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2016 ; 2
(ä): 15066-
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Cdk2 phosphorylation of Bcl-xL after stress converts it to a pro-apoptotic
protein mimicking Bax/Bak
#MMPMID27226901
Megyesi J
; Tarcsafalvi A
; Seng N
; Hodeify R
; Price PM
Cell Death Discov
2016[]; 2
(ä): 15066-
PMID27226901
show ga
Apoptosis is a regulated form of cell death that proceeds by defined biochemical
pathways. Most apoptosis is controlled by interactions between pro-survival and
pro-apoptotic Bcl-2 family proteins in which death is often the consequence of
permeabilization of the mitochondrial outer membrane. Many drugs affect this
equilibrium to favor apoptosis but this process is not completely understood. We
show that the chemotherapeutic drug cisplatin initiates an apoptotic pathway by
phosphorylation of a pro-survival Bcl-2 family member, Bcl-xL, by
cyclin-dependent kinase 2. The phosphorylation occurred at a previously
unreported site and its biologic significance was demonstrated by a
phosphomimetic modification of Bcl-xL that was able to induce apoptosis without
addition of cisplatin. The mechanism of cell death induction was similar to that
initiated by pro-apoptotic Bcl-2 family proteins, that is, phosphorylated Bcl-xL
translocated to the mitochondrial membrane, and formed pores in the membrane.
This initiated cytochrome c release and caspase activation that resulted in cell
death.