pubmed:abstractText |
Caspases are one of the key effector molecules in apoptosis. Caspase-3 activity (identified by cleavage of the peptide DEVD) was analysed in bone marrow blasts (minimum 70%) from 45 acute myeloid leukaemia (AML) patients. 12 patients (25%) exhibited high levels of specific DEVDase activity. These blast cells, despite having activated caspase-3, displayed none of the classical caspase-dependent morphological characteristics of apoptosis, such as degradation of DNA fragmentation factor 45, DNA fragmentation, and appeared to be more resistant to drug-induced apoptosis. Our results suggest that in these AML cells, resistance to apoptosis occurred downstream of caspase-3 activation.
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pubmed:affiliation |
INSERM U419, IFR 26, Centre Hospitalier Universitaire de Nantes, 9 Quai Moncousu, 44035 Nantes, France. loliver@nantes.inserm.fr
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