Journal
NEURON
Volume 64, Issue 3, Pages 391-403Publisher
CELL PRESS
DOI: 10.1016/j.neuron.2009.10.021
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Funding
- Alberta Heritage Foundation for Medical Research (AHFMR)
- Heart and Stroke Foundation of Canada (HSFC)
- Michael Smith Foundation for Health Research (MSFHR)
- Natural Sciences and Engineering Council of Canada (NSERC)
- AHFMR
- HSFC
- NIH [GM53395]
- Canadian Institutes for Health Research (CIHR)
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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 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 form of distributed synaptic plasticity that is feed-forward, expressed quickly, and mediated by the synaptic activation of neighboring astrocytes.
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