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Design and synthesis of a C7-aryl piperlongumine derivative with potent antimicrotubule and mutant p53-reactivating properties.

Abstract：

:Small molecules that can restore biological function to the p53 mutants found in human cancers have been highly sought to increase the anticancer efficacy. In efforts to generate hybrid anticancer drugs that can impact two or more targets simultaneously, we designed and developed piperlongumine (PL) derivatives with an aryl group inserted at the C-7 position. This insertion bestowed a combretastatin A4 (CA4, an established microtubule disruptor) like structure while retaining the piperlongumine configuration. The new compounds exhibited potent antiproliferative activities against eight cancer cell lines, in particular, were more cytotoxic against the SKBR-3 breast cancer cells which harbor a R175H mutation in p53 suppressor. KSS-9, a representative aryl PL chosen for further studies induced abundant ROS generation and protein glutathionylation. KSS-9 strongly disrupted the tubulin polymerization in vitro, destabilized the microtubules in cells and induced a potent G2/M cell cycle block. More interestingly, KSS-9 showed the ability to reactivate the p53 mutation and restore biological activity to the R175H mutant protein present in SKBR3 cells. Several procedures, including immunocytochemistry using conformation-specific antibodies for p53, immunoprecipitation combined with western blotting, electrophoretic shift mobility shift assays showed a reciprocal loss of mutant protein and generation of wild-type like protein. p53 reactivation was accompanied by the induction of the target genes, MDM2, p21cip1 and PUMA. Mechanistically, the redox-perturbation in cancer cells by the hybrid drug appears to underlie the p53 reactivation process. This anticancer drug approach merits further development.

journal_name

Eur J Med Chem

journal_title

European journal of medicinal chemistry

authors

Punganuru SR,Madala HR,Venugopal SN,Samala R,Mikelis C,Srivenugopal KS

doi

10.1016/j.ejmech.2015.10.052

subject

Has Abstract

pub_date

2016-01-01 00:00:00

pages

233-44

eissn

0223-5234

issn

1768-3254

pii

S0223-5234(15)30334-2

journal_volume

107

pub_type

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Design and synthesis of a C7-aryl piperlongumine derivative with potent antimicrotubule and mutant p53-reactivating properties.