Astrocyte-mediated distributed plasticity at hypothalamic glutamate synapses.

Astrocyte-mediated distributed plasticity at hypothalamic glutamate synapses.
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DOI:
10.1016/j.neuron.2009.10.021
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发表时间:
2009-11-12
期刊:
影响因子:
16.2
通讯作者:
Bains, Jaideep S.
Bains, Jaideep S.
中科院分区:
医学1区
文献类型:
--
作者:
Gordon, Grant R. J.;Iremonger, Karl J.;Kantevari, Srinivas;Ellis-Davies, Graham C. R.;MacVicar, Brian A.;Bains, Jaideep S.

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Afferent activity can induce fast, feed-forward changes in synaptic efficacy that are synapse-specific. Using combined electrophysiology, caged molecule photolysis and Ca2+ imaging, we describe a novel plasticity in which the recruitment of astrocytes in response to afferent activity causes a fast and feed-forward, yet distributed increase in the amplitude of quantal synaptic currents at multiple glutamate synapses on magnocellular neurosecretory cells in the hypothalamic paraventricular nucleus. The plasticity is largely multiplicative, consistent with a proportional increase or ‘scaling’ in the strength of all synapses on the neuron. This effect requires a metabotropic glutamate receptor-mediated rise in Ca2+ in the astrocyte processes surrounding the neuron and the release of the gliotransmitter ATP, which acts on postsynaptic purinergic receptors. These data provide evidence for a new form of distributed synaptic plasticity that is feed-forward, is expressed quickly and is mediated by the synaptic activation of neighboring astrocytes.
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