In vitro: Chidamide inhibits class I HDACs 1-3, as well as class IIb HDAC10, at low nanomolar concentrations. Chidamide significantly induces histone H3 acetylation in both HeLa human cervical adenocarcinoma cells and human PBMC. Cell growth inhibition studies performed with 18 human-derived tumor cell lines demonstrate that chidamide and MS-275 similarly inhibit the in vitro growth of most, but not all, tumor cells in the low micromolar concentration range. However, chidamide, and to a lesser extent MS-275, is significantly less toxic to normal cells from human fetal kidney (CCC-HEK) and liver (CCC-HEL), indicating a differential cytotoxic response of normal cells versus cancerous cells to chidamide.
In vivo: In HCT-8 colorectal carcinoma mice xenografts, Chidamide shows in vivo antitumor activity. Chidamide in the dose range of 12.5-50 mg/kg dose-dependently reduces tumor size and tumor weight, and the dose of 50 mg/kg produces similar or greater efficacy compared with the control drugs 5-fluorouracil(5-FU, 20 mg/kg) and MS-275 (25 mg/kg, which was reported as the maximum tolerated dose in xenograft models). However, chidamide is well-tolerated at the above doses in the tumor-bearing animals, whereas the control drugs cause significant weight loss.
|Cell lines||PBMC effector cells|
|Preparation method||Isolated PBMC effector cells are seeded into 6-well plates (6 x 106 cells/well) and treated with chidamide at different concentrations (0-400 nM) for different times (24-72 h).|
|Incubation time||24 h|
|Animal models||Athymic nude mice (BALB/c-nu)|
|Formulation||0.2% carboxymethyl cellulose (CMC) and 0.1% Tween 80|
|Body Surface Area (m2)||0.007||0.025||0.15||0.05||0.02||0.5|
|Animal A (mg/kg) = Animal B (mg/kg) multiplied by||Animal B Km|
|Animal A Km|
For example, to modify the dose of resveratrol used for a mouse (22.4 mg/kg) to a dose based on the BSA for a rat, multiply 22.4 mg/kg by the Km factor for a mouse and then divide by the Km factor for a rat. This calculation results in a rat equivalent dose for resveratrol of 11.2 mg/kg.
|Solubility||78 mg/mL in DMSO|
Results from a multicenter, open-label, pivotal phase II study of chidamide in relapsed or refractory peripheral T-cell lymphoma.
Shi Y, et al. Ann Oncol. 2015 Aug;26(8):1766-71. PMID: 26105599.
Non-toxic dose chidamide synergistically enhances platinum-induced DNA damage responses and apoptosis in Non-Small-Cell lung cancer cells.
Zhou Y, et al. Biomed Pharmacother. 2014 May;68(4):483-91. PMID: 24721323.
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ACY-738 is a potent, selective and orally-bioavailable HDAC6 inhibitor, with an IC50s of 1.7 nM.
HPOB is a highly potent and selective inhibitor of histone deacetylase 6 (HDAC6) with IC50 of 56 nM, >30 fold less potent against other HDACs.
HDAC8-IN-1 is a HDAC8 inhibitor with an IC50 of 27.2 nM in cancer cell lines.
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