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PRINCIPLES OF TOXICOLOGY

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TABLE 3.4 Important Cytochrome P450s a<br />

68<br />

Forms Present in<br />

Substrates/<br />

Subfamily<br />

Rat Rabbit Human Mouse Tissue<br />

Reactions Inducers Inhibitors<br />

3A 1,2 6 3,4,5,7 11,13 erythromycin N deM, glucocorticoids DEX, cimetidine,<br />

TAO MI complex, PCN, macrolides, TAO naringenin<br />

cyclosporine, quinidine, clotrimazole,<br />

testosterone, and cortisol phenobarbital<br />

6β-OH, mephenytoin<br />

(rat), benzphetamine,<br />

nifedipine, and other<br />

dihydropyridines<br />

4A 1,2,3,8 4,5,6,7 9,11 10,12 liver, kidney Lauric acid and peroxisome proliferators,<br />

prostaglandin ω-OH DEHP, clofibrate<br />

pregnancy (4A4)<br />

4B 1 1 1 lung valproic acid<br />

a<br />

Abbreviations: deE = deethylation<br />

deM = demethylation<br />

DEHP = di(2-ethylhex yl)phthalate<br />

DEX = dex amethasone<br />

EH = ex trahepatic<br />

GI = gastrointestinal tract<br />

Kid = kidney<br />

MI = metabolic-intermediate<br />

3MC = 3-methylcholanthrene<br />

NBI = N-benzylimidazole<br />

OH = hydrox ylation<br />

PAH = polycyclic aromatic hydrocarbons<br />

PCB = polychlorinated biphenyls<br />

PCN = pregeneolone 16α carbonitrile<br />

PB = phenobarbital<br />

RIF = rifampicin<br />

TAO = troleandomycin<br />

TCDD = 2,3,7,8-tetrachlorodibenzo-p-diox in

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