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INTERPLASTICITY

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Long term synaptic plasticity in interneurons mechanisms and computational sign...

Long term synaptic plasticity in interneurons mechanisms and computational significance Memory encoding occurs by strengthening or weakening of synapses among principal neurons. However, excitatory synapses on some inhibitory neurons in the hippocampus also exhibit use-dependent long-term potentiation and depression... ver más

30/09/2014

UNIVERSITY COLLEGE...

3M€

Presupuesto del proyecto: 3M€

Líder del proyecto

UNIVERSITY COLLEGE LONDON No se ha especificado una descripción o un objeto social para esta compañía.

Fecha límite participación Sin fecha límite de participación.

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Financiación concedida El organismo FP7 notifico la concesión del proyecto el día 2014-09-30 No tenemos la información de la convocatoria

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2 Participantes

UNIVERSITY COLLEGE LONDON

2.50M€ | Lider

UNIVERSITY COLLEGE LONDON

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Líder del proyecto

UNIVERSITY COLLEGE LONDON No se ha especificado una descripción o un objeto social para esta compañía.

Presupuesto del proyecto 3M€

Fecha límite de participación Sin fecha límite de participación.

Descripción del proyecto Memory encoding occurs by strengthening or weakening of synapses among principal neurons. However, excitatory synapses on some inhibitory neurons in the hippocampus also exhibit use-dependent long-term potentiation and depression (LTP and LTD), with important consequences for network homeostasis and information processing. This proposal addresses the following areas: 1. Although the rules determining which forms of plasticity occur at which synapses are emerging in the hippocampus, relatively little is known in other parts of the brain involved in cognition, movement initiation and emotion. We will use electrophysiology, optical imaging and mouse genetics to map out the expression of activity-dependent plasticity at excitatory synapses on inhibitory neurons in the cortex, striatum and amygdala, and relate these to the biophysical and pharmacological properties of the neurons and synapses involved. 2. Although one form of interneuron LTP resembles plasticity in pyramidal neurons, another form requires Ca2+-permeable AMPA receptors and metabotropic glutamate receptors for its induction, and shows features suggestive of pre-synaptic expression. A similar dichotomy exists in two forms of LTD, which depend on either NMDA or Ca2+-permeable AMPA and metabotropic glutamate receptors. We will test the involvement of candidate intracellular and trans-synaptic signalling cascades to understand the mechanisms triggered by distinct conjunction patterns of pre- and post-synaptic activity. 3. What is the computational significance of LTP and LTD in interneurons? The elemental computational roles of different GABAergic interneurons and their firing patterns during behaviourally relevant brain states are beginning to emerge. How synaptic strengthening and/or weakening interact with these network functions is however poorly understood. We will address this through a combination of hypothesis-driven experiments and numerical simulations.

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