GSK461364

Catalog No.S2193 Batch:S219303

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Technical Data

Formula

C27H28F3N5O2S

Molecular Weight 543.6 CAS No. 929095-18-1
Solubility (25°C)* In vitro Ethanol 100 mg/mL (183.95 mM)
DMSO 55 mg/mL (101.17 mM)
Water Insoluble
* <1 mg/ml means slightly soluble or insoluble.
* 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.
* Room temperature shipping (Stability testing shows this product can be shipped without any cooling measures.)

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Biological Activity

Description GSK461364 (GSK461364A) inhibits purified Plk1 with Ki of 2.2 nM in a cell-free assay. It is more than 1000-fold selective against Plk2/3.
Targets
PLK1 [1]
(Cell-free assay)
2.2 nM(Ki)
In vitro

GSK461364 inhibits cancer cell line proliferation from multiple origins with minimal toxicity in nondividing human cells. [1] RNA silencing of WT p53 increases the antiproliferative activity of GSK461364. As many cancer therapies tend to be more effective in p53 WT patients, the higher sensitivity of p53-deficient tumors toward GSK461364 could potentially offer an opportunity to treat tumors that are refractory to other chemotherapies as well as early line therapy for these genotypes. GSK461364 is a thiophene amide that inhibits purified Plk1 enzyme in vitro with a Ki of 2 nM and has >100-fold selectivity for Plk1 compared with Plk2 and Plk3. GSK461364 is a potent inhibitor of cell proliferation causing 50% growth inhibition (GI50) below 100 nM in most of the cell lines tested with limited toxicity against human nonproliferating cells. Inhibition of cell cycle progression is concentration dependent with initial delay at G2 phase at high GSK461364 concentrations and arrest at M phase at lower concentrations. Currently, GSK461364 is in a dose-escalation first-time-in-human trial. Cell lines with mutations in the TP53 gene tended to be more sensitive to GSK461364, and that inhibiting the p53 response by RNA silencing confers increased sensitivity in some p53 wild-type (WT) cells. Furthermore, these more sensitive cell lines also have increased levels of chromosome instability, a characteristic associated with TP53 mutations. [2] In preclinical testing, GSK461364 shows antiproliferative activity against multiple (>120) tumor cell lines and potently inhibits the proliferation of greater than 83% and 91% of these cell lines, with IC50 values lower than 50 and 100 nM, respectively. [3]

In vivo

Cell culture growth inhibition by GSK461364 can be cytostatic or cytotoxic but leads to tumor regression in xenograft tumor models under proper dose scheduling. GSK461364 shows clear antitumor activity in human tumor xenograft models. [1] GSK461364 shows a dose-dependent mitotic arrest in mouse xenografts, which correlates with effects on tumor growth. [2] Intraperitoneal administration of GSK461364 causes regression or tumor growth delay in different xenograft models, including Colo205 xenografts. Suppression of Plk1 in vivo by using GSK461364 results in mitotic arrest with aberrant mitotic figures consisting of monopolar or collapsed mitotic spindles. [3]

Features Demonstrates >390-fold selectivity for Plk1 relative to Plk2 and Plk3.

Protocol (from reference)

Kinase Assay:

[1]

  • Enzyme assays

    Kinase reactions are performed in a final assay volume of 10 μL using the Z-Lyte Assay kit (Ser/Thr peptide 16). Briefly, reactions contains 50 mM HEPES (pH 7.5), 10 mM MgCl2, 1 mM EGTA, 1 mM DTT, 0.01% Brij 35, 0.01 mg/mL casein, 200 μM ATP, 200 μM Polo Box peptide (NH2-MAGPMQS[pT]PLNGAKK-OH), and 6 nM recombinant Plk1 (H6-tev-PLK 1-603). Plk1 is preincubated for 60 minutes with 0 to 1 μM GSK461364. Reactions are then initiated by the addition of 2 μM peptide. After 15 minutes at 23 °C, reactions are quenched and processed according the Z′-Lyte protocol and read on an EnVision plate reader. Raw fluorescence values are converted to concentration of product formed using substrate and product standards. Because the potency of inhibition for GSK461364 is observed to vary as a function of the ATP concentration in a manner consistent with an ATP-competitive mode of inhibition, an upper limit for the Ki for GSK461364 is determined.

Cell Assay:

[2]

  • Cell lines

    Prostate(LNCap,PC3), Cervix(HeLa), Pancreas(ASPC1), Sarcoma(Saos-2)Ovary(OVCAR8), Stomach(NCI-N87), Melanoma(SKMEL3,A431, MALME3M), Colon(Colo205,SW620,HCT116), Breast(SKBR3,MDA-MB-453,MCF7), Lung(NCI-H82,MV522,NCI-H522), etc.

  • Concentrations

    10 nM

  • Incubation Time

    72 hours

  • Method

    Cancer cell lines are seeded into 384-well microtiter plates. After seeding, the cells are incubated at 37 °C in 5% CO2 for 24 hours. GSK461364 is added to each cell line at 10 nM with a nontreated control. A zero-time (T = 0) value is read for each cell line. After 72 hours, the medium containing GSK461364 or DMSO control is aspirated from all of the remaining cells and the cell nuclei are stained with 4′,6-diamidino-2-phenylindole and the fluorescent intensity measured using an InCell1000 High Content Analyzer. The percent intensity of the 4′,6-diamidino-2-phenylindole stain at 72 hours, relative to intensity at time zero, is calculated for each concentration of GSK461364 in each of the triplicate wells.

Animal Study:

[1]

  • Animal Models

    Nude mice bearing Colo205 (colorectal) xenograft tumors

  • Dosages

    25, 50, and 100 mg/kg

  • Administration

    Administered via i.p.(every 2 days or every 4 days)

Customer Product Validation

Data from [J Biol Chem, 2012, 287, 17088-99]

Data from [Data independently produced by , , Cancer Sci, 2016, 107(12):1877-1887]

Data from [Data independently produced by , , Reprod Domest Anim, 2018, 53(1):256-265]

Selleck's GSK461364 has been cited by 30 publications

The kinase PLK1 promotes the development of Kras/Tp53-mutant lung adenocarcinoma through transcriptional activation of the receptor RET [ Sci Signal, 2022, 15(754):eabj4009] PubMed: 36194647
Identification of New Vulnerabilities in Conjunctival Melanoma Using Image-Based High Content Drug Screening [ Cancers (Basel), 2022, 14(6)1575] PubMed: 35326726
Inhibition of CDK4/6 promotes CD8 T-cell memory formation [ Cancer Discov, 2021, candisc.1540.2020] PubMed: 33941591
Mapping the landscape of synthetic lethal interactions in liver cancer [ Theranostics, 2021, 11(18):9038-9053] PubMed: 34522226
Bub1 and CENP-U redundantly recruit Plk1 to stabilize kinetochore-microtubule attachments and ensure accurate chromosome segregation [ Cell Rep, 2021, 36(12):109740] PubMed: 34551298
PLK1 inhibition sensitizes breast cancer cells to radiation via suppressing autophagy [ Int J Radiat Oncol Biol Phys, 2021, S0360-3016(21)00203-0] PubMed: 33621661
Multiomic analysis and immunoprofiling reveal distinct subtypes of human angiosarcoma [ J Clin Invest, 2020, 139080] PubMed: 33016928
Prolonged Mitosis Results in Structurally Aberrant and Over-Elongated Centrioles [ J Cell Biol, 2020, 1;219(6):e201910019] PubMed: 32271878
Dual targeting of Polo-like kinase 1 and baculoviral inhibitor of apoptosis repeat-containing 5 in TP53-mutated hepatocellular carcinoma [ World J Gastroenterol, 2020, 26(32):4786-4801] PubMed: 32921957
VISAGE Reveals a Targetable Mitotic Spindle Vulnerability in Cancer Cells. [ Cell Syst, 2019, 9(1):74-92.e8] PubMed: 31302152

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SHIPPING AND STORAGE
Selleck products are transported at room temperature. If you receive the product at room temperature, please rest assured, the Selleck Quality Inspection Department has conducted experiments to verify that the normal temperature placement of one month will not affect the biological activity of powder products. After collecting, please store the product according to the requirements described in the datasheet. Most Selleck products are stable under the recommended conditions.

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