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Hypoxia-induced cardiac hypertrophy in rabbits treated with verapamil and nifedipine.

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Young rabbits were exposed, eight at a time, to 310 h of hypoxia (O2 at 70-80 torr), at atmospheric pressure. The animals were injected with 1 mg kg-1 nifedipine (F) or 5 mg kg-1 verapamil (V) or an equivalent volume of the vehicle (H) (Cremophor EL), i.p. twice a day. A fourth group (N), also

Melatonin protects against chronic intermittent hypoxia-induced cardiac hypertrophy by modulating autophagy through the 5' adenosine monophosphate-activated protein kinase pathway.

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Obstructive sleep apnea syndrome (OSAS) is usually associated with multiple cardiovascular disorders, including myocardial hypertrophy. Melatonin protects the heart from damaging conditions. However, whether melatonin alleviates heart damage induced by chronic intermittent hypoxia (CIH) is unknown.

Activation of hypoxia-inducible factor-2 in adipocytes results in pathological cardiac hypertrophy.

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BACKGROUND Obesity can cause structural and functional abnormalities of the heart via complex but largely undefined mechanisms. Emerging evidence has shown that obesity results in reduced oxygen concentrations, or hypoxia, in adipose tissue. We hypothesized that the adipocyte hypoxia-signaling

Eccentric cardiac hypertrophy was induced by long-term intermittent hypoxia in rats.

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It is unclear whether cardiac hypertrophy and hypertrophy-related pathways will be induced by long-term intermittent hypoxia. Thirty-six Sprague-Dawley rats were randomly assigned into three groups: normoxia, and long-term intermittent hypoxia (12% O(2), 8 h per day) for 4 weeks (4WLTIH) or for 8

Aryl hydrocarbon receptor null mice develop cardiac hypertrophy and increased hypoxia-inducible factor-1alpha in the absence of cardiac hypoxia.

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The aryl hydrocarbon receptor (AhR) is a member of the basic helix loop helix PAS (Per-ARNT-SIM) transcription family, which also includes hypoxiainducible factor-1alpha (HIF-1alpha) and its common dimerization partner AhR nuclear translocator (ARNT). Following ligand activation or hypoxia, AhR or

Chronic intermittent hypoxia induces cardiac hypertrophy by impairing autophagy through the adenosine 5'-monophosphate-activated protein kinase pathway.

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Autophagy is tightly regulated to maintain cardiac homeostasis. Impaired autophagy is closely associated with pathological cardiac hypertrophy. However, the relationship between autophagy and cardiac hypertrophy induced by chronic intermittent hypoxia (CIH) is not known. In the present study, we

Reduction by beta-adrenoceptor blockade of hypoxia-induced right heart hypertrophy in the rat.

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1. The study was undertaken to assess the role of beta-adrenoceptors in the induction of compensatory cardiac hypertrophy in an in vivo model. 2. In the rat, exposure to severe hypoxia (6% inspired oxygen for 8 h day) caused a 51% increase in right heart weight and a 75% increase in haematocrit. 3.

Hypoxia-Induced Mitogenic Factor Promotes Cardiac Hypertrophy via Calcium-Dependent and Hypoxia-Inducible Factor-1α Mechanisms.

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HIMF (hypoxia-induced mitogenic factor/found in inflammatory zone 1/resistin like α) is a secretory and cytokine-like protein and serves as a critical stimulator of hypoxia-induced pulmonary hypertension. With a role for HIMF in heart disease unknown, we explored the possible roles for HIMF in

The PPARbeta/delta agonist GW0742 relaxes pulmonary vessels and limits right heart hypertrophy in rats with hypoxia-induced pulmonary hypertension.

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BACKGROUND Pulmonary vascular diseases are increasingly recognised as important clinical conditions. Pulmonary hypertension associated with a range of aetiologies is difficult to treat and associated with progressive morbidity and mortality. Current therapies for pulmonary hypertension include

Carvedilol prevents cardiac hypertrophy and overexpression of hypoxia-inducible factor-1alpha and vascular endothelial growth factor in pressure-overloaded rat heart.

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The use of beta-blockers has emerged as a beneficial treatment for cardiac hypertrophy. Hypoxia-inducible factor-1alpha (HIF-1alpha) is tightly regulated in the ventricular myocardium. However, the expression of HIF-1alpha in cardiac hypertrophy due to pressure overload and after treatment with

Cardiac hypertrophy in chronically anemic fetal sheep: Increased vascularization is associated with increased myocardial expression of vascular endothelial growth factor and hypoxia-inducible factor 1.

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OBJECTIVE Our purpose was to determine whether the increase in fetal cardiac mass and cardiac output in chronic anemia is accompanied by changes in capillary density or size or changes in levels of vascular endothelial growth factor and hypoxia-inducible factor 1, a basic helix-loop-helix

Chrysanthemum morifolium extract improves hypertension-induced cardiac hypertrophy in rats by reduction of blood pressure and inhibition of myocardial hypoxia inducible factor-1alpha expression.

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BACKGROUND Chrysanthemum morifolium Ramat. (Asteraceae) extract (CME) possesses a vasodilator effect in vitro. However, the use of polyphenol-rich CME in the treatment of hypertension-induced cardiac hypertrophy has not been reported. OBJECTIVE We investigated the effect of polyphenol-rich CME on

HIMF (Hypoxia-Induced Mitogenic Factor)-IL (Interleukin)-6 Signaling Mediates Cardiomyocyte-Fibroblast Crosstalk to Promote Cardiac Hypertrophy and Fibrosis.

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HIMF (hypoxia-induced mitogenic factor) is a secreted proinflammatory cytokine with a critical role in cardiac hypertrophy development. Loss of HIMF attenuates transverse aortic constriction-induced cardiac hypertrophy and fibrosis, but the underlying mechanisms are unknown. We show that IL

Apigenin ameliorates hypertension-induced cardiac hypertrophy and down-regulates cardiac hypoxia inducible factor-lα in rats.

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Apigenin is a natural flavonoid compound that can inhibit hypoxia-inducible factor (HIF)-1α expression in cultured tumor cells under hypoxic conditions. Hypertension-induced cardiac hypertrophy is always accompanied by abnormal myocardial glucolipid metabolism due to an increase of HIF-1α. However,

[Various characteristics of the contractile function of the heart in cardiac hypertrophy during readaptation after adaptation of the body to high-altitude hypoxia].

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Hemodynamics, coronary circulation, electric activity and morphologic changes of the heart were investigated in 150 rabbits after their extended adaptation to high altitude hypoxia and during readaptation. It was found that changes in the contractile function of the hypertrophied heart, which

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Herbal & Natural Medicine

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