scholarly journals Efficacy of CDK4/6 inhibitors in preclinical models of malignant pleural mesothelioma

2021 ◽  
Author(s):  
Elisabet Aliagas ◽  
Ania Alay ◽  
Maria Martínez-Iniesta ◽  
Miguel Hernández-Madrigal ◽  
David Cordero ◽  
...  
Keyword(s):  
Cell Cycle ◽  
Cell Proliferation ◽  
Overall Survival ◽  
Cell Cycle Arrest ◽  
Malignant Pleural Mesothelioma ◽  
Pleural Mesothelioma ◽  
Preclinical Studies ◽  
Preclinical Models ◽  
Cycle Arrest

AbstractThere is no effective therapy for patients with malignant pleural mesothelioma (MPM) who progressed to platinum-based chemotherapy and immunotherapy. Here, we investigate the antitumor activity of CDK4/6 inhibitors using in vitro and in vivo preclinical models of MPM. Based on publicly available transcriptomic data of MPM, patients with CDK4 or CDK6 overexpression had shorter overall survival. Treatment with abemaciclib or palbociclib at 100 nM significantly decreased cell proliferation in all cell models. Both CDK4/6 inhibitors significantly induced G1 cell cycle arrest thereby increasing cell senescence and increased the expression of interferon signaling pathway and tumor antigen presentation process in culture models of MPM. In vivo preclinical studies showed that palbociclib significantly reduced tumor growth and prolonged overall survival in a platinum-naïve and platinum resistant MPM mouse model. Treatment of MPM with CDK4/6 inhibitors decreased cell proliferation, mainly by promoting cell cycle arrest at G1 and by induction of cell senescence. Our preclinical studies provide evidence for evaluating CDK4/6 inhibitors in the clinic for the treatment of MPM.

scholarly journals Roquin1 Suppresses Breast Cancer Growth by Inducing Cell Cycle Arrest via Selectively Destabilizing Cell Cycle–Promoting Gene mRNAs

2020 ◽  
Author(s):  
Wenbao Lu ◽  
Meicen Zhou ◽  
Bing Wang ◽  
Xueting Liu ◽  
Bingwei Li
Keyword(s):  
Breast Cancer ◽  
Cell Cycle ◽  
Cell Proliferation ◽  
Cell Cycle Arrest ◽  
Breast Cancer Cell ◽  
Breast Tumor ◽  
Cell Cycle Progression ◽  
Cycle Progression ◽  
Cycle Arrest

Abstract Background: Dysregulation of cell cycle progression is one of the common features of human cancer cells, however, its mechanism remains unclear. This study aims to clarify the role and the underlying mechanisms of Roquin1 in cell cycle arrest induction in breast cancer.Methods: Public cancer databases were analyzed to identify the expression pattern of Roquin1 in human breast cancers and the significant association with patient survival. Quantitative real-time PCR and western blots were performed to detect the expression of Roquin1 in breast cancer samples and cell lines. Cell counting, MTT assay, flow cytometry, and in vivo study were conducted to investigate the effects of Roquin1 on cell proliferation, cell cycle progression and tumor progression. RNA-sequencing was applied to identify the differential genes and pathways regulated by Roquin1. RNA immunoprecipitation assay, luciferase reporter assay, mRNA half-life detection, RNA affinity binding assay, and RIP-ChIP were used to explore the molecular mechanisms of Roquin1.Results: We showed that Roquin1 expression in breast cancer tissues and cell lines was inhibited, and the reduction in Roquin1 expression was associated with poor overall survival and relapse free survival of patients with breast cancer. Roquin1 overexpression inhibited breast cancer cell proliferation and induced G1/S cell cycle arrest without causing significant apoptosis. In contrast, knockdown of Roquin1 promoted breast cancer cell growth and cycle progression. Moreover, in vivo induction of Roquin1 by adenovirus significantly suppressed breast tumor growth and metastasis. Mechanistically, Roquin1 selectively destabilizing cell cycle–promoting genes, including Cyclin D1, Cyclin E1, cyclin dependent kinase 6 (CDK6) and minichromosome maintenance 2 (MCM2) through targeting the stem–loop structure in the 3’untranslated region (3’UTR) of mRNAs via its ROQ domain, leading to the downregulation of cell cycle–promoting mRNAs.Conclusions: Our findings demonstrated that Roquin1 was a novel breast tumor suppressor and could induce G1/S cell cycle arrest by selectively downregulating the expression of cell cycle–promoting genes, which might as a potential molecular target for breast cancer treatment.

Resveratrol induces cell cycle arrest and apoptosis in epithelioid malignant pleural mesothelioma cells

2017 ◽  
Vol 43 (2) ◽  
pp. 197-204
Author(s):  
Saime Batirel ◽  
Ergul Mutlu Altundag ◽  
Selina Toplayici ◽  
Ceyda Corek ◽  
Hasan Fevzi Batirel
Keyword(s):  
Cell Cycle ◽  
Cell Viability ◽  
Cyclin D1 ◽  
Cell Cycle Arrest ◽  
Malignant Pleural Mesothelioma ◽  
Cell Cycle Distribution ◽  
Pleural Mesothelioma ◽  
Dependent Manner ◽  
P53 Expression ◽  
Cycle Arrest

Abstract Background: Resveratrol is a natural anti-carcinogenic polyphenol. Malignant pleural mesothelioma (MPM) is an aggressive tumor with poor prognosis. In this study, we investigated the effects of resveratrol on epithelioid MPM. Material and methods: Human epithelioid MPM cell line (NCI-H2452) was exposed to resveratrol (5–200 μM) for 24 or 48 h. Cell viability was assessed by WST-1 assay. Flow cytometry analyses were performed to evaluate the effects of resveratrol on cell cycle distribution and apoptosis. Western blot analysis was used to determine protein expression levels of antioxidant enzymes, cyclin D1 and p53. Reactive oxygen species (ROS) were measured using H2DCFDA. Results: Resveratrol reduced cell viability of the cells in a concentration and time dependent manner. After treatment, the cells accumulated in G0/G1 phase and the percentage of cells in G2/M phase was reduced. Resveratrol decreased cyclin D1 and increased p53 expression in cell lysates. Treated cells exhibited increased apoptotic activity. ROS were elevated with resveratrol treatment, but there was no change in the expression of superoxide dismutase (SOD)-1, SOD-2 and glutathione peroxidase. Conclusion: Our results revealed that resveratrol exhibits anti-cell viability effect on epithelioid MPM cells by inducing cell cycle arrest and apoptosis. Resveratrol may become a potential therapeutic agent for epithelioid MPM.

scholarly journals Roquin1 inhibits the proliferation of breast cancer cells by inducing G1/S cell cycle arrest via selectively destabilizing the mRNAs of cell cycle–promoting genes

2020 ◽  
Author(s):  
Wenbao Lu ◽  
Meicen Zhou ◽  
Bing Wang ◽  
Xueting Liu ◽  
Bingwei Li
Keyword(s):  
Breast Cancer ◽  
Cell Cycle ◽  
Cell Proliferation ◽  
Cell Cycle Arrest ◽  
Cancer Cells ◽  
Breast Tumor ◽  
Cell Cycle Progression ◽  
Cycle Progression ◽  
Cycle Arrest

Abstract Background: Dysregulation of cell cycle progression is a common feature of human cancer cells; however, its mechanism remains unclear. This study aims to clarify the role and the underlying mechanisms of Roquin1 in cell cycle arrest in breast cancer.Methods: Public cancer databases were analyzed to identify the expression pattern of Roquin1 in human breast cancers and its association with patient survival. Quantitative real-time PCR and Western blots were performed to detect the expression of Roquin1 in breast cancer samples and cell lines. Cell counting, MTT assays, flow cytometry, and in vivo analyses were conducted to investigate the effects of Roquin1 on cell proliferation, cell cycle progression and tumor progression. RNA sequencing was applied to identify the differentially expressed genes regulated by Roquin1. RNA immunoprecipitation assay, luciferase reporter assay, mRNA half-life detection, RNA affinity binding assay, and RIP-ChIP were used to explore the molecular mechanisms of Roquin1.Results: We showed that Roquin1 expression in breast cancer tissues and cell lines was inhibited, and the reduction in Roquin1 expression was associated with poor overall survival and relapse-free survival of patients with breast cancer. Roquin1 overexpression inhibited cell proliferation and induced G1/S cell cycle arrest without causing significant apoptosis. In contrast, knockdown of Roquin1 promoted cell growth and cycle progression. Moreover, in vivo induction of Roquin1 by adenovirus significantly suppressed breast tumor growth and metastasis. Mechanistically, Roquin1 selectively destabilizes cell cycle–promoting genes, including Cyclin D1, Cyclin E1, cyclin dependent kinase 6 (CDK6) and minichromosome maintenance 2 (MCM2), by targeting the stem–loop structure in the 3' untranslated region (3'UTR) of mRNAs via its ROQ domain, leading to the downregulation of cell cycle–promoting mRNAs.Conclusions: Our findings demonstrated that Roquin1 is a novel breast tumor suppressor and could induce G1/S cell cycle arrest by selectively downregulating the expression of cell cycle–promoting genes, which might be a potential molecular target for breast cancer treatment.

scholarly journals Roquin1 inhibits the proliferation of breast cancer cells by inducing G1/S cell cycle arrest via selectively destabilizing the mRNAs of cell cycle–promoting genes

2020 ◽  
Author(s):  
Wenbao Lu ◽  
Meicen Zhou ◽  
Bing Wang ◽  
Xueting Liu ◽  
Bingwei Li
Keyword(s):  
Breast Cancer ◽  
Cell Cycle ◽  
Cell Proliferation ◽  
Cell Cycle Arrest ◽  
Cancer Cells ◽  
Breast Tumor ◽  
Cell Cycle Progression ◽  
Cycle Progression ◽  
Cycle Arrest

Abstract Background: Dysregulation of cell cycle progression is one of the common features of human cancer cells, however, its mechanism remains unclear. This study aims to clarify the role and the underlying mechanisms of Roquin1 in cell cycle arrest induction in breast cancer. Methods: Public cancer databases were analyzed to identify the expression pattern of Roquin1 in human breast cancers and the significant association with patient survival. Quantitative real-time PCR and western blots were performed to detect the expression of Roquin1 in breast cancer samples and cell lines. Cell counting, MTT assay, flow cytometry, and in vivo study were conducted to investigate the effects of Roquin1 on cell proliferation, cell cycle progression and tumor progression. RNA-sequencing was applied to identify the differential genes and pathways regulated by Roquin1. RNA immunoprecipitation assay, luciferase reporter assay, mRNA half-life detection, RNA affinity binding assay, and RIP-ChIP were used to explore the molecular mechanisms of Roquin1. Results: We showed that Roquin1 expression in breast cancer tissues and cell lines was inhibited, and the reduction in Roquin1 expression was associated with poor overall survival and relapse free survival of patients with breast cancer. Roquin1 overexpression inhibited breast cancer cell proliferation and induced G1/S cell cycle arrest without causing significant apoptosis. In contrast, knockdown of Roquin1 promoted breast cancer cell growth and cycle progression. Moreover, in vivo induction of Roquin1 by adenovirus significantly suppressed breast tumor growth and metastasis. Mechanistically, Roquin1 selectively destabilizing cell cycle–promoting genes, including Cyclin D1, Cyclin E1, cyclin dependent kinase 6 (CDK6) and minichromosome maintenance 2 (MCM2) through targeting the stem–loop structure in the 3’untranslated region (3’UTR) of mRNAs via its ROQ domain, leading to the downregulation of cell cycle–promoting mRNAs. Conclusions: Our findings demonstrated that Roquin1 was a novel breast tumor suppressor and could induce G1/S cell cycle arrest by selectively downregulating the expression of cell cycle–promoting genes, which might as a potential molecular target for breast cancer treatment.

scholarly journals CCT Chaperonin Complex Is Required for the Biogenesis of Functional Plk1

2005 ◽  
Vol 25 (12) ◽  
pp. 4993-5010 ◽  
Author(s):  
Xiaoqi Liu ◽  
Chin-Yo Lin ◽  
Ming Lei ◽  
Shi Yan ◽  
Tianhua Zhou ◽  
...  
Keyword(s):  
Cell Cycle ◽  
Cell Proliferation ◽  
Cell Cycle Arrest ◽  
Mammalian Cells ◽  
Active Form ◽  
Cycle Arrest ◽  
Cdc2 Activity ◽  
Partial Depletion

ABSTRACT Experiments from several different organisms have demonstrated that polo-like kinases are involved in many aspects of mitosis and cytokinesis. Here, we provide evidence to show that Plk1 associates with chaperonin-containing TCP1 complex (CCT) both in vitro and in vivo. Silencing of CCT by use of RNA interference (RNAi) in mammalian cells inhibits cell proliferation, decreases cell viability, causes cell cycle arrest with 4N DNA content, and leads to apoptosis. Depletion of CCT in well-synchronized HeLa cells causes cell cycle arrest at G2, as demonstrated by a low mitotic index and Cdc2 activity. Complete depletion of Plk1 in well-synchronized cells also leads to G2 block, suggesting that misfolded Plk1 might be responsible for the failure of CCT-depleted cells to enter mitosis. Moreover, partial depletion of CCT or Plk1 leads to mitotic arrest. Finally, the CCT-depleted cells reenter the cell cycle upon reintroduction of the purified constitutively active form of Plk1, indicating that Plk1 might be a CCT substrate.

scholarly journals Dysregulation of miR-23b-5p promotes cell proliferation via targeting FOXM1 in hepatocellular carcinoma

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Xinchen Yang ◽  
Shikun Yang ◽  
Jinhua Song ◽  
Wenjie Yang ◽  
Yang Ji ◽  
...  
Keyword(s):  
Hepatocellular Carcinoma ◽  
Cell Cycle ◽  
Cell Proliferation ◽  
Cell Cycle Arrest ◽  
Tumor Development ◽  
Loss Of Function ◽  
Cycle Arrest ◽  
Cell Proliferation Inhibition

AbstractGrowing evidence demonstrates that MicroRNAs (miRNAs) play an essential role in contributing to tumor development and progression. However, the underlying role and mechanisms of miR-23b-5p in hepatocellular carcinoma (HCC) formation remain unclear. Our study showed that miR-23b-5p was downregulated in the HCC tissues and cell lines, and lower expression of miR-23b-5p was associated with more severe tumor size and poorer survival. Gain- or loss-of-function assays demonstrated that miR-23b-5p induced G0/G1 cell cycle arrest and inhibited cell proliferation both in vitro and in vivo. qRT-PCR, western blot and luciferase assays verified that Mammalian transcription factor Forkhead Box M1 (FOXM1), upregulated in HCC specimens, was negatively correlated with miR-23b-5p expression and acted as a direct downstream target of miR-23b-5p. In addition, miR-23b-5p could regulate cyclin D1 and c-MYC expression by directly targeting FOXM1. Further study revealed that restoration of FOXM1 neutralized the cell cycle arrest and cell proliferation inhibition caused by miR-23b-5p. Taken together, our findings suggest that miR-23b-5p acted as a tumor suppressor role in HCC progression by targeting FOXM1 and may serve as a potential novel biomarker for HCC diagnosis and prognosis.

Role of Different C/EBPα Mutations in AML Transformation.

Blood ◽  
2008 ◽  
Vol 112 (11) ◽  
pp. 1343-1343
Author(s):  
Oscar Quintana-Bustamante ◽  
S. Lan-Lan Smith ◽  
Jude Fitzgibbon ◽  
Dominique Bonnet
Keyword(s):  
Cell Cycle ◽  
Cell Proliferation ◽  
Cell Cycle Arrest ◽  
Myeloid Differentiation ◽  
Granulocytic Differentiation ◽  
Self Renewal ◽  
Cycle Arrest

Abstract Acute Myeloid Leukemia (AML) is characterized by an abnormal hematopoietic differentiation and uncontrolled cell proliferation. Mutations in several transcription factors (TFs) have been implicated in the development of leukemia. One of these TFs is CCAAT/enhancer-binding protein-α (C/EBPα). In normal hematopoiesis, C/EBPα plays a central role to coordinate myeloid differentiation and growth arrest. C/EBPα is mutated in approximately 9% of AML; these mutations take place either in C or N terminal domains of the protein, although there are several familial cases of AML where both types of mutations have been found. We use C and/or N terminal C/EBPα mutations from one case of sporadic AML to investigate the role of each mutation in leukemic transformation (Smith et al., 2004, N Engl J Med 351, 2403–2407). Human lineage negative (Lin-) umbilical cord blood were transduced with lentiviral vectors carrying the wild type C/EBPα (WT), N terminal mutated C/EBPα (N-ter) or N and C terminal mutated (NC-ter) C/EBPα cloned from this sporadic case of AML. We observed differences in proliferation of transduced Lin- in vitro: WT C/EBPα expression resulted in G0 cell cycle arrest causing a progressive extinction of the transduced cells overtime; N-ter cells showed a higher proliferative advantage over untransduced cells. The NC-ter CEBPα cells like untransduced cells kept their levels throughout culture. Furthermore, when induced into myeloid differentiation in vitro, WT C/EBPα cells were mainly inducing fully mature granulocytes whereas N-ter C/EBPα was not able to induce terminal granulocytic differentiation; in contrast NC-ter C/EBPα did not increase myeloid differentiation. Additionally, their ability to form Colony Forming Units (CFUs) in primary, secondary and tertiary replating was also tested: WT transduced cells gave rise to few primary CFUs; contrary, N and NC-ter could generate both primary and secondary CFUs, but only NC-ter cells were able to produce CFUs in tertiary replating, indicating its ability to maintain undifferentiated hematopoietic progenitors in vitro. These results were confirmed using Long-Term Culture Initiating Cells (LTC-IC) where the NC-ter mutated cells showed the highest LTC-IC after 5 weeks. Finally, in vivo transplantation in NOD/SCID/β2mnull indicated that NC-ter mutated cells engraft better than WT and N-ter 8 week post- transplant. Serial transplantation experiments are underway to evaluate their self-renewal capacity. Our results confirmed some known functions of WT C/EBPα in human hematopoiesis, such as inducing myeloid differentiation and cell cycle arrest. On the other hand, we showed new functions for the C/EBPα mutants. The N-ter C/EBPα mutation caused an increase in cell proliferation and blockage of terminal granulocytic differentiation, whereas the NC-ter C/EBPα mutation increased the self-renewal capacity of progenitor/stem cells without having an influence on myeloid differentiation. This work provides further insight into the mechanisms by which different C/EBPα mutations induce AML.

scholarly journals Roquin1 inhibits the proliferation of breast cancer cells by inducing G1/S cell cycle arrest via selectively destabilizing the mRNAs of cell cycle–promoting genes

2020 ◽  
Vol 39 (1) ◽  
Author(s):  
Wenbao Lu ◽  
Meicen Zhou ◽  
Bing Wang ◽  
Xueting Liu ◽  
Bingwei Li
Keyword(s):  
Breast Cancer ◽  
Cell Cycle ◽  
Cell Proliferation ◽  
Cell Cycle Arrest ◽  
Cancer Cells ◽  
Breast Tumor ◽  
Cell Cycle Progression ◽  
Cycle Progression ◽  
Cycle Arrest

Abstract Background Dysregulation of cell cycle progression is a common feature of human cancer cells; however, its mechanism remains unclear. This study aims to clarify the role and the underlying mechanisms of Roquin1 in cell cycle arrest in breast cancer. Methods Public cancer databases were analyzed to identify the expression pattern of Roquin1 in human breast cancers and its association with patient survival. Quantitative real-time PCR and Western blots were performed to detect the expression of Roquin1 in breast cancer samples and cell lines. Cell counting, MTT assays, flow cytometry, and in vivo analyses were conducted to investigate the effects of Roquin1 on cell proliferation, cell cycle progression and tumor progression. RNA sequencing was applied to identify the differentially expressed genes regulated by Roquin1. RNA immunoprecipitation assay, luciferase reporter assay, mRNA half-life detection, RNA affinity binding assay, and RIP-ChIP were used to explore the molecular mechanisms of Roquin1. Results We showed that Roquin1 expression in breast cancer tissues and cell lines was inhibited, and the reduction in Roquin1 expression was associated with poor overall survival and relapse-free survival of patients with breast cancer. Roquin1 overexpression inhibited cell proliferation and induced G1/S cell cycle arrest without causing significant apoptosis. In contrast, knockdown of Roquin1 promoted cell growth and cycle progression. Moreover, in vivo induction of Roquin1 by adenovirus significantly suppressed breast tumor growth and metastasis. Mechanistically, Roquin1 selectively destabilizes cell cycle–promoting genes, including Cyclin D1, Cyclin E1, cyclin dependent kinase 6 (CDK6) and minichromosome maintenance 2 (MCM2), by targeting the stem–loop structure in the 3′ untranslated region (3’UTR) of mRNAs via its ROQ domain, leading to the downregulation of cell cycle–promoting mRNAs. Conclusions Our findings demonstrated that Roquin1 is a novel breast tumor suppressor and could induce G1/S cell cycle arrest by selectively downregulating the expression of cell cycle–promoting genes, which might be a potential molecular target for breast cancer treatment.

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