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Kim, Jun-Sub; Huang, Timothy Y; Bokoch, Gary M
Molecular biology of the cell 20, Številka: 11Journal Article
Cellular stimuli generate reactive oxygen species (ROS) via the local action of NADPH oxidases (Nox) to modulate cytoskeletal organization and cell migration through unknown mechanisms. Cofilin is a major regulator of cellular actin dynamics whose activity is controlled by phosphorylation/dephosphorylation at Ser3. Here we show that Slingshot-1L (SSH-1L), a selective cofilin regulatory phosphatase, is involved in H(2)O(2)-induced cofilin dephosphorylation and activation. SSH-1L is activated by its release from a regulatory complex with 14-3-3zeta protein through the redox-mediated oxidation of 14-3-3zeta by H(2)O(2). The ROS-dependent activation of the SSH-1L-cofilin pathway stimulates the SSH-1L-dependent formation of cofilin-actin rods in cofilin-GFP-expressing HeLa cells. Similarly, the formation of endogenous ROS stimulated by angiotensin II (AngII) also activates the SSH-1L-cofilin pathway via oxidation of 14-3-3zeta to increase AngII-induced membrane ruffling and cell motility. These results suggest that the formation of ROS by NADPH oxidases engages a SSH-1L-cofilin pathway to regulate cytoskeletal organization and cell migration.
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