SC144 (hydrochloride)

SC144 hydrochloride is a first-in-class, orally active gp130 (IL6-beta) inhibitor. SC144 hydrochloride binds gp130, induces gp130 phosphorylation (S782) and deglycosylation, abrogates Stat3 phosphorylation and nuclear translocation, and further inhibits the expression of downstream target genes. SC144 hydrochloride shows potent inhibition of gp130 ligand-triggered signaling. SC144 hydrochloride induces apoptosis in human ovarian cancer cells^[1]. In Vitro: SC144 inhibits cell growth in a panel of human ovarian cancer cell lines with IC₅₀s in a submicromolar range (IC₅₀=OVCAR-8, OVCAR-5, OVCAR-3= 0.72, 0.49, 0.95 μM)^[1].
The potency of SC144 toward NCI/ADR-RES (Paclitaxel- and Doxorubicin-resistant, IC₅₀=0.43 μM) and HEY (Cisplatin-resistant, IC₅₀=0.88 μM) suggests an ability to overcome drug resistance in ovarian cancer^[1].
SC144 (2 μM; 24 hours) causes significantly more apoptosis in OVCAR-8 and Caov-3 than normal kidney epithelial and normal endometrial cells^[1].
SC144 (0.5-2 μM; 0-6 hours) substantially increases the phosphorylation of gp130 (S782) in both OVCAR-8 and Caov-3 cells in a time- and dose-dependent manner^[1].
SC144 is cytotoxic to ovarian cancer cells via a mechanism involving the inhibition of gp130 activity, leading to the inactivation of Akt and Stat3 as well as the suppression of Stat3-regulated gene expression. As are result, SC144 treatment eventually causes cell-cycle arrest, anti-angiogenesis, and apoptosis^[1]. In Vivo: SC144 (10 mg/kg; i.p.; daily for 58 days) suppresses tumor growth in human ovariancancer xenografts^[1].
SC144 (100 mg/kg; p.o.; daily for 35 days) treatment shows the average tumor volume in mice 82% smaller than that in the control group^[1].