Agonist-activated cobalt uptake identifies divalent cation-permeable kainate receptors on neurons and glial cells.

Abstract:

:Activation of kainate receptors causes Co2+ influx into neurons, type-2 astrocytes, and O-2A progenitor cells. Agonist-activated Co2+ uptake can be performed using cultured cells or fresh tissue slices. Based on the pattern of response to kainate, glutamate, and quisqualate, three functionally different kainate-activated ion channels (K1, K2, and K3) can be discriminated. Co2+ uptake through the K1 receptor was only activated by kainate. Both kainate and glutamate activated Co2+ uptake through the K2 receptor. Co2+ uptake through the K3 receptor was activated by all three ligands: kainate, glutamate, and quisqualate. Co2+ uptake occurred through a nonselective cation entry pathway permeable to Co2+, Ca2+, and Mn2+. The agonist-dependent activation of divalent cation influx through different kainate receptors could be correlated with expression of certain kainate receptor subunit combinations. These results are indicative of kainate receptors that may contribute to excitatory amino acid-mediated neurotoxicity.

journal_name

Neuron

journal_title

Neuron

authors

Pruss RM,Akeson RL,Racke MM,Wilburn JL

doi

10.1016/0896-6273(91)90302-g

subject

Has Abstract

pub_date

1991-09-01 00:00:00

pages

509-18

issue

3

eissn

0896-6273

issn

1097-4199

pii

0896-6273(91)90302-G

journal_volume

7

pub_type

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