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SI-2 targets the receptor-interacting domain (RID) of steroid receptor coactivators (SRCs) and suppresses cellular transcriptional activity (Effec. conc. >/= 5 nM in cell-based SRC-1, SRC-2, and SRC-3 reporter assays) by downregulating SRCs protein, but not transcript level (Effec. conc. >/= 12.5 nM against SRC-3, >/= 25 nM against SRC-1 and SCR-2 in MDA-MB-468 culture). SI-2 is cytotoxic to breast cancer cultures (IC50 = 1.5 nM/BT-474, 3.4 nM/MDA-MB-468, 22 nM/MCF-7), but not to normal hepatocytes even at 500 nM concentration. SI-2 is reported to be orally available in mice and, when administered intraperitoneally (2 mg/kg b.i.d.), effectively suppress MDA-MB-468-derived tumor expansion in mice in vivowith good pharmacokinetics (Cmax = 30 μM, tmax = 0.25 h, t1/2 = 1.0 h; 20 mg/kg i.p.) and no apparent adverse effects to the animals.
| Molecular Weight | 265.31 |
| Formula | C15H15N5 |
| CAS Number | 380537-35-9 |
| Solubility (25°C) | DMSO: 20 mg/mL |
| Storage |
Powder -20°C 3 years ; 4°C 2 years In solvent -80°C 6 months ; -20°C 1 month |
[1] Xiaoming Liu, et al. Biosafety evaluation of Li 2 Si 2 O 5 whisker-reinforced glass-ceramics
[2] Yubo Luo, et al. Thermoelectric Performance of the 2D Bi 2 Si 2 Te 6 Semiconductor
[5] Emilie B Guidez, et al. Why is Si 2 H 2 Not Linear? An Intrinsic Quasi-Atomic Bonding Analysis
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