Scriptaid is a potent histone deacetylase (HDAC) inhibitor, used in cancer research. Scriptaid is also a sensitizer to antivirals and has potential for epstein-barr virus (EBV)-associated lymphomas treatment. IC50 & Target: HDAC^[1] In Vitro: Scriptaid (1 µg/mL) treatment inhibits cell growth in breast cancer cell lines, results in increased accumulation of both acetyl H3 and acetyl H4 proteins in MDA-MB-231, MDA-MB-435, and Hs578t cells. Scriptaid also inhibits cell growth of MDA-MB-231, MDA-MB-435, and Hs578t cell lines, with IC₅₀s of 0.5-1.0 µg/mL. Scriptaid (0.1-1.0 µg/mL) induces ER and PR mRNA expression in a dose dependent manner; when it is combined with AZA, they enhance ER expression and induce a functional ER protein^[1]. Scriptaid and SAHA preferentially inhibit the Class I histone deacetylases, hdac1, 2, and 3. Scriptaid is a potent anti-T. gondii compound with low cytotoxicity, and the IC₅₀ is 39 nM. Scriptaid has atypical effects in T. gondiiinfected HS68 cells^[2]. Scriptaid inhibits the growth of HeLa cells with IC₅₀ of 2 μM at 48 h in a dose-dependent manner. Scriptaid also affects cell-cycle and apoptosis^[3]. In Vivo: Scriptaid (3.5 µg/g mouse, i.p.) clearly inhibits tumor growth in a xenograft mouse model^[1].