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Raobaikady, B. et al.

Raobaikady, Purohit, Chander, Woo, Leese, Potter, Reed,

Inhibition of MCF-7 breast cancer cell proliferation and in vivo steroid sulphatase activity by 2-methoxyoestradiol-bis-sulphamate.

The endogenous oestrogen metabolite, 2-methoxyoestradiol (2-MeOE2) inhibits the growth of breast cancer cells and is also a potent anti-angiogenic agent. We have previously shown that the 3-sulphamoylated derivatives of 2-methoxyoestrogens are more potent than the non-sulphamoylated compounds. In this study, we have compared the abilities of 2-methoxyoestradiol-bis-sulphamate (2-MeOE2bisMATE) and 2-MeOE2 to inhibit the growth of MCF-7 breast cancer cells. Both compounds inhibited cell growth with the IC(50) for 2-MeOE2bisMATE (0.4 microM) being six-fold lower than that for 2-MeOE2 (2.5 microM). Oestrogen sulphamates are potent inhibitors of steroid sulphatase (STS) activity. 2-MeOE2bisMATE was found to retain its STS inhibitory activity and in a placental microsome assay system it was equipotent with oestrone-3-O-sulphamate (EMATE). An in vivo study was also carried out to compare the potency of 2-MeOE2bisMATE with that of EMATE and the non-steroidal STS inhibitor, 667 coumarin sulphamate (667 COUMATE). After a single oral dose (10mg/kg) some recovery of STS activity was detected by day 3 (10%) with activity partially restored (55%) by day 7 after administration of 667 COUMATE. For the other two steroidal compounds, STS activity remained almost completely inactivated for up to 5 days with complete restoration of activity occurring by day 15. The anti-proliferative and STS inhibitory properties of 2-MeOE2bisMATE suggest that it has considerable potential for development as a novel anti-cancer drug.[1]

References

Inhibition of MCF-7 breast cancer cell proliferation and in vivo steroid sulphatase activity by 2-methoxyoestradiol-bis-sulphamate. Raobaikady, B., Purohit, A., Chander, S.K., Woo, L.W., Leese, M.P., Potter, B.V., Reed, M.J. J. Steroid Biochem. Mol. Biol. (2003) [Pubmed]

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