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Myriadenolide is a diterpene that we have recently isolated from the extract of Alomia myriadenia (Asteraceae). Here we show for the first time that myriadenolide has caspase-dependent cytotoxic activity against human leukemia cells from both lymphocytic (Jurkat) and monocytic (THP-1) lineages, because preincubation of Jurkat or THP-1 cells with the broad-spectrum caspase inhibitor z-VAD-fmk completely...
It has recently been proposed that doxorubicin (DOX) can induce apoptosis in human T-leukemia cells via the Fas/FasL system in an autocrine/paracrine way. We show here that treatment of Jurkat cells with either anti-Fas antibodies, anthracyclin drugs or actinomycin D induces the activation of CPP32 (caspase-3) and apoptosis. However, DOX treatment did not induce the expression of membrane FasL or...
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