PLX-4720

PubMed: 23076151      J Biol Chem

WM793 and WM793-Res NRAS cells were seeded overnight in the absence of PLX4720 and then treated with 1 μm PLX4720 for times ranging from 0 to 24 h. Samples were analyzed by Western blotting for phospho-MEK, total MEK, phospho-ERK1/2, total ERK1/2, phospho-S910 FAK, and total FAK.

PubMed: 26023796      Oncotarget

Three BRAF(V600E) glioma cell lines, NMC-G1, AM38 and DBTRG-05MG were subjected to a 24 hour time course treatment with 5 μM PLX4720 in the presence or absence of 1 μM HKI-272. These cells were serum starved for 16 hours before being stimulated with 10% FBS and harvested for immunoblotting analysis. Cells treated with PLX4720 alone showed an initial suppression of MEK and ERK phosphorylation followed by a profound rebound of MAPK pathway activation as early as one hour post-PLX4720 treatment. Elevated levels of EGFR phosphorylation were also observed in the PLX4720 treated cells. The extent of Akt phosphorylation increased upon PLX4720 treatment, although the extent varies between cell lines. In contrast, no reactivation of EGFR, MEK, ERK or Akt was observed in cells pre-treated with HKI-272.

PubMed: 21828154      Invest Ophthalmol Vis Sci

Immunoblot analysis revealed that PLX4720 (3 μM) decreased levels of phosphorylated ERK, decreased levels of cyclin D1, increased levels of p27, and decreased levels of phosphorylated Rb in BRAF-mutant (OCM3) cells. On the contrary, in Gα-mutant (OMM1.3) UM cells, PLX4720 induced a paradoxical increase in phosphorylated ERK and Rb levels and an early increase in cyclin D1 levels but did not stimulate p27 levels.

PubMed: 21828154      Invest Ophthalmol Vis Sci

Immunoblot analysis revealed that both AZD6244 and PLX4720 induced an early (within 2–6 hours of exposure) increase in the levels of phosphorylated Akt (at residues Ser473 and Thr308) in both BRAF-mutant OCM3 and Gα-mutant OMM1.3 cells. Eventually, and with prolonged drug exposure, the phosphorylation of Akt returned to baseline in Gα-mutant OMM1.3 cells and decreased even below baseline levels in BRAF-mutant OCM3 cells.

PubMed: 30979895      Nat Commun

Representative images of LysoTracker Red (red) and LAMP1 (green) immunostaining of PLX4720 (1 μM, 12 h-treated) A375 cells with depletion of the indicated genes. Note the reduced lysosome staining in PLX4720-treated cells upon TFEB depletion. 

PubMed: 30979895      Nat Commun

Representative confocal images of subcellular translocation of endogenous TFEB (green) and ZKSCAN3 (red) in A375 cells treated with PLX4720 (1 μM, 12 h). n = 3 independent experiments. 

PubMed: 27848137      J Neurooncol

AM-38 and DBTRG-05MG cells were treated for 5 days. Media was changed once every 3 days. Cell viability was measured using WST-1 assay. Error bars indicate the variation between triplicate measurements. PLX4720 and PD0325901 alone or in combination reduced cell viability significantly. However, combined therapy led to the most significant cell viability reduction compared to either monotherapy in both AM-38 and DBTRG-05MG cell lines.

PubMed: 23204132      Clin Cancer Res

(C, D and E) IFN-γ secretion by pmel-1 T cells co-cultured with transduced melanoma cells (after cell sorting) that had been pre-treated with the indicated concentrations of PLX4720, as determined by ELISA. (*P<0.05, ** P<0.01) Data are representative of 3 independent experiments.