1区 · 医学
Article
作者: Umehara, Takashi ; Fukami, Takehiro ; Washizuka, Kenichi ; Yashiroda, Yoko ; Mazaki, Yui ; Yuki, Hitomi ; Yoshida, Haruka ; Honma, Teruki ; Chikada, Tsubasa ; Niwa, Hideaki ; Sato, Shin ; Watanabe, Takashi ; Abe, Masako ; Okue, Masayuki ; Shirai, Fumiyuki ; Shirouzu, Mikako ; Muramatsu, Yukiko ; Kano, Yuko ; Tsumura, Takeshi ; Onuki, Tetsuo ; Yoshimoto, Nobuko ; Yoshida, Minoru ; Koda, Yasuko ; Koyama, Hiroo ; Kitamura, Kouichi ; Seimiya, Hiroyuki ; Mizutani, Anna ; Watanabe, Hirofumi ; Hirama, Chizuko ; Shitara, Eiki
The canonical WNT pathway plays an important role in cancer pathogenesis. Inhibition of poly(ADP-ribose) polymerase catalytic activity of the tankyrases (TNKS/TNKS2) has been reported to reduce the Wnt/β-catenin signal by preventing poly ADP-ribosylation-dependent degradation of AXIN, a negative regulator of Wnt/β-catenin signaling. With the goal of investigating the effects of tankyrase and Wnt pathway inhibition on tumor growth, we set out to find small-molecule inhibitors of TNKS/TNKS2 with suitable drug-like properties. Starting from 1a, a high-throughput screening hit, the spiroindoline derivative 40c (RK-287107) was discovered as a potent TNKS/TNKS2 inhibitor with >7000-fold selectivity against the PARP1 enzyme, which inhibits WNT-responsive TCF reporter activity and proliferation of human colorectal cancer cell line COLO-320DM. RK-287107 also demonstrated dose-dependent tumor growth inhibition in a mouse xenograft model. These observations suggest that RK-287107 is a promising lead compound for the development of novel tankyrase inhibitors as anticancer agents.