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Journal of Neuroscience, Vol 12, 1882-1895, Copyright © 1992 by Society for Neuroscience
Glutamate-induced calcium transient triggers delayed calcium overload and neurotoxicity in rat hippocampal neurons
RD Randall and SA Thayer
Department of Pharmacology, University of Minnesota Medical School, Minneapolis 55455.
Glutamate-induced changes in intracellular free Ca2+ concentration
([Ca2+]i) were recorded in single rat hippocampal neurons grown in primary
culture by employing the Ca2+ indicator indo-1 and a dual- emission
microfluorimeter. The [Ca2+]i was monitored in neurons exposed to 100
microM glutamate for 5 min and for an ensuing 3 hr period. Ninety-two
percent (n = 64) of these neurons buffered the glutamate- induced Ca2+ load
back to basal levels after removal of the agonist; thus, the majority of
cells had not lost the ability to regulate [Ca2+]i at this time. However,
following a variable delay, in 44% (n = 26) of the neurons that buffered
glutamate-induced Ca2+ loads to basal levels, [Ca2+]i rose again to a
sustained plateau and failed to recover. The changes in [Ca2+]i that occur
during glutamate-induced delayed neuronal death can be divided into three
phases: (1) a triggering phase during which the neuron is exposed to
glutamate and the [Ca2+]i increases to micromolar levels, followed by (2) a
latent phase during which the [Ca2+]i recovers to a basal level, and (3) a
final phase that begins with a gradual rise in the [Ca2+]i that reaches a
sustained plateau from which the neuron does not recover. This delayed Ca2+
overload phase correlated significantly with cell death. The same sequence
of events was also observed in recordings from neuronal processes. The
delayed Ca2+ increase and subsequent death were dependent upon the presence
of extracellular Ca2+ during glutamate exposure. Calcium influx during the
triggering phase resulted from the activation of both NMDA and non-NMDA
receptors as indicated by studies using receptor antagonists and ion
substitution. Treatment with TTX (1 microM) or removal of extracellular
Ca2+ for a 30 min window following agonist exposure failed to prevent the
delayed Ca2+ overload. The delayed [Ca2+]i increase could be reversed by
removing extracellular Ca2+, indicating that it resulted from Ca2+ influx.
The three phases defined by changes in the [Ca2+]i during glutamate-induced
neuronal toxicity suggest three distinct targets to which neuroprotective
agents may be directed.
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