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R306465

R306465 is a novel hydroxamate-based histone deacetylase (HDAC) inhibitor with broad-spectrum antitumour activity against solid and haematological malignancies in preclinical models. R306465 was found to be a potent inhibitor of HDAC1 and -8 (class I) in vitro. It rapidly induced histone 3 (H3) acetylation and strongly upregulated expression of p21waf1,cip1, a downstream component of HDAC1 signalling, in A2780 ovarian carcinoma cells. R306465 showed class I HDAC isotype selectivity as evidenced by poor inhibition of HDAC6 (class IIb) confirmed by the absence of downregulation of Hsp90 chaperone c-raf protein expression and tubulin acetylation. This distinguished it from other HDAC inhibitors currently in clinical development that were either more potent towards HDAC6 (e.g. vorinostat) or had a broader HDAC inhibition spectrum (e.g. panobinostat). R306465 potently inhibited cell proliferation of all main solid tumour indications, including ovarian, lung, colon, breast and prostate cancer cell lines, with IC50 values ranging from 30 to 300 nM. Haematological cell lines, including acute lymphoblastic leukaemia, acute myeloid leukaemia, chronic lymphoblastic leukaemia, chronic myeloid leukaemia, lymphoma and myeloma, were potently inhibited at a similar concentration range. R306465 induced apoptosis and inhibited angiogenesis in cell-based assays and had potent oral in vivo antitumoral activity in xenograft models. Once-daily oral administration of R306465 at well-tolerated doses inhibited the growth of A2780 ovarian, H460 lung and HCT116 colon carcinomas in immunodeficient mice. The high activity of R306465 in cell-based assays and in vivo after oral administration makes R306465 a promising novel antitumoral agent with potential applicability in a broad spectrum of human malignancies. see  British journal of cancer (2007), 97(10), 1344-53.

Current developer:    Johnson & Johnson Pharmaceutical Research & Development

 1. Angibaud, Patrick; Van Emelen, Kristof; Decrane, Laurence; van Brandt, Sven; ten Holte, Peter; Pilatte, Isabelle; Roux, Bruno; Poncelet, Virginie; Speybrouck, David; Queguiner, Laurence; Gaurrand, Sandrine; Marien, Ann; Floren, Wim; Janssen, Lut; Verdonck, Marc; van Dun, Jacky; van Gompel, Jacky; Gilissen, Ron; Mackie, Claire; Du Jardin, Marc; Peeters, Jozef; Noppe, Marc; Van Hijfte, Luc; Freyne, Eddy; Page, Martin; Janicot, Michel; Arts, Janine. Identification of a series of substituted 2-piperazinyl-5-pyrimidylhydroxamic acids as potent histone deacetylase inhibitors. Bioorganic & Medicinal Chemistry Letters (2010), 20(1), 294-298.

2. Brodie, Angela; Njar, Vincent C. O.; Sabnis, Gauri; Gediya, Lalji. HDAC inhibitors and hormone targeted drugs for the treatment of cancer. PCT Int. Appl. (2008), 96pp. CODEN: PIXXD2 WO 2008154402 A2 20081218

3. Arts, J.; Angibaud, P.; Marien, A.; Floren, W.; Janssens, B.; King, P.; van Dun, J.; Janssen, L.; Geerts, T.; Tuman, R. W.; Johnson, D. L.; Andries, L.; Jung, M.; Janicot, M.; van Emelen, K. R306465 is a novel potent inhibitor of class I histone deacetylases with broad-spectrum antitumoral activity against solid and hematological malignancies. British Journal of Cancer (2007), 97(10), 1344-1353.

4. Van Brandt, Sven Franciscus Anna; Van Emelen, Kristof; Angibaud, Patrick Rene; Marconnet-Decrane, Laurence Francoise Bernadette; Arts, Janine. Preparation of substituted propenyl piperazine derivatives as novel inhibitors of histone deacetylase. PCT Int. Appl. (2006), 67 pp. CODEN: PIXXD2 WO 2006010749 A2 20060202

5. Arts J; Angibaud P; Marien A; Floren W; Janssens B; King P; van Dun J; Janssen L; Geerts T; Tuman R W; Johnson D L; Andries L; Jung M; Janicot M; van Emelen K R306465 is a novel potent inhibitor of class I histone deacetylases with broad-spectrum antitumoral activity against solid and haematological malignancies. British journal of cancer (2007), 97(10), 1344-53.