Reversing Cerebellar Long-term Depression

Overview

Journal Proc Natl Acad Sci U S A

Specialty Science

Date 2003 Dec 13

PMID 14671315

Citations 64

Authors

Varda Lev-Ram

Samar B Mehta

David Kleinfeld

Roger Y Tsien

Affiliations

Soon will be listed here.

Abstract

The discovery of a postsynaptically expressed form of cerebellar parallel fiber-Purkinje cell long-term potentiation (LTP) raises the question whether this is the long-sought resetting mechanism for long-term depression (LTD). Extracellular monitoring of PC spikes enables stable prolonged recordings of parallel fiber-Purkinje cell synaptic efficacy. LTD, saturated by repeated induction protocols, can be reversed by a single round of postsynaptic LTP or nitric oxide (NO), enabling LTD to be reinduced. Conversely, after postsynaptic LTP has been saturated, one round of LTD permits fresh postsynaptic LTP. By contrast, after saturation of LTD, induction of presynaptic LTP or application of forskolin leaves LTD still saturated. Likewise, presynaptic LTP cannot be reversed by LTD. Therefore postsynaptic LTP mediated by NO without postsynaptic Ca2+ elevation, unlike presynaptic LTP mediated by cAMP, is a true counterbalance to LTD mediated by coincidence of NO plus postsynaptic Ca2+

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