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Published online 13 January 2003. doi:10.1083/jcb.200207111
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© The Rockefeller University Press, 0021-9525/2003/1/235 $5.00
The Journal of Cell Biology, Volume 160, Number 2, 235-243


Article

Spatio-temporal activation of caspase revealed by indicator that is insensitive to environmental effects



Kiwamu Takemoto1,3, Takeharu Nagai2,4, Atsushi Miyawaki2 and Masayuki Miura1

1 Laboratory for Cell Recovery Mechanisms, Advanced Technology Development Center, RIKEN Brain Science Institute, Wako, Saitama 351-0198, Japan
2 Laboratory for Cell Function and Dynamics, Advanced Technology Development Center, RIKEN Brain Science Institute, Wako, Saitama 351-0198, Japan
3 Laboratories for Cell Biology and Neuroscience, Graduate School of Medicine, Osaka University, Suita, Osaka 565-0871, Japan
4 Structure and Function of Biomolecules, Precursory Research for Embryonic Science and Technology (PRESTO), Japan Science and Technology Corporation (JST), Nittochi 535, Akinono-cho, Nakagyo-ku, Kyoto 604-0847, Japan

Address correspondence to Masayuki Miura, Laboratory for Cell Recovery Mechanisms, RIKEN Brain Science Institute, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan. Tel.: 81-48-467-6945. Fax: 81-48-467-6946. E-mail: miura{at}brain.riken.go.jp

Indicator molecules for caspase-3 activation have been reported that use fluorescence resonance energy transfer (FRET) between an enhanced cyan fluorescent protein (the donor) and enhanced yellow fluorescent protein (EYFP; the acceptor). Because EYFP is highly sensitive to proton (H+) and chloride ion (Cl-) levels, which can change during apoptosis, this indicator's ability to trace the precise dynamics of caspase activation is limited, especially in vivo. Here, we generated an H+- and Cl--insensitive indicator for caspase activation, SCAT, in which EYFP was replaced with Venus, and monitored the spatio-temporal activation of caspases in living cells. Caspase-3 activation was initiated first in the cytosol and then in the nucleus, and rapidly reached maximum activation in 10 min or less. Furthermore, the nuclear activation of caspase-3 preceded the nuclear apoptotic morphological changes. In contrast, the completion of caspase-9 activation took much longer and its activation was attenuated in the nucleus. However, the time between the initiation of caspase-9 activation and the morphological changes was quite similar to that seen for caspase-3, indicating the activation of both caspases occurred essentially simultaneously during the initiation of apoptosis.

Key Words: FRET; caspase-3; caspase-9; nuclear activation of caspase-3; apoptosis


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