Abstract
The pharmacological inhibitors of extracellular signal-regulated kinase (ERK) have been suggested as a novel molecular target-based therapy for acute myeloid leukemia. Several studies have established the role of ERK in cell cycle progression from G1 to S phase in response to mitogen, but the role of ERK after the restriction point is less clarified. In this study, we used models of aphidicolin and nocodazole-synchronized HL-60 and NB4 leukemia cell lines to determine the kinetics of ERK activity during the progression of the cell cycle and to test the effects of commercially available inhibitors on G2/M progression of synchronized leukemia cells. In aphidicolin-synchronized cells, the activity of ERK was low during early S phase and increased at late S and G2/M phase of the cell cycle. The presence of MEK inhibitors PD 98059 and U0126 caused a delay in G2/M phase. In nocodazole-synchronized cells, the activity of ERK was low during M/G1 transition and MEK inhibitors had no effects on return of the cells to G1 phase. These results demonstrate that the activity of ERK is required during G2/M phase of leukemia cell cycle before the cells reach metaphase–anaphase transition.
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Acknowledgments
We thank Ms Zaklina Cavar for valuable technical help and assistance. This work was supported by the Ministry of Science, Education and Sport of the Republic of Croatia, grants No. 108-1081347-1448 (to D. V.) and 108-1081347-0173 (to H. B.).
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Matkovic, K., Lukinovic-Skudar, V., Banfic, H. et al. The activity of extracellular signal-regulated kinase is required during G2/M phase before metaphase–anaphase transition in synchronized leukemia cell lines. Int J Hematol 89, 159–166 (2009). https://doi.org/10.1007/s12185-008-0248-3
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DOI: https://doi.org/10.1007/s12185-008-0248-3