Pexidartinib hydrochloride (PLX-3397)

Pexidartinib hydrochloride (PLX-3397 hydrochloride) is a potent, selective and ATP-competitive CSF1R (cFMS) and c-Kit inhibitor, with IC50s of 20 and 10 nM, respectively. Pexidartinib exhibits 10- to 100-fold selectivity for c-Kit and CSF1R over other related kinases, such as FLT3, KDR (VEGFR2), LCK, FLT1 (VEGFR1) and NTRK3 (TRKC), with IC50s of 160, 350, 860, 880, and 890 nM, respectively[1].

Research Areas >> Cancer

Signaling Pathways >> Protein Tyrosine Kinase/RTK >> c-Fms

Signaling Pathways >> Protein Tyrosine Kinase/RTK >> c-Kit

IC50: 10 nM (c-Kit), 20 nM (cFMS), 160 nM (FLT3), 350 nM (KDR), 860 nM (LCK), 880 nM (FLT1), 890 nM (NTRK3)[1]

Pexidartinib (PLX3397; 0.25, 1 mg/kg, i.p., twice daily for 8 days) inhibits the proliferation of microglia and BrdU-positive cells in neonatal mice[2]. Pexidartinib (1 mg/kg, twice daily for 8 day) shows no obvious effect on the cleaved caspase-3-positive cells in mice[2]. Animal Model: Neonatal mice[2] Dosage: 0.25, 1 mg/kg Administration: I.P. twice daily for 8 days Result: Decreased the number of microglia and BrdU-positive proliferative cells, but did not change the cleaved caspase-3-positive cells.

[1]. DeNardo DG, et al. Leukocyte complexity predicts breast cancer survival and functionally regulates response to chemotherapy. Cancer Discov. 2011 Jun;1(1):54-67.

[2]. Kuse Y, et al. Microglia increases the proliferation of retinal precursor cells during postnatal development. Mol Vis. 2018 Jul 30;24:536-545. eCollection 2018.