Gene/Protein Disease Symptom Drug Enzyme Compound
Pivot Concepts:   Target Concepts:
Query: EC:5.99.1.3 (topoisomerase)
 9,911 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Ellipticine, a cytotoxic plant alkaloid, is known to inhibit topoisomerase II. Here, we first report the molecular mechanism of ellipticine's apoptotic action in human breast MCF-7 cancer cells. Treatment of cells with ellipticine resulted in inhibition of growth, and G2/M phase arrest of the cell cycle. This effect was associated with a marked increase in the protein expression of p53 and, p21/WAF1 and KIP1/p27, but not of WAF1/p21. Ellipticine treatment increased the expression of Fas/APO-1 and its ligands, mFas ligand and sFas ligand, and subsequent activation of caspase-8. The mitochondrial apoptotic pathway amplified the Fas/Fas ligand death receptor pathway by Bid interaction. This effect was found to result in a significant increase in activation of caspase-9. Taken together, we have concluded that the molecular mechanisms during ellipticine-mediated growth inhibition and induction of apoptosis in MCF-7 cells were due to (1) cell cycle arrest and induction of apoptosis, (2) induction of p53 and KIP1/p27 expression, (3) triggering of Fas/Fas ligand pathway, (4) disruption of mitochondrial function, and (5) the apoptotic signaling was amplified by cross-talk between Fas death receptor and mitochondrial apoptotic pathway.
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PMID:The mechanism of ellipticine-induced apoptosis and cell cycle arrest in human breast MCF-7 cancer cells. 1589 64