An Optical Neuron-Astrocyte Proximity Assay at Synaptic Distance Scales.

Abstract:

:Astrocytes are complex bushy cells that serve important functions through close contacts between their processes and synapses. However, the spatial interactions and dynamics of astrocyte processes relative to synapses have proven problematic to study in adult living brain tissue. Here, we report a genetically targeted neuron-astrocyte proximity assay (NAPA) to measure astrocyte-synapse spatial interactions within intact brain preparations and at synaptic distance scales. The method exploits resonance energy transfer between extracellularly displayed fluorescent proteins targeted to synapses and astrocyte processes. We validated the method in the striatal microcircuitry following in vivo expression. We determined the proximity of striatal astrocyte processes to distinct neuronal input pathways, to D1 and D2 medium spiny neuron synapses, and we evaluated how astrocyte-to-excitatory synapse proximity changed following cortical afferent stimulation, during ischemia and in a model of Huntington's disease. NAPA provides a simple approach to measure astrocyte-synapse spatial interactions in a variety of experimental scenarios. VIDEO ABSTRACT.

journal_name

Neuron

journal_title

Neuron

authors

Octeau JC,Chai H,Jiang R,Bonanno SL,Martin KC,Khakh BS

doi

10.1016/j.neuron.2018.03.003

subject

Has Abstract

pub_date

2018-04-04 00:00:00

pages

49-66.e9

issue

1

eissn

0896-6273

issn

1097-4199

pii

S0896-6273(18)30180-6

journal_volume

98

pub_type

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