期刊名称：Proceedings of the National Academy of Sciences
印刷版ISSN：0027-8424
电子版ISSN：1091-6490
出版年度：2005
卷号：102
期号：48
页码：17448-17453
DOI：10.1073/pnas.0508888102
语种：English
出版社：The National Academy of Sciences of the United States of America
摘要：Renal cell carcinomas (RCC) commonly retain wild-type but functionally inactive p53, which is repressed by an unknown dominant mechanism. To help reveal this mechanism, we screened a diverse chemical library for small molecules capable of restoring p53-dependent transactivation in RCC cells carrying a p53-responsive reporter. Among the compounds isolated were derivatives of 9-aminoacridine (9AA), including the antimalaria drug quinacrine, which strongly induced p53 function in RCC and other types of cancer cells. Induction of p53 by these compounds does not involve genotoxic stress and is mediated by suppression of NF-{kappa}B activity. In contrast to agents that target I{kappa}B kinase 2, 9AA and quinacrine can effectively suppress both basal and inducible activities of NF-{kappa}B, representing inhibitors of a previously undescribed type that convert NF-{kappa}B from a transactivator into a transrepressor, leading to accumulation of inactive nuclear complexes with unphosphorylated Ser-536 in the p65/RelA subunit. p53 function in RCC can be restored by ectopic expression of a superrepressor of I{kappa}B as effectively as by 9AA-derived compounds. These findings suggest that the complete or partial repression of p53 observed in many tumors can be the result of constitutive activation of NF-{kappa}B. The results demonstrate, in principle, the possibility to kill cancer cells selectively through simultaneous inhibition of NF-{kappa}B and activation of p53 by a single small molecule and suggest anticancer applications for the well known antimalaria drug quinacrine.
关键词：anticancer treatment ; apoptosis ; chemical library ; quinacrine
