Abstract
The activation by the carcinogenic polycyclic aromatic hydrocarbon (PAH) benzo[a]pyrene (BP) of transcription factors NF-κB and AP-1 in hepatoma 27 and HepG2 cell cultures was studied. In contrast to the hepatoma HepG2 cells, cytochrome P450 isoforms and Ah-receptor are not expressed in the hepatoma 27 cells. The transcription factor NF-κB was activated only in the hepatoma 27 cells by BP treatment but not by its noncarcinogenic isomer benzo[e]pyrene (BeP). Conversely to NF-κB activation the transcription factor AP-1 was activated in the hepatoma HepG2 cells by cell treatment with BP but not in the hepatoma 27 cells. It is concluded that the NF-κB activation is caused by nonmetabolized BP molecule and not related to activation of the Ah-receptor. The transcription factor AP-1 seems to be activated as a result of the interaction of BP with the Ah-receptor. The realization of tumor promotion stage by carcinogenic PAHs treatment in dependence on the cytochrome P450 and Ah-receptor levels in the initiated cells is discussed.
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Abbreviations
- BP:
-
benzo[a]pyrene
- BeP:
-
benzo[e]pyrene
- CYP:
-
cytochromes of the P450 family
- PAH:
-
polycyclic aromatic hydrocarbon
- TCDD:
-
2,3,7,8-tetrachlorodibenzo-p-dioxin
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Original Russian Text © N. A. Bolotina, A. V. Gasporian, T. K. Dubavaja, V. A. Evteev, V. A. Kobliakov, 2007, published in Biokhimiya, 2007, Vol. 72, No. 5, pp. 682–689.
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Bolotina, N.A., Gasparian, A.V., Dubovaja, T.K. et al. Benzo[a]pyrene-dependent activation of transcription factors NF-κB and AP-1 related to tumor promotion in hepatoma cell cultures. Biochemistry Moscow 72, 552–557 (2007). https://doi.org/10.1134/S0006297907050124
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DOI: https://doi.org/10.1134/S0006297907050124