ATP hydrolysis is required for the rapid regulation of AMPA receptors during basal synaptic transmission and long-term synaptic plasticity

ATP hydrolysis is critical for many cellular processes; however, the acute requirement for ATP hydrolysis in synaptic transmission and plasticity in neurons is unknown. Here we studied the effects of postsynaptically applying the non-hydrolyzable ATP analogue adenosine 5 '-[beta,gamma-methylene]triphosphate (AMP-PCP) into hippocarnpal CAl pyramidal cells in hippocampal slices. The effects of this manipulation were investigated on basal transmission and on two forms of long-term synaptic plasticity, long-term potentiation (LTP) and long-term depression (LTD). AMP-PCP caused an increase in basal AMPA receptor (AMPAR)mediated transmission, which occurred rapidly within minutes of infusing the drug. This effect was selective for ANIPARs, since pharmacologically isolated NMDAR-mediated synaptic currents did not exhibit this run up. In two-pathway experiments infusion of ANIP-PCP blocked the induction of both LTD and LTP. These findings show an acute and selective role for ATP hydrolysis in regulating AMPAR function both during basal transmission and long-term synaptic plasticity. Recent evidence indicates that AMPARs are selectively and acutely regulated by the ATPase N-ethylmaleimide-sensitive factor (NSF), which forms part of a multiprotein complex with AMPARs. Our data are consistent with the idea that such a mechanism that can acutely bi-directionally regulate AMPAR function at synapses and requires ATP hydrolysis is necessary for rapid activity-dependent changes in synaptic strength. (c) 2005 Elsevier Ltd. All rights reserved.