1
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Pfisterer M, Robert R, Saul VV, Pritz A, Seibert M, Feederle R, Schmitz ML. The Aurora B-controlled PP1/RepoMan complex determines the spatial and temporal distribution of mitotic H2B S6 phosphorylation. Open Biol 2024; 14:230460. [PMID: 38806145 DOI: 10.1098/rsob.230460] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2023] [Accepted: 03/19/2024] [Indexed: 05/30/2024] Open
Abstract
The precise spatial and temporal control of histone phosphorylations is important for the ordered progression through the different phases of mitosis. The phosphorylation of H2B at S6 (H2B S6ph), which is crucial for chromosome segregation, reaches its maximum level during metaphase and is limited to the inner centromere. We discovered that the temporal and spatial regulation of this modification, as well as its intensity, are governed by the scaffold protein RepoMan and its associated catalytically active phosphatases, PP1α and PP1γ. Phosphatase activity is inhibited at the area of maximal H2B S6 phosphorylation at the inner centromere by site-specific Aurora B-mediated inactivation of the PP1/RepoMan complex. The motor protein Mklp2 contributes to the relocalization of Aurora B from chromatin to the mitotic spindle during anaphase, thus alleviating Aurora B-dependent repression of the PP1/RepoMan complex and enabling dephosphorylation of H2B S6. Accordingly, dysregulation of Mklp2 levels, as commonly observed in tumour cells, leads to the lack of H2B S6 dephosphorylation during early anaphase, which might contribute to chromosomal instability.
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Affiliation(s)
| | - Roman Robert
- Institute of Biochemistry, Justus-Liebig-University Giessen , Giessen, Germany
| | - Vera V Saul
- Institute of Biochemistry, Justus-Liebig-University Giessen , Giessen, Germany
| | - Amelie Pritz
- Institute of Biochemistry, Justus-Liebig-University Giessen , Giessen, Germany
| | - Markus Seibert
- Institute of Biochemistry, Justus-Liebig-University Giessen , Giessen, Germany
| | - Regina Feederle
- Monoclonal Antibody Core Facility, Helmholtz Center Munich, German Research Center for Environmental Health , Neuherberg, Germany
| | - M Lienhard Schmitz
- Institute of Biochemistry, Justus-Liebig-University Giessen , Giessen, Germany
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2
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Silva GD, Milan TM, Chagas PS, Trevisan GL, Ferraz CL, Leopoldino AM. SET protein as an epigenetics target. Epigenomics 2024; 16:249-257. [PMID: 38131159 DOI: 10.2217/epi-2023-0297] [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] [Indexed: 12/23/2023] Open
Abstract
The SET gene has four transcripts reported in NCBI, coding two isoforms of SET proteins. The most known function of SET protein is inhibiting protein phosphatase 2A, a tumor suppressor, which has been associated with different biological processes. In this review, our focus was on exploring the other SET functions related to epigenetic mechanisms, which impact cellular migration, cell cycle and apoptosis.
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Affiliation(s)
- Gabriel da Silva
- Department of Clinical Analyses, Toxicology & Food Sciences, School of Pharmaceutical Sciences of Ribeirao Preto, University of Sao Paulo, Brazil
| | - Thaís Moré Milan
- Department of Clinical Analyses, Toxicology & Food Sciences, School of Pharmaceutical Sciences of Ribeirao Preto, University of Sao Paulo, Brazil
| | - Pablo Shimaoka Chagas
- Department of Clinical Analyses, Toxicology & Food Sciences, School of Pharmaceutical Sciences of Ribeirao Preto, University of Sao Paulo, Brazil
| | - Glauce Lunardelli Trevisan
- Department of Clinical Analyses, Toxicology & Food Sciences, School of Pharmaceutical Sciences of Ribeirao Preto, University of Sao Paulo, Brazil
| | - Camila Lopes Ferraz
- Department of Clinical Analyses, Toxicology & Food Sciences, School of Pharmaceutical Sciences of Ribeirao Preto, University of Sao Paulo, Brazil
| | - Andréia Machado Leopoldino
- Department of Clinical Analyses, Toxicology & Food Sciences, School of Pharmaceutical Sciences of Ribeirao Preto, University of Sao Paulo, Brazil
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3
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Wang Q, Fang F, Wang Q, Sun L. Capillary zone electrophoresis-high field asymmetric ion mobility spectrometry-tandem mass spectrometry for top-down characterization of histone proteoforms. Proteomics 2024; 24:e2200389. [PMID: 37963825 PMCID: PMC10922523 DOI: 10.1002/pmic.202200389] [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: 04/03/2023] [Revised: 08/14/2023] [Accepted: 10/31/2023] [Indexed: 11/16/2023]
Abstract
Characterization of histone proteoforms with various post-translational modifications (PTMs) is critical for a better understanding of functions of histone proteoforms in epigenetic control of gene expression. Mass spectrometry (MS)-based top-down proteomics (TDP) is a valuable approach for delineating histone proteoforms because it can provide us with a bird's-eye view of histone proteoforms carrying diverse combinations of PTMs. Here, we present the first example of coupling capillary zone electrophoresis (CZE), ion mobility spectrometry (IMS), and MS for online multi-dimensional separations of histone proteoforms. Our CZE-high-field asymmetric waveform IMS (FAIMS)-MS/MS platform identified 366 (ProSight PD) and 602 (TopPIC) histone proteoforms from a commercial calf histone sample using a low microgram amount of histone sample as the starting material. CZE-FAIMS-MS/MS improved the number of histone proteoform identifications by about 3 folds compared to CZE-MS/MS alone (without FAIMS). The results indicate that CZE-FAIMS-MS/MS could be a useful tool for comprehensive characterization of histone proteoforms with high sensitivity.
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Affiliation(s)
- Qianyi Wang
- Department of Chemistry, Michigan State University, East Lansing, Michigan, USA
| | - Fei Fang
- Department of Chemistry, Michigan State University, East Lansing, Michigan, USA
| | - Qianjie Wang
- Department of Chemistry, Michigan State University, East Lansing, Michigan, USA
| | - Liangliang Sun
- Department of Chemistry, Michigan State University, East Lansing, Michigan, USA
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4
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Moreno-Andrés D, Holl K, Antonin W. The second half of mitosis and its implications in cancer biology. Semin Cancer Biol 2023; 88:1-17. [PMID: 36436712 DOI: 10.1016/j.semcancer.2022.11.013] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2022] [Revised: 11/16/2022] [Accepted: 11/21/2022] [Indexed: 11/26/2022]
Abstract
The nucleus undergoes dramatic structural and functional changes during cell division. With the entry into mitosis, in human cells the nuclear envelope breaks down, chromosomes rearrange into rod-like structures which are collected and segregated by the spindle apparatus. While these processes in the first half of mitosis have been intensively studied, much less is known about the second half of mitosis, when a functional nucleus reforms in each of the emerging cells. Here we review our current understanding of mitotic exit and nuclear reformation with spotlights on the links to cancer biology.
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Affiliation(s)
- Daniel Moreno-Andrés
- Institute of Biochemistry and Molecular Cell Biology, Medical School, RWTH Aachen University, Aachen, Germany.
| | - Kristin Holl
- Institute of Biochemistry and Molecular Cell Biology, Medical School, RWTH Aachen University, Aachen, Germany
| | - Wolfram Antonin
- Institute of Biochemistry and Molecular Cell Biology, Medical School, RWTH Aachen University, Aachen, Germany
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5
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Böhly N, Schmidt AK, Zhang X, Slusarenko BO, Hennecke M, Kschischo M, Bastians H. Increased replication origin firing links replication stress to whole chromosomal instability in human cancer. Cell Rep 2022; 41:111836. [PMID: 36516748 DOI: 10.1016/j.celrep.2022.111836] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2021] [Revised: 09/12/2022] [Accepted: 11/22/2022] [Indexed: 12/14/2022] Open
Abstract
Chromosomal instability (CIN) is a hallmark of cancer and comprises structural CIN (S-CIN) and numerical or whole chromosomal CIN (W-CIN). Recent work indicated that replication stress (RS), known to contribute to S-CIN, also affects mitotic chromosome segregation, possibly explaining the common co-existence of S-CIN and W-CIN in human cancer. Here, we show that RS-induced increased origin firing is sufficient to trigger W-CIN in human cancer cells. We discovered that overexpression of origin firing genes, including GINS1 and CDC45, correlates with W-CIN in human cancer specimens and causes W-CIN in otherwise chromosomally stable human cells. Furthermore, modulation of the ATR-CDK1-RIF1 axis increases the number of firing origins and leads to W-CIN. Importantly, chromosome missegregation upon additional origin firing is mediated by increased mitotic microtubule growth rates, a mitotic defect prevalent in chromosomally unstable cancer cells. Thus, our study identifies increased replication origin firing as a cancer-relevant trigger for chromosomal instability.
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Affiliation(s)
- Nicolas Böhly
- Georg August University Göttingen, University Medical Center Göttingen (UMG), Department of Molecular Oncology, Section for Cellular Oncology, 37077 Göttingen, Germany
| | - Ann-Kathrin Schmidt
- Georg August University Göttingen, University Medical Center Göttingen (UMG), Department of Molecular Oncology, Section for Cellular Oncology, 37077 Göttingen, Germany
| | - Xiaoxiao Zhang
- University of Applied Sciences Koblenz, Department of Mathematics and Technology, 53424 Remagen, Germany; Technical University of Munich, Department of Informatics, 81675 Munich, Germany
| | - Benjamin O Slusarenko
- Georg August University Göttingen, University Medical Center Göttingen (UMG), Department of Molecular Oncology, Section for Cellular Oncology, 37077 Göttingen, Germany
| | - Magdalena Hennecke
- Georg August University Göttingen, University Medical Center Göttingen (UMG), Department of Molecular Oncology, Section for Cellular Oncology, 37077 Göttingen, Germany
| | - Maik Kschischo
- University of Applied Sciences Koblenz, Department of Mathematics and Technology, 53424 Remagen, Germany
| | - Holger Bastians
- Georg August University Göttingen, University Medical Center Göttingen (UMG), Department of Molecular Oncology, Section for Cellular Oncology, 37077 Göttingen, Germany.
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6
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Li Q, Demir S, Del Río-Álvarez Á, Maxwell R, Wagner A, Carrillo-Reixach J, Armengol C, Vokuhl C, Häberle B, von Schweinitz D, Schmid I, Cairo S, Kappler R. Targeting the Unwindosome by Mebendazole Is a Vulnerability of Chemoresistant Hepatoblastoma. Cancers (Basel) 2022; 14:cancers14174196. [PMID: 36077733 PMCID: PMC9454988 DOI: 10.3390/cancers14174196] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2022] [Revised: 08/23/2022] [Accepted: 08/26/2022] [Indexed: 11/16/2022] Open
Abstract
Resistance to conventional chemotherapy remains a huge challenge in the clinical management of hepatoblastoma, the most common liver tumor in childhood. By integrating the gene expression data of hepatoblastoma patients into the perturbation prediction tool Connectivity Map, we identified the clinical widely used anthelmintic mebendazole as a drug to circumvent chemoresistance in permanent and patient-derived xenograft cell lines that are resistant to cisplatin, the therapeutic backbone of hepatoblastoma treatment. Viability assays clearly indicated a potent reduction of tumor cell growth upon mebendazole treatment in a dose-dependent manner. The combination of mebendazole and cisplatin revealed a strong synergistic effect, which was comparable to the one seen with cisplatin and doxorubicin, the current treatment for high-risk hepatoblastoma patients. Moreover, mebendazole treatment resulted in reduced colony and tumor spheroid formation capabilities, cell cycle arrest, and induction of apoptosis of hepatoblastoma cells. Mechanistically, mebendazole causes blockage of microtubule formation and transcriptional downregulation of genes encoding the unwindosome, which are highly expressed in chemoresistant tumors. Most importantly, mebendazole significantly reduced tumor growth in a subcutaneous xenograft transplantation mouse model without side effects. In conclusion, our results strongly support the clinical use of mebendazole in the treatment of chemoresistant hepatoblastoma and highlight the potential theranostic value of unwindosome-associated genes.
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Affiliation(s)
- Qian Li
- Department of Pediatric Surgery, Dr. von Hauner Children’s Hospital, University Hospital, LMU Munich, 80337 Munich, Germany
| | - Salih Demir
- Department of Pediatric Surgery, Dr. von Hauner Children’s Hospital, University Hospital, LMU Munich, 80337 Munich, Germany
| | - Álvaro Del Río-Álvarez
- Childhood Liver Oncology Group, Health Sciences Research Institute Germans Trias i Pujol IGTP, 08916 Badalona, Spain
| | - Rebecca Maxwell
- Department of Pediatric Surgery, Dr. von Hauner Children’s Hospital, University Hospital, LMU Munich, 80337 Munich, Germany
| | - Alexandra Wagner
- Department of Pediatric Surgery, Dr. von Hauner Children’s Hospital, University Hospital, LMU Munich, 80337 Munich, Germany
| | - Juan Carrillo-Reixach
- Childhood Liver Oncology Group, Health Sciences Research Institute Germans Trias i Pujol IGTP, 08916 Badalona, Spain
- Liver and Digestive Diseases Networking Biomedical Research Centre (CIBEREHD), 28029 Madrid, Spain
| | - Carolina Armengol
- Childhood Liver Oncology Group, Health Sciences Research Institute Germans Trias i Pujol IGTP, 08916 Badalona, Spain
- Liver and Digestive Diseases Networking Biomedical Research Centre (CIBEREHD), 28029 Madrid, Spain
| | - Christian Vokuhl
- Institute of Pathology, University Hospital Bonn, 53127 Bonn, Germany
| | - Beate Häberle
- Department of Pediatric Surgery, Dr. von Hauner Children’s Hospital, University Hospital, LMU Munich, 80337 Munich, Germany
| | - Dietrich von Schweinitz
- Department of Pediatric Surgery, Dr. von Hauner Children’s Hospital, University Hospital, LMU Munich, 80337 Munich, Germany
| | - Irene Schmid
- Department of Pediatrics, Dr. von Hauner Children’s Hospital, University Hospital, LMU Munich, 80337 Munich, Germany
| | | | - Roland Kappler
- Department of Pediatric Surgery, Dr. von Hauner Children’s Hospital, University Hospital, LMU Munich, 80337 Munich, Germany
- Correspondence: ; Tel.: +49-89-4400-57810
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7
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Bukhari AB, Chan GK, Gamper AM. Targeting the DNA Damage Response for Cancer Therapy by Inhibiting the Kinase Wee1. Front Oncol 2022; 12:828684. [PMID: 35251998 PMCID: PMC8891215 DOI: 10.3389/fonc.2022.828684] [Citation(s) in RCA: 19] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2021] [Accepted: 01/21/2022] [Indexed: 12/15/2022] Open
Abstract
Cancer cells typically heavily rely on the G2/M checkpoint to survive endogenous and exogenous DNA damage, such as genotoxic stress due to genome instability or radiation and chemotherapy. The key regulator of the G2/M checkpoint, the cyclin-dependent kinase 1 (CDK1), is tightly controlled, including by its phosphorylation state. This posttranslational modification, which is determined by the opposing activities of the phosphatase cdc25 and the kinase Wee1, allows for a more rapid response to cellular stress than via the synthesis or degradation of modulatory interacting proteins, such as p21 or cyclin B. Reducing Wee1 activity results in ectopic activation of CDK1 activity and drives premature entry into mitosis with unrepaired or under-replicated DNA and causing mitotic catastrophe. Here, we review efforts to use small molecule inhibitors of Wee1 for therapeutic purposes, including strategies to combine Wee1 inhibition with genotoxic agents, such as radiation therapy or drugs inducing replication stress, or inhibitors of pathways that show synthetic lethality with Wee1. Furthermore, it become increasingly clear that Wee1 inhibition can also modulate therapeutic immune responses. We will discuss the mechanisms underlying combination treatments identifying both cell intrinsic and systemic anti-tumor activities.
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8
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Cai J, Chen J, Huang L, Wang C, Zhang W, Zhou Q, Sun Z. A TIMM17A Regulatory Network Contributing to Breast Cancer. Front Genet 2021; 12:658154. [PMID: 34421983 PMCID: PMC8375323 DOI: 10.3389/fgene.2021.658154] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2021] [Accepted: 06/15/2021] [Indexed: 01/11/2023] Open
Abstract
Background Translocase of inner mitochondrial membrane 17A (TIMM17A) is overexpressed in breast cancer (BRCA), and upregulation can increase the aggressiveness of BRCA cells. This study examined the influence of the TIMM17A gene network on BRCA outcome. Methods Expression levels of TIMM17A were compared between normal and tumor tissues from the OncomineTM database, and the association with patient survival was analyzed using Kaplan–Meier Plotter. Clinical factors influencing TIMM17A expression were studied by UALCAN. cBioPotal was then used to identify genes interacting with TIMM17A, and network relationships were assessed using the R clusterProfiler package. The association between TIMM17A mutation and mRNA expression in BRCA was examined using the LinkFinder application in LinkedOmics, and coexpressed genes were assessed for functional enrichment using the LinkInterpreter application. Furthermore, TIMM17A expression correlation with cell cycle phase distribution was performed by flow cytometry. Finally, the target networks of kinases, microRNAs (miRNAs), and transcription factors were identified using GeneMANIA. The expression and correlation of potential miRNAs and targets were further validated in BRCA cell lines by qRT-PCR. Results Expression of TIMM17A was significantly elevated in BRCA compared with normal tissue (p < 0.05), and overexpression was associated with both poor overall survival (OS) and shorter distant metastasis-free survival (DMFS) (p < 0.05). Expression of TIMM17A was not associated with age, sex, BRCA subclass, clinical stage, or patient ethnicity. The coexpressed TIMM17A network was enriched in genes targeted by cell cycle regulators such as CDK1, miR-331, and E2F family transcription factors (FDR < 0.001). Furthermore, flow cytometry revealed a strong association between higher TIMM17A expression and faster cell cycle progression in these BRCA cell lines. In addition, expression of TIMM17A protein was correlated with CDK1 protein expression in BRCA cell lines as measured by western blotting. Conclusion Elevated TIMM17A expression accelerates the progression of BRCA, thereby reducing OS and DMFS. The TIMM17A-associated networks identified here provide clues to the molecular pathogenesis of BRCA and potential targets for BRCA treatment.
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Affiliation(s)
- Jiajia Cai
- Department of Laboratory Medicine, General Hospital of Southern Theatre Command of PLA, Guangzhou, China
| | - Jianyun Chen
- Department of Laboratory Medicine, General Hospital of Southern Theatre Command of PLA, Guangzhou, China
| | - Ling Huang
- Department of Laboratory Medicine, General Hospital of Southern Theatre Command of PLA, Guangzhou, China.,The First College of Clinical Medical, South Medical University, Guangzhou, China
| | - Changxi Wang
- IT and Cloud Computing Center, Geneplus-Shenzhen, Shenzhen, China
| | - Weiyun Zhang
- Department of Laboratory Medicine, General Hospital of Southern Theatre Command of PLA, Guangzhou, China
| | - Quan Zhou
- Department of Laboratory Medicine, General Hospital of Southern Theatre Command of PLA, Guangzhou, China
| | - Zhaohui Sun
- Department of Laboratory Medicine, General Hospital of Southern Theatre Command of PLA, Guangzhou, China
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9
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Jiang J, Liu B, Liu R, Yang W. Overexpression of Taspase 1 Predicts Poor Prognosis in Patients with Hepatocellular Carcinoma. Cancer Manag Res 2021; 13:2517-2537. [PMID: 33758547 PMCID: PMC7981154 DOI: 10.2147/cmar.s296069] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2020] [Accepted: 02/25/2021] [Indexed: 12/16/2022] Open
Abstract
Background Taspase 1 (TASP1) is a highly conserved protease involved in site-specific proteolysis. Existing researches have revealed a link between TASP1 expression and carcinogenesis. However, limited data are available regarding the prognosis and functions of TASP1 in hepatocellular carcinoma (HCC). Methods Western Blotting and qRT-PCR were employed to evaluate the level of TASP1 in HCC cell lines and clinical specimens. TASP1 expression was further calculated in clinical specimens by immunohistochemistry and the mRNA level of TASP1 in HCC was analyzed using Oncomine and UALCAN databases. The TASP1 promoter methylation modification was shown via MEXPRESS and UALCAN. The association between TASP1 expression and postoperative prognosis was evaluated using Kaplan–Meier and Cox regression analysis in clinical patients. The effect of TASP1 on HCC prognosis was analyzed via Kaplan-Meier plotter, GEPIA and UALCAN. Additionally, the regulators, kinases, miRNA and transcription factor targets of TASP1 were identified using LinkedOmics. Moreover, cBioPortal was used to detect the genetic alteration of TASP1. Finally, TIMER was utilized to assess the relation between TASP1 and the immune cell infiltration, whereas the correlation of TASP1 with three immune factors was detected through TISIDB. Results TASP1 expression was increased in HCC cell lines and HCC tissues. CNV and DNA methylation of TASP1 were changed. Survival analysis revealed that high TASP1 expression was correlated with overall survival (OS). Functional network analysis about TASP1 in HCC showed that the double-strand break repair, peptidyl-threonine modification, spindle organization, peptidyl-lysine modification and microtubule-based movement were modulated. Furthermore, TASP1 expression revealed puissant relation to the infiltration of immune cells and three immune factors in HCC. Conclusion These data indicate that TASP1 may act as a potential prognostic marker in HCC and regulate HCC via multiple mechanisms.
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Affiliation(s)
- Jie Jiang
- Department of Gastroenterology and Hepatology, Shanghai Tongji Hospital, Tongji University School of Medicine, Shanghai, People's Republic of China
| | - Bin Liu
- Department of Gastroenterology, The Fifth Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan, People's Republic of China
| | - Ruilin Liu
- Department of Pulmonary, Shanghai Tongji Hospital, Tongji University School of Medicine, Shanghai, People's Republic of China
| | - Wenzhuo Yang
- Department of Gastroenterology and Hepatology, Shanghai Tongji Hospital, Tongji University School of Medicine, Shanghai, People's Republic of China
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10
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Functioning mechanisms of Shugoshin-1 in centromeric cohesion during mitosis. Essays Biochem 2021; 64:289-297. [PMID: 32451529 DOI: 10.1042/ebc20190077] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2020] [Revised: 04/30/2020] [Accepted: 05/05/2020] [Indexed: 12/15/2022]
Abstract
Proper regulation of centromeric cohesion is required for faithful chromosome segregation that prevents chromosomal instability. Extensive studies have identified and established the conserved protein Shugoshin (Sgo1/2) as an essential protector for centromeric cohesion. In this review, we summarize the current understanding of how Shugoshin-1 (Sgo1) protects centromeric cohesion at the molecular level. Targeting of Sgo1 to inner centromeres is required for its proper function of cohesion protection. We therefore discuss about the molecular mechanisms that install Sgo1 onto inner centromeres. At metaphase-to-anaphase transition, Sgo1 at inner centromeres needs to be disabled for the subsequent sister-chromatid segregation. A few recent studies suggest interesting models to explain how it is achieved. These models are discussed as well.
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11
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Watson NA, Cartwright TN, Lawless C, Cámara-Donoso M, Sen O, Sako K, Hirota T, Kimura H, Higgins JMG. Kinase inhibition profiles as a tool to identify kinases for specific phosphorylation sites. Nat Commun 2020; 11:1684. [PMID: 32245944 PMCID: PMC7125195 DOI: 10.1038/s41467-020-15428-0] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2019] [Accepted: 03/06/2020] [Indexed: 01/08/2023] Open
Abstract
There are thousands of known cellular phosphorylation sites, but the paucity of ways to identify kinases for particular phosphorylation events remains a major roadblock for understanding kinase signaling. To address this, we here develop a generally applicable method that exploits the large number of kinase inhibitors that have been profiled on near-kinome-wide panels of protein kinases. The inhibition profile for each kinase provides a fingerprint that allows identification of unknown kinases acting on target phosphosites in cell extracts. We validate the method on diverse known kinase-phosphosite pairs, including histone kinases, EGFR autophosphorylation, and Integrin β1 phosphorylation by Src-family kinases. We also use our approach to identify the previously unknown kinases responsible for phosphorylation of INCENP at a site within a commonly phosphorylated motif in mitosis (a non-canonical target of Cyclin B-Cdk1), and of BCL9L at S915 (PKA). We show that the method has clear advantages over in silico and genetic screening.
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Affiliation(s)
- Nikolaus A Watson
- Biosciences Institute, Faculty of Medical Sciences, Newcastle University, Newcastle upon Tyne, NE2 4HH, UK
| | - Tyrell N Cartwright
- Biosciences Institute, Faculty of Medical Sciences, Newcastle University, Newcastle upon Tyne, NE2 4HH, UK
| | - Conor Lawless
- Wellcome Centre for Mitochondrial Research, Faculty of Medical Sciences, Newcastle University, Newcastle upon Tyne, NE2 4HH, UK
| | - Marcos Cámara-Donoso
- Biosciences Institute, Faculty of Medical Sciences, Newcastle University, Newcastle upon Tyne, NE2 4HH, UK
| | - Onur Sen
- Biosciences Institute, Faculty of Medical Sciences, Newcastle University, Newcastle upon Tyne, NE2 4HH, UK
| | - Kosuke Sako
- The Cancer Institute, Japanese Foundation for Cancer Research, Koto, Tokyo, 135-8550, Japan
| | - Toru Hirota
- The Cancer Institute, Japanese Foundation for Cancer Research, Koto, Tokyo, 135-8550, Japan
| | - Hiroshi Kimura
- Cell Biology Center, Institute of Innovative Research, Tokyo Institute of Technology, Yokohama, Kanagawa, 226-8503, Japan
| | - Jonathan M G Higgins
- Biosciences Institute, Faculty of Medical Sciences, Newcastle University, Newcastle upon Tyne, NE2 4HH, UK.
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12
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Michowski W, Chick JM, Chu C, Kolodziejczyk A, Wang Y, Suski JM, Abraham B, Anders L, Day D, Dunkl LM, Li Cheong Man M, Zhang T, Laphanuwat P, Bacon NA, Liu L, Fassl A, Sharma S, Otto T, Jecrois E, Han R, Sweeney KE, Marro S, Wernig M, Geng Y, Moses A, Li C, Gygi SP, Young RA, Sicinski P. Cdk1 Controls Global Epigenetic Landscape in Embryonic Stem Cells. Mol Cell 2020; 78:459-476.e13. [PMID: 32240602 DOI: 10.1016/j.molcel.2020.03.010] [Citation(s) in RCA: 60] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2019] [Revised: 01/26/2020] [Accepted: 03/08/2020] [Indexed: 12/13/2022]
Abstract
The cyclin-dependent kinase 1 (Cdk1) drives cell division. To uncover additional functions of Cdk1, we generated knockin mice expressing an analog-sensitive version of Cdk1 in place of wild-type Cdk1. In our study, we focused on embryonic stem cells (ESCs), because this cell type displays particularly high Cdk1 activity. We found that in ESCs, a large fraction of Cdk1 substrates is localized on chromatin. Cdk1 phosphorylates many proteins involved in epigenetic regulation, including writers and erasers of all major histone marks. Consistent with these findings, inhibition of Cdk1 altered histone-modification status of ESCs. High levels of Cdk1 in ESCs phosphorylate and partially inactivate Dot1l, the H3K79 methyltransferase responsible for placing activating marks on gene bodies. Decrease of Cdk1 activity during ESC differentiation de-represses Dot1l, thereby allowing coordinated expression of differentiation genes. These analyses indicate that Cdk1 functions to maintain the epigenetic identity of ESCs.
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Affiliation(s)
- Wojciech Michowski
- Department of Cancer Biology, Dana-Farber Cancer Institute, Boston, MA 02215, USA; Department of Genetics, Blavatnik Institute, Harvard Medical School, Boston, MA 02115, USA; Department of Oncologic Pathology, Dana-Farber Cancer Institute, Boston, MA 02215, USA
| | - Joel M Chick
- Department of Cell Biology, Harvard Medical School, Boston, MA 02115, USA
| | - Chen Chu
- Department of Cancer Biology, Dana-Farber Cancer Institute, Boston, MA 02215, USA; Department of Genetics, Blavatnik Institute, Harvard Medical School, Boston, MA 02115, USA
| | - Aleksandra Kolodziejczyk
- Department of Cancer Biology, Dana-Farber Cancer Institute, Boston, MA 02215, USA; Department of Genetics, Blavatnik Institute, Harvard Medical School, Boston, MA 02115, USA
| | - Yichen Wang
- School of Life Sciences, Peking University, Beijing 100871, China
| | - Jan M Suski
- Department of Cancer Biology, Dana-Farber Cancer Institute, Boston, MA 02215, USA; Department of Genetics, Blavatnik Institute, Harvard Medical School, Boston, MA 02115, USA
| | - Brian Abraham
- Whitehead Institute for Biomedical Research, Cambridge, MA 02142, USA; Department of Biology, Massachusetts Institute of Technology, Cambridge, MA 02142, USA
| | - Lars Anders
- Whitehead Institute for Biomedical Research, Cambridge, MA 02142, USA; Department of Biology, Massachusetts Institute of Technology, Cambridge, MA 02142, USA
| | - Daniel Day
- Whitehead Institute for Biomedical Research, Cambridge, MA 02142, USA; Department of Biology, Massachusetts Institute of Technology, Cambridge, MA 02142, USA
| | - Lukas M Dunkl
- Department of Cancer Biology, Dana-Farber Cancer Institute, Boston, MA 02215, USA; Department of Genetics, Blavatnik Institute, Harvard Medical School, Boston, MA 02115, USA
| | - Mitchell Li Cheong Man
- Department of Cell and Systems Biology, University of Toronto, Toronto, ON M5S 3B2, Canada
| | - Tian Zhang
- Department of Cell Biology, Harvard Medical School, Boston, MA 02115, USA
| | - Phatthamon Laphanuwat
- Department of Cancer Biology, Dana-Farber Cancer Institute, Boston, MA 02215, USA; Department of Genetics, Blavatnik Institute, Harvard Medical School, Boston, MA 02115, USA
| | - Nickolas A Bacon
- Department of Cancer Biology, Dana-Farber Cancer Institute, Boston, MA 02215, USA; Department of Genetics, Blavatnik Institute, Harvard Medical School, Boston, MA 02115, USA
| | - Lijun Liu
- Department of Cancer Biology, Dana-Farber Cancer Institute, Boston, MA 02215, USA; Department of Genetics, Blavatnik Institute, Harvard Medical School, Boston, MA 02115, USA
| | - Anne Fassl
- Department of Cancer Biology, Dana-Farber Cancer Institute, Boston, MA 02215, USA; Department of Genetics, Blavatnik Institute, Harvard Medical School, Boston, MA 02115, USA
| | - Samanta Sharma
- Department of Cancer Biology, Dana-Farber Cancer Institute, Boston, MA 02215, USA; Department of Genetics, Blavatnik Institute, Harvard Medical School, Boston, MA 02115, USA
| | - Tobias Otto
- Department of Cancer Biology, Dana-Farber Cancer Institute, Boston, MA 02215, USA; Department of Genetics, Blavatnik Institute, Harvard Medical School, Boston, MA 02115, USA
| | - Emanuelle Jecrois
- Department of Cancer Biology, Dana-Farber Cancer Institute, Boston, MA 02215, USA; Department of Genetics, Blavatnik Institute, Harvard Medical School, Boston, MA 02115, USA
| | - Richard Han
- Department of Cancer Biology, Dana-Farber Cancer Institute, Boston, MA 02215, USA; Department of Genetics, Blavatnik Institute, Harvard Medical School, Boston, MA 02115, USA
| | - Katharine E Sweeney
- Department of Cancer Biology, Dana-Farber Cancer Institute, Boston, MA 02215, USA; Department of Genetics, Blavatnik Institute, Harvard Medical School, Boston, MA 02115, USA
| | - Samuele Marro
- Institute for Stem Cell Biology and Regenerative Medicine and Department of Pathology, Stanford University Medical School, Stanford, CA 94305, USA
| | - Marius Wernig
- Institute for Stem Cell Biology and Regenerative Medicine and Department of Pathology, Stanford University Medical School, Stanford, CA 94305, USA
| | - Yan Geng
- Department of Cancer Biology, Dana-Farber Cancer Institute, Boston, MA 02215, USA; Department of Genetics, Blavatnik Institute, Harvard Medical School, Boston, MA 02115, USA
| | - Alan Moses
- Department of Cell and Systems Biology, University of Toronto, Toronto, ON M5S 3B2, Canada; Center for Analysis of Genome Evolution and Function, Toronto, ON M5S 3B2, Canada
| | - Cheng Li
- School of Life Sciences, Peking University, Beijing 100871, China
| | - Steven P Gygi
- Department of Cell Biology, Harvard Medical School, Boston, MA 02115, USA
| | - Richard A Young
- Whitehead Institute for Biomedical Research, Cambridge, MA 02142, USA; Department of Biology, Massachusetts Institute of Technology, Cambridge, MA 02142, USA
| | - Piotr Sicinski
- Department of Cancer Biology, Dana-Farber Cancer Institute, Boston, MA 02215, USA; Department of Genetics, Blavatnik Institute, Harvard Medical School, Boston, MA 02115, USA.
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13
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SIAH2-mediated and organ-specific restriction of HO-1 expression by a dual mechanism. Sci Rep 2020; 10:2268. [PMID: 32042051 PMCID: PMC7010731 DOI: 10.1038/s41598-020-59005-3] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2019] [Accepted: 01/22/2020] [Indexed: 12/11/2022] Open
Abstract
The intracellular levels of the cytoprotective enzyme heme oxygenase-1 (HO-1) are tightly controlled. Here, we reveal a novel mechanism preventing the exaggerated expression of HO-1. The analysis of mice with a knock-out in the ubiquitin E3 ligase seven in absentia homolog 2 (SIAH2) showed elevated HO-1 protein levels in specific organs such as heart, kidney and skeletal muscle. Increased HO-1 protein amounts were also seen in human cells deleted for the SIAH2 gene. The higher HO-1 levels are not only due to an increased protein stability but also to elevated expression of the HO-1 encoding HMOX1 gene, which depends on the transcription factor nuclear factor E2-related factor 2 (NRF2), a known SIAH2 target. Dependent on its RING (really interesting new gene) domain, expression of SIAH2 mediates proteasome-dependent degradation of its interaction partner HO-1. Additionally SIAH2-deficient cells are also characterized by reduced expression levels of glutathione peroxidase 4 (GPX4), rendering the knock-out cells more sensitive to ferroptosis.
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14
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Schmitz ML, Higgins JMG, Seibert M. Priming chromatin for segregation: functional roles of mitotic histone modifications. Cell Cycle 2020; 19:625-641. [PMID: 31992120 DOI: 10.1080/15384101.2020.1719585] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Posttranslational modifications (PTMs) of histone proteins are important for various cellular processes including regulation of gene expression and chromatin structure, DNA damage response and chromosome segregation. Here we comprehensively review mitotic histone PTMs, in particular phosphorylations, and discuss their interplay and functions in the control of dynamic protein-protein interactions as well as their contribution to centromere and chromosome structure and function during cell division. Histone phosphorylations can create binding sites for mitotic regulators such as the chromosomal passenger complex, which is required for correction of erroneous spindle attachments and chromosome bi-orientation. Other histone PTMs can alter the structural properties of nucleosomes and the accessibility of chromatin. Epigenetic marks such as lysine methylations are maintained during mitosis and may also be important for mitotic transcription as well as bookmarking of transcriptional states to ensure the transmission of gene expression programs through cell division. Additionally, histone phosphorylation can dissociate readers of methylated histones without losing epigenetic information. Through all of these processes, mitotic histone PTMs play a functional role in priming the chromatin for faithful chromosome segregation and preventing genetic instability, one of the characteristic hallmarks of cancer cells.
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Affiliation(s)
- M Lienhard Schmitz
- Institute of Biochemistry, Medical Faculty, Member of the German Center for Lung Research, Justus-Liebig-University, Giessen, Germany
| | - Jonathan M G Higgins
- Biosciences Institute, Faculty of Medical Sciences, Newcastle University, Newcastle upon Tyne, UK
| | - Markus Seibert
- Institute of Biochemistry, Medical Faculty, Member of the German Center for Lung Research, Justus-Liebig-University, Giessen, Germany
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15
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Duforestel M, Briand J, Bougras-Cartron G, Heymann D, Frenel JS, Vallette FM, Cartron PF. Cell-free circulating epimarks in cancer monitoring. Epigenomics 2020; 12:145-155. [DOI: 10.2217/epi-2019-0170] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Cancer numbers increasing, cases heterogeneity and the drug resistance emergence have pushed scientists to search for innovative solutions for patients and epimutations can be one. Methylated DNA, modified nucleosomes and noncoding RNAs are found in all cells, including tumor cells. They are intracellular actors but also have intercellular communication roles, being released in extracellular environment and in different body fluids. Here, we reviewed current literature on the use of these blood circulating epimarks in cancer monitoring. What stands out is that epimarkers must be considered as ‘real time’ images of the tumor, and can be isolated without invasive methods. In the future, the real challenge lies in the development of specific, sensitive, fast and clinically applicable detection and analysis methods of epimarkers.
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Affiliation(s)
- Manon Duforestel
- CRCINA, INSERM, Université de Nantes, Nantes, France
- Equipe Apoptose et Progression tumorale, LaBCT, Institut de Cancérologie de l'Ouest, Saint Herblain, France
- Niches & Epigenetics of Tumors Network from Cancéropôle Grand Ouest
- EpiSAVMEN Network (Région Pays de la Loire)
| | - Joséphine Briand
- CRCINA, INSERM, Université de Nantes, Nantes, France
- Equipe Apoptose et Progression tumorale, LaBCT, Institut de Cancérologie de l'Ouest, Saint Herblain, France
- Niches & Epigenetics of Tumors Network from Cancéropôle Grand Ouest
- EpiSAVMEN Network (Région Pays de la Loire)
| | - Gwenola Bougras-Cartron
- CRCINA, INSERM, Université de Nantes, Nantes, France
- Equipe Apoptose et Progression tumorale, LaBCT, Institut de Cancérologie de l'Ouest, Saint Herblain, France
- Niches & Epigenetics of Tumors Network from Cancéropôle Grand Ouest
- EpiSAVMEN Network (Région Pays de la Loire)
| | - Dominique Heymann
- CRCINA, INSERM, Université de Nantes, Nantes, France
- Equipe Apoptose et Progression tumorale, LaBCT, Institut de Cancérologie de l'Ouest, Saint Herblain, France
| | - Jean-Sébastien Frenel
- CRCINA, INSERM, Université de Nantes, Nantes, France
- Equipe Apoptose et Progression tumorale, LaBCT, Institut de Cancérologie de l'Ouest, Saint Herblain, France
- Niches & Epigenetics of Tumors Network from Cancéropôle Grand Ouest
- EpiSAVMEN Network (Région Pays de la Loire)
- Department of Medical Oncology, Institut de Cancérologie de l'Ouest Site René Gauducheau, Saint Herblain, France
| | - François M Vallette
- CRCINA, INSERM, Université de Nantes, Nantes, France
- Equipe Apoptose et Progression tumorale, LaBCT, Institut de Cancérologie de l'Ouest, Saint Herblain, France
- Niches & Epigenetics of Tumors Network from Cancéropôle Grand Ouest
- EpiSAVMEN Network (Région Pays de la Loire)
- LabEX IGO, Université de Nantes, France
| | - Pierre-François Cartron
- CRCINA, INSERM, Université de Nantes, Nantes, France
- Equipe Apoptose et Progression tumorale, LaBCT, Institut de Cancérologie de l'Ouest, Saint Herblain, France
- Niches & Epigenetics of Tumors Network from Cancéropôle Grand Ouest
- EpiSAVMEN Network (Région Pays de la Loire)
- LabEX IGO, Université de Nantes, France
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16
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Qu Q, Zhang Q, Yang L, Chen Y, Liu H. SET binding to Sgo1 inhibits Sgo1-cohesin interactions and promotes chromosome segregation. J Cell Biol 2019; 218:2514-2528. [PMID: 31227592 PMCID: PMC6683731 DOI: 10.1083/jcb.201810096] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2018] [Revised: 03/29/2019] [Accepted: 05/15/2019] [Indexed: 12/28/2022] Open
Abstract
At anaphase onset, Sgo1 function of cohesion protection must be disabled to allow timely chromosome segregation, but how this is achieved is not fully understood. Here, we show that SET, a known PP2A inhibitor, directly binds to a domain in Sgo1 in close proximity to the cohesin-binding motif. The Sgo1-cohesin binding can be disrupted by SET in a dose-dependent manner in vitro as well as by SET overexpression in cells, suggesting that SET is also an inhibitor to the Sgo1-cohesin binding. Furthermore, the SET binding-deficient Sgo1 mutant fully supports centromeric cohesion protection but delays chromosome segregation, suggesting that the SET-Sgo1 binding is required for timely chromosome segregation. Moreover, overexpression of SET WT, not the Sgo1 binding-deficient mutant, exacerbates the occurrence of cohesion fatigue in MG132-arrested cells. Conversely, SET depletion delays it. Thus, we propose that a major function of SET during mitosis is to disrupt the Sgo1-cohesin interaction, thereby promoting centromeric cohesion de-protection and timely chromosome segregation at anaphase onset.
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Affiliation(s)
- Qianhui Qu
- Department of Pharmacology, University of Texas Southwestern Medical Center, Dallas, TX
| | - Qian Zhang
- Department of Biochemistry and Molecular Biology and Tulane Aging Center, Tulane University Health Science Center, New Orleans, LA
| | - Lu Yang
- Department of Biochemistry and Molecular Biology and Tulane Aging Center, Tulane University Health Science Center, New Orleans, LA
| | - Yujue Chen
- Department of Biochemistry and Molecular Biology and Tulane Aging Center, Tulane University Health Science Center, New Orleans, LA
| | - Hong Liu
- Department of Biochemistry and Molecular Biology and Tulane Aging Center, Tulane University Health Science Center, New Orleans, LA
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17
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Abstract
A complex network precisely regulates the cell cycle through the G1, S, G2, and M phases and is the basis for cell division under physiological and pathological conditions. On the one hand, the transition from one phase to another as well as the progression within each phase is driven by the specific cyclin-dependent kinases (CDKs; e.g., CDK1, CDK2, CDK4, CDK6, and CDK7), together with their exclusive partner cyclins (e.g., cyclin A1, B1, D1–3, and E1). On the other hand, these phases are negatively regulated by endogenous CDK inhibitors such as p16ink4a, p18ink4c, p19ink4d, p21cip1, and p27kip1. In addition, several checkpoints control the commitment of cells to replicate DNA and undergo mitosis, thereby avoiding the passage of genomic errors to daughter cells. CDKs are often constitutively activated in cancer, which is characterized by the uncontrolled proliferation of transformed cells, due to genetic and epigenetic abnormalities in the genes involved in the cell cycle. Moreover, several oncogenes and defective tumor suppressors promote malignant changes by stimulating cell cycle entry and progression or disrupting DNA damage responses, including the cell cycle checkpoints, DNA repair mechanisms, and apoptosis. Thus, genes or proteins related to cell cycle regulation remain the main targets of interest in the treatment of various cancer types, including hematologic malignancies. In this context, advances in the understanding of the cell cycle regulatory machinery provide a basis for the development of novel therapeutic approaches. The present article summarizes the pathways as well as their genetic and epigenetic alterations that regulate the cell cycle; moreover, it discusses the various approved or potential therapeutic targets associated with the cell cycle, focusing on hematologic malignancies.
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18
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Kim JE. Bookmarking by histone methylation ensures chromosomal integrity during mitosis. Arch Pharm Res 2019; 42:466-480. [PMID: 31020544 DOI: 10.1007/s12272-019-01156-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2019] [Accepted: 04/19/2019] [Indexed: 12/22/2022]
Abstract
The cell cycle is an orchestrated process that replicates DNA and transmits genetic information to daughter cells. Cell cycle progression is governed by diverse histone modifications that control gene transcription in a timely fashion. Histone modifications also regulate cell cycle progression by marking specific chromatic regions. While many reviews have covered histone phosphorylation and acetylation as regulators of the cell cycle, little attention has been paid to the roles of histone methylation in the faithful progression of mitosis. Indeed, specific histone methylations occurring before, during, or after mitosis affect kinetochore assembly and chromosome condensation and segregation. In addition to timing, histone methylations specify the chromatin regions such as chromosome arms, pericentromere, and centromere. Therefore, spatiotemporal programming of histone methylations ensures epigenetic inheritance through mitosis. This review mainly discusses histone methylations and their relevance to mitotic progression.
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Affiliation(s)
- Ja-Eun Kim
- Department of Pharmacology, School of Medicine, Kyung Hee University, Seoul, 02447, Republic of Korea.
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19
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Quantitative Phosphoproteomic and Physiological Analyses Provide Insights into the Formation of the Variegated Leaf in Catalpa fargesii. Int J Mol Sci 2019; 20:ijms20081895. [PMID: 30999580 PMCID: PMC6514904 DOI: 10.3390/ijms20081895] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2019] [Revised: 04/11/2019] [Accepted: 04/11/2019] [Indexed: 12/29/2022] Open
Abstract
Variegated plants are valuable materials for investigating leaf color regulated mechanisms. To unveil the role of posttranslational modification in the variegated phenotype, we conducted global quantitative phosphoproteomic analysis on different leaf color sectors of Maiyuanjinqiu and the corresponding of Catalpa fargesii using Ti4+-IMAC phosphopeptide enrichment. A total of 3778 phosphorylated sites assigned to 1646 phosphoproteins were identified, and 3221 in 1434 proteins were quantified. Differential phosphoproteins (above 1.5 or below 1/1.5) in various leaf color sectors were selected for functional enrichment analyses. Gene ontology (GO) enrichment revealed that processes of photosynthesis, regulation of the generation of precursor metabolites, response to stress, homeostasis, amino acid metabolism, transport–related processes, and most of the energy metabolisms might contribute to leaf color. KEGG pathway enrichment analysis was performed based on differential phosphoproteins (DPs) in different organelles. The result showed that most enriched pathways were located in the chloroplasts and cytosol. The phosphorylation levels of glycometabolism enzymes might greatly affect leaf variegation. Measurements of fluorescence parameters and enzyme activities confirmed that protein phosphorylation could affect plant physiology by regulating enzyme activity. These results provide new clues for further study the formation mechanisms of naturally variegated phenotype.
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