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catalase/hypoxia

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Galantamine administration reduces reactive astrogliosis and upregulates the anti-oxidant enzyme catalase in rats submitted to neonatal hypoxia ischemia.

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Neonatal hypoxia ischemia (HI) plays a role in the etiology of several neurological pathologies and causes severe sequelae. Acetylcholine is a neurotransmitter in the central nervous system and cholinesterase inhibitors have demonstrated a positive action over HI induced deficits. In order to

Decreasing cellular hydrogen peroxide with catalase mimics the effects of hypoxia on the sensitivity of the L-type Ca2+ channel to beta-adrenergic receptor stimulation in cardiac myocytes.

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In cardiac myocytes, hypoxia inhibits the basal L-type Ca2+ current (I(Ca-L)) and increases the sensitivity of I(Ca-L) to beta-adrenergic receptor stimulation. We investigated whether hydrogen peroxide (H2O2) is involved in the hypoxic response. Guinea pig ventricular myocytes were dialyzed with

Oxygen-producing catalase-based prodrug nanoparticles overcoming resistance in hypoxia-mediated chemo-photodynamic therapy

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Extreme hypoxia inside solid tumors is the primary barrier against the advance of chemotherapy and photodynamic therapy (PDT). To address this problem, a hybrid nano-enzyme prodrug system was developed to alleviate hypoxia as well as simultaneously sensitize chemo-photodynamic therapy. Lactobionic

Repression of hypoxia-reoxygenation injury in the catalase-overexpressing heart of transgenic mice.

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Hypoxia-reoxygenation injury results at least in part from reactive oxygen free radicals. Catalase is a major enzyme involved in detoxification of hydrogen peroxide. The activity of catalase per gram of tissue in the heart is very low, being only about 2% that of liver in rodents and humans, which

Targeted intracellular catalase delivery protects neonatal rat myocytes from hypoxia-reoxygenation and ischemia-reperfusion injury.

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Hypoxia followed by reoxygenation and ischemia reperfusion cause cell death in neonatal rat ventricular myocytes primarily through the generation of oxidative stress. Extracellular catalase has not been effective in reducing or eliminating ischemia reperfusion- or hypoxia-reoxygenation-induced cell

White shrimp Litopenaeus vannamei catalase: gene structure, expression and activity under hypoxia and reoxygenation.

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Catalase (EC 1.11.1.6) is an antioxidant enzyme involved in redox equilibrium, regulating hydrogen peroxide (H(2)O(2)) concentration, a harmful reactive oxygen species (ROS) that is produced during hypoxia. Hypoxia occurs commonly in aquatic environments and in shrimp farms. We studied the catalase

Developmental changes of erythrocyte catalase activity in rats exposed to acute hypoxia.

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The erythrocytes represent an important source of antioxidant capacity of the blood. Catalase (EC 1.11.1.6.) is one of the enzymatic components of their antioxidant defense system. The objective of this study was to follow erythrocyte catalase (CAT) in 7-, 15-, 21-, 35-, 60- and 90-day-old Wistar

Synthesis, cytotoxicity for mimics of catalase: inhibitors of lactate dehydrogenase and hypoxia inducible factor.

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Lactate dehydrogenase A (LDH-A) is a potentially important metabolic target for the inhibition of the highly activated glycolysis pathway in cancer cells. Two Mn(II) complexes with ligand containing di(pyridylmethyl) amine and pyrrol-ketone were used to attenuate the activity of LDH-A. The

Hypoxia-induced cell damage is reduced by mild hypothermia and postconditioning with catalase in-vitro: application of an enzyme based oxygen deficiency system.

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Mild hypothermia and pharmacological postconditioning are widespread therapeutical treatment options that positively influence the clinical outcome after tissue hypoxia. In the study presented, a two-enzyme based in-vitro oxygen deficiency model in combination with cultured HT-1080 fibrosarcoma

Effects of catalase and endothelin on anoxia-induced vasoconstriction of porcine basilar artery in vitro.

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OBJECTIVE To study whether anoxia-induced vasoconstriction was related to the release of endothelin (ET). METHODS Acute anoxia was induced by gassing the organ chamber with 95% N2 + 5% CO2. Changes in tension of porcine basilar arterial ring was recorded. RESULTS Anoxia-induced increases in tension

Ambient temperature of hypoxia: a differential study of liver catalase and cytochrome oxidase in guinea pig.

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The activities of liver catalase and cytochrome oxidase have been determined in sea-level and high-altitude native guinea pigs exposed to different ambient temperatures. The activities of both of these enzymatic systems have been found to increase as ambient temperature is reduced, and this occurs

Photosensitizer-crosslinked in-situ polymerization on catalase for tumor hypoxia modulation & enhanced photodynamic therapy.

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Tumor hypoxia is known to be one of critical factors that aggravate the tumor resistance to photodynamic therapy (PDT) in which oxygen is essential for tumor destruction. Herein, catalase, an enzyme to trigger hydrogen peroxide (H2O2) decomposition, is modified by in-situ free radical

Role of catalase on the hypoxia/reoxygenation stress in the hypoxia-tolerant Nile tilapia.

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The specific contribution of each antioxidant enzyme to protection against the reoxygenation-associated oxidative stress after periods of hypoxia is not well understood. We assessed the physiological role of catalase during posthypoxic reoxygenation by the combination of two approaches. First,

Dysregulation of catalase activity in newborn myocytes during hypoxia is mediated by c-Abl tyrosine kinase.

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In the adult heart, catalase (CAT) activity increases appropriately with increasing levels of hydrogen peroxide, conferring cardioprotection. This mechanism is absent in the newborn for unknown reasons. In the present study, we examined how the posttranslational modification of CAT contributes to

Catalase-Functionalized Iron Oxide Nanoparticles Reverse Hypoxia-Induced Chemotherapeutic Resistance.

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Intratumoral hypoxia is a major contributor to multiple drug resistance (MDR) in cancer, and can lead to poor prognosis of patients receiving chemotherapy. Development of an MDR-inhibitor that mitigates the hypoxic environment is crucial for cancer management and treatment. Reported is a
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