In Vitro: Carbidopa ((S)-(-)-Carbidopa) exhibits activities similar to that described for other AhR ligands in BχPC3 and Capan-2 cells, namely the induction of CYP1A1 and CYP1A2, which are inhibited by AhR antagonists such as CH223191.
In Vivo: Carbidopa also induces nuclear uptake of the AhR, and in vivo studies show that carbidopa at a dose of 1 mg/mouse significantly inhibits tumor growth in athymic nude mice bearing BχPC3 cells as xenografts.