HS-173

HS-173 shows potent antiproliferative effects in T47D, SK-BR3, and MCF7 cells with IC50 of 0.6, 1.5, and 7.8 μM, respectively. ^[1] HS-173 causes complete suppression of the PI3K pathway in cancer cell lines (Hep3B and SkBr3). Moreover, HS-173 induces cell apoptosis by affecting cell-cycle distribution and activating caspases, and block VEGF-induced angiogenesis in vitro. ^[2]

HS-173 diminishes blood vessel formation in mice. ^[2] HS-173 markedly attenuates the development of liver fibrosis by blocking PI3K/Akt signaling in vivo. ^[4]

• PI3-Kinase assay

  The PI3K assay is performed using the Kinase-Glo Max luminescent kinase assay kit which quantifies the amount of ADP produced by the PI3K reaction. In brief, an active PI3K (100 ng) is preincubated with compound for 5 min in kinase reaction buffer (25 mM MOPS [pH 7.0], 5 mM MgCl₂, and 1 mM EGTA) and 10 μg l-α-phosphatidylinositol (PI). Before addition of PI, it is sonicated with sonication buffer (25 mM MOPS [pH 7.0], 1 mM EGTA) in water for 20 min for allowing miscelle formation. Then reaction is started by the addition of 10 μM ATP and ran for 180 min. To terminate kinase reaction, same volume of Kinase-Glo Max buffer is added. After 10 min, the plates are then read on a GloMax plate reader for luminescence detection.

• Cell lines

  T47D, SK-BR3, MCF7 cells

• Concentrations

  ~50 μM

• Incubation Time

  48 hours

• Method

  Cell viability is performed by a MTT assay. Briefly, T47D cells are plated in 96-well plates for 24 h. Then, the medium is removed and cells were treated with either DMSO as a control or various concentrations of inhibitors. The final concentration of DMSO in the medium was ≤0.1% (v/v). After the cells are incubated for 48 h, 20 μL MTT solution (5 mg/mL) is added to each well for another 4 h at 37 °C. The formazan crystals that formed are dissolved in DMSO (100 μL/well) by constant shaking for 5 min. The plate is then read on a microplate reader at 540 nm. Three replicate wells are used for each analysis. The median inhibitory concentration (IC50, defined as the drug concentration at which cell growth is inhibited by 50%) is assessed from the dose−response curves. To assess the effect of compounds on cell proliferation, T47D cells are cultured with compound (0.1−100 μM) for 48 h before MTT analysis.

• Animal Models

  Male BALB/c mice with CCl4-induced liver fibrosis

• Dosages

  ~20 mg/kg

• Administration

  p.o.