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J. Cell Biol.,
Volume 139, Number 3, November 3, 1997 759-771
-Catenin

* Laboratorio Nazionale Consorzio Interuniversitario Biotecnologie AREA Science Park, 34142 Trieste, Italy; Cell death by apoptosis is a tightly regulated
process that requires coordinated modification in cellular architecture. The caspase protease family has been
shown to play a key role in apoptosis. Here we report
that specific and ordered changes in the actin cytoskeleton take place during apoptosis.
In this context, we have dissected one of the first hallmarks in cell death, represented by the severing of contacts among neighboring cells. More specifically, we
provide demonstration for the mechanism that could
contribute to the disassembly of cytoskeletal organization at cell-cell adhesion. In fact,
Cold Spring
Harbor Laboratory, Cold Spring Harbor, New York 11724; and § Dipartimento di Scienze e Tecnologie Biomediche, Sezione di
Biologia, Universita' di Udine, 33100 Udine, Italy
-catenin, a known
regulator of cell-cell adhesion, is proteolytically processed in different cell types after induction of apoptosis. Caspase-3 (cpp32/apopain/yama) cleaves in vitro
translated
-catenin into a form which is similar in size
to that observed in cells undergoing apoptosis.
-Catenin cleavage, during apoptosis in vivo and after caspase-3 treatment in vitro, removes the amino- and
carboxy-terminal regions of the protein. The resulting
-catenin product is unable to bind
-catenin that is
responsible for actin filament binding and organization.
This evidence indicates that connection with actin filaments organized at cell-cell contacts could be dismantled during apoptosis. Our observations suggest that
caspases orchestrate the specific and sequential
changes in the actin cytoskeleton occurring during cell
death via cleavage of different regulators of the microfilament system.
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