Antitumor activity of KW-2450 against triple-negative breast cancer by inhibiting Aurora A and B kinases

Kazuharu Kai, Kimie Kondo, Xiaoping Wang, Xuemei Xie, Mary K. Pitner, Monica E. Reyes, Angie M. Torres-Adorno, Hiroko Masuda, Gabriel N. Hortobagyi, Chandra Bartholomeusz, Hideyuki Saya, Debu Tripathy, Subrata Sen, Naoto T. Ueno

研究成果: Article査読

13 被引用数 (Scopus)


Currently, no targeted drug is available for triple-negative breast cancer (TNBC), an aggressive breast cancer that does not express estrogen receptor, progesterone receptor, or HER2. TNBC has high mitotic activity, and, because Aurora A and B mitotic kinases drive cell division and are overexpressed in tumors with a high mitotic index, we hypothesized that inhibiting Aurora A and B produces a significant antitumor effect in TNBC. We tested this hypothesis by determining the antitumor effects of KW- 2450, a multikinase inhibitor of both Aurora A and B kinases. We observed significant inhibitory activities of KW-2450 on cell viability, apoptosis, colony formation in agar, and mammosphere formation in TNBC cells. The growth of TNBC xenografts was significantly inhibited with KW-2450. In cell-cycle analysis, KW-2450 induced tetraploid accumulation followed by apoptosis or surviving octaploid (8N) cells, depending on dose. These phenotypes resembled those of Aurora B knockdown and complete pharmaceutical inhibition of Aurora A. We demonstrated that 8N cells resulting from KW-2450 treatment depended on the activation of mitogen-activated protein kinase kinase (MEK) for their survival. When treated with the MEK inhibitor selumetinib combined with KW-2450, compared with KW-2450 alone, the 8N cell population was significantly reduced and apoptosis was increased. Indeed, this combination showed synergistic antitumor effect in SUM149 TNBC xenografts. Collectively, Aurora A and B inhibition had a significant antitumor effect against TNBC, and this antitumor effect was maximized by the combination of selumetinib with Aurora A and B inhibition.

ジャーナルMolecular cancer therapeutics
出版ステータスPublished - 2015 12月 1

ASJC Scopus subject areas

  • 腫瘍学
  • 癌研究


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