Charity O Kirby

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Retinal ischemia, a major cause of visual loss, is believed to result from overexcitation of glutamate receptors. However, under euglycemic and normoxic conditions, exogenously applied glutamate is not neurotoxic in the retina. Under such conditions, exogenous glutamate typically causes glia swelling and requires very high concentrations to produce(More)
We characterized morphological effects of the endogenous excitotoxin, glutamate in ex vivo retinal segments prepared from 30-day-old rats. Initial changes induced by glutamate consisted of reversible, sodium-dependent Müller cell swelling. This glial swelling was mimicked by glutamate transport substrates but not by ionotropic glutamate receptor agonists.(More)
Recent evidence implicates the endogenous excitatory neurotransmitters, glutamate (Glu) and aspartate, in the pathophysiology of traumatic injury in the adult CNS, but it is not known whether similar excitotoxic mechanisms mediate traumatic injury in the immature CNS. Therefore, we developed a model of brain contusion injury in infant rats and used this(More)
In acute brain injury syndromes, the potent N-methyl-D-aspartate (NMDA) antagonist, MK-801, can prevent neuronal degeneration, and the general anesthetics, isoflurane and propofol, may also provide neuroprotective benefits. An obstacle to the use of NMDA antagonists for neuroprotective purposes is that they can cause a neurotoxic vacuole reaction in(More)
Phencyclidine, ketamine, and other agents that block NMDA glutamate receptors trigger a schizophrenia-like psychosis in humans and induce pathomorphological changes in cerebrocortical neurons in rat brain. Accumulating evidence suggests that a complex network disturbance involving multiple transmitter receptor systems is responsible for the neuronal injury,(More)
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