Spatially restricted actin-regulatory signaling contributes to synapse morphology.

Spatially restricted actin-regulatory signaling contributes to synapse morphology.
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DOI:
10.1111/j.1471-4159.2012.07743.x
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发表时间:
2012-06
影响因子:
4.7
通讯作者:
Penzes P
Penzes P
中科院分区:
医学2区
文献类型:
--
作者:
Nicholson DA;Cahill ME;Tulisiak CT;Geinisman Y;Penzes P

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The actin cytoskeleton in dendritic spines is organized into microdomains, but how signaling molecules that regulate actin are spatially governed is incompletely understood. Here we examine how the localization of the RacGEF kalirin-7, a well-characterized regulator of actin in spines, varies as a function of postsynaptic density (PSD) area and spine volume. Using serial section electron microscopy (EM), we find that extrasynaptic, but not synaptic, expression of kalirin-7 varies directly with synapse size and spine volume. Moreover, we find that overall expression levels of kalirin-7 differ in spines bearing perforated and non-perforated synapses, due primarily to extrasynaptic pools of kalirin-7 expression in the former. Overall, our findings indicate that kalirin-7 is differentially compartmentalized in spines as a function of both synapse morphology and spine size.
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