Abiraterone Acetate

Biological Activity

Abiraterone Acetate (CB 7630) is a highly active and selective 17α-hydroxylase/17,20 lyase (CYP17A1) inhibitor with an IC50 of 72 nM. Abiraterone Acetate (CB 7630) inhibitor CYP11B1, CYP11B2 and CYP3A4 with IC50 of 1.6, 1.8 and 2.7 μM. Abiraterone Acetate (CB 7630) is used in the study of castration-resistant prostate cancer. Abiraterone Acetate (CB 7630) blocks the formation of testosterone by inhibiting CYP17A1. Abiraterone Acetate (CB 7630) caused significant reductions in the weights of the ventral prostate and seminal vesicles. There was no reduction seen in the weight of these organs with KC. Abiraterone Acetate (CB 7630) reduced plasma testosterone to 0.1 nM or less, despite a three- to four-fold increase in the plasma level of luteinizing hormone (LH).

Protocol

Cell Experiment
Cell lines	LNCaP and VCaP cells
Preparation method	Seeding LNCaP and VCaP cells in 96-well plates and growing in CSS-supplemented phenol red-free or FBS-supplemented media for 7 days.Treatig cells with Abiraterone at 24 hours and 96 hours after plating and determining cell viability on day 7 by adding CellTiter Glo and measuring luminescence
Concentrations	0 μM -10 μM
Incubation time	24 hours and 96 hours

Animal Experiment
Animal models	Male NOD/SCID mice with LAPC4 cells
Formulation	0.1 mL 5% benzyl alcohol and 95% safflower oil solution
Dosages	0.5 mmol/kg/d
Administration	Administered via s.c.

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