In vitro activity: CZC-54252 is a potent, selective, and metabolically stable LRRK2 inhibitor (Leucine-rich repeat kinase-2) with IC50 of 1.28 nM and 1.85 nM for wild-type and G2019S LRRK2 respectively. CZC-25146 prevents mutant LRRK2-induced injury of cultured rodent and human neurons with mid-nanomolar potency. CZC-54252 inhibited the activity of recombinant human wild-type LRRK2 with an IC50 ranging from 1 to 5 nM. The G2019S mutant was inhibited with an IC50 ranging from ～2 to ～7 nM in a TF-FRET assay. In addition, they were screened against a kinase panel of 185 kinases and exhibited good selectivity. CZC-25146 (19) inhibited five other kinases, PLK4, GAK, TNK1, CAMKK2, and PIP4K2C, with high potency only, but none of them have been classified as predictors of genotoxicity or hematopoietic toxicity.

Kinase Assay: CZC-54252 inhibited the activity of recombinant human wild-type LRRK2 with an IC50 ranging from ～1 to ～5 nM. The G2019S mutant was inhibited with an IC50 ranging from ～2 to ～7 nM in a TF-FRET assay. In addition, they were screened against a kinase panel of 185 kinases and exhibited good selectivity. CZC-25146 (19) inhibited five other kinases, PLK4, GAK, TNK1, CAMKK2, and PIP4K2C, with high potency only, but none of them have been classified as predictors of genotoxicity or hematopoietic toxicity.G2019S LRRK2-induced human neuronal injury was attenuated by CZC-25146 with an EC50 of ~4 nM (EC50 CZC-54252 ~1 nM) and fully reversed to wild-type levels by both compounds at concentrations as low as 8 nM (1.6 nM for CZC-54252).

Cell Assay: