Promotive effects of cell proliferation and chromosomal instability induced by tribbles-related protein 3 in mouse mammary tumor cells

Sakai,Yuto; Fukamachi,Katsumi; Futakuchi,Mitsuru; Hayashi,Hidetoshi; Suzui,Masumi

doi:10.3892/or.2013.2441

Promotive effects of cell proliferation and chromosomal instability induced by tribbles-related protein 3 in mouse mammary tumor cells

Authors:
- Yuto Sakai
- Katsumi Fukamachi
- Mitsuru Futakuchi
- Hidetoshi Hayashi
- Masumi Suzui
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Affiliations: Department of Molecular Toxicology, Nagoya City University Graduate School of Medical Sciences and Medical School, Nagoya 467-8601, Japan, Department of Drug Metabolism and Disposition, Nagoya City University Graduate School of Pharmaceutical Sciences, Nagoya 467-8603, Japan
Published online on: April 30, 2013 https://doi.org/10.3892/or.2013.2441
Pages: 64-70

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Abstract

Tribbles-related protein 3 (TRB3) has been shown to be a crucial modulator of tumorigenesis. However, the precise role and the functional morphology of TRB3 are not clearly understood. To elucidate these enigmas we established the cell line, M2TRB3, by introducing the human TRB3 gene and protein in Cl66M2 (M2) mouse mammary tumor cells. This cell line stably expressed the TRB3 gene and protein. After 72 h of cell culture, there was a 34% increase in the growth of M2TRB3 cells compared to the control M2 mock cells. The mean volume of the tumors originating from the M2TRB3 cells was significantly increased by 38% when compared to the mean volume of the M2 mock tumors, and the proliferating cell nuclear antigen (PCNA) labeling index in the M2TRB3 tumors was higher when compared to that of the M2 and M2 mock cells. In the tumor tissue samples, the mean diameter of nuclei in the M2TRB3 tumor cells (9.4±0.3 µm) showed a significant increase compared to that of the M2 mock tumor cells (7.0±0.2 µm). M2TRB3 cells also showed a marked increase in the population of tetraploid or octaploid nuclei compared to M2 mock cells bearing mainly either diploid or tetraploid nuclei. Western blot analysis revealed the overexpression of cyclin B1 and cyclin D1 in M2TRB3 cells when compared to that in the M2 mock cells. These novel findings provide further evidence that TRB3 promotes cell proliferation and chromosomal instability by causing polyploidization during development.

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