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J. Biol. Chem., Vol. 275, Issue 21, 16202-16212, May 26, 2000
From the Department of Pathology, State University of New York,
Stony Brook, New York 11794-8691
The mechanism of p53-mediated apoptosis after
cellular stress remains poorly understood. Evidence suggests that p53
induces cell death by a multitude of molecular pathways involving
activation of target genes and transcriptionally independent direct
signaling. Mitochondria play a key role in apoptosis. We show here that
a fraction of p53 protein localizes to mitochondria at the onset of
p53-dependent apoptosis but not during p53-independent
apoptosis or p53-mediated cell cycle arrest. The accumulation of p53 to mitochondria is rapid (within 1 h after p53 activation) and
precedes changes in mitochondrial membrane potential, cytochrome
c release, and procaspase-3 activation. Immunoelectron
microscopy and immuno-fluorescence-activated cell sorter analysis of
isolated mitochondria show that the majority of mitochondrial p53
localizes to the membranous compartment, whereas a fraction is found in
a complex with the mitochondrial import motor mt hsp70. After induction
of ectopic p53 without additional DNA damage in p53-deficient cells,
p53 again partially localizes to mitochondria, preceding the onset of
apoptosis. Overexpression of anti-apoptotic Bcl-2 or Bcl-xL abrogates
stress signal-mediated mitochondrial p53 accumulation and apoptosis but
not cell cycle arrest, suggesting a feedback signaling loop
between p53 and mitochondrial apoptotic regulators.
Importantly, bypassing the nucleus by targeting p53 to
mitochondria using import leader fusions is sufficient to induce
apoptosis in p53-deficient cells. We propose a model where p53 can
contribute to apoptosis by direct signaling at the mitochondria,
thereby amplifying the transcription-dependent apoptosis of p53.
Death Signal-induced Localization of p53 Protein to
Mitochondria
A POTENTIAL ROLE IN APOPTOTIC SIGNALING*
,
, and
*
This work was supported by grants from the National Cancer
Institute and the American Cancer Society.The costs of publication of this
article were defrayed in part by the
payment of page charges. The article
must therefore be hereby marked
"advertisement" in accordance with 18 U.S.C. Section
1734 solely to indicate this fact.
These authors contributed equally to the work.
§
To whom correspondence should be addressed. Tel.: 631-444-2459;
Fax: 631-444-3424; E-mail: umoll@path.som.sunysb.edu.
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