Background:

Belinostat (also known as PXD101) is a novel and potent hydroxamate-type inhibitor of histone deacetylase (HDAC) that inhibits the activity of HDAC in Hela cell extracts with 50% inhibition concentration IC₅₀value of 27 nM. Belinostat has been found to significantly increase the acetylation of histones H3 and H4 and exerts cytotoxicity in a wide range of tumor cell lines. In the treatment of urothelial carcinoma cell lines, belinostat dose-dependently inhibits proliferation in 5637, T24, J82 and RT4 cells with IC₅₀values of 1.0 μM, 3.5 μM, 6.0 μM and 10 μM respectively; while, in prostate cancer cell lines, it inhibits cancer cell growth with IC₅₀values ranging from 0.5 to 2.5 μM.

Reference

Michael T Buckley, Joanne Yoon, Herman Yee, Luis Chiriboga, Leonard Liebes, Gulshan Ara, Xiaozhong Qian, Dean F Bajorin, Tung-Tien Sun, Xue-Ru Wu and Iman Osman. The histone deacetylase inhibitor belinostat (PXD101) suppresses bladder cancer cell growth in vitro and in vivo. Journal of Translational Medicine 2007; 5:49

Giovanni Luca Gravina, Francesco Marampon, Ilaria Giusti, Eleonora Carosa, Stefania Di Sante, Enrico Ricevuto, Vincenza Dolo, Vincenzo Tombolini, Emmanuele A Jannini and Claudio Festuccia. Differential effects of PXD101 (belinostat) on androgen-dependent and androgen-independent prostate cancer models. International Journal of Oncology 40: 711-720, 2012

Plumb JA, Finn PW, Williams RJ, Bandara MJ, Romero MR, Watkins CJ, La Thangue NB, Brown R. Pharmacodynamic response and inhibition of growth of human tumor xenografts by the novel histone deacetylase inhibitor PXD101. Mol Cancer Ther. 2003 Aug;2(8):721-8.