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The Journal of Neuroscience, September 1, 1998, 18(17):6822-6829
Calcium Elevation in Astrocytes Causes an NMDA Receptor-Dependent Increase in the Frequency of Miniature Synaptic Currents in Cultured Hippocampal Neurons
Alfonso Araque, Rita P. Sanzgiri, Vladimir Parpura, and Philip G. Haydon Laboratory of Cellular Signaling, Department of Zoology and Genetics, Iowa State University, Ames, Iowa 50011
Astrocytes exhibit a form of excitability and communication on the basis of intracellular Ca2+ variations (; ) that can be initiated by neuronal activity (; ). A Ca2+ elevation in astrocytes induces the release of glutamate (; ; ; ), which evokes a slow inward current in neurons and modulates action potential-evoked synaptic transmission between cultured hippocampal cells (), suggesting that astrocytes and neurons may function as a network with bidirectional communication. Here we show that a Ca2+ elevation in astrocytes increases the frequency of excitatory as well as inhibitory miniature postsynaptic currents (mPSCs), without modifying their amplitudes. Thapsigargin incubation, microinjection of the Ca2+ chelator BAPTA, and photolysis of the Ca2+ cage NP-EGTA demonstrate that a Ca2+ elevation in astrocytes is both necessary and sufficient to modulate spontaneous transmitter release. This Ca2+-dependent release of glutamate from astrocytes enhances mPSC frequency by acting on NMDA glutamate receptors, because it is antagonized by D-2-amino-5-phosphonopentanoic acid (AP5) or extracellular Mg2+. These NMDA receptors are located extrasynaptically, because blockage specifically of synaptic NMDA receptors by synaptic activation in the presence of the open channel blocker MK-801 did not impair the AP5-sensitive astrocyte-induced increase of mPSC frequency. Therefore, astrocytes modulate spontaneous excitatory and inhibitory synaptic transmission by increasing the probability of transmitter release via the activation of NMDA receptors.
Key words: astrocyte-neuron signaling; NMDA glutamate receptors; calcium cage photolysis; calcium waves; miniature synaptic currents; hippocampal synaptic transmission
Copyright © 1998 Society for Neuroscience 0270-6474/98/18176822-08$05.00/0
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