Consulta: subjectFacets:"Vasodilation"
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Data/hora: 04/06/2024 03:30:36

The effect of crude ethanol extract and fractions of Hyptidendron canum (Pohl ex Benth.) Harley on the hepatopancreas of Oreochromis niloticus L
Provedor de dados: 48
Autores: FIUZA,TATIANA S; SILVA,PAULO C; PAULA,JOSÉ R; TRESVENZOL,LEONICE M F; SABÓIA-MORAIS,SIMONE M T.
Hyptidendron canum (Pohl ex Benth.) Harley is a native tree of the Brazilian Savannah. The fish Oreochromis niloticus L. was used as an experimental model to determine the bioactivity of the crude ethanol extract as well as ethyl acetate, hexanic and chloroform fractions obtained from its leaves. The plant ethanol extract and fractions were administered to the fish orally with their feed. Twenty four hours later, the fish were sacrificed and their livers dissected, fixed in neutral formalin, embedded in paraffin and sectioned. Histological analyses were performed using Masson's trichrome and Haematoxylin-Eosin. Histochemical studies were performed using Feulgen, PAS (Periodic Acid Schiff) and PAS + salivary amylase and Sudan IV stain. The qualitative...
Tipo: Journal article
Palavras-chave: Fish; Nile tilapia; Savannah biome; Vasodilation.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602009000200003

Bioactivity of crude ethanol extract and fractions of Eugenia uniflora (Myrtaceae) in the hepatopancreas of Oreochromis niloticus L
Provedor de dados: 48
Autores: FIUZA,TATIANA S; SILVA,PAULO C; PAULA,JOSÉ R DE; TRESVENZOL,LEONICE M F; SABÓIA-MORAIS,SIMONE M T.
This study evaluates the bioactivity of the crude ethanol extract and ethyl acetate, hexane and chloroform fractions obtained from Eugenia uniflora leaves using the hepatopancreas of Oreochromis niloticus L. as an experimental model. The ethanol extract and fractions were administered to the fish orally with their feed. Twenty-four hours later, the fish were sacrificed and their livers dissected, fixed in neutral formalin, embedded in paraffin and sectioned. Histological analyses were performed using Masson's trichrome and Haematoxylin-Eosin. Histochemical studies were performed using Feulgen, PAS (Periodic Acid Schiff) and PAS + salivary amylase and Sudan IV stain. The qualitative analysis of the material showed that the crude extract and the ethyl,...
Tipo: Journal article
Palavras-chave: Fish; Medicinal plants; Vasodilation.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602009000400002

Endothelial mediators of 17ß-estradiol-induced coronary vasodilation in the isolated rat heart
Provedor de dados: 56
Autores: Santos,R.L.; Abreu,G.R.; Bissoli,N.S.; Moysés,M.R.
The present study was designed to determine relaxation in response to 17ß-estradiol by isolated perfused hearts from intact normotensive male and female rats as well as the contribution of endothelium and its relaxing factors to this action. Baseline coronary perfusion pressure was determined and the vasoactive effects of 17ß-estradiol (10 µM) were assessed by in bolus administration before and after endothelium denudation by infusion of 0.25 µM sodium deoxycholate or perfusion with 100 µM L-NAME, 2.8 µM indomethacin, 0.75 µM clotrimazole, 100 µM L-NAME plus 2.8 µM indomethacin, and 100 µM L-NAME plus 0.75 µM clotrimazole. Baseline coronary perfusion pressure differed significantly between males (84 ± 2 mmHg, N = 61) and females (102 ± 2 mmHg, N = 61)....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Estrogen; Vasodilation; Endothelium-derived relaxing factors; Coronary arteries.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2004000400014

Bi-directional actions of estrogen on the renin-angiotensin system
Provedor de dados: 56
Autores: 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

Deficiency of sex hormones does not affect 17-ß-estradiol-induced coronary vasodilation in the isolated rat heart
Provedor de dados: 56
Autores: Santos,R.L.; Lima,J.T.; Rouver,W.N.; Moysés,M.R.
The relaxation of coronary arteries by estrogens in the coronary vascular beds of naive and hypertensive rats has been well described. However, little is known about this action in gonadectomized rats. We investigated the effect of 17-ß-estradiol (E2) in coronary arteries from gonadectomized rats, as well as the contributions of endothelium-derived factors and potassium channels. Eight-week-old female and male Wistar rats weighing 220-300 g were divided into sham-operated and gonadectomized groups (n=9−12 animals per group). The baseline coronary perfusion pressure (CPP) was determined, and the vasoactive effects of 10 μM E2 were assessed by bolus administration before and after endothelium denudation or by perfusion with NG-nitro-L-arginine methyl ester...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gonadectomy; Estrogen; Vasodilation; Coronary arteries.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2016000500603

Effects of diet and exercise training on neurovascular control during mental stress in obese women
Provedor de dados: 56
Autores: Tonacio,A.C.; Trombetta,I.C.; Rondon,M.U.P.B.; Batalha,L.T.; Kuniyoshi,F.H.S.; Laterza,M.C.; Suzuki,P.H.; Gowdak,M.M.G.; Barretto,A.C.P.; Halpern,A.; Villares,S.M.F.; Negrão,C.E.
Since neurovascular control is altered in obese subjects, we hypothesized that weight loss by diet (D) or diet plus exercise training (D + ET) would improve neurovascular control during mental stress in obese women. In a study with a dietary reduction of 600 kcal/day with or without exercise training for 4 months, 53 obese women were subdivided in D (N = 22, 33 ± 1 years, BMI 34 ± 1 kg/m²), D + ET (N = 22, 33 ± 1 years, BMI 33 ± 1 kg/m²), and nonadherent (NA, N = 9, 35 ± 2 years, BMI 33 ± 1 kg/m²) groups. Muscle sympathetic nerve activity (MSNA) was measured by microneurography and forearm blood flow by venous occlusion plethysmography. Mental stress was elicited by a 3-min Stroop color word test. Weight loss was similar between D and D + ET groups (87 ± 2...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vasodilation; Sympathetic nervous system; Weight loss.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2006000100006

Ionic radiocontrast inhibits endothelium-dependent vasodilation of the canine renal artery in vitro: possible mechanism of renal failure following contrast medium infusion
Provedor de dados: 56
Autores: Discigil,B.; Evora,P.R.B.; Pearson,P.J.; Viaro,F.; Rodrigues,A.J.; Schaff,H.V.
To determine if radiocontrast impairs vascular relaxation of the renal artery, segments (4-5 mm in length) of canine renal artery were suspended in vitro in organ chambers to measure isometric force (95% O2/5% CO2, at 37ºC). Arterial segments with and without endothelium were placed at the optimal point of their length-tension relation and incubated with 10 µM indomethacin to prevent synthesis of endogenous prostanoids. The presence of nonionic radiocontrast (iohexol, Omnipaque 350, 1 ml in 25 ml control solution, 4% (v/v)) did not alter endothelium-dependent relaxation to acetylcholine in rings precontracted with both norepinephrine and prostaglandin F2alpha (N = 6). When the rings were precontracted with prostaglandin F2alpha, the presence of ionic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Radiocontrast; Renal failure; Nitric oxide; Vasodilation.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2004000200014

Blockade of the action of nitric oxide in human septic shock increases systemic vascular resistance and has detrimental effects on pulmonary function after a short infusion of methylene blue
Provedor de dados: 56
Autores: Weingartner,R.; Oliveira,E.; Oliveira,E.S.; Sant'Anna,U.L.; Oliveira,R.P.; Azambuja,L.A.; Friedman,G.
To investigate the role of nitric oxide in human sepsis, ten patients with severe septic shock requiring vasoactive drug therapy and mechanical ventilation were enrolled in a prospective, open, non-randomized clinical trial to study the acute effects of methylene blue, an inhibitor of guanylate cyclase. Hemodynamic and metabolic variables were measured before and 20, 40, 60, and 120 min after the start of a 1-h intravenous infusion of 4 mg/kg of methylene blue. Methylene blue administration caused a progressive increase in mean arterial pressure (60 [55-70] to 70 [65-100] mmHg, median [25-75th percentiles]; P&amp;lt;0.05), systemic vascular resistance index (649 [479-1084] to 1066 [585-1356] dyne s-1 cm-5 m-2; P&amp;lt;0.05) and the left ventricular stroke...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vasodilation; Myocardial depression; Septic shock; Methylene blue; Nitric oxide; Guanylate cyclase.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1999001200009