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• W2524995710 abstract "Abstract Actin cytoskeleton is composed of functionally distinct pools of filamentous (F)-actin defined by their regulatory machinery and dynamics. Although these networks may compete for actin monomers and regulatory factors 1–4 , the interaction between them remains poorly understood. Here, we show that disruption of the labile F-actin pool in neurons by limited actin depolymerization 5,6 unexpectedly triggers rapid enhancement of the F-actin content at the dendritic spine. Long-term blockade of NMDA-type receptors decreases spine actin polymerization, which is specifically restored by the labile pool ablation. Increase in the spine actin is triggered by blockade of formin-induced actin polymerization in a manner dependent on Arp2/3 complex activity. Finally, limited actin depolymerization increases F-actin levels in a cultured cell line, suggesting the generality of the two-tiered actin dynamics. Based on these findings, we propose a model whereby the labile pool of F-actin controlled by formin restricts the polymerization state of the Arp2/3-regulated stable spine actin, suggesting a feedback principle at the core of cytoskeletal organization in neurons. Highlights Disruption of labile F-actin by limited depolymerization rapidly increases the synaptic F-actin content; The depolymerization-induced F-actin boost reverses decrease in synaptic F-actin induced by long-term NMDA receptor blockade; Blockade of formin-dependent actin polymerization boosts synaptic F-actin in an Arp2/3-dependent manner; Limited actin depolymerization enhances overall F-actin content in a mammalian cell line." @default.
• W2524995710 created "2016-10-07" @default.
• W2524995710 creator A5060339478 @default.
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• W2524995710 date "2016-09-27" @default.
• W2524995710 modified "2023-09-25" @default.
• W2524995710 title "Interaction between distinct actin pools controls activity-dependent actin dynamics in the dendritic spine" @default.
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• W2524995710 doi "https://doi.org/10.1101/077933" @default.
• W2524995710 hasPublicationYear "2016" @default.
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