Small-molecule Inducer of Cancer Cell Polyploidy Promotes Apoptosis or Senescence: Implications for Therapy

Christian Tovar, Brian Higgins, Dayanand Deo, Kenneth Kolinsky, Jin-Jun Liu, David C Heimbrook, Lyubomir T Vassilev

Cell Cycle. 2010 Aug 15;9(16):3364-75.

PMID: 20814247

Abstract:

Polyploidy results from deregulated cell division and has been considered an undesirable event leading to increased mutation rate and cancer development. However, polyploidy may also render cancer cells more vulnerable to chemotherapy. Here, we identify a small-molecule inducer of polyploidy, R1530, which interferes with tubulin polymerization and mitotic checkpoint function in cancer cells, leading to abortive mitosis, endoreduplication and polyploidy. In the presence of R1530, polyploid cancer cells underwent apoptosis or became senescent which translated into potent in vitro and in vivo efficacy. Normal proliferating cells were resistant to R1530-induced polyploidy thus supporting the rationale for cancer therapy by induced polyploidy. Mitotic checkpoint kinase BubR1 was found downregulated during R1530-induced exit from mitosis, a likely consequence of PLK4 inhibition. BubR1 knockdown in the presence of nocodazole induced an R1530-like phenotype, suggesting that BubR1 plays a key role in polyploidy induction by R1530 and could be exploited as a target for designing more specific polyploidy inducers.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP882531875	R1530		882531-87-5	Price