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2014 ; 5
(6
): 527-41
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Cellular stress induces Bax-regulated nuclear bubble budding and rupture followed
by nuclear protein release
#MMPMID25482068
Lindenboim L
; Sasson T
; Worman HJ
; Borner C
; Stein R
Nucleus
2014[]; 5
(6
): 527-41
PMID25482068
show ga
Cellular stress triggers many pathways including nuclear protein redistribution.
We previously discovered that this process is regulated by Bax but the underlying
mechanism has not yet been studied. Here we define this mechanism by showing that
apoptotic stimuli cause Bax-regulated disturbances in lamin A/C and nuclear
envelope (NE)-associated proteins which results in the generation and subsequent
rupture of nuclear protein-containing bubbles. The bubbles do not contain DNA and
are encapsulated by impaired nuclear pore-depleted NE. Stress-induced generation
and rupture of nuclear bubbles ultimately leads to the discharge of nuclear
proteins into the cytoplasm. This process precedes morphological changes of
apoptosis and occurs independently of caspases. Rescue experiments revealed that
this Bax effect is non-canonical, i.e. it requires the BH3 domain and ?-helices 5
and 6 but it is not inhibited by Bcl(-)xL. Targeting Bax to the NE by the
Klarsicht/ANC-1/Syne-1 homology (KASH) domain effectively triggers the generation
and rupture of nuclear bubbles. Overall, our findings provide evidence for a
novel stress-response, which is regulated by a non-canonical action of Bax on the
NE.