title: Capsaicin alleviates the imbalance in xenobiotic metabolizing enzymes and tumor markers during experimental lung tumorigenesis.
abstract: Lung cancer is currently a leading cause of death all over the world. Environmental risk factors, particularly genotoxic chemicals such as polycyclic aromatic hydrocarbons (PAH), are likely to account for a much higher mortality. Xenobiotic metabolizing enzymes are potentially chief determinants in both the susceptibility to the mutagenic effects of chemical carcinogens and in the response of tumors to chemotherapy. The well-known carcinogen benzo(a)pyrene (B(a)P) of PAH family was given orally (50 mg/kg body weight) to induce lung cancer in Swiss albino mice. B(a)P induction altered the levels of cytochromes (P450, b5), activities of phase I biotransformation enzymes (NADPH-cytochrome P450 reductase, NADH-cytochrome b5 reductase and epoxide hydrolase), phase II enzymes (glutathione-S-transferase, UDP-glucuronyl transferase and DT-diaphorase), and the levels of serum tumor markers. Treatment with capsaicin (CAP) (10 mg/kg body weight) to the lung carcinoma mice restored back the activities of phase I and II biotransformation enzymes and the levels of tumor markers to near normalcy. The above findings were substantiated by immunoblotting and immunohistochemical analysis of cytochrome P450 1A1 (CYP1A1) in the lung tissues. Our present study unravels that CAP can effectively detoxify the carcinogens which discloses its anti-carcinogenic effect during experimental lung cancer.
authors.affiliation: Department of Biochemistry, University of Madras, Guindy Campus, Chennai, 600-025, Tamil Nadu, India.
authors.forename: P
authors.initials: P
authors.lastname: Anandakumar
authors.forename: S
authors.initials: S
authors.lastname: Kamaraj
authors.forename: S
authors.initials: S
authors.lastname: Jagan
authors.forename: G
authors.initials: G
authors.lastname: Ramakrishnan
authors.forename: C
authors.initials: C
authors.lastname: Naveenkumar
authors.forename: S
authors.initials: S
authors.lastname: Asokkumar
authors.forename: T
authors.initials: T
authors.lastname: Devaki
mesh_terms: D000818:Animals; D014408:Biomarkers, Tumor / Q000097:blood*; D002211:Capsaicin / Q000494:pharmacology / Q000627:therapeutic use*; D019363:Cytochrome P-450 CYP1A1 / Q000378:metabolism; D015786:Cytochromes b5 / Q000378:metabolism; D004354:Drug Screening Assays, Antitumor; D007150:Immunohistochemistry; D008168:Lung / Q000187:drug effects / Q000201:enzymology / Q000473:pathology; D008175:Lung Neoplasms / Q000097:blood / Q000188:drug therapy* / Q000201:enzymology*; D008297:Male; D050216:Metabolic Detoxication, Phase I; D050217:Metabolic Detoxication, Phase II; D051379:Mice; D008862:Microsomes, Liver / Q000187:drug effects / Q000201:enzymology; D009374:Neoplasms, Experimental / Q000097:blood / Q000188:drug therapy* / Q000201:enzymology*; D015262:Xenobiotics / Q000378:metabolism*
chemical_list: D014408:Biomarkers, Tumor; D015262:Xenobiotics; D015786:Cytochromes b5; D019363:Cytochrome P-450 CYP1A1; D002211:Capsaicin