ryanodine/stroke

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Identification of variants of the ryanodine receptor type 1 in patients with exertional heat stroke and positive response to the malignant hyperthermia in vitro contracture test.

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Caffeine-induced contraction in arteries from stroke-prone spontaneously hypertensive rats.

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Differences in caffeine-induced contraction in smooth muscle of resistance vessels from stroke-prone spontaneously hypertensive rats (SHRSP) and Wistar Kyoto rats (WKY) were investigated by using mesenteric artery preparations. The contraction induced by caffeine (10 mM) was greater in SHRSP

Evidence for related myopathies in exertional heat stroke and malignant hyperthermia.

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Malignant hyperthermia may be a human stress syndrome, of which heat stroke is one manifestation. Two men in military service who had episodes of exertional heat stroke, and their immediate family members, were tested for susceptibility to malignant hyperthermia by in-vitro contracture tests on

A noninvasive investigation of muscle energetics supports similarities between exertional heat stroke and malignant hyperthermia.

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Exertional heat stroke (EHS) is usually triggered by strenuous exercise performed under hot and humid environmental conditions. Although the pathogenesis of an EHS episode differs from that of a clinical malignant hyperthermia (MH) crisis, both conditions share some similarities in symptoms, such as

Decreased activity of the sodium-calcium exchanger in tail artery of stroke-prone spontaneously hypertensive rats.

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The ability of the Na-Ca exchanger to modify vascular relaxation was studied in rings isolated from tail arteries of stroke-prone spontaneously hypertensive rats (SHRSP) and normotensive Wistar-Kyoto rats (WKY). The arteries were contracted with norepinephrine (NE) 1 microM and after stabilization

Calsequestrin-1: a new candidate gene for malignant hyperthermia and exertional/environmental heat stroke.

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Malignant hyperthermia (MH) and exertional/environmental heat stroke (EHS) in humans present as similar life threatening crises triggered by volatile anaesthetics and strenuous exercise and/or high temperature, respectively. Many families (70-80%) diagnosed with MH susceptibility (MHS), and a few

Overlapping Mechanisms of Exertional Heat Stroke and Malignant Hyperthermia: Evidence vs. Conjecture

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Exertional heat stroke (EHS) and malignant hyperthermia (MH) are life-threatening conditions, triggered by different environmental stimuli that share several clinical symptoms and pathophysiological features. EHS manifests during physical activity normally, but not always, in hot and humid

Increased expression of ryanodine receptor type-2 during atrial fibrillation by miR-106-25 cluster independent mechanism.

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Atrial fibrillation (AF), the most frequently encountered cardiac arrhythmia in the clinical setting and the foremost cause of stroke, results from a progressive decrease in atrial refractoriness. In addition, defective calcium signaling has been shown to play a central role in AF pathogenesis.

Abnormal response to ryanodine in oesophageal striated muscle of spontaneously hypertensive rats.

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The effects of ryanodine on twitch contraction and basal tension of oesophageal striated muscle were compared between preparations from stroke-prone spontaneously hypertensive rats (SHRSP) and normotensive Wistar Kyoto rats (WKY). Ryanodine (3 x 10(-7) M) augmented the twitch contraction in WKY

Role of the ryanodine receptor in ischemic brain damage--localized reduction of ryanodine receptor binding during ischemia in hippocampus CA1.

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1. The ryanodine receptor has recently been shown to play a pivotal role in the regulation of intracellular Ca2+ concentration via Ca(2+)-induced Ca2+ release (CICR). Effects of ischemia on CICR in the brain tissue, however, remain largely unknown since only a few reports have been published on this

Ryanodine and left ventricular function in intact dogs: dissociation of force-based and velocity-based indexes.

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After anesthesia and autonomic blockade, nine dogs chronically instrumented with left ventricular (LV) micromanometers and piezoelectric dimension crystals were studied before and after the intravenous administration of 4 micrograms/kg ryanodine, a specific inhibitor of the sarcoplasmic reticulum

Identification of malignant hyperthermia-susceptible ryanodine receptor type 1 gene (RYR1) mutations in a child who died in a car after exposure to a high environmental temperature.

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Malignant hyperthermia (MH) is a genetic disorder of skeletal muscle in susceptible individuals that is triggered by exposure to anesthetic agents, and can cause death. Mutations in the ryanodine receptor type 1 gene (RYR1) are associated with MH-susceptibility. MH is also triggered in susceptible

Hypothesis: exertional heat stroke-induced myopathy and genetically inherited malignant hyperthermia represent the same disorder, the human stress syndrome.

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Exertional heat stroke is usually experienced as a result of a prolonged and intensive exercise. It is a life-threatening condition that is characterized by an increase in core body temperature and rhabdomyolysis. The associated hyperkalemia and metabolic acidosis may lead to an acute renal,

Hypothermia reduces calcium entry via the N-methyl-D-aspartate and ryanodine receptors in cultured hippocampal neurons.

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Hypothermia is a powerful neuroprotective method when induced following cardiac arrest, stroke, and traumatic brain injury. The physiological effects of hypothermia are multifaceted and therefore a better knowledge of its therapeutic targets will be central to developing innovative combination

Cardiac ryanodine receptor in metabolic syndrome: is JTV519 (K201) future therapy?

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Metabolic syndrome is characterized by a combination of obesity, hypertension, insulin resistance, dyslipidemia, and impaired glucose tolerance. This multifaceted syndrome is often accompanied by a hyperdynamic circulatory state characterized by increased blood pressure, total blood volume, cardiac

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