Expression profiles of TIS21/BTG2/PC3 gene knockout in liver of C57BL/6J mice in response to starvation
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PROVIDER: PRJNA415365 | ENA |
REPOSITORIES: ENA
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Project description:TIS21/BTG2/PC3 has been known as one of the primary response genes regulated by p53-dependent and p53-independent manners. In our study, TIS21 reveals various functions as a tumor suppressor in human and mouse tumors. Recently, it has been reported that expression of TIS21 can be induced during starvation in liver, muscle and white adipose tissues. However, there was no report on the role of TIS21 in response to starvation. To investigate any role of TIS21 gene in the metabolic stimulation, we fasted C57BL/6J mice for overnight (20 hour), and then transcriptional profiles of the TIS21-knockout and TIS21-wild type mice were compared. Along with this trial, we also analyzed transcriptional profiles of fetal livers of the 13.5 day-old embryos derived from the TIS21-wild type and knockout mice.
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Project description:In addition to lipid second messengers derived from the plasma membrane, increasing evidence supports the existence of nuclear lipid-dependent signaling networks. Diacylglycerol is a key second messenger, generated at the nuclear level, which is metabolized by diacylglycerol kinases (DGKs). It has been demonstrated that nuclear DGK-ζ negatively regulates cell cycle progression. The aim of this study was to identify key determinants of nuclear DGK-ζ-dependent cell cycle arrest in C2C12 mouse myoblasts. Using DNA microarrays, Real-Time RT-PCR and western blot, we demonstrated that nuclear DGK-ζ downregulated the expression of cyclin D1 and increased the expression of TIS21/BTG2/PC3, a transcriptional regulator of cyclin D1 with a strong anti-proliferative function. Overexpression of TIS21/BTG2/PC3 blocked the cells in G1 phase of the cell cycle and decreased the levels of Ser807/811 phosphorylated retinoblastoma protein, similarly to overexpression of DGK-ζ. Moreover, during myogenic differentiation of C2C12 cells, we showed an increase of TIS21/BTG2/PC3 expression and a decrease in cyclin D1 levels. siRNA downregulation of TIS21/BTG2/PC3 impaired myogenic differentiation by opposing cell cycle arrest. In summary, these data identify TIS21/BTG2/PC3 and cyclin D1 as downstream effectors of the nuclear DGK-ζ and highlight the importance of this DGK isoform in the regulation of myoblast proliferation and differentiation.
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Project description:The ability to generate defined null mutations in mice revolutionized the analysis of gene function in mammals. However, gene-deficient mice generated by using 129-derived embryonic stem (ES) cells may carry large segments of 129 DNA, even when extensively backcrossed to reference strains, such as C57BL/6J, and this may confound interpretation of experiments performed in these mice. Tissue plasminogen activator (tPA), encoded by the PLAT gene, is a fibrinolytic serine protease that is widely expressed in the brain. A large number of neurological abnormalities have been reported in tPA-deficient mice. The studies here compare genes differentially expressed in the brains of Plat-/- mice from two independent Plat-/- mouse derivations to wild-type C57BL/6J mice. One strain denoted “Old” was constructed in ES cells from a 129 mouse and backcrossed extensively to C57BL/6J, and one denoted “New” Plat-/- mouse was constructed using zinc finger nucleases directly in the C57BL/6J-Plat-/- mouse strain. We identify a significant set of genes that are differentially expressed in the brains of Old Plat-/- mice that preferentially cluster in the vicinity of Plat on chromosome 8, apparently linked to more than 20 Mbp of DNA flanking Plat being of 129 origin. No such clustering is seen in the New Plat-/- mice.
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