Kotomolide A arrests cell cycle progression and induces apoptosis through the induction of ATM/p53 and the initiation of mitochondrial system in human non-small cell lung cancer A549 cells.
This study first investigates the anticancer effect of kotomolide A (KTA) in human non-small cell lung cancer cells, A549. KTA has exhibited effective cell growth inhibition by inducing cancer cells to undergo G2/M phase arrest and apoptosis. Blockade of cell cycle was associated with increased the activation of ataxia telangiectasia-mutated (ATM). Activation of ATM by KTA phosphorylated p53 at Serine15, resulting in increased stability of p53 by decreasing p53 and murine double minute-2 (MDM2) interaction. In addition, KTA-mediated G2/M phase arrest also was associated with the decrease in the amounts of cyclinB1, cyclinA, Cdc2 and Cdc25C and increase in the phosphorylation of Chk2, Cdc25C and Cdc2. Specific ATM inhibitor, caffeine, significantly decreased KTA-mediated G2/M arrest by inhibiting the phosphorylation of p53 (Serine15) and Chk2. KTA treatment triggered the mitochondrial apoptotic pathway indicated by a change in Bax/Bcl-2 ratios, resulting in mitochondrial membrane potential loss and caspase-9 activation. Taken together, these results suggest a critical role for ATM and p53 in KTA-induced G2/M arrest and apoptosis of human non-small cell lung cancer cells.
School of Medicine and Health Sciences, Fooyin University, Kaohsiung, Taiwan.
Chung-Yi
CY
Chen
Ya-Ling
YL
Hsu
Yu-Chieh
YC
Tsai
Po-Lin
PL
Kuo
D015107:4-Butyrolactone / Q000031:analogs & derivatives* / Q000494:pharmacology; D000818:Animals; D000972:Antineoplastic Agents, Phytogenic / Q000494:pharmacology*; D017209:Apoptosis / Q000187:drug effects*; D064007:Ataxia Telangiectasia Mutated Proteins; D016203:CDC2 Protein Kinase; D053453:Caspase 9 / Q000378:metabolism; D002453:Cell Cycle / Q000187:drug effects*; D018797:Cell Cycle Proteins / Q000378:metabolism*; D019925:Cyclin A / Q000378:metabolism; D019926:Cyclin B / Q000378:metabolism; D056744:Cyclin B1; D018844:Cyclin-Dependent Kinases; D004268:DNA-Binding Proteins / Q000378:metabolism*; D004305:Dose-Response Relationship, Drug; D006801:Humans; D051379:Mice; D008928:Mitochondria / Q000187:drug effects / Q000502:physiology; D010766:Phosphorylation; D017346:Protein Serine-Threonine Kinases / Q000378:metabolism*; D019253:Proto-Oncogene Proteins c-bcl-2 / Q000378:metabolism; D014407:Tumor Cells, Cultured; D016159:Tumor Suppressor Protein p53 / Q000378:metabolism*; D025521:Tumor Suppressor Proteins / Q000378:metabolism*; D020687:cdc25 Phosphatases / Q000378:metabolism
D000972:Antineoplastic Agents, Phytogenic; C534699:CCNB1 protein, human; C534700:Ccnb1 protein, mouse; D018797:Cell Cycle Proteins; D019925:Cyclin A; D019926:Cyclin B; D056744:Cyclin B1; D004268:DNA-Binding Proteins; D019253:Proto-Oncogene Proteins c-bcl-2; D016159:Tumor Suppressor Protein p53; D025521:Tumor Suppressor Proteins; C512093:kotomolide A; C576324:ATM protein, human; D064007:Ataxia Telangiectasia Mutated Proteins; C576325:Atm protein, mouse; D017346:Protein Serine-Threonine Kinases; D016203:CDC2 Protein Kinase; C528899:CDK1 protein, human; D018844:Cyclin-Dependent Kinases; C517009:CDC25C protein, human; D020687:cdc25 Phosphatases; D053453:Caspase 9; D015107:4-Butyrolactone