KA2507 hydrochloride (100-200 mg/kg; p.o.; daily; for 20 days) inhibits tumor growth in the syngeneic B16-F10 mouse melanoma model.
KA2507 hydrochloride also demonstrates antitumor efficacy in CT26 and MC38 colorectal cancer models.
Analysis of tumor samples also indicates modulation of biomarkers of antitumor immunity at efficacious dosing, with KA2507 hydrochloride administration resulting in reduced STAT3 activation (as measured by phospho-STAT3, an important suppressor of the antitumor immune response), reduced PD-L1 expression, and increased expression of MHC class I.
KA2507 hydrochloride exhibits poor oral bioavailability (mice 15%) and Cmax (mice 300 ng/mL) following oral administration (mice 200 mg/kg).
In Vitro
KA2507 hydrochloride does not inhibit the in vitro proliferation of mouse or human cancer cells at concentrations that are selective for HDAC6 inhibition. The anti-proliferative effects are only observed at high concentrations of KA2507 hydrochloride, which combines with the increased acetylation of histone H3 suggests that the anti-proliferative effects of KA2507 hydrochloride are attributable to off-target inhibition of class I HDAC as well as HDAC6.
Kinase Assay
Cell Assay
Animal Administration
References
[1]. Tsimberidou AM, et al. Preclinical Development and First-in-Human Study of KA2507, a Selective and Potent Inhibitor of Histone Deacetylase 6, for Patients with Refractory Solid Tumors.
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