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A more recent version of this article appeared on May 1, 2004
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Submitted on September 30, 2003
Revised on January 22, 2004
Accepted on January 22, 2004
1 Department of Anatomy, Johannes Gutenberg-University, Becherweg 13, 55128 Mainz, Germany
* Corresponding author. E-mail address: leube{at}mail.uni-mainz.de.
It is generally assumed that turnover of the keratin filament system occurs by exchange of subunits along its entire length throughout the cytoplasm. We now present evidence that a circumscribed submembranous compartment is actually the main site for network replenishment. This conclusion is based on the following observations in living cells synthesizing fluorescent keratin polypeptides: (1) Small keratin granules originate in close proximity to the plasma membrane and move toward the cell center in a continuous motion while elongating into flexible rod-like fragments which fuse with each other and integrate into the peripheral KF network. (2) Recurrence of fluorescence after photobleaching is first seen in the cell periphery where keratin filaments are born which translocate subsequently as part of the network toward the cell center. (3) Partial keratin network reformation after orthovanadate-induced disruption is restricted to a distinct peripheral zone in which either keratin granules or keratin filaments are transiently formed. These findings extend earlier investigations of mitotic cells in which de novo keratin network formation was shown to originate from the cell cortex. Taken together, our results demonstrate that the keratin filament system is not homogenous but is organized into temporally and spatially distinct subdomains. Furthermore, the cortical localization of the regulatory cues for keratin filament turnover provides an ideal way to adjust the epithelial cytoskeleton to dynamic cellular processes.
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