A new type of glutamate receptor linked to inositol phospholipid metabolism.

Abstract:

:Receptors for excitatory amino acids in the mammalian central nervous system are classified into three major subtypes, ones which prefer N-methyl-D-aspartate (NMDA), quisqualate (QA), or kainate (KA) as type agonists respectively. These receptors are considered to mediate fast postsynaptic potentials by activating ion channels directly (ionotropic type). Recently it was reported that exposure of mammalian brain cells to glutamate (Glu) or its analogues causes enhanced hydrolysis of inositol phospholipids, but it is not clear whether the enhanced hydrolysis is the cause or effect of physiological responses. Membrane depolarization or Ca2+ influx, which can result from Glu receptor activation, can induce enhanced hydrolysis of inositol phospholipids. We have characterized the functional properties of two types of excitatory amino-acid responses, those activated by QA (or Glu) and those activated by KA, induced in Xenopus oocytes injected with rat-brain messenger RNA. We report evidence for a new type of Glu receptor, which prefers QA as agonist, and which directly activates inositol phospholipid metabolism through interaction with GTP-binding regulatory proteins (Gi or Go), leading to the formation of inositol 1,4,5-trisphosphate (InsP3) and mobilization of intracellular Ca2+. This QA/Glu reaction is inhibited by islet-activating protein (IAP, pertussis toxin), but was not blocked by Joro spider toxin (JSTX), a specific blocker of traditional ionotropic QA/Glu receptors.

journal_name

Nature

journal_title

Nature

authors

Sugiyama H,Ito I,Hirono C

doi

10.1038/325531a0

subject

Has Abstract

pub_date

1987-02-05 00:00:00

pages

531-3

issue

6104

eissn

0028-0836

issn

1476-4687

journal_volume

325

pub_type

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