Beta Adrenoreceptors
Mostrando 1-7 de 7 artigos, teses e dissertações.
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1. Sensibilidade adrenergica de atrios direitos isolados de ratos normo ou hiperlipidemicos sedentarios ou submetidos a natação / Right atria sensitivity from normo or hiperlipidemic rats, sedentary or submitted to swimming sessios
Lipídios provenientes da dieta têm um importante efeito no sistema de sinalização transmembrana presente nas células cardíacas. Um vez ingeridos em excesso ocorre aumento no conteúdo de colesterol na membrana da célula cardíaca o qual afeta a atividade da adelilil ciclase ligada ao receptor ? e conseqüentemente as respostas cronotrópicas e inotró
Publicado em: 2005
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2. beta-Adrenoreceptor antagonists in essential tremor.
Three different beta-adrenoreceptor antagonists--propranolol, sotalol, and atenolol--were compared in a double-blind study with placebo in nine patients with essential tremor. All three drugs produced an equal reduction in standing pulse rate but atenolol was less effective in reducing tremor than propranolol and sotalol. These results suggest that the reduc
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3. Beta adrenoreceptor subtype cross regulation in the human heart.
OBJECTIVES--To find out in a prospective study whether beta 1 blocker treatment causes selective beta 2 adrenoreceptor sensitisation, and to find whether such sensitisation is confined to the heart. DESIGN--A placebo controlled cross over study of two weeks of selective beta 1 blocker treatment with 10 mg of bisoprolol daily. SUBJECTS--Six healthy volunteers
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4. Effects of timolol and atenolol on benign essential tremor: placebo-controlled studies based on quantitative tremor recording.
Two different beta-adrenoreceptor antagonists, atenolol and timolol, were separately compared with a placebo in the suppression of essential tremor. In two-week single-blind placebo-controlled studies with cross-over, timolol (5 mg twice daily) and atenolol (100 mg once daily) produced an equal reduction in sitting heart rate and sitting blood pressure. Timo
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5. Chronic nonocclusive coronary artery constriction in rats. Beta-adrenoceptor signal transduction and ventricular failure.
To determine the effects of chronic coronary artery constriction on the relationship between cardiac function and regulation of beta-adrenoceptor signal transduction, the left main coronary artery was narrowed in rats and the animals were killed 5 mo later. An average reduction in coronary luminal diameter of 44% was obtained and this change resulted in an i
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6. Alpha 2 adrenergic agonists stimulate Na+-H+ antiport activity in the rabbit renal proximal tubule.
The role of adrenergic agents in augmenting proximal tubular salt and water flux, was studied in a preparation of freshly isolated rabbit renal proximal tubular cells in suspension. Norepinephrine (NE, 10(-5) M) increased sodium influx (JNa) 60 +/- 5% above control value. The alpha adrenergic antagonist, phentolamine (10(-5) M), inhibited the NE-induced enha
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7. Direct observations of responses of mesenteric microcirculation of the rat to circulating noradrenaline.
The responses of mesenteric microcirculation of the rat to circulating noradrenaline were studied by in vivo microscopy, using a photo-electric device placed on a television monitor to measure changes in diameter of individual vessels. Blood flow was measured in the anterior mesenteric artery with an electromagnetic flow transducer, mesenteric vascular condu