Benzo[a]pyrene

Benzo[a]pyrene (CAS 50-32-8) is a polycyclic aromatic hydrocarbon (PAH) compound widely present in coal tar, automobile exhaust, tobacco smoke, and the fumes produced by wood burning. Benzo[a]pyrene is commonly used as a chemical carcinogen to study its carcinogenic mechanisms and biological effects. Its carcinogenic action is mainly achieved through metabolic activation: it is first metabolized by cytochrome P450 enzymes (e.g., CYP1A1) to benzo[a]pyrene diol epoxide, a metabolite that forms adducts with DNA, causing DNA damage and mutations that lead to carcinogenesis. Benzo[a]pyrene is also a ligand of the aryl hydrocarbon receptor (AhR) and can induce CYP1A1 expression by activating the AhR pathway, further enhancing its metabolic activity. In cell models, benzo[a]pyrene is commonly used to induce DNA damage and study carcinogenic mechanisms; in animal models, it is often administered by skin painting or intraperitoneal injection to study its carcinogenic and toxic effects.