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Published 5 December 2005. doi:10.1083/jcb.200507004
The Rockefeller University Press, 0021-9525 $8.00
JCB, Volume 171, Number 5, 893-904
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Article

 Subcellular targeting of oxidants during endothelial cell migration

Ru Feng Wu1, You Cheng Xu1, Zhenyi Ma1, Fiemu E. Nwariaku1, George A. Sarosi, Jr.1,2, and Lance S. Terada1,2

1 University of Texas Southwestern, Dallas, TX 75390
2 Dallas Veterans Administration Medical Center, Dallas, TX 75390

Correspondence to Lance S. Terada: Lance.Terada{at}med.va.gov

Endogenous oxidants participate in endothelial cell migration, suggesting that the enzymatic source of oxidants, like other proteins controlling cell migration, requires precise subcellular localization for spatial confinement of signaling effects. We found that the nicotinamide adenine dinucleotide phosphate reduced (NADPH) oxidase adaptor p47phox and its binding partner TRAF4 were sequestered within nascent, focal complexlike structures in the lamellae of motile endothelial cells. TRAF4 directly associated with the focal contact scaffold Hic-5, and the knockdown of either protein, disruption of the complex, or oxidant scavenging blocked cell migration. An active mutant of TRAF4 activated the NADPH oxidase downstream of the Rho GTPases and p21-activated kinase 1 (PAK1) and oxidatively modified the focal contact phosphatase PTP-PEST. The oxidase also functioned upstream of Rac1 activation, suggesting its participation in a positive feedback loop. Active TRAF4 initiated robust membrane ruffling through Rac1, PAK1, and the oxidase, whereas the knockdown of PTP-PEST increased ruffling independent of oxidase activation. Our data suggest that TRAF4 specifies a molecular address within focal complexes that is targeted for oxidative modification during cell migration.

Abbreviations used in this paper: 5'-IAF, 5'-iodoacetamidofluorescein; CRIB, Cdc42–Rac1 interaction binding; HUVEC, human umbilical vein endothelial cell; JNK, c-Jun NH2-terminal kinase; MOI, multiplicity of infection; PAK, p21-activated kinase; PID, PAK inhibitory domain; siRNA, short inhibitory RNA; TIRF, total internal reflection fluorescence.


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