okadaic acid/infarkt

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Okadaic acid and anisomycin are protective and stimulate the SAPK/JNK pathway.

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We report that okadaic acid (OA), a known inhibitor of Ser/Thr phosphatases, protects pig myocardium against ischemic injury in an in vivo model and stimulates the activities of stress-activated protein kinases/c-Jun N-terminal kinases (SAPKs/JNKs). When OA was directly infused into the subsequently

Kinases and phosphatases in ischaemic preconditioning: a re-evaluation.

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Activation of several protein kinases occurs during myocardial ischaemia and during subsequent reperfusion. In contrast to the intensive investigation into the significance of kinase activation in cardioprotection, relatively little is known about the role of the phosphatases in this regard. The aim

PP2A regulates SCF-induced cardiac stem cell migration through interaction with p38 MAPK.

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OBJECTIVE Previous studies have shown that stem cell factor (SCF) induces the migration of cardiac stem cells (CSCs) and helps to repair myocardial infarctions. Earlier studies on the migration mechanism only focused on the activation of kinases; here, we aimed to explore the functional role of

C1q/tumor necrosis factor-related protein-3 enhances the contractility of cardiomyocyte by increasing calcium sensitivity.

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C1q/tumor necrosis factor-related protein-3 (CTRP3) is an adipokine that protects against myocardial infarction-induced cardiac dysfunction through its pro-angiogenic, anti-apoptotic, and anti-fibrotic effects. However, whether CTRP3 can directly affect the systolic and diastolic function of

PP2A ligand ITH12246 protects against memory impairment and focal cerebral ischemia in mice.

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ITH12246 (ethyl 5-amino-2-methyl-6,7,8,9-tetrahydrobenzo[b][1,8]naphthyridine-3-carboxylate) is a 1,8-naphthyridine described to feature an interesting neuroprotective profile in in vitro models of Alzheimer's disease. These effects were proposed to be due in part to a regulatory action on protein

Role of protein kinase C-alpha in activation of ecto-5'-nucleotidase in the preconditioned canine myocardium.

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We have reported that activation of protein kinase C (PKC) increases ecto-5'-nucleotidase activity, which may contribute to the infarct size-limiting effect of ischemic preconditioning. Since we have reported that Ca(2+)- and phospholipid-sensitive PKC is activated due to ischemic preconditioning,

Acetylcholine inhibits the hypoxia-induced reduction of connexin43 protein in rat cardiomyocytes.

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In a recent study, we demonstrated that vagal stimulation increases the survival of rats with myocardial infarction by inhibiting lethal arrhythmia through regulation of connexin43 (Cx43). However, the precise mechanisms for this effect remain to be elucidated. To investigate these mechanisms and

Diminished basal phosphorylation level of phospholamban in the postinfarction remodeled rat ventricle: role of beta-adrenergic pathway, G(i) protein, phosphodiesterase, and phosphatases.

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Three weeks after myocardial infarction (MI) in the rat, remodeled hypertrophy of noninfarcted myocardium is at its maximum and the heart is in a compensated stage with no evidence of heart failure. Our hemodynamic measurements at this stage showed a slight but insignificant decrease of +dP/dt but a

Pyruvate restores β-adrenergic sensitivity of L-type Ca(2+) channels in failing rat heart: role of protein phosphatase.

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Oxidative stress plays a major role in the pathogenesis of heart failure, where the contractile response to β-adrenergic stimulation is profoundly depressed. This condition involves L-type Ca(2+) channels, but the mechanisms underlying their impaired adrenergic regulation are unclear. Thus the

Upregulation of protein phosphatase 2A and NR3A-pleiotropic effect of simvastatin on ischemic stroke rats.

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Ca(2+) influxes are regulated by the functional state of N-methyl-D-aspartate receptors (NMDARs). Dephosphorylation of NMDARs subunits decreases Ca(2+) influxes. NR3, a novel subunit of NMDARs, also decreases Ca(2+) influxes by forming new NMDARs with NR1 and NR2. It is meaningful to uncover whether

Hypoxia/reoxygenation stimulates Jun kinase activity through redox signaling in cardiac myocytes.

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Hypoxia and reoxygenation are principal components of myocardial ischemia and reperfusion and have distinctive effects on the tissue. Both conditions have been associated with inflammation, necrosis, apoptosis, and myocardial infarction. Using a cell culture model of ischemia and reperfusion in

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