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Harbin LM, Lin N, Ueland FR, Kolesar JM. SYNE1 Mutation Is Associated with Increased Tumor Mutation Burden and Immune Cell Infiltration in Ovarian Cancer. Int J Mol Sci 2023; 24:14212. [PMID: 37762518 PMCID: PMC10531966 DOI: 10.3390/ijms241814212] [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: 07/25/2023] [Revised: 08/17/2023] [Accepted: 08/23/2023] [Indexed: 09/29/2023] Open
Abstract
SYNE1, a nuclear envelope protein critical for cellular structure and signaling, is downregulated in numerous malignancies. SYNE1 alterations are found in 10% of gynecologic malignancies and 5% of epithelial ovarian cancers. Previous studies demonstrated an association between SYNE1 mutation, increased tumor mutation burden (TMB), and immunotherapy response. This study evaluates the SYNE1 mutation frequency, association with TMB, and downstream effects of SYNE1 mutation in ovarian cancer. Genetic information, including whole-exome sequencing, RNA analysis, and somatic tumor testing, was obtained for consenting ovarian cancer patients at an academic medical center. Mutation frequencies were compared between the institutional cohort and The Cancer Genome Atlas (TCGA). Bioinformatics analyses were performed. In our cohort of 50 patients, 16 had a SYNE1 mutation, and 15 had recurrent disease. Median TMB for SYNE1 mutated patients was 25 compared to 7 for SYNE1 wild-type patients (p < 0.0001). Compared to the TCGA cohort, our cohort had higher SYNE1 mutation rates (32% vs. 6%, p < 0.001). Gene expression related to immune cell trafficking, inflammatory response, and immune response (z > 2.0) was significantly increased in SYNE1 mutated patients. SYNE1 mutation is associated with increased TMB and immune cell infiltration in ovarian cancer and may serve as an additional biomarker for immunotherapy response.
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Affiliation(s)
- Laura M. Harbin
- Division of Gynecologic Oncology, Department of Obstetrics and Gynecology, University of Kentucky Markey Cancer Center, 800 Rose Street, Lexington, KY 20536-0596, USA
| | - Nan Lin
- Department of Pharmacy Practice and Science, University of Kentucky College of Pharmacy, 760 Press Avenue, Lexington, KY 40536-0596, USA
| | - Frederick R. Ueland
- Division of Gynecologic Oncology, Department of Obstetrics and Gynecology, University of Kentucky Markey Cancer Center, 800 Rose Street, Lexington, KY 20536-0596, USA
| | - Jill M. Kolesar
- Division of Gynecologic Oncology, Department of Obstetrics and Gynecology, University of Kentucky Markey Cancer Center, 800 Rose Street, Lexington, KY 20536-0596, USA
- Department of Pharmacy Practice and Science, University of Kentucky College of Pharmacy, 760 Press Avenue, Lexington, KY 40536-0596, USA
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2
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Fracchia A, Asraf T, Salmon-Divon M, Gerlitz G. Increased Lamin B1 Levels Promote Cell Migration by Altering Perinuclear Actin Organization. Cells 2020; 9:E2161. [PMID: 32987785 PMCID: PMC7598699 DOI: 10.3390/cells9102161] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2020] [Revised: 09/06/2020] [Accepted: 09/23/2020] [Indexed: 02/06/2023] Open
Abstract
Cell migration requires reposition and reshaping of the cell nucleus. The nuclear lamina is highly important for migration of both primary and cancer cells. B-type lamins are important for proper migration of epicardial cells and neurons and increased lamin B to lamin A ratio accelerates cancer cell migration through confined spaces. Moreover, a positive association between lamin B1 levels and tumor formation and progression is found in various cancer types. Still, the molecular mechanism by which B-type lamins promote cell migration is not fully understood. To better understand this mechanism, we tested the effects of lamin B1 on perinuclear actin organization. Here we show that induction of melanoma cell migration leads to the formation of a cytosolic Linker of Nucleoskeleton and Cytoskeleton (LINC) complex-independent perinuclear actin rim, which has not been detected in migrating cells, yet. Significantly, increasing the levels of lamin B1 but not the levels of lamin A prevented perinuclear actin rim formation while accelerated the cellular migration rate. To interfere with the perinuclear actin rim, we generated a chimeric protein that is localized to the outer nuclear membrane and cleaves perinuclear actin filaments in a specific manner without disrupting other cytosolic actin filaments. Using this tool, we found that disruption of the perinuclear actin rim accelerated the cellular migration rate in a similar manner to lamin B1 over-expression. Taken together, our results suggest that increased lamin B1 levels can accelerate cell migration by inhibiting the association of the nuclear envelope with actin filaments that may reduce nuclear movement and deformability.
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Affiliation(s)
- Andrea Fracchia
- Department of Molecular Biology, Faculty of Life Sciences and Ariel Center for Applied Cancer Research, Ariel University, Ariel 40700, Israel; (A.F.); (T.A.); (M.S.-D.)
| | - Tal Asraf
- Department of Molecular Biology, Faculty of Life Sciences and Ariel Center for Applied Cancer Research, Ariel University, Ariel 40700, Israel; (A.F.); (T.A.); (M.S.-D.)
| | - Mali Salmon-Divon
- Department of Molecular Biology, Faculty of Life Sciences and Ariel Center for Applied Cancer Research, Ariel University, Ariel 40700, Israel; (A.F.); (T.A.); (M.S.-D.)
- Adelson School of Medicine, Ariel University, Ariel 40700, Israel
| | - Gabi Gerlitz
- Department of Molecular Biology, Faculty of Life Sciences and Ariel Center for Applied Cancer Research, Ariel University, Ariel 40700, Israel; (A.F.); (T.A.); (M.S.-D.)
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3
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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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4
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Klingler-Hoffmann M, Mittal P, Hoffmann P. The Emerging Role of Cytoskeletal Proteins as Reliable Biomarkers. Proteomics 2019; 19:e1800483. [PMID: 31525818 DOI: 10.1002/pmic.201800483] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2019] [Revised: 07/12/2019] [Indexed: 12/26/2022]
Abstract
Cytoskeletal proteins are essential building blocks of cells. More than 100 cytoskeletal and cytoskeleton-associated proteins are known and for some, their function and regulation are understood in great detail. Apart from cell shape and support, they facilitate many processes such as intracellular signaling and transport, and cancer related processes such as proliferation, migration, and invasion. During the last decade, comparative proteomic studies have identified cytoskeletal proteins as in vitro markers for tumor progression and metastasis. Here, these results are summarized and a number of unrelated studies are highlighted, identifying the same cytoskeletal proteins as potential biomarkers. These findings might indicate that the abundance of these potential markers of tumor progression is associated with the biological outcome and are independent of the cancer origin. This correlates well with recently published results from the Cancer Genome Atlas, indicating that cancers show remarkable similarities in their analyzed molecular information, independent of their organ of origin. It is postulated that the quantification of cytoskeletal proteins in healthy tissues, tumors, in adjacent tissues, and in stroma, is a great source of molecular information, which might not only be used to classify tumors, but more importantly to predict patients' outcome or even best treatment choices.
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Affiliation(s)
- Manuela Klingler-Hoffmann
- Future Industries Institute, University of South Australia, Mawson Lakes Campus, Mawson Lakes, 5095, Australia
| | - Parul Mittal
- Adelaide Proteomics Centre, School of Biological Sciences, University of Adelaide, Adelaide, 5005, Australia
| | - Peter Hoffmann
- Future Industries Institute, University of South Australia, Mawson Lakes Campus, Mawson Lakes, 5095, Australia
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Detection of SUN1 Splicing Variants at the mRNA and Protein Levels in Cancer. Methods Mol Biol 2018. [PMID: 30141053 DOI: 10.1007/978-1-4939-8691-0_21] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
Abstract
The linker of nucleoskeleton and cytoskeleton (LINC) complex, containing the proteins SUN and nesprin, is the fundamental structural unit of the nuclear envelope. The neoplastic-based regulation of the LINC complex in cancer tissues has become increasingly recognized in recent years, including the altered expression, somatic mutation, and methylation of genes. However, precisely how mutations and deregulated expression of the LINC complex contribute to the pathogenic mechanisms of tumorigenesis remain to be elucidated, mainly because of several technical difficulties. First, both the SUN and SYNE (encoding nesprin) genes give rise to a vast number of splicing variants. Second, immunoprecipitation experiments of endogenous SUN and nesprin proteins are difficult owing to the lack of suitable reagents as well as the limited solubility of these proteins in mild extraction conditions. Here, we describe three protocols to investigate these aspects: (1) immunohistochemistry to determine the expression levels and localization of the LINC complex in cancer tissue, (2) detection of SUN1 splicing variants at the mRNA level, and (3) detection of SUN1 splicing variants and binding partners at the protein level.
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6
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Ji Y, Jiang J, Huang L, Feng W, Zhang Z, Jin L, Xing X. Sperm‑associated antigen 4 (SPAG4) as a new cancer marker interacts with Nesprin3 to regulate cell migration in lung carcinoma. Oncol Rep 2018; 40:783-792. [PMID: 29901114 PMCID: PMC6072301 DOI: 10.3892/or.2018.6473] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2017] [Accepted: 04/17/2018] [Indexed: 01/08/2023] Open
Abstract
Lung cancer is the most common cause of cancer-related deaths, and early diagnosis and targeted therapy are extremely important in the treatment of this disease. Sperm-associated antigen 4 (SPAG4) was recently found to be a novel cancer biomarker. In the present study, the expression of SPAG4 was revealed to be high in lung adenocarcinoma tissues as determined by western blotting and immunohistochemistry. SPAG4 knockdown by RNAi efficiently reduced the migration of the lung cancer A549 cells in vitro. Mechanistically, SPAG4 exerted its tumor promoting functions by interacting with Nesprin3 as determined by co-immunoprecipitation (Co-IP) and bimolecular fluorescence complementation (BiFC) techniques. In addition, immunofluorescence revealed that the level of SPAG4 in lung cancer cells could affect the location and expression of Nesprin3. Furthermore, silencing of Nesprin3 reduced the migration of A549 cells and we provided evidence to demonstrate that SPAG4 acted as a positive regulator of Nesprin3. The results revealed that SPAG4, in cooperation with Nesprin3, has a fundamental pathological function in the migration of lung carcinoma cells, and the SPAG4 gene may be useful for the clinical diagnosis and new treatment strategies in patients with lung cancer.
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Affiliation(s)
- Ying Ji
- Department of Cardiothoracic Surgery, Third Xiangya Hospital, Central South University, Changsha, Hunan 410013, P.R. China
| | - Jinquan Jiang
- Department of Cardiothoracic Surgery, Third Xiangya Hospital, Central South University, Changsha, Hunan 410013, P.R. China
| | - Lihua Huang
- Center for Medical Experiments, Third Xiangya Hospital, Central South University, Changsha, Hunan 410013, P.R. China
| | - Wei Feng
- Department of Cardiothoracic Surgery, Third Xiangya Hospital, Central South University, Changsha, Hunan 410013, P.R. China
| | - Zhang Zhang
- Department of Cardiothoracic Surgery, Third Xiangya Hospital, Central South University, Changsha, Hunan 410013, P.R. China
| | - Longyu Jin
- Department of Cardiothoracic Surgery, Third Xiangya Hospital, Central South University, Changsha, Hunan 410013, P.R. China
| | - Xiaowei Xing
- Center for Medical Experiments, Third Xiangya Hospital, Central South University, Changsha, Hunan 410013, P.R. China
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Potter C, Razafsky D, Wozniak D, Casey M, Penrose S, Ge X, Mahjoub MR, Hodzic D. The KASH-containing isoform of Nesprin1 giant associates with ciliary rootlets of ependymal cells. Neurobiol Dis 2018; 115:82-91. [PMID: 29630990 DOI: 10.1016/j.nbd.2018.04.006] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2017] [Revised: 02/25/2018] [Accepted: 04/04/2018] [Indexed: 12/14/2022] Open
Abstract
Biallelic nonsense mutations of SYNE1 underlie a variable array of cerebellar and non-cerebellar pathologies of unknown molecular etiology. SYNE1 encodes multiple isoforms of Nesprin1 that associate with the nuclear envelope, with large cerebellar synapses and with ciliary rootlets of photoreceptors. Using two novel mouse models, we determined the expression pattern of Nesprin1 isoforms in the cerebellum whose integrity and functions are invariably affected by SYNE1 mutations. We further show that a giant isoform of Nesprin1 associates with the ciliary rootlets of ependymal cells that line brain ventricles and establish that this giant ciliary isoform of Nesprin1 harbors a KASH domain. Whereas cerebellar phenotypes are not recapitulated in Nes1gSTOP/STOP mice, these mice display a significant increase of ventricular volume. Together, these data fuel novel hypotheses about the molecular pathogenesis of SYNE1 mutations and support that KASH proteins may localize beyond the nuclear envelope in vivo.
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Affiliation(s)
- C Potter
- Department of Developmental Biology, Washington University School of Medicine, 660 S. Euclid Ave, St Louis, MO 63110, USA
| | - D Razafsky
- Department of Developmental Biology, Washington University School of Medicine, 660 S. Euclid Ave, St Louis, MO 63110, USA
| | - D Wozniak
- Department of Psychiatry, Washington University School of Medicine, 660 S. Euclid Ave, St Louis, MO 63110, USA
| | - M Casey
- Department of Developmental Biology, Washington University School of Medicine, 660 S. Euclid Ave, St Louis, MO 63110, USA
| | - S Penrose
- Department of Developmental Biology, Washington University School of Medicine, 660 S. Euclid Ave, St Louis, MO 63110, USA
| | - X Ge
- Department of Radiology, Washington University School of Medicine, 660 S. Euclid Ave, St Louis, MO 63110, USA
| | - M R Mahjoub
- Department of Medicine, Washington University School of Medicine, 660 S. Euclid Ave, St Louis, MO 63110, USA
| | - D Hodzic
- Department of Developmental Biology, Washington University School of Medicine, 660 S. Euclid Ave, St Louis, MO 63110, USA.
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8
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Li M, Sun Q, Wang X. Transcriptional landscape of human cancers. Oncotarget 2018; 8:34534-34551. [PMID: 28427185 PMCID: PMC5470989 DOI: 10.18632/oncotarget.15837] [Citation(s) in RCA: 56] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2016] [Accepted: 02/08/2017] [Indexed: 12/21/2022] Open
Abstract
The homogeneity and heterogeneity in somatic mutations, copy number alterations and methylation across different cancer types have been extensively explored. However, the related exploration based on transcriptome data is lacking. In this study we explored gene expression profiles across 33 human cancer types using The Cancer Genome Atlas (TCGA) data. We identified consistently upregulated genes (such as E2F1, EZH2, FOXM1, MYBL2, PLK1, TTK, AURKA/B and BUB1) and consistently downregulated genes (such as SCARA5, MYOM1, NKAPL, PEG3, USP2, SLC5A7 and HMGCLL1) across various cancers. The dysregulation of these genes is likely to be associated with poor clinical outcomes in cancer. The dysregulated pathways commonly in cancers include cell cycle, DNA replication, repair, and recombination, Notch signaling, p53 signaling, Wnt signaling, TGFβ signaling, immune response etc. We also identified genes consistently upregulated or downregulated in highly-advanced cancers compared to lowly-advanced cancers. The highly (low) expressed genes in highly-advanced cancers are likely to have higher (lower) expression levels in cancers than in normal tissue, indicating that common gene expression perturbations drive cancer initiation and cancer progression. In addition, we identified a substantial number of genes exclusively dysregulated in a single cancer type or inconsistently dysregulated in different cancer types, demonstrating the intertumor heterogeneity. More importantly, we found a number of genes commonly dysregulated in various cancers such as PLP1, MYOM1, NKAPL and USP2 which were investigated in few cancer related studies, and thus represent our novel findings. Our study provides comprehensive portraits of transcriptional landscape of human cancers.
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Affiliation(s)
- Mengyuan Li
- School of Science, China Pharmaceutical University, Nanjing 211198, China
| | - Qingrong Sun
- School of Science, China Pharmaceutical University, Nanjing 211198, China
| | - Xiaosheng Wang
- Department of Basic Medicine, School of Basic Medicine and Clinical Pharmacy, China Pharmaceutical University, Nanjing 211198, China
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Huang W, Huang H, Wang L, Hu J, Song W. SUN1 silencing inhibits cell growth through G0/G1 phase arrest in lung adenocarcinoma. Onco Targets Ther 2017; 10:2825-2833. [PMID: 28652764 PMCID: PMC5476752 DOI: 10.2147/ott.s79727] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Purpose Cytoskeleton is critical for carcinoma cell proliferation, migration, and invasion. Sad-1 and UNC-84 domain containing 1 (SUN1) is one of the core linkers of nucleoskeleton and cytoskeleton. However, the functions of SUN1 in lung adenocarcinoma are largely unknown. Methods In this study, we first transduced the lentivirus delivering the short hairpin RNA (shRNA) against SUN1 to lung adenocarcinoma cells (A549 and 95D cells) with high efficiency. After lentivirus infection, quantitative real-time polymerase chain reaction and Western blotting were used to detect the expressions of SUN1 mRNA and protein. The cell proliferation and colony formation were detected by MTT assay and colony formation assay, respectively. The cell distribution in the cell cycle was analyzed by flow cytometry. Results Both mRNA and protein levels of SUN1 were significantly decreased in A549 and 95D cells after lentivirus infection, as indicated by quantitative real-time polymerase chain reaction and Western blot. Next, we found that cell proliferation and colony formation were markedly reduced in SUN1 silenced cells. Moreover, suppression of SUN1 led to cell cycle arrest at G0/G1 phase. Furthermore, Cyclin D1, CDK6, and CDK2 expressions were obviously reduced in A549 cells after SUN1 silencing. Conclusion These results suggest that SUN1 plays an essential role in proliferation of lung adenocarcinoma cells in vitro and may be used as a potential therapeutic target for the treatment of lung adenocarcinoma in the future.
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Affiliation(s)
- Weiyi Huang
- Department of Oncology, The First People's Hospital Affiliated to Shanghai Jiaotong University, Shanghai, People's Republic of China
| | - Haihua Huang
- Department of Oncology, The First People's Hospital Affiliated to Shanghai Jiaotong University, Shanghai, People's Republic of China
| | - Lei Wang
- Department of Oncology, The First People's Hospital Affiliated to Shanghai Jiaotong University, Shanghai, People's Republic of China
| | - Jiong Hu
- Department of Oncology, The First People's Hospital Affiliated to Shanghai Jiaotong University, Shanghai, People's Republic of China
| | - Weifeng Song
- Department of Oncology, The First People's Hospital Affiliated to Shanghai Jiaotong University, Shanghai, People's Republic of China
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10
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Specific localization of nesprin-1-α2, the short isoform of nesprin-1 with a KASH domain, in developing, fetal and regenerating muscle, using a new monoclonal antibody. BMC Cell Biol 2016; 17:26. [PMID: 27350129 PMCID: PMC4924313 DOI: 10.1186/s12860-016-0105-9] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2016] [Accepted: 06/20/2016] [Indexed: 01/25/2023] Open
Abstract
Background Nesprin-1-giant (1008kD) is a protein of the outer nuclear membrane that links nuclei to the actin cytoskeleton via amino-terminal calponin homology domains. The short nesprin-1 isoform, nesprin-1-α2, is present only in skeletal and cardiac muscle and several pathogenic mutations occur within it, but the functions of this short isoform without calponin homology domains are unclear. The aim of this study was to determine mRNA levels and protein localization of nesprin-1-α2 at different stages of muscle development in order to shed light on its functions. Results mRNA levels of all known nesprin-1 isoforms with a KASH domain were determined by quantitative PCR. The mRNA for the 111 kD muscle-specific short isoform, nesprin-1-α2, was not detected in pre-differentiation human myoblasts but was present at significant levels in multinucleate myotubes. We developed a monoclonal antibody against the unique amino-terminal sequence of nesprin-1-α2, enabling specific immunolocalization for the first time. Nesprin-1-α2 protein was undetectable in pre-differentiation myoblasts but appeared at the nuclear rim in post-mitotic, multinucleate myotubes and reached its highest levels in fetal muscle. In muscle from a Duchenne muscular dystrophy biopsy, nesprin-1-α2 protein was detected mainly in regenerating fibres expressing neonatal myosin. Nesprin-1-giant was present at all developmental stages, but was also highest in fetal and regenerating fibres. In fetal muscle, both isoforms were present in the cytoplasm, as well as at the nuclear rim. A pathogenic early stop codon (E7854X) in nesprin-1 caused reduced mRNA levels and loss of protein levels of both nesprin-1-giant and (unexpectedly) nesprin-1-α2, but did not affect myogenesis in vitro. Conclusions Nesprin-1-α2 mRNA and protein expression is switched on during myogenesis, alongside other known markers of muscle differentiation. The results show that nesprin-1-α2 is dynamically controlled and may be involved in some process occurring during early myofibre formation, such as re-positioning of nuclei.
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11
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Jimeno D, Santos E. A new functional role uncovered for RASGRF2 in control of nuclear migration in cone photoreceptors during postnatal retinal development. Small GTPases 2016; 8:26-30. [PMID: 27221061 DOI: 10.1080/21541248.2016.1189989] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022] Open
Abstract
Despite their homologous structure and central nervous system(CNS) expression patterns, the GRF1 and GRF2 guanine nucleotide exchange factors(GEF) appear to play distinct, non-overlapping functions in cellular excitability, synaptic plasticity or neuromodulation. We recently uncovered a new functional role of GRF2 controlling nuclear migration in cone photoreceptors during postnatal neuroepithelial differentiation of the mouse retina. Analyzing GRF2-KO mice, we detected the specific accumulation of abnormally located, "ectopic" cone photoreceptor nuclei in the photoreceptor segment(PS) layer of their retinas. This alteration was accompanied by defective electroretinograms(ERG) indicative of impaired cone-mediated visual function, and accumulation around the "ectopic" nuclei of signaling molecules known to be functionally relevant for intracellular organelle migration, cytoskeletal reorganization or cell polarity establishment including PAR3, PAR6, and the phosphorylated proteins pPAK, pMLC2 and pVASP. We propose a mechanism whereby the absence of a productive functional interaction between GRF2 and its downstream target CDC42 leads to altered formation/structure of PAR-containing, polarity-related macromolecular complexes and abnormal activation of downstream signaling mediated by activated, phosphorylated forms of PAK, VASP and MLC2. As cone photoreceptors are responsible for color vision and visual acuity, these observations are potentially relevant for degenerative diseases of the human retina, harboring almost double number of cones than mice.
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Affiliation(s)
- David Jimeno
- a Centro de Investigación del Cáncer-Instituto de Biología Molecular y Celular del Cáncer (CSIC- Universidad de Salamanca) , Salamanca , Spain
| | - Eugenio Santos
- a Centro de Investigación del Cáncer-Instituto de Biología Molecular y Celular del Cáncer (CSIC- Universidad de Salamanca) , Salamanca , Spain
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12
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O’Mara TA, Glubb DM, Painter JN, Cheng T, Dennis J, Attia J, Holliday EG, McEvoy M, Scott RJ, Ashton K, Proietto T, Otton G, Shah M, Ahmed S, Healey CS, Gorman M, Martin L, Hodgson S, Fasching PA, Hein A, Beckmann MW, Ekici AB, Hall P, Czene K, Darabi H, Li J, Dürst M, Runnebaum I, Hillemanns P, Dörk T, Lambrechts D, Depreeuw J, Annibali D, Amant F, Zhao H, Goode EL, Dowdy SC, Fridley BL, Winham SJ, Salvesen HB, Njølstad TS, Trovik J, Werner HMJ, Tham E, Liu T, Mints M, Bolla MK, Michailidou K, Tyrer JP, Wang Q, Hopper JL, Peto J, Swerdlow AJ, Burwinkel B, Brenner H, Meindl A, Brauch H, Lindblom A, Chang-Claude J, Couch FJ, Giles GG, Kristensen VN, Cox A, Pharoah PDP, Dunning AM, Tomlinson I, Easton DF, Thompson DJ, Spurdle AB. Comprehensive genetic assessment of the ESR1 locus identifies a risk region for endometrial cancer. Endocr Relat Cancer 2015; 22:851-61. [PMID: 26330482 PMCID: PMC4559752 DOI: 10.1530/erc-15-0319] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Excessive exposure to estrogen is a well-established risk factor for endometrial cancer (EC), particularly for cancers of endometrioid histology. The physiological function of estrogen is primarily mediated by estrogen receptor alpha, encoded by ESR1. Consequently, several studies have investigated whether variation at the ESR1 locus is associated with risk of EC, with conflicting results. We performed comprehensive fine-mapping analyses of 3633 genotyped and imputed single nucleotide polymorphisms (SNPs) in 6607 EC cases and 37 925 controls. There was evidence of an EC risk signal located at a potential alternative promoter of the ESR1 gene (lead SNP rs79575945, P=1.86×10(-5)), which was stronger for cancers of endometrioid subtype (P=3.76×10(-6)). Bioinformatic analysis suggests that this risk signal is in a functionally important region targeting ESR1, and eQTL analysis found that rs79575945 was associated with expression of SYNE1, a neighbouring gene. In summary, we have identified a single EC risk signal located at ESR1, at study-wide significance. Given SNPs located at this locus have been associated with risk for breast cancer, also a hormonally driven cancer, this study adds weight to the rationale for performing informed candidate fine-scale genetic studies across cancer types.
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Affiliation(s)
- Tracy A O’Mara
- Department of Genetics and Computational Biology, QIMR Berghofer Medical Research Institute, Brisbane, QLD, 4006, Australia
| | - Dylan M Glubb
- Department of Genetics and Computational Biology, QIMR Berghofer Medical Research Institute, Brisbane, QLD, 4006, Australia
| | - Jodie N Painter
- Department of Genetics and Computational Biology, QIMR Berghofer Medical Research Institute, Brisbane, QLD, 4006, Australia
| | - Timothy Cheng
- Wellcome Trust Centre for Human Genetics, University of Oxford, Oxford, OX3 7BN, UK
| | - Joe Dennis
- Centre for Cancer Genetic Epidemiology, Department of Public Health and Primary Care, University of Cambridge, Cambridge, CB1 8RN, UK
| | | | - John Attia
- Hunter Medical Research Institute, John Hunter Hospital, Newcastle, NSW, 2305, Australia
- Centre for Clinical Epidemiology and Biostatistics, School of Medicine and Public Health, University of Newcastle, NSW, 2305, Australia
| | - Elizabeth G Holliday
- Hunter Medical Research Institute, John Hunter Hospital, Newcastle, NSW, 2305, Australia
- Centre for Clinical Epidemiology and Biostatistics, School of Medicine and Public Health, University of Newcastle, NSW, 2305, Australia
| | - Mark McEvoy
- Centre for Clinical Epidemiology and Biostatistics, School of Medicine and Public Health, University of Newcastle, NSW, 2305, Australia
| | - Rodney J Scott
- Hunter Medical Research Institute, John Hunter Hospital, Newcastle, NSW, 2305, Australia
- Hunter Area Pathology Service, John Hunter Hospital, Newcastle, NSW, 2305, Australia
- Centre for Information Based Medicine, University of Newcastle, NSW, 2308, Australia
- School of Biomedical Sciences and Pharmacy, University of Newcastle, Newcastle, NSW, 2308, Australia
| | - Katie Ashton
- Hunter Medical Research Institute, John Hunter Hospital, Newcastle, NSW, 2305, Australia
- Centre for Information Based Medicine, University of Newcastle, NSW, 2308, Australia
- School of Biomedical Sciences and Pharmacy, University of Newcastle, Newcastle, NSW, 2308, Australia
| | - Tony Proietto
- School of Medicine and Public Health, University of Newcastle, Newcastle, NSW, 2308, Australia
| | - Geoffrey Otton
- School of Medicine and Public Health, University of Newcastle, Newcastle, NSW, 2308, Australia
| | - Mitul Shah
- Centre for Cancer Genetic Epidemiology, Department of Oncology, University of Cambridge, Cambridge, CB1 8RN, UK
| | - Shahana Ahmed
- Centre for Cancer Genetic Epidemiology, Department of Oncology, University of Cambridge, Cambridge, CB1 8RN, UK
| | - Catherine S Healey
- Centre for Cancer Genetic Epidemiology, Department of Oncology, University of Cambridge, Cambridge, CB1 8RN, UK
| | - Maggie Gorman
- Wellcome Trust Centre for Human Genetics, University of Oxford, Oxford, OX3 7BN, UK
| | - Lynn Martin
- Wellcome Trust Centre for Human Genetics, University of Oxford, Oxford, OX3 7BN, UK
| | | | - Shirley Hodgson
- Department of Clinical Genetics, St George’s, University of London, London, SW17 0RE, UK
| | - Peter A Fasching
- University of California at Los Angeles, Department of Medicine, Division of Hematology/Oncology, David Geffen School of Medicine, Los Angeles, CA, 90095, USA
- Department of Gynecology and Obstetrics, University Hospital Erlangen, Friedrich-Alexander University Erlangen-Nuremberg, Erlangen, 91054, Germany
| | - Alexander Hein
- Department of Gynecology and Obstetrics, University Hospital Erlangen, Friedrich-Alexander University Erlangen-Nuremberg, Erlangen, 91054, Germany
| | - Matthias W Beckmann
- Department of Gynecology and Obstetrics, University Hospital Erlangen, Friedrich-Alexander University Erlangen-Nuremberg, Erlangen, 91054, Germany
| | - Arif B Ekici
- Institute of Human Genetics, University Hospital Erlangen, Friedrich-Alexander-University Erlangen-Nuremberg, Erlangen, 91054, Germany
| | - Per Hall
- Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, SE-171 77, Sweden
| | - Kamila Czene
- Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, SE-171 77, Sweden
| | - Hatef Darabi
- Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, SE-171 77, Sweden
| | - Jingmei Li
- Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, SE-171 77, Sweden
| | - Matthias Dürst
- Department of Gynaecology, Jena University Hospital - Friedrich Schiller University, Jena, 07743, Germany
| | - Ingo Runnebaum
- Department of Gynaecology, Jena University Hospital - Friedrich Schiller University, Jena, 07743, Germany
| | - Peter Hillemanns
- Hannover Medical School, Clinics of Gynaecology and Obstetrics, Hannover, 30625, Germany
| | - Thilo Dörk
- Hannover Medical School, Gynaecology Research Unit, Hannover, 30625, Germany
| | - Diether Lambrechts
- Vesalius Research Center, Leuven, 3000, Belgium
- Laboratory for Translational Genetics, Department of Oncology, University Hospitals Leuven, Leuven, 3000, Belgium
| | - Jeroen Depreeuw
- Vesalius Research Center, Leuven, 3000, Belgium
- Laboratory for Translational Genetics, Department of Oncology, University Hospitals Leuven, Leuven, 3000, Belgium
- Department of Obstetrics and Gynecology, Division of Gynecologic Oncology, University Hospitals, KU Leuven - University of Leuven, 3000, Belgium
| | - Daniela Annibali
- Department of Obstetrics and Gynecology, Division of Gynecologic Oncology, University Hospitals, KU Leuven - University of Leuven, 3000, Belgium
| | - Frederic Amant
- Department of Obstetrics and Gynecology, Division of Gynecologic Oncology, University Hospitals, KU Leuven - University of Leuven, 3000, Belgium
| | - Hui Zhao
- Vesalius Research Center, Leuven, 3000, Belgium
- Laboratory for Translational Genetics, Department of Oncology, University Hospitals Leuven, Leuven, 3000, Belgium
| | - Ellen L Goode
- Department of Health Sciences Research, Mayo Clinic, Rochester, MN, 55905, USA
| | - Sean C Dowdy
- Department of Obstetrics and Gynecology, Division of Gynecologic Oncology, Mayo Clinic, Rochester, MN, 55905, USA
| | - Brooke L Fridley
- Department of Biostatistics, University of Kansas Medical Center, Kansas City, KS, 66160, USA
| | - Stacey J Winham
- Department of Health Sciences Research, Mayo Clinic, Rochester, MN, 55905, USA
| | - Helga B Salvesen
- Centre for Cancerbiomarkers, Department of Clinical Science, The University of Bergen, 5020, Norway
- Department of Obstetrics and Gynecology, Haukeland University Hospital, Bergen, 5021, Norway
| | - Tormund S Njølstad
- Centre for Cancerbiomarkers, Department of Clinical Science, The University of Bergen, 5020, Norway
- Department of Obstetrics and Gynecology, Haukeland University Hospital, Bergen, 5021, Norway
| | - Jone Trovik
- Centre for Cancerbiomarkers, Department of Clinical Science, The University of Bergen, 5020, Norway
- Department of Obstetrics and Gynecology, Haukeland University Hospital, Bergen, 5021, Norway
| | - Henrica MJ Werner
- Centre for Cancerbiomarkers, Department of Clinical Science, The University of Bergen, 5020, Norway
- Department of Obstetrics and Gynecology, Haukeland University Hospital, Bergen, 5021, Norway
| | - Emma Tham
- Department of Molecular Medicine and Surgery, Karolinska Institutet, Stockholm, SE-171 77, Sweden
| | - Tao Liu
- Department of Molecular Medicine and Surgery, Karolinska Institutet, Stockholm, SE-171 77, Sweden
| | - Miriam Mints
- Department of Women’s and Children’s Health, Karolinska Institutet, Karolinska University Hospital, Stockholm, SE-171 77, Sweden
| | - RENDOCAS
- Department of Molecular Medicine and Surgery, Karolinska Institutet, Stockholm, SE-171 77, Sweden
- Department of Women’s and Children’s Health, Karolinska Institutet, Karolinska University Hospital, Stockholm, SE-171 77, Sweden
| | - Manjeet K Bolla
- Centre for Cancer Genetic Epidemiology, Department of Public Health and Primary Care, University of Cambridge, Cambridge, CB1 8RN, UK
| | - Kyriaki Michailidou
- Centre for Cancer Genetic Epidemiology, Department of Public Health and Primary Care, University of Cambridge, Cambridge, CB1 8RN, UK
| | - Jonathan P Tyrer
- Centre for Cancer Genetic Epidemiology, Department of Oncology, University of Cambridge, Cambridge, CB1 8RN, UK
| | - Qin Wang
- Centre for Cancer Genetic Epidemiology, Department of Public Health and Primary Care, University of Cambridge, Cambridge, CB1 8RN, UK
| | - John L Hopper
- Centre for Epidemiology and Biostatistics, Melbourne School of Population and Global Health, The University of Melbourne, Vic, 3010, Australia
| | - AOCS Group
- Department of Genetics and Computational Biology, QIMR Berghofer Medical Research Institute, Brisbane, QLD, 4006, Australia
- Peter MacCallum Cancer Center, The University of Melbourne, Melbourne, 3002, Australia
| | - Julian Peto
- London School of Hygiene and Tropical Medicine, London, WC1E 7HT, UK
| | - Anthony J Swerdlow
- Division of Genetics and Epidemiology, Institute of Cancer Research, London, SM2 5NG, UK
- Division of Breast Cancer Research, Institute of Cancer Research, London, SM2 5NG, UK
| | - Barbara Burwinkel
- Molecular Biology of Breast Cancer, Department of Gynecology and Obstetrics, University of Heidelberg, Heidelberg, 69120, Germany
- Division of Cancer Epidemiology, German Cancer Research Center, Heidelberg, 69120, Germany
| | - Hermann Brenner
- Division of Clinical Epidemiology and Aging Research, German Cancer Research Center (DKFZ), Heidelberg, 69120, Germany
- Division of Preventive Oncology, German Cancer Research Center (DKFZ), Heidelberg, 69120, Germany
- German Cancer Consortium (DKTK) and German Cancer Research Center (DKFZ), Heidelberg, 69120, Germany
| | - Alfons Meindl
- Department of Obstetrics and Gynecology, Division of Tumor Genetics, Technical University of Munich, Munich, 80333, Germany
| | - Hiltrud Brauch
- German Cancer Consortium (DKTK) and German Cancer Research Center (DKFZ), Heidelberg, 69120, Germany
- Dr. Margarete Fischer-Bosch-Institute of Clinical Pharmacology, Stuttgart, 70376, Germany
- University of Tübingen, Tübingen, 72074, Germany
| | - Annika Lindblom
- Department of Molecular Medicine and Surgery, Karolinska Institutet, Stockholm, SE-171 77, Sweden
| | - Jenny Chang-Claude
- Division of Cancer Epidemiology, German Cancer Research Center, Heidelberg, 69120, Germany
| | - Fergus J Couch
- Department of Health Sciences Research, Mayo Clinic, Rochester, MN, 55905, USA
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN, 55905, USA
| | - Graham G Giles
- Centre for Epidemiology and Biostatistics, Melbourne School of Population and Global Health, The University of Melbourne, Vic, 3010, Australia
- Cancer Epidemiology Centre, Cancer Council Victoria, Melbourne, Vic, 3004, Australia
- Department of Epidemiology and Preventive Medicine, Monash University, Melbourne, Vic, 3004, Australia
| | - Vessela N Kristensen
- Department of Genetics, Institute for Cancer Research, The Norwegian Radium Hospital, Oslo, 0310, Norway
- The K.G. Jebsen Center for Breast Cancer Research, Institute for Clinical Medicine, Faculty of Medicine, University of Oslo, Oslo, 0316, Norway
- Department of Clinical Molecular Oncology, Division of Medicine, Akershus University Hospital, Lørenskog, 1478, Norway
| | - Angela Cox
- Sheffield Cancer Research, Department of Oncology, University of Sheffield, Sheffield, S10 2RX, UK
| | - Paul D P Pharoah
- Centre for Cancer Genetic Epidemiology, Department of Oncology, University of Cambridge, Cambridge, CB1 8RN, UK
| | - Alison M Dunning
- Centre for Cancer Genetic Epidemiology, Department of Oncology, University of Cambridge, Cambridge, CB1 8RN, UK
| | - Ian Tomlinson
- Wellcome Trust Centre for Human Genetics, University of Oxford, Oxford, OX3 7BN, UK
| | - Douglas F Easton
- Centre for Cancer Genetic Epidemiology, Department of Public Health and Primary Care, University of Cambridge, Cambridge, CB1 8RN, UK
- Centre for Cancer Genetic Epidemiology, Department of Oncology, University of Cambridge, Cambridge, CB1 8RN, UK
| | - Deborah J Thompson
- Centre for Cancer Genetic Epidemiology, Department of Public Health and Primary Care, University of Cambridge, Cambridge, CB1 8RN, UK
| | - Amanda B Spurdle
- Department of Genetics and Computational Biology, QIMR Berghofer Medical Research Institute, Brisbane, QLD, 4006, Australia
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13
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Razafsky D, Hodzic D. A variant of Nesprin1 giant devoid of KASH domain underlies the molecular etiology of autosomal recessive cerebellar ataxia type I. Neurobiol Dis 2015; 78:57-67. [PMID: 25843669 DOI: 10.1016/j.nbd.2015.03.027] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2014] [Revised: 03/24/2015] [Accepted: 03/26/2015] [Indexed: 12/21/2022] Open
Abstract
Nonsense mutations across the whole coding sequence of Syne1/Nesprin1 have been linked to autosomal recessive cerebellar ataxia Type I (ARCA1). However, nothing is known about the molecular etiology of this late-onset debilitating pathology. In this work, we report that Nesprin1 giant is specifically expressed in CNS tissues. We also identified a CNS-specific splicing event that leads to the abundant expression of a KASH-LESS variant of Nesprin1 giant (KLNes1g) in the cerebellum. KLNes1g displayed a noncanonical localization at glomeruli of cerebellar mossy fibers whereas Nesprin2 exclusively decorated the nuclear envelope of all cerebellar neurons. In immunogold electron microscopy, KLNes1g colocalized both with synaptic vesicles within mossy fibers and with dendritic membranes of cerebellar granule neurons. We further identified vesicle- and membrane-associated proteins in KLNes1g immunoprecipitates. Together, our results suggest that the loss of function of KLNes1g resulting from Nesprin1 nonsense mutations underlies the molecular etiology of ARCA1.
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Affiliation(s)
- David Razafsky
- Department of Ophthalmology and Visual Sciences, Washington University School of Medicine, 660 S. Euclid, St Louis, MO 63110, USA
| | - Didier Hodzic
- Department of Ophthalmology and Visual Sciences, Washington University School of Medicine, 660 S. Euclid, St Louis, MO 63110, USA.
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14
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Rajgor D, Mellad JA, Soong D, Rattner JB, Fritzler MJ, Shanahan CM. Mammalian microtubule P-body dynamics are mediated by nesprin-1. ACTA ACUST UNITED AC 2014; 205:457-75. [PMID: 24862572 PMCID: PMC4033771 DOI: 10.1083/jcb.201306076] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Nesprins are a multi-isomeric family of spectrin-repeat (SR) proteins, predominantly known as nuclear envelope scaffolds. However, isoforms that function beyond the nuclear envelope remain poorly examined. Here, we characterize p50(Nesp1), a 50-kD isoform that localizes to processing bodies (PBs), where it acts as a microtubule-associated protein capable of linking mRNP complexes to microtubules. Overexpression of dominant-negative p50(Nesp1) caused Rck/p54, but not GW182, displacement from microtubules, resulting in reduced PB movement and cross talk with stress granules (SGs). These cells disassembled canonical SGs induced by sodium arsenite, but not those induced by hydrogen peroxide, leading to cell death and revealing PB-microtubule attachment is required for hydrogen peroxide-induced SG anti-apoptotic functions. Furthermore, p50(Nesp1) was required for miRNA-mediated silencing and interacted with core miRISC silencers Ago2 and Rck/p54 in an RNA-dependent manner and with GW182 in a microtubule-dependent manner. These data identify p50(Nesp1) as a multi-functional PB component and microtubule scaffold necessary for RNA granule dynamics and provides evidence for PB and SG micro-heterogeneity.
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Affiliation(s)
- Dipen Rajgor
- Cardiovascular Division, BHF Centre of Excellence, James Black Centre, King's College London, London SE5 9NU, England, UK
| | - Jason A Mellad
- Cardiovascular Division, BHF Centre of Excellence, James Black Centre, King's College London, London SE5 9NU, England, UK
| | - Daniel Soong
- Cardiovascular Division, BHF Centre of Excellence, James Black Centre, King's College London, London SE5 9NU, England, UK
| | - Jerome B Rattner
- Department of Biochemistry and Molecular Biology, University of Calgary, Calgary T2N 4N1, Alberta, Canada
| | - Marvin J Fritzler
- Department of Biochemistry and Molecular Biology, University of Calgary, Calgary T2N 4N1, Alberta, Canada
| | - Catherine M Shanahan
- Cardiovascular Division, BHF Centre of Excellence, James Black Centre, King's College London, London SE5 9NU, England, UK
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15
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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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16
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Jevtić P, Levy DL. Mechanisms of nuclear size regulation in model systems and cancer. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2014; 773:537-69. [PMID: 24563365 DOI: 10.1007/978-1-4899-8032-8_25] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Changes in nuclear size have long been used by cytopathologists as an important parameter to diagnose, stage, and prognose many cancers. Mechanisms underlying these changes and functional links between nuclear size and malignancy are largely unknown. Understanding mechanisms of nuclear size regulation and the physiological significance of proper nuclear size control will inform the interplay between altered nuclear size and oncogenesis. In this chapter we review what is known about molecular mechanisms of nuclear size control based on research in model experimental systems including yeast, Xenopus, Tetrahymena, Drosophila, plants, mice, and mammalian cell culture. We discuss how nuclear size is influenced by DNA ploidy, nuclear structural components, cytoplasmic factors and nucleocytoplasmic transport, the cytoskeleton, and the extracellular matrix. Based on these mechanistic insights, we speculate about how nuclear size might impact cell physiology and whether altered nuclear size could contribute to cancer development and progression. We end with some outstanding questions about mechanisms and functions of nuclear size regulation.
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Affiliation(s)
- Predrag Jevtić
- Department of Molecular Biology, University of Wyoming, 1000 E. University Avenue, Laramie, WY, 82071, USA,
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17
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Connecting the nucleus to the cytoskeleton for nuclear positioning and cell migration. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2014; 773:505-20. [PMID: 24563363 DOI: 10.1007/978-1-4899-8032-8_23] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
The position of the nucleus in the cytoplasm is a highly regulated process and is required for multiple cellular and developmental processes. Defects on different nuclear positioning events are associated with several pathologies such as muscle and nervous system disorders. In this chapter we describe the current knowledge on the mechanism of nuclear positioning. We discuss how the nucleus connects to the cytoskeleton by nesprins and SUN proteins, how this connection is regulated by Samp1, and how this connection is required for proper nuclear positioning. Furthermore, we discuss how nesprins, SUN, and Samp1 form transmembrane actin-associated nuclear (TAN) lines, novel nuclear envelope structures involved in force transduction during nuclear movement. Finally, we describe the recent evidences suggesting a role for the connection between the nucleus and the cytoskeleton in cancer.
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18
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Alam S, Lovett DB, Dickinson RB, Roux KJ, Lele TP. Nuclear forces and cell mechanosensing. PROGRESS IN MOLECULAR BIOLOGY AND TRANSLATIONAL SCIENCE 2014; 126:205-15. [PMID: 25081619 DOI: 10.1016/b978-0-12-394624-9.00008-7] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Cells respond to mechanical signals, but the subcellular mechanisms are not well understood. The nucleus has recently emerged as an important mechanosensory organelle in the cell, as it is intimately connected to the cytoskeleton. Mechanical forces applied to cells that act on membrane-embedded receptors are transmitted through the cytoskeleton to the nuclear surface. Interfering with linkers of the nucleus to the cytoskeleton causes defects in cell mechanosensing and cell function. In this chapter, we discuss recent work in this area, highlighting the role that the nuclear linkages with the cytoskeleton play in cellular mechanotransduction.
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Affiliation(s)
- Samer Alam
- Department of Chemical Engineering, University of Florida, Gainesville, Florida, USA
| | - David B Lovett
- Department of Chemical Engineering, University of Florida, Gainesville, Florida, USA
| | - Richard B Dickinson
- Department of Chemical Engineering, University of Florida, Gainesville, Florida, USA
| | - Kyle J Roux
- Sanford Children's Health Research Center, University of South Dakota, Sioux Falls, South Dakota, USA
| | - Tanmay P Lele
- Department of Chemical Engineering, University of Florida, Gainesville, Florida, USA
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19
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Cartwright S, Karakesisoglou I. Nesprins in health and disease. Semin Cell Dev Biol 2013; 29:169-79. [PMID: 24374011 DOI: 10.1016/j.semcdb.2013.12.010] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2013] [Revised: 11/29/2013] [Accepted: 12/15/2013] [Indexed: 01/20/2023]
Abstract
LINC (Linker of Nucleoskeleton and Cytoskeleton) complex is an evolutionary conserved structure that spans the entire nuclear envelope (NE), and integrates the nuclear interior with the cytoskeleton, in order to support a diverse array of fundamental biological processes. Key components of the LINC complex are the nesprins (Nuclear Envelope SPectrin Repeat proteINS) that were initially described as large integral NE proteins. However, nesprin genes are complex and generate many variants, which occupy various sub-cellular compartments suggesting additional functions. Hence, the potential involvement of nesprins in disease has expanded immensely on what we already know. That is, nesprins are implicated in diseases such as cancer, myopathies, arthrogryposis, neurological disorders and hearing loss. Here we review nesprins by providing an in depth account of their structure, molecular interactions and cellular functions with relevance to their potential roles in disease. Specifically, we speculate about possible pathomechanisms underlying nesprin-associated diseases.
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Affiliation(s)
- Sarah Cartwright
- School of Biological and Biomedical Sciences, University of Durham, Durham DH1 3LE, UK
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20
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Abstract
Nuclear envelope
spectrin-repeat
proteins (Nesprins), are a novel family of
nuclear and cytoskeletal proteins with rapidly expanding roles as intracellular scaffolds
and linkers. Originally described as proteins that localise to the nuclear envelope (NE)
and establish nuclear-cytoskeletal connections, nesprins have now been found to comprise a
diverse spectrum of tissue specific isoforms that localise to multiple sub-cellular
compartments. Here, we describe how nesprins are necessary in maintaining cellular
architecture by acting as essential scaffolds and linkers at both the NE and other
sub-cellular domains. More importantly, we speculate how nesprin mutations may disrupt
tissue specific nesprin scaffolds and explain the tissue specific nature of many
nesprin-associated diseases, including laminopathies.
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21
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Vargas JD, Hatch EM, Anderson DJ, Hetzer MW. Transient nuclear envelope rupturing during interphase in human cancer cells. Nucleus 2012; 3:88-100. [PMID: 22567193 DOI: 10.4161/nucl.18954] [Citation(s) in RCA: 184] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
Neoplastic cells are often characterized by specific morphological abnormalities of the nuclear envelope (NE), which have been used for cancer diagnosis for more than a century. The NE is a double phospholipid bilayer that encapsulates the nuclear genome, regulates all nuclear trafficking of RNAs and proteins and prevents the passive diffusion of macromolecules between the nucleoplasm and the cytoplasm. Whether there is a consequence to the proper functioning of the cell and loss of structural integrity of the nucleus remains unclear. Using live cell imaging, we characterize a phenomenon wherein nuclei of several proliferating human cancer cell lines become temporarily ruptured during interphase. Strikingly, NE rupturing was associated with the mislocalization of nucleoplasmic and cytoplasmic proteins and, in the most extreme cases, the entrapment of cytoplasmic organelles in the nuclear interior. In addition, we observed the formation of micronuclei-like structures during interphase and the movement of chromatin out of the nuclear space. The frequency of these NE rupturing events was higher in cells in which the nuclear lamina, a network of intermediate filaments providing mechanical support to the NE, was not properly formed. Our data uncover the existence of a NE instability that has the potential to change the genomic landscape of cancer cells.
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Affiliation(s)
- Jesse D Vargas
- Molecular and Cell Biology Laboratory, Salk Institute for Biological Studies, La Jolla, CA, USA
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22
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Lu W, Schneider M, Neumann S, Jaeger VM, Taranum S, Munck M, Cartwright S, Richardson C, Carthew J, Noh K, Goldberg M, Noegel AA, Karakesisoglou I. Nesprin interchain associations control nuclear size. Cell Mol Life Sci 2012; 69:3493-509. [PMID: 22653047 PMCID: PMC11114684 DOI: 10.1007/s00018-012-1034-1] [Citation(s) in RCA: 73] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2011] [Revised: 04/26/2012] [Accepted: 05/14/2012] [Indexed: 12/12/2022]
Abstract
Nesprins-1/-2/-3/-4 are nuclear envelope proteins, which connect nuclei to the cytoskeleton. The largest nesprin-1/-2 isoforms (termed giant) tether F-actin through their N-terminal actin binding domain (ABD). Nesprin-3, however, lacks an ABD and associates instead to plectin, which binds intermediate filaments. Nesprins are integrated into the outer nuclear membrane via their C-terminal KASH-domain. Here, we show that nesprin-1/-2 ABDs physically and functionally interact with nesprin-3. Thus, both ends of nesprin-1/-2 giant are integrated at the nuclear surface: via the C-terminal KASH-domain and the N-terminal ABD-nesprin-3 association. Interestingly, nesprin-2 ABD or KASH-domain overexpression leads to increased nuclear areas. Conversely, nesprin-2 mini (contains the ABD and KASH-domain but lacks the massive nesprin-2 giant rod segment) expression yields smaller nuclei. Nuclear shrinkage is further enhanced upon nesprin-3 co-expression or microfilament depolymerization. Our findings suggest that multivariate intermolecular nesprin interactions with the cytoskeleton form a lattice-like filamentous network covering the outer nuclear membrane, which determines nuclear size.
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Affiliation(s)
- Wenshu Lu
- School of Biological and Biomedical Sciences, University of Durham, Durham, DH1 3LE UK
- Center for Biochemistry, Medical Faculty, University of Cologne, Joseph-Stelzmann-Strasse 52, 50931 Cologne, Germany
| | - Maria Schneider
- School of Biological and Biomedical Sciences, University of Durham, Durham, DH1 3LE UK
- Center for Biochemistry, Medical Faculty, University of Cologne, Joseph-Stelzmann-Strasse 52, 50931 Cologne, Germany
| | - Sascha Neumann
- Center for Biochemistry, Medical Faculty, University of Cologne, Joseph-Stelzmann-Strasse 52, 50931 Cologne, Germany
| | - Verena-Maren Jaeger
- School of Biological and Biomedical Sciences, University of Durham, Durham, DH1 3LE UK
- Center for Biochemistry, Medical Faculty, University of Cologne, Joseph-Stelzmann-Strasse 52, 50931 Cologne, Germany
| | - Surayya Taranum
- Center for Biochemistry, Medical Faculty, University of Cologne, Joseph-Stelzmann-Strasse 52, 50931 Cologne, Germany
| | - Martina Munck
- Center for Biochemistry, Medical Faculty, University of Cologne, Joseph-Stelzmann-Strasse 52, 50931 Cologne, Germany
| | - Sarah Cartwright
- School of Biological and Biomedical Sciences, University of Durham, Durham, DH1 3LE UK
| | - Christine Richardson
- School of Biological and Biomedical Sciences, University of Durham, Durham, DH1 3LE UK
| | - James Carthew
- School of Biological and Biomedical Sciences, University of Durham, Durham, DH1 3LE UK
| | - Kowoon Noh
- School of Biological and Biomedical Sciences, University of Durham, Durham, DH1 3LE UK
| | - Martin Goldberg
- School of Biological and Biomedical Sciences, University of Durham, Durham, DH1 3LE UK
| | - Angelika A. Noegel
- Center for Biochemistry, Medical Faculty, University of Cologne, Joseph-Stelzmann-Strasse 52, 50931 Cologne, Germany
- Center for Molecular Medicine Cologne, Medical Faculty, University of Cologne, Joseph-Stelzmann-Strasse 52, 50931 Cologne, Germany
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23
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Rothenberg SM, Ellisen LW. The molecular pathogenesis of head and neck squamous cell carcinoma. J Clin Invest 2012; 122:1951-7. [PMID: 22833868 DOI: 10.1172/jci59889] [Citation(s) in RCA: 261] [Impact Index Per Article: 21.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Squamous cell carcinoma of the head and neck (HNSCC) is a relatively common human cancer characterized by high morbidity, high mortality, and few therapeutic options outside of surgery, standard cytotoxic chemotherapy, and radiation. Although the most important risk factors are tobacco use and alcohol consumption, the disease is also linked to infection with high-risk types of human papilloma viruses (HPVs). Recent genetic analyses have yielded new insights into the molecular pathogenesis of this disease. Overall, while somatic activating mutations within classical oncogenes including PIK3CA and RAS occur in HNSCC, they are relatively uncommon. Instead genetic data point to a contribution of multiple tumor suppressor pathways, including p53, Rb/INK4/ARF, and Notch, in tumor initiation, progression, and maintenance. The increasingly refined knowledge of HNSCC genetics, combined with ever-more-sophisticated animal models and newer drug targeting strategies, should promote novel therapeutic approaches and improved disease outcomes.
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Affiliation(s)
- S Michael Rothenberg
- Massachusetts General Hospital Cancer Center and Harvard Medical School, Boston, Massachusetts 02114, USA
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24
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Rajgor D, Mellad JA, Autore F, Zhang Q, Shanahan CM. Multiple novel nesprin-1 and nesprin-2 variants act as versatile tissue-specific intracellular scaffolds. PLoS One 2012; 7:e40098. [PMID: 22768332 PMCID: PMC3388047 DOI: 10.1371/journal.pone.0040098] [Citation(s) in RCA: 86] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2012] [Accepted: 05/31/2012] [Indexed: 12/31/2022] Open
Abstract
BACKGROUND Nesprins (Nuclear envelope spectrin-repeat proteins) are a novel family of giant spectrin-repeat containing proteins. The nesprin-1 and nesprin-2 genes consist of 146 and 116 exons which encode proteins of ∼1mDa and ∼800 kDa is size respectively when all the exons are utilised in translation. However emerging data suggests that the nesprins have multiple alternative start and termination sites throughout their genes allowing the generation of smaller isoforms. RESULTS In this study we set out to identify novel alternatively transcribed nesprin variants by screening the EST database and by using RACE analysis to identify cDNA ends. These two methods provided potential hits for alternative start and termination sites that were validated by PCR and DNA sequencing. We show that these alternative sites are not only expressed in a tissue specific manner but by combining different sites together it is possible to create a wide array of nesprin variants. By cloning and expressing small novel nesprin variants into human fibroblasts and U2OS cells we show localization to actin stress-fibres, focal adhesions, microtubules, the nucleolus, nuclear matrix and the nuclear envelope (NE). Furthermore we show that the sub-cellular localization of individual nesprin variants can vary depending on the cell type, suggesting any single nesprin variant may have different functions in different cell types. CONCLUSIONS These studies suggest nesprins act as highly versatile tissue specific intracellular protein scaffolds and identify potential novel functions for nesprins beyond cytoplasmic-nuclear coupling. These alternate functions may also account for the diverse range of disease phenotypes observed when these genes are mutated.
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Affiliation(s)
- Dipen Rajgor
- Cardiovascular Division, James Black Centre, King’s College London, London, United Kingdom
| | - Jason A. Mellad
- Cardiovascular Division, James Black Centre, King’s College London, London, United Kingdom
| | - Flavia Autore
- The Randall Division of Cell and Molecular Biophysics, New Hunt’s House, King’s College London, London, United Kingdom
| | - Qiuping Zhang
- Cardiovascular Division, James Black Centre, King’s College London, London, United Kingdom
| | - Catherine M. Shanahan
- Cardiovascular Division, James Black Centre, King’s College London, London, United Kingdom
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25
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Cytoskeletal interactions at the nuclear envelope mediated by nesprins. Int J Cell Biol 2012; 2012:736524. [PMID: 22518138 PMCID: PMC3296292 DOI: 10.1155/2012/736524] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2011] [Revised: 10/13/2011] [Accepted: 10/18/2011] [Indexed: 11/29/2022] Open
Abstract
Nesprin-1 is a giant tail-anchored nuclear envelope protein composed of an N-terminal F-actin binding domain, a long linker region formed by multiple spectrin repeats and a C-terminal transmembrane domain. Based on this structure, it connects the nucleus to the actin cytoskeleton. Earlier reports had shown that Nesprin-1 binds to nuclear envelope proteins emerin and lamin through C-terminal spectrin repeats. These repeats can also self-associate. We focus on the N-terminal Nesprin-1 sequences and show that they interact with Nesprin-3, a further member of the Nesprin family, which connects the nucleus to the intermediate filament network. We show that upon ectopic expression of Nesprin-3 in COS7 cells, which are nearly devoid of Nesprin-3 in vitro, vimentin filaments are recruited to the nucleus and provide evidence for an F-actin interaction of Nesprin-3 in vitro. We propose that Nesprins through interactions amongst themselves and amongst the various Nesprins form a network around the nucleus and connect the nucleus to several cytoskeletal networks of the cell.
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26
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Dupin I, Etienne-Manneville S. Nuclear positioning: mechanisms and functions. Int J Biochem Cell Biol 2011; 43:1698-707. [PMID: 21959251 DOI: 10.1016/j.biocel.2011.09.004] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2011] [Revised: 09/10/2011] [Accepted: 09/15/2011] [Indexed: 10/17/2022]
Abstract
The nucleus is the largest organelle in the cell and its position is dynamically controlled in space and time, although the functional significance of this dynamic regulation is not always clear. Nuclear movements are mediated by the cytoskeleton which transmits pushing or pulling forces onto the nuclear envelope. Recent studies have shed light on the mechanisms regulating nuclear positioning inside the cell. While microtubules have been known for a long time to be key players in nuclear positioning, the actin and cytoplasmic intermediate filament cytoskeletons have been implicated in this function more recently and various molecular links between the nuclear envelope and cytoplasmic elements have been identified. In this review, we summarize the recent advances in our understanding of the molecular mechanisms involved in the regulation of nuclear localization in various animal cells and give an overview of the evidence suggesting a crucial role of nuclear positioning in cell polarity and physiology and the consequences of nuclear mispositioning in human pathologies.
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Affiliation(s)
- Isabelle Dupin
- Institut Pasteur, Cell Polarity, Migration and Cancer Unit and CNRS URA 2582, 25 rue du Dr Roux, 75724 Paris Cedex 15, France
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27
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Friedl P, Wolf K, Lammerding J. Nuclear mechanics during cell migration. Curr Opin Cell Biol 2010; 23:55-64. [PMID: 21109415 DOI: 10.1016/j.ceb.2010.10.015] [Citation(s) in RCA: 335] [Impact Index Per Article: 23.9] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2010] [Revised: 10/21/2010] [Accepted: 10/30/2010] [Indexed: 12/30/2022]
Abstract
During cell migration, the movement of the nucleus must be coordinated with the cytoskeletal dynamics at the leading edge and trailing end, and, as a result, undergoes complex changes in position and shape, which in turn affects cell polarity, shape, and migration efficiency. We here describe the steps of nuclear positioning and deformation during cell polarization and migration, focusing on migration through three-dimensional matrices. We discuss molecular components that govern nuclear shape and stiffness, and review how nuclear dynamics are connected to and controlled by the actin, tubulin and intermediate cytoskeleton-based migration machinery and how this regulation is altered in pathological conditions. Understanding the regulation of nuclear biomechanics has important implications for cell migration during tissue regeneration, immune defence and cancer.
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Affiliation(s)
- Peter Friedl
- Department of Cell Biology, Nijmegen Center for Molecular Life Science, Radboud University Nijmegen Medical Centre, P.O. 9101, 6500 HB Nijmegen, The Netherlands.
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28
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Fridolfsson HN, Starr DA. Kinesin-1 and dynein at the nuclear envelope mediate the bidirectional migrations of nuclei. ACTA ACUST UNITED AC 2010; 191:115-28. [PMID: 20921138 PMCID: PMC2953438 DOI: 10.1083/jcb.201004118] [Citation(s) in RCA: 120] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Kinesin-1 and dynein are recruited to the nuclear envelope by the Caenorhabditis elegans klarsicht/ANC-1/Syne homology (KASH) protein UNC-83 to move nuclei. The mechanisms of how these motors are coordinated to mediate nuclear migration are unknown. Time-lapse differential interference contrast and fluorescence imaging of embryonic hypodermal nuclear migration events were used to characterize the kinetics of nuclear migration and determine microtubule dynamics and polarity. Wild-type nuclei display bidirectional movements during migration and are also able to roll past cytoplasmic granules. unc-83, unc-84, and kinesin-1 mutants have severe nuclear migration defects. Without dynein, nuclear migration initiates normally but lacks bidirectional movement and shows defects in nuclear rolling, implicating dynein in resolution of cytoplasmic roadblocks. Microtubules are highly dynamic during nuclear migration. EB1::green fluorescence protein imaging demonstrates that microtubules are polarized in the direction of nuclear migration. This organization of microtubules fits with our model that kinesin-1 moves nuclei forward and dynein functions to move nuclei backward for short stretches to bypass cellular roadblocks.
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Affiliation(s)
- Heidi N Fridolfsson
- Department of Molecular and Cellular Biology, University of California, Davis, Davis, CA 95616, USA
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29
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Starr DA, Fridolfsson HN. Interactions between nuclei and the cytoskeleton are mediated by SUN-KASH nuclear-envelope bridges. Annu Rev Cell Dev Biol 2010; 26:421-44. [PMID: 20507227 DOI: 10.1146/annurev-cellbio-100109-104037] [Citation(s) in RCA: 421] [Impact Index Per Article: 30.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
The nuclear envelope links the cytoskeleton to structural components of the nucleus. It functions to coordinate nuclear migration and anchorage, organize chromatin, and aid meiotic chromosome pairing. Forces generated by the cytoskeleton are transferred across the nuclear envelope to the nuclear lamina through a nuclear-envelope bridge consisting of SUN (Sad1 and UNC-84) and KASH (Klarsicht, ANC-1 and Syne/Nesprin homology) proteins. Some KASH-SUN combinations connect microtubules, centrosomes, actin filaments, or intermediate filaments to the surface of the nucleus. Other combinations are used in cell cycle control, nuclear import, or apoptosis. Interactions between the cytoskeleton and the nucleus also affect global cytoskeleton organization. SUN and KASH proteins were identified through genetic screens for mispositioned nuclei in model organisms. Knockouts of SUN or KASH proteins disrupt neurological and muscular development in mice. Defects in SUN and KASH proteins have been linked to human diseases including muscular dystrophy, ataxia, progeria, lissencephaly, and cancer.
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Affiliation(s)
- Daniel A Starr
- Department of Molecular and Cellular Biology, University of California, Davis, California 95616, USA.
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30
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Doherty JA, Rossing MA, Cushing-Haugen KL, Chen C, Van Den Berg DJ, Wu AH, Pike MC, Ness RB, Moysich K, Chenevix-Trench G, Beesley J, Webb PM, Chang-Claude J, Wang-Gohrke S, Goodman MT, Lurie G, Thompson PJ, Carney ME, Hogdall E, Kjaer SK, Hogdall C, Goode EL, Cunningham JM, Fridley BL, Vierkant RA, Berchuck A, Moorman PG, Schildkraut JM, Palmieri RT, Cramer DW, Terry KL, Yang HP, Garcia-Closas M, Chanock S, Lissowska J, Song H, Pharoah PDP, Shah M, Perkins B, McGuire V, Whittemore AS, Di Cioccio RA, Gentry-Maharaj A, Menon U, Gayther SA, Ramus SJ, Ziogas A, Brewster W, Anton-Culver H, Pearce CL. ESR1/SYNE1 polymorphism and invasive epithelial ovarian cancer risk: an Ovarian Cancer Association Consortium study. Cancer Epidemiol Biomarkers Prev 2010; 19:245-50. [PMID: 20056644 DOI: 10.1158/1055-9965.epi-09-0729] [Citation(s) in RCA: 67] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
We genotyped 13 single nucleotide polymorphisms (SNPs) in the estrogen receptor alpha gene (ESR1) region in three population-based case-control studies of epithelial ovarian cancer conducted in the United States, comprising a total of 1,128 and 1,866 non-Hispanic white invasive cases and controls, respectively. A SNP 19 kb downstream of ESR1 (rs2295190, G-to-T change) was associated with invasive ovarian cancer risk, with a per-T-allele odds ratio (OR) of 1.24 [95% confidence interval (CI), 1.06-1.44, P = 0.006]. rs2295190 is a nonsynonymous coding SNP in a neighboring gene called spectrin repeat containing, nuclear envelope 1 (SYNE1), which is involved in nuclear organization and structural integrity, function of the Golgi apparatus, and cytokinesis. An isoform encoded by SYNE1 has been reported to be downregulated in ovarian and other cancers. rs2295190 was genotyped in an additional 12 studies through the Ovarian Cancer Association Consortium, with 5,279 invasive epithelial cases and 7,450 controls. The per-T-allele OR for this 12-study set was 1.09 (95% CI, 1.02-1.17; P = 0.017). Results for the serous subtype in the 15 combined studies were similar to those overall (n = 3,545; OR, 1.09; 95% CI, 1.01-1.18; P = 0.025), and our findings were strongest for the mucinous subtype (n = 447; OR, 1.32; 95% CI, 1.11-1.58; P = 0.002). No association was observed for the endometrioid subtype. In an additional analysis of 1,459 borderline ovarian cancer cases and 7,370 controls, rs2295190 was not associated with risk. These data provide suggestive evidence that the rs2295190 T allele, or another allele in linkage disequilibrium with it, may be associated with increased risk of invasive ovarian cancer.
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Affiliation(s)
- Jennifer A Doherty
- Program in Epidemiology (M4-C308), Fred Hutchinson Cancer Research Center, PO Box 19024, Seattle, WA 98109-1024, USA.
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