HDAC3 Inhibitor

HDAC3-IN-7 (Compound 8ae) is a selective HDAC3 inhibitor with an IC₅₀ value of 311 nM. HDAC3-IN-7 degrades PD-L1 through the lysosome pathway mediated by Cathepsin B, exerting activities such as inhibiting tumor cell proliferation, migration, and invasion. HDAC3-IN-7 is promising for research of cancers.

HDAC6-IN-74 is an orally active, selective histone deacetylase 6 (HDAC6) inhibitor with an IC₅₀ of 0.036 μM. HDAC6-IN-74 induces tumor cell apoptosis, arrests cells at the S phase of the cell cycle, and impairs cell migration, invasion and colony-forming abilities. HDAC6-IN-74 exerts anticancer effects with no obvious toxicity. HDAC6-IN-74 can be used in the research of cancers such as liver cancer.

HDAC-IN-89 is an inhibitor of HDAC1 (IC₅₀: 0.95 nM), HDAC2 (IC₅₀: 0.86 nM), HDAC3 (IC₅₀: 1.06 nM) and HDAC8 (IC₅₀: 4.24 nM). HDAC-IN-89 blocks the cell cycle and induces apoptosis. HDAC-IN-89 has anti-tumor activity.

PD-L1/HDAC-IN-1 (Compound 14) is the inhibitor for PD-L1 and HDAC that inhibits PD-1/PD-L1 interaction, HDAC2 and HDAC3 with IC₅₀ of 88.10, 27.98 and 14.47 nM, respectively. PD-L1/HDAC-IN-1 exhibits slight cytotoxicity in MCF-7 (IC₅₀=19.34 μM). PD-L1/HDAC-IN-1 upregulates the expression of PD-L1 and CXCL10, promoting anti-tumour immune response by recruiting T-cell infiltration into TME.

β-Hydroxymethyl chalcone is a time-dependent selective HDAC2 inhibitor, with IC₅₀ values of 0.17 μM (24 h) and 9.19 μM (1 h). After binding to the catalytic zinc ion in the active pocket of HDAC2, β-Hydroxymethyl chalcone undergoes an intramolecular nucleophilic attack to form a cyclic product, resulting in time-dependent tight binding. β-Hydroxymethyl chalcone can be used for the study of HDAC2 selective inhibition and related epigenetic targets^[1].

CRA-026440 is a potent, broad-spectrum HDAC inhibitor. The K_i values against recombinant HDAC isoenzymes HDAC1, HDAC2, HDAC3, HDAC6, HDAC8, and HDAC10 are 4, 14, 11, 15, 7, and 20 nM respectively. CRA-026440 shows antitumor and antiangiogenic activities. CRA-026440 is a click chemistry reagent, it contains an Alkyne group and can undergo copper-catalyzed azide-alkyne cycloaddition (CuAAc) with molecules containing Azide groups.