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• W2160734046 abstract "Doublecortin (DCX) and doublecortin-like kinase (DCLK), closely related family members, are microtubule-associated proteins with overlapping functions in both neuronal migration and axonal outgrowth. In growing axons, these proteins appear to have their primary functions in the growth cone. Here, we used siRNA to deplete these proteins from cultured rat sympathetic neurons. Normally, microtubules in the growth cone exhibit a gently curved contour as they extend from the base of the cone toward its periphery. However, following depletion of DCX and DCLK, microtubules throughout the growth cone become much more curvy, with many microtubules exhibiting multiple prominent bends over relatively short distances, creating a configuration that we termed wave-like folds. Microtubules with these folds appeared as if they were buckling in response to powerful forces. Indeed, inhibition of myosin-II, which generates forces on the actin cytoskeleton to push microtubules in the growth cone back toward the axonal shaft, significantly decreases the frequency of these wave-like folds. In addition, in the absence of DCX and DCLK, the depth of microtubule invasion into filopodia is reduced compared with controls, and at a functional level, growth cone responses to substrate guidance cues are altered. Conversely, overexpression of DCX results in microtubules that are straighter than usual, suggesting that higher levels of these proteins can enable an even greater resistance to folding. These findings support a role for DCX and DCLK in enabling microtubules to overcome retrograde actin-based forces, thereby facilitating the ability of the growth cone to carry out its crucial path-finding functions." @default.
• W2160734046 created "2016-06-24" @default.
• W2160734046 creator A5058434456 @default.
• W2160734046 creator A5072020119 @default.
• W2160734046 creator A5086707499 @default.
• W2160734046 date "2012-09-21" @default.
• W2160734046 modified "2023-09-25" @default.
• W2160734046 title "A novel role for doublecortin and doublecortin-like kinase in regulating growth cone microtubules" @default.
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• W2160734046 doi "https://doi.org/10.1093/hmg/dds395" @default.
• W2160734046 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3516135" @default.
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• W2160734046 hasPublicationYear "2012" @default.
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