Abstract
Chromosome aberrations (CAs), i.e. changes in chromosome number or structure, are known to cause chromosome rearrangements and subsequently tumorigenesis. However, the involvement of CAs in chemical-induced carcinogenesis is unclear. In the current study, we aimed to clarify the possible involvement of CAs in chemical carcinogenesis using a rat model with the non-mutagenic hepatocarcinogen acetamide. In an in vivo micronucleus (MN) test, acetamide was revealed to induce CAs specifically in rat liver at carcinogenic doses. Acetamide also induced centromere-positive large MN (LMN) in hepatocytes. Immunohistochemical and electron microscopic analyses of the LMN, which can be histopathologically detected as basophilic cytoplasmic inclusion, revealed abnormal expression of nuclear envelope proteins, increased heterochromatinization, and massive DNA damage. These molecular pathological features in LMN progressed with acetamide exposure in a time-dependent manner, implying that LMN formation can lead to chromosome rearrangements. Overall, these data suggested that CAs induced by acetamide play a pivotal role in acetamide-induced hepatocarcinogenesis in rats and that CAs can cause chemical carcinogenesis in animals via MN formation.
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We thank Ms. Ayako Saikawa and Ms. Yoshimi Komatsu for expert technical assistance in processing histological materials.
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Kenji Nakamura is an employee of Ono Pharmaceutical Co., Ltd., Osaka, Japan. The authors declare no conflicts of interest associated with this manuscript.
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Nakamura, K., Ishii, Y., Takasu, S. et al. Chromosome aberrations induced by the non-mutagenic carcinogen acetamide involve in rat hepatocarcinogenesis through micronucleus formation in hepatocytes. Arch Toxicol 95, 2851–2865 (2021). https://doi.org/10.1007/s00204-021-03099-9
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DOI: https://doi.org/10.1007/s00204-021-03099-9