RKI-1447 is a potent and selective ROCK inhibitor with significant anti-invasive and antitumor activities. RKI-1447 binds the ATP binding site through interactions with the hinge region and the DFG motif. RKI-1447 inhibited migration, invasion and anchorage-independent tumor growth of breast cancer cells. RKI-1447 was also highly selective at inhibiting ROCK-mediated cytoskeleton re-organization (actin stress fiber formation) following LPA stimulation, but does not affect PAK-meditated lamellipodia and filopodia formation following PDGF and Bradykinin stimulation, respectively. RKI-1447 suppressed phosphorylation of the ROCK substrates MLC-2 and MYPT-1 in human cancer cells, but had no effect on the phosphorylation levels of the AKT, MEK and S6 kinase at concentrations as high as 10 μmol/L. Finally, RKI-1447 was highly effective at inhibiting the outgrowth of mammary tumors in a transgenic mouse model.
|Source||Neoplasia (2018). Figure 7. RKI-1447|
|Method||3D spheroid invasion assays|
|Cell Lines||MSC-4H-FC cells|
|Incubation Time||24 h|
|Results||Importantly, concentrations of RKI-1447 as low as 0.5 μM were able to completely abolish the invasion of MSC-4H-FC 3D spheroids and to significantly reduce cell extravasation out of the CAM vasculature without having any relevant effect on cell proliferation.|
|Body Surface Area (m2)||0.007||0.025||0.15||0.05||0.02||0.5|
|Animal A (mg/kg) = Animal B (mg/kg) multiplied by||Animal B Km|
|Animal A Km|
For example, to modify the dose of resveratrol used for a mouse (22.4 mg/kg) to a dose based on the BSA for a rat, multiply 22.4 mg/kg by the Km factor for a mouse and then divide by the Km factor for a rat. This calculation results in a rat equivalent dose for resveratrol of 11.2 mg/kg.
RKI-1447 is a potent inhibitor of the Rho-associated ROCK kinases with anti-invasive and antitumor activities in breast cancer.
Patel RA, et al. Cancer Res. 2012 Oct 1;72(19):5025-34. PMID: 22846914.
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