Abstract
We recently found that a small molecule 2[[3-(2,3-dichlorophenoxy)propyl]amino]ethanol (2,3-DCPE) could induce apoptosis and downregulate Bcl-XL expression in various cancer cells. Here, we found that 2,3-DCPE suppressed the proliferation of Bcl-XL-overexpressing cancer cells without inducing apoptosis. Subsequently, we found that 2,3-DCPE could induce S-phase arrest and upregulate p21 but not p27 at a time- and dose-dependent but p53-dispensable manner in DLD-1 human colon cancer cells. Activation of ERK was also detected after treatment with 2,3-DCPE. Moreover, p21 induction was dramatically attenuated by ERK inhibitors PD98059 and U0126. Induction of p21 and S-phase arrest and corresponding activation of ERK were also observed in ATM-defective cells, suggesting that 2,3-DCPE-induced these events were ATM-dispensable. Furthermore, ERK inhibitors dramatically attenuated 2,3-DCPE-induced S-phase arrest. Together, our data indicate that ERK activation correlated with the 2,3-DCPE-mediated induction of p21 expression and S-phase arrest. This finding may have implication for cancer therapy.
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Abbreviations
- 2,3-DCPE:
-
2[[3-(2,3-dichlorophenoxy)propyl] amino] ethanol
- 2,3-DCEE:
-
2[[3-(2,3-dichlorophenoxy)ethyl]amino] ethanol
- DMSO:
-
dimethyl sulfoxide
- p21:
-
p21WAF1
- ERK:
-
extracellular signal-regulated kinase
- ATM:
-
ataxia telangiectasia-mutated
- PBST:
-
phosphate-buffered saline plus 0.05% Tween-20
- PCR:
-
polymerase chain reaction
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Acknowledgements
We thank David Galloway for editorial review and Jesse C Null for assistance in preparing the manuscript. This article represents partial fulfillment of the requirements for a PhD degree for JJD. This work was supported in part by grants from the National Cancer Institute (RO1 CA 092487-01A1 and RO1 CA 098582-01A1, to BF), a grant from The WM Keck Foundation, and a Core Grant from the National Institutes of Health (CA16672).
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Zhu, H., Zhang, L., Wu, S. et al. Induction of S-phase arrest and p21 overexpression by a small molecule 2[[3-(2,3-dichlorophenoxy)propyl] amino]ethanol in correlation with activation of ERK. Oncogene 23, 4984–4992 (2004). https://doi.org/10.1038/sj.onc.1207645
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DOI: https://doi.org/10.1038/sj.onc.1207645
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