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Vol. 14, Issue 1, 78-92, January 2003




*Institute of Immunology, Medical Faculty Carl Gustav
Carus, Technical University Dresden, 01307 Dresden, Germany;
Survivin, a member of the inhibitor of apoptosis protein
family, has attracted growing attention due to its expression in various tumors and its potential application in tumor therapy. However,
its subcellular localization and function have remained controversial:
Recent studies revealed that survivin is localized at the mitotic
spindle, binds caspases, and could thus protect cells from apoptosis.
The cell cycle-dependent expression of survivin and its antiapoptotic
function led to the hypothesis that survivin connects the cell cycle
with apoptosis, thus providing a death switch for the termination of
defective mitosis. In other studies, survivin was detected at
kinetochores, cleavage furrow, and midbody, localizations
being characteristic for chromosomal passenger proteins. These proteins
are involved in cytokinesis as inferred from the observation that RNA
interference and expression of mutant proteins led to cytokinesis
defects without an increase in apoptosis. To remedy these
discrepancies, we analyzed the localizations of a survivinDsRed fusion
protein in HeLa cells by using confocal laser scanning microscopy and
time-lapse video imaging. SurvivinDsRed was excluded from the
interphase nucleus and was detected in centrosomes and at
kinetochores. It dissociated from chromosomes at the
anaphase/telophase transition and accumulated at the ends of polar
microtubuli where it was immediately condensed to the midbody.
Overexpression of both survivinDsRed and of a phosphorylation-defective
mutant conferred resistance against apoptosis-inducing reagents, but
only the overexpressed mutant protein caused an aberrant cytokinesis.
These data characterize in detail the dynamics of survivin in
vertebrate cells and confirm that survivin represents a chromosomal
passenger protein.
Department of Internal Medicine I, University
Hospital Carl Gustav Carus, Technical University Dresden, 01307 Dresden, Germany; §Institute of Anatomy, Medical
Faculty Carl Gustav Carus, Technical University Dresden, 01307 Dresden,
Germany;
Institute of Virology and Immunology,
University Wuerzburg, 97078 Wuerzburg, Germany; and
¶Department of Regulatory Radiobiology, Research
Institute for Radiation Biology and Medicine, Hiroshima University,
Hiroshima, Japan
Corresponding author. E-mail address:
temme{at}rcs.urz.tu-dresden.de.
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