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Microtubule-mediated NF-kappaB activation in the TNF-alpha signaling pathway.

Abstract：

:The microtubule cytoskeleton is known to play a role in cell structure and serve as a scaffold for a variety of active molecules in processes as diverse as motility and cell division. The literature on the role of microtubules in signal transduction, however, is marked by inconsistencies. We have investigated a well-studied signaling pathway, TNF-alpha-induced NF-kappaB activation, and found a connection between the stability of microtubules and the regulation of NF-kappaB signaling in C2C12 myotubes. When microtubules are stabilized by paclitaxel (taxol), there is a strong induction of NF-kappaB even in the absence of TNF-alpha . Although there was no additive effect of taxol and TNF-alpha on NF-kappaB activity suggesting a shared mechanism of activation, taxol strongly induced the NF-kappaB reporter in the presence of a TNF receptor (TNFR) blocking antibody while TNF-alpha did not. Both TNF-alpha and taxol induce the degradation of endogenous IkappaBalpha and either taxol or TNF-alpha induction of NF-kappaB activity was blocked by inhibitors of NF-kappaB acting at different sites in the signaling pathway. Both TNF-alpha and taxol strongly induce known NF-kappaB chemokine target genes. On the other hand, if microtubules are destabilized by colchicine, then the induction of NF-kappaB by TNF-alpha or taxol is greatly reduced. Taken together, we surmise that the activity of microtubules is at the level of the TNFR intracellular domain. This phenomenon may indicate a new level of signaling organization in cell biology, actively created by the state of the cytoskeleton, and has ramifications for therapies where microtubule regulating drugs are used.

journal_name

Exp Cell Res

journal_title

Experimental cell research

authors

Jackman RW,Rhoads MG,Cornwell E,Kandarian SC

doi

10.1016/j.yexcr.2009.08.020

subject

Has Abstract

pub_date

2009-11-15 00:00:00

pages

3242-9

issue

19

eissn

0014-4827

issn

1090-2422

pii

S0014-4827(09)00373-5

journal_volume

315

pub_type

杂志文章

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