Binding and functions of extracellular ATP in cultured cerebellar granule neurons.

Abstract:

:Selected purinoceptor modulators were previously shown to prevent glutamate-evoked cytotoxicity in cerebellar granule neurons. In the same cellular system, we now identify and characterize the presence of P2 receptors. The binding of [3H]ATP to membranes of cerebellar granule neurons grows monotonically as a function of neuronal differentiation, is saturable and reaches steady state within 6 min. Scatchard plot of the equilibrium saturation data is curvilinear with a Kd value of 28 nM and a Bmax value of 87 pmol/ mg of protein for the high affinity binding sites and a Kd value of 1.5 microM and Bmax value of 1.2 nmol/mg of protein, for the more numerous low affinity binding sites. We also show that extracellular ATP increases the release, but not the uptake, of [3H]D-aspartate and that it furthermore potentiates the release of [3H]D-aspartate evoked by glutamate and KCI. ATP itself is released by cerebellar granule cultures and such release grows monotonically as a function of neuronal differentiation. These data are consistent with the role that ATP is believed to play as a cotransmitter for the central nervous system.

authors

Merlo D,Volonté C

doi

10.1006/bbrc.1996.1271

subject

Has Abstract

pub_date

1996-08-23 00:00:00

pages

907-14

issue

3

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(96)91271-1

journal_volume

225

pub_type

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