260415-63-2

PD173955 is src family-selective tyrosine kinase inhibitor with IC50 of ~22 nM for Src, Yes and Abl kinase; less potent for FGFRα and no activity on InsR and PKC.IC50 value: 22 nMTarget: Src kinase inhibitorin vitro: PD173955 inhibits the growth of MDA-MB-468 and MCF-7 breast cancer cells with IC50s of 500 nM and 1 μM, respectively, with an accumulation of suspended cells. Cells treated with PD173955 show a near complete redistribution to the G2-M phase of the cell cycle in comparison with control cells, and quantitation of mitotic indices by immunofluorescence microscopy shows an accompanying accumulation of mitotic cells.PD173955 shows antimitotic activity in breast cancer cells with high or low src and yes kinase activities, the antimitotic activity of PD173955 is independent of cell type or malignant transformation [1]. PD173955 inhibits both the active and inactive forms of Abl. By contrast, Imatinib only inhibits the active form of the enzyme. In addition, the Ki for inhibition of Abl by PD173955 is very low, making it a more potent inhibitor of Abl and a more effective inhibitor of cancer cell proliferation than Imatinib [2]. PD173955, a Src family-specific tyrosine kinase inhibitor, increases the susceptibility of HT29 cells to anoikis in a dose- and time-dependent manner [3].