MTFP1 overexpression promotes the growth of oral squamous cell carcinoma by inducing ROS production
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Abstract Mitochondrial fission process 1 (MTFP1) is a novel nuclear‐encoded protein that promotes mitochondrial fission. Increasing lines of evidence indicate that increased mitochondrial fission is involved in carcinogenesis and tumor progression. However, the expression and biological effects of MTFP1 in cancer development is still unclear, especially in oral squamous cell carcinoma (OSCC). In this study, we first evaluated the expression of MTFP1 in 12‐paired OSCC tumor and peritumor tissues. We then explored the effects of MTFP1 knockdown or overexpression on cell growth by cell proliferation, colony formation, cell cycle, and cell apoptosis assays. Furthermore, the mechanisms by which MTFP1 promoted OSCC cell growth were explored. Our results showed that MTFP1 is frequently overexpressed in OSCC tissues. Functional experiments revealed that MTFP1 promoted the growth of OSCC cells by inducing the progression of cell cycle and suppressing cell apoptosis. Mechanistically, MTFP1 overexpression‐mediated mitochondrial fragmentation and subsequent ROS production was found to be involved in the promotion of OSCC cell growth. Collectively, our study demonstrates that MTFP1 plays a critical oncogenic role in OSCC carcinogenesis, which may serve as a potential therapeutic target in the treatment of this malignance.AAb bs st tr ra ac ct t CKBM is a natural product that exhibits a novel anti-tumor activity through the induction of cell cycle arrest and apoptosis.We have investigated its effects on cell cycle regulation using a gastric cancer cell line, AGS.The effects of CKBM on cell proliferation, cell cycle regulation and apoptosis were analyzed using BrdU (5-bromo-2'-deoxyuridine) cell proliferation assay and flow cytometric analysis, respectively.Specific cellular protein expressions were measured using Western blot analysis.Flow cytometric analysis indicated that CKBM induced G2/M cell cycle arrest and apoptosis, whereas differential protein expressions of p21, p53 and 14-3-3σ (stratifin) using Western blot analysis were enhanced.The differential expressions of p21, p53 and 14-3-3σ in AGS cancer cells after CKBM treatment may play critical roles in the G2/M cell cycle arrest that blocks cell proliferation and induces apoptosis. KKe ey y w wo or rd ds s 14-3-3σ (stratifin), G2/M arrest, cell proliferation, checkpoint protein
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Background: Ligustrazine, active ingredients extracted from the natural herb Ligusticum Chuanxiong Hort, has promising anti-tumor properties on tumor cell lines. However, the potential anti-tumor activity of ligustrazine on colorectal cancer (CRC) cells and the molecular mechanisms have not been elucidated. In this study, we explored the critical functions of ligustrazine on SW480 and CT26 cells at cellular levels. Methods: CCK-8 assay was performed to analyze the cell viability. Flow cytometry analysis was applied to study cell apoptosis and cell cycle. The expressions of cell apoptosis and cell cycle-associated proteins were conducted by western blot and qRT-PCR analysis. Results: Ligustrazine showed significant inhibitory effects on the proliferation of SW480 and CT26 cells. Ligustrazine induced cell apoptosis was associated with the up-regulation of pro-apoptotic protein and the down-regulation of anti-apoptotic protein in an activated mitochondrial-dependent pathway. And it indicated that ligustrazine induced cell cycle arrest by changing the cell cycle distribution, which leads to cell cycle arrest at the G0/G1 phase. Besides, the ligustrazine-induced cell apoptosis and cell cycle arrest were markedly reversed by pifithrin-α (p53 inhibitor), which suggested that ligustrazine-induced cell apoptosis was achieved by regulating p53-dependent mitochondrial pathway and cell cycle arrest at the G0/G1 phase. Conclusions: These findings demonstrated that ligustrazine could induce SW480 and CT26 cells apoptosis via a p53-dependent mitochondrial pathway and cell cycle arrest at the G0/G1 phase. Ligustrazine may serve as a potential anti-cancer agent for CRC.
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When the DNA damage is generated, the tumor suppressor gene p53 is activated and selects the cell fate such as the cell cycle arrest, the DNA repair and the induction of apoptosis. Recently, the p53 oscillation was observed in MCF7 cell line. However, the biological meaning of p53 oscillation was still unclear. Here, we constructed a novel mathematical model of cell cycle regulatory system with p53 signaling network to investigate the relationship between the p53 oscillation and the cell cycle progression. First, the simulated result without DNA damage agreed with the biological findings. Next, the simulations with DNA damage realized both the p53 oscillation and the cell cycle arrest, and indicated that the generation of multiple p53 pulses disrupted the cell cycle progression. Moreover, the simulated results showed that the cell cycle disruption was caused by the catastrophe of M phase in the cell cycle, which resulted from the decline in cyclin A/cyclin-dependent kinase 2. The results in this study suggested that the generation of multiple p53 pulses against DNA damage may be used as a marker of cell cycle disruption.
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The cell cycle is an orderly sequence of events which ultimately lead to the division of a single cell into two daughter cells. In the case of DNA damage by radiation or chemicals, the damage checkpoints in the G1 and G2 phases of the cell cycle are activated. This results in an arrest of the cell cycle so that the DNA damage can be repaired. Once this is done, the cell continues with its usual cycle of activity. We study a mathematical model of the DNA damage checkpoint in the G2 phase which arrests the transition from the G2 to the M (mitotic) phase of the cell cycle. The tumor suppressor protein p53 plays a key role in activating the pathways leading to cell cycle arrest in mammalian systems. If the DNA damage is severe, the p53 proteins activate other pathways which bring about apoptosis, i.e., programmed cell death. Loss of the p53 gene results in the proliferation of cells containing damaged DNA, i.e., in the growth of tumors which may ultimately become cancerous. There is some recent experimental evidence which suggests that the mutation of a single copy of the p53 gene (in the normal cell each gene has two identical copies) is sufficient to trigger the formation of tumors. We study the effect of reducing the gene copy number of the p53 and two other genes on cell cycle arrest and obtain results consistent with experimental observations.
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Plant-derived polyphenols are being tested as chemopreventive agents; some polyphenols arrest the cell cycle at G1 phase, whereas others inhibit cell cycle proliferation at G2/M phase. Therefore, polyphenols have been proposed to inhibit cell cycle progression at different phases via distinct mechanisms. Indeed, our previous studies showed that small structural differences in polyphenols cause large differences in their biological activities; however, the details of the structural properties causing G1 cell cycle arrest remain unknown. In this study, we prepared 27 polyphenols, including eight different scaffolds, to gain insight into the structural conditions that arrest the cell cycle at G1 phase in a quantitative structure–activity relationship study. We used cell cycle profiles to determine the biophores responsible for G1 cell cycle arrest and believe that the biophores identified in this study will help design polyphenols that cause G1 cell cycle arrest.
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Yeast Fis1p participates in mitochondrial fission, together with Dnm1p and Mdv1p. Recently, human Fis1 (hFis1) was reported to be involved in mitochondrial fission, together with Drp1. We established stable transformants with an hFis1 siRNA expression vector. In the stable hFis1 knockdown cells, hFis1 expression was suppressed to approximately 10%, and mitochondrial fission, induced by cisplatin treatment, was delayed. In addition, mouse Fis1 (mFis1) expression promoted mitochondrial fission and cell death in the hFis1 knockdown cells, suggesting that mFis1 complements the function of hFis1. These hFis1 siRNA expression vectors may be useful for studying the molecular function of mammalian Fis1.
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Cell cycle arrest after different types of DNA damage can occur in either G1 phase or G2 phase of the cell cycle, involving the distinct mechanisms of p53/p21 Cip1/Waf1 induction, and phosphorylation of Cdc2, respectively. Treatment of asynchronously growing Swiss3T3 cells with the chemotherapeutic drug adriamycin induced a predominantly G2 cell cycle arrest. Here we investigate why Swiss3T3 cells were arrested in G2 phase and not in G1 phase after adriamycin‐induced damage. We show that adriamycin was capable of inducing a G1 cell cycle arrest, both during the G0‐G1 transition and during the G1 phase of the normal cell cycle. In G0 cells, adriamycin induced a prolonged cell cycle arrest. However, adriamycin caused only a transient cell cycle delay when added to cells at later time points during G0‐G1 transition or at the G1 phase of normal cell cycle. The G1 arrest correlated with the induction of p53 and p21 Cip1/Waf1 , and the exit from the arrest correlated with the decline of their expression. In contrast to the G1 arrest, adriamycin‐induced G2 arrest was relatively tight and correlated with the Thr‐14/Tyr‐15 phosphorylation of cyclin B‐Cdc2 complexes. The relative stringency of the G1 versus G2 cell cycle arrest may explain the predominance of G2 arrest after adriamycin treatment in mammalian cells.
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