PLX-4720

Catalog No.S1152 Batch:S115205

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Technical Data

Formula

C17H14ClF2N3O3S
Molecular Weight 413.83 CAS No. 918505-84-7
Solubility (25°C)* In vitro DMSO 82 mg/mL (198.14 mM)
Water Insoluble
Ethanol Insoluble
In vivo (Add solvents to the product individually and in order)
Homogeneous suspension
CMC-NA
≥5mg/ml Taking the 1 mL working solution as an example, add 5 mg of this product to 1 ml of CMC-Na solution, mix evenly to obtain a homogeneous suspension with a final concentration of 5 mg/ml.
* <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 PLX4720 is a potent and selective inhibitor of B-RafV600E with IC50 of 13 nM in a cell-free assay, equally potent to c-Raf-1(Y340D and Y341D mutations), 10-fold selectivity for B-RafV600E than wild-type B-Raf.
Targets
C-Raf-1 (Y340D/Y341D) [1]
(Cell-free assay)		 B-Raf (V600E) [1]
(Cell-free assay)		 BRK [1]
(Cell-free assay)		 B-Raf [1]
(Cell-free assay)
6.7 nM 13 nM 130 nM 160 nM
In vitro PLX-4720 displays >10 times selectivity against wild type B-Raf, and >100 times selectivity over other kinases such as Frk, Src, Fak, FGFR, and Aurora A with IC50 of 1.3-3.4 μM. PLX-4720 significantly inhibits the ERK phosphorylation in cell lines bearing B-RafV600E with IC50 of 14-46 nM, but not the cells with wild-type B-Raf. PLX-4720 significantly inhibits the growth of tumor cell lines bearing the B-RafV600E oncogene, such as COLO205, A375, WM2664, and COLO829 with GI50 of 0.31 μM, 0.50 μM, 1.5 μM, and 1.7 μM, respectively. In addition, PLX-4720 treatment at 1 μM induces cell cycle arrest and apoptosis exclusively in the B-RafV600E-positive 1205Lu cells, but not in the B-Raf wild-type C8161 cells. [1] PLX-4720 treatment (10 μM) significantly induces >14-fold expression of BIM in the PTEN+ cells, compared with the PTEN- cell lines (4-fold), giving an explanation of the resistance of PTEN- cells to PLX-4720-induced apoptosis. [2]
In vivo Oral administration of PLX-4720 at 20 mg/kg/day induces significant tumor growth delays and regressions in B-RafV600E-dependent COLO205 tumor xenografts, without obvious adverse effects in mice even at dose of 1 g/kg. PLX-4720 at 100 mg/kg twice daily almost completely eliminates the 1205Lu xenografts bearing B-RafV600E, while has no activity against C8161 xenografts bearing wild-type B-Raf. The anti-tumor effects of PLX-4720 correlate with the blockade of MAPK pathway in those cells harboring the V600E mutation. [1] PLX-4720 treatment at 30 mg/kg/day significant inhibits the tumor growth of 8505c xenografts by >90%, and dramatically decreases distant lung metastases. [3]

Protocol (from reference)

Kinase Assay:[1]
  • In vitro Raf kinase activities

    The in vitro kinase activities of wild type Raf and mutants are determined by measuring phosphorylation of biotinylated-MEK protein using Perkin-Elmer's AlphaScreen Technology. For each enzyme (0.1 ng), 20-μL reactions are carried out in 20 mM Hepes (pH 7.0), 10 mM MgCl2, 1 mM DTT, 0.01% Tween-20, 100 nM biotin-MEK protein, various ATP concentrations, and increasing concentrations of PLX-4720 at room temperature. Reactions are stopped at 2, 5, 8, 10, 20, and 30 minutes with 5 μL of a solution containing 20 mM Hepes (pH 7.0), 200 mM NaCl, 80 mM EDTA, and 0.3% BSA. The stop solution also includes phospho-MEK Antibody, Streptavidin-coated Donor beads and Protein A Acceptor beads from the AlphaScreen Protein A Detection Kit. The antibody and beads are preincubated in stop solution in the dark at room temperature for 30 minutes. The final dilution of antibody is 1/2,000, and the final concentration of each bead is 10 μg/mL. The assay plates are incubated at room temperature for one hour then are read on a PerkinElmer AlphaQuest reader.
Cell Assay:[1]
  • Cell lines

    COLO205, A375, WM2664, COLO829, HT716, SW620, H460, Calu-6, HCT116, SK-MEL2, SK-MEL3, Lovo, H1299, 1205Lu, and C8161 cells

  • Concentrations

    Dissolved in DMSO, final concentrations ~1 mM

  • Incubation Time

    24, 48, and 72 hours

  • Method

    Cells are treated with various concentrations PLX-4720 for 24, 48, and 72 hours. Cell proliferation is measured by using the CellTiter-Glo Luminescent Cell Viability Assay or MTT assay. For cell cycle analysis, supernatant and cells are collected, pelleted, and fixed with 70% ethanol. Before staining with propidium iodide (10 μg/mL), cells are incubated for 1 hour at 37 °C in 0.5 mg/mL RNase I to rid samples of residual RNA contamination. Samples are then analyzed by using the EPICS XL apparatus. For the assessment of apoptosis, media and cells are harvested and pelleted before staining with annexin-FITC and propidium iodide. Samples are subsequently analyzed by using the EPICS XL apparatus.
Animal Study:[1]
  • Animal Models

    Female athymic mice (NCr nu/nu) implanted s.c. with COLO205 cells, and SCID mice with 1205Lu or C8161 cells

  • Dosages

    5, 20, or 100 mg/kg

  • Administration

    Oral gavage once or twice daily

References

  • https://pubmed.ncbi.nlm.nih.gov/18287029/
  • https://pubmed.ncbi.nlm.nih.gov/21317224/
  • https://pubmed.ncbi.nlm.nih.gov/20498063/

Customer Product Validation

Combinatorial knockdown of NF1 and C-RAF abrogates NF1-mediated resistance to B-RAF inhibition at the level of ERK phosphorylation. A375 cells were infected with NF1 shRNA and treated with either DMSO or PLX4720 for 16 h. Cell lysates were analyzed for the indicated proteins.

Data from [ Cancer Discov , 2013 , 3, 350-62 ]

(D)Melanoma cell lines were treated with 0.5 uM Pi-103 and/or 2 uM PLX4720 for 4 h. Samples were analyzed by Western blotting for the indicated proteins. β-Actin served as a loading control. (E) Melanoma cell lines were treated with a dilution series of Pi-103 either alone or in combination with the BRAFV600E inhibitor PLX4720 at a concentration of 3 uM (D10) or 1 uM (453A0) for 3 d. Total cell numbers were determined with a cell titer blue assay. The Y-axis represents the percentage of living cells.

Data from [ Genes Dev , 2012 , 26, 1055-69 ]

<p>RAF inhibitors induce dimer formation between KSR and RAF, and activate KSR by CRAF. (A) GDC0879 but not PLX4720 induces BRAF/CRAF dimers. Cells overexpressing myc-CRAF and BRAF were treated with drug for 1 h and CRAF immunoprecipitates were immunoblotted for BRAF and CRAF (epitope tagged with myc). (B) GDC0879 but not PLX4720 enhances KSR/BRAF complexes. KSR immunoprecipitates were prepared from cells overexpressing FLAG-KSR and BRAF after treatment with the indicated drug for 1 h and immunoblotted using antibodies to BRAF. (C) Both GDC0879 and PLX4720 induce KSR/CRAF complexes.KSR immunoprecipitates were prepared from cells overexpressing FLAG-KSR and myc-CRAF after treatment with the indicated drug for 1 h and immunoblotted for CRAF using myc antibodies. (D and E) Requirement of KSR for drug-induced ERK activation. Lysates fromwild-type and KSR deficient fibroblasts, transfected with RASV12, were treated with the indicated doses of either GDC-0879 (D) or PLX4720 (E) for 1 h. Lysates were immunoblotted for phospho-ERK1 and 2, ERK2, and RASV12. (F) KSR and CRAF cooperate to activate MEK. Cells expressing the indicated constructs were treated with a 50 μM PLX4720 for 2 h before cell lysates were prepared and analyzed for pMEK by immunoblotting. CRAF(TM) refers to the T421M gatekeeper mutant that cannot bind to the drug(4). (G) KSR in vitro kinase reactions. Cells were cotransfected with WT or ATP binding deficient KSR and CRAF and immunoprecipitates prepared after cells were treated with an activating dose of PLX (10 μM) for 1 h. KSR immunoprecipitates were prepared, pretreated with 50 uM PLX4720 to inhibit coprecipitating RAF activity, and then tested for kinase activity using purified MEK. MEK phosphorylation was detected using a pMEK specific antibody.</p>

Data from [ Proc Natl Acad Sci USA , 2011 , 108, 6067-6072 ]

<p>LC-MRM identifies differential regulation of BIM in PTENt and PTEN cell lines following PLX4720 treatment. A, representative LC-MRM data showing the fold changes in the expression of Bak, Bax, Bcl-2, Bcl-w, Bcl-xL, BID, BIM, Bok, and Mcl-1 over internal standard in the WM164 (PTENt) and 1205Lu (PTEN) cell lines following treatment with PLX4720 (10 μmol/L, 0-48 hours). Statistical analysis of BIM fold change in PTEN versus PTENt. *, P < 0.05. B, Western blot showing BIM expression following PLX4720 treatment (10 μmol/L, 0-48 hours) in PTEN (WM793, 1205Lu) and WM164 cell lines (PTENt). C, immunofluorescence staining, showing expression of BIM and DAPI staining of PTEN (M233, WM9, WM793, 1205Lu) and PTENt (WM35, WM164, WM983A) cells following PLX4720 treatment (3 μmol/L, 48 hours).D, Western blot showing BAD phosphorylation following treatment with PLX4720 (0-48 hours) in PTEN (WM793,1205Lu) and PTENt WM164. Annexin V binding following treatment with 3 or 10 μmol/L PLX4720 (48 hours) showing increased apoptosis in WM793 stably overexpressing WT BAD. *, P < 0.05.</p>

Data from [ Cancer Res , 2011 , 71, 2750-2760 ]

Selleck's PLX-4720 Has Been Cited by 211 Publications

Elevated Transglutaminase-2 in SOX10-Deficient Melanoma Promotes Tumor Onset and Decreases Intratumoral CD4+ T Cells [ Cancer Res, 2025, 10.1158/0008-5472.CAN-24-3267] PubMed: 40742313
PTRF Confers Melanoma-Acquired Drug Resistance Through the Upregulation of EGFR [ Cell Prolif, 2025, e70086.] PubMed: 40745979
Noncanonical role of Golgi-associated macrophage TAZ in chronic inflammation and tumorigenesis [ Sci Adv, 2025, 11(4):eadq2395] PubMed: 39841821
The ribotoxic stress response drives UV-mediated cell death [ Cell, 2024, 187(14):3652-3670.e40] PubMed: 38843833
Tracking the EMT-like phenotype switching during targeted therapy in melanoma by analyzing extracellular vesicle phenotypes [ Biosens Bioelectron, 2024, 10.1016/j.bios.2023.115819] PubMed: 37952322
Mcl-1 mediates intrinsic resistance to RAF inhibitors in mutant BRAF papillary thyroid carcinoma [ Cell Death Discov, 2024, 10(1):175] PubMed: 38622136
The ERK5 pathway in BRAFV600E melanoma cells plays a role in development of acquired resistance to dabrafenib but not vemurafenib [ FEBS Lett, 2024, 10.1002/1873-3468.14960] PubMed: 38977937
Executioner caspases restrict mitochondrial RNA-driven Type I IFN induction during chemotherapy-induced apoptosis [ Nat Commun, 2023, 14(1):1399] PubMed: 36918588
Executioner caspases restrict mitochondrial RNA-driven Type I IFN induction during chemotherapy-induced apoptosis [ Nat Commun, 2023, 14(1):1399] PubMed: 36918588
TFEB inhibition induces melanoma shut-down by blocking the cell cycle and rewiring metabolism [ Cell Death Dis, 2023, 14(5):314] PubMed: 37160873

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