Abstract
In the previous study, we demonstrated the involvement of dual specificity phosphatase 22 (DUSP22/LMW-DSP2) in regulating the leukemia inhibitory factor/interleukin-6/signal transducer and activator of transcription 3-mediated signaling pathway. In this study, we show β-estradiol (E2)-induced DUSP22 mRNA expression in estrogen receptor α (ERα)-positive breast cancer cells, whereas E2-induced phosphorylation and activation of ERα was suppressed by overexpression of DUSP22 but not catalytically inactive mutants. Furthermore, small-interfering RNA-mediated reduction of DUSP22 expression enhanced ERα-mediated transcription and endogenous gene expression. In fact, DUSP22 associated with ERα in vivo and both endogenous proteins interacted in ERα-positive breast cancer T47D cells. These results strongly suggest that DUSP22 acts as a negative regulator of the ERα-mediated signaling pathway.
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Abbreviations
- DUSP:
-
dual specificity phosphatase
- ER:
-
estrogen receptor
- E2:
-
β-estradiol
- GST:
-
glutathione-S-transferase
- LMW-DSP:
-
low molecular weight-dual specificity phosphatase
- LUC:
-
luciferase
- PCR:
-
polymerase chain reaction
- RT:
-
reverse transcription
- siRNA:
-
small interfering RNA
- STAT:
-
signal transducer and activator of transcription
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Acknowledgements
This study was supported in part by Industrial Technology Research Grant Program in 2005 from New Energy and Industrial Technology Development organization (NEDO) of Japan.
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Sekine, Y., Ikeda, O., Hayakawa, Y. et al. DUSP22/LMW-DSP2 regulates estrogen receptor-α-mediated signaling through dephosphorylation of Ser-118. Oncogene 26, 6038–6049 (2007). https://doi.org/10.1038/sj.onc.1210426
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DOI: https://doi.org/10.1038/sj.onc.1210426
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