origin induced by NO have not been studied in these preparations. Furthermore, atropine reduces tetanic fade induced by several cholinergic and anticholinergic drugs in these preparations, whose mechanism is suggested to be mediated by the interaction of acetylcholine with inhibitory presynaptic muscarinic receptors. The present study was conducted in cats to determine the effects of L-arginine alone or after pretreatment with atropine or 1H-[1,2,4]oxadiazole [4,3-a]quinoxalin-1-one (ODQ) on neuromuscular preparations indirectly stimulated at high frequency. Drugs...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Atropine; Tetanic fade; Skeletal muscle; Nitric oxide; Muscarinic receptors.
Ano: 1999 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1999001000015
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Bi-directional actions of estrogen on the renin-angiotensin system BJMBR
Brosnihan,K.B.; Senanayake,P.S.; Li,P.; Ferrario,C.M..
Estrogen stimulates the renin-angiotensin system by augmenting both tissue and circulating levels of angiotensinogen and renin. We show, however, that angiotensin converting enzyme (ACE) activity in the circulation and in tissues is reduced in two animal models of postmenopausal chronic hormone replacement. We observed a reduction of ACE activity in association with a significant increase in plasma angiotensin I (Ang I) and hyperreninemia in ovariectomized monkeys treated with Premarin (conjugated equine estrogen) replacement for 30 months. Plasma angiotensin II (Ang II) levels were not increased in monkeys treated with estrogen, suggesting that the decrease in ACE curtailed the formation of the peptide. The Ang II/Ang I ratio, an in vivo index of ACE...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Renin; Angiotensin converting enzyme; Angiotensin peptides; Angiotensin receptors; Bradykinin; Nitric oxide; Kinins; Vasodilation; Hormone replacement.
Ano: 1999 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1999000400001
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