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
Neuronjournal_title
Neuronauthors
Pruss RM,Akeson RL,Racke MM,Wilburn JLdoi
10.1016/0896-6273(91)90302-gsubject
Has Abstractpub_date
1991-09-01 00:00:00pages
509-18issue
3eissn
0896-6273issn
1097-4199pii
0896-6273(91)90302-Gjournal_volume
7pub_type
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