Abstract
To elucidate the role of metal-related molecules in hepatocarcinogenesis, we examined immunolocalization of transferrin receptor (Tfrc), ceruloplasmin (Cp) and metallothionein (MT)-1/2 in relation to liver cell foci positive for glutathione-S-transferase placental form (GST-P) in the early stage of tumor promotion by fenbendazole (FB), phenobarbital, piperonyl butoxide or thioacetamide in a rat two-stage hepatocarcinogenesis model. To estimate the involvement of oxidative stress responses to the promotion, immunolocalization of 4-hydroxy-2-nonenal, malondialdehyde and acrolein was similarly examined. Our findings showed that MT-1/2 immunoreactivity was not associated with the cellular distribution of GST-P and proliferating cell nuclear antigen, suggesting no role of MT-1/2 in hepatocarcinogenesis. We also found enhanced expression of Tfrc after treatment with strong tumor-promoting chemicals. With regard to Cp, the population showing down-regulation was increased in the GST-P-positive foci in relation to tumor promotion. Up-regulation of Tfrc and down-regulation of Cp was maintained in GST-P-positive neoplastic lesions induced after long-term promotion with FB, suggesting the expression changes occurring downstream of the signaling pathway involved in the formation of GST-P-positive lesions. Furthermore, enhanced accumulation of lipid peroxidation end products was observed in the GST-P-positive foci by promotion. Post-initiation treatment with peroxisome proliferator-activated receptor α agonists did not enhance any such distribution changes in GST-P-negative foci. The results thus suggest that facilitation of lipid peroxidation is involved in the induction of GST-P-positive lesions by tumor promotion from an early stage, and up-regulation of Tfrc and down-regulation of Cp may be a signature of enhanced oxidative cellular stress in these lesions.
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This work was supported by Health and Labour Sciences Research Grants (Research on Food Safety) from the Ministry of Health, Labour and Welfare of Japan. All authors disclose that there are no conflicts of interest that could inappropriately influence the outcome of this study.
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Mizukami, S., Ichimura, R., Kemmochi, S. et al. Induction of GST-P-positive proliferative lesions facilitating lipid peroxidation with possible involvement of transferrin receptor up-regulation and ceruloplasmin down-regulation from the early stage of liver tumor promotion in rats. Arch Toxicol 84, 319–331 (2010). https://doi.org/10.1007/s00204-009-0496-x
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DOI: https://doi.org/10.1007/s00204-009-0496-x