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Cdc2 and Cdk2 play critical roles in low dose doxorubicin-induced cell death through mitotic catastrophe but not in high dose doxorubicin-induced apoptosis.

Park, SS; Eom, YW; Choi, KS
Biochemical and biophysical research communications, 334(4):1014-1021, 2005
Journal Title
Biochemical and biophysical research communications
In Huh-7 hepatoma cells, low dose (LD) doxorubicin treatment induces cell death through mitotic catastrophe accompanying the formation of large cells with multiple micronuclei, whereas high dose (HD) doxorubicin induces apoptosis. In this study, we investigated the role of Cdc2 and Cdk2 kinase in the regulation of the two modes of cell death induced by doxorubicin. During HD doxorubicin-induced apoptosis, the histone H1-associated activities of Cdc2 and Cdk2 both progressively declined in parallel with reductions in cyclin A and cyclin B protein levels. In contrast, during LD doxorubicin-induced cell death through mitotic catastrophe, the Cdc2 and Cdk2 kinases were transiently activated 1 day post-treatment, with similar changes seen in the protein levels of cyclin A, cyclin B, and Cdc2. Treatment with roscovitine, a specific inhibitor of Cdc2 and Cdk2, significantly blocked LD doxorubicin-induced mitotic catastrophe and cell death, but did not affect HD doxorubicin-induced apoptosis in Huh-7, SNU-398, and SNU-449 hepatoma cell lines. Our results demonstrate that differential regulation of Cdc2 and Cdk2 activity by different doses of doxorubicin may contribute to the induction of two distinct modes of cell death in hepatoma cells, either apoptosis or cell death through mitotic catastrophe.
MeSH terms
Antineoplastic Agents/administration & dosageApoptosis/drug effects*CDC2 Protein Kinase/metabolism*CDC2-CDC28 Kinases/metabolism*Carcinoma, Hepatocellular/metabolism*Carcinoma, Hepatocellular/pathology*Cell Line, TumorCyclin-Dependent Kinase 2Dose-Response Relationship, DrugDoxorubicin/administration & dosage*HumansLiver Neoplasms/metabolismLiver Neoplasms/pathologyMitosis/drug effects*
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Journal Papers > School of Medicine / Graduate School of Medicine > Biochemistry & Molecular Biology
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