The novel compounds NSC745885 and NSC757963 developed at our laboratory were tested against a panel of 60 cancer cell lines at the National Cancer Institute, USA, and a panel of 39 cancer cell lines at the Japanese Foundation of Cancer Research. Both compounds demonstrated selective unique multi-log differential patterns of activity, with GI50 values in the sub-micro molar range against cancer cells rather than normal cardiac cells. NSC757963 showed high selectivity towards the leukemia subpanel. Activities of both compounds strongly correlated to expression of NFKB1 and CSNK2B genes, implying that they may inhibit the NF-κB pathway. Immunocytochemical microscopy of OVCAR-3 cells showed clear cytosolic accumulation of the NF-κB p65 subunit following treatment. Western blotting showed dose dependent inhibition of the nuclear expression of the NF-κB p65 subunit with subsequent accumulation in the cytosol following treatment. Docking experiments showed binding of both compounds to the NF-κB activator IKKβ subunit preventing its translocation to the nucleus. Collectively, these results confirm the ability of our compounds to inhibit the constitutively active NF-κB pathway of OVCAR-3 cells. Furthermore, COMPARE analysis indicated that the activity of NSC757963 is similar to the antituberculosis agent rifamycin SV, this was confirmed by testing the antimycobacterial activity of NSC757963 against Mycobacterium tuberculosis, results revealed potent activity suitable for use in clinical practice. Molecular properties and Lipinski’s parameters predicted acceptable bioavailability properties with no indication of mutagenicity, tumorigenicity, irritability and reproductive effects. Oral absorption experiments using the human Caco-2 model showed high intestinal absorption of NSC745885 by passive transport mechanism with no intestinal efflux or active transport mechanisms. The unique molecular characterization as well as the illustrated anticancer spectra of activity and bioavailability properties warrant further development of our compounds and present a foundation brick in the pre-clinical investigations to implement such compounds in clinical practice.
我们实验室开发的两种化合物NSC745885和NSC757963,在美国国立癌症研究所对60种癌
细胞系,以及日本癌症研究基
金会对39种癌
细胞系进行了测试。两种化合物都表现出独特的多对数活性差异模式,对癌细胞而非正常心脏细胞的GI50值在亚微摩尔范围内。NSC757963对白血病亚组显示出高度的选择性。这两种化合物的活性与NFKB1和CSNK2B
基因的表达强烈相关,这意味着它们可能抑制NF-κB通路。对O
VCAR-3细胞的免疫细胞
化学显微镜观察显示,治疗后NF-κB p65亚单位的细胞质积累明显。Western blotting显示,治疗后NF-κB p65亚单位的核表达受到剂量依赖性抑制,随后在细胞质中积累。对接实验显示,两种化合物都能与NF-κB激活子IKKβ亚单位结合,阻止其向核内转移。总的来说,这些结果证实了我们的化合物能够抑制O
VCAR-3细胞组成性激活的NF-κB通路。此外,COMPARE分析表明,NSC757963的活性与抗结核药
利福平SV相似,这通过测试NSC757963对结核分枝杆菌的抗分枝杆菌活性得到了证实,结果显示其具有适合临床实践的强大活性。分子特性和Lipinski参数预测了可接受的
生物利用度特性,没有显示出诱变性、致癌性、刺激性和生殖效应的迹象。使用人Caco-2模型的口服吸收实验显示,NSC745885通过被动转运机制在肠道中具有高吸收率,没有肠道流出或主动转运机制。独特的分子特性以及所示的抗癌活性和
生物利用度特性,使得我们的化合物值得进一步开发,并为临床实践中实施这些化合物奠定了基础。