Rapid caspase-3 activation during apoptosis revealed using fluorescence-resonance energy transfer.
Caspase-3 is a crucial component of the apoptotic machinery in many cell types. Here, we report the timescale of caspase-3 activation in single living cells undergoing apoptosis. This was achieved by measuring the extent of fluorescence resonance energy transfer within a recombinant substrate containing cyan fluorescent protein (CFP) linked by a short peptide possessing the caspase-3 cleavage sequence, DEVD, to yellow fluorescent protein (YFP; i.e. CFP-DEVD-YFP). We demonstrate that, once initiated, the activation of caspase-3 is a very rapid process, taking 5 min or less to reach completion. Furthermore, this process occurs almost simultaneously with a depolarization of the mitochondrial membrane potential. These events occur just prior to the characteristic morphological changes associated with apoptosis. Our results clearly demonstrate that, once initiated, the commitment of cells to apoptosis is a remarkably rapid event when visualized at the single cell level.
Department of Biochemistry, School of Medical Sciences, University of Bristol, UK.
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Tyas
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Brophy
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Pope
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Rivett
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Tavaré
D000818:Animals; D017209:Apoptosis; D019556:COS Cells; D053148:Caspase 3; D020169:Caspases / Q000378:metabolism*; D004789:Enzyme Activation; D007700:Kinetics; D008564:Membrane Potentials; D008856:Microscopy, Fluorescence; D008928:Mitochondria / Q000378:metabolism; D010446:Peptide Fragments / Q000235:genetics / Q000378:metabolism; D011065:Poly(ADP-ribose) Polymerases / Q000378:metabolism; D011993:Recombinant Fusion Proteins / Q000235:genetics / Q000378:metabolism; D013050:Spectrometry, Fluorescence; D019311:Staurosporine / Q000494:pharmacology; D014162:Transfection
D010446:Peptide Fragments; D011993:Recombinant Fusion Proteins; D011065:Poly(ADP-ribose) Polymerases; D053148:Caspase 3; D020169:Caspases; D019311:Staurosporine