Guanine nucleotides block agonist-driven 45Ca2+ influx in chick embryo retinal explants.

Abstract:

:AMPA (EC50 = 1.0 x 10(-6) M) and NMDA (EC50 = 1.3 x 10(-4) M) trigger 45Ca2+ influx in 13-day chick embryonic retinal explants. This agonist-driven cationic flux is specifically inhibited by typical competitive antagonists, such as 6,7-dinitroquinoxaline-2,3-dione (DNQX) and 2-amino-7-phosphonoheptanoate (AP7), respectively. Guanine nucleotides, with different degrees of phosphorylation, namely 5'-GMP, guanosine 5'-O-(2-thiodiphosphate) (GDPbetaS), guanosine 5'-O-(3-thiotriphosphate) (GTPgammaS) and 5'-guanylyl-imidodiphosphate (GppNHp), are also efficient blockers of 45Ca2+ influx. These results confirm the antagonistic behavior of guanine nucleotides towards ionotropic glutamate receptors and suggest a convenient experimental approach for screening of novel agonists and antagonists.

journal_name

Neuroreport

journal_title

Neuroreport

authors

Burgos JS,Barat A,Ramírez G

doi

10.1097/00001756-200007140-00047

subject

Has Abstract

pub_date

2000-07-14 00:00:00

pages

2303-5

issue

10

eissn

0959-4965

issn

1473-558X

journal_volume

11

pub_type

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