In vitro study | PP2(5 μm) acts on NIH3T3 and NIH-RET/PTC3 cell lysates to inhibit phosphorylation and signaling of RET/PTC1 tumor protein in vivo. PP2(5 μm) acts on NIH3T3 fibroblasts transforming RET/PTC1, and two human papillary thyroid carcinoma cell lines TPC1 and FB2 carrying spontaneous RET/PTC1 rearrangements, inhibits serum-independent growth. PP2 (5 μm) inhibited TPC1 cell type I collagen matrix invasion. PP2 inhibits Src by binding to a region of the molecule that does not overlap with the ATP binding domain. PP2(20 μm) inhibited HT29 cell growth by 40-50%. After 1 hour of treatment, this concentration reduced Src activity and maintained a 35% inhibition of Src activity for 2 days. PP2(100 mM) decreased Src activity in HT29 cells in a dose-dependent manner. PP2(1 mM-100 mM) inhibits human colon cancer cells (HT29, SW480, and PMCO1), hepatoma cells (PLC/PRF/5, KYN-2, Li7, and HepG2), and growth of breast cancer cells (MCF-7, MDA-MB-468, and BT-474) in a dose-dependent manner. PP2(20 μm) significantly promoted the polymerization of most cancer cells (HT29, SW480, PMCO1, PLC/PRF/5, KYN-2, Li7, MCF-7, and MDA-MB-468), this effect is E-cadherin dependent. PP2(20 μm) acts on cancer cells, enhances E-cadherin expression, and strongly promotes the Association of E-cadherin with the actin cytoskeleton. PP2(20 μm) acts on HT29 cells to enhance α-catenin, β-catenin, And γ-catenin expression, while acting on PLC/PRF/5 and MCF-7 cells, the total protein level of α-catenin did not change, but the levels of β-catenin and γ-catenin increased slightly. PP2 inhibited the proliferation of two cervical cancer cells (HeLa and SiHa) in a time-and dose-dependent manner. PP2(10 μm) acts on HeLa and SiHa cells to down-regulate pSrc-Y416, pEGFR-Y845, and-Y1173 expression levels. PP2(10 μm) upregulated p21(Cip1) and p27(Kip1) in HeLa and SiHa cells, and downregulated cyclin A and cyclin-dependent kinase -2 in HeLa cells,-4 (Cdk-2,-4) expression, and down-regulation of cyclin B and Cdk-2 expression in SiHa cells, can regulate cell cycle arrest. |