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Glutamate receptors and spider toxins. Nobufumi KAWAI 1 1Department of Physiology, Jichi Medical School pp.953-960
Published Date 1991/12/10
DOI https://doi.org/10.11477/mf.1431900195
  • Abstract
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Characterization of glutamate receptors have been employed using a specific blocker derived from the venom of spider Nephila clavata. The toxin (JSTX) preferentially blocks quisqualate type glutamate receptors in crustacean neuromuscular synapse, squid giant synapse and mammalian brain synapses. Following determination of the structure of JSTXs, a main component JSTX-3 with its analog were chemically synthesized and used for the study of structure-activity relationships. Labeled spider toxins were synthesized for the histological and biochemical studies of the glutamate receptors. 125I labeled JSTX-3 and biotinylated JSTX-3 were used for visualization of glutamate receptors in crustacean muscle and mammalian brain. Using affinity purification, JSTX-3-binding proteins were isolated from bovine brain. The purified protein was reconstituted into giant liposomes and channel activities in-duced by glutamate in the patch pipet was blocked by JSTX. By use of JSTX and pertussis toxin, a novel type of glutamate receptor-GluB receptor was found in crustacean neuromuscular synapse. While the postsynaptic glutamate receptor was blocked by JSTX, GluB receptor was insensitive to JSTX but it was blocked by pertussis toxin indicating the involvement of inhibitory GTP-binding protein. Injection of GTPrS in the presynaptic axon mimicked the presynaptic glutamate potentials and caused presynaptic inhibitory action which is concluded by quantal analysis of excitatory postsynaptic currents. GluB receptors thus exert presynaptic inhibitory effect and regulate transmitter release in the crustacean neuromuscular synapse.


Copyright © 1991, Igaku-Shoin Ltd. All rights reserved.

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電子版ISSN 1882-1243 印刷版ISSN 0001-8724 医学書院

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