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• W2078366377 abstract "Equatorial organization of myosin II and actin has been recognized as a universal event in cytokinesis of animal cells. Current models for the formation of equatorial cortex favor either directional cortical transport toward the equator or localized de novo assembly. However, this process has never been analyzed directly in dividing mammalian cells at a high resolution. Here we applied total internal reflection fluorescence microscope (TIRF-M), coupled with spatial temporal image correlation spectroscopy (STICS) and a new analytical approach termed temporal differential microscopy (TDM), to image the dynamics of myosin II and actin during the assembly of equatorial cortex. Our results indicated distinct and at least partially independent mechanisms for the early equatorial recruitment of myosin and actin filaments. Cortical myosin showed no detectable directional flow during early cytokinesis. In addition to equatorial assembly, we showed that localized inhibition of disassembly contributed to the formation of the equatorial myosin band. In contrast to myosin, actin filaments underwent a striking flux toward the equator. Myosin motor activity was required for the actin flux, but not for actin concentration in the furrow, suggesting that there was a flux-independent, de novo mechanism for actin recruitment along the equator. Our results indicate that cytokinesis involves signals that regulate both assembly and disassembly activities and argue against mechanisms that are coupled to global cortical movements." @default.
• W2078366377 created "2016-06-24" @default.
• W2078366377 creator A5069516330 @default.
• W2078366377 creator A5073353122 @default.
• W2078366377 date "2008-01-01" @default.
• W2078366377 modified "2023-10-14" @default.
• W2078366377 title "Distinct Pathways for the Early Recruitment of Myosin II and Actin to the Cytokinetic Furrow" @default.
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• W2078366377 doi "https://doi.org/10.1091/mbc.e07-08-0783" @default.
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• W2078366377 hasPublicationYear "2008" @default.
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