This Article Full Text Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Joung, K. E. Articles by Sheen, Y. Y. Search for Related Content PubMed PubMed Citation Articles by Joung, K. E. Articles by Sheen, Y. Y.

Potent In vivo Anti–Breast Cancer Activity of IN-2001, a Novel Inhibitor of Histone Deacetylase, in MMTV/c-Neu Mice

¹ College of Pharmacy, Ewha Womans University; ² Department of Pathology, College of Medicine, Hanyang University, Seoul, Korea

Requests for reprints: Yhun Yhong Sheen, College of Pharmacy, Ewha Womans University, 11-1 Daehyun-dong, Seodaemun-ku, Seoul 120-750, Korea. Phone: 82-2-3277-3028/3025; Fax: 82-2-3277-3028; E-mail: yysheen{at}ewha.ac.kr.

A novel synthetic inhibitor of histone deacetylase (HDAC), 3-(4-dimethylaminophenyl)-N-hydroxy-2-propenamide (IN-2001), was examined for its antitumor activity and for the underlying molecular mechanisms of any such activity. IN-2001 effectively inhibited cellular HDAC activity (IC₅₀, 5.42 nmol/L) in MCF-7 human breast cancer cells. Based on the Western blot analysis, this HDAC inhibitory effect of IN-2001 was confirmed by an increase in histone H4 acetylation from the IN-2001-treated breast cancer cells. IN-2001 suppressed mammary tumor growth in MMTV/c-Neu transgenic mice and also showed higher apoptotic index and lower lymphatic invasion compared with controls. In human breast cancer cells (MCF-7, T47D, MDA-MB-231, and MDA-MB-468), IN-2001 induced cell cycle arrest at G₂-M phase through up-regulation of p21^WAF1 and p27^KIP1 and eventually caused apoptosis. IN-2001-induced apoptosis was caspase dependent and seems mediated through an increase in Bax/Bcl-2 ratio. Taken together, our data indicate that this novel HDAC inhibitor is a promising therapeutic agent against human breast cancer. (Cancer es 2006; 66(10): 5394-402)