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Role of glutamate and its receptors and insulin-like growth factors in hypoxia induced periventricular white matter injury.

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This study investigated the glutamate concentration and cellular localization of alpha-amino-3-hydroxy-5-methyl-4-isoxazole propionic acid glutamate receptors (AMPA GluR2, GluR3, GluR4) along with insulin-like growth factors (IGF)-1 and -2 expression in the periventricular white matter (PWM) of

Prebiotic administration modulates gut microbiota and faecal short-chain fatty acid concentrations but does not prevent chronic intermittent hypoxia-induced apnoea and hypertension in adult rats

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Background: Evidence is accruing to suggest that microbiota-gut-brain signalling plays a regulatory role in cardiorespiratory physiology. Chronic intermittent hypoxia (CIH), modelling human sleep apnoea, affects gut microbiota composition

In rat hippocampal slices, NMDA receptor-mediated EPSPs are more sensitive to hypoxia than AMPA receptor-mediated EPSPs.

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In slices kept at 33 degrees C, N-methyl-D-aspartate (NMDA) receptor- and (+/-)-alpha-amino-3-hydroxy-5-methylisoxazole-4-propionic acid (AMPA) receptor-mediated field excitatory post-synaptic potentials (EPSPs) were pharmacologically isolated in CA1. Both types of EPSPs were reversibly blocked by 3

Erythropoietin protects cultured cortical neurons, but not astroglia, from hypoxia and AMPA toxicity.

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In addition to its better-known hemopoietic action, erythropoietin (Epo) has neurotrophic properties and neuroprotective effects in some models of hypoxic-ischemic injury. To define further the cellular mechanisms underlying neuroprotection by Epo, we studied the effects of Epo on hypoxia with

NBQX blocks acute and late epileptogenic effects of perinatal hypoxia.

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Clinically, and in experimental models, perinatal hypoxic encephalopathy is commonly associated with seizures. We previously described a rat model in which hypoxia induces seizures and permanently increases in seizure susceptibility in immature rats [postnatal day (P) 10-12] but not in older rats.

Conservation of phosphorylation state of cardiac phosphofructokinase during in vitro hypothermic hypoxia.

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We investigated the metabolic effects of buffering agents alpha-amino-4-imidazole-propionic acid (Histidine), N, N-bis(2-hydroxyethyl)glycine (bicine), N, N-bis(2-hydroxyethyl)-2-aminoethanesulfonic acid (BES) on anaerobic energy production (via glycolysis) and conservation of key regulatory enzyme

Hypoxic pulmonary vasoconstriction is unaltered by creatine depletion induced by dietary beta-guanidino propionic acid.

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It has been suggested that a specific phosphagen pool might serve a sensor function, allowing direct detection of alveolar hypoxia by the pulmonary vascular smooth muscle. The possibility that phosphocreatine (PCr) levels could serve as such a sensor was assessed in isolated rat lungs. Pulmonary

Intrauterine hypoxia-ischemia reduces phosphoinositide hydrolysis stimulated by metabotropic glutamate receptor agonists in cultured rat cerebellar granule cells.

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Effects of intrauterine hypoxia-ischemia (HI) on receptor-stimulated phosphoinositide (PPI) hydrolysis were studied in rat cerebellar granule cell cultures prepared from an in utero HI model. On gestation day 17, HI conditions were achieved by complete clamping of the uterine vasculature for 30 min

Topiramate blocks perinatal hypoxia-induced seizures in rat pups.

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Neonatal seizures caused by hypoxia can be refractory to conventional anticonvulsants. Currently, there is no effective postnatal intervention for newborn infants with hypoxic encephalopathy to prevent brain injury and long-term neurologic sequelae. We previously developed a rat model of perinatal

The anti-tumor efficacy of 3-(2-Nitrophenyl) propionic acid-paclitaxel (NPPA-PTX): a novel paclitaxel bioreductive prodrug.

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Hypoxia is an important microenvironmental pressure present in the majority of solid tumors and, so, tumor hypoxia might be considered an attractive target for tumor therapy. One strategy for targeting hypoxia is to develop bioreductive prodrugs. In the present research, we synthesized a

Developmental regulation of alpha-amino-3-hydroxy-5-methyl-4-isoxazole-propionic acid receptor subunit expression in forebrain and relationship to regional susceptibility to hypoxic/ischemic injury. II. Human cerebral white matter and cortex.

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This report is the second of a two-part evaluation of developmental differences in alpha-amino-3-hydroxy-5-methyl-4-isoxazole-propionic acid receptor (AMPAR) subunit expression in cell populations within white matter and cortex. In part I, we reported that, in rat, developmental expression of

Antitumor activity and pharmacodynamic properties of PX-478, an inhibitor of hypoxia-inducible factor-1alpha.

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The hypoxia-inducible factor-1 (HIF-1) transcription factor is an important regulator of tumor response to hypoxia that include increased angiogenesis, glycolytic metabolism, and resistance to apoptosis. HIF-1 activity is regulated by the availability of the HIF-1alpha subunit, the levels of which

Molecular mechanisms for the activity of PX-478, an antitumor inhibitor of the hypoxia-inducible factor-1alpha.

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We have reported previously that PX-478 (S-2-amino-3-[4'-N,N,-bis(chloroethyl)amino]phenyl propionic acid N-oxide dihydrochloride) has potent antitumor activity against a variety of human tumor xenografts associated with the levels of the hypoxia-inducible factor-1alpha (HIF-1alpha) within the

Isoflurane postconditioning induces concentration- and timing-dependent neuroprotection partly mediated by the GluR2 AMPA receptor in neonatal rats after brain hypoxia-ischemia.

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It has been demonstrated that preconditioning with 1.5 % isoflurane reduces hypoxia/ischemia (HI)-induced brain loss/injury in neonatal rats. Ca(2+) influx mediated by α-amino-3-hydroxy-5-methylisoxazole-4-propionic acid receptors (AMPARs) is involved in HI-induced neuronal death. Here, we

Ampakine CX717 potentiates intermittent hypoxia-induced hypoglossal long-term facilitation.

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Glutamatergic currents play a fundamental role in regulating respiratory motor output and are partially mediated by α-amino-3-hydroxy-5-methyl-isoxazole-propionic acid (AMPA) receptors throughout the premotor and motor respiratory circuitry. Ampakines are pharmacological compounds that enhance

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