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Erschienen in: Breast Cancer Research and Treatment 2/2007

01.12.2007 | Preclinical Type

A novel steroidal selective steroid sulfatase inhibitor KW-2581 inhibits sulfated-estrogen dependent growth of breast cancer cells in vitro and in animal models

verfasst von: Hiroyuki Ishida, Taisuke Nakata, Masayo Suzuki, Yukimasa Shiotsu, Hideyuki Tanaka, Natsuko Sato, Yoko Terasaki, Miho Takebayashi, Hideharu Anazawa, Chikara Murakata, Pui-Kai Li, Takashi Kuwabara, Shiro Akinaga

Erschienen in: Breast Cancer Research and Treatment | Ausgabe 2/2007

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Abstract

We screened a series of 17β-(N-alkylcarbamoyl)-estra-1,3,5(10)trine-3-O-sulfamate derivatives, and describe here a potent and selective steroid sulfatase (STS) inhibitor with antitumor effects in breast cancer models in vitro and in vivo. In biochemical assays using crude enzymes isolated from recombinant Chinese hamster ovary cells expressing human arylsulfatses (ARSs), one of the best compounds, KW-2581, inhibited STS activity with an IC50 of 4.0 nM, while > 1000-fold higher concentrations were required to inhibit the other ARSs. The failure to stimulate the growth of MCF-7 human breast cancer cells as well as in uteri in ovariectomized rats indicated the lack of estrogenicity of this compound. In MCF-7 cells transfected with the STS gene, termed MCS-2 cells, KW-2581 inhibited the growth of cells stimulated by estrone sulfate (E1S) but also 5-androstene-3β, 17β-diol 3-sulfate (ADIOLS) and dehydroepiandrostenedione 3-sulfate. We found that oral administration of KW-2581 inhibited both E1S- and ADIOLS-stimulated growth of MCS-2 cells in a mouse hollow fiber model. In a nitrosomethylurea-induced rat mammary tumor model, KW-2581 induced regression of E1S-stimulated tumor growth as effectively as tamoxifen or another STS inhibitor, 667 Coumate. Dose-response studies in the same rat model demonstrated that more than 90% inhibition of STS activity in tumors was necessary to induce tumor shrinkage. STS activity in tumors has well correlated with that in leukocytes, suggesting that STS activity in leukocytes could be used as an easily detectable pharmacodynamic marker. These findings demonstrate that KW-2581 is a candidate for development as a therapeutic agent for the treatment of hormone receptors-positive breast cancer.
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Metadaten
Titel
A novel steroidal selective steroid sulfatase inhibitor KW-2581 inhibits sulfated-estrogen dependent growth of breast cancer cells in vitro and in animal models
verfasst von
Hiroyuki Ishida
Taisuke Nakata
Masayo Suzuki
Yukimasa Shiotsu
Hideyuki Tanaka
Natsuko Sato
Yoko Terasaki
Miho Takebayashi
Hideharu Anazawa
Chikara Murakata
Pui-Kai Li
Takashi Kuwabara
Shiro Akinaga
Publikationsdatum
01.12.2007
Verlag
Springer US
Erschienen in
Breast Cancer Research and Treatment / Ausgabe 2/2007
Print ISSN: 0167-6806
Elektronische ISSN: 1573-7217
DOI
https://doi.org/10.1007/s10549-007-9495-x

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