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Previous Article | Next Article
Volume 16, Number 16, Issue of August 15, 1996 pp. 5073-5081
Copyright ©1996 Society for NeuroscienceHippocampal Astrocytes In Situ Respond to Glutamate Released from Synaptic Terminals
Received Feb. 22, 1996; revised May 20, 1996; accepted May 30, 1996.
James T. Porter and Ken D. McCarthy Department of Pharmacology, University of North Carolina School of Medicine, Chapel Hill, North Carolina 27599
A long-standing question in neurobiology is whether astrocytes respond to the neuronal release of neurotransmitters in vivo. To address this question, acutely isolated hippocampal slices were loaded with the calcium-sensitive dye Calcium Green-1 and the responses of the astrocytes to electrical stimulation of the Schaffer collaterals were monitored by confocal microscopy. To confirm that the responsive cells were astrocytes, the slices were immunostained for the astrocytic marker glial fibrillary acidic protein. Stimulation of the Schaffer collaterals (50 Hz, 2 sec) resulted in increases in the concentration of intracellular calcium ([Ca2+]i) in the astrocytes located in the stratum radiatum of CA1. The astrocytic responses were blocked by the sodium channel blocker tetrodotoxin, the voltage-dependent calcium channel blocker
-conotoxin-MVIIC, and the selective metabotropic glutamate receptor antagonist
-methyl-4-carboxyphenylglycine (MCPG). These results suggest that the astrocytic responses were induced by stimulation of metabotropic glutamate receptors on the astrocytes by neuronally released glutamate. The astrocytic responses to neuronal stimulation were enhanced in the presence of the K+ channel antagonist 4-aminopyridine (4-AP). Inhibition of the astrocytic responses in the presence of 4-AP required the presence of both MCPG and the ionotropic glutamate receptor antagonist kynurenic acid. These results suggest that higher levels of neuronal activity result in stimulation of both metabotropic and ionotropic glutamate receptors on the astrocytes. Overall, the results indicate that hippocampal astrocytes in situ are able to respond to the neuronal release of the neurotransmitter glutamate with increases in [Ca2+]i.
Key words: hippocampus; astrocytes; in situ; intracellular calcium; metabotropic glutamate receptors; ionotropic glutamate receptors; CA1; stratum radiatum; neural-glial interactions
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