Geir Arne Larsen

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During cerebral ischemia neuronal injury is induced by a combination of hypoxia, hypoglycemia and glutamate excitotoxicity. To evaluate the relative importance of these factors on the mitochondrial function, acutely isolated rat hippocampal CA1 neurons were loaded with Rhodamine 123 to monitor the mitochondrial membrane potential (Deltapsim). During 15 min(More)
Hypoxic-ischemic brain injury subsequent to asphyxia represents a major cause of morbidity and death in the newborn. The newborn brain has been considered more resistant to hypoxia than the adult brain because of lower energy demand. The mechanisms underlying hypoxic brain injury, in particular the age-related vulnerability, are still only partially(More)
Volatile anesthetics reduce excitatory synaptic transmission in the mammalian brain. In the present study, the effect of sevoflurane on synaptic glutamate release, free cytosolic Ca2+ ([Ca2+]i), and glutamate uptake was investigated using isolated presynaptic terminals prepared from human cerebral cortex. The tissue was obtained from standard temporal lobe(More)
Intracellular calcium ([Ca2+]i) plays a pivotal role in neuronal ischemia. The aim of the present study was to investigate the routes of Ca2+ entry during non-excitotoxic oxygen and glucose deprivation (OGD) in acutely dissociated rat CA1 neurons. During OGD the fluo-3/fura red ratio reflecting [Ca2+]i increased rapidly and irreversibly. [Ca2+]i increased(More)
Protein kinase C (PKC) is an important enzyme involved in the regulation of neurotransmission and might also be important in the mediation of ischemic neuronal death. PKC has been implicated as a target of volatile anesthetics as well as in anesthetic protection against ischemia. The present study tested the effect of isoflurane and sevoflurane, both used(More)
Glutamate excitotoxicity and necrotic cell death are characteristic features of ischemic neuronal injury. In the penumbral area, glutamate exposure is less pronounced and neuronal death is delayed. Recent studies suggest that delayed neuronal death is propagated by intracellular signalling pathways. Protein kinase C (PKC) activation may initiate apoptosis,(More)
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