Kinase-Dependent Mechanism Frizzled3- and c-Jun N-Terminal Outgrowth in Ewing Tumor Cells via a Wnt-3a and Dickkopf-1 Stimulate Neurite
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Wnt-3a and Dickkopf-1 stimulate neurite outgrowth in Ewing tumor cells via a Frizzled3- and c-Jun N-terminal kinase-dependent mechanism.
Recombinant Wnt-3a stimulated the rapid formation of elongated processes in Ewing sarcoma family tumor (ESFT) cells that were identified as neurites. The processes stained positively for polymerized actin and microtubules as well as synapsin I and growth-associated protein 43. Inhibition of the Wnt receptor, Frizzled3 (Fzd3), with antiserum or by short interfering RNA (siRNA) markedly reduced n...
متن کاملCasein kinase 1 delta functions at the centrosome to mediate Wnt-3a–dependent neurite outgrowth
Previously we determined that Dishevelled-2/3 (Dvl) mediate Wnt-3a-dependent neurite outgrowth in Ewing sarcoma family tumor cells. Here we report that neurite extension was associated with Dvl phosphorylation and that both were inhibited by the casein kinase 1 (CK1) δ/ε inhibitor IC261. Small interfering RNAs targeting either CK1δ or CK1ε decreased Dvl phosphorylation, but only knockdown of CK...
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Dvl is a key protein that transmits the Wnt signal to the canonical beta-catenin pathway and the noncanonical planar cell polarity (PCP) pathway. We studied the roles of Rho-associated kinase (Rho-kinase), which is activated by Dvl in the PCP pathway of mammalian cells. The expression of Dvl-1, Wnt-1, or Wnt-3a activated Rho-kinase in COS cells, and this activation was inhibited by the Rho-bind...
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متن کاملAtypical protein kinase Cι is required for Wnt3a-dependent neurite outgrowth and binds to phosphorylated dishevelled 2.
Previously we reported that Wnt3a-dependent neurite outgrowth in Ewing sarcoma family tumor cell lines was mediated by Frizzled3, Dishevelled (Dvl), and c-Jun N-terminal kinase (Endo, Y., Beauchamp, E., Woods, D., Taylor, W. G., Toretsky, J. A., Uren, A., and Rubin, J. S. (2008) Mol. Cell. Biol. 28, 2368-2379). Subsequently, we observed that Dvl2/3 phosphorylation correlated with neurite outgro...
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