In vitro activity: TMP195 blocks the accumulation of CCL2 protein in the supernatants of monocyte-derived macrophage differentiation cultures. TMP195 significantly increases the amount of CCL1 protein secreted by the monocytes compared to vehicle group. In the transcriptional profiling data from the PHA-stimulated PBMC experiments, CCL2 and CCL1 are respectively down- or upregulated by TMP195 TMP195 occupies the acetyllysine-binding site of class IIa HDACs. TMP195 competes against binding of HDAC7 to a variety of side-chain modifications on the same peptide backbone, despite no interference with the activity of other acetyllysine reader proteins BRD4 (IC50>50 μM.

Kinase Assay: Recombinant HDAC7 catalytic domain (amino acids 483-903) is labeled with DyLight 650 and applied to an arrayed library of 3,868 immobilized 20-mer peptides. Arrays are conducted using an automated TECAN HS4 microarray processing station, initiated by incubation with blocking buffer for 30 min at 30°C followed by ishing with saline containing 50 mM Tris Base and 0.1% Tween-20 (pH 7.2) before incubation with the labeled HDAC7 protein for 120 min at 4°C. In the case of TMP195 competition experiments, the labeled protein is pre-incubated with TMP195 for 30 min before application to the array. The microarrays are then ished before being dried and imaged with an scanner.

Cell Assay: Monocytes were differentiated into antigen presenting cells in RPMI Medium 1640 supplemented with GlutaMAX fetal bovine serum (10% v/v), IL-4 (10 ng/ml), GM-CSF (50 ng/ml), penicillin (100 U/ml), and streptomycin (100 μg/ml) for 5 days in the presence of either 0.1% (v/v) DMSO or 300 nM TMP195. Cells were collected by washing and incubation with a solution of 5 mM EDTA in PBS (Ca2+/Mg2+-free), before flow cytometric analysis.

Nat Chem Biol. 2013 May;9(5):319-25; Nature. 2017 Mar 16;543(7645):428-432.