Studies of styrene, styrene oxide and 4-hydroxystyrene toxicity in CYP2F2 knockout and CYP2F1 humanized mice support lack of human relevance for mouse lung tumors

► CYP2F1 in CYP2F2KO/CYP2F1TG mice is active; it metabolizes 3-methylindole. ► Styrene and styrene oxide are not toxic to lung Clara cells in CYP2F1TG mice. ► Ring-oxidized metabolites of styrene are toxic to Clara cells on CYP2F2KO and CYP2F1TG mice. ► Provides evidence that styrene-induced mouse lung tumors are not relevant for human risk assessment. Styrene (S) is lung tumorigenic in mice but not in rats. S and its alkene-oxidized metabolite styrene oxide (SO) were not lung toxic in CYP2F2(−/−) [knockout] mice, indicating S-induced mouse lung tumors are mediated through mouse-specific CYP2F2-generated ring-oxidized metabolite(s) in lung bronchioles. The human relevance of the CYP2F MOA was assessed by insertion of a human CYP2F1, 2A13, 2B6 transgene into CYP2F2(−/−) mice; CYP2F1 expression and activity were confirmed in the transgenic (TG) mice. No evidence of cytotoxicity or increased cell proliferation (BrdU labeling) was seen in TG mice treated with either S or SO (200mg/kg/day ip for 5days). In contrast to S and SO, 4HS (105mg/kg/day ip for 5days) increased BrdU labeling 5–10-fold in WT mice,