Purpose
The aim of the study is to suppress the progress of estrogen-dependent breast cancer by inhibiting the membrane transporter, which mediates the internalization of estrone-3-sulfate as estrogen precursor in the cancer cells.
Methods
The uptake of estrone-3-sulfate by estrogen-dependent breast cancer MCF-7 cells was measured, and inhibitory study using various organic anions on estrone-3-sulfate uptake by MCF-7 cells was conducted. The effects of the inhibitor on the transcription of reporter gene and cell proliferation induced by estrone-3-sulfate were examined.
Results
The uptake of estrone-3-sulfate by MCF-7 cells was saturable with Km value of 2.32 μM. The uptake was Na+-independent and was inhibited by several anionic compounds such as bromosulfophthalein. Bromosulfophthalein also significantly inhibited the transcription of reporter gene via estrogen response element and cell proliferation induced by estrone-3-sulfate. However, the transcriptional activation or cell proliferation induced by estrone was not inhibited by bromosulfophthalein. Reverse transcription–polymerase chain reaction analysis revealed the expression of mRNA of organic anion transporting polypeptide (OATP)-D and OATP-E as possible candidates to transport estrone-3-sulfate.
Conclusions
The uptake of estrone-3-sulfate is mediated by Na+-independent transporter(s). Inhibitor of estrone-3-sulfate transporter suppressed the transcription and cell proliferation induced by estrone-3-sulfate in MCF-7 cells. The results provide the basis of a novel strategy for breast cancer treatment by focusing on the transporter responsible for the uptake of estrone-3-sulfate.
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Abbreviations
- BSP:
-
bromosulfophthalein
- DCC:
-
dextran-coated charcoal
- DMSO:
-
dimethyl sulfoxide
- ER:
-
estrogen receptor
- ERE:
-
estrogen response element
- FCS:
-
fetal calf serum
- HEPES:
-
4-(2-hydroxyethyl)-1-piperazineethanesulfonic acid
- OAT:
-
organic anion transporter
- OATP:
-
organic anion transporting polypeptide
- SEAP:
-
secreted alkaline phosphatase
- SLC:
-
solute carrier family
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Nozawa, T., Suzuki, M., Yabuuchi, H. et al. Suppression of Cell Proliferation by Inhibition of Estrone-3-Sulfate Transporter in Estrogen-Dependent Breast Cancer Cells. Pharm Res 22, 1634–1641 (2005). https://doi.org/10.1007/s11095-005-7096-0
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DOI: https://doi.org/10.1007/s11095-005-7096-0