Journal
ONCOGENE
Volume 23, Issue 29, Pages 4984-4992Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/sj.onc.1207645
Keywords
S-phase arrest; p21; ATM; p53; ERK; small molecule
Funding
- NCI NIH HHS [R01 CA 098582-01A1, CA16672, R01 CA 092487-01A1] Funding Source: Medline
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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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