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J Biol Chem, Vol. 273, Issue 51, 33942-33948, December 18, 1998
,
From the Different classes of anticancer drugs may trigger
apoptosis by acting on different subcellular targets and by
activating distinct signaling pathways. Here, we report that betulinic
acid (BetA) is a prototype cytotoxic agent that triggers apoptosis by a
direct effect on mitochondria. In isolated mitochondria, BetA directly induces loss of transmembrane potential independent of a
benzyloxycarbonyl-Val-Ala-Asp-fluoromethyl ketone-inhibitable caspase.
This is inhibited by bongkrekic acid, an agent that stabilizes the
permeability transition pore complex. Mitochondria undergoing
BetA-induced permeability transition mediate cleavage of caspase-8
(FLICE/MACH/Mch5) and caspase-3 (CPP32/Yama) in a cell-free system.
Soluble factors such as cytochrome c or apoptosis-inducing
factor released from BetA-treated mitochondria are sufficient for
cleavage of caspases and nuclear fragmentation. Addition of cytochrome
c to cytosolic extracts results in cleavage of caspase-3,
but not of caspase-8. However, supernatants of mitochondria, which have
undergone permeability transition, and partially purified apoptosis-inducing factor activate both caspase-8 and caspase-3 in
cytosolic extracts and suffice to activate recombinant caspase-8. These
findings show that induction of mitochondrial permeability transition
alone is sufficient to trigger the full apoptosis program and that some
cytotoxic drugs such as BetA may induce apoptosis via a direct effect
on mitochondria.
University Children's Hospital,
Prittwitzstrasse 43, D-89075 Ulm, Germany, the § Tumor
Immunology Program, German Cancer Research Center, Im Neuenheimer Feld
280, 69120 Heidelberg, Germany, and ¶ CNRS, Unité Propre de
Recherche 420, 19 rue Guy Môquet, Bureau de Poste 8, F-94801 Villejuif, France
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