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Reduced Fhit protein expression in nickel-transformed mouse cells and in nickel-induced murine sarcomas

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Abstract

Nickel compounds are carcinogenic and induce malignant transformation of cultured cells. Since nickel has low mutagenic potential, it may act predominantly through epigenetic mechanisms, including down-regulation of tumor suppressor genes. FHIT is a tumor suppressor gene whose expression is frequently reduced or lost in tumors and pre-malignant lesions. Previously, we have shown that the phosphohydrolase activity of Fhit protein, associated with its tumor suppressor action, is inhibited by nickel [12]. In cells, such effect would assist in carcinogenesis. The latter could be further enhanced if nickel also lowered cellular levels of Fhit protein itself, e.g. by down-regulation of FHIT gene. To test this possibility, we determined Fhit protein and Fhit-mRNA levels in a nickel-transformed mouse cell line and in nickel-induced murine sarcomas. In B200 cells, derived by nickel treatment of BALB/c-3T3 cells and exhibiting a malignant phenotype, Fhit protein levels were 50% of those in the parental cells, while Fhit-mRNA expression remained unchanged. A decrease of up to > 90percnt; in Fhit protein levels was also observed in 22 local sarcomas (mostly fibrosarcomas) induced by i.m. injection of nickel subsulfide in C57BL/6 and MT+ (C57BL/6 overexpressing metallothionein) mice, as compared with normal muscles. Moreover, Fhit was absent in 3 out of 10 sarcomas from MT+ mice and in 1 of 12 sarcomas from C57BL/6 mice. The lack of Fhit protein coincided with the absence of the Fhit-mRNA transcript in these tumors. However, in the other tumors, the decreased Fhit levels were not always accompanied by reduced expression of Fhit-mRNA. Thus, the observed lowering of Fhit protein levels is mostly associated with changes in mRNA expression and protein translation or turnover rates, and rarely with a full silencing of the gene itself. Overall, the decline of Fhit in cells or tissues malignantly transformed by nickel may indicate possible involvement of this effect in the mechanisms of nickel carcinogenesis.

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Authors and Affiliations

  1. Laboratory of Comparative Carcinogenesis, National Cancer Institute at Frederick, Frederick, MD, 21702, USA

    Renata Kowara, Robert M. Bare, Michael P. Waalkes & Kazimierz S. Kasprzak

  2. Laboratory of Molecular Toxicology and Carcinogenesis, Department of Environmental Medicine, New York University School of Medicine, New York, NY, 10016, USA

    Konstantin Salnikow

  3. Basic Research Program, SAIC Frederick, Frederick, MD, 21702, USA

    Bhalchandra A. Diwan

  4. NIEHS, Research Triangle Park, NC, 27709, USA

    Michael P. Waalkes

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  1. Renata Kowara
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Kowara, R., Salnikow, K., Diwan, B.A. et al. Reduced Fhit protein expression in nickel-transformed mouse cells and in nickel-induced murine sarcomas. Mol Cell Biochem 255, 195–202 (2004). https://doi.org/10.1023/B:MCBI.0000007275.22785.91

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  • DOI: https://doi.org/10.1023/B:MCBI.0000007275.22785.91

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