PMID: 10805935May 11, 2000

Flow cytometry detection of caspase 3 activation in preapoptotic leukemic cells

F BellocF Lacombe


Procaspase 3 is a constitutive proenzyme that is activated by cleavage during apoptosis. The resulting enzyme is able to cleave several target proteins after the second aspartate of a DEVD sequence common to all the substrates of caspases 3 and 7 (DEVDase). Because active caspase 3 is a common effector in several apoptotic pathways, it may be a good marker to detect (pre-)apoptotic cells by flow cytometry (FCM). Materials and Methods Apoptosis was induced in U937 or bone marrow mononuclear cells by daunorubicin (DNR), idarubicin (IDA), or camptothecin (CAM). Viable and apoptotic cells were sorted by FCM on the basis of either fluorescein isothiocyante (FITC)-annexin V binding or DiOC6(3) accumulation. DEVDase activity was measured in sorted populations by spectrofluorometry. Cleaved caspase 3 was labeled in situ with phycoerythrin (PE)-conjugated anti-activated caspase 3 antibodies and analyzed by FCM. DEVDase activity was detected in sorted viable CAM- and DNR-treated U937 cells, demonstrating that a partial caspase activation occurred earlier than phosphatidyl-serine exposure and mitochondrial membrane potential dissipation. The presence of a low amount of active caspase 3 in the treated viable cells was confirmed in situ wit...Continue Reading


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