HG-10-102-01

Biological Activity

HG-10-102-01 is a potent and selective inhibitor of wild-type LRRK2(IC50=23.3 nM) and the G2019S mutant(IC50=3.2 nM) IC50 Value: 23.3 nM (WT LRRK2); 3.2 nM (LRRK2 G2019S) Target: LRRK2 HG-10-102-01 maintains the ability to potently inhibit the biochemical activity of wild-type and G2019S mutant LRRK2. HG-10-102-01 exhibited biochemical IC50s of 20.3 and 3.2 nM against wild-type LRRK2 and LRRK2[G2019S], respectively. At a concentration of 10 μM, HG-10-102-01 only inhibited the kinase activities of MLK1 and MNK2 to greater than 80% of the DMSO control. Dose-response analysis revealed inhibition of MLK1 with an IC50 2.1 μM and MNK2 with an IC50 0.6 μM. KinomeScan analysis against a near comprehensive panel of 451 kinases at a concentration of 1 μM resulted in no interactions detected with kinases other than G2019S LRRK2 with the exception of one mutant form of c-Kit (L576P) demonstrating the outstanding selectivity of this inhibitor. HG-10-102-01 significantly inhibited phosphorylation of wildtype LRRK2 and LRRK2[G2019S] mutant at Ser910 and Ser935 at 0.3-1.0 μM in cell culture, which is approximately the same potency as LRRK2-IN-1 (1). HG-10-102-01 is relatively insensitive to the A2016T mutation which suggests that this mutant will not be useful to validate whether the pharmacological effects of the compound are LRRK2-dependent. HG-10-102-01 can inhibit phosphorylation of Ser910 and Ser935 of LRRK2 in brain and peripheral tissues following intraperitoneal doses of 50 mg/kg. Further optimization of this chemo-type especially in regards to in vivo half-life will be reported in due course.

Chemical Information

Molecular Weight	377.83
CAS Number	1351758-81-0
Solubility (25°C)	DMSO ≥ 50 mg/mL
Storage	Powder          -20°C   3 years ;  4°C   2 years In solvent       -80°C   6 months ;  -20°C   1 month

Conversion of different model animals based on BSA (PMID: 27057123)

Species	Mouse	Rat	Rabbit	Guinea pig	Hamster	Dog
Weight (kg)	0.02	0.15	1.8	0.4	0.08	10
Body Surface Area (m2)	0.007	0.025	0.15	0.05	0.02	0.5
Km factor	3	6	12	8	5	20

Animal A (mg/kg) = Animal B (mg/kg) multiplied by	Animal B Km
	Animal A Km

For example, to modify the dose of Compound A used for a mouse (20 mg/kg) to a dose based on the BSA for a rat, multiply 20 mg/kg by the K_m factor for a mouse and then divide by the K_m factor for a rat. This calculation results in a rat equivalent dose for Compound A of 10 mg/kg.

References

[1] Min Wang, et al. Bioorg Med Chem Lett. Synthesis of [ 11 C]HG-10-102-01 as a new potential PET agent for imaging of LRRK2 enzyme in Parkinson's disease

[2] Hwan Geun Choi, et al. ACS Med Chem Lett. Brain Penetrant LRRK2 Inhibitor