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Cytochrome P450 Family Enzymes (CYP1A2, CYP2C9, CYP2C19) (CYP1A2/2C9/2C19)

Target: CYP1A2/2C9/2C19
Molecular classification: Enzyme, Cytochrome P450, Monooxygenase, Heme protein

Overview

Cytochrome P450 enzymes (CYPs) are a superfamily of heme-containing monooxygenases crucial for the metabolism of endogenous compounds and xenobiotics, including many drugs. CYP1A2, CYP2C9, and CYP2C19 are key isoforms involved in the metabolism of various drugs and endogenous substances. Genetic polymorphisms in these enzymes lead to interindividual variability in drug response, impacting efficacy and safety. CYP1A2 is induced by PAHs and metabolizes caffeine/acetaminophen, CYP2C9 metabolizes NSAIDs/warfarin, and CYP2C19 metabolizes PPIs/clopidogrel.

Other names: CYP450Cytochrome P450 1A2Cytochrome P450 2C9Cytochrome P450 2C19

Mechanism of action

Monooxygenase; catalyzes phase I metabolic reactions, including oxidation, reduction, and hydrolysis.

Biological functions

Drug metabolismXenobiotic metabolismSteroid synthesis/metabolismFatty acid metabolismCholesterol synthesis/metabolismDetoxification

Disease associations

Cancer (activation of pro-carcinogens)Cardiovascular disease (clopidogrel resistance)Adverse drug reactionsTherapeutic failure

Safety considerations

Drug-drug interactionsGenetic polymorphisms affecting drug metabolismAdverse drug reactions due to altered drug exposureTreatment failure due to impaired drug activationIncreased bleeding risk (e.g., with warfarin and CYP2C9 variants)Carcinogenic intermediate formation (CYP1A2 activation of PAHs)

Interacting drugs

Caffeine

9 more in the full profile.

Biomarkers

CYP1A2 genotype (drug response)CYP2C9 genotype (warfarin dosing)CYP2C19 genotype (clopidogrel efficacy, PPI response)

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