CCG-203971

Biological Activity

CCG-203971 is an inhibitor of the Rho/MKL1/SRF transcriptional pathway, which has been shown to play a role in metastasis of melanoma and breast cancer and clinically associated with castration-resistant prostate cancer. CCG-203971 is a second-generation analog of CCG-1423 (SML0987) with an IC₅₀ of 4.2 μM vs 1 μM for CCG-1423, but less cytotoxicity. In mouse studies, CCG-203971 inhibited invasion of PC-3 prostate cancer cells and was well tolerated up to doses of 100 mg/kg IP over 5 days.

The Rho/MRTF/SRF pathway has also been shown to be involved in multiple types of solid organ fibrosis. CCG-203971 repressed both matrix-stiffness and TGF-β-mediated fibrogenesis in human colonic myofibroblasts and showed antifibrotic activity in a murine model of skin injury and in pulmonary fibrosis lung fibroblasts.

Conversion of different model animals based on BSA (Value based on data from FDA Draft Guidelines)

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.

Chemical Information