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Wang Y, Sun J, Sun B, Zhang C, Tian Z, Wang L, Li J. The genetic and immune features of salivary gland secretory carcinoma with high-grade transformation. Oral Dis 2024; 30:4320-4330. [PMID: 38263601 DOI: 10.1111/odi.14876] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2023] [Revised: 12/26/2023] [Accepted: 01/11/2024] [Indexed: 01/25/2024]
Abstract
OBJECTIVES To compare the clinicopathological, molecular, and immune features of conventional and high-grade transformation (HGT) secretory carcinoma (SC) in salivary glands. MATERIALS AND METHODS The clinicopathological data of 88 cases including 74 conventional SCs and 14 SCs with HGT were reviewed. Targeted next-generation sequencing was performed in 11 SCs with HGT and 7 conventional SCs. The level of PD-L1 and CD8+ TILs was determined by immunohistochemistry. RESULTS Compared with the conventional group, the rates of nodal metastasis, local recurrence, distant metastasis and mortality were significantly higher in the HGT cohort. Mutations of ARID1A/B, KMT2A, HOXD13, NRG1 and ETV6 genes were identified in HGT SCs. A recurrent E307G mutation in GATA6 gene was also observed in two cases. Two deceased HGT patients with distant metastasis harboured NOTCH3 mutations. ETV6-RET translocation was prone to occur in the HGT SCs. Additionally, PD-L1 expression was low, and CD8+ TILs were sparse in most HGT cases. CONCLUSION Our findings reveal novel gene alterations involved in the progression of HGT in SCs. Most HGT SCs patients cannot benefit from PD-L1 blocking and may be approached with a distinct treatment strategy including the lymph node dissection and application of molecular target drugs in precision oncology.
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Affiliation(s)
- Yu Wang
- Shanghai Key Laboratory of Stomatology, Department of Oral Pathology, Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Jingjing Sun
- Shanghai Key Laboratory of Stomatology, Department of Oral Pathology, Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Bao Sun
- Shanghai Key Laboratory of Stomatology, Department of Oral Pathology, Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Chunye Zhang
- Shanghai Key Laboratory of Stomatology, Department of Oral Pathology, Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Zhen Tian
- Shanghai Key Laboratory of Stomatology, Department of Oral Pathology, Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Lizhen Wang
- Shanghai Key Laboratory of Stomatology, Department of Oral Pathology, Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Jiang Li
- Shanghai Key Laboratory of Stomatology, Department of Oral Pathology, Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
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2
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Hansen E, Rolling C, Wang M, Holaska JM. Emerin deficiency drives MCF7 cells to an invasive phenotype. Sci Rep 2024; 14:19998. [PMID: 39198511 PMCID: PMC11358522 DOI: 10.1038/s41598-024-70752-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2024] [Accepted: 08/20/2024] [Indexed: 09/01/2024] Open
Abstract
During metastasis, cancer cells traverse the vasculature by squeezing through very small gaps in the endothelium. Thus, nuclei in metastatic cancer cells must become more malleable to move through these gaps. Our lab showed invasive breast cancer cells have 50% less emerin protein resulting in smaller, misshapen nuclei, and higher metastasis rates than non-cancerous controls. Thus, emerin deficiency was predicted to cause increased nuclear compliance, cell migration, and metastasis. We tested this hypothesis by downregulating emerin in noninvasive MCF7 cells and found emerin knockdown causes smaller, dysmorphic nuclei, resulting in increased impeded cell migration. Emerin reduction in invasive breast cancer cells showed similar results. Supporting the clinical relevance of emerin reduction in cancer progression, our analysis of 192 breast cancer patient samples showed emerin expression inversely correlates with cancer invasiveness. We conclude emerin loss is an important driver of invasive transformation and has utility as a biomarker for tumor progression.
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Affiliation(s)
- Emily Hansen
- Department of Biomedical Sciences, Cooper Medical School of Rowan University, MEB 534, 401 South Broadway, Camden, NJ, 08103, USA
- Molecular and Cell Biology and Neuroscience Program, Rowan-Virtua School of Translational Biomedical Engineering and Sciences, Stratford, NJ, 08084, USA
| | - Christal Rolling
- Department of Biomedical Sciences, Cooper Medical School of Rowan University, MEB 534, 401 South Broadway, Camden, NJ, 08103, USA
- Molecular and Cell Biology and Neuroscience Program, Rowan-Virtua School of Translational Biomedical Engineering and Sciences, Stratford, NJ, 08084, USA
| | - Matthew Wang
- Department of Biomedical Sciences, Cooper Medical School of Rowan University, MEB 534, 401 South Broadway, Camden, NJ, 08103, USA
- Rowan-Virtua School of Osteopathic Medicine, Stratford, NJ, 08084, USA
| | - James M Holaska
- Department of Biomedical Sciences, Cooper Medical School of Rowan University, MEB 534, 401 South Broadway, Camden, NJ, 08103, USA.
- Molecular and Cell Biology and Neuroscience Program, Rowan-Virtua School of Translational Biomedical Engineering and Sciences, Stratford, NJ, 08084, USA.
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3
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Hansen E, Rolling C, Wang M, Holaska JM. Emerin deficiency drives MCF7 cells to an invasive phenotype. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2024.02.21.581379. [PMID: 38712242 PMCID: PMC11071294 DOI: 10.1101/2024.02.21.581379] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2024]
Abstract
During metastasis, cancer cells traverse the vasculature by squeezing through very small gaps in the endothelium. Thus, nuclei in metastatic cancer cells must become more malleable to move through these gaps. Our lab showed invasive breast cancer cells have 50% less emerin protein resulting in smaller, misshapen nuclei, and higher metastasis rates than non-cancerous controls. Thus, emerin deficiency was predicted to cause increased nuclear compliance, cell migration, and metastasis. We tested this hypothesis by downregulating emerin in noninvasive MCF7 cells and found emerin knockdown causes smaller, dysmorphic nuclei, resulting in increased impeded cell migration. Emerin reduction in invasive breast cancer cells showed similar results. Supporting the clinical relevance of emerin reduction in cancer progression, our analysis of 192 breast cancer patient samples showed emerin expression inversely correlates with cancer invasiveness. We conclude emerin loss is an important driver of invasive transformation and has utility as a biomarker for tumor progression.
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Affiliation(s)
- Emily Hansen
- Department of Biomedical Sciences, Cooper Medical School of Rowan University, Camden, NJ
- Molecular and Cell Biology and Neuroscience Program, Rowan-Virtua School of Translational Biomedical Engineering and Sciences, Stratford, NJ
| | - Christal Rolling
- Department of Biomedical Sciences, Cooper Medical School of Rowan University, Camden, NJ
- Molecular and Cell Biology and Neuroscience Program, Rowan-Virtua School of Translational Biomedical Engineering and Sciences, Stratford, NJ
| | - Matthew Wang
- Department of Biomedical Sciences, Cooper Medical School of Rowan University, Camden, NJ
- Rowan-Virtua School of Osteopathic Medicine
| | - James M. Holaska
- Department of Biomedical Sciences, Cooper Medical School of Rowan University, Camden, NJ
- Molecular and Cell Biology and Neuroscience Program, Rowan-Virtua School of Translational Biomedical Engineering and Sciences, Stratford, NJ
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4
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Tuning between Nuclear Organization and Functionality in Health and Disease. Cells 2023; 12:cells12050706. [PMID: 36899842 PMCID: PMC10000962 DOI: 10.3390/cells12050706] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2022] [Revised: 02/08/2023] [Accepted: 02/20/2023] [Indexed: 02/25/2023] Open
Abstract
The organization of eukaryotic genome in the nucleus, a double-membraned organelle separated from the cytoplasm, is highly complex and dynamic. The functional architecture of the nucleus is confined by the layers of internal and cytoplasmic elements, including chromatin organization, nuclear envelope associated proteome and transport, nuclear-cytoskeletal contacts, and the mechano-regulatory signaling cascades. The size and morphology of the nucleus could impose a significant impact on nuclear mechanics, chromatin organization, gene expression, cell functionality and disease development. The maintenance of nuclear organization during genetic or physical perturbation is crucial for the viability and lifespan of the cell. Abnormal nuclear envelope morphologies, such as invagination and blebbing, have functional implications in several human disorders, including cancer, accelerated aging, thyroid disorders, and different types of neuro-muscular diseases. Despite the evident interplay between nuclear structure and nuclear function, our knowledge about the underlying molecular mechanisms for regulation of nuclear morphology and cell functionality during health and illness is rather poor. This review highlights the essential nuclear, cellular, and extracellular components that govern the organization of nuclei and functional consequences associated with nuclear morphometric aberrations. Finally, we discuss the recent developments with diagnostic and therapeutic implications targeting nuclear morphology in health and disease.
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5
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Sehgal P, Chaturvedi P. Chromatin and Cancer: Implications of Disrupted Chromatin Organization in Tumorigenesis and Its Diversification. Cancers (Basel) 2023; 15:cancers15020466. [PMID: 36672415 PMCID: PMC9856863 DOI: 10.3390/cancers15020466] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2022] [Revised: 01/04/2023] [Accepted: 01/09/2023] [Indexed: 01/15/2023] Open
Abstract
A hallmark of cancers is uncontrolled cell proliferation, frequently associated with an underlying imbalance in gene expression. This transcriptional dysregulation observed in cancers is multifaceted and involves chromosomal rearrangements, chimeric transcription factors, or altered epigenetic marks. Traditionally, chromatin dysregulation in cancers has been considered a downstream effect of driver mutations. However, here we present a broader perspective on the alteration of chromatin organization in the establishment, diversification, and therapeutic resistance of cancers. We hypothesize that the chromatin organization controls the accessibility of the transcriptional machinery to regulate gene expression in cancerous cells and preserves the structural integrity of the nucleus by regulating nuclear volume. Disruption of this large-scale chromatin in proliferating cancerous cells in conventional chemotherapies induces DNA damage and provides a positive feedback loop for chromatin rearrangements and tumor diversification. Consequently, the surviving cells from these chemotherapies become tolerant to higher doses of the therapeutic reagents, which are significantly toxic to normal cells. Furthermore, the disorganization of chromatin induced by these therapies accentuates nuclear fragility, thereby increasing the invasive potential of these tumors. Therefore, we believe that understanding the changes in chromatin organization in cancerous cells is expected to deliver more effective pharmacological interventions with minimal effects on non-cancerous cells.
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6
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Wang Y, Xie H, Chang X, Hu W, Li M, Li Y, Liu H, Cheng H, Wang S, Zhou L, Shen D, Dou S, Ma R, Mao Y, Zhu H, Zhang X, Zheng Y, Ye X, Wen L, Kee K, Cui H, Tang F. Single-Cell Dissection of the Multiomic Landscape of High-Grade Serous Ovarian Cancer. Cancer Res 2022; 82:3903-3916. [PMID: 35969151 PMCID: PMC9627134 DOI: 10.1158/0008-5472.can-21-3819] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2021] [Revised: 04/30/2022] [Accepted: 08/09/2022] [Indexed: 01/07/2023]
Abstract
High-grade serous cancer (HGSC) is the most common subtype of ovarian cancer. HGSC is highly aggressive with poor patient outcomes, and a deeper understanding of HGSC tumorigenesis could help guide future treatment development. To systematically characterize the underlying pathologic mechanisms and intratumoral heterogeneity in human HGSC, we used an optimized single-cell multiomics sequencing technology to simultaneously analyze somatic copy-number alterations (SCNA), DNA methylation, chromatin accessibility, and transcriptome in individual cancer cells. Genes associated with interferon signaling, metallothioneins, and metabolism were commonly upregulated in ovarian cancer cells. Integrated multiomics analyses revealed that upregulation of interferon signaling and metallothioneins was influenced by both demethylation of their promoters and hypomethylation of satellites and LINE1, and potential key transcription factors regulating glycolysis using chromatin accessibility data were uncovered. In addition, gene expression and DNA methylation displayed similar patterns in matched primary and abdominal metastatic tumor cells of the same genetic lineage, suggesting that metastatic cells potentially preexist in the subclones of primary tumors. Finally, the lineages of cancer cells with higher residual DNA methylation levels and upregulated expression of CCN1 and HSP90AA1 presented greater metastatic potential. This study characterizes the critical genetic, epigenetic, and transcriptomic features and their mutual regulatory relationships in ovarian cancer, providing valuable resources for identifying new molecular mechanisms and potential therapeutic targets for HGSC. SIGNIFICANCE Integrated analysis of multiomic changes and epigenetic regulation in high-grade serous ovarian cancer provides insights into the molecular characteristics of this disease, which could help improve diagnosis and treatment.
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Affiliation(s)
- Yicheng Wang
- School of Life Sciences, Biomedical Pioneering Innovation Center, Department of Obstetrics and Gynecology, People's Hospital, Peking University, Beijing, China.,Ministry of Education Key Laboratory of Cell Proliferation and Differentiation, Peking University, Beijing, China
| | - Haoling Xie
- School of Life Sciences, Biomedical Pioneering Innovation Center, Department of Obstetrics and Gynecology, People's Hospital, Peking University, Beijing, China.,Ministry of Education Key Laboratory of Cell Proliferation and Differentiation, Peking University, Beijing, China
| | - Xiaohong Chang
- School of Life Sciences, Biomedical Pioneering Innovation Center, Department of Obstetrics and Gynecology, People's Hospital, Peking University, Beijing, China.,Center of Gynecologic Oncology, People's Hospital, Peking University, Beijing, China
| | - Wenqi Hu
- Center for Stem Cell Biology and Regenerative Medicine, Department of Basic Medical Sciences, School of Medicine, Tsinghua University, Beijing, China
| | - Mengyao Li
- Center for Stem Cell Biology and Regenerative Medicine, Department of Basic Medical Sciences, School of Medicine, Tsinghua University, Beijing, China
| | - Yi Li
- School of Life Sciences, Biomedical Pioneering Innovation Center, Department of Obstetrics and Gynecology, People's Hospital, Peking University, Beijing, China.,Center of Gynecologic Oncology, People's Hospital, Peking University, Beijing, China
| | - Huiping Liu
- School of Life Sciences, Biomedical Pioneering Innovation Center, Department of Obstetrics and Gynecology, People's Hospital, Peking University, Beijing, China.,Center of Gynecologic Oncology, People's Hospital, Peking University, Beijing, China
| | - Hongyan Cheng
- School of Life Sciences, Biomedical Pioneering Innovation Center, Department of Obstetrics and Gynecology, People's Hospital, Peking University, Beijing, China.,Center of Gynecologic Oncology, People's Hospital, Peking University, Beijing, China
| | - Shang Wang
- School of Life Sciences, Biomedical Pioneering Innovation Center, Department of Obstetrics and Gynecology, People's Hospital, Peking University, Beijing, China.,Center of Gynecologic Oncology, People's Hospital, Peking University, Beijing, China
| | - Ling Zhou
- School of Life Sciences, Biomedical Pioneering Innovation Center, Department of Obstetrics and Gynecology, People's Hospital, Peking University, Beijing, China.,Center of Gynecologic Oncology, People's Hospital, Peking University, Beijing, China
| | - Danhua Shen
- Department of Pathology, People's Hospital, Peking University, Beijing, China
| | - Sha Dou
- School of Life Sciences, Biomedical Pioneering Innovation Center, Department of Obstetrics and Gynecology, People's Hospital, Peking University, Beijing, China.,Center of Gynecologic Oncology, People's Hospital, Peking University, Beijing, China
| | - Ruiqiong Ma
- School of Life Sciences, Biomedical Pioneering Innovation Center, Department of Obstetrics and Gynecology, People's Hospital, Peking University, Beijing, China.,Center of Gynecologic Oncology, People's Hospital, Peking University, Beijing, China
| | - Yunuo Mao
- School of Life Sciences, Biomedical Pioneering Innovation Center, Department of Obstetrics and Gynecology, People's Hospital, Peking University, Beijing, China.,Ministry of Education Key Laboratory of Cell Proliferation and Differentiation, Peking University, Beijing, China
| | - Honglan Zhu
- School of Life Sciences, Biomedical Pioneering Innovation Center, Department of Obstetrics and Gynecology, People's Hospital, Peking University, Beijing, China.,Center of Gynecologic Oncology, People's Hospital, Peking University, Beijing, China
| | - Xiaobo Zhang
- Department of Pathology, People's Hospital, Peking University, Beijing, China
| | - Yuxuan Zheng
- School of Life Sciences, Biomedical Pioneering Innovation Center, Department of Obstetrics and Gynecology, People's Hospital, Peking University, Beijing, China.,Ministry of Education Key Laboratory of Cell Proliferation and Differentiation, Peking University, Beijing, China
| | - Xue Ye
- School of Life Sciences, Biomedical Pioneering Innovation Center, Department of Obstetrics and Gynecology, People's Hospital, Peking University, Beijing, China.,Center of Gynecologic Oncology, People's Hospital, Peking University, Beijing, China
| | - Lu Wen
- School of Life Sciences, Biomedical Pioneering Innovation Center, Department of Obstetrics and Gynecology, People's Hospital, Peking University, Beijing, China.,Ministry of Education Key Laboratory of Cell Proliferation and Differentiation, Peking University, Beijing, China
| | - Kehkooi Kee
- Center for Stem Cell Biology and Regenerative Medicine, Department of Basic Medical Sciences, School of Medicine, Tsinghua University, Beijing, China.,Corresponding Authors: Fuchou Tang, Beijing Advanced Innovation Center for Genomics, School of Life Sciences, Peking University, Beijing 100871, China. E-mail: ; Heng Cui, Peking University People's Hospital, 11 Xizhimen South Street, Xicheng District, Beijing 100044, China. E-mail: ; and Kehkooi Kee, Tsinghua University, 30 Shuangqing Road, Beijing 100084, China. E-mail:
| | - Heng Cui
- School of Life Sciences, Biomedical Pioneering Innovation Center, Department of Obstetrics and Gynecology, People's Hospital, Peking University, Beijing, China.,Center of Gynecologic Oncology, People's Hospital, Peking University, Beijing, China.,Corresponding Authors: Fuchou Tang, Beijing Advanced Innovation Center for Genomics, School of Life Sciences, Peking University, Beijing 100871, China. E-mail: ; Heng Cui, Peking University People's Hospital, 11 Xizhimen South Street, Xicheng District, Beijing 100044, China. E-mail: ; and Kehkooi Kee, Tsinghua University, 30 Shuangqing Road, Beijing 100084, China. E-mail:
| | - Fuchou Tang
- School of Life Sciences, Biomedical Pioneering Innovation Center, Department of Obstetrics and Gynecology, People's Hospital, Peking University, Beijing, China.,Ministry of Education Key Laboratory of Cell Proliferation and Differentiation, Peking University, Beijing, China.,Corresponding Authors: Fuchou Tang, Beijing Advanced Innovation Center for Genomics, School of Life Sciences, Peking University, Beijing 100871, China. E-mail: ; Heng Cui, Peking University People's Hospital, 11 Xizhimen South Street, Xicheng District, Beijing 100044, China. E-mail: ; and Kehkooi Kee, Tsinghua University, 30 Shuangqing Road, Beijing 100084, China. E-mail:
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7
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Singh I, Lele TP. Nuclear Morphological Abnormalities in Cancer: A Search for Unifying Mechanisms. Results Probl Cell Differ 2022; 70:443-467. [PMID: 36348118 PMCID: PMC9722227 DOI: 10.1007/978-3-031-06573-6_16] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Irregularities in nuclear shape and/or alterations to nuclear size are a hallmark of malignancy in a broad range of cancer types. Though these abnormalities are commonly used for diagnostic purposes and are often used to assess cancer progression in the clinic, the mechanisms through which they occur are not well understood. Nuclear size alterations in cancer could potentially arise from aneuploidy, changes in osmotic coupling with the cytoplasm, and perturbations to nucleocytoplasmic transport. Nuclear shape changes may occur due to alterations to cell-generated mechanical stresses and/or alterations to nuclear structural components, which balance those stresses, such as the nuclear lamina and chromatin. A better understanding of the mechanisms underlying abnormal nuclear morphology and size may allow the development of new therapeutics to target nuclear aberrations in cancer.
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Affiliation(s)
- Ishita Singh
- Department of Biomedical Engineering, Texas A&M University, College Station, TX, USA
| | - Tanmay P. Lele
- Department of Biomedical Engineering, Texas A&M University, College Station, TX, USA,Department of Chemical Engineering, University of Florida, Gainesville, FL, USA,Department of Translational Medical Sciences, Texas A&M University, Houston, TX, USA
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8
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Ewers KM, Patil S, Kopp W, Thomale J, Quilitz T, Magerhans A, Wang X, Hessmann E, Dobbelstein M. HSP90 Inhibition Synergizes with Cisplatin to Eliminate Basal-like Pancreatic Ductal Adenocarcinoma Cells. Cancers (Basel) 2021; 13:cancers13246163. [PMID: 34944784 PMCID: PMC8699576 DOI: 10.3390/cancers13246163] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2021] [Revised: 11/30/2021] [Accepted: 12/03/2021] [Indexed: 12/20/2022] Open
Abstract
Simple Summary Pancreatic cancer is currently difficult to treat, but the drug cisplatin represents one of the most important therapeutic options. We find that cells derived from this cancer fall into two classes regarding their sensitivity towards cisplatin, and we observe that cells with high expression levels of GATA6 and microRNA 200 are mostly sensitive. However, those cells that respond poorly to cisplatin can be sensitized by drugs that inhibit HSP90, a protein that helps other proteins to fold properly. This was also found in a mouse model of pancreatic cancer. Our results suggest that the combination of cisplatin with HSP90-inhibitory drugs might improve the treatment of pancreatic cancer. Abstract To improve the treatment of pancreatic ductal adenocarcinoma (PDAC), a promising strategy consists of personalized chemotherapy based on gene expression profiles. Investigating a panel of PDAC-derived human cell lines, we found that their sensitivities towards cisplatin fall in two distinct classes. The platinum-sensitive class is characterized by the expression of GATA6, miRNA-200a, and miRNA-200b, which might be developable as predictive biomarkers. In the case of resistant PDAC cells, we identified a synergism of cisplatin with HSP90 inhibitors. Mechanistic explanations of this synergy include the degradation of Fanconi anemia pathway factors upon HSP90 inhibition. Treatment with the drug combination resulted in increased DNA damage and chromosome fragmentation, as we have reported previously for ovarian cancer cells. On top of this, HSP90 inhibition also enhanced the accumulation of DNA-bound platinum. We next investigated an orthotopic syngeneic animal model consisting of tumors arising from KPC cells (LSL-KrasG12D/+; LSL-Trp53R172H/+; Pdx-1-Cre, C57/BL6 genetic background). Here again, when treating established tumors, the combination of cisplatin with the HSP90 inhibitor onalespib was highly effective and almost completely prevented further tumor growth. We propose that the combination of platinum drugs and HSP90 inhibitors might be worth testing in the clinics for the treatment of cisplatin-resistant PDACs.
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Affiliation(s)
- Katharina M. Ewers
- Institute of Molecular Oncology, Göttingen Center of Molecular Biosciences (GZMB), University Medical Center Göttingen, Justus von Liebig Weg 11, 37077 Göttingen, Germany; (K.M.E.); (T.Q.); (A.M.)
- Clinical Research Unit 5002, KFO5002, University Medical Center Göttingen, 37075 Göttingen, Germany; (S.P.); (W.K.); (E.H.)
| | - Shilpa Patil
- Clinical Research Unit 5002, KFO5002, University Medical Center Göttingen, 37075 Göttingen, Germany; (S.P.); (W.K.); (E.H.)
- Department of Gastroenterology, Gastrointestinal Oncology and Endocrinology, University Medical Center Göttingen, 37075 Göttingen, Germany
| | - Waltraut Kopp
- Clinical Research Unit 5002, KFO5002, University Medical Center Göttingen, 37075 Göttingen, Germany; (S.P.); (W.K.); (E.H.)
- Department of Gastroenterology, Gastrointestinal Oncology and Endocrinology, University Medical Center Göttingen, 37075 Göttingen, Germany
| | - Jürgen Thomale
- Institute of Cell Biology (Cancer Research), University of Duisburg-Essen Medical School, 45141 Essen, Germany;
| | - Tabea Quilitz
- Institute of Molecular Oncology, Göttingen Center of Molecular Biosciences (GZMB), University Medical Center Göttingen, Justus von Liebig Weg 11, 37077 Göttingen, Germany; (K.M.E.); (T.Q.); (A.M.)
- Clinical Research Unit 5002, KFO5002, University Medical Center Göttingen, 37075 Göttingen, Germany; (S.P.); (W.K.); (E.H.)
| | - Anna Magerhans
- Institute of Molecular Oncology, Göttingen Center of Molecular Biosciences (GZMB), University Medical Center Göttingen, Justus von Liebig Weg 11, 37077 Göttingen, Germany; (K.M.E.); (T.Q.); (A.M.)
- Clinical Research Unit 5002, KFO5002, University Medical Center Göttingen, 37075 Göttingen, Germany; (S.P.); (W.K.); (E.H.)
| | - Xin Wang
- Guangdong Provincial People’s Hospital, Guangdong Academy of Medical Sciences, Guangzhou 510080, China;
| | - Elisabeth Hessmann
- Clinical Research Unit 5002, KFO5002, University Medical Center Göttingen, 37075 Göttingen, Germany; (S.P.); (W.K.); (E.H.)
- Department of Gastroenterology, Gastrointestinal Oncology and Endocrinology, University Medical Center Göttingen, 37075 Göttingen, Germany
| | - Matthias Dobbelstein
- Institute of Molecular Oncology, Göttingen Center of Molecular Biosciences (GZMB), University Medical Center Göttingen, Justus von Liebig Weg 11, 37077 Göttingen, Germany; (K.M.E.); (T.Q.); (A.M.)
- Clinical Research Unit 5002, KFO5002, University Medical Center Göttingen, 37075 Göttingen, Germany; (S.P.); (W.K.); (E.H.)
- Correspondence:
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9
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Watabe S, Kobayashi S, Hatori M, Nishijima Y, Inoue N, Ikota H, Iwase A, Yokoo H, Saio M. Role of Lamin A and emerin in maintaining nuclear morphology in different subtypes of ovarian epithelial cancer. Oncol Lett 2021; 23:9. [PMID: 34820008 PMCID: PMC8607322 DOI: 10.3892/ol.2021.13127] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2021] [Accepted: 09/27/2021] [Indexed: 12/11/2022] Open
Abstract
The nuclear lamina protein, Lamin A and inner nuclear membrane protein, emerin participate in maintaining nuclear morphology. However, their correlations with the nuclear shape in the four representative ovarian epithelial cancer subtypes, high-grade serous carcinoma (HGSCa), clear cell carcinoma (CCCa), endometrioid carcinoma (EMCa) and mucinous carcinoma (MUCa), remains unclear. The present study aimed to investigate the association between nuclear morphology and nuclear membrane protein expression in four histological subtypes of ovarian epithelial cancer. A total of 140 surgically resected ovarian cancer specimens were subjected to Feulgen staining to evaluate nuclear morphology, and immunohistochemistry analysis to assess Lamin A and emerin expression. The histological images were analyzed via computer-assisted image analysis (CAIA). The results demonstrated that the mean nuclear area of EMCa was significantly smaller compared with CCCa (P=0.0009). The standard deviation of the mean nuclear area was used to assess nuclear size variation, and the results indicated that EMCa lesions were significantly smaller than CCCa lesions (P=0.0006). Regarding the correlation between the Lamin A-positive rate and nuclear morphological factors, positive correlations were observed with nuclear area in CCCa and EMCa (R=0.2855 and R=0.2858, respectively) and nuclear perimeter in CCCa, EMCa and MUCa (R=0.2409, R=0.4054 and R=0.2370, respectively); however, a negative correlation with nuclear shape factor was observed in HGSCa and EMCa (R=-0.2079 and R=-0.3707, respectively). With regards to the correlation between emerin positivity and nuclear morphological factors, positive correlations were observed with nuclear shape factor in HGSCa (R=0.2673) and nuclear area in CCCa (R=0.3310). It is well-known that HGSCa and CCCa have conspicuous nuclear size variation, and EMCa has small nuclei without strong atypia. These findings were verified in the present study via CAIA. Taken together, the results of the present study suggest that Lamin A strongly contributes to the maintenance of nuclear morphology in ovarian epithelial cancer compared with emerin, although their contributions differ based on tumor subtype.
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Affiliation(s)
- Shiori Watabe
- Laboratory of Histopathology and Cytopathology, Department of Laboratory Sciences, Gunma University Graduate School of Health Sciences, Maebashi, Gunma 371-8514, Japan.,Department of Pathology, Teikyo University School of Medicine, Itabashi-ku, Tokyo 173-8605, Japan
| | - Sayaka Kobayashi
- Laboratory of Histopathology and Cytopathology, Department of Laboratory Sciences, Gunma University Graduate School of Health Sciences, Maebashi, Gunma 371-8514, Japan
| | - Mizuho Hatori
- Laboratory of Histopathology and Cytopathology, Department of Laboratory Sciences, Gunma University Graduate School of Health Sciences, Maebashi, Gunma 371-8514, Japan
| | - Yoshimi Nishijima
- Laboratory of Histopathology and Cytopathology, Department of Laboratory Sciences, Gunma University Graduate School of Health Sciences, Maebashi, Gunma 371-8514, Japan
| | - Naoki Inoue
- Department of Obstetrics and Gynecology, Gunma University Graduate School of Medicine, Maebashi, Gunma 371-8511, Japan
| | - Hayato Ikota
- Clinical Department of Pathology, Gunma University Hospital, Maebashi, Gunma 371-8511, Japan
| | - Akira Iwase
- Department of Obstetrics and Gynecology, Gunma University Graduate School of Medicine, Maebashi, Gunma 371-8511, Japan
| | - Hideaki Yokoo
- Department of Human Pathology, Gunma University Graduate School of Medicine, Maebashi, Gunma 371-8511, Japan
| | - Masanao Saio
- Laboratory of Histopathology and Cytopathology, Department of Laboratory Sciences, Gunma University Graduate School of Health Sciences, Maebashi, Gunma 371-8514, Japan
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10
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The Role of Emerin in Cancer Progression and Metastasis. Int J Mol Sci 2021; 22:ijms222011289. [PMID: 34681951 PMCID: PMC8537873 DOI: 10.3390/ijms222011289] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2021] [Revised: 10/14/2021] [Accepted: 10/15/2021] [Indexed: 12/27/2022] Open
Abstract
It is commonly recognized in the field that cancer cells exhibit changes in the size and shape of their nuclei. These features often serve as important biomarkers in the diagnosis and prognosis of cancer patients. Nuclear size can significantly impact cell migration due to its incredibly large size. Nuclear structural changes are predicted to regulate cancer cell migration. Nuclear abnormalities are common across a vast spectrum of cancer types, regardless of tissue source, mutational spectrum, and signaling dependencies. The pervasiveness of nuclear alterations suggests that changes in nuclear structure may be crucially linked to the transformation process. The factors driving these nuclear abnormalities, and the functional consequences, are not completely understood. Nuclear envelope proteins play an important role in regulating nuclear size and structure in cancer. Altered expression of nuclear lamina proteins, including emerin, is found in many cancers and this expression is correlated with better clinical outcomes. A model is emerging whereby emerin, as well as other nuclear lamina proteins, binding to the nucleoskeleton regulates the nuclear structure to impact metastasis. In this model, emerin and lamins play a central role in metastatic transformation, since decreased emerin expression during transformation causes the nuclear structural defects required for increased cell migration, intravasation, and extravasation. Herein, we discuss the cellular functions of nuclear lamina proteins, with a particular focus on emerin, and how these functions impact cancer progression and metastasis.
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11
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Nuclear Dynamics and Chromatin Structure: Implications for Pancreatic Cancer. Cells 2021; 10:cells10102624. [PMID: 34685604 PMCID: PMC8534098 DOI: 10.3390/cells10102624] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2021] [Revised: 09/20/2021] [Accepted: 09/27/2021] [Indexed: 12/14/2022] Open
Abstract
Changes in nuclear shape have been extensively associated with the dynamics and functionality of cancer cells. In most normal cells, nuclei have a regular ellipsoid shape and minimal variation in nuclear size; however, an irregular nuclear contour and abnormal nuclear size is often observed in cancer, including pancreatic cancer. Furthermore, alterations in nuclear morphology have become the 'gold standard' for tumor staging and grading. Beyond the utility of altered nuclear morphology as a diagnostic tool in cancer, the implications of altered nuclear structure for the biology and behavior of cancer cells are profound as changes in nuclear morphology could impact cellular responses to physical strain, adaptation during migration, chromatin organization, and gene expression. Here, we aim to highlight and discuss the factors that regulate nuclear dynamics and their implications for pancreatic cancer biology.
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12
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Pawar S, Kutay U. The Diverse Cellular Functions of Inner Nuclear Membrane Proteins. Cold Spring Harb Perspect Biol 2021; 13:a040477. [PMID: 33753404 PMCID: PMC8411953 DOI: 10.1101/cshperspect.a040477] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
The nuclear compartment is delimited by a specialized expanded sheet of the endoplasmic reticulum (ER) known as the nuclear envelope (NE). Compared to the outer nuclear membrane and the contiguous peripheral ER, the inner nuclear membrane (INM) houses a unique set of transmembrane proteins that serve a staggering range of functions. Many of these functions reflect the exceptional position of INM proteins at the membrane-chromatin interface. Recent research revealed that numerous INM proteins perform crucial roles in chromatin organization, regulation of gene expression, genome stability, and mediation of signaling pathways into the nucleus. Other INM proteins establish mechanical links between chromatin and the cytoskeleton, help NE remodeling, or contribute to the surveillance of NE integrity and homeostasis. As INM proteins continue to gain prominence, we review these advancements and give an overview on the functional versatility of the INM proteome.
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Affiliation(s)
- Sumit Pawar
- Institute of Biochemistry, Department of Biology, ETH Zurich, 8093 Zurich, Switzerland
| | - Ulrike Kutay
- Institute of Biochemistry, Department of Biology, ETH Zurich, 8093 Zurich, Switzerland
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13
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Liddane AG, McNamara CA, Campbell MC, Mercier I, Holaska JM. Defects in Emerin-Nucleoskeleton Binding Disrupt Nuclear Structure and Promote Breast Cancer Cell Motility and Metastasis. Mol Cancer Res 2021; 19:1196-1207. [PMID: 33771882 PMCID: PMC8254762 DOI: 10.1158/1541-7786.mcr-20-0413] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2020] [Revised: 10/27/2020] [Accepted: 03/19/2021] [Indexed: 01/17/2023]
Abstract
Nuclear envelope proteins play an important role in regulating nuclear size and structure in cancer. Altered expression of nuclear lamins are found in many cancers and its expression is correlated with better clinical outcomes. The nucleus is the largest organelle in the cell with a diameter between 10 and 20 μm. Nuclear size significantly impacts cell migration. Nuclear structural changes are predicted to impact cancer metastasis by regulating cancer cell migration. Here we show emerin regulates nuclear structure in invasive breast cancer cells to impact cancer metastasis. Invasive breast cancer cells had 40% to 50% less emerin than control cells, which resulted in decreased nuclear size. Overexpression of GFP-emerin in invasive breast cancer cells rescued nuclear size and inhibited migration through 3.0 and 8.0 μm pores. Mutational analysis showed emerin binding to nucleoskeletal proteins was important for its regulation of nuclear structure, migration, and invasion. Importantly, emerin expression inhibited lung metastasis by 91% in orthotopic mouse models of breast cancer. Emerin nucleoskeleton-binding mutants failed to inhibit metastasis. These results support a model whereby emerin binding to the nucleoskeleton regulates nuclear structure to impact metastasis. In this model, emerin plays a central role in metastatic transformation, because decreased emerin expression during transformation causes the nuclear structural defects required for increased cell migration, intravasation, and extravasation. IMPLICATIONS: Modulating emerin expression and function represents new targets for therapeutic interventions of metastasis, because increased emerin expression rescued cancer metastasis.
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Affiliation(s)
- Alexandra G Liddane
- Department of Pharmaceutical Sciences, University of the Sciences, Philadelphia, Pennsylvania
- Department of Biomedical Sciences, Cooper Medical School of Rowan University, Camden, New Jersey
| | - Chelsea A McNamara
- Department of Biomedical Sciences, Cooper Medical School of Rowan University, Camden, New Jersey
| | - Mallory C Campbell
- Department of Pharmaceutical Sciences, University of the Sciences, Philadelphia, Pennsylvania
| | - Isabelle Mercier
- Department of Pharmaceutical Sciences, University of the Sciences, Philadelphia, Pennsylvania
| | - James M Holaska
- Department of Pharmaceutical Sciences, University of the Sciences, Philadelphia, Pennsylvania.
- Department of Biomedical Sciences, Cooper Medical School of Rowan University, Camden, New Jersey
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14
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Xu CL, Guan WQ, Wang XY. The expression of the GATA6 gene in oral carcinoma cell lines. World J Surg Oncol 2021; 19:153. [PMID: 34006300 PMCID: PMC8132435 DOI: 10.1186/s12957-021-02245-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2021] [Accepted: 04/14/2021] [Indexed: 01/07/2023] Open
Abstract
Background This study aimed to investigate the expression level of the GATA6 gene in different oral cancer cells. Methods In this study, we sub-cultured normal oral epithelial cell lines HOK, human tongue squamous cell carcinoma cell lines CAL-27 and SCC-4, and human salivary gland adenoid cystic carcinoma cell lines SACC-LM and SACC-83. Subsequently, we used reverse transcription-polymerase chain reaction RT-PCR and Western blot methods to detect the mRNA and the protein expressions of GATA6 in normal oral epithelial cells, human tongue squamous cell carcinoma cells, and human salivary gland adenoid cystic carcinoma cells. Results The results of this study showed that the mRNA expression levels of GATA6 in CAL-27, SCC-4, and SACC-LM cells were significantly increased when compared with the HOK cells. However, the mRNA expression level of GATA6 in the SACC-83 cells had no significant difference compared with the HOK cells. The protein expression levels of GATA6 in the SCC-4 and SACC-LM cells were, however, significantly increased whereas the protein expression levels of GATA6 in the CAL-27 and SACC-83 cells had no significant difference when compared with the HOK cells. Conclusion The GATA6 gene may be related to the occurrence and progression of certain oral cancers.
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Affiliation(s)
- Cheng-Lin Xu
- Department of Stomatology, Affiliated Hospital of Putian University, Putian, 351100, China
| | - Wei-Qun Guan
- Department of Stomatology, Union Hospital, Fujian Medical University, No. 29 of Xinquan Street, Gulou District, Fuzhou, 350001, China.
| | - Xue-Ying Wang
- Department of Stomatology, Union Hospital, Fujian Medical University, No. 29 of Xinquan Street, Gulou District, Fuzhou, 350001, China
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15
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Depletion of aneuploid cells in human embryos and gastruloids. Nat Cell Biol 2021; 23:314-321. [PMID: 33837289 DOI: 10.1038/s41556-021-00660-7] [Citation(s) in RCA: 86] [Impact Index Per Article: 28.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2020] [Accepted: 03/04/2021] [Indexed: 02/01/2023]
Abstract
Chromosomal instability leading to aneuploidy is pervasive in early human embryos1-3 and is considered as a major cause of infertility and pregnancy wastage4,5. Here we provide several lines of evidence that blastocysts containing aneuploid cells are worthy of in vitro fertilization transfer. First, we show clinically that aneuploid embryos can lead to healthy births, suggesting the presence of an in vivo mechanism to eliminate aneuploidy. Second, early development and cell specification modelled in micropatterned human 'gastruloids' grown in confined geometry show that aneuploid cells are depleted from embryonic germ layers, but not from extraembryonic tissue, by apoptosis in a bone morphogenetic protein 4 (BMP4)-dependent manner. Third, a small percentage of euploid cells rescues embryonic tissue in mosaic gastruloids when mixed with aneuploid cells. Finally, single-cell RNA-sequencing analysis of early human embryos revealed a decline of aneuploidy beginning on day 3. Our findings challenge two current dogmas: that a single trophectoderm biopsy at blastocyst stage to perform prenatal genetic testing can accurately determine the chromosomal make-up of a human embryo, and that aneuploid embryos should be withheld from embryo transfer in association with in vitro fertilization.
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16
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Emerging roles of lamins and DNA damage repair mechanisms in ovarian cancer. Biochem Soc Trans 2020; 48:2317-2333. [DOI: 10.1042/bst20200713] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2020] [Revised: 09/14/2020] [Accepted: 09/21/2020] [Indexed: 02/06/2023]
Abstract
Lamins are type V intermediate filament proteins which are ubiquitously present in all metazoan cells providing a platform for binding of chromatin and related proteins, thereby serving a wide range of nuclear functions including DNA damage repair. Altered expression of lamins in different subtypes of cancer is evident from researches worldwide. But whether cancer is a consequence of this change or this change is a consequence of cancer is a matter of future investigation. However changes in the expression levels of lamins is reported to have direct or indirect association with cancer progression or have regulatory roles in common neoplastic symptoms like higher nuclear deformability, increased genomic instability and reduced susceptibility to DNA damaging agents. It has already been proved that loss of A type lamin positively regulates cathepsin L, eventually leading to degradation of several DNA damage repair proteins, hence impairing DNA damage repair pathways and increasing genomic instability. It is established in ovarian cancer, that the extent of alteration in nuclear morphology can determine the degree of genetic changes and thus can be utilized to detect low to high form of serous carcinoma. In this review, we have focused on ovarian cancer which is largely caused by genomic alterations in the DNA damage response pathways utilizing proteins like RAD51, BRCA1, 53BP1 which are regulated by lamins. We have elucidated the current understanding of lamin expression in ovarian cancer and its implications in the regulation of DNA damage response pathways that ultimately result in telomere deformation and genomic instability.
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17
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Wang C, Liu Q, Huang M, Zhou Q, Zhang X, Zhang J, Xie R, Yu Y, Chen S, Fan J, Chen X. Loss of GATA6 expression promotes lymphatic metastasis in bladder cancer. FASEB J 2020; 34:5754-5766. [PMID: 32103545 DOI: 10.1096/fj.201903176r] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2019] [Revised: 02/06/2020] [Accepted: 02/18/2020] [Indexed: 12/19/2022]
Abstract
Lymph node metastasis is associated with tumor relapse and poor patient prognosis in bladder cancer. However, the mechanisms by which bladder carcinoma cells induce lymphangiogenesis and further promote metastasis in the lymphatic system remain unclear. Here, we show that the transcription factor GATA-binding factor 6 (GATA6) was substantially downregulated in bladder cancer via promoter hypermethylation. Low-level GATA6 expression significantly correlated with lymph node metastasis positivity and was able to predict earlier relapse and shorter survival of bladder cancer. Reconstitution of GATA6 inhibited lymphangiogenesis and lymph node metastasis in GATA6-low bladder cancer cells, while silencing of GATA6 rendered lymphatic metastasis in GATA6-high bladder cancer cells. Additionally, we demonstrated that GATA6 bound to the promoter of vascular endothelial growth factor (VEGF)-C, a lymphangiogenic factor, and acted as a transcriptional repressor. This GATA6/VEGF-C axis was essential for GATA6-mediated lymphatic metastasis. In bladder cancer patients, low GATA6 correlated with high VEGF-C and reduced overall survival. These findings indicate GATA6 as a pivotal regulator in the lymphatic dissemination of bladder cancer and suggest a new therapeutic target for the disease.
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Affiliation(s)
- Chanjuan Wang
- Department of Pathology, School of Basic Medical Sciences, Southern Medical University, Guangzhou, China
| | - Qinghua Liu
- Department of Experimental Research, Sun Yat-sen University Cancer Center, Guangzhou, China
| | - Ming Huang
- Department of Urology, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, Guangzhou, China
| | - Qianghua Zhou
- Department of Urology, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, Guangzhou, China
| | - Xiaoyu Zhang
- Department of Pathology, School of Basic Medical Sciences, Southern Medical University, Guangzhou, China
| | - Jingtong Zhang
- Department of Urology, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, Guangzhou, China
| | - Ruihui Xie
- Department of Urology, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, Guangzhou, China
| | - Yanqi Yu
- Department of Pathology, School of Basic Medical Sciences, Southern Medical University, Guangzhou, China
| | - Shang Chen
- Department of Pathology, School of Basic Medical Sciences, Southern Medical University, Guangzhou, China
| | - Jianbing Fan
- Department of Pathology, School of Basic Medical Sciences, Southern Medical University, Guangzhou, China
| | - Xu Chen
- Department of Urology, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, Guangzhou, China.,Guangdong Provincial Key Laboratory of Malignant Tumor Epigenetics and Gene Regulation, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, Guangzhou, China
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18
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Sur-Erdem I, Hussain MS, Asif M, Pınarbası N, Aksu AC, Noegel AA. Nesprin-1 impact on tumorigenic cell phenotypes. Mol Biol Rep 2019; 47:921-934. [PMID: 31741263 DOI: 10.1007/s11033-019-05184-w] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2019] [Accepted: 11/07/2019] [Indexed: 12/24/2022]
Abstract
The largest protein of the nuclear envelope (NE) is Nesprin-1 which forms a network along the NE interacting with actin, Emerin, Lamin, and SUN proteins. Mutations in the SYNE1 gene and reduction in Nesprin-1 protein levels have been reported to correlate with several age related diseases and cancer. In the present study, we tested whether Nesprin-1 overexpression can reverse the malignant phenotype of Huh7 cells, a human liver cancer cell line, which carries a mutation in the SYNE1 gene resulting in reduced Nesprin-1 protein levels, has altered nuclear shape, altered amounts and localization of NE components, centrosome localization and genome stability. Ectopic expression of a mini-Nesprin-1 led to an improvement of the nuclear shape, corrected the mislocalization of NE proteins, the centrosome positioning, and the alterations in the DNA damage response network. Additionally, Nesprin-1 had a profound effect on cellular senescence. These findings suggest that Nesprin-1 may be effective in tumorigenic cell phenotype correction of human liver cancer.
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Affiliation(s)
- Ilknur Sur-Erdem
- Institute of Biochemistry I, Medical Faculty, University Hospital Cologne, Cologne, Germany. .,Center for Molecular Medicine Cologne (CMMC) and Cologne Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases (CECAD), University of Cologne, Cologne, Germany. .,Koç University School of Medicine, 34450, Istanbul, Turkey. .,Koç University Research Center for Translational Medicine (KUTTAM), Istanbul, Turkey.
| | - Muhammed Sajid Hussain
- Institute of Biochemistry I, Medical Faculty, University Hospital Cologne, Cologne, Germany.,Center for Molecular Medicine Cologne (CMMC) and Cologne Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases (CECAD), University of Cologne, Cologne, Germany.,Cologne Center for Genomics (CCG), University of Cologne, Cologne, Germany
| | - Maria Asif
- Institute of Biochemistry I, Medical Faculty, University Hospital Cologne, Cologne, Germany.,Center for Molecular Medicine Cologne (CMMC) and Cologne Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases (CECAD), University of Cologne, Cologne, Germany.,Cologne Center for Genomics (CCG), University of Cologne, Cologne, Germany
| | - Nareg Pınarbası
- Koç University School of Medicine, 34450, Istanbul, Turkey.,Koç University Research Center for Translational Medicine (KUTTAM), Istanbul, Turkey
| | - Ali Cenk Aksu
- Koç University School of Medicine, 34450, Istanbul, Turkey.,Koç University Research Center for Translational Medicine (KUTTAM), Istanbul, Turkey
| | - Angelika A Noegel
- Institute of Biochemistry I, Medical Faculty, University Hospital Cologne, Cologne, Germany.,Center for Molecular Medicine Cologne (CMMC) and Cologne Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases (CECAD), University of Cologne, Cologne, Germany
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19
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Xu L, Deng S, Xiong H, Shi W, Luo S, Chen L. GATA-6 transcriptionally inhibits Shh to repress cell proliferation and migration in lung squamous cell carcinoma. Int J Biochem Cell Biol 2019; 115:105591. [PMID: 31442607 DOI: 10.1016/j.biocel.2019.105591] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2019] [Revised: 07/19/2019] [Accepted: 08/19/2019] [Indexed: 01/20/2023]
Abstract
GATA-6 is a transcription factor that participates in cell lineage differentiation and organogenesis in many tissue types. The abnormal expression of GATA-6 is associated with the development of diverse cancers. GATA-6 acts as an oncogene or tumor suppressor based on tumor origin. Here, we investigated the effects of GATA-6 on lung squamous cell carcinoma (LSCC). We found that GATA-6 was significantly reduced in LSCC tissues compared with the paired normal tissues. The overexpression of GATA-6 inhibited LSCC cell proliferation and migration. Importantly, a luciferase reporter assay and chromatin immunoprecipitation assay demonstrated that GATA-6 negatively regulated the expression of sonic hedgehog (Shh) by directly binding to its promoter region. Furthermore, N-Shh stimulation rescued the inhibition of LSCC cell proliferation and migration upon GATA-6 overexpression. Thus, GATA-6 inhibited the proliferation and migration of LSCC cells by transcriptionally inhibiting the expression of Shh, indicating that targeting GATA-6 may be a potential approach for LSCC therapy.
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Affiliation(s)
- Linlin Xu
- Center for Experimental Medicine, The First Affiliated Hospital of Nanchang University, Nanchang, Jiangxi 330006, China; Jiangxi Key Laboratory of Molecular Diagnostics and Precision Medicine, Nanchang, Jiangxi 330006, China
| | - Suyue Deng
- Center for Experimental Medicine, The First Affiliated Hospital of Nanchang University, Nanchang, Jiangxi 330006, China; Jiangxi Key Laboratory of Molecular Diagnostics and Precision Medicine, Nanchang, Jiangxi 330006, China
| | - Huanting Xiong
- Center for Experimental Medicine, The First Affiliated Hospital of Nanchang University, Nanchang, Jiangxi 330006, China; School of Pharmacy, Nanchang University, Nanchang, Jiangxi 330006, China; Jiangxi Key Laboratory of Molecular Diagnostics and Precision Medicine, Nanchang, Jiangxi 330006, China
| | - Wei Shi
- Center for Experimental Medicine, The First Affiliated Hospital of Nanchang University, Nanchang, Jiangxi 330006, China; School of Pharmacy, Nanchang University, Nanchang, Jiangxi 330006, China; Jiangxi Key Laboratory of Molecular Diagnostics and Precision Medicine, Nanchang, Jiangxi 330006, China
| | - Shiwen Luo
- Center for Experimental Medicine, The First Affiliated Hospital of Nanchang University, Nanchang, Jiangxi 330006, China; Jiangxi Key Laboratory of Molecular Diagnostics and Precision Medicine, Nanchang, Jiangxi 330006, China
| | - Limin Chen
- Center for Experimental Medicine, The First Affiliated Hospital of Nanchang University, Nanchang, Jiangxi 330006, China; Jiangxi Key Laboratory of Molecular Diagnostics and Precision Medicine, Nanchang, Jiangxi 330006, China.
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20
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Constitutional abnormality of nuclear membrane proteins in small cell lung carcinoma. Virchows Arch 2019; 475:407-414. [PMID: 31201505 DOI: 10.1007/s00428-019-02597-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2019] [Revised: 05/06/2019] [Accepted: 06/03/2019] [Indexed: 10/26/2022]
Abstract
Nuclear membrane proteins reportedly play important roles in maintaining nuclear structures and coordinating cell activities. Studying profiles of nuclear membrane proteins may help us evaluate the biological and/or clinical nature of malignant tumors. Using immunohistochemistry with antibodies for emerin, lamin A/C, lamin B, and LAP2, we examined 105 lung cancer tissues from 33 small cell lung carcinomas (SCLCs) and 72 non-SCLCs (34 adenocarcinomas, 30 squamous cell carcinomas, and 8 large cell carcinomas). Emerin had negative or local/weak positivity in 79% of SCLCs and 1% of non-SCLCs, and lamin A/C had similar positivity in 91% of SCLCs and 3% of non-SCLCs. LAP2's expression was similar between SCLCs and non-SCLCs. RT-PCR analyses for these four nuclear membrane proteins over 7 cell lines showed that mRNA of emerin and lamin A/C were distinctly downregulated in the SCLC cell lines, supporting the immunohistochemical results. In conclusion, we suggest that downregulation of the nuclear membrane proteins emerin and lamin A/C is characteristic of SCLC cells, and this constitutional abnormality of the nuclear membrane may be related to the biological and/or clinical nature of SCLC. In addition, knowing the nuclear protein profile in SCLC cells may contribute to our understanding of nuclear fragility known as the crush artifact in pulmonary biopsy specimens.
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21
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Ahn JH, Cho MG, Sohn S, Lee JH. Inhibition of PP2A activity by H 2O 2 during mitosis disrupts nuclear envelope reassembly and alters nuclear shape. Exp Mol Med 2019; 51:1-18. [PMID: 31164634 PMCID: PMC6548778 DOI: 10.1038/s12276-019-0260-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2018] [Revised: 11/02/2018] [Accepted: 11/14/2018] [Indexed: 01/01/2023] Open
Abstract
Many types of cancer cells exhibit abnormal nuclear shapes induced by various molecular changes. However, whether reactive oxygen species (ROS) induce nuclear deformation has not been fully addressed. Here, we show that hydrogen peroxide (H2O2) treatment induced concentration-dependent alterations in nuclear shape that were abolished by pretreatment with the antioxidant N-acetyl-L-cysteine or by catalase overexpression. Interestingly, treatment with H2O2 induced nuclear shape alterations significantly more frequently in mitotic cells than in asynchronous cells, suggesting that H2O2 mainly affects nuclear envelope disassembly and/or reassembly processes. Because protein phosphatase 2 A (PP2A) activity is reported to be involved in nuclear envelope reassembly during mitosis, we investigated the possible involvement of PP2A. Indeed, H2O2 reduced the activity of PP2A, an effect that was mimicked by the PP1 and PP2A inhibitor okadaic acid. Moreover, overexpression of PP2A but not PP1 or PP4 partially rescued H2O2-induced alterations in nuclear shape, indicating that the decrease in PP2A activity induced by H2O2 is specifically involved in the observed nuclear shape alterations. We further show that treatment of mitotic cells with H2O2 induced the mislocalization of BAF (barrier-to-autointegration factor), a substrate of PP2A, during telophase. This effect was associated with Lamin A/C mislocalization and was rescued by PP2A overexpression. Collectively, our findings suggest that H2O2 preferentially affects mitotic cells through PP2A inhibition, which induces the subsequent mislocalization of BAF and Lamin A/C during nuclear envelope reassembly, leading to the formation of an abnormal nuclear shape. A class of harmful chemical compounds produces morphological abnormalities in the nucleus that may help promote tumor growth. Reactive oxygen species (ROS) are DNA- and protein-damaging molecules that originate both from environmental contaminants and as a byproduct of cellular metabolism or stress. Jae-Ho Lee and colleagues at Ajou University, Suwon, South Korea have now identified a mechanism by which ROS can disrupt the shape and structure of the nucleus. They show that ROS exposure reduces the ativity of an enzyme called PP2A, which is required for the targeted recruitment of proteins that rebuild the membrane envelope surrounding the nucleus after cell division. Perturbations in this envelope can potentially contribute to damage to the chromosomal DNA within the nucleus, creating conditions that can trigger or accelerate the process of tumorigenesis.
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Affiliation(s)
- Ju-Hyun Ahn
- Department of Biochemistry and Molecular Biology, Ajou University School of Medicine, Suwon, 443-721, South Korea.,Genomic Instability Research Center, Ajou University School of Medicine, Suwon, 443-721, South Korea.,Department of Biomedical Sciences, The Graduate School of Ajou University, Suwon, 443-721, South Korea
| | - Min-Guk Cho
- Department of Biochemistry and Molecular Biology, Ajou University School of Medicine, Suwon, 443-721, South Korea.,Genomic Instability Research Center, Ajou University School of Medicine, Suwon, 443-721, South Korea.,Department of Biomedical Sciences, The Graduate School of Ajou University, Suwon, 443-721, South Korea
| | - Seonghyang Sohn
- Department of Biomedical Sciences, The Graduate School of Ajou University, Suwon, 443-721, South Korea.,Department of Microbiology, Ajou University School of Medicine, Suwon, 443-721, South Korea
| | - Jae-Ho Lee
- Department of Biochemistry and Molecular Biology, Ajou University School of Medicine, Suwon, 443-721, South Korea. .,Genomic Instability Research Center, Ajou University School of Medicine, Suwon, 443-721, South Korea. .,Department of Biomedical Sciences, The Graduate School of Ajou University, Suwon, 443-721, South Korea.
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22
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Tan HW, Leung CON, Chan KKS, Ho DWH, Leung MS, Wong CM, Ng IOL, Lo RCL. Deregulated GATA6 modulates stem cell-like properties and metabolic phenotype in hepatocellular carcinoma. Int J Cancer 2019; 145:1860-1873. [PMID: 30834518 DOI: 10.1002/ijc.32248] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2018] [Revised: 02/10/2019] [Accepted: 02/27/2019] [Indexed: 12/11/2022]
Abstract
Accumulating evidence illustrates the significance of cell plasticity in the molecular biology of liver cancer. Reprogramming of mature parenchymal cells to a less differentiated state by key molecular targets contributes to the pathogenesis of hepatocellular carcinoma (HCC). Hereby, we investigated the role of GATA6, a transcription factor implicated in hepatocyte lineage specification, in HCC. Our results demonstrated a lower expression of GATA6 in HCC tissues compared to the corresponding nontumoral liver tissues. Moreover, GATA6 underexpression, as observed in about 50% cases in our clinical cohort, was associated with a poorer degree of tumor cell differentiation and worse disease-free survival outcome. In vitro, silencing of GATA6 in HCC cells augmented cell migration and invasion abilities of HCC cells by activating epithelial-mesenchymal transition. Self-renewal was also enhanced in vitro. Consistently, in vivo tumorigenicity and self-renewal was promoted upon GATA6 knockdown. Notably, suppression of GATA6 converts HCC cells to a metabolic phenotype recapitulating stem-cell state. Expression of glycolytic markers was elevated in GATA6-knockdown clones accompanied by increased glucose uptake; while overexpression of GATA6 resulted in opposite effects. Further to this, we identified that GATA6 bound to the promoter region of PKM gene and regulated PKM2 transcription. Taken together, downregulation of GATA6 directs HCC cells to glycolytic metabolism and fosters tumorigenicity, self-renewal and metastasis. GATA6 is a transcriptional regulator and a genetic switch that converts the phenotypic reprogramming of HCC cells. It is a potential prognostic biomarker and therapeutic target for liver cancer.
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Affiliation(s)
- Han-Wei Tan
- Department of Pathology, The University of Hong Kong, Pokfulam, Hong Kong
| | - Carmen Oi-Ning Leung
- Department of Pathology, The University of Hong Kong, Pokfulam, Hong Kong.,Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hung Hom, Hong Kong
| | | | - Daniel Wai-Hung Ho
- Department of Pathology, The University of Hong Kong, Pokfulam, Hong Kong
| | - Ming-Sum Leung
- Department of Pathology, The University of Hong Kong, Pokfulam, Hong Kong
| | - Chun-Ming Wong
- Department of Pathology, The University of Hong Kong, Pokfulam, Hong Kong.,State Key Laboratory of Liver Research, The University of Hong Kong, Pokfulam, Hong Kong
| | - Irene Oi-Lin Ng
- Department of Pathology, The University of Hong Kong, Pokfulam, Hong Kong.,State Key Laboratory of Liver Research, The University of Hong Kong, Pokfulam, Hong Kong
| | - Regina Cheuk-Lam Lo
- Department of Pathology, The University of Hong Kong, Pokfulam, Hong Kong.,State Key Laboratory of Liver Research, The University of Hong Kong, Pokfulam, Hong Kong
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23
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Detecting Chromosome Instability in Cancer: Approaches to Resolve Cell-to-Cell Heterogeneity. Cancers (Basel) 2019; 11:cancers11020226. [PMID: 30781398 PMCID: PMC6406658 DOI: 10.3390/cancers11020226] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2019] [Revised: 02/11/2019] [Accepted: 02/13/2019] [Indexed: 02/07/2023] Open
Abstract
Chromosome instability (CIN) is defined as an increased rate of chromosome gains and losses that manifests as cell-to-cell karyotypic heterogeneity and drives cancer initiation and evolution. Current research efforts are aimed at identifying the etiological origins of CIN, establishing its roles in cancer pathogenesis, understanding its implications for patient prognosis, and developing novel therapeutics that are capable of exploiting CIN. Thus, the ability to accurately identify and evaluate CIN is critical within both research and clinical settings. Here, we provide an overview of quantitative single cell approaches that evaluate and resolve cell-to-cell heterogeneity and CIN, and discuss considerations when selecting the most appropriate approach to suit both research and clinical contexts.
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24
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Izawa M, Taniguchi F, Harada T. GATA6 expression promoted by an active enhancer may become a molecular marker in endometriosis lesions. Am J Reprod Immunol 2019; 81:e13078. [PMID: 30589192 DOI: 10.1111/aji.13078] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2018] [Revised: 11/12/2018] [Accepted: 12/12/2018] [Indexed: 01/03/2023] Open
Abstract
PROBLEM Genome-wide profiling of DNA methylation in endometriotic cells has shown a distinct facet of epigenetic backgrounds; however, specific DNA methylation sites responsible for aberrant gene expression in endometriosis were unknown. Are there specific endometriosis-associated DNA methylations that can be used as molecular markers in endometriosis lesions? METHOD OF STUDY This study used endometriotic tissues from the chocolate cyst lining of the ovaries of patients with endometriosis, and endometrial tissues from disease-free patients. For analysis, stromal cells were collected from endometrial and endometriotic tissues. Using endometrial cells as control, differentially methylated cytosine-phosphate-guanine (CpG) characteristic in endometriotic cells was extracted. Among these CpGs, we focused on a stretch of hypomethylated CpGs within GATA6 gene and examined the potential role as enhancer in endometriotic cells and tissues. RESULT(S) We identified a stretch of hypomethylated CpGs within the GATA6 gene body in endometriotic cells. Because GATA6 mRNA was highly expressed in endometriotic cells but not in endometrial cells, we then hypothesized that the hypomethylated sequence may function as an enhancer in GATA6 gene expression. Chromatin immunoprecipitation analysis predicted the presence of active enhancer within the gene body sequence in endometriotic cells. Immunohistochemistry showed a positive staining of GATA6 in ovarian chocolate cysts, while in endometrial tissues and in some peritoneal tissues with endometriosis, GATA6 staining was at a marginal level. CONCLUSION This is the first implication showing a link between an aberrant DNA methylation of cis element and gene expression in endometriosis. GATA6 expression may become a molecular marker to diagnose endometriosis lesions.
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Affiliation(s)
- Masao Izawa
- Department of Obstetrics and Gynecology, Tottori University Faculty of Medicine, Yonago, Japan
| | - Fuminori Taniguchi
- Department of Obstetrics and Gynecology, Tottori University Faculty of Medicine, Yonago, Japan
| | - Tasuku Harada
- Department of Obstetrics and Gynecology, Tottori University Faculty of Medicine, Yonago, Japan
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25
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Smith ER, Capo-Chichi CD, Xu XX. Defective Nuclear Lamina in Aneuploidy and Carcinogenesis. Front Oncol 2018; 8:529. [PMID: 30524960 PMCID: PMC6256246 DOI: 10.3389/fonc.2018.00529] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2018] [Accepted: 10/29/2018] [Indexed: 01/05/2023] Open
Abstract
Aneuploidy, loss or gain of whole chromosomes, is a prominent feature of carcinomas, and is generally considered to play an important role in the initiation and progression of cancer. In high-grade serous ovarian cancer, the only common gene aberration is the p53 point mutation, though extensive genomic perturbation is common due to severe aneuploidy, which presents as a deviant karyotype. Several mechanisms for the development of aneuploidy in cancer cells have been recognized, including chromosomal non-disjunction during mitosis, centrosome amplification, and more recently, nuclear envelope rupture at interphase. Many cancer types including ovarian cancer have lost or reduced expression of Lamin A/C, a structural component of the lamina matrix that underlies the nuclear envelope in differentiated cells. Several recent studies suggest that a nuclear lamina defect caused by the loss or reduction of Lamin A/C leads to failure in cytokinesis and formation of tetraploid cells, transient nuclear envelope rupture, and formation of nuclear protrusions and micronuclei during the cell cycle gap phase. Thus, loss and reduction of Lamin A/C underlies the two common features of cancer—aberrations in nuclear morphology and aneuploidy. We discuss here and emphasize the newly recognized mechanism of chromosomal instability due to the rupture of a defective nuclear lamina, which may account for the rapid genomic changes in carcinogenesis.
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Affiliation(s)
- Elizabeth R Smith
- Department of Cell Biology, Sylvester Comprehensive Cancer Center, University of Miami Miller School of Medicine, Miami, FL, United States
| | - Callinice D Capo-Chichi
- Department of Cell Biology, Sylvester Comprehensive Cancer Center, University of Miami Miller School of Medicine, Miami, FL, United States.,Laboratory of Biochemistry and Molecular Biology, Institute of Biomedical Sciences, University of Abomey-Calavi, Abomey Calavi, Benin
| | - Xiang-Xi Xu
- Department of Cell Biology, Sylvester Comprehensive Cancer Center, University of Miami Miller School of Medicine, Miami, FL, United States
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26
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Heindl A, Khan AM, Rodrigues DN, Eason K, Sadanandam A, Orbegoso C, Punta M, Sottoriva A, Lise S, Banerjee S, Yuan Y. Microenvironmental niche divergence shapes BRCA1-dysregulated ovarian cancer morphological plasticity. Nat Commun 2018. [PMID: 30254278 DOI: 10.1038/s41467-018-06130-3] [] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
How tumor microenvironmental forces shape plasticity of cancer cell morphology is poorly understood. Here, we conduct automated histology image and spatial statistical analyses in 514 high grade serous ovarian samples to define cancer morphological diversification within the spatial context of the microenvironment. Tumor spatial zones, where cancer cell nuclei diversify in shape, are mapped in each tumor. Integration of this spatially explicit analysis with omics and clinical data reveals a relationship between morphological diversification and the dysregulation of DNA repair, loss of nuclear integrity, and increased disease mortality. Within the Immunoreactive subtype, spatial analysis further reveals significantly lower lymphocytic infiltration within diversified zones compared with other tumor zones, suggesting that even immune-hot tumors contain cells capable of immune escape. Our findings support a model whereby a subpopulation of morphologically plastic cancer cells with dysregulated DNA repair promotes ovarian cancer progression through positive selection by immune evasion.
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Affiliation(s)
- Andreas Heindl
- Centre for Evolution and Cancer, The Institute of Cancer Research, London, SM2 5NG, UK.,Division of Molecular Pathology, The Institute of Cancer Research, London, SM2 5NG, UK
| | - Adnan Mujahid Khan
- Centre for Evolution and Cancer, The Institute of Cancer Research, London, SM2 5NG, UK.,Division of Molecular Pathology, The Institute of Cancer Research, London, SM2 5NG, UK
| | - Daniel Nava Rodrigues
- Division of Cancer Therapeutics, The Institute of Cancer Research, London, SM2 5NG, UK
| | - Katherine Eason
- Division of Molecular Pathology, The Institute of Cancer Research, London, SM2 5NG, UK
| | - Anguraj Sadanandam
- Division of Molecular Pathology, The Institute of Cancer Research, London, SM2 5NG, UK.,Centre for Molecular Pathology, Royal Marsden Hospital, London, SM2 5NG, UK
| | - Cecilia Orbegoso
- Gynaecology Unit, The Royal Marsden NHS Foundation Trust, London, SW3 6JJ, UK
| | - Marco Punta
- Centre for Evolution and Cancer, The Institute of Cancer Research, London, SM2 5NG, UK
| | - Andrea Sottoriva
- Centre for Evolution and Cancer, The Institute of Cancer Research, London, SM2 5NG, UK
| | - Stefano Lise
- Centre for Evolution and Cancer, The Institute of Cancer Research, London, SM2 5NG, UK
| | - Susana Banerjee
- Gynaecology Unit, The Royal Marsden NHS Foundation Trust, London, SW3 6JJ, UK.,Division of Clinical Studies, the Institute of Cancer Research, London, UK, SM2 5NG
| | - Yinyin Yuan
- Centre for Evolution and Cancer, The Institute of Cancer Research, London, SM2 5NG, UK. .,Division of Molecular Pathology, The Institute of Cancer Research, London, SM2 5NG, UK.
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27
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Heindl A, Khan AM, Rodrigues DN, Eason K, Sadanandam A, Orbegoso C, Punta M, Sottoriva A, Lise S, Banerjee S, Yuan Y. Microenvironmental niche divergence shapes BRCA1-dysregulated ovarian cancer morphological plasticity. Nat Commun 2018; 9:3917. [PMID: 30254278 PMCID: PMC6156340 DOI: 10.1038/s41467-018-06130-3] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2017] [Accepted: 08/15/2018] [Indexed: 12/22/2022] Open
Abstract
How tumor microenvironmental forces shape plasticity of cancer cell morphology is poorly understood. Here, we conduct automated histology image and spatial statistical analyses in 514 high grade serous ovarian samples to define cancer morphological diversification within the spatial context of the microenvironment. Tumor spatial zones, where cancer cell nuclei diversify in shape, are mapped in each tumor. Integration of this spatially explicit analysis with omics and clinical data reveals a relationship between morphological diversification and the dysregulation of DNA repair, loss of nuclear integrity, and increased disease mortality. Within the Immunoreactive subtype, spatial analysis further reveals significantly lower lymphocytic infiltration within diversified zones compared with other tumor zones, suggesting that even immune-hot tumors contain cells capable of immune escape. Our findings support a model whereby a subpopulation of morphologically plastic cancer cells with dysregulated DNA repair promotes ovarian cancer progression through positive selection by immune evasion.
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Affiliation(s)
- Andreas Heindl
- Centre for Evolution and Cancer, The Institute of Cancer Research, London, SM2 5NG, UK
- Division of Molecular Pathology, The Institute of Cancer Research, London, SM2 5NG, UK
| | - Adnan Mujahid Khan
- Centre for Evolution and Cancer, The Institute of Cancer Research, London, SM2 5NG, UK
- Division of Molecular Pathology, The Institute of Cancer Research, London, SM2 5NG, UK
| | - Daniel Nava Rodrigues
- Division of Cancer Therapeutics, The Institute of Cancer Research, London, SM2 5NG, UK
| | - Katherine Eason
- Division of Molecular Pathology, The Institute of Cancer Research, London, SM2 5NG, UK
| | - Anguraj Sadanandam
- Division of Molecular Pathology, The Institute of Cancer Research, London, SM2 5NG, UK
- Centre for Molecular Pathology, Royal Marsden Hospital, London, SM2 5NG, UK
| | - Cecilia Orbegoso
- Gynaecology Unit, The Royal Marsden NHS Foundation Trust, London, SW3 6JJ, UK
| | - Marco Punta
- Centre for Evolution and Cancer, The Institute of Cancer Research, London, SM2 5NG, UK
| | - Andrea Sottoriva
- Centre for Evolution and Cancer, The Institute of Cancer Research, London, SM2 5NG, UK
| | - Stefano Lise
- Centre for Evolution and Cancer, The Institute of Cancer Research, London, SM2 5NG, UK
| | - Susana Banerjee
- Gynaecology Unit, The Royal Marsden NHS Foundation Trust, London, SW3 6JJ, UK
- Division of Clinical Studies, the Institute of Cancer Research, London, UK, SM2 5NG
| | - Yinyin Yuan
- Centre for Evolution and Cancer, The Institute of Cancer Research, London, SM2 5NG, UK.
- Division of Molecular Pathology, The Institute of Cancer Research, London, SM2 5NG, UK.
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Microenvironmental niche divergence shapes BRCA1-dysregulated ovarian cancer morphological plasticity. Nat Commun 2018. [PMID: 30254278 DOI: 10.1038/s41467-018-06130-3]+[] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
How tumor microenvironmental forces shape plasticity of cancer cell morphology is poorly understood. Here, we conduct automated histology image and spatial statistical analyses in 514 high grade serous ovarian samples to define cancer morphological diversification within the spatial context of the microenvironment. Tumor spatial zones, where cancer cell nuclei diversify in shape, are mapped in each tumor. Integration of this spatially explicit analysis with omics and clinical data reveals a relationship between morphological diversification and the dysregulation of DNA repair, loss of nuclear integrity, and increased disease mortality. Within the Immunoreactive subtype, spatial analysis further reveals significantly lower lymphocytic infiltration within diversified zones compared with other tumor zones, suggesting that even immune-hot tumors contain cells capable of immune escape. Our findings support a model whereby a subpopulation of morphologically plastic cancer cells with dysregulated DNA repair promotes ovarian cancer progression through positive selection by immune evasion.
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29
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Smith ER, George SH, Kobetz E, Xu XX. New biological research and understanding of Papanicolaou's test. Diagn Cytopathol 2018; 46:507-515. [PMID: 29663734 PMCID: PMC5949091 DOI: 10.1002/dc.23941] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2018] [Revised: 03/08/2018] [Accepted: 03/28/2018] [Indexed: 02/06/2023]
Abstract
The development of the Papanicolaou smear test by Dr. George Nicholas Papanicolaou (1883-1962) is one of the most significant achievements in screening for disease and cancer prevention in history. The Papanicolaou smear has been used for screening of cervical cancer since the 1950s. The test is technically straightforward and practical and based on a simple scientific observation: malignant cells have an aberrant nuclear morphology that can be distinguished from benign cells. Here, we review the scientific understanding that has been achieved and continues to be made on the causes and consequences of abnormal nuclear morphology, the basis of Dr. Papanicolaou's invention. The deformed nuclear shape is caused by the loss of lamina and nuclear envelope structural proteins. The consequences of a nuclear envelope defect include chromosomal numerical instability, altered chromatin organization and gene expression, and increased cell mobility because of a malleable nuclear envelope. HPV (Human Papilloma Virus) infection is recognized as the key etiology in the development of cervical cancer. Persistent HPV infection causes disruption of the nuclear lamina, which presents as a change in nuclear morphology detectable by a Papanicolaou smear. Thus, the causes and consequences of nuclear deformation are now linked to the mechanisms of viral carcinogenesis, and are still undergoing active investigation to reveal the details. Recently a statue was installed in front of the Papanicolaou's Cancer Research Building to honor the inventor. Remarkably, the invention nearly 60 years ago by Dr. Papanicolaou still exerts clinical impacts and inspires scientific inquiries.
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Affiliation(s)
- Elizabeth R. Smith
- Department of Cell Biology, Sylvester Comprehensive Cancer Center, University of Miami Miller School of Medicine, Miami, FL 33136
| | - Sophia H. George
- Department of Obstetrics & Gynecology, Sylvester Comprehensive Cancer Center, University of Miami Miller School of Medicine, Miami, FL 33136
| | - Erin Kobetz
- Department of Medicine, Sylvester Comprehensive Cancer Center, University of Miami Miller School of Medicine, Miami, FL 33136
| | - Xiang-Xi Xu
- Department of Cell Biology, Sylvester Comprehensive Cancer Center, University of Miami Miller School of Medicine, Miami, FL 33136
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30
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Kim DH, Hah J, Wirtz D. Mechanics of the Cell Nucleus. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2018; 1092:41-55. [DOI: 10.1007/978-3-319-95294-9_3] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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31
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Aberrant GATA2 epigenetic dysregulation induces a GATA2/GATA6 switch in human gastric cancer. Oncogene 2017; 37:993-1004. [PMID: 29106391 DOI: 10.1038/onc.2017.397] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2017] [Revised: 08/08/2017] [Accepted: 09/15/2017] [Indexed: 02/07/2023]
Abstract
Six GATA transcription factors play important roles in eukaryotic development. Among these, GATA2, an essential factor for the hematopoietic cell lineage, exhibits low expression in human gastric tissues, whereas GATA6, which is crucial for gastrointestinal development and differentiation, is frequently amplified and/or overexpressed in human gastric cancer. Interestingly, we found that GATA6 was overexpressed in human gastric cancer cells only when GATA2 expression was completely absent, thereby showing an inverse correlation between GATA2 and GATA6. In gastric cancer cells that express high GATA6 levels, a GATA2 CpG island is hypermethylated, repressing expression in these cells. In contrast, GATA6 expression is undetectable in GATA2-overexpressing gastric cancer cells, which lack GATA2 DNA methylation. Furthermore, PRC2 complex-mediated transcriptional silencing of GATA6 was observed in the GATA2-overexpressing cells. We also show that the GATA2 and PRC2 complexes are enriched within the GATA6 locus, and that the recruitment of the PRC2 complex is impaired by disrupting GATA2 expression, resulting in GATA6 upregulation. In addition, ectopic GATA2 expression significantly downregulates GATA6 expression, suggesting GATA2 directly represses GATA6. Furthermore, GATA6 downregulation showed antitumor activity by inducing growth arrest. Finally, we show that aberrant GATA2 methylation occurs early during the multistep process of gastric carcinogenesis regardless of Helicobacter pylori infection. Taken together, GATA2 dysregulation by epigenetic modification is associated with unfavorable phenotypes in human gastric cancer cells by allowing GATA6 expression.
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32
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Smith ER, Meng Y, Moore R, Tse JD, Xu AG, Xu XX. Nuclear envelope structural proteins facilitate nuclear shape changes accompanying embryonic differentiation and fidelity of gene expression. BMC Cell Biol 2017; 18:8. [PMID: 28088180 PMCID: PMC5237523 DOI: 10.1186/s12860-017-0125-0] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2016] [Accepted: 01/07/2017] [Indexed: 12/22/2022] Open
Abstract
BACKGROUND Nuclear size and shape are specific to a cell type, function, and location, and can serve as indicators of disease and development. We previously found that lamin A/C and associated nuclear envelope structural proteins were upregulated when murine embryonic stem (ES) cells differentiated to primitive endoderm cells. Here we further investigated the morphological changes of nuclei that accompany this differentiation. RESULTS The nuclei of undifferentiated wild type cells were found shaped as flattened, irregular ovals, whereas nuclei of Gata4-positive endoderm cells were more spherical, less flattened, and with a slightly reduced volume. The morphological change was confirmed in the trophectoderm and primitive endoderm lineages of E4.5 blastocysts, compared to larger and more irregularly shaped of the nuclei of the inner cell mass. We established ES cells genetically null for the nuclear lamina proteins lamin A/C or the inner nuclear envelope protein emerin, or compound mutant for both lamin A/C and emerin. ES cells deficient in lamin A/C differentiated to endoderm but less efficiently, and the nuclei remained flattened and failed to condense. The size and shape of emerin-deficient nuclei also remained uncondensed after treatment with RA. The emerin/lamin A/C double knockout ES cells failed to differentiate to endoderm cells, though the nuclei condensed but retained a generally flattened ellipsoid shape. Additionally, ES cells deficient for lamin A/C and/or emerin had compromised ability to undergo endoderm differentiation, where the differentiating cells often exhibited coexpression of pluripotent and differentiation markers, such as Oct3/4 and Gata4, respectively, indicating an infidelity of gene regulation. CONCLUSIONS The results suggest that changes in nuclear size and shape, which are mediated by nuclear envelope structural proteins lamin A/C and/or emerin, also impact gene regulation and lineage differentiation in early embryos. Nevertheless, mice lacking both lamin A/C and emerin were born at the expected frequency, indicating their embryonic development is completed despite the observed protein deficiency.
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Affiliation(s)
- Elizabeth R Smith
- Department of Cell Biology, Sylvester Comprehensive Cancer Center, University of Miami Miller School of Medicine, Papanicolaou Building, Room 415 [M877] 1550 NW 10th Avenue, Miami, FL, 33136, USA.
| | - Yue Meng
- Department of Cell Biology, Sylvester Comprehensive Cancer Center, University of Miami Miller School of Medicine, Papanicolaou Building, Room 415 [M877] 1550 NW 10th Avenue, Miami, FL, 33136, USA
| | - Robert Moore
- Department of Cell Biology, Sylvester Comprehensive Cancer Center, University of Miami Miller School of Medicine, Papanicolaou Building, Room 415 [M877] 1550 NW 10th Avenue, Miami, FL, 33136, USA
| | - Jeffrey D Tse
- Department of Cell Biology, Sylvester Comprehensive Cancer Center, University of Miami Miller School of Medicine, Papanicolaou Building, Room 415 [M877] 1550 NW 10th Avenue, Miami, FL, 33136, USA
| | - Arn G Xu
- Department of Cell Biology, Sylvester Comprehensive Cancer Center, University of Miami Miller School of Medicine, Papanicolaou Building, Room 415 [M877] 1550 NW 10th Avenue, Miami, FL, 33136, USA
| | - Xiang-Xi Xu
- Department of Cell Biology, Sylvester Comprehensive Cancer Center, University of Miami Miller School of Medicine, Papanicolaou Building, Room 415 [M877] 1550 NW 10th Avenue, Miami, FL, 33136, USA
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Capo-Chichi CD, Yeasky TM, Smith ER, Xu XX. Nuclear envelope structural defect underlies the main cause of aneuploidy in ovarian carcinogenesis. BMC Cell Biol 2016; 17:37. [PMID: 27875985 PMCID: PMC5120486 DOI: 10.1186/s12860-016-0114-8] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2016] [Accepted: 10/26/2016] [Indexed: 02/07/2023] Open
Abstract
BACKGROUND The Cancer Atlas project has shown that p53 is the only commonly (96 %) mutated gene found in high-grade serous epithelial ovarian cancer, the major histological subtype. Another general genetic change is extensive aneuploidy caused by chromosomal numerical instability, which is thought to promote malignant transformation. Conventionally, aneuploidy is thought to be the result of mitotic errors and chromosomal nondisjunction during mitosis. Previously, we found that ovarian cancer cells often lost or reduced nuclear lamina proteins lamin A/C, and suppression of lamin A/C in cultured ovarian epithelial cells leads to aneuploidy. Following up, we investigated the mechanisms of lamin A/C-suppression in promoting aneuploidy and synergy with p53 inactivation. RESULTS We found that suppression of lamin A/C by siRNA in human ovarian surface epithelial cells led to frequent nuclear protrusions and formation of micronuclei. Lamin A/C-suppressed cells also often underwent mitotic failure and furrow regression to form tetraploid cells, which frequently underwent aberrant multiple polar mitosis to form aneuploid cells. In ovarian surface epithelial cells isolated from p53 null mice, transient suppression of lamin A/C produced massive aneuploidy with complex karyotypes, and the cells formed malignant tumors when implanted in mice. CONCLUSIONS Based on the results, we conclude that a nuclear envelope structural defect, such as the loss or reduction of lamin A/C proteins, leads to aneuploidy by both the formation of tetraploid intermediates following mitotic failure, and the reduction of chromosome (s) following nuclear budding and subsequent loss of micronuclei. We suggest that the nuclear envelope defect, rather than chromosomal unequal distribution during cytokinesis, is the main cause of aneuploidy in ovarian cancer development.
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Affiliation(s)
- Callinice D Capo-Chichi
- Sylvester Comprehensive Cancer Center/University of Miami, Miami, Florida, 33136, USA.,Department of Cell Biology, University of Miami Miller School of Medicine, Miami, FL, 33136, USA.,Institute of Biomedical Sciences, Laboratory of Biochemistry and Molecular Biology, University of Abomey-Calavi, Abomey Calavi, Benin
| | - Toni M Yeasky
- Sylvester Comprehensive Cancer Center/University of Miami, Miami, Florida, 33136, USA.,Department of Cell Biology, University of Miami Miller School of Medicine, Miami, FL, 33136, USA
| | - Elizabeth R Smith
- Sylvester Comprehensive Cancer Center/University of Miami, Miami, Florida, 33136, USA.,Department of Cell Biology, University of Miami Miller School of Medicine, Miami, FL, 33136, USA
| | - Xiang-Xi Xu
- Sylvester Comprehensive Cancer Center/University of Miami, Miami, Florida, 33136, USA. .,Department of Cell Biology, University of Miami Miller School of Medicine, Miami, FL, 33136, USA.
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Abstract
Size and shape are important aspects of nuclear structure. While normal cells maintain nuclear size within a defined range, altered nuclear size and shape are associated with a variety of diseases. It is unknown if altered nuclear morphology contributes to pathology, and answering this question requires a better understanding of the mechanisms that control nuclear size and shape. In this review, we discuss recent advances in our understanding of the mechanisms that regulate nuclear morphology, focusing on nucleocytoplasmic transport, nuclear lamins, the endoplasmic reticulum, the cell cycle, and potential links between nuclear size and size regulation of other organelles. We then discuss the functional significance of nuclear morphology in the context of early embryonic development. Looking toward the future, we review new experimental approaches that promise to provide new insights into mechanisms of nuclear size control, in particular microfluidic-based technologies, and discuss how altered nuclear morphology might impact chromatin organization and physiology of diseased cells.
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Affiliation(s)
- Richik N Mukherjee
- a Department of Molecular Biology , University of Wyoming , Laramie , WY USA
| | - Pan Chen
- a Department of Molecular Biology , University of Wyoming , Laramie , WY USA
| | - Daniel L Levy
- a Department of Molecular Biology , University of Wyoming , Laramie , WY USA
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35
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Abstract
The GATA family of transcription factors consists of six proteins (GATA1-6) which are
involved in a variety of physiological and pathological processes. GATA1/2/3 are required
for differentiation of mesoderm and ectoderm-derived tissues, including the haematopoietic
and central nervous system. GATA4/5/6 are implicated in development and differentiation of
endoderm- and mesoderm-derived tissues such as induction of differentiation of embryonic
stem cells, cardiovascular embryogenesis and guidance of epithelial cell differentiation
in the adult.
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36
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Pihlajoki M, Färkkilä A, Soini T, Heikinheimo M, Wilson DB. GATA factors in endocrine neoplasia. Mol Cell Endocrinol 2016; 421:2-17. [PMID: 26027919 PMCID: PMC4662929 DOI: 10.1016/j.mce.2015.05.027] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/01/2015] [Revised: 04/26/2015] [Accepted: 05/09/2015] [Indexed: 02/07/2023]
Abstract
GATA transcription factors are structurally-related zinc finger proteins that recognize the consensus DNA sequence WGATAA (the GATA motif), an essential cis-acting element in the promoters and enhancers of many genes. These transcription factors regulate cell fate specification and differentiation in a wide array of tissues. As demonstrated by genetic analyses of mice and humans, GATA factors play pivotal roles in the development, homeostasis, and function of several endocrine organs including the adrenal cortex, ovary, pancreas, parathyroid, pituitary, and testis. Additionally, GATA factors have been shown to be mutated, overexpressed, or underexpressed in a variety of endocrine tumors (e.g., adrenocortical neoplasms, parathyroid tumors, pituitary adenomas, and sex cord stromal tumors). Emerging evidence suggests that GATA factors play a direct role in the initiation, proliferation, or propagation of certain endocrine tumors via modulation of key developmental signaling pathways implicated in oncogenesis, such as the WNT/β-catenin and TGFβ pathways. Altered expression or function of GATA factors can also affect the metabolism, ploidy, and invasiveness of tumor cells. This article provides an overview of the role of GATA factors in endocrine neoplasms. Relevant animal models are highlighted.
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Affiliation(s)
- Marjut Pihlajoki
- Children's Hospital, Helsinki University Central Hospital, University of Helsinki, 00290 Helsinki, Finland
| | - Anniina Färkkilä
- Children's Hospital, Helsinki University Central Hospital, University of Helsinki, 00290 Helsinki, Finland; Department of Obstetrics and Gynecology, Helsinki University Central Hospital, University of Helsinki, 00290 Helsinki, Finland
| | - Tea Soini
- Children's Hospital, Helsinki University Central Hospital, University of Helsinki, 00290 Helsinki, Finland
| | - Markku Heikinheimo
- Children's Hospital, Helsinki University Central Hospital, University of Helsinki, 00290 Helsinki, Finland; Department of Pediatrics, St. Louis Children's Hospital, Washington University School of Medicine, St. Louis, MO 63110, USA
| | - David B Wilson
- Department of Pediatrics, St. Louis Children's Hospital, Washington University School of Medicine, St. Louis, MO 63110, USA; Department of Developmental Biology, Washington University School of Medicine, St. Louis, MO 63110, USA.
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Capo-chichi CD, Aguida B, Chabi NW, Cai QK, Offrin G, Agossou VK, Sanni A, Xu XX. Lamin A/C deficiency is an independent risk factor for cervical cancer. Cell Oncol (Dordr) 2015; 39:59-68. [PMID: 26537870 DOI: 10.1007/s13402-015-0252-6] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/22/2015] [Indexed: 01/11/2023] Open
Abstract
BACKGROUND In the past, cervical cancer has been linked to Human Papilloma Virus (HPV) infection. Previously, we found that pre-neoplastic breast and ovarian lesions may be associated with lamin A/C deficiency, resulting in abnormal nuclear morphologies and chromosomal instability. Ultimately, these phenomena are thought to lead to cancer. Here, we assessed lamin A/C deficiency as an indicator for the risk to develop cervical cancer. METHODS The expression of lamin A/C was assessed by Western blotting in cervical uterine smears (CUS) of 76 adult women from Benin concomitant with nuclear morphology assessment and HPV genotyping using microscopy and PCR-based assays, respectively. In vitro analyses were performed to uncover the mechanism underlying lamin A/C expression alterations observed in vivo. The presence of cervical intra-epithelial neoplasia (CIN) was assessed by colposcopy. RESULTS Normal lamin A/C expression (group A) was observed in 39% of the CUS, weak lamin A/C expression (group B) was observed in 28% of the CUS and no lamin A/C expression (group C) was observed in 33% of the CUS tested. Infection with oncogenic HPV was found to be significantly higher in group C (36%) than in groups A (17%) and B (14%). Two years after our first assessment, CIN was observed in 20% of the women in group C. The in vitro application of either a histone deacetylase inhibitor (trichostatin) or a protein kinase inhibitor (staurosporine) was found to restore lamin A/C expression in cervical cancer-derived cells. CONCLUSION Lamin A/C deficiency may serve as an independent risk factor for CIN development and as an indicator for preventive therapy in cervical cancer.
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Affiliation(s)
- Callinice D Capo-chichi
- Faculty of Sciences and Technology (FAST)/Institute of Biomedical Sciences and Applications (ISBA), University of Abomey-Calavi (UAC), Abomey Calavi, Benin. .,National University Hospital (CNHU), Cotonou, BENIN. .,Unit of Biochemistry and Molecular Biology (UBBM), Section of Molecular Biomarkers in Cancer and Nutrition (BMCN), Faculty of Sciences and Technology (FAST), Institute of Biomedical Sciences and Applications (ISBA), University Abomey-Calavi (UAC), 04BP488, Cotonou, Benin.
| | - Blanche Aguida
- Faculty of Sciences and Technology (FAST)/Institute of Biomedical Sciences and Applications (ISBA), University of Abomey-Calavi (UAC), Abomey Calavi, Benin.
| | - Nicodème W Chabi
- Faculty of Sciences and Technology (FAST)/Institute of Biomedical Sciences and Applications (ISBA), University of Abomey-Calavi (UAC), Abomey Calavi, Benin.
| | - Qi K Cai
- Fox Chase Cancer Center, Philadelphia, PA, 19111, USA.
| | | | | | - Ambaliou Sanni
- Faculty of Sciences and Technology (FAST)/Institute of Biomedical Sciences and Applications (ISBA), University of Abomey-Calavi (UAC), Abomey Calavi, Benin.
| | - Xiang-Xi Xu
- Sylvester Cancer Center/Miller Medical School of Medicine, University of Miami, Coral Gables, FL, USA.
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A loss-of-function and H2B-Venus transcriptional reporter allele for Gata6 in mice. BMC DEVELOPMENTAL BIOLOGY 2015; 15:38. [PMID: 26498761 PMCID: PMC4619391 DOI: 10.1186/s12861-015-0086-5] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/05/2015] [Accepted: 10/09/2015] [Indexed: 12/03/2022]
Abstract
Background The GATA-binding factor 6 (Gata6) gene encodes a zinc finger transcription factor that often functions as a key regulator of lineage specification during development. It is the earliest known marker of the primitive endoderm lineage in the mammalian blastocyst. During gastrulation, GATA6 is expressed in early cardiac mesoderm and definitive endoderm progenitors, and is necessary for development of specific mesoderm and endoderm-derived organs including the heart, liver, and pancreas. Furthermore, reactivation or silencing of the Gata6 locus has been associated with certain types of cancer affecting endodermal organs. Results We have generated a Gata6H2B-Venus knock-in reporter mouse allele for the purpose of labeling GATA6-expressing cells with a bright nuclear-localized fluorescent marker that is suitable for live imaging at single-cell resolution. Conclusions Expression of the Venus reporter was characterized starting from embryonic stem (ES) cells, through mouse embryos and adult animals. The Venus reporter was not expressed in ES cells, but was activated upon endoderm differentiation. Gata6H2B-Venus/H2B-Venus homozygous embryos did not express GATA6 protein and failed to specify the primitive endoderm in the blastocyst. However, null blastocysts continued to express high levels of Venus in the absence of GATA6 protein, suggesting that early Gata6 transcription is independent of GATA6 protein expression. At early post-implantation stages of embryonic development, there was a strong correlation of Venus with endogenous GATA6 protein in endoderm and mesoderm progenitors, then later in the heart, midgut, and hindgut. However, there were discrepancies in reporter versus endogenous protein expression in certain cells, such as the body wall and endocardium. During organogenesis, detection of Venus in specific organs recapitulated known sites of endogenous GATA6 expression, such as in the lung bud epithelium, liver, pancreas, gall bladder, stomach epithelium, and vascular endothelium. In adults, Venus was observed in the lungs, pancreas, liver, gall bladder, ovaries, uterus, bladder, skin, adrenal glands, small intestine and corpus region of the stomach. Overall, Venus fluorescent protein under regulatory control of the Gata6 locus was expressed at levels that were easily visualized directly and could endure live and time-lapse imaging techniques. Venus is co-expressed with endogenous GATA6 throughout development to adulthood, and should provide an invaluable tool for examining the status of the Gata6 locus during development, as well as its silencing or reactivation in cancer or other disease states. Electronic supplementary material The online version of this article (doi:10.1186/s12861-015-0086-5) contains supplementary material, which is available to authorized users.
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Expression of nuclear membrane proteins in normal, hyperplastic, and neoplastic thyroid epithelial cells. Virchows Arch 2015; 467:427-36. [DOI: 10.1007/s00428-015-1816-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2015] [Revised: 05/30/2015] [Accepted: 07/20/2015] [Indexed: 10/23/2022]
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Davies LC, Taylor PR. Tissue-resident macrophages: then and now. Immunology 2015; 144:541-8. [PMID: 25684236 PMCID: PMC4368161 DOI: 10.1111/imm.12451] [Citation(s) in RCA: 231] [Impact Index Per Article: 25.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2015] [Revised: 02/06/2015] [Accepted: 02/09/2015] [Indexed: 12/12/2022] Open
Abstract
Macrophages have been at the heart of immune research for over a century and are an integral component of innate immunity. Macrophages are often viewed as terminally differentiated monocytic phagocytes. They infiltrate tissues during inflammation, and form polarized populations that perform pro-inflammatory or anti-inflammatory functions. Tissue-resident macrophages were regarded as differentiated monocytes, which seed the tissues to perform immune sentinel and homeostatic functions. However, tissue-resident macrophages are not a homogeneous population, but are in fact a grouping of cells with similar functions and phenotypes. In the last decade, it has been revealed that many of these cells are not terminally differentiated and, in most cases, are not derived from haematopoiesis in the adult. Recent research has highlighted that tissue-resident macrophages cannot be grouped into simple polarized categories, especially in vivo, when they are exposed to complex signalling events. It has now been demonstrated that the tissue environment itself is a major controller of macrophage phenotype, and can influence the expression of many genes regardless of origin. This is consistent with the concept that cells within different tissues have diverse responses in inflammation. There is still a mountain to climb in the field, as it evolves to encompass not only tissue-resident macrophage diversity, but also categorization of specific tissue environments and the plasticity of macrophages themselves. This knowledge provides a new perspective on therapeutic strategies, as macrophage subsets can potentially be manipulated to control the inflammatory environment in a tissue-specific manner.
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Affiliation(s)
- Luke C Davies
- Cancer Inflammation Program, National Cancer Institute at Frederick, NIH, Frederick, MD, USA
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Heikinheimo M, Pihlajoki M, Schrade A, Kyrönlahti A, Wilson DB. Testicular steroidogenic cells to the rescue. Endocrinology 2015; 156:1616-9. [PMID: 25886071 DOI: 10.1210/en.2015-1222] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Markku Heikinheimo
- Departments of Pediatrics and Developmental Biology (M.H., D.B.W.), Washington University School of Medicine and St Louis Children's Hospital, St Louis, Missouri 63110; and Children's Hospital (M.H., M.P., A.S., A.K.), University of Helsinki and Helsinki Central Hospital, 00290 Helsinki, Finland
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Abstract
Nuclear envelope (NE) proteins have fundamental roles in maintaining nuclear structure, cell signaling, chromatin organization, and gene regulation, and mutations in genes encoding NE components were identified as primary cause of a number of age associated diseases and cancer. Nesprin-1 belongs to a family of multi-isomeric NE proteins that are characterized by spectrin repeats. We analyzed NE components in various tumor cell lines and found that Nesprin-1 levels were strongly reduced associated with alterations in further NE components. By reducing the amounts of Nesprin-1 by RNAi mediated knockdown, we could reproduce those alterations in mouse and human cell lines. In a search for novel Nesprin-1 binding proteins, we identified MSH2 and MSH6, proteins of the DNA damage response pathway, as interactors and found alterations in the corresponding pathways in cells with lower Nesprin-1 levels. We also noticed increased number of γH2AX foci in the absence of exogenous DNA damage as was seen in tumor cells. The levels of phosphorylated kinases Chk1 and 2 were altered in a manner resembling tumor cells and the levels of Ku70 were low and the protein was not recruited to the DNA after hydroxyurea (HU) treatment. Our findings indicate a role for Nesprin-1 in the DNA damage response pathway and propose Nesprin-1 as novel player in tumorigenesis and genome instability.
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Affiliation(s)
- Ilknur Sur
- Institute of Biochemistry I; Medical Faculty; Center for Molecular Medicine Cologne (CMMC) and Cologne Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases (CECAD); University of Cologne; Cologne, Germany
| | - Sascha Neumann
- Institute of Biochemistry I; Medical Faculty; Center for Molecular Medicine Cologne (CMMC) and Cologne Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases (CECAD); University of Cologne; Cologne, Germany
| | - Angelika A Noegel
- Institute of Biochemistry I; Medical Faculty; Center for Molecular Medicine Cologne (CMMC) and Cologne Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases (CECAD); University of Cologne; Cologne, Germany
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Rosas M, Davies LC, Giles PJ, Liao CT, Kharfan B, Stone TC, O'Donnell VB, Fraser DJ, Jones SA, Taylor PR. The transcription factor Gata6 links tissue macrophage phenotype and proliferative renewal. Science 2014; 344:645-648. [PMID: 24762537 DOI: 10.1126/science.1251414] [Citation(s) in RCA: 279] [Impact Index Per Article: 27.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Tissue-resident macrophages are heterogeneous as a consequence of anatomical niche-specific functions. Many populations self-renew independently of bone marrow in the adult, but the molecular mechanisms of this are poorly understood. We determined a transcriptional profile for the major self-renewing population of peritoneal macrophages in mice. These cells specifically expressed the transcription factor Gata6. Selective deficiency of Gata6 in myeloid cells caused substantial alterations in the transcriptome of peritoneal macrophages. Gata6 deficiency also resulted in dysregulated peritoneal macrophage proliferative renewal during homeostasis and in response to inflammation, which was associated with delays in the resolution of inflammation. Our investigations reveal that the tissue macrophage phenotype is under discrete tissue-selective transcriptional control and that this is fundamentally linked to the regulation of their proliferation renewal.
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Affiliation(s)
- Marcela Rosas
- Cardiff Institute of Infection and Immunity, Cardiff University School of Medicine, Heath Park, Cardiff, CF14 4XN, UK
| | - Luke C Davies
- Cardiff Institute of Infection and Immunity, Cardiff University School of Medicine, Heath Park, Cardiff, CF14 4XN, UK
| | - Peter J Giles
- Central Biotechnology Services, Cardiff University School of Medicine, Heath Park, Cardiff, CF14 4XN, UK
| | - Chia-Te Liao
- Cardiff Institute of Infection and Immunity, Cardiff University School of Medicine, Heath Park, Cardiff, CF14 4XN, UK
| | - Bashar Kharfan
- Cardiff Institute of Infection and Immunity, Cardiff University School of Medicine, Heath Park, Cardiff, CF14 4XN, UK
| | - Timothy C Stone
- Central Biotechnology Services, Cardiff University School of Medicine, Heath Park, Cardiff, CF14 4XN, UK
| | - Valerie B O'Donnell
- Cardiff Institute of Infection and Immunity, Cardiff University School of Medicine, Heath Park, Cardiff, CF14 4XN, UK
| | - Donald J Fraser
- Institute of Molecular Medicine, Cardiff University School of Medicine, Heath Park, Cardiff, CF14 4XN, UK
| | - Simon A Jones
- Cardiff Institute of Infection and Immunity, Cardiff University School of Medicine, Heath Park, Cardiff, CF14 4XN, UK
| | - Philip R Taylor
- Cardiff Institute of Infection and Immunity, Cardiff University School of Medicine, Heath Park, Cardiff, CF14 4XN, UK
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Abstract
Despite decades of research, cancer metastasis remains an incompletely understood process that is as complex as it is devastating. In recent years, there has been an increasing push to investigate the biomechanical aspects of tumorigenesis, complementing the research on genetic and biochemical changes. In contrast to the high genetic variability encountered in cancer cells, almost all metastatic cells are subject to the same physical constraints as they leave the primary tumor, invade surrounding tissues, transit through the circulatory system, and finally infiltrate new tissues. Advances in live cell imaging and other biophysical techniques, including measurements of subcellular mechanics, have yielded stunning new insights into the physics of cancer cells. While much of this research has been focused on the mechanics of the cytoskeleton and the cellular microenvironment, it is now emerging that the mechanical properties of the cell nucleus and its connection to the cytoskeleton may play a major role in cancer metastasis, as deformation of the large and stiff nucleus presents a substantial obstacle during the passage through the dense interstitial space and narrow capillaries. Here, we present an overview of the molecular components that govern the mechanical properties of the nucleus, and we discuss how changes in nuclear structure and composition observed in many cancers can modulate nuclear mechanics and promote metastatic processes. Improved insights into this interplay between nuclear mechanics and metastatic progression may have powerful implications in cancer diagnostics and therapy and may reveal novel therapeutic targets for pharmacological inhibition of cancer cell invasion.
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Affiliation(s)
- Celine Denais
- Department of Biomedical Engineering, Weill Institute for Cell and Molecular Biology, Cornell University, Ithaca, NY, 14853, USA,
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Nacoulma AP, Megalizzi V, Pottier LR, De Lorenzi M, Thoret S, Dubois J, Vandeputte OM, Duez P, Vereecke D, Jaziri ME. Potent antiproliferative cembrenoids accumulate in tobacco upon infection with Rhodococcus fascians and trigger unusual microtubule dynamics in human glioblastoma cells. PLoS One 2013; 8:e77529. [PMID: 24167576 PMCID: PMC3805576 DOI: 10.1371/journal.pone.0077529] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2013] [Accepted: 09/10/2013] [Indexed: 12/26/2022] Open
Abstract
AIMS Though plant metabolic changes are known to occur during interactions with bacteria, these were rarely challenged for pharmacologically active compounds suitable for further drug development. Here, the occurrence of specific chemicals with antiproliferative activity against human cancer cell lines was evidenced in hyperplasia (leafy galls) induced when plants interact with particular phytopathogens, such as the Actinomycete Rhodococcus fascians. METHODS We examined leafy galls fraction F3.1.1 on cell proliferation, cell division and cytoskeletal disorganization of human cancer cell lines using time-lapse videomicroscopy imaging, combined with flow cytometry and immunofluorescence analysis. We determined the F3.1.1-fraction composition by gas chromatography coupled to mass spectrometry. RESULTS The leafy galls induced on tobacco by R. fascians yielded fraction F3.1.1 which inhibited proliferation of glioblastoma U373 cells with an IC50 of 4.5 µg/mL, F.3.1.1 was shown to increase cell division duration, cause nuclear morphological deformations and cell enlargement, and, at higher concentrations, karyokinesis defects leading to polyploidization and apoptosis. F3.1.1 consisted of a mixture of isomers belonging to the cembrenoids. The cellular defects induced by F3.1.1 were caused by a peculiar cytoskeletal disorganization, with the occurrence of fragmented tubulin and strongly organized microtubule aggregates within the same cell. Colchicine, paclitaxel, and cembrene also affected U373 cell proliferation and karyokinesis, but the induced microtubule rearrangement was very different from that provoked by F3.1.1. Altogether our data indicate that the cembrenoid isomers in F3.1.1 have a unique mode of action and are able to simultaneously modulate microtubule polymerization and stability.
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Affiliation(s)
- Aminata P. Nacoulma
- Laboratoire de Toxicologie, Faculté de Pharmacie, Université Libre de Bruxelles, Brussels, Belgium
| | - Veronique Megalizzi
- Laboratoire de Toxicologie, Faculté de Pharmacie, Université Libre de Bruxelles, Brussels, Belgium
| | - Laurent R. Pottier
- Laboratoire de Pharmacognosie, de Bromatologie et de Nutrition Humaine, Faculté de Pharmacie, Université Libre de Bruxelles, Brussels, Belgium
| | - Manuela De Lorenzi
- Laboratoire de Toxicologie, Faculté de Pharmacie, Université Libre de Bruxelles, Brussels, Belgium
| | - Sylviane Thoret
- Institut de Chimie des Substances Naturelles, Centre national de la recherche scientifique Unité PR 2301, Gif-sur-Yvette, France
| | - Joëlle Dubois
- Institut de Chimie des Substances Naturelles, Centre national de la recherche scientifique Unité PR 2301, Gif-sur-Yvette, France
| | - Olivier M. Vandeputte
- Laboratoire de Biotechnologie Végétale, Faculté des Sciences, Université Libre de Bruxelles, Gosselies, Belgium
| | - Pierre Duez
- Laboratoire de Pharmacognosie, de Bromatologie et de Nutrition Humaine, Faculté de Pharmacie, Université Libre de Bruxelles, Brussels, Belgium
| | - Danny Vereecke
- Department of Plant Production, University College Ghent, Ghent University, Gent, Belgium
| | - Mondher El Jaziri
- Laboratoire de Biotechnologie Végétale, Faculté des Sciences, Université Libre de Bruxelles, Gosselies, Belgium
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Bhatia A, Kumar Y. Relevance of microscopic indicators of chromosomal instability in routine reporting of malignancies. Diagn Cytopathol 2013; 42:181-8. [PMID: 23754835 DOI: 10.1002/dc.23012] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2012] [Revised: 02/22/2013] [Accepted: 04/04/2013] [Indexed: 11/12/2022]
Abstract
Chromosomal instability (CIN) is the defining feature of most human cancers. The role of CIN has been suggested in diagnosis and prognostication of the tumors since long. However, the molecular methods used for its identification are costly, require expertise and may not be available in many of the laboratories. Therefore, this article tries to revisit the already described morphological indicators of CIN like multipolar mitoses, chromatin bridges, chromatin strings, nuclear heterogeneity, laggards, nuclear buds, micronuclei, and multinucleated micronucleated cells. The role of above as morphological biomarkers in diagnosis and prognosis of various cancers has been reviewed and the possibility of their inclusion in day to day reporting of malignancies is also discussed.
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Affiliation(s)
- Alka Bhatia
- Department of Experimental Medicine and Biotechnology, Postgraduate Institute of Medical Education and Research, Chandigarh, 160012, India
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Microproteomics by liquid extraction surface analysis: Application to FFPE tissue to study the fimbria region of tubo-ovarian cancer. Proteomics Clin Appl 2013; 7:234-40. [DOI: 10.1002/prca.201200070] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2012] [Revised: 10/26/2012] [Accepted: 12/17/2012] [Indexed: 11/07/2022]
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Capo-chichi CD, Cai KQ, Smedberg J, Ganjei-Azar P, Godwin AK, Xu XX. Loss of A-type lamin expression compromises nuclear envelope integrity in breast cancer. CHINESE JOURNAL OF CANCER 2012; 30:415-25. [PMID: 21627864 PMCID: PMC3941915 DOI: 10.5732/cjc.010.10566] [Citation(s) in RCA: 78] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Through advances in technology, the genetic basis of cancer has been investigated at the genomic level, and many fundamental questions have begun to be addressed. Among several key unresolved questions in cancer biology, the molecular basis for the link between nuclear deformation and malignancy has not been determined. Another hallmark of human cancer is aneuploidy; however, the causes and consequences of aneuploidy are unanswered and are hotly contested topics. We found that nuclear lamina proteins lamin A/C are absent in a significant fraction (38%) of human breast cancer tissues. Even in lamin A/C–positive breast cancer, lamin A/C expression is heterogeneous or aberrant (such as non-nuclear distribution) in the population of tumor cells, as determined by immunohistology and immunofluorescence microscopy. In most breast cancer cell lines, a significant fraction of the lamin A/C– negative population was observed. To determine the consequences of the loss of lamin A/C, we suppressed their expression by shRNA in non-cancerous primary breast epithelial cells. Down-regulation of lamin A/C in breast epithelial cells led to morphological deformation, resembling that of cancer cells, as observed by immunofluorescence microscopy. The lamin A/C–suppressed breast epithelial cells developed aneuploidy as determined by both flow Cytometry and fluorescence in situ hybridization. We conclude that the loss of nuclear envelope structural proteins lamin A/C in breast cancer underlies the two hallmarks of cancer aberrations in nuclear morphology and aneuploidy.
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Affiliation(s)
- Callinice D Capo-chichi
- Sylvester Comprehensive Cancer Center, University of Miami School of Medicine, Miami, FL 33136, USA
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Abstract
Background: Genomic stability is one of the crucial prognostic factors for patients with endometrioid endometrial cancer (EEC). The impact of genomic stability on the tumour tissue proteome of EEC is not yet well established. Methods: Tissue lysates of EEC, squamous cervical cancer (SCC), normal endometrium and squamous cervical epithelium were subjected to two-dimensional (2D) gel electrophoresis and identification of proteins by MALDI TOF MS. Expression of selected proteins was analysed in independent samples by immunohistochemistry. Results: Diploid and aneuploid genomically unstable EEC displayed similar patterns of protein expression. This was in contrast to diploid stable EEC, which displayed a protein expression profile similar to normal endometrium. Approximately 10% of the differentially expressed proteins in EEC were specific for this type of cancer with differential expression of other proteins observed in other types of malignancy (e.g., SCC). Selected proteins differentially expressed in 2D gels of EEC were further analysed in an EEC precursor lesion, that is, atypical hyperplasia of endometrium, and showed increased expression of CLIC1, EIF4A1 and PRDX6 and decreased expression of ENO1, ANXA4, EMD and Ku70. Conclusion: Protein expression in diploid and aneuploid genomically unstable EEC is different from the expression profile of proteins in diploid genomically stable EEC. We showed that changes in expression of proteins typical for EEC could already be detected in precursor lesions, that is, atypical hyperplasia of endometrium, highlighting their clinical potential for improving early diagnostics of EEC.
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Abstract
Because of the association between aberrant nuclear structure and tumour grade, nuclear morphology is an indispensible criterion in the current pathological assessment of cancer. Components of the nuclear envelope environment have central roles in many aspects of cell function that affect tumour development and progression. As the roles of the nuclear envelope components, including nuclear pore complexes and nuclear lamina, are being deciphered in molecular detail there are opportunities to harness this knowledge for cancer therapeutics and biomarker development. In this Review, we summarize the progress that has been made in our understanding of the nuclear envelope and the implications of changes in this environment for cancer biology.
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Affiliation(s)
- Kin-Hoe Chow
- Department of Oncological Sciences, Huntsman Cancer Institute, University of Utah, Salt Lake City, Utah 84112, USA
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