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2016 ; 35
(35
): 4580-90
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Caspases uncouple p27(Kip1) from cell cycle regulated degradation and abolish its
ability to stimulate cell migration and invasion
#MMPMID26829051
Podmirseg SR
; Jäkel H
; Ranches GD
; Kullmann MK
; Sohm B
; Villunger A
; Lindner H
; Hengst L
Oncogene
2016[Sep]; 35
(35
): 4580-90
PMID26829051
show ga
In addition to their role in programmed cell death, caspases exert non-lethal
functions in diverse developmental processes including cell differentiation or
tissue remodeling. Terminal cell cycle exit and differentiation can be promoted
by increased level of the CDK inhibitor p27(Kip1). Activated caspases cause
proteolytic processing of p27, and we identified a novel caspase cleavage site in
human p27 that removes a C-terminal fragment of 22 amino acids from the CDK
inhibitor, including a phosphodegron. Thereby, caspases protect the inhibitor
from SCF-Skp2-mediated degradation in S, G2 and M phases of the cell cycle. As a
consequence, p27 becomes stabilized and remains an efficient nuclear inhibitor of
cell cycle progression. Besides controlling cyclin/CDK kinase activity, p27 also
regulates cytoskeletal dynamics, cell motility and cell invasion. Following
processing by caspases, p27 fails to bind to RhoA and to inhibit its activation,
and thereby abolishes the ability of p27 to stimulate cell migration and
invasion. We propose that the stabilization of the CDK inhibitor and elimination
of RhoA-induced cytoskeletal remodeling upon caspase processing could contribute
to cell cycle exit and cytoskeletal remodeling during non-lethal caspase
controlled differentiation processes.