title: Effects of benzo(a)pyrene on the expression of heat shock proteins, pro-inflammatory cytokines and antioxidant enzymes in hepatic tumors induced by rat hepatoma N1-S1 cells.
abstract: Benzo(a)pyrene (BaP) is a polycyclic aromatic hydrocarbon (PAH) that is easily introduced to humans via consumption of grilled or smoked meat. BaP causes harmful oxidative effects on cell development, growth and survival through an increase in membrane lipid peroxidation, oxidative DNA damage and mutagenesis. Therefore, the present study was conducted to evaluate the synergistic effects of BaP on oxidative stress in hepatic tumors. In this study, we established a hepatic tumor model by injecting rat hepatoma N1-S1 cells into healthy rats. Changes in the abundance of heat shock proteins (HSPs), antioxidant enzymes and pro-inflammatory cytokines were then investigated by western blot analysis. In addition, we examined changes in oxidative stress levels. Injection of N1-S1 cells or concomitant injection of BaP and N1-S1 cells resulted in the formation of hepatic tumors at the injection site. Evaluation of rat plasma reveals that hepatic tumors induced by BaP and N1-S1 cells expresses higher levels of Hsp27, superoxide dismutase (SOD), and tumor necrosis factor-α (TNF-α) when compared to those induced by N1-S1 cells only. The collective results of this study suggest that BaP exerts synergistic effects on the expression of HSP, cytokines and antioxidant enzymes in hepatic tumors induced by rat hepatoma N1-S1 cells.
authors.affiliation: Graduate School of Medicine, Korea University, Seoul, Korea.
authors.forename: Zhi
authors.initials: Z
authors.lastname: Zheng
authors.forename: So-Young
authors.initials: SY
authors.lastname: Park
authors.forename: Min
authors.initials: M
authors.lastname: Lee
authors.forename: Sohee
authors.initials: S
authors.lastname: Phark
authors.forename: Nam Hee
authors.initials: NH
authors.lastname: Won
authors.forename: Hyung-Sik
authors.initials: HS
authors.lastname: Kang
authors.forename: Donggeun
authors.initials: D
authors.lastname: Sul
mesh_terms: D000818:Animals; D000975:Antioxidants / Q000378:metabolism*; D001564:Benzo(a)pyrene / Q000494:pharmacology*; D006528:Carcinoma, Hepatocellular / Q000378:metabolism / Q000473:pathology; D045744:Cell Line, Tumor / Q000187:drug effects*; D016207:Cytokines / Q000378:metabolism*; D006360:Heat-Shock Proteins / Q000378:metabolism*; D006801:Humans; D008113:Liver Neoplasms / Q000201:enzymology* / Q000378:metabolism* / Q000473:pathology; D008297:Male; D009374:Neoplasms, Experimental / Q000378:metabolism / Q000473:pathology; D018384:Oxidative Stress / Q000187:drug effects; D051381:Rats; D017207:Rats, Sprague-Dawley
chemical_list: D000975:Antioxidants; D016207:Cytokines; D006360:Heat-Shock Proteins; D001564:Benzo(a)pyrene