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2015 ; 6
(18
): 16287-303
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Ubiquitin C-terminal hydrolase-L1 increases cancer cell invasion by modulating
hydrogen peroxide generated via NADPH oxidase 4
#MMPMID25915537
Kim HJ
; Magesh V
; Lee JJ
; Kim S
; Knaus UG
; Lee KJ
Oncotarget
2015[Jun]; 6
(18
): 16287-303
PMID25915537
show ga
This study explored the role of ubiquitin C-terminal hydrolase-L1 (UCH-L1) in the
production of ROS and tumor invasion. UCH-L1 was found to increase cellular ROS
levels and promote cell invasion. Silencing UCH-L1, as well as inhibition of H2O2
generation by catalase or by DPI, a NOX inhibitor, suppressed the migration
potential of B16F10 cells, indicating that UCH-L1 promotes cell migration by
up-regulating H2O2 generation. Silencing NOX4, which generates H2O2, with siRNA
eliminated the effect of UCH-L1 on cell migration. On the other hand, NOX4
overexpressed in HeLa cells happens to be ubiquitinated, and NOX4 following
deubiquitination by UCH-L1, restored H2O2-generating activity. These in vitro
findings are consistent with the results obtained in vivo with catalase (-/-)
C57BL/6J mice. When H2O2 and UCH-L1 levels were independently varied in these
animals, the former by infecting with H2O2-scavenging adenovirus-catalase, and
the latter by overexpressing or silencing UCH-L1, pulmonary metastasis of B16F10
cells overexpressing UCH-L1 increased significantly in catalase (-/-) mice. In
contrast, invasion did not increase when UCH-L1 was silenced in the B16F10 cells.
These findings indicate that H2O2 levels regulated by UCH-L1 are necessary for
cell invasion to occur and demonstrate that UCH-L1 promotes cell invasion by
up-regulating H2O2 via deubiquitination of NOX4.