Biochem/physiol Actions
Potent dual BET/HDAC inhibitory (+)-JQ1 and CI994 hybrid with higher antiproliferation activty than (+)-JQ1 and/or CI994 in cancer cultures.
TW9 is a potent dual BET/HDAC inhibitory hybrid composed of the BET proteins BRD2/3/4/6 inhibitor (+)-JQ1 and the HDAC1/3 inhibitor CI994. TW9 has similar BRD4 affinity as (+)-JQ1 (BD1/BD2 Kd by ITC = 69/231 nM for TW9, 51/89 nM for JQ1; BD1/BD2/full-length IC50 by NonoBRET 720/74/640 nM for TW9, 231/39/104 nM for JQ1), while being more potent than CI994 against HDAC1 (IC50 = 290 nM/TW9, 960 nM/CI994). TW9 exhibits higher antiproliferation activty than (+)-JQ1 and/or CI994 in cancer cultures (0.05-2 µM; MIA PaCa-2, DAN-G, HPAC).