RKI-1447

Catalog No.S7195

RKI-1447 Chemical Structure

Molecular Weight(MW): 326.37

RKI-1447 is a potent inhibitor of ROCK1 and ROCK2, with IC50 of 14.5 nM and 6.2 nM, respectively, has anti-invasive and antitumor activities.

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2 Customer Reviews

  • (d) ROCK inhibition blocks CC-RCC migration in a transwell assay. RCC10 or 786-O cells were treated with Y-27632, RKI 1447 or DMSO vehicle (as indicated) for 6 h. The assay was performed in duplicate and the experiment was repeated three times. Statistical analysis in (b-d) was performed using a paired t-test comparing each normalized dose to the negative control (*P<0.05, **P<0.01 and ***P<0.001); s.e.m.'s are shown.

    Oncogene, 2016, 1-10.. RKI-1447 purchased from Selleck.

    The cells were treated with 5 μM of the PAK1-specific inhibitor IPA-3 or 1 μM of the ROCK1/2-specific inhibitor RKI-1447 for 24 h. Total cell lysates were immunoblotted with antibodies against p110β, p110δ, p-PAK1, PAK1, ROCK1, ROCK2, p-LIMK1, LIMK1 or β-actin, which served as an internal control. The results are representative of three independent experiments.

    Anticancer Res, 2017, 37(4):1805-1818. RKI-1447 purchased from Selleck.

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Biological Activity

Description RKI-1447 is a potent inhibitor of ROCK1 and ROCK2, with IC50 of 14.5 nM and 6.2 nM, respectively, has anti-invasive and antitumor activities.
Targets
ROCK2 [1]
(Cell-free assay)
ROCK1 [1]
(Cell-free assay)
6.2 nM 14.5 nM
In vitro

RKI-1447 is a cell-permeable pyridylthiazolyl-urea that acts as a potent, ATP site-targeting Rho Kinase inhibitor, displaying much reduced potency against PKA, PKN1/PRK1, p70S6K/RPS6kB1, AKT1, MRCKa/CDC42BPA (85.5%, 80.5%, 61.9%, 56.0%, and 50.4% inhibition, respectively, by 1 µM RKI-1447) or 15 other kinases. Crystal structures of the RKI-1447/ROCK1 complex reveals that RKI-1447 is a Type I kinase inhibitor that binds the ATP binding site through interactions with the hinge region and the DFG motif. RKI-1447 suppresses 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 μM. RKI-1447 is 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. RKI-1447 inhibits migration, invasion and anchorage-independent tumor growth of breast cancer cells. [1]

In vivo RKI-1447 is highly effective at inhibiting the outgrowth of mammary tumors in a transgenic mouse model. Tumors from mice treated with the RKI-1447 increases in size with an average percent change in tumor volume of only 8.8%. Thus, RKI-1447 inhibited mammary tumor growth by 87%, and on average the mammary tumors from Compared with those tumors from mice treated with the vehicle control, RKI-1447 treated mice are 7.7-fold smaller. RKI-1447 treatments does not result in mouse weight loss. [1]

Protocol

Kinase Assay:[2]
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Z-Lyte FRET kinase assay:

Kinase inhibition is measured using the Invitrogen Z-Lyte® FRET kinase assay with Ser/Thr 13 peptide substrate based on the myosin light chain sequence KKRPQRRYSNVF. Compounds are tested on three separate days with 8 point dilutions performed in duplicate to determine average IC50 values. The assay conditions are optimized to 15 μL of kinase reaction volume with 5 ng of enzyme in 50 mM HEPES (pH 7.5), 10 mM MgCl2, 1 mM EGTA, and 0.01% Brij-35. The reaction is incubated for 1 h at room temperature in the presence of 1.5 μM of peptide substrate with 12.5 μM of ATP (for ROCK1) or 2 μM of substrate with 50 μM of ATP (for ROCK2). The reaction is then stopped and the ratio of phosphorylated to unphosphorylated peptides is determined by selective cleavage of only the unphosphorylated peptide as described by the manufacturer. This is followed by excitation of coumarin at 400 nm resulting in emission at 445 nm and energy transfer to fluorescein and final emission at 520 nm. The substrate contains both coumarin and fluorescein and only uncleaved phosphorylated substrate will undergo FRET. The ratio of the signals at 445 nm and 520 nm is measured using a Wallac EnVision Plate Reader, model 2102 plate-reader.
Cell Research: [1]
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  • Cell lines: MDA-MB-231
  • Concentrations: ~600 μM
  • Incubation Time: 72 h
  • Method: Cells are plated in a 96 well tissue culture plate (1200 cells per well) and incubated for 24 hours. After incubation the cells are treated with vehicle or increasing concentrations of RKI-1447 for 72 hours. After incubation, freshly prepared MTT (2mg/ml) is added to each well and incubated for 3 hours. After incubation the plates are read at 540 nm.
    (Only for Reference)
Animal Research: [1]
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  • Animal Models: MMTV/neu transgenic mice [FVB/N-Tg (MMTVneu) 202 Mul/J]
  • Formulation: 20%-2-hydroxypropyl-betacyclodextrin(HPCD)
  • Dosages: 200 mpk/day
  • Administration: i.p.
    (Only for Reference)

Solubility (25°C)

In vitro DMSO 65 mg/mL (199.16 mM)
Water Insoluble
Ethanol Insoluble
In vivo Add solvents individually and in order:
15% Captisol
30 mg/mL

* Please note that Selleck tests the solubility of all compounds in-house, and the actual solubility may differ slightly from published values. This is normal and is due to slight batch-to-batch variations.

Chemical Information

Molecular Weight 326.37
Formula

C16H14N4O2S

CAS No. 1342278-01-6
Storage powder
Synonyms N/A

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Tech Support

Answers to questions you may have can be found in the inhibitor handling instructions. Topics include how to prepare stock solutions, how to store inhibitors, and issues that need special attention for cell-based assays and animal experiments.

Handling Instructions

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ROCK Signaling Pathway Map

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Cell Lines Assay Type Concentration Incubation Time Formulation Activity Description PMID