作者:Christopher P. Landowski、Katrin A. Bolanz、Yoshiro Suzuki、Matthias A. Hediger
DOI:10.1007/s11095-010-0249-9
日期:2011.2
Calcium entry channels in the plasma membrane are thought to play a major role in maintaining cellular Ca2+ levels, crucial for growth and survival of normal and cancer cells. The calcium-selective channel TRPV6 is expressed in prostate, breast, and other cancer cells. Its expression coincides with cancer progression, suggesting that it drives cancer cell growth. However, no specific inhibitors for TRPV6 have been identified thus far. To develop specific TRPV6 inhibitors, we synthesized molecules based on the lead compound TH-1177, reported to inhibit calcium entry channels in prostate cancer cells in vitro and in vivo. We found that one of our compounds (#03) selectively inhibited TRPV6 over five times better than TRPV5, whereas TH-1177 and the other synthesized compounds preferentially inhibited TRPV5. The IC50 value for growth inhibition by blocking endogenous Ca2+ entry channels in the LNCaP human prostate cancer cell line was 0.44 ± 0.07 μM compared to TH-1177 (50 ± 0.4 μM). These results suggest that compound #03 is a relatively selective and potent inhibitor for TRPV6 and that it is an interesting lead compound for the treatment of prostate cancer and other cancers of epithelial origin.
质膜上的钙离子通道被认为在维持细胞 Ca2+ 浓度方面发挥着重要作用,而 Ca2+ 浓度对正常细胞和癌细胞的生长和存活至关重要。钙选择性通道 TRPV6 在前列腺癌、乳腺癌和其他癌细胞中都有表达。它的表达与癌症进展相吻合,这表明它能驱动癌细胞生长。然而,迄今为止尚未发现针对 TRPV6 的特异性抑制剂。为了开发特异性 TRPV6 抑制剂,我们合成了以先导化合物 TH-1177 为基础的分子,据报道,TH-1177 可在体外和体内抑制前列腺癌细胞中的钙离子通道。我们发现,我们的一种化合物(03 号)对 TRPV6 的选择性抑制作用是 TRPV5 的五倍以上,而 TH-1177 和其他合成化合物则优先抑制 TRPV5。在 LNCaP 人类前列腺癌细胞系中,通过阻断内源性 Ca2+ 进入通道抑制生长的 IC50 值为 0.44 ± 0.07 μM ,而 TH-1177 为 50 ± 0.4 μM。这些结果表明,03 号化合物是一种对 TRPV6 具有相对选择性的强效抑制剂,是治疗前列腺癌和其他上皮源性癌症的一种有趣的先导化合物。