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Zerumbone, a bioactive sesquiterpene, induces G2/M cell cycle arrest and apoptosis in leukemia cells via a Fas- and mitochondria-mediated pathway



Zerumbone, a bioactive sesquiterpene, induces G2/M cell cycle arrest and apoptosis in leukemia cells via a Fas- and mitochondria-mediated pathway



Cancer Science 98(1): 118-126



We demonstrated here for the first time that zerumbone (ZER), a natural cyclic sesquiterpene, significantly suppressed the proliferation of promyelocytic leukemia NB4 cells among several leukemia cell lines, but not human umbilical vein endothelial cells (HUVECs), by inducing G2/M cell cycle arrest followed by apoptosis with 10 microM of IC50. Treatment of NB4 cells with growth-suppressive concentrations of ZER resulted in G2/M cell cycle arrest that was associated with a decline of Cyclin B1 protein, but with the phosphorylation of ATM/ Chk1/Chk2. In addition, ZER induced the phosphorylation of Cdc25C at the Thr48 residue and Cdc2 at the Thr14/Tyr15 residues. Furthermore, ZER-induced apoptosis in NB4 cells was initiated by the expression of Fas (CD95)/Fas Ligand (CD95L), concomitant with the activation of caspase-8. ZER was also found to induce the cleavage of Bid, a mediator that is known to connect the Fas/CD95 cell death receptor to the mitochondrial apoptosis pathway. ZER also induced the cleavage of Bax and Mcl-1 proteins, but not Bcl-2 or Bcl-XL. ZER-induced apoptosis took place in association with a loss of the mitochondrial transmembrane potential as well as the activation of caspase-3 and -9, resulting in the degradation of the proteolytic poly (ADP-ribose) polymerase (PARP). ZER also triggered a release of cytochrome c into the cytoplasm. Both antagonistic anti-Fas antibody ZB4 and pan-caspase inhibitor Z-VAD inhibited ZER-induced apoptosis in NB4 cells. Taken together, ZER is an inducer of apoptosis in leukemic cells that specifically triggers the Fas/CD95- and mitochondria-mediated apoptotic signaling pathway.

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Accession: 012899597

Download citation: RISBibTeXText

PMID: 17129359

DOI: 10.1111/j.1349-7006.2006.00362.x


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