Se Hyang Hong, Jin Mo Ku, Sohyeon Kang, Kangwook Lee, Yui Sasaki, Seong-Gyu Ko, Chunhoo Cheon, Jihye Kim, Hyo In Kim, Youme Ko, Yu-Jeong Choi, Hye-Sook Seo, Ching-Wen Huang, Soo-Yeon Kang, Tai Young Kim, Yong Cheol Shin, and Myeong-Sun Kim
Taeumjowi-tang (TJ001) is a traditional Korean medicine that usually prescribed for Tae-um person to regulate stomach-related symptoms including headache, indigestion, and jaundice. Other studies on anti-obesity effect of TJ001 have also been researched, but have never been reported as a cure for cancer. In the present study, we investigated the molecular mechanism that TJ001 induces G2/M cell cycle arrest in DU145 (p53-mutant) prostate cancer cells. The missense mutation in human p53 gene (TP53) confers oncological effect to tumor suppressor p53-mutant protein. In prostate cancer, this gain-of-function of p53-mutant is associated with androgen-independence, increased angiogenesis, and metastasis. Our in vitro studies showed that a water extract of TJ001 induced G2/M cell cycle arrest via p53-mutant status and p21WAF/CIP1 up-regulation. Conventinally, p21WAF/CIP1 is induced by mediating p53 regulation, but, in experiments, handling the p53-dependent and -independent pathway. Although serine15-phosphorylated p53 and p53 proteins remained unchanged, p21WAF/CIP1 expression is induced and cyclin B1/Cdc2 complex is inactivated by a decrease of cyclin B1. In addition, in p53-independent pathway, the level of Cdc25C expression decreased and Serine-216 phosphorylated Cdc25C increased. Generally, concomitant with G2/M cell cycle arrest come the apoptosis cell death, but in the study, prolonged G2/M cell cycle arrest developed not apoptosis but cell senescence. Therefore, our data suggest that TJ001 is helpful for p53-mutant prostate cancer treatment. Citation Format: Soo-Yeon Kang, Hyo In Kim, Se Hyang Hong, Jin Mo Ku, Kangwook Lee, Myeong-Sun Kim, Yu-jeong Choi, Chunhoo Cheon, Youme Ko, Ching Wen Huang, Yui Sasaki, Sohyeon Kang, Hye-Sook Seo, Tai Young Kim, Ji Hye Kim, Yong Cheol Shin, Seong-Gyu Ko. Taeumjowi-tang (TJ001) induces G2/M cell cycle arrest but not apoptosis in p53-mutant prostate cancer via up-regulation of p21WAF/CIP1 [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2017; 2017 Apr 1-5; Washington, DC. Philadelphia (PA): AACR; Cancer Res 2017;77(13 Suppl):Abstract nr 300. doi:10.1158/1538-7445.AM2017-300