5 hydroxytryptamine/hypoxia

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Release of 5-hydroxytryptamine by hypoxia from epithelioid cells of chicken thoracic aorta.

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Epithelioid cells in the chicken thoracic aorta are shown to contain 5-hydroxytryptamine (5-HT) in immunocytochemical studies. To determine whether these cells act as chemoreceptors, as do type I cells of the carotid body, we examined the effects of hypoxia and acidosis on the release of 5-HT from

Changes of 5-hydroxytryptamine release by different glucose concentration from hippocampal slices exposed to hypoxia.

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We have previously reported that the spontaneous release of [3H]5-hydroxytryptamine(5-HT) was markedly decreased by hypoxic insult in rat hippocampal slices. In the present study, the effect of glucose on 5-HT release was examined. Fractional release of [3H]5-HT was measured from an incubation

Effects of nitroglycerin, dipyridamole, nifedipine, verapamil and diltiazem on canine coronary arterial rings contracted with 5-hydroxytryptamine and anoxia.

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Anoxia has been shown to potentiate the constrictor effects of 5-hydroxytryptamine (5HT) in isolated vascular tissue. In the present study, canine coronary arterial rings were incubated with various treatments and exposed to 5HT (4 X 10(-7) M) and anoxia (95% N2 and 5% CO2). Developed tension was

Potentiation of 5-hydroxytryptamine (5-HT) responses by a 5-HT uptake inhibitor in pulmonary and systemic vessels: effects of exposing rats to hypoxia.

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The aim was to determine whether uptake of 5-hydroxytryptamine (5-HT) by the 5-HT transporter (SERT) modulates contractile responses to 5-HT in rat pulmonary arteries and whether this modulation is altered by exposure of rats to chronic hypoxia (10% oxygen; 8 h/day; 5 days). The effects of the SERT

Overexpression of the 5-hydroxytryptamine transporter gene: effect on pulmonary hemodynamics and hypoxia-induced pulmonary hypertension.

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BACKGROUND Increased serotonin (5-hydroxytryptamine, 5-HT) transporter activity has been observed in human familial pulmonary hypertension. RESULTS We investigated pulmonary hemodynamics and the development of hypoxia-induced pulmonary hypertension and pulmonary vascular remodeling in mice

Imatinib attenuates hypoxia-induced pulmonary arterial hypertension pathology via reduction in 5-hydroxytryptamine through inhibition of tryptophan hydroxylase 1 expression.

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BACKGROUND Whether idiopathic, familial, or secondary to another disease, pulmonary arterial hypertension (PAH) is characterized by increased vascular tone, neointimal hyperplasia, medial hypertrophy, and adventitial fibrosis. Imatinib, a potent receptor tyrosine kinase inhibitor, reverses pulmonary

Hypoxia and response of human umbilical artery strips to 5-hydroxytryptamine: role of prostaglandin F2 alpha.

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1. This article examines the effects of hypoxia on the contractile response of isolated human umbilical artery strips to 5-hydroxytryptamine (5-HT). 2. Hypoxic conditions produce a large increase in the contractile response to 5-HT without a significant alteration of the sensitivity evaluated at the

Inhibitory effect of lidoflazine on contractions of isolated canine coronary arteries caused by norepinephrine, 5-hydroxytryptamine, high potassium, anoxia and ergonovine maleate.

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Experiments were performed on isolated coronary arteries to determine whether or not lidoflazine, an agent reported to be beneficial in the treatment of angina pectoris, is effective in antagonizing coronary vasoconstriction. Segments of canine circumflex and right coronary arteries were suspended

The effects of cinepazide on the content, biosynthesis and turnover of noradrenaline, dopamine and 5-hydroxytryptamine in the rat brain under room air and hypoxia.

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The effects of cinepazide, a vasodilator, on the content, biosynthesis and turnover of noradrenaline (NA), dopamine (DA) and 5-hydroxytryptamine (5-HT) in the rat brain were examined under room air and hypoxia (10% O2, 90% N2). Under room air, cinepazide had no significant effects on the content of

5-hydroxytryptamine induces vasoconstriction of the human umbilical artery: effects of hypoxia and nicorandil.

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Human umbilical arteries are known to be modulated by oxygen partial pressure. To further understand the underlying mechanisms, rings were suspended in organ chambers for the measurement of isometric force. The effects of 5-hydroxytryptamine (10(-9) to 10(-5) M) were first investigated before and

Changes in brain 5-hydroxytryptamine metabolism induced by hypobaric hypoxia.

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1. 5-hydroxytryptamine (5-HT) level was measured in hypothalamus, striatum and the rest of the brain of rats exposed to 1800, 5200 and 7000 m simulated altitudes. 2. Moderate hypobaric hypoxia failed to modify 5-HT level, whereas severe hypoxia reduced the amine level by about 30%. 3. Treatment with

[Effects of oxidized LDL, hypoxia, and 5-hydroxytryptamine on 5-HT2A receptor and intracellular free Ca2+ in cultured vascular smooth muscle cells].

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OBJECTIVE To investigate the mechanisms of this hyperreactivity, the effects of oxLDL, hypoxia, and 5-HT (the relative factors inducing arteriosclerosis) on 5-HT2A receptor, receptor gene expression and intracellular free Ca2+ were observed in cultured rat aortic smooth muscle cells

[Radiation-protective effect of 5-hydroxytryptamine and 5-methoxytryptamine in combination with short term hypoxia].

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Pulmonary venular responses to anoxia, 5-hydroxytryptamine and histamine.

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The role of serotonin (5-hydroxytryptamine) in the pulmonary arterial pressor response during acute hypoxia.

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