K-TMZ is a DNA alkylating agent. It increases the concentration of O6-methylated deoxyguanosine in U87 glioblastoma multiforme (GBM) cells in a concentration-dependent manner. K-TMZ reduces cell viability of GBM cell lines lacking (IC50s = 18-44 μM) or expressing O6-methylguanine DNA methyltransferase (MGMT; IC50s = 115-240 μM). K-TMZ can cross the blood-brain barrier and increases survival in a Br23c mouse xenograft model of GBM when administered at a dose of 14.9 mg/kg.
ML-309 is an inhibitor of mutant isocitrate dehydrogenase 1 (IDH1). It reversibly and selective inhibits IDH1R132H over wild-type IDH1 (IC50s = 96 and 36,500 nM, respectively). ML-309 reduces 2-hydroxyglutarate production in U87MG glioblastoma cells (EC50 = 55 nM).
ML309 is a potent inhibitor of R132H mutant IDH1 capable of reducing 2-hydroxyglutarate production in U87MG glioblastoma cells. ML309 is capable of potent and selective inhibition of mutant IDH1 and effectively lowers cell-based production of 2-HG in a U87MG mutant glioblastoma cell line.
Arsthinol is an antiprotozoal agent which may have anti-cancer activity. It was found that arsthinol, a trivalent organoarsenic compound (dithiarsolane), has been active in vitro on leukemia cell lines and offers a better therapeutic index than arsenic trioxide, as estimated by the ratio LD50 IC50. Arsthinol induced growth inhibition of NB4 cells at lower concentration (IC50 (concentration inhibiting growth by 50%) = 0.78 + - 0.08 micromol l after 24 h) than As(2)O(3) (IC50 = 1.60 + - 0.23 micromol l after 24 h) or melarsoprol (IC50 = 1.44 + - 0.08 micromol l after 24 h). Arsthinol-cyclodextrin complex demonstrated to have was more effective than arsenic trioxide (As2O3) and melarsoprol on the U87MG cell line. Importantly, in the in vivo study, significant antitumor activity against heterotopic xenografts was observed after i.p. administration.