4-[2-[5,6-二氢-5,5-二甲基-8-(4-甲基苯基)-2-萘基]乙炔基]苯甲酸

Kd: 2 nM (RARα), 2 nM (RARβ), 3 nM (RARγ)

AGN 193109 is a highly effective antagonist of retinoic acid receptors, with K _d s of 2 nM, 2 nM, and 3 nM for RARα, RARβ, and RARγ, respectively. AGN 193109 is completely RAR specific, because it does not bind to or transactivate through any of the RXRs. AGN 193109 (100 nM) inhibits the TTNPB (a retinoic acid receptor agonist)-dependent morphological change in ECE16-1 cells. AGN193109 half-reverses retinoid-dependent growth suppression at 10 nM, and completely shows this effect at 100 nM in ECE16-1 cells. AGN193109 (100 nM) also eliminates TTNPB-induced decrease in levels of K5, K6, K14, K16, and K17 and increase in levels of K7, K8, and K19.

AGN 193109 (1.15 μmol/kg) does not causes overt toxicity and has no effect on spleen weight on the mice, but it suppresses TTNPB-induced increase in spleen weight of the mice. AGN 193109 also significantly reduces the cutaneous toxicity induced by ATRA. AGN 193109 (0.30 or 1.20 μmol/kg) by topical treatment significantly reduces both weight loss and cutaneous toxicity caused by oral TTNPB cotreatment.