1
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YAMAMOTO M, FUJIWARA N. Protein phosphatase 6 regulates trametinib sensitivity, a mitogen-activated protein kinase kinase (MEK) inhibitor, by regulating MEK1/2-ERK1/2 signaling in canine melanoma cells. J Vet Med Sci 2023; 85:977-984. [PMID: 37495516 PMCID: PMC10539826 DOI: 10.1292/jvms.23-0274] [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: 06/26/2023] [Accepted: 07/17/2023] [Indexed: 07/28/2023] Open
Abstract
Melanoma is a highly aggressive and metastatic cancer occurring in both humans and dogs. Canine melanoma accounts for a significant proportion of neoplastic diseases in dogs, and despite standard treatments, overall survival rates remain low. Protein phosphatase 6 (PP6), an evolutionarily conserved serine/threonine protein phosphatase, regulates various biological processes. Additionally, the loss of PP6 function reportedly leads to the development of melanoma in humans. However, there are no reports regarding the role of PP6 in canine cancer cells. We, therefore, conducted a study investigating the role of PP6 in canine melanoma by using four canine melanoma cell lines: CMec1, CMM, KMeC and LMeC. PP6 knockdown increased phosphorylation levels of mitogen-activated protein kinase kinase 1/2 (MEK1/2) and extracellular signal-regulated kinase 1/2 (ERK1/2) but not Akt. Furthermore, PP6 knockdown decreased sensitivity to trametinib, a MEK inhibitor, but did not alter sensitivity to Akt inhibitor. These findings suggest that PP6 may function as a tumor suppressor in canine melanoma and modulate the response to trametinib treatment. Understanding the role of PP6 in canine melanoma could lead to the development of more effective treatment strategies for this aggressive disease.
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Affiliation(s)
- Miu YAMAMOTO
- Laboratory of Drug Discovery and Pharmacology, Faculty of Veterinary Medicine, Okayama University of Science, Ehime, Japan
| | - Nobuyuki FUJIWARA
- Laboratory of Drug Discovery and Pharmacology, Faculty of Veterinary Medicine, Okayama University of Science, Ehime, Japan
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2
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Sobajima T, Kowalczyk KM, Skylakakis S, Hayward D, Fulcher LJ, Neary C, Batley C, Kurlekar S, Roberts E, Gruneberg U, Barr FA. PP6 regulation of Aurora A-TPX2 limits NDC80 phosphorylation and mitotic spindle size. J Cell Biol 2023; 222:e202205117. [PMID: 36897279 PMCID: PMC10041653 DOI: 10.1083/jcb.202205117] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2022] [Revised: 11/22/2022] [Accepted: 02/10/2023] [Indexed: 03/11/2023] Open
Abstract
Amplification of the mitotic kinase Aurora A or loss of its regulator protein phosphatase 6 (PP6) have emerged as drivers of genome instability. Cells lacking PPP6C, the catalytic subunit of PP6, have amplified Aurora A activity, and as we show here, enlarged mitotic spindles which fail to hold chromosomes tightly together in anaphase, causing defective nuclear structure. Using functional genomics to shed light on the processes underpinning these changes, we discover synthetic lethality between PPP6C and the kinetochore protein NDC80. We find that NDC80 is phosphorylated on multiple N-terminal sites during spindle formation by Aurora A-TPX2, exclusively at checkpoint-silenced, microtubule-attached kinetochores. NDC80 phosphorylation persists until spindle disassembly in telophase, is increased in PPP6C knockout cells, and is Aurora B-independent. An Aurora-phosphorylation-deficient NDC80-9A mutant reduces spindle size and suppresses defective nuclear structure in PPP6C knockout cells. In regulating NDC80 phosphorylation by Aurora A-TPX2, PP6 plays an important role in mitotic spindle formation and size control and thus the fidelity of cell division.
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Affiliation(s)
| | | | | | - Daniel Hayward
- Sir William Dunn School of Pathology, University of Oxford, Oxford, UK
- Randall Centre for Cell and Molecular Biophysics, King’s College London, London, UK
| | - Luke J. Fulcher
- Department of Biochemistry, University of Oxford, Oxford, UK
| | - Colette Neary
- Department of Biochemistry, University of Oxford, Oxford, UK
| | - Caleb Batley
- Department of Biochemistry, University of Oxford, Oxford, UK
| | - Samvid Kurlekar
- Department of Biochemistry, University of Oxford, Oxford, UK
| | - Emile Roberts
- Sir William Dunn School of Pathology, University of Oxford, Oxford, UK
| | - Ulrike Gruneberg
- Sir William Dunn School of Pathology, University of Oxford, Oxford, UK
| | - Francis A. Barr
- Department of Biochemistry, University of Oxford, Oxford, UK
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3
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Mariano NC, Rusin SF, Nasa I, Kettenbach AN. Inducible protein degradation as a strategy to identify Phosphoprotein Phosphatase 6 substrates in RAS-mutant colorectal cancer cells. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.03.25.534211. [PMID: 36993243 PMCID: PMC10055397 DOI: 10.1101/2023.03.25.534211] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 04/13/2023]
Abstract
Protein phosphorylation is an essential regulatory mechanism that controls most cellular processes, including cell cycle progression, cell division, and response to extracellular stimuli, among many others, and is deregulated in many diseases. Protein phosphorylation is coordinated by the opposing activities of protein kinases and protein phosphatases. In eukaryotic cells, most serine/threonine phosphorylation sites are dephosphorylated by members of the Phosphoprotein Phosphatase (PPP) family. However, we only know for a few phosphorylation sites which specific PPP dephosphorylates them. Although natural compounds such as calyculin A and okadaic acid inhibit PPPs at low nanomolar concentrations, no selective chemical PPP inhibitors exist. Here, we demonstrate the utility of endogenous tagging of genomic loci with an auxin-inducible degron (AID) as a strategy to investigate specific PPP signaling. Using Protein Phosphatase 6 (PP6) as an example, we demonstrate how rapidly inducible protein degradation can be employed to identify dephosphorylation SITES and elucidate PP6 biology. Using genome editing, we introduce AID-tags into each allele of the PP6 catalytic subunit (PP6c) in DLD-1 cells expressing the auxin receptor Tir1. Upon rapid auxin-induced degradation of PP6c, we perform quantitative mass spectrometry-based proteomics and phosphoproteomics to identify PP6 substrates in mitosis. PP6 is an essential enzyme with conserved roles in mitosis and growth signaling. Consistently, we identify candidate PP6c-dependent phosphorylation sites on proteins implicated in coordinating the mitotic cell cycle, cytoskeleton, gene expression, and mitogen-activated protein kinase (MAPK) and Hippo signaling. Finally, we demonstrate that PP6c opposes the activation of large tumor suppressor 1 (LATS1) by dephosphorylating Threonine 35 (T35) on Mps One Binder (MOB1), thereby blocking the interaction of MOB1 and LATS1. Our analyses highlight the utility of combining genome engineering, inducible degradation, and multiplexed phosphoproteomics to investigate signaling by individual PPPs on a global level, which is currently limited by the lack of tools for specific interrogation.
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4
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PPP6C, a serine-threonine phosphatase, regulates melanocyte differentiation and contributes to melanoma tumorigenesis through modulation of MITF activity. Sci Rep 2022; 12:5573. [PMID: 35368039 PMCID: PMC8976846 DOI: 10.1038/s41598-022-08936-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2021] [Accepted: 03/07/2022] [Indexed: 12/28/2022] Open
Abstract
It is critical to understand the molecular mechanisms governing the regulation of MITF, a lineage specific transcription factor in melanocytes and an oncogene in melanoma. We identified PPP6C, a serine/threonine phosphatase, as a key regulator of MITF in melanoma. PPP6C is the only recurrently mutated serine/threonine phosphatase across all human cancers identified in sequencing studies and the recurrent R264C mutation occurs exclusively in melanoma. Using a zebrafish developmental model system, we demonstrate that PPP6C expression disrupts melanocyte differentiation. Melanocyte disruption was rescued by engineering phosphomimetic mutations at serine residues on MITF. We developed an in vivo MITF promoter assay in zebrafish and studied the effects of PPP6C(R264C) on regulating MITF promoter activity. Expression of PPP6C(R264C) cooperated with oncogenic NRAS(Q61K) to accelerate melanoma initiation in zebrafish, consistent with a gain of function alteration. Using a human melanoma cell line, we examined the requirement for PPP6C in proliferation and MITF expression. We show that genetic inactivation of PPP6C increases MITF and target gene expression, decreases sensitivity to BRAF inhibition, and increases phosphorylated MITF in a BRAF(V600E) mutant melanoma cell line. Our data suggests that PPP6C may be a relevant drug target in melanoma and proposes a mechanism for its action.
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5
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Aurora A and AKT Kinase Signaling Associated with Primary Cilia. Cells 2021; 10:cells10123602. [PMID: 34944109 PMCID: PMC8699881 DOI: 10.3390/cells10123602] [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: 09/06/2021] [Revised: 12/16/2021] [Accepted: 12/17/2021] [Indexed: 02/07/2023] Open
Abstract
Dysregulation of kinase signaling is associated with various pathological conditions, including cancer, inflammation, and autoimmunity; consequently, the kinases involved have become major therapeutic targets. While kinase signaling pathways play crucial roles in multiple cellular processes, the precise manner in which their dysregulation contributes to disease is dependent on the context; for example, the cell/tissue type or subcellular localization of the kinase or substrate. Thus, context-selective targeting of dysregulated kinases may serve to increase the therapeutic specificity while reducing off-target adverse effects. Primary cilia are antenna-like structures that extend from the plasma membrane and function by detecting extracellular cues and transducing signals into the cell. Cilia formation and signaling are dynamically regulated through context-dependent mechanisms; as such, dysregulation of primary cilia contributes to disease in a variety of ways. Here, we review the involvement of primary cilia-associated signaling through aurora A and AKT kinases with respect to cancer, obesity, and other ciliopathies.
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6
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Lei WL, Li YY, Meng TG, Ning Y, Sun SM, Zhang CH, Gui Y, Wang ZB, Qian WP, Sun QY. Specific deletion of protein phosphatase 6 catalytic subunit in Sertoli cells leads to disruption of spermatogenesis. Cell Death Dis 2021; 12:883. [PMID: 34580275 PMCID: PMC8476514 DOI: 10.1038/s41419-021-04172-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2021] [Revised: 08/25/2021] [Accepted: 09/15/2021] [Indexed: 12/14/2022]
Abstract
Protein phosphatase 6 (PP6) is a member of the PP2A-like subfamily, which plays significant roles in numerous fundamental biological activities. We found that PPP6C plays important roles in male germ cells recently. Spermatogenesis is supported by the Sertoli cells in the seminiferous epithelium. In this study, we crossed Ppp6cF/F mice with AMH-Cre mice to gain mutant mice with specific depletion of the Ppp6c gene in the Sertoli cells. We discovered that the PPP6C cKO male mice were absolutely infertile and germ cells were largely lost during spermatogenesis. By combing phosphoproteome with bioinformatics analysis, we showed that the phosphorylation status of β-catenin at S552 (a marker of adherens junctions) was significantly upregulated in mutant mice. Abnormal β-catenin accumulation resulted in impaired testicular junction integrity, thus led to abnormal structure and functions of BTB. Taken together, our study reveals a novel function for PPP6C in male germ cell survival and differentiation by regulating the cell-cell communication through dephosphorylating β-catenin at S552.
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Affiliation(s)
- Wen-Long Lei
- Department of Reproductive Medicine, Peking University Shenzhen Hospital, Shenzhen, 518036, China
- CAS Key Laboratory of Quantitative Engineering Biology, Shenzhen Institute of Synthetic Biology, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, 518055, China
- Guangdong and Shenzhen Key Laboratory of Male Reproductive Medicine and Genetics, Institute of Urology, Peking University Shenzhen Hospital, Shenzhen PKU-HKUST Medical Center, Shenzhen, 518036, China
| | - Yuan-Yuan Li
- State Key Laboratory of Stem Cell and Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, 100101, China
| | - Tie-Gang Meng
- State Key Laboratory of Stem Cell and Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, 100101, China
- Fertility Preservation Lab, Guangdong-Hong Kong Metabolism & Reproduction Joint Laboratory, Reproductive Medicine Center, Guangdong Second Provincial General Hospital, Guangzhou, 510317, China
| | - Yan Ning
- State Key Laboratory of Stem Cell and Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, 100101, China
| | - Si-Min Sun
- State Key Laboratory of Stem Cell and Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, 100101, China
| | - Chun-Hui Zhang
- Department of Reproductive Medicine, Peking University Shenzhen Hospital, Shenzhen, 518036, China
- Guangdong and Shenzhen Key Laboratory of Male Reproductive Medicine and Genetics, Institute of Urology, Peking University Shenzhen Hospital, Shenzhen PKU-HKUST Medical Center, Shenzhen, 518036, China
| | - Yaoting Gui
- Guangdong and Shenzhen Key Laboratory of Male Reproductive Medicine and Genetics, Institute of Urology, Peking University Shenzhen Hospital, Shenzhen PKU-HKUST Medical Center, Shenzhen, 518036, China
| | - Zhen-Bo Wang
- State Key Laboratory of Stem Cell and Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, 100101, China.
| | - Wei-Ping Qian
- Department of Reproductive Medicine, Peking University Shenzhen Hospital, Shenzhen, 518036, China.
- Guangdong and Shenzhen Key Laboratory of Male Reproductive Medicine and Genetics, Institute of Urology, Peking University Shenzhen Hospital, Shenzhen PKU-HKUST Medical Center, Shenzhen, 518036, China.
| | - Qing-Yuan Sun
- Fertility Preservation Lab, Guangdong-Hong Kong Metabolism & Reproduction Joint Laboratory, Reproductive Medicine Center, Guangdong Second Provincial General Hospital, Guangzhou, 510317, China.
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7
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Tavernier N, Sicheri F, Pintard L. Aurora A kinase activation: Different means to different ends. J Cell Biol 2021; 220:212490. [PMID: 34287649 PMCID: PMC8298103 DOI: 10.1083/jcb.202106128] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Aurora A is a serine/threonine kinase essential for mitotic entry and spindle assembly. Recent molecular studies have revealed the existence of multiple, distinct mechanisms of Aurora A activation, each occurring at specific subcellular locations, optimized for cellular context, and primed by signaling events including phosphorylation and oxidation.
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Affiliation(s)
- Nicolas Tavernier
- Programme équipe Labellisée Ligue Contre le Cancer - Université de Paris, Centre National de la Recherche Scientifique, Institut Jacques Monod, Paris, France
| | - Frank Sicheri
- Centre for Systems Biology, Lunenfeld Tanenbaum Research Institute, Sinai Health System, Toronto, Canada.,Department of Molecular Genetics, University of Toronto, Toronto, ON, Canada.,Department of Biochemistry, University of Toronto, Toronto, ON, Canada
| | - Lionel Pintard
- Programme équipe Labellisée Ligue Contre le Cancer - Université de Paris, Centre National de la Recherche Scientifique, Institut Jacques Monod, Paris, France
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8
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Yu B, Lin Q, Huang C, Zhang B, Wang Y, Jiang Q, Zhang C, Yi J. SUMO proteases SENP3 and SENP5 spatiotemporally regulate the kinase activity of Aurora A. J Cell Sci 2021; 134:jcs249771. [PMID: 34313310 DOI: 10.1242/jcs.249771] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2020] [Accepted: 05/24/2021] [Indexed: 01/14/2023] Open
Abstract
Precise chromosome segregation is mediated by a well-assembled mitotic spindle, which requires balance of the kinase activity of Aurora A (AurA, also known as AURKA). However, how this kinase activity is regulated remains largely unclear. Here, using in vivo and in vitro assays, we report that conjugation of SUMO2 with AurA at K258 in early mitosis promotes the kinase activity of AurA and facilitates the binding with its activator Bora. Knockdown of the SUMO proteases SENP3 and SENP5 disrupts the deSUMOylation of AurA, leading to increased kinase activity and abnormalities in spindle assembly and chromosome segregation, which could be rescued by suppressing the kinase activity of AurA. Collectively, these results demonstrate that SENP3 and SENP5 deSUMOylate AurA to render spatiotemporal control on its kinase activity in mitosis. This article has an associated First Person interview with the first author of the paper.
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Affiliation(s)
- Bin Yu
- Shanghai Key Laboratory for Tumor Microenvironment and Inflammation, Key Laboratory of Cell Differentiation and Apoptosis of Chinese Ministry of Education, Department of Biochemistry and Molecular Cell Biology, Shanghai Jiao Tong University School of Medicine, 280 South Chongqing Road, Shanghai 200025, China
- The Key Laboratory of Cell Proliferation and Differentiation of the Ministry of Education, College of Life Sciences, Peking University, Beijing 100871, China
| | - Qiaoyu Lin
- The Key Laboratory of Cell Proliferation and Differentiation of the Ministry of Education, College of Life Sciences, Peking University, Beijing 100871, China
| | - Chao Huang
- Medical School, Kunming University of Science and Technology, Kunming 650091, China
| | - Boyan Zhang
- The Key Laboratory of Cell Proliferation and Differentiation of the Ministry of Education, College of Life Sciences, Peking University, Beijing 100871, China
| | - Ying Wang
- Shanghai Key Laboratory for Tumor Microenvironment and Inflammation, Key Laboratory of Cell Differentiation and Apoptosis of Chinese Ministry of Education, Department of Biochemistry and Molecular Cell Biology, Shanghai Jiao Tong University School of Medicine, 280 South Chongqing Road, Shanghai 200025, China
| | - Qing Jiang
- The Key Laboratory of Cell Proliferation and Differentiation of the Ministry of Education, College of Life Sciences, Peking University, Beijing 100871, China
| | - Chuanmao Zhang
- The Key Laboratory of Cell Proliferation and Differentiation of the Ministry of Education, College of Life Sciences, Peking University, Beijing 100871, China
| | - Jing Yi
- Shanghai Key Laboratory for Tumor Microenvironment and Inflammation, Key Laboratory of Cell Differentiation and Apoptosis of Chinese Ministry of Education, Department of Biochemistry and Molecular Cell Biology, Shanghai Jiao Tong University School of Medicine, 280 South Chongqing Road, Shanghai 200025, China
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9
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Garcia-Alvarez A, Ortiz C, Muñoz-Couselo E. Current Perspectives and Novel Strategies of NRAS-Mutant Melanoma. Onco Targets Ther 2021; 14:3709-3719. [PMID: 34135599 PMCID: PMC8202735 DOI: 10.2147/ott.s278095] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2021] [Accepted: 05/28/2021] [Indexed: 12/15/2022] Open
Abstract
Melanoma is the deadliest cutaneous cancer. Activating mutations in NRAS are found in 20% of melanomas. NRAS-mutant melanoma is more aggressive and, therefore, has poorer outcomes, compared to non-NRAS-mutant melanoma. Despite promising preclinical data, to date immune checkpoint inhibitors remain the standard of care for locally advanced unresectable or metastatic NRAS melanoma. Data for efficacy of immunotherapy for NRAS melanoma mainly come from retrospective cohorts with divergent conclusions. MEK inhibitors have been the most developed targeted therapy approach. Although associated with an increase in progression-free survival, MEK inhibitors do not provide any benefit in terms of overall survival. Combination strategies with PI3K-AKT-mTOR pathway and CDK4/6 inhibitors seem to increase MEK inhibitors' benefit. Nevertheless, results from clinical trials are still prelaminar. A greater comprehension of the biology and intracellular interactions of NRAS-mutant melanoma will outline novel impactful strategies which could improve prognosis of these subgroup of patients.
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Affiliation(s)
- Alejandro Garcia-Alvarez
- Vall d’Hebron University Hospital, Medical Oncology Department, Melanoma and Other Skin Tumors Unit, Vall Hebron Institute of Oncology (VHIO), Barcelona, 08035, Spain
| | - Carolina Ortiz
- Vall d’Hebron University Hospital, Medical Oncology Department, Melanoma and Other Skin Tumors Unit, Vall Hebron Institute of Oncology (VHIO), Barcelona, 08035, Spain
| | - Eva Muñoz-Couselo
- Vall d’Hebron University Hospital, Medical Oncology Department, Melanoma and Other Skin Tumors Unit, Vall Hebron Institute of Oncology (VHIO), Barcelona, 08035, Spain
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10
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Fernando M, Duijf PHG, Proctor M, Stevenson AJ, Ehmann A, Vora S, Skalamera D, Adams M, Gabrielli B. Dysregulated G2 phase checkpoint recovery pathway reduces DNA repair efficiency and increases chromosomal instability in a wide range of tumours. Oncogenesis 2021; 10:41. [PMID: 33993200 PMCID: PMC8124070 DOI: 10.1038/s41389-021-00329-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2020] [Revised: 04/06/2021] [Accepted: 04/20/2021] [Indexed: 11/12/2022] Open
Abstract
Defective DNA repair is being demonstrated to be a useful target in cancer treatment. Currently, defective repair is identified by specific gene mutations, however defective repair is a common feature of cancers without these mutations. DNA damage triggers cell cycle checkpoints that are responsible for co-ordinating cell cycle arrest and DNA repair. Defects in checkpoint signalling components such as ataxia telangiectasia mutated (ATM) occur in a low proportion of cancers and are responsible for reduced DNA repair and increased genomic instability. Here we have investigated the AURKA-PLK1 cell cycle checkpoint recovery pathway that is responsible for exit from the G2 phase cell cycle checkpoint arrest. We demonstrate that dysregulation of PP6 and AURKA maintained elevated PLK1 activation to promote premature exit from only ATM, and not ATR-dependent checkpoint arrest. Surprisingly, depletion of the B55α subunit of PP2A that negatively regulates PLK1 was capable of overcoming ATM and ATR checkpoint arrests. Dysregulation of the checkpoint recovery pathway reduced S/G2 phase DNA repair efficiency and increased genomic instability. We found a strong correlation between dysregulation of the PP6-AURKA-PLK1-B55α checkpoint recovery pathway with signatures of defective homologous recombination and increased chromosomal instability in several cancer types. This work has identified an unrealised source of G2 phase DNA repair defects and chromosomal instability that are likely to be sensitive to treatments targeting defective repair.
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Affiliation(s)
- Madushan Fernando
- Mater Research Institute-The University of Queensland, Brisbane, QLD, Australia
| | - Pascal H G Duijf
- Institute of Health and Biomedical Innovation, Queensland University of Technology (QUT), Faculty of Health, School of Biomedical Sciences, Brisbane, QLD, Australia.,Centre for Data Science, Queensland University of Technology (QUT), Brisbane, QLD, Australia.,University of Queensland Diamantina Institute, The University of Queensland, Translational Research Institute, Brisbane, QLD, Australia
| | - Martina Proctor
- Mater Research Institute-The University of Queensland, Brisbane, QLD, Australia
| | | | - Anna Ehmann
- Mater Research Institute-The University of Queensland, Brisbane, QLD, Australia
| | - Shivam Vora
- Mater Research Institute-The University of Queensland, Brisbane, QLD, Australia
| | - Dubravka Skalamera
- Mater Research Institute-The University of Queensland, Brisbane, QLD, Australia
| | - Mark Adams
- Institute of Health and Biomedical Innovation, Queensland University of Technology (QUT), Faculty of Health, School of Biomedical Sciences, Brisbane, QLD, Australia
| | - Brian Gabrielli
- Mater Research Institute-The University of Queensland, Brisbane, QLD, Australia.
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11
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Kanazawa K, Kishimoto K, Nomura M, Kurosawa K, Kato H, Inoue Y, Miura K, Fukui K, Yamashita Y, Sato I, Tsuji H, Watanabe T, Tanaka T, Yasuda J, Tanuma N, Shima H. Ppp6c haploinsufficiency accelerates UV-induced BRAF(V600E)-initiated melanomagenesis. Cancer Sci 2021; 112:2233-2244. [PMID: 33743547 PMCID: PMC8177767 DOI: 10.1111/cas.14895] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2020] [Revised: 03/10/2021] [Accepted: 03/17/2021] [Indexed: 02/06/2023] Open
Abstract
According to TCGA database, mutations in PPP6C (encoding phosphatase PP6) are found in c. 10% of tumors from melanoma patients, in which they coexist with BRAF and NRAS mutations. To assess PP6 function in melanoma carcinogenesis, we generated mice in which we could specifically induce BRAF(V600E) expression and delete Ppp6c in melanocytes. In these mice, melanoma susceptibility following UVB irradiation exhibited the following pattern: Ppp6c semi‐deficient (heterozygous) > Ppp6c wild‐type > Ppp6c‐deficient (homozygous) tumor types. Next‐generation sequencing of Ppp6c heterozygous and wild‐type melanoma tumors revealed that all harbored Trp53 mutations. However, Ppp6c heterozygous tumors showed a higher Signature 1 (mitotic/mitotic clock) mutation index compared with Ppp6c wild‐type tumors, suggesting increased cell division. Analysis of cell lines derived from either Ppp6c heterozygous or wild‐type melanoma tissues showed that both formed tumors in nude mice, but Ppp6c heterozygous tumors grew faster compared with those from the wild‐type line. Ppp6c knockdown via siRNA in the Ppp6c heterozygous line promoted the accumulation of genomic damage and enhanced apoptosis relative to siRNA controls. We conclude that in the presence of BRAF(V600E) expression and UV‐induced Trp53 mutation, Ppp6c haploinsufficiency promotes tumorigenesis.
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Affiliation(s)
- Kosuke Kanazawa
- Division of Cancer Chemotherapy, Miyagi Cancer Center Research Institute, Miyagi, Japan.,Division of Surgery, Miyagi Cancer Center, Miyagi, Japan.,Division of Cancer Molecular Biology, Tohoku University School of Medicine, Miyagi, Japan
| | - Kazuhiro Kishimoto
- Division of Cancer Chemotherapy, Miyagi Cancer Center Research Institute, Miyagi, Japan.,Division of Cancer Molecular Biology, Tohoku University School of Medicine, Miyagi, Japan.,Department of Head and Neck Surgery, Kanazawa Medical University, Ishikawa, Japan
| | - Miyuki Nomura
- Division of Cancer Chemotherapy, Miyagi Cancer Center Research Institute, Miyagi, Japan
| | - Koreyuki Kurosawa
- Division of Cancer Chemotherapy, Miyagi Cancer Center Research Institute, Miyagi, Japan.,Department of Plastic and Reconstructive Surgery, Tohoku University School of Medicine, Miyagi, Japan
| | - Hiroyuki Kato
- Division of Cancer Chemotherapy, Miyagi Cancer Center Research Institute, Miyagi, Japan
| | - Yui Inoue
- Division of Cancer Chemotherapy, Miyagi Cancer Center Research Institute, Miyagi, Japan
| | - Koh Miura
- Division of Surgery, Miyagi Cancer Center, Miyagi, Japan
| | - Katsuya Fukui
- Division of Cancer Chemotherapy, Miyagi Cancer Center Research Institute, Miyagi, Japan.,Division of Cancer Molecular Biology, Tohoku University School of Medicine, Miyagi, Japan
| | - Yoji Yamashita
- Division of Cancer Chemotherapy, Miyagi Cancer Center Research Institute, Miyagi, Japan
| | - Ikuro Sato
- Division of Pathology, Miyagi Cancer Center, Miyagi, Japan
| | - Hiroyuki Tsuji
- Department of Head and Neck Surgery, Kanazawa Medical University, Ishikawa, Japan
| | - Toshio Watanabe
- Department of Biological Science, Graduate School of Humanities and Sciences Nara Women's University, Nara, Japan
| | - Takuji Tanaka
- Research Center of Diagnostic Pathology, Gifu Municipal Hospital, Gifu, Japan
| | - Jun Yasuda
- Division of Cancer Molecular Biology, Tohoku University School of Medicine, Miyagi, Japan.,Cancer Genome Center, Miyagi Cancer Center Research Institute, Miyagi, Japan.,Tohoku Medical Megabank Organization, Tohoku University, Miyagi, Japan
| | - Nobuhiro Tanuma
- Division of Cancer Chemotherapy, Miyagi Cancer Center Research Institute, Miyagi, Japan.,Division of Cancer Molecular Biology, Tohoku University School of Medicine, Miyagi, Japan
| | - Hiroshi Shima
- Division of Cancer Chemotherapy, Miyagi Cancer Center Research Institute, Miyagi, Japan.,Division of Cancer Molecular Biology, Tohoku University School of Medicine, Miyagi, Japan
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12
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Cho E, Lou HJ, Kuruvilla L, Calderwood DA, Turk BE. PPP6C negatively regulates oncogenic ERK signaling through dephosphorylation of MEK. Cell Rep 2021; 34:108928. [PMID: 33789117 PMCID: PMC8068315 DOI: 10.1016/j.celrep.2021.108928] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2020] [Revised: 01/26/2021] [Accepted: 03/10/2021] [Indexed: 12/21/2022] Open
Abstract
Flux through the RAF-MEK-ERK protein kinase cascade is shaped by phosphatases acting on the core components of the pathway. Despite being an established drug target and a hub for crosstalk regulation, little is known about dephosphorylation of MEK, the central kinase within the cascade. Here, we identify PPP6C, a phosphatase frequently mutated or downregulated in melanoma, as a major MEK phosphatase in cells exhibiting oncogenic ERK pathway activation. Recruitment of MEK to PPP6C occurs through an interaction with its associated regulatory subunits. Loss of PPP6C causes hyperphosphorylation of MEK at activating and crosstalk phosphorylation sites, promoting signaling through the ERK pathway and decreasing sensitivity to MEK inhibitors. Recurrent melanoma-associated PPP6C mutations cause MEK hyperphosphorylation, suggesting that they promote disease at least in part by activating the core oncogenic pathway driving melanoma. Collectively, our studies identify a key negative regulator of ERK signaling that may influence susceptibility to targeted cancer therapies. Through an shRNA screen, Cho et al. identify PPP6C as a phosphatase that inactivates the kinase MEK, sensitizing tumor cells to clinical MEK inhibitors. This study suggests that cancer-associated loss-of-function PPP6C mutations prevalent in melanoma serve to activate the core oncogenic RAF-MEK-ERK pathway that drives the disease.
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Affiliation(s)
- Eunice Cho
- Department of Pharmacology, Yale School of Medicine, New Haven, CT 06520, USA
| | - Hua Jane Lou
- Department of Pharmacology, Yale School of Medicine, New Haven, CT 06520, USA
| | - Leena Kuruvilla
- Department of Pharmacology, Yale School of Medicine, New Haven, CT 06520, USA
| | - David A Calderwood
- Department of Pharmacology, Yale School of Medicine, New Haven, CT 06520, USA; Department of Cell Biology, Yale School of Medicine, New Haven, CT 06520, USA
| | - Benjamin E Turk
- Department of Pharmacology, Yale School of Medicine, New Haven, CT 06520, USA.
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13
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Polverino F, Naso FD, Asteriti IA, Palmerini V, Singh D, Valente D, Bird AW, Rosa A, Mapelli M, Guarguaglini G. The Aurora-A/TPX2 Axis Directs Spindle Orientation in Adherent Human Cells by Regulating NuMA and Microtubule Stability. Curr Biol 2020; 31:658-667.e5. [PMID: 33275894 DOI: 10.1016/j.cub.2020.10.096] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2020] [Revised: 09/16/2020] [Accepted: 10/30/2020] [Indexed: 12/17/2022]
Abstract
Mitotic spindle orientation is a crucial process that defines the axis of cell division, contributing to daughter cell positioning and fate, and hence to tissue morphogenesis and homeostasis.1,2 The trimeric NuMA/LGN/Gαi complex, the major determinant of spindle orientation, exerts pulling forces on the spindle poles by anchoring astral microtubules (MTs) and dynein motors to the cell cortex.3,4 Mitotic kinases contribute to correct spindle orientation by regulating nuclear mitotic apparatus protein (NuMA) localization,5-7 among which the Aurora-A centrosomal kinase regulates NuMA targeting to the cell cortex in metaphase.8,9 Aurora-A and its activator targeting protein for Xklp2 (TPX2) are frequently overexpressed in cancer,10-12 raising the question as to whether spindle orientation is among the processes downstream the Aurora-A/TPX2 signaling axis altered under pathological conditions. Here, we investigated the role of TPX2 in the Aurora-A- and NuMA-dependent spindle orientation. We show that, in cultured adherent human cells, the interaction with TPX2 is required for Aurora-A to exert this function. We also show that Aurora-A, TPX2, and NuMA are part of a complex at spindle MTs, where TPX2 acts as a platform for Aurora-A regulation of NuMA. Interestingly, excess TPX2 does not influence NuMA localization but induces a "super-alignment" of the spindle axis with respect to the substrate, although an excess of Aurora-A induces spindle misorientation. These opposite effects are both linked to altered MT stability. Overall, our results highlight the importance of TPX2 for spindle orientation and suggest that spindle orientation is differentially sensitive to unbalanced levels of Aurora-A, TPX2, or the Aurora-A/TPX2 complex.
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Affiliation(s)
- Federica Polverino
- Institute of Molecular Biology and Pathology, National Research Council of Italy, c/o Department of Biology and Biotechnology, Sapienza University of Rome, Via degli Apuli 4, 00185 Rome, Italy; Department of Experimental Oncology, IEO European Institute of Oncology IRCCS, Via Adamello 16, 20141 Milan, Italy
| | - Francesco D Naso
- Institute of Molecular Biology and Pathology, National Research Council of Italy, c/o Department of Biology and Biotechnology, Sapienza University of Rome, Via degli Apuli 4, 00185 Rome, Italy
| | - Italia A Asteriti
- Institute of Molecular Biology and Pathology, National Research Council of Italy, c/o Department of Biology and Biotechnology, Sapienza University of Rome, Via degli Apuli 4, 00185 Rome, Italy
| | - Valentina Palmerini
- Department of Experimental Oncology, IEO European Institute of Oncology IRCCS, Via Adamello 16, 20141 Milan, Italy
| | - Divya Singh
- Max Planck Institute of Molecular Physiology, Otto-Hahn-Str. 11, 44227 Dortmund, Germany
| | - Davide Valente
- Institute of Molecular Biology and Pathology, National Research Council of Italy, c/o Department of Biology and Biotechnology, Sapienza University of Rome, Via degli Apuli 4, 00185 Rome, Italy
| | - Alexander W Bird
- Max Planck Institute of Molecular Physiology, Otto-Hahn-Str. 11, 44227 Dortmund, Germany
| | - Alessandro Rosa
- Center for Life Nano Science, Istituto Italiano di Tecnologia, Viale Regina Elena 291, 00161 Rome, Italy; Department of Biology and Biotechnology "C. Darwin," Sapienza University of Rome, Piazzale Aldo Moro 5, 00185 Rome, Italy
| | - Marina Mapelli
- Department of Experimental Oncology, IEO European Institute of Oncology IRCCS, Via Adamello 16, 20141 Milan, Italy.
| | - Giulia Guarguaglini
- Institute of Molecular Biology and Pathology, National Research Council of Italy, c/o Department of Biology and Biotechnology, Sapienza University of Rome, Via degli Apuli 4, 00185 Rome, Italy.
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14
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Chong W, Wang Z, Shang L, Jia S, Liu J, Fang Z, Du F, Wu H, Liu Y, Chen Y, Chen H. Association of clock-like mutational signature with immune checkpoint inhibitor outcome in patients with melanoma and NSCLC. MOLECULAR THERAPY. NUCLEIC ACIDS 2020; 23:89-100. [PMID: 33335795 PMCID: PMC7723771 DOI: 10.1016/j.omtn.2020.10.033] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/20/2020] [Accepted: 10/21/2020] [Indexed: 12/15/2022]
Abstract
Immune checkpoint inhibitor (ICI) therapy has achieved remarkable clinical benefit in melanoma and non-small cell lung cancer (NSCLC). Tumor mutational signatures are the fingerprints of endogenous and exogenous factors that have acted throughout tumorigenesis and heterogeneity; however, their association with immune response in ICI-treated samples remains unclear. Here, we leveraged whole-exome sequencing (WES)-based mutational profiles combined with clinicopathologic characteristics from melanoma and NSCLC datasets to examine whether tumor genomic features contribute to clinical benefit of ICI treatment. Mutational data acquired from targeted next-generation sequencing (NGS) assays (MSK-IMPACT panels) were also employed for further corroboration. A mutational signature (known as age-related clock-like processing) characterized by enrichment of C>T mutations at NpCpG trinucleotides were identified to be associated with a worse prognosis and lower tumor mutation load (TML) in both WES and targeted NGS immunotherapy cohorts. We also analyzed gene transcriptomic profiles and identified immune regulation-related gene pathways that were significantly altered in samples with different clock-like signature grouping. Leucocyte subset analysis further revealed that clock-like signature was associated with the reduction of cytotoxic cell infiltration and elevation of regulatory T cells. Overall, our work re-annotated that the age-related clock-like signature was associated with worse prognosis and lower immune activity, offering opportunities to stratify patients into optimal immunotherapy plans based on genomic subtyping.
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Affiliation(s)
- Wei Chong
- Department of Gastrointestinal Surgery, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, Shandong 250021, China.,Department of Gastrointestinal Surgery, Shandong Provincial Hospital, Cheeloo College of Medicine, Shandong University, Jinan, Shandong 250021, China.,Key Laboratory of Engineering of Shandong Province, Shandong Provincial Hospital, Jinan, Shandong 250021, China
| | - Zhe Wang
- Tianjin Sino-US Diagnostics Co., Ltd, Tianjin 300060, China
| | - Liang Shang
- Department of Gastrointestinal Surgery, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, Shandong 250021, China.,Department of Gastrointestinal Surgery, Shandong Provincial Hospital, Cheeloo College of Medicine, Shandong University, Jinan, Shandong 250021, China.,Key Laboratory of Engineering of Shandong Province, Shandong Provincial Hospital, Jinan, Shandong 250021, China
| | - Shengtao Jia
- Department of Tumor Cell Biology, National Clinical Research Center for Cancer, Tianjin's Clinical Research Center for Cancer, Tianjin Medical University Cancer Institute and Hospital, Tianjin 300060, China
| | - Jin Liu
- Department of Gastroenterology, Key Laboratory of Engineering of Shandong Province, Shandong Provincial Hospital, Jinan, Shandong 250021, China
| | - Zhen Fang
- Department of Gastrointestinal Surgery, Shandong Provincial Hospital, Cheeloo College of Medicine, Shandong University, Jinan, Shandong 250021, China.,Key Laboratory of Engineering of Shandong Province, Shandong Provincial Hospital, Jinan, Shandong 250021, China
| | - Fengying Du
- Department of Gastrointestinal Surgery, Shandong Provincial Hospital, Cheeloo College of Medicine, Shandong University, Jinan, Shandong 250021, China.,Key Laboratory of Engineering of Shandong Province, Shandong Provincial Hospital, Jinan, Shandong 250021, China
| | - Hao Wu
- Department of Gastrointestinal Surgery, Shandong Provincial Hospital, Cheeloo College of Medicine, Shandong University, Jinan, Shandong 250021, China.,Key Laboratory of Engineering of Shandong Province, Shandong Provincial Hospital, Jinan, Shandong 250021, China
| | - Yang Liu
- Department of Gastrointestinal Surgery, Shandong Provincial Hospital, Cheeloo College of Medicine, Shandong University, Jinan, Shandong 250021, China.,Key Laboratory of Engineering of Shandong Province, Shandong Provincial Hospital, Jinan, Shandong 250021, China
| | - Yang Chen
- Department of Radiation Oncology, Tianjin Medical University Cancer Institute and Hospital, National Clinical Research Center for Cancer, Key Laboratory of Cancer Prevention and Therapy, Tianjin's Clinical Research Center for Cancer, Tianjin 300060, China
| | - Hao Chen
- Clinical Research Center of Shandong University, Clinical Epidemiology Unit, Qilu Hospital of Shandong University, Jinan, Shandong 250021, China
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15
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Ni G, Ma Z, Wong JP, Zhang Z, Cousins E, Major MB, Damania B. PPP6C Negatively Regulates STING-Dependent Innate Immune Responses. mBio 2020; 11:e01728-20. [PMID: 32753499 PMCID: PMC7407089 DOI: 10.1128/mbio.01728-20] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2020] [Accepted: 06/30/2020] [Indexed: 12/17/2022] Open
Abstract
Stimulator of interferon genes (STING) is an essential adaptor protein of the innate DNA-sensing signaling pathway, which recognizes genomic DNA from invading pathogens to establish antiviral responses in host cells. STING activity is tightly regulated by several posttranslational modifications, including phosphorylation. However, specifically how the phosphorylation status of STING is modulated by kinases and phosphatases remains to be fully elucidated. In this study, we identified protein phosphatase 6 catalytic subunit (PPP6C) as a binding partner of Kaposi's sarcoma-associated herpesvirus (KSHV) open reading frame 48 (ORF48), which is a negative regulator of the cyclic GMP-AMP synthase (cGAS)-STING pathway. PPP6C depletion enhances double-stranded DNA (dsDNA)-induced and 5'ppp double-stranded RNA (dsRNA)-induced but not poly(I:C)-induced innate immune responses. PPP6C negatively regulates dsDNA-induced IRF3 activation but not NF-κB activation. Deficiency of PPP6C greatly inhibits the replication of herpes simplex virus 1 (HSV-1) and vesicular stomatitis virus (VSV) as well as the reactivation of KSHV, due to increased type I interferon production. We further demonstrated that PPP6C interacts with STING and that loss of PPP6C enhances STING phosphorylation. These data demonstrate the important role of PPP6C in regulating STING phosphorylation and activation, which provides an additional mechanism by which the host responds to viral infection.IMPORTANCE Cytosolic DNA, which usually comes from invading microbes, is a dangerous signal to the host. The cGAS-STING pathway is the major player that detects cytosolic DNA and then evokes the innate immune response. As an adaptor protein, STING plays a central role in controlling activation of the cGAS-STING pathway. Although transient activation of STING is essential to trigger the host defense during pathogen invasion, chronic STING activation has been shown to be associated with several autoinflammatory diseases. Here, we report that PPP6C negatively regulates the cGAS-STING pathway by removing STING phosphorylation, which is required for its activation. Dephosphorylation of STING by PPP6C helps prevent the sustained production of STING-dependent cytokines, which would otherwise lead to severe autoimmune disorders. This work provides additional mechanisms on the regulation of STING activity and might facilitate the development of novel therapeutics designed to prevent a variety of autoinflammatory disorders.
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Affiliation(s)
- Guoxin Ni
- Department of Microbiology and Immunology, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA
- Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA
| | - Zhe Ma
- Department of Microbiology and Immunology, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA
- Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA
| | - Jason P Wong
- Department of Microbiology and Immunology, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA
- Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA
| | - Zhigang Zhang
- Department of Microbiology and Immunology, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA
- Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA
| | - Emily Cousins
- Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA
| | - M Ben Major
- Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA
| | - Blossom Damania
- Department of Microbiology and Immunology, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA
- Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA
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16
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Vanni I, Tanda ET, Dalmasso B, Pastorino L, Andreotti V, Bruno W, Boutros A, Spagnolo F, Ghiorzo P. Non-BRAF Mutant Melanoma: Molecular Features and Therapeutical Implications. Front Mol Biosci 2020; 7:172. [PMID: 32850962 PMCID: PMC7396525 DOI: 10.3389/fmolb.2020.00172] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2020] [Accepted: 07/03/2020] [Indexed: 02/06/2023] Open
Abstract
Melanoma is one of the most aggressive tumors of the skin, and its incidence is growing worldwide. Historically considered a drug resistant disease, since 2011 the therapeutic landscape of melanoma has radically changed. Indeed, the improved knowledge of the immune system and its interactions with the tumor, and the ever more thorough molecular characterization of the disease, has allowed the development of immunotherapy on the one hand, and molecular target therapies on the other. The increased availability of more performing technologies like Next-Generation Sequencing (NGS), and the availability of increasingly large genetic panels, allows the identification of several potential therapeutic targets. In light of this, numerous clinical and preclinical trials are ongoing, to identify new molecular targets. Here, we review the landscape of mutated non-BRAF skin melanoma, in light of recent data deriving from Whole-Exome Sequencing (WES) or Whole-Genome Sequencing (WGS) studies on melanoma cohorts for which information on the mutation rate of each gene was available, for a total of 10 NGS studies and 992 samples, focusing on available, or in experimentation, targeted therapies beyond those targeting mutated BRAF. Namely, we describe 33 established and candidate driver genes altered with frequency greater than 1.5%, and the current status of targeted therapy for each gene. Only 1.1% of the samples showed no coding mutations, whereas 30% showed at least one mutation in the RAS genes (mostly NRAS) and 70% showed mutations outside of the RAS genes, suggesting potential new roads for targeted therapy. Ongoing clinical trials are available for 33.3% of the most frequently altered genes.
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Affiliation(s)
- Irene Vanni
- Genetics of Rare Cancers, IRCCS Ospedale Policlinico San Martino, Genova, Italy
- Genetics of Rare Cancers, Department of Internal Medicine and Medical Specialties, University of Genoa, Genova, Italy
| | | | - Bruna Dalmasso
- Genetics of Rare Cancers, IRCCS Ospedale Policlinico San Martino, Genova, Italy
- Genetics of Rare Cancers, Department of Internal Medicine and Medical Specialties, University of Genoa, Genova, Italy
| | - Lorenza Pastorino
- Genetics of Rare Cancers, IRCCS Ospedale Policlinico San Martino, Genova, Italy
- Genetics of Rare Cancers, Department of Internal Medicine and Medical Specialties, University of Genoa, Genova, Italy
| | - Virginia Andreotti
- Genetics of Rare Cancers, IRCCS Ospedale Policlinico San Martino, Genova, Italy
- Genetics of Rare Cancers, Department of Internal Medicine and Medical Specialties, University of Genoa, Genova, Italy
| | - William Bruno
- Genetics of Rare Cancers, IRCCS Ospedale Policlinico San Martino, Genova, Italy
- Genetics of Rare Cancers, Department of Internal Medicine and Medical Specialties, University of Genoa, Genova, Italy
| | - Andrea Boutros
- Medical Oncology, IRCCS Ospedale Policlinico San Martino, Genova, Italy
| | | | - Paola Ghiorzo
- Genetics of Rare Cancers, IRCCS Ospedale Policlinico San Martino, Genova, Italy
- Genetics of Rare Cancers, Department of Internal Medicine and Medical Specialties, University of Genoa, Genova, Italy
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17
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Phosphorylation of PLK3 Is Controlled by Protein Phosphatase 6. Cells 2020; 9:cells9061506. [PMID: 32575753 PMCID: PMC7349513 DOI: 10.3390/cells9061506] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2020] [Revised: 06/12/2020] [Accepted: 06/17/2020] [Indexed: 12/29/2022] Open
Abstract
Polo-like kinases play essential roles in cell cycle control and mitosis. In contrast to other members of this kinase family, PLK3 has been reported to be activated upon cellular stress including DNA damage, hypoxia and osmotic stress. Here we knocked out PLK3 in human non-transformed RPE cells using CRISPR/Cas9-mediated gene editing. Surprisingly, we find that loss of PLK3 does not impair stabilization of HIF1α after hypoxia, phosphorylation of the c-Jun after osmotic stress and dynamics of DNA damage response after exposure to ionizing radiation. Similarly, RNAi-mediated depletion of PLK3 did not impair stress response in human transformed cell lines. Exposure of cells to various forms of stress also did not affect kinase activity of purified EGFP-PLK3. We conclude that PLK3 is largely dispensable for stress response in human cells. Using mass spectrometry, we identify protein phosphatase 6 as a new interacting partner of PLK3. Polo box domain of PLK3 mediates the interaction with the PP6 complex. Finally, we find that PLK3 is phosphorylated at Thr219 in the T-loop and that PP6 constantly dephosphorylates this residue. However, in contrast to PLK1, phosphorylation of Thr219 does not upregulate enzymatic activity of PLK3, suggesting that activation of both kinases is regulated by distinct mechanisms.
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18
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Cui P, Abbasi B, Lin D, Rui R, Ju S. Aurora A inhibition disrupts chromosome condensation and spindle assembly during the first embryonic division in pigs. Reprod Domest Anim 2020; 55:584-593. [PMID: 32053743 DOI: 10.1111/rda.13655] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2019] [Accepted: 02/10/2020] [Indexed: 11/29/2022]
Abstract
As common overexpression of Aurora A in various tumours, much attention has focused on its function in inducing cancer, and its value in cancer therapeutics, considerably less is known regarding its role in the first cleavage division of mammalian embryos. Here, we highlight an indispensable role of Aurora A during the first mitotic division progression of pig embryos just after meiosis. The expression and spatiotemporal localization of Aurora A were initially assessed in pig embryos during the first mitotic division by Western blot analysis and indirect immunofluorescent staining. Then, the potential role of Aurora A was further evaluated using a highly selective Aurora A inhibitor, MLN8054, during this mitotic progression in pig embryos. Aurora A was found to express and exhibit a specific dynamic intracellular localization pattern during the first mitotic division in pig embryos. Aurora A was diffused in the cytoplasm at the prophase stage, and then exhibited a dynamic intracellular localization which was tightly associated with the chromosome and spindle dynamics throughout subsequent mitotic phases. Inhibition of Aurora A by MLN8054 treatment led to the failure of the first cleavage, with the majority of embryos being arrested in prophase of the mitotic division. Further subcellular structure examination showed that Aurora A inhibition not only led to the failure of spindle microtubule assembly, but also resulted in severe defects in chromosome condensation, accompanied by an obvious decrease in p-TACC3(S558) expression during the prophase of the first mitosis. Together, these results illustrated that Aurora A is crucial for both spindle assembly and chromosome condensation during the first mitotic division in pig embryos, and that the regulation of Aurora A may be associated with its effects on p-TACC3(S558) expression.
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Affiliation(s)
- Panpan Cui
- MOE Joint International Research Laboratory of Animal Health and Food Safety, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, China
| | - Benazir Abbasi
- MOE Joint International Research Laboratory of Animal Health and Food Safety, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, China
| | - Defeng Lin
- MOE Joint International Research Laboratory of Animal Health and Food Safety, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, China
| | - Rong Rui
- MOE Joint International Research Laboratory of Animal Health and Food Safety, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, China
| | - Shiqiang Ju
- MOE Joint International Research Laboratory of Animal Health and Food Safety, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, China
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19
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Lei WL, Han F, Hu MW, Liang QX, Meng TG, Zhou Q, Ouyang YC, Hou Y, Schatten H, Wang ZB, Sun QY. Protein phosphatase 6 is a key factor regulating spermatogenesis. Cell Death Differ 2019; 27:1952-1964. [PMID: 31819157 DOI: 10.1038/s41418-019-0472-9] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2019] [Accepted: 11/27/2019] [Indexed: 12/29/2022] Open
Abstract
Protein phosphatase 6 (PP6) is a member of the PP2A-like subfamily, which plays a critical role in many fundamental cellular processes. We recently reported that PP6 is essential for female fertility. Here, we report that PP6 is involved in meiotic recombination and that germ cell-specific deletion of PP6 by Stra8-Cre causes defective spermatogenesis. The PP6-deficient spermatocytes were arrested at the pachytene stage and defects in DSB repair and crossover formation were observed, indicating that PP6 facilitated meiotic double-stranded breaks (DSB) repair. Further investigations revealed that depletion of PP6 in the germ cells affected chromatin relaxation, which was dependent on MAPK pathway activity, consequently preventing programmed DSB repair factors from being recruited to proper positions on the chromatin. Taken together, our results demonstrate that PP6 has an important role in meiotic recombination and male fertility.
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Affiliation(s)
- Wen-Long Lei
- State Key Laboratory of Stem Cell and Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, 100101, China.,University of Chinese Academy of Sciences, Beijing, 100101, China
| | - Feng Han
- State Key Laboratory of Stem Cell and Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, 100101, China.,Key Laboratory for Major Obstetric Diseases of Guangdong Province, Key Laboratory of Reproduction and Genetics of Guangdong Higher Education Institutes, The Third Affiliated Hospital of Guangzhou Medical University, Guangzhou, 510150, China
| | - Meng-Wen Hu
- State Key Laboratory of Stem Cell and Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, 100101, China
| | - Qiu-Xia Liang
- State Key Laboratory of Stem Cell and Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, 100101, China.,Department of Reproductive Medicine, Peking University Shenzhen Hospital, Shenzhen, Guangdong, 518036, China
| | - Tie-Gang Meng
- State Key Laboratory of Stem Cell and Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, 100101, China.,University of Chinese Academy of Sciences, Beijing, 100101, China
| | - Qian Zhou
- State Key Laboratory of Stem Cell and Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, 100101, China.,University of Chinese Academy of Sciences, Beijing, 100101, China
| | - Ying-Chun Ouyang
- State Key Laboratory of Stem Cell and Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, 100101, China
| | - Yi Hou
- State Key Laboratory of Stem Cell and Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, 100101, China
| | - Heide Schatten
- Department of Veterinary Pathobiology, University of Missouri, Columbia, MO, 65211, USA
| | - Zhen-Bo Wang
- State Key Laboratory of Stem Cell and Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, 100101, China. .,University of Chinese Academy of Sciences, Beijing, 100101, China.
| | - Qing-Yuan Sun
- State Key Laboratory of Stem Cell and Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, 100101, China. .,University of Chinese Academy of Sciences, Beijing, 100101, China.
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20
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Multiple Functions of the Essential Gene PpV in Drosophila Early Development. G3-GENES GENOMES GENETICS 2019; 9:3583-3593. [PMID: 31484673 PMCID: PMC6829155 DOI: 10.1534/g3.119.400662] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Protein phosphatase V (PpV) encodes the Drosophila homolog of the evolutionarily conserved Protein Phosphatase 6 (PP6). The physiological and developmental functions of PpV/PP6 have not been well characterized due to lack of a genetically defined mutant. Here, we identified a PpV non-sense mutation and describe multiple mutant phenotypes in oogenesis and early embryogenesis. Specifically, we found that the defects in chromosome segregation during nuclear cycles are related to AuroraA function, which is consistent with the interaction of PP6 and AuroraA in mammalian cells. Surprisingly, we also identified a PpV function specifically in blastoderm cell cycle but not in cell proliferation in the follicle epithelium or larval wing imaginal discs. Embryos from PpV germline clones frequently undergo an extra nuclear division cycle. By epistasis analysis, we found that PpV functions in parallel with tribbles, but independently of auroraA for the remodeling of the nuclear cycles. Taken together, this study reports novel developmental functions of PpV and provides a framework for further genetic analysis under physiological conditions.
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21
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Crncec A, Hochegger H. Triggering mitosis. FEBS Lett 2019; 593:2868-2888. [PMID: 31602636 DOI: 10.1002/1873-3468.13635] [Citation(s) in RCA: 45] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2019] [Revised: 10/07/2019] [Accepted: 10/07/2019] [Indexed: 12/28/2022]
Abstract
Entry into mitosis is triggered by the activation of cyclin-dependent kinase 1 (Cdk1). This simple reaction rapidly and irreversibly sets the cell up for division. Even though the core step in triggering mitosis is so simple, the regulation of this cellular switch is highly complex, involving a large number of interconnected signalling cascades. We do have a detailed knowledge of most of the components of this network, but only a poor understanding of how they work together to create a precise and robust system that ensures that mitosis is triggered at the right time and in an orderly fashion. In this review, we will give an overview of the literature that describes the Cdk1 activation network and then address questions relating to the systems biology of this switch. How is the timing of the trigger controlled? How is mitosis insulated from interphase? What determines the sequence of events, following the initial trigger of Cdk1 activation? Which elements ensure robustness in the timing and execution of the switch? How has this system been adapted to the high levels of replication stress in cancer cells?
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Affiliation(s)
- Adrijana Crncec
- Genome Damage and Stability Centre, University of Sussex, Brighton, UK
| | - Helfrid Hochegger
- Genome Damage and Stability Centre, University of Sussex, Brighton, UK
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22
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Swingle MR, Honkanen RE. Inhibitors of Serine/Threonine Protein Phosphatases: Biochemical and Structural Studies Provide Insight for Further Development. Curr Med Chem 2019; 26:2634-2660. [PMID: 29737249 PMCID: PMC10013172 DOI: 10.2174/0929867325666180508095242] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2017] [Revised: 02/05/2018] [Accepted: 03/29/2018] [Indexed: 11/22/2022]
Abstract
BACKGROUND The reversible phosphorylation of proteins regulates many key functions in eukaryotic cells. Phosphorylation is catalyzed by protein kinases, with the majority of phosphorylation occurring on side chains of serine and threonine residues. The phosphomonoesters generated by protein kinases are hydrolyzed by protein phosphatases. In the absence of a phosphatase, the half-time for the hydrolysis of alkyl phosphate dianions at 25º C is over 1 trillion years; knon ~2 x 10-20 sec-1. Therefore, ser/thr phosphatases are critical for processes controlled by reversible phosphorylation. METHODS This review is based on the literature searched in available databases. We compare the catalytic mechanism of PPP-family phosphatases (PPPases) and the interactions of inhibitors that target these enzymes. RESULTS PPPases are metal-dependent hydrolases that enhance the rate of hydrolysis ([kcat/kM]/knon ) by a factor of ~1021, placing them among the most powerful known catalysts on earth. Biochemical and structural studies indicate that the remarkable catalytic proficiencies of PPPases are achieved by 10 conserved amino acids, DXH(X)~26DXXDR(X)~20- 26NH(X)~50H(X)~25-45R(X)~30-40H. Six act as metal-coordinating residues. Four position and orient the substrate phosphate. Together, two metal ions and the 10 catalytic residues position the phosphoryl group and an activated bridging water/hydroxide nucleophile for an inline attack upon the substrate phosphorous atom. The PPPases are conserved among species, and many structurally diverse natural toxins co-evolved to target these enzymes. CONCLUSION Although the catalytic site is conserved, opportunities for the development of selective inhibitors of this important group of metalloenzymes exist.
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Affiliation(s)
- Mark R Swingle
- Department of Biochemistry and Molecular Biology, University of South Alabama, Mobile AL 36688, United States
| | - Richard E Honkanen
- Department of Biochemistry and Molecular Biology, University of South Alabama, Mobile AL 36688, United States
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23
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Ohama T. The multiple functions of protein phosphatase 6. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2019; 1866:74-82. [DOI: 10.1016/j.bbamcr.2018.07.015] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/27/2018] [Revised: 06/21/2018] [Accepted: 07/18/2018] [Indexed: 12/26/2022]
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24
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Quantitative conformational profiling of kinase inhibitors reveals origins of selectivity for Aurora kinase activation states. Proc Natl Acad Sci U S A 2018; 115:E11894-E11903. [PMID: 30518564 PMCID: PMC6304972 DOI: 10.1073/pnas.1811158115] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Many drugs trigger changes to the structure of their target receptor upon binding. These conformational effects are thought to be an essential part of molecular recognition but have proven challenging to quantify. Using a high-throughput method for tracking structural changes in a protein kinase in solution, we discovered that many clinically important cancer drugs trigger substantial structural changes to their target protein kinase Aurora A, and that these effects systematically account for the ability of the drugs to differentiate between different biochemical forms of Aurora A. The results provide insight into mechanisms of drug selectivity and suggest strategies for tailoring inhibitors to target certain cancers in which Aurora A has been dysregulated in different ways. Protein kinases undergo large-scale structural changes that tightly regulate function and control recognition by small-molecule inhibitors. Methods for quantifying the conformational effects of inhibitors and linking them to an understanding of selectivity patterns have long been elusive. We have developed an ultrafast time-resolved fluorescence methodology that tracks structural movements of the kinase activation loop in solution with angstrom-level precision, and can resolve multiple structural states and quantify conformational shifts between states. Profiling a panel of clinically relevant Aurora kinase inhibitors against the mitotic kinase Aurora A revealed a wide range of conformational preferences, with all inhibitors promoting either the active DFG-in state or the inactive DFG-out state, but to widely differing extents. Remarkably, these conformational preferences explain broad patterns of inhibitor selectivity across different activation states of Aurora A, with DFG-out inhibitors preferentially binding Aurora A activated by phosphorylation on the activation loop, which dynamically samples the DFG-out state, and DFG-in inhibitors binding preferentially to Aurora A constrained in the DFG-in state by its allosteric activator Tpx2. The results suggest that many inhibitors currently in clinical development may be capable of differentiating between Aurora A signaling pathways implicated in normal mitotic control and in melanoma, neuroblastoma, and prostate cancer. The technology is applicable to a wide range of clinically important kinases and could provide a wealth of valuable structure–activity information for the development of inhibitors that exploit differences in conformational dynamics to achieve enhanced selectivity.
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25
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Nilsson J. Protein phosphatases in the regulation of mitosis. J Cell Biol 2018; 218:395-409. [PMID: 30446607 PMCID: PMC6363451 DOI: 10.1083/jcb.201809138] [Citation(s) in RCA: 67] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2018] [Revised: 10/29/2018] [Accepted: 10/29/2018] [Indexed: 12/15/2022] Open
Abstract
The accurate segregation of genetic material to daughter cells during mitosis depends on the precise coordination and regulation of hundreds of proteins by dynamic phosphorylation. Mitotic kinases are major regulators of protein function, but equally important are protein phosphatases that balance their actions, their coordinated activity being essential for accurate chromosome segregation. Phosphoprotein phosphatases (PPPs) that dephosphorylate phosphoserine and phosphothreonine residues are increasingly understood as essential regulators of mitosis. In contrast to kinases, the lack of a pronounced peptide-binding cleft on the catalytic subunit of PPPs suggests that these enzymes are unlikely to be specific. However, recent exciting insights into how mitotic PPPs recognize specific substrates have revealed that they are as specific as kinases. Furthermore, the activities of PPPs are tightly controlled at many levels to ensure that they are active only at the proper time and place. Here, I will discuss substrate selection and regulation of mitotic PPPs focusing mainly on animal cells and explore how these actions control mitosis, as well as important unanswered questions.
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Affiliation(s)
- Jakob Nilsson
- Novo Nordisk Foundation Center for Protein Research, University of Copenhagen, Copenhagen, Denmark
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26
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The multifaceted allosteric regulation of Aurora kinase A. Biochem J 2018; 475:2025-2042. [PMID: 29946042 PMCID: PMC6018539 DOI: 10.1042/bcj20170771] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2018] [Revised: 04/26/2018] [Accepted: 05/01/2018] [Indexed: 12/22/2022]
Abstract
The protein kinase Aurora A (AurA) is essential for the formation of bipolar mitotic spindles in all eukaryotic organisms. During spindle assembly, AurA is activated through two different pathways operating at centrosomes and on spindle microtubules. Recent studies have revealed that these pathways operate quite differently at the molecular level, activating AurA through multifaceted changes to the structure and dynamics of the kinase domain. These advances provide an intimate atomic-level view of the finely tuned regulatory control operating in protein kinases, revealing mechanisms of allosteric cooperativity that provide graded levels of regulatory control, and a previously unanticipated mechanism for kinase activation by phosphorylation on the activation loop. Here, I review these advances in our understanding of AurA function, and discuss their implications for the use of allosteric small molecule inhibitors to address recently discovered roles of AurA in neuroblastoma, prostate cancer and melanoma.
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27
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Kurosawa K, Inoue Y, Kakugawa Y, Yamashita Y, Kanazawa K, Kishimoto K, Nomura M, Momoi Y, Sato I, Chiba N, Suzuki M, Ogoh H, Yamada H, Miura K, Watanabe T, Tanuma N, Tachi M, Shima H. Loss of protein phosphatase 6 in mouse keratinocytes enhances K-ras G12D -driven tumor promotion. Cancer Sci 2018; 109:2178-2187. [PMID: 29758119 PMCID: PMC6029815 DOI: 10.1111/cas.13638] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2018] [Revised: 05/03/2018] [Accepted: 05/08/2018] [Indexed: 01/17/2023] Open
Abstract
Here, we address the function of protein phosphatase 6 (PP6) loss on K‐ras‐initiated tumorigenesis in keratinocytes. To do so, we developed tamoxifen‐inducible double mutant (K‐rasG12D‐expressing and Ppp6c‐deficient) mice in which K‐rasG12D expression is driven by the cytokeratin 14 (K14) promoter. Doubly‐mutant mice showed early onset tumor formation in lips, nipples, external genitalia, anus and palms, and had to be killed by 3 weeks after induction by tamoxifen, while comparably‐treated K‐rasG12D‐expressing mice did not. H&E‐staining of lip tumors before euthanasia revealed that all were papillomas, some containing focal squamous cell carcinomas. Immunohistochemical analysis of lips of doubly‐mutant vs K‐rasG12D mice revealed that cell proliferation and cell size increased approximately 2‐fold relative to K‐rasG12D‐expressing mutants, and epidermal thickness of lip tissue greatly increased relative to that seen in K‐rasG12D‐only mice. Moreover, AKT phosphorylation increased in K‐rasG12D‐expressing/Ppp6c‐deficient cells, as did phosphorylation of the downstream effectors 4EBP1, S6 and GSK3, suggesting that protein synthesis and survival signals are enhanced in lip tissues of doubly‐mutant mice. Finally, increased numbers of K14‐positive cells were present in the suprabasal layer of doubly‐mutant mice, indicating abnormal keratinocyte differentiation, and γH2AX‐positive cells accumulated, indicating perturbed DNA repair. Taken together, Ppp6c deficiency enhances K‐rasG12D‐dependent tumor promotion.
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Affiliation(s)
- Koreyuki Kurosawa
- Division of Cancer Chemotherapy, Miyagi Cancer Center Research Institute, Miyagi, Japan.,Department of Plastic and Reconstructive Surgery, Tohoku University Hospital, Miyagi, Japan
| | - Yui Inoue
- Division of Cancer Chemotherapy, Miyagi Cancer Center Research Institute, Miyagi, Japan
| | - Yoichiro Kakugawa
- Division of Cancer Chemotherapy, Miyagi Cancer Center Research Institute, Miyagi, Japan
| | - Yoji Yamashita
- Division of Cancer Chemotherapy, Miyagi Cancer Center Research Institute, Miyagi, Japan
| | - Kosuke Kanazawa
- Division of Cancer Chemotherapy, Miyagi Cancer Center Research Institute, Miyagi, Japan
| | - Kazuhiro Kishimoto
- Division of Cancer Chemotherapy, Miyagi Cancer Center Research Institute, Miyagi, Japan
| | - Miyuki Nomura
- Division of Cancer Chemotherapy, Miyagi Cancer Center Research Institute, Miyagi, Japan
| | - Yuki Momoi
- Division of Cancer Chemotherapy, Miyagi Cancer Center Research Institute, Miyagi, Japan
| | - Ikuro Sato
- Division of Pathology, Miyagi Cancer Center, Miyagi, Japan
| | - Natsuko Chiba
- Department of Cancer Biology, Institute of Development, Aging and Cancer, Tohoku University, Miyagi, Japan
| | - Mai Suzuki
- Department of Biological Science, Graduate School of Humanities and Sciences, Nara Women's University, Nara, Japan
| | - Honami Ogoh
- Department of Biological Science, Graduate School of Humanities and Sciences, Nara Women's University, Nara, Japan
| | - Hidekazu Yamada
- Division of Cancer Chemotherapy, Miyagi Cancer Center Research Institute, Miyagi, Japan
| | - Koh Miura
- Division of Cancer Chemotherapy, Miyagi Cancer Center Research Institute, Miyagi, Japan
| | - Toshio Watanabe
- Department of Biological Science, Graduate School of Humanities and Sciences, Nara Women's University, Nara, Japan
| | - Nobuhiro Tanuma
- Division of Cancer Chemotherapy, Miyagi Cancer Center Research Institute, Miyagi, Japan.,Division of Cancer Molecular Biology, Tohoku University School of Medicine, Miyagi, Japan
| | - Masahiro Tachi
- Department of Plastic and Reconstructive Surgery, Tohoku University Hospital, Miyagi, Japan
| | - Hiroshi Shima
- Division of Cancer Chemotherapy, Miyagi Cancer Center Research Institute, Miyagi, Japan.,Division of Cancer Molecular Biology, Tohoku University School of Medicine, Miyagi, Japan
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28
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Ruff EF, Muretta JM, Thompson AR, Lake EW, Cyphers S, Albanese SK, Hanson SM, Behr JM, Thomas DD, Chodera JD, Levinson NM. A dynamic mechanism for allosteric activation of Aurora kinase A by activation loop phosphorylation. eLife 2018; 7:32766. [PMID: 29465396 PMCID: PMC5849412 DOI: 10.7554/elife.32766] [Citation(s) in RCA: 48] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2017] [Accepted: 02/19/2018] [Indexed: 12/12/2022] Open
Abstract
Many eukaryotic protein kinases are activated by phosphorylation on a specific conserved residue in the regulatory activation loop, a post-translational modification thought to stabilize the active DFG-In state of the catalytic domain. Here we use a battery of spectroscopic methods that track different catalytic elements of the kinase domain to show that the ~100 fold activation of the mitotic kinase Aurora A (AurA) by phosphorylation occurs without a population shift from the DFG-Out to the DFG-In state, and that the activation loop of the activated kinase remains highly dynamic. Instead, molecular dynamics simulations and electron paramagnetic resonance experiments show that phosphorylation triggers a switch within the DFG-In subpopulation from an autoinhibited DFG-In substate to an active DFG-In substate, leading to catalytic activation. This mechanism raises new questions about the functional role of the DFG-Out state in protein kinases. The transfer of phosphate groups onto proteins (protein phosphorylation) is one of the most important methods used to send signals inside cells. The enzymes that catalyze this process, called protein kinases, are themselves controlled by the phosphorylation of a flexible region called the activation loop. For many years it had been thought that the purpose of activation loop phosphorylation was to clamp the otherwise flexible activation loop in an active state that allows molecules that need to be phosphorylated to bind to the kinase. This assumption was based on static pictures of protein kinases obtained by X-ray crystallography, in which individual states are trapped and visualized in a crystal lattice. However, new methods and approaches now mean it is possible to visualize how the position of the activation loop changes as it moves in solution. By applying these techniques, Ruff et al. show that the static model is incorrect in a protein kinase called Aurora A. In this enzyme, the phosphorylated activation loop continues to switch back and forth between active and inactive states. Phosphorylation instead enhances the catalytic activity of the active state. Aurora A regulates several important steps in cell division, and plays important roles in several kinds of cancer. The discovery that activated forms of Aurora A can have different dynamic properties raises the possibility that inhibitor molecules could be designed to exploit these differences and block specific activities of Aurora A in cancer cells. To realize this goal we need to better understand how a kinase switching between active and inactive states affects the ability of inhibitors to interact with it.
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Affiliation(s)
- Emily F Ruff
- Department of Pharmacology, University of Minnesota, Minneapolis, United States
| | - Joseph M Muretta
- Department of Biochemistry, Molecular Biology, and Biophysics, University of Minnesota, Minneapolis, United States
| | - Andrew R Thompson
- Department of Biochemistry, Molecular Biology, and Biophysics, University of Minnesota, Minneapolis, United States
| | - Eric W Lake
- Department of Pharmacology, University of Minnesota, Minneapolis, United States
| | - Soreen Cyphers
- Department of Pharmacology, University of Minnesota, Minneapolis, United States
| | - Steven K Albanese
- Computational and Systems Biology Program, Sloan Kettering Institute, Memorial Sloan Kettering Cancer Center, New York, United States.,Gerstner Sloan Kettering Graduate School, Memorial Sloan Kettering Cancer Center, New York, United States
| | - Sonya M Hanson
- Computational and Systems Biology Program, Sloan Kettering Institute, Memorial Sloan Kettering Cancer Center, New York, United States
| | - Julie M Behr
- Computational and Systems Biology Program, Sloan Kettering Institute, Memorial Sloan Kettering Cancer Center, New York, United States.,Tri-Institutional Program in Computational Biology and Medicine, Weill Cornell Medical College, New York, United States
| | - David D Thomas
- Department of Biochemistry, Molecular Biology, and Biophysics, University of Minnesota, Minneapolis, United States
| | - John D Chodera
- Computational and Systems Biology Program, Sloan Kettering Institute, Memorial Sloan Kettering Cancer Center, New York, United States
| | - Nicholas M Levinson
- Department of Pharmacology, University of Minnesota, Minneapolis, United States
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29
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Pellegrini C, Maturo MG, Di Nardo L, Ciciarelli V, Gutiérrez García-Rodrigo C, Fargnoli MC. Understanding the Molecular Genetics of Basal Cell Carcinoma. Int J Mol Sci 2017; 18:ijms18112485. [PMID: 29165358 PMCID: PMC5713451 DOI: 10.3390/ijms18112485] [Citation(s) in RCA: 112] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2017] [Revised: 11/12/2017] [Accepted: 11/21/2017] [Indexed: 12/20/2022] Open
Abstract
Basal cell carcinoma (BCC) is the most common human cancer and represents a growing public health care problem. Several tumor suppressor genes and proto-oncogenes have been implicated in BCC pathogenesis, including the key components of the Hedgehog pathway, PTCH1 and SMO, the TP53 tumor suppressor, and members of the RAS proto-oncogene family. Aberrant activation of the Hedgehog pathway represents the molecular driver in basal cell carcinoma pathogenesis, with the majority of BCCs carrying somatic point mutations, mainly ultraviolet (UV)-induced, and/or copy-loss of heterozygosis in the PTCH1 gene. Recent advances in sequencing technology allowed genome-scale approaches to mutation discovery, identifying new genes and pathways potentially involved in BCC carcinogenesis. Mutational and functional analysis suggested PTPN14 and LATS1, both effectors of the Hippo–YAP pathway, and MYCN as new BCC-associated genes. In addition, emerging reports identified frequent non-coding mutations within the regulatory promoter sequences of the TERT and DPH3-OXNAD1 genes. Thus, it is clear that a more complex genetic network of cancer-associated genes than previously hypothesized is involved in BCC carcinogenesis, with a potential impact on the development of new molecular targeted therapies. This article reviews established knowledge and new hypotheses regarding the molecular genetics of BCC pathogenesis.
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Affiliation(s)
- Cristina Pellegrini
- Department of Dermatology, Department of Biotechnological and Applied Clinical Sciences, University of L'Aquila, 67100 L'Aquila, Italy.
| | - Maria Giovanna Maturo
- Department of Dermatology, Department of Biotechnological and Applied Clinical Sciences, University of L'Aquila, 67100 L'Aquila, Italy.
| | - Lucia Di Nardo
- Department of Dermatology, Department of Biotechnological and Applied Clinical Sciences, University of L'Aquila, 67100 L'Aquila, Italy.
| | - Valeria Ciciarelli
- Department of Dermatology, Department of Biotechnological and Applied Clinical Sciences, University of L'Aquila, 67100 L'Aquila, Italy.
| | - Carlota Gutiérrez García-Rodrigo
- Department of Dermatology, Department of Biotechnological and Applied Clinical Sciences, University of L'Aquila, 67100 L'Aquila, Italy.
| | - Maria Concetta Fargnoli
- Department of Dermatology, Department of Biotechnological and Applied Clinical Sciences, University of L'Aquila, 67100 L'Aquila, Italy.
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30
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Tan P, He L, Cui J, Qian C, Cao X, Lin M, Zhu Q, Li Y, Xing C, Yu X, Wang HY, Wang RF. Assembly of the WHIP-TRIM14-PPP6C Mitochondrial Complex Promotes RIG-I-Mediated Antiviral Signaling. Mol Cell 2017; 68:293-307.e5. [PMID: 29053956 DOI: 10.1016/j.molcel.2017.09.035] [Citation(s) in RCA: 52] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2017] [Revised: 08/09/2017] [Accepted: 09/25/2017] [Indexed: 01/30/2023]
Abstract
Mitochondrial antiviral signaling platform protein (MAVS) acts as a central hub for RIG-I receptor proximal signal propagation. However, key components in the assembly of the MAVS mitochondrial platform that promote RIG-I mitochondrial localization and optimal activation are still largely undefined. Employing pooled RNAi and yeast two-hybrid screenings, we report that the mitochondrial adaptor protein tripartite motif (TRIM)14 provides a docking platform for the assembly of the mitochondrial signaling complex required for maximal activation of RIG-I-mediated signaling, consisting of WHIP and protein phosphatase PPP6C. Following viral infection, the ubiquitin-binding domain in WHIP bridges RIG-I with MAVS by binding to polyUb chains of RIG-I at lysine 164. The ATPase domain in WHIP contributes to stabilization of the RIG-I-dsRNA interaction. Moreover, phosphatase PPP6C is responsible for RIG-I dephosphorylation. Together, our findings define the WHIP-TRIM14-PPP6C mitochondrial signalosome required for RIG-I-mediated innate antiviral immunity.
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Affiliation(s)
- Peng Tan
- Institute of Biosciences and Technology, College of Medicine, Texas A&M University, Houston, TX 77030, USA; Center for Inflammation and Epigenetics, Houston Methodist Research Institute, Houston, TX 77030, USA
| | - Lian He
- Institute of Biosciences and Technology, College of Medicine, Texas A&M University, Houston, TX 77030, USA
| | - Jun Cui
- Key Laboratory of Gene Engineering of the Ministry of Education, State Key Laboratory of Biocontrol, College of Life Sciences, Collaborative Innovation Center of Cancer Medicine, Sun Yat-sen University, Guangzhou 510275, China
| | - Chen Qian
- Center for Inflammation and Epigenetics, Houston Methodist Research Institute, Houston, TX 77030, USA
| | - Xin Cao
- Center for Inflammation and Epigenetics, Houston Methodist Research Institute, Houston, TX 77030, USA
| | - Meng Lin
- Center for Inflammation and Epigenetics, Houston Methodist Research Institute, Houston, TX 77030, USA
| | - Qingyuan Zhu
- Center for Inflammation and Epigenetics, Houston Methodist Research Institute, Houston, TX 77030, USA
| | - Yinyin Li
- Institute of Biosciences and Technology, College of Medicine, Texas A&M University, Houston, TX 77030, USA; Center for Inflammation and Epigenetics, Houston Methodist Research Institute, Houston, TX 77030, USA
| | - Changsheng Xing
- Center for Inflammation and Epigenetics, Houston Methodist Research Institute, Houston, TX 77030, USA
| | - Xiao Yu
- Center for Inflammation and Epigenetics, Houston Methodist Research Institute, Houston, TX 77030, USA
| | - Helen Y Wang
- Center for Inflammation and Epigenetics, Houston Methodist Research Institute, Houston, TX 77030, USA.
| | - Rong-Fu Wang
- Institute of Biosciences and Technology, College of Medicine, Texas A&M University, Houston, TX 77030, USA; Center for Inflammation and Epigenetics, Houston Methodist Research Institute, Houston, TX 77030, USA; Department of Microbiology and Immunology, Weill Cornell Medical College, Cornell University, New York, NY 10065, USA.
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31
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Amplified centrosomes and mitotic index display poor concordance between patient tumors and cultured cancer cells. Sci Rep 2017; 7:43984. [PMID: 28272508 PMCID: PMC5341055 DOI: 10.1038/srep43984] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2015] [Accepted: 02/02/2017] [Indexed: 12/13/2022] Open
Abstract
Centrosome aberrations (CA) and abnormal mitoses are considered beacons of malignancy. Cancer cell doubling times in patient tumors are longer than in cultures, but differences in CA between tumors and cultured cells are uncharacterized. We compare mitoses and CA in patient tumors, xenografts, and tumor cell lines. We find that mitoses are rare in patient tumors compared with xenografts and cell lines. Contrastingly, CA is more extensive in patient tumors and xenografts (~35–50% cells) than cell lines (~5–15%), although CA declines in patient-derived tumor cells over time. Intratumoral hypoxia may explain elevated CA in vivo because exposure of cultured cells to hypoxia or mimicking hypoxia pharmacologically or genetically increases CA, and HIF-1α and hypoxic gene signature expression correlate with CA and centrosomal gene signature expression in breast tumors. These results highlight the importance of utilizing low-passage-number patient-derived cell lines in studying CA to more faithfully recapitulate in vivo cellular phenotypes.
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32
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A water-mediated allosteric network governs activation of Aurora kinase A. Nat Chem Biol 2017; 13:402-408. [PMID: 28166210 DOI: 10.1038/nchembio.2296] [Citation(s) in RCA: 45] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2016] [Accepted: 12/01/2016] [Indexed: 12/23/2022]
Abstract
The catalytic activity of many protein kinases is controlled by conformational changes of a conserved Asp-Phe-Gly (DFG) motif. We used an infrared probe to track the DFG motif of the mitotic kinase Aurora A (AurA) and found that allosteric activation by the spindle-associated protein Tpx2 involves an equilibrium shift toward the active DFG-in state. Förster resonance energy transfer experiments show that the activation loop undergoes a nanometer-scale movement that is tightly coupled to the DFG equilibrium. Tpx2 further activates AurA by stabilizing a water-mediated allosteric network that links the C-helix to the active site through an unusual polar residue in the regulatory spine. The polar spine residue and water network of AurA are essential for phosphorylation-driven activation, but an alternative form of the water network found in related kinases can support Tpx2-driven activation, suggesting that variations in the water-mediated hydrogen bond network mediate regulatory diversification in protein kinases.
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33
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Madhunapantula SV, Robertson GP. Targeting protein kinase-b3 (akt3) signaling in melanoma. Expert Opin Ther Targets 2017; 21:273-290. [PMID: 28064546 DOI: 10.1080/14728222.2017.1279147] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
INTRODUCTION Deregulated Akt activity leading to apoptosis inhibition, enhanced proliferation and drug resistance has been shown to be responsible for 35-70% of advanced metastatic melanomas. Of the three isoforms, the majority of melanomas have elevated Akt3 expression and activity. Hence, potent inhibitors targeting Akt are urgently required, which is possible only if (a) the factors responsible for the failure of Akt inhibitors in clinical trials is known; and (b) the information pertaining to synergistically acting targeted therapeutics is available. Areas covered: This review provides a brief introduction of the PI3K-Akt signaling pathway and its role in melanoma development. In addition, the functional role of key Akt pathway members such as PRAS40, GSK3 kinases, WEE1 kinase in melanoma development are discussed together with strategies to modulate these targets. Efficacy and safety of Akt inhibitors is also discussed. Finally, the mechanism(s) through which Akt leads to drug resistance is discussed in this expert opinion review. Expert opinion: Even though Akt play key roles in melanoma tumor progression, cell survival and drug resistance, many gaps still exist that require further understanding of Akt functions, especially in the (a) metastatic spread; (b) circulating melanoma cells survival; and
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Affiliation(s)
- SubbaRao V Madhunapantula
- a Center of Excellence in Molecular Biology and Regenerative Medicine (CEMR), Department of Biochemistry , JSS Medical College, Jagadguru Sri Shivarathreeshwara University (Accredited 'A' Grade by NAAC and Ranked 35 by National Institutional Ranking Framework (NIRF)-2015, Ministry of Human Resource Development, Government of India) , Mysuru , India
| | - Gavin P Robertson
- b Department of Pharmacology , The Pennsylvania State University College of Medicine , Hershey , PA , USA.,c Department of Pathology , The Pennsylvania State University College of Medicine , Hershey , PA , USA.,d Department of Dermatology , The Pennsylvania State University College of Medicine , Hershey , PA , USA.,e Department of Surgery , The Pennsylvania State University College of Medicine , Hershey , PA , USA.,f The Melanoma Center , The Pennsylvania State University College of Medicine , Hershey , PA , USA.,g The Melanoma Therapeutics Program , The Pennsylvania State University College of Medicine , Hershey , PA , USA
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34
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Hu MW, Meng TG, Jiang ZZ, Dong MZ, Schatten H, Xu X, Wang ZB, Sun QY. Protein Phosphatase 6 Protects Prophase I-Arrested Oocytes by Safeguarding Genomic Integrity. PLoS Genet 2016; 12:e1006513. [PMID: 27930667 PMCID: PMC5179128 DOI: 10.1371/journal.pgen.1006513] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2016] [Revised: 12/22/2016] [Accepted: 11/29/2016] [Indexed: 12/21/2022] Open
Abstract
Mammalian oocytes are arrested at prophase of the first meiotic division in the primordial follicle pool for months, even years, after birth depending on species, and only a limited number of oocytes resume meiosis, complete maturation, and ovulate with each reproductive cycle. We recently reported that protein phosphatase 6 (PP6), a member of the PP2A-like subfamily, which accounts for cellular serine/threonine phosphatase activity, functions in completing the second meiosis. Here, we generated mutant mice with a specific deletion of Ppp6c in oocytes from the primordial follicle stage by crossing Ppp6cF/F mice with Gdf9-Cre mice and found that Ppp6cF/F; GCre+ mice are infertile. Depletion of PP6c caused folliculogenesis defects and germ cell loss independent of the traditional AKT/mTOR pathway, but due to persistent phosphorylation of H2AX (a marker of double strand breaks), increased susceptibility to DNA damage and defective DNA repair, which led to massive oocyte elimination and eventually premature ovarian failure (POF). Our findings uncover an important role for PP6 as an indispensable guardian of genomic integrity of the lengthy prophase I oocyte arrest, maintenance of primordial follicle pool, and thus female fertility. Formation of haploid gametes from diploid germ cells requires a specialized reductive cell division known as meiosis. In contrast to male meiosis that takes place continuously, a unique feature of female meiosis in mammals is the long arrest in meiosis I, which lasts up to 50 years in humans. Because the size of the germ cell pool determines the reproductive lifespan of females, it is important to discover mechanisms preserving the germ cell pool during the lengthy meiotic arrest. In this study, we examined the physiological role of a member of the PP2A-like serine/threonine phosphatase subfamily, protein phosphatase 6, in mouse oocytes during ovarian follicular development. This is the first study linking PP6 to the maintenance of the female germ cell pool and fertility. We find PP6 is an indispensable protector of arrested oocytes by safeguarding genomic integrity during their dormancy in the mouse ovary.
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Affiliation(s)
- Meng-Wen Hu
- State Key Laboratory of Stem Cell and Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, China
| | - Tie-Gang Meng
- State Key Laboratory of Stem Cell and Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, China.,University of Chinese Academy of Sciences, Beijing, China
| | - Zong-Zhe Jiang
- State Key Laboratory of Stem Cell and Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, China
| | - Ming-Zhe Dong
- State Key Laboratory of Stem Cell and Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, China
| | - Heide Schatten
- Department of Veterinary Pathobiology, University of Missouri, Columbia, MO, United States of America
| | - Xingzhi Xu
- Beijing Key Laboratory of DNA Damage Response and College of Life Sciences, Capital Normal University, Beijing, China
| | - Zhen-Bo Wang
- State Key Laboratory of Stem Cell and Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, China.,University of Chinese Academy of Sciences, Beijing, China
| | - Qing-Yuan Sun
- State Key Laboratory of Stem Cell and Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, China.,University of Chinese Academy of Sciences, Beijing, China
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Guo R, Wang X, Chou MM, Asmann Y, Wenger DE, Al-Ibraheemi A, Molavi DW, Aboulafia A, Jin L, Fritchie K, Oliveira JL, Jenkins RB, Westendorf JJ, Dong J, Oliveira AM. PPP6R3-USP6amplification: Novel oncogenic mechanism in malignant nodular fasciitis. Genes Chromosomes Cancer 2016; 55:640-9. [DOI: 10.1002/gcc.22366] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2016] [Revised: 04/19/2016] [Accepted: 04/20/2016] [Indexed: 02/06/2023] Open
Affiliation(s)
- Ruifeng Guo
- Department of Laboratory Medicine and Pathology; Mayo Clinic; Rochester MN
- Department of Dermatology; Mayo Clinic; Rochester MN
| | - Xiaoke Wang
- Department of Laboratory Medicine and Pathology; Mayo Clinic; Rochester MN
| | - Margaret M Chou
- Department of Pathology and Laboratory Medicine; University of Pennsylvania School of Medicine; Philadelphia PA
| | - Yan Asmann
- Department of Bioinformatics; Mayo Clinic; Rochester MN
| | - Doris E. Wenger
- Department of Diagnostic Radiology; Mayo Clinic; Rochester MN
| | - Alyaa Al-Ibraheemi
- Department of Laboratory Medicine and Pathology; Mayo Clinic; Rochester MN
| | - Diana W Molavi
- Department of Pathology; Sinai Hospital of Baltimore; Baltimore MD
| | - Albert Aboulafia
- Department of Orthopaedic; Onology Medstar Franklin Square Hospital; Baltimore MD
| | - Long Jin
- Department of Laboratory Medicine and Pathology; Mayo Clinic; Rochester MN
| | - Karen Fritchie
- Department of Laboratory Medicine and Pathology; Mayo Clinic; Rochester MN
| | | | - Robert B. Jenkins
- Department of Laboratory Medicine and Pathology; Mayo Clinic; Rochester MN
| | | | - Jie Dong
- Department of Laboratory Medicine and Pathology; Mayo Clinic; Rochester MN
| | - Andre M. Oliveira
- Department of Laboratory Medicine and Pathology; Mayo Clinic; Rochester MN
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36
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Spoerri L, Brooks K, Chia K, Grossman G, Ellis JJ, Dahmer-Heath M, Škalamera D, Pavey S, Burmeister B, Gabrielli B. A novel ATM-dependent checkpoint defect distinct from loss of function mutation promotes genomic instability in melanoma. Pigment Cell Melanoma Res 2016; 29:329-39. [PMID: 26854966 DOI: 10.1111/pcmr.12466] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2015] [Accepted: 02/03/2016] [Indexed: 11/29/2022]
Abstract
Melanomas have high levels of genomic instability that can contribute to poor disease prognosis. Here, we report a novel defect of the ATM-dependent cell cycle checkpoint in melanoma cell lines that promotes genomic instability. In defective cells, ATM signalling to CHK2 is intact, but the cells are unable to maintain the cell cycle arrest due to elevated PLK1 driving recovery from the arrest. Reducing PLK1 activity recovered the ATM-dependent checkpoint arrest, and over-expressing PLK1 was sufficient to overcome the checkpoint arrest and increase genomic instability. Loss of the ATM-dependent checkpoint did not affect sensitivity to ionizing radiation demonstrating that this defect is distinct from ATM loss of function mutations. The checkpoint defective melanoma cell lines over-express PLK1, and a significant proportion of melanomas have high levels of PLK1 over-expression suggesting this defect is a common feature of melanomas. The inability of ATM to impose a cell cycle arrest in response to DNA damage increases genomic instability. This work also suggests that the ATM-dependent checkpoint arrest is likely to be defective in a higher proportion of cancers than previously expected.
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Affiliation(s)
- Loredana Spoerri
- The University of Queensland Diamantina Institute, The University of Queensland, Brisbane, Qld, Australia
| | - Kelly Brooks
- The University of Queensland Diamantina Institute, The University of Queensland, Brisbane, Qld, Australia
| | - KeeMing Chia
- The University of Queensland Diamantina Institute, The University of Queensland, Brisbane, Qld, Australia
- The Kinghorn Cancer Centre, Garvan Institute of Medical Research, Sydney, NSW, Australia
| | - Gavriel Grossman
- The University of Queensland Diamantina Institute, The University of Queensland, Brisbane, Qld, Australia
| | - Jonathan J Ellis
- The University of Queensland Diamantina Institute, The University of Queensland, Brisbane, Qld, Australia
| | - Mareike Dahmer-Heath
- The University of Queensland Diamantina Institute, The University of Queensland, Brisbane, Qld, Australia
| | - Dubravka Škalamera
- The University of Queensland Diamantina Institute, The University of Queensland, Brisbane, Qld, Australia
| | - Sandra Pavey
- The University of Queensland Diamantina Institute, The University of Queensland, Brisbane, Qld, Australia
| | - Bryan Burmeister
- The University of Queensland Diamantina Institute, The University of Queensland, Brisbane, Qld, Australia
- Division of Cancer Services, Princess Alexandra Hospital, Brisbane, Qld, Australia
| | - Brian Gabrielli
- The University of Queensland Diamantina Institute, The University of Queensland, Brisbane, Qld, Australia
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37
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Lochmatter C, Fischer R, Charles PD, Yu Z, Powrie F, Kessler BM. Integrative Phosphoproteomics Links IL-23R Signaling with Metabolic Adaptation in Lymphocytes. Sci Rep 2016; 6:24491. [PMID: 27080861 PMCID: PMC4832251 DOI: 10.1038/srep24491] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2015] [Accepted: 03/30/2016] [Indexed: 12/15/2022] Open
Abstract
Interleukin (IL)-23 mediated signal transduction represents a major molecular mechanism underlying the pathology of inflammatory bowel disease, Crohn's disease and ulcerative colitis. In addition, emerging evidence supports the role of IL-23-driven Th17 cells in inflammation. Components of the IL-23 signaling pathway, such as IL-23R, JAK2 and STAT3, have been characterized, but elements unique to this network as compared to other interleukins have not been readily explored. In this study, we have undertaken an integrative phosphoproteomics approach to better characterise downstream signaling events. To this end, we performed and compared phosphopeptide and phosphoprotein enrichment methodologies after activation of T lymphocytes by IL-23. We demonstrate the complementary nature of the two phosphoenrichment approaches by maximizing the capture of phosphorylation events. A total of 8202 unique phosphopeptides, and 4317 unique proteins were identified, amongst which STAT3, PKM2, CDK6 and LASP-1 showed induction of specific phosphorylation not readily observed after IL-2 stimulation. Interestingly, quantitative analysis revealed predominant phosphorylation of pre-existing STAT3 nuclear subsets in addition to translocation of phosphorylated STAT3 within 30 min after IL-23 stimulation. After IL-23R activation, a small subset of PKM2 also translocates to the nucleus and may contribute to STAT3 phosphorylation, suggesting multiple cellular responses including metabolic adaptation.
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Affiliation(s)
- Corinne Lochmatter
- Kennedy Institute, Nuffield Department of Orthopedics Research Medical Science, Roosevelt Drive, Oxford OX3 7LF, UK
- Ludwig Institute for Cancer Research Ltd, Nuffield Department of Medicine, University of Oxford, Old Road Campus Research Building, Oxford OX3 7DQ, UK
| | - Roman Fischer
- Kennedy Institute, Nuffield Department of Orthopedics Research Medical Science, Roosevelt Drive, Oxford OX3 7LF, UK
- Target Discovery Institute, Nuffield Department of Medicine, University of Oxford, Roosevelt Drive, Oxford OX3 7FZ, UK
| | - Philip D. Charles
- Target Discovery Institute, Nuffield Department of Medicine, University of Oxford, Roosevelt Drive, Oxford OX3 7FZ, UK
| | - Zhanru Yu
- Target Discovery Institute, Nuffield Department of Medicine, University of Oxford, Roosevelt Drive, Oxford OX3 7FZ, UK
| | - Fiona Powrie
- Kennedy Institute, Nuffield Department of Orthopedics Research Medical Science, Roosevelt Drive, Oxford OX3 7LF, UK
| | - Benedikt M. Kessler
- Target Discovery Institute, Nuffield Department of Medicine, University of Oxford, Roosevelt Drive, Oxford OX3 7FZ, UK
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Bonilla X, Parmentier L, King B, Bezrukov F, Kaya G, Zoete V, Seplyarskiy VB, Sharpe HJ, McKee T, Letourneau A, Ribaux PG, Popadin K, Basset-Seguin N, Ben Chaabene R, Santoni FA, Andrianova MA, Guipponi M, Garieri M, Verdan C, Grosdemange K, Sumara O, Eilers M, Aifantis I, Michielin O, de Sauvage FJ, Antonarakis SE, Nikolaev SI. Genomic analysis identifies new drivers and progression pathways in skin basal cell carcinoma. Nat Genet 2016; 48:398-406. [PMID: 26950094 DOI: 10.1038/ng.3525] [Citation(s) in RCA: 321] [Impact Index Per Article: 40.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2015] [Accepted: 02/11/2016] [Indexed: 12/13/2022]
Abstract
Basal cell carcinoma (BCC) of the skin is the most common malignant neoplasm in humans. BCC is primarily driven by the Sonic Hedgehog (Hh) pathway. However, its phenotypic variation remains unexplained. Our genetic profiling of 293 BCCs found the highest mutation rate in cancer (65 mutations/Mb). Eighty-five percent of the BCCs harbored mutations in Hh pathway genes (PTCH1, 73% or SMO, 20% (P = 6.6 × 10(-8)) and SUFU, 8%) and in TP53 (61%). However, 85% of the BCCs also harbored additional driver mutations in other cancer-related genes. We observed recurrent mutations in MYCN (30%), PPP6C (15%), STK19 (10%), LATS1 (8%), ERBB2 (4%), PIK3CA (2%), and NRAS, KRAS or HRAS (2%), and loss-of-function and deleterious missense mutations were present in PTPN14 (23%), RB1 (8%) and FBXW7 (5%). Consistent with the mutational profiles, N-Myc and Hippo-YAP pathway target genes were upregulated. Functional analysis of the mutations in MYCN, PTPN14 and LATS1 suggested their potential relevance in BCC tumorigenesis.
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Affiliation(s)
- Ximena Bonilla
- Department of Genetic Medicine and Development, University of Geneva Medical School, Geneva, Switzerland
| | | | - Bryan King
- Department of Pathology, New York University School of Medicine, New York, New York, USA
| | - Fedor Bezrukov
- Department of Physics, University of Connecticut, Storrs, Connecticut, USA
- RIKEN BNL Research Center, Brookhaven National Laboratory, Upton, New York, USA
| | - Gürkan Kaya
- Department of Dermatology, University Hospitals of Geneva, Geneva, Switzerland
| | - Vincent Zoete
- Swiss Institute of Bioinformatics, Lausanne, Switzerland
| | - Vladimir B Seplyarskiy
- Institute of Information Transmission Problems, Russian Academy of Sciences, Moscow, Russia
- Pirogov Russian National Research Medical University, Moscow, Russia
- Lomonosov Moscow State University, Moscow, Russia
| | - Hayley J Sharpe
- Department of Molecular Oncology, Genentech, Inc., South San Francisco, California, USA
| | - Thomas McKee
- Service of Clinical Pathology, University Hospitals of Geneva, Geneva, Switzerland
| | - Audrey Letourneau
- Department of Genetic Medicine and Development, University of Geneva Medical School, Geneva, Switzerland
| | - Pascale G Ribaux
- Department of Genetic Medicine and Development, University of Geneva Medical School, Geneva, Switzerland
| | - Konstantin Popadin
- Department of Genetic Medicine and Development, University of Geneva Medical School, Geneva, Switzerland
| | - Nicole Basset-Seguin
- Department of Dermatology, Saint Louis Hospital, Paris 7 University, Paris, France
| | - Rouaa Ben Chaabene
- Department of Genetic Medicine and Development, University of Geneva Medical School, Geneva, Switzerland
| | - Federico A Santoni
- Department of Genetic Medicine and Development, University of Geneva Medical School, Geneva, Switzerland
- Service of Genetic Medicine, University Hospitals of Geneva, Geneva, Switzerland
| | - Maria A Andrianova
- Institute of Information Transmission Problems, Russian Academy of Sciences, Moscow, Russia
- Pirogov Russian National Research Medical University, Moscow, Russia
- Lomonosov Moscow State University, Moscow, Russia
| | - Michel Guipponi
- Service of Genetic Medicine, University Hospitals of Geneva, Geneva, Switzerland
| | - Marco Garieri
- Department of Genetic Medicine and Development, University of Geneva Medical School, Geneva, Switzerland
| | - Carole Verdan
- Service of Clinical Pathology, University Hospitals of Geneva, Geneva, Switzerland
| | - Kerstin Grosdemange
- Department of Dermatology, University Hospitals of Geneva, Geneva, Switzerland
| | - Olga Sumara
- Department of Biochemistry and Molecular Biology, University of Würzburg, Würzburg, Germany
| | - Martin Eilers
- Department of Biochemistry and Molecular Biology, University of Würzburg, Würzburg, Germany
- Comprehensive Cancer Center Mainfranken, University of Würzburg, Würzburg, Germany
| | - Iannis Aifantis
- Department of Pathology, New York University School of Medicine, New York, New York, USA
| | - Olivier Michielin
- Swiss Institute of Bioinformatics, Lausanne, Switzerland
- Department of Oncology, University of Lausanne and Centre Hospitalier Universitaire Vaudois (CHUV), Lausanne, Switzerland
| | - Frederic J de Sauvage
- Department of Molecular Oncology, Genentech, Inc., South San Francisco, California, USA
| | - Stylianos E Antonarakis
- Department of Genetic Medicine and Development, University of Geneva Medical School, Geneva, Switzerland
- Service of Genetic Medicine, University Hospitals of Geneva, Geneva, Switzerland
- Institute of Genetics and Genomics of Geneva (iGE3), Geneva, Switzerland
| | - Sergey I Nikolaev
- Department of Genetic Medicine and Development, University of Geneva Medical School, Geneva, Switzerland
- Service of Genetic Medicine, University Hospitals of Geneva, Geneva, Switzerland
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CHK2-BRCA1 tumor-suppressor axis restrains oncogenic Aurora-A kinase to ensure proper mitotic microtubule assembly. Proc Natl Acad Sci U S A 2016; 113:1817-22. [PMID: 26831064 DOI: 10.1073/pnas.1525129113] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
BRCA1 (breast cancer type 1 susceptibility protein) is a multifunctional tumor suppressor involved in DNA damage response, DNA repair, chromatin regulation, and mitotic chromosome segregation. Although the nuclear functions of BRCA1 have been investigated in detail, its role during mitosis is little understood. It is clear, however, that loss of BRCA1 in human cancer cells leads to chromosomal instability (CIN), which is defined as a perpetual gain or loss of whole chromosomes during mitosis. Moreover, our recent work has revealed that the mitotic function of BRCA1 depends on its phosphorylation by the tumor-suppressor kinase Chk2 (checkpoint kinase 2) and that this regulation is required to ensure normal microtubule plus end assembly rates within mitotic spindles. Intriguingly, loss of the positive regulation of BRCA1 leads to increased oncogenic Aurora-A activity, which acts as a mediator for abnormal mitotic microtubule assembly resulting in chromosome missegregation and CIN. However, how the CHK2-BRCA1 tumor suppressor axis restrains oncogenic Aurora-A during mitosis to ensure karyotype stability remained an open question. Here we uncover a dual molecular mechanism by which the CHK2-BRCA1 axis restrains oncogenic Aurora-A activity during mitosis and identify BRCA1 itself as a target for Aurora-A relevant for CIN. In fact, Chk2-mediated phosphorylation of BRCA1 is required to recruit the PP6C-SAPS3 phosphatase, which acts as a T-loop phosphatase inhibiting Aurora-A bound to BRCA1. Consequently, loss of CHK2 or PP6C-SAPS3 promotes Aurora-A activity associated with BRCA1 in mitosis. Aurora-A, in turn, then phosphorylates BRCA1 itself, thereby inhibiting the mitotic function of BRCA1 and promoting mitotic microtubule assembly, chromosome missegregation, and CIN.
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40
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Ogoh H, Tanuma N, Matsui Y, Hayakawa N, Inagaki A, Sumiyoshi M, Momoi Y, Kishimoto A, Suzuki M, Sasaki N, Ohuchi T, Nomura M, Teruya Y, Yasuda K, Watanabe T, Shima H. The protein phosphatase 6 catalytic subunit (Ppp6c) is indispensable for proper post-implantation embryogenesis. Mech Dev 2016; 139:1-9. [DOI: 10.1016/j.mod.2016.02.001] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2015] [Revised: 01/28/2016] [Accepted: 02/05/2016] [Indexed: 10/22/2022]
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41
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Rusin SF, Schlosser KA, Adamo ME, Kettenbach AN. Quantitative phosphoproteomics reveals new roles for the protein phosphatase PP6 in mitotic cells. Sci Signal 2015; 8:rs12. [PMID: 26462736 DOI: 10.1126/scisignal.aab3138] [Citation(s) in RCA: 48] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Protein phosphorylation is an important regulatory mechanism controlling mitotic progression. Protein phosphatase 6 (PP6) is an essential enzyme with conserved roles in chromosome segregation and spindle assembly from yeast to humans. We applied a baculovirus-mediated gene silencing approach to deplete HeLa cells of the catalytic subunit of PP6 (PP6c) and analyzed changes in the phosphoproteome and proteome in mitotic cells by quantitative mass spectrometry-based proteomics. We identified 408 phosphopeptides on 272 proteins that increased and 298 phosphopeptides on 220 proteins that decreased in phosphorylation upon PP6c depletion in mitotic cells. Motif analysis of the phosphorylated sites combined with bioinformatics pathway analysis revealed previously unknown PP6c-dependent regulatory pathways. Biochemical assays demonstrated that PP6c opposed casein kinase 2-dependent phosphorylation of the condensin I subunit NCAP-G, and cellular analysis showed that depletion of PP6c resulted in defects in chromosome condensation and segregation in anaphase, consistent with dysregulation of condensin I function in the absence of PP6 activity.
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Affiliation(s)
- Scott F Rusin
- Department of Biochemistry, Geisel School of Medicine at Dartmouth, Hanover, NH 03755, USA
| | - Kate A Schlosser
- Norris Cotton Cancer Center, Geisel School of Medicine at Dartmouth, Lebanon, NH 03756, USA
| | - Mark E Adamo
- Norris Cotton Cancer Center, Geisel School of Medicine at Dartmouth, Lebanon, NH 03756, USA
| | - Arminja N Kettenbach
- Department of Biochemistry, Geisel School of Medicine at Dartmouth, Hanover, NH 03755, USA. Norris Cotton Cancer Center, Geisel School of Medicine at Dartmouth, Lebanon, NH 03756, USA.
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42
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van der Weyden L, Patton EE, Wood GA, Foote AK, Brenn T, Arends MJ, Adams DJ. Cross-species models of human melanoma. J Pathol 2015; 238:152-65. [PMID: 26354726 PMCID: PMC4832391 DOI: 10.1002/path.4632] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2015] [Revised: 08/18/2015] [Accepted: 09/06/2015] [Indexed: 01/29/2023]
Abstract
Although transformation of melanocytes to melanoma is rare, the rapid growth, systemic spread, as well as the chemoresistance of melanoma present significant challenges for patient care. Here we review animal models of melanoma, including murine, canine, equine, and zebrafish models, and detail the immense contribution these models have made to our knowledge of human melanoma development, and to melanocyte biology. We also highlight the opportunities for cross-species comparative genomic studies of melanoma to identify the key molecular events that drive this complex disease.
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Affiliation(s)
- Louise van der Weyden
- Experimental Cancer Genetics, The Wellcome Trust Sanger Institute, Hinxton, Cambridgeshire, CB10 1SA, UK
| | - E Elizabeth Patton
- MRC Human Genetics Unit, The MRC Institute of Genetics and Molecular Medicine, The University of Edinburgh, Western General Hospital, Crewe Road, Edinburgh, EH4 2XU, UK
| | - Geoffrey A Wood
- Department of Pathobiology, Ontario Veterinary College, University of Guelph, 50 Stone Road E, Guelph, Ontario, N1G 2W1, Canada
| | - Alastair K Foote
- Rossdales Equine Hospital, Cotton End Road, Exning, Newmarket, Suffolk, CB8 7NN, UK
| | - Thomas Brenn
- Pathology Department, Western General Hospital, Crewe Road, Edinburgh, EH4 2XU, UK
| | - Mark J Arends
- Centre for Comparative Pathology, University of Edinburgh, Western General Hospital, Crewe Road South, Edinburgh, EH4 2XR, UK
| | - David J Adams
- Experimental Cancer Genetics, The Wellcome Trust Sanger Institute, Hinxton, Cambridgeshire, CB10 1SA, UK
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43
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Hu MW, Wang ZB, Teng Y, Jiang ZZ, Ma XS, Hou N, Cheng X, Schatten H, Xu X, Yang X, Sun QY. Loss of protein phosphatase 6 in oocytes causes failure of meiosis II exit and impaired female fertility. J Cell Sci 2015; 128:3769-80. [PMID: 26349807 DOI: 10.1242/jcs.173179] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2015] [Accepted: 09/03/2015] [Indexed: 01/29/2023] Open
Abstract
Dynamic protein phosphorylation and dephosphorylation, mediated by a conserved cohort of protein kinases and phosphatases, regulate cell cycle progression. Among the well-known PP2A-like protein phosphatases, protein phosphatase 6 (PP6) has been analyzed in mammalian mitosis, and Aurora A has recently been identified as its key substrate. However, the functions of PP6 in meiosis are still entirely unknown. To identify the physiological role of PP6 in female gametogenesis, Ppp6c(F/F) mice were first generated and crossed with Zp3-Cre mice to selectively disrupt Ppp6c expression in oocytes. Here, we report for the first time that PP6c is dispensable for oocyte meiotic maturation but essential for exit from meiosis II (MII) after fertilization. Depletion of PP6c caused an abnormal MII spindle and disrupted MII cytokinesis, resulting in zygotes with high risk of aneuploidy and defective early embryonic development, and thus severe subfertility. We also reveal that PP6 inactivation interferes with MII spindle formation and MII exit owing to increased Aurora A activity, and that Aurora A inhibition with MLN8237 can rescue the PP6c depletion phenotype. In conclusion, our findings uncover a hitherto unknown role for PP6 as an indispensable regulator of oocyte meiosis and female fertility.
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Affiliation(s)
- Meng-Wen Hu
- State Key Laboratory of Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, China University of Chinese Academy of Sciences, Beijing 100101, China
| | - Zhen-Bo Wang
- State Key Laboratory of Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, China
| | - Yan Teng
- State Key Laboratory of Proteomics, Genetic Laboratory of Development and Disease, Institute of Biotechnology, 20 Dongdajie, Beijing 100071, China
| | - Zong-Zhe Jiang
- State Key Laboratory of Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, China University of Chinese Academy of Sciences, Beijing 100101, China
| | - Xue-Shan Ma
- State Key Laboratory of Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, China
| | - Ning Hou
- State Key Laboratory of Proteomics, Genetic Laboratory of Development and Disease, Institute of Biotechnology, 20 Dongdajie, Beijing 100071, China
| | - Xuan Cheng
- State Key Laboratory of Proteomics, Genetic Laboratory of Development and Disease, Institute of Biotechnology, 20 Dongdajie, Beijing 100071, China
| | - Heide Schatten
- Department of Veterinary Pathobiology, University of Missouri, Columbia, MO 65211, USA
| | - Xingzhi Xu
- Beijing Key Laboratory of DNA Damage Response and College of Life Sciences, Capital Normal University, Beijing 100048, China
| | - Xiao Yang
- State Key Laboratory of Proteomics, Genetic Laboratory of Development and Disease, Institute of Biotechnology, 20 Dongdajie, Beijing 100071, China
| | - Qing-Yuan Sun
- State Key Laboratory of Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, China
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44
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Krauthammer M, Kong Y, Bacchiocchi A, Evans P, Pornputtapong N, Wu C, McCusker JP, Ma S, Cheng E, Straub R, Serin M, Bosenberg M, Ariyan S, Narayan D, Sznol M, Kluger HM, Mane S, Schlessinger J, Lifton RP, Halaban R. Exome sequencing identifies recurrent mutations in NF1 and RASopathy genes in sun-exposed melanomas. Nat Genet 2015. [PMID: 26214590 DOI: 10.1038/ng.3361] [Citation(s) in RCA: 279] [Impact Index Per Article: 31.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
We report on whole-exome sequencing (WES) of 213 melanomas. Our analysis established NF1, encoding a negative regulator of RAS, as the third most frequently mutated gene in melanoma, after BRAF and NRAS. Inactivating NF1 mutations were present in 46% of melanomas expressing wild-type BRAF and RAS, occurred in older patients and showed a distinct pattern of co-mutation with other RASopathy genes, particularly RASA2. Functional studies showed that NF1 suppression led to increased RAS activation in most, but not all, melanoma cases. In addition, loss of NF1 did not predict sensitivity to MEK or ERK inhibitors. The rebound pathway, as seen by the induction of phosphorylated MEK, occurred in cells both sensitive and resistant to the studied drugs. We conclude that NF1 is a key tumor suppressor lost in melanomas, and that concurrent RASopathy gene mutations may enhance its role in melanomagenesis.
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Affiliation(s)
- Michael Krauthammer
- Program in Computational Biology and Bioinformatics, Yale University School of Medicine, New Haven, Connecticut, USA.,Department of Pathology, Yale University School of Medicine, New Haven, Connecticut, USA
| | - Yong Kong
- Molecular Biophysics and Biochemistry, Yale University School of Medicine, New Haven, Connecticut, USA
| | - Antonella Bacchiocchi
- Department of Dermatology, Yale University School of Medicine, New Haven, Connecticut, USA
| | - Perry Evans
- Program in Computational Biology and Bioinformatics, Yale University School of Medicine, New Haven, Connecticut, USA
| | - Natapol Pornputtapong
- Department of Pathology, Yale University School of Medicine, New Haven, Connecticut, USA
| | - Cen Wu
- School of Public Health, Yale University School of Medicine, New Haven, Connecticut, USA
| | - James P McCusker
- Department of Pathology, Yale University School of Medicine, New Haven, Connecticut, USA
| | - Shuangge Ma
- School of Public Health, Yale University School of Medicine, New Haven, Connecticut, USA
| | - Elaine Cheng
- Department of Dermatology, Yale University School of Medicine, New Haven, Connecticut, USA
| | - Robert Straub
- Department of Dermatology, Yale University School of Medicine, New Haven, Connecticut, USA
| | - Merdan Serin
- Department of Dermatology, Yale University School of Medicine, New Haven, Connecticut, USA
| | - Marcus Bosenberg
- Department of Pathology, Yale University School of Medicine, New Haven, Connecticut, USA.,Department of Dermatology, Yale University School of Medicine, New Haven, Connecticut, USA
| | - Stephan Ariyan
- Department of Surgery, Yale University School of Medicine, New Haven, Connecticut, USA
| | - Deepak Narayan
- Department of Surgery, Yale University School of Medicine, New Haven, Connecticut, USA
| | - Mario Sznol
- Comprehensive Cancer Center Section of Medical Oncology, Yale University School of Medicine, New Haven, Connecticut, USA
| | - Harriet M Kluger
- Comprehensive Cancer Center Section of Medical Oncology, Yale University School of Medicine, New Haven, Connecticut, USA
| | - Shrikant Mane
- Yale Center for Genome Analysis, Yale University School of Medicine, New Haven, Connecticut, USA.,Department of Genetics, Yale University School of Medicine, New Haven, Connecticut, USA
| | - Joseph Schlessinger
- Department of Pharmacology, Yale University School of Medicine, New Haven, Connecticut, USA
| | - Richard P Lifton
- Department of Genetics, Yale University School of Medicine, New Haven, Connecticut, USA.,Howard Hughes Medical Institute, Yale University School of Medicine, New Haven, Connecticut, USA
| | - Ruth Halaban
- Department of Dermatology, Yale University School of Medicine, New Haven, Connecticut, USA
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45
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Loss of protein phosphatase 6 in mouse keratinocytes increases susceptibility to ultraviolet-B-induced carcinogenesis. Cancer Lett 2015; 365:223-8. [PMID: 26054846 DOI: 10.1016/j.canlet.2015.05.022] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2015] [Revised: 05/19/2015] [Accepted: 05/29/2015] [Indexed: 12/11/2022]
Abstract
We previously reported that deficiency in the gene encoding the catalytic subunit of protein phosphatase 6 (Ppp6c) predisposes mouse skin tissue to papilloma formation initiated by DMBA. Here, we demonstrate that Ppp6c loss acts as a tumor promoter in UVB-induced squamous cell carcinogenesis. Following UVB irradiation, mice with Ppp6c-deficient keratinocytes showed a higher incidence of skin squamous cell carcinoma than did control mice. Time course experiments showed that following UVB irradiation, Ppp6c-deficient keratinocytes upregulated expression of p53, PUMA, BAX, and cleaved caspase-3 proteins. UVB-induced tumors in Ppp6c-deficient keratinocytes exhibited a high frequency of both p53- and γH2AX-positive cells, suggestive of DNA damage. Epidemiological and molecular data strongly suggest that UVB from sunlight induces p53 gene mutations in keratinocytes and is the primary causative agent of human skin cancers. Our analysis suggests that PP6 deficiency underlies molecular events that drive outgrowth of initiated keratinocytes harboring UVB-induced mutated p53. Understanding PP6 function in preventing UV-induced tumorigenesis could suggest strategies to prevent and treat this condition.
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46
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Boylan JM, Salomon AR, Tantravahi U, Gruppuso PA. Adaptation of HepG2 cells to a steady-state reduction in the content of protein phosphatase 6 (PP6) catalytic subunit. Exp Cell Res 2015; 335:224-37. [PMID: 25999147 DOI: 10.1016/j.yexcr.2015.05.008] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2014] [Revised: 05/06/2015] [Accepted: 05/08/2015] [Indexed: 11/27/2022]
Abstract
Protein phosphatase 6 (PP6) is a ubiquitous Ser/Thr phosphatase involved in an array of cellular processes. To assess the potential of PP6 as a therapeutic target in liver disorders, we attenuated expression of the PP6 catalytic subunit in HepG2 cells using lentiviral-transduced shRNA. Two PP6 knock-down (PP6KD) cell lines (90% reduction of PP6-C protein content) were studied in depth. Both proliferated at a rate similar to control cells. However, flow cytometry indicated G2/M cell cycle arrest that was accounted for by a shift of the cells from a diploid to tetraploid state. PP6KD cells did not show an increase in apoptosis, nor did they exhibit reduced viability in the presence of bleomycin or taxol. Gene expression analysis by microarray showed attenuated anti-inflammatory signaling. Genes associated with DNA replication were downregulated. Mass spectrometry-based phosphoproteomic analysis yielded 80 phosphopeptides representing 56 proteins that were significantly affected by a stable reduction in PP6-C. Proteins involved in DNA replication, DNA damage repair and pre-mRNA splicing were overrepresented among these. PP6KD cells showed intact mTOR signaling. Our studies demonstrated involvement of PP6 in a diverse set of biological pathways and an adaptive response that may limit the effectiveness of targeting PP6 in liver disorders.
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Affiliation(s)
- Joan M Boylan
- Department of Pediatrics, Brown University and Rhode Island Hospital, Providence, RI, USA
| | - Arthur R Salomon
- Department of Molecular Biology, Cell Biology and Biochemistry, Brown University, Providence, RI, USA; Department of Chemistry, Brown University, Providence, RI, USA
| | - Umadevi Tantravahi
- Division of Genetics, Department of Pathology, Brown University and Women and Infants Hospital, Providence, RI, USA
| | - Philip A Gruppuso
- Department of Pediatrics, Brown University and Rhode Island Hospital, Providence, RI, USA; Department of Molecular Biology, Cell Biology and Biochemistry, Brown University, Providence, RI, USA.
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47
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Wengrod J, Wang D, Weiss S, Zhong H, Osman I, Gardner LB. Phosphorylation of eIF2α triggered by mTORC1 inhibition and PP6C activation is required for autophagy and is aberrant in PP6C-mutated melanoma. Sci Signal 2015; 8:ra27. [PMID: 25759478 DOI: 10.1126/scisignal.aaa0899] [Citation(s) in RCA: 68] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Amino acid deprivation promotes the inhibition of the kinase complex mTORC1 (mammalian target of rapamycin complex 1) and activation of the kinase GCN2 (general control nonrepressed 2). Signaling pathways downstream of both kinases have been thought to independently induce autophagy. We showed that these two amino acid-sensing systems are linked. We showed that pharmacological inhibition of mTORC1 led to activation of GCN2 and phosphorylation of the eukaryotic initiation factor 2α (eIF2α) in a mechanism dependent on the catalytic subunit of protein phosphatase 6 (PP6C). Autophagy induced by pharmacological inhibition of mTORC1 required PP6C, GCN2, and eIF2α phosphorylation. Although some of the PP6C mutants found in melanoma did not form a strong complex with PP6 regulatory subunits and were rapidly degraded, these mutants paradoxically stabilized PP6C encoded by the wild-type allele and increased eIF2α phosphorylation. Furthermore, these PP6C mutations were associated with increased autophagy in vitro and in human melanoma samples. Thus, these data showed that GCN2 activation and phosphorylation of eIF2α in response to mTORC1 inhibition are necessary for autophagy. Additionally, we described a role for PP6C in this process and provided a mechanism for PP6C mutations associated with melanoma.
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Affiliation(s)
- Jordan Wengrod
- Department of Medicine, New York University School of Medicine, New York, NY 10016, USA
| | - Ding Wang
- Department of Medicine, New York University School of Medicine, New York, NY 10016, USA
| | - Sarah Weiss
- Department of Medicine, New York University School of Medicine, New York, NY 10016, USA
| | - Hua Zhong
- Department of Population Health, New York University School of Medicine, New York, NY 10016, USA
| | - Iman Osman
- Department of Dermatology, New York University School of Medicine, New York, NY 10016, USA. NYU Perlmutter Cancer Center, New York University School of Medicine, New York, NY 10016, USA
| | - Lawrence B Gardner
- Department of Medicine, New York University School of Medicine, New York, NY 10016, USA. NYU Perlmutter Cancer Center, New York University School of Medicine, New York, NY 10016, USA. Department of Biochemistry and Molecular Pharmacology, New York University School of Medicine, New York, NY 10016, USA.
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48
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Ye J, Shi H, Shen Y, Peng C, Liu Y, Li C, Deng K, Geng J, Xu T, Zhuang Y, Zheng B, Tao W. PP6 controls T cell development and homeostasis by negatively regulating distal TCR signaling. THE JOURNAL OF IMMUNOLOGY 2015; 194:1654-64. [PMID: 25609840 DOI: 10.4049/jimmunol.1401692] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
T cell development and homeostasis are both regulated by TCR signals. Protein phosphorylation and dephosphorylation, which are catalyzed by protein kinases and phosphatases, respectively, serve as important switches controlling multiple downstream pathways triggered by TCR recognition of Ags. It has been well documented that protein tyrosine phosphatases are involved in negative regulation of proximal TCR signaling. However, how TCR signals are terminated or attenuated in the distal TCR signaling pathways is largely unknown. We investigated the function of Ser/Thr protein phosphatase (PP) 6 in TCR signaling. T cell lineage-specific ablation of PP6 in mice resulted in enhanced thymic positive and negative selection, and preferential expansion of fetal-derived, IL-17-producing Vγ6Vδ1(+) T cells. Both PP6-deficient peripheral CD4(+) helper and CD8(+) cytolytic cells could not maintain a naive state and became fast-proliferating and short-lived effector cells. PP6 deficiency led to profound hyperactivation of multiple distal TCR signaling molecules, including MAPKs, AKT, and NF-κB. Our studies demonstrate that PP6 acts as a critical negative regulator, not only controlling both αβ and γδ lineage development, but also maintaining naive T cell homeostasis by preventing their premature activation before Ag stimulation.
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Affiliation(s)
- Jian Ye
- State Key Laboratory of Genetic Engineering and Institute of Developmental Biology and Molecular Medicine, National Center for International Research of Development and Disease, School of Life Sciences, Fudan University, Shanghai 200433, China
| | - Hao Shi
- State Key Laboratory of Genetic Engineering and Institute of Developmental Biology and Molecular Medicine, National Center for International Research of Development and Disease, School of Life Sciences, Fudan University, Shanghai 200433, China
| | - Ye Shen
- State Key Laboratory of Genetic Engineering and Institute of Developmental Biology and Molecular Medicine, National Center for International Research of Development and Disease, School of Life Sciences, Fudan University, Shanghai 200433, China
| | - Chao Peng
- State Key Laboratory of Genetic Engineering and Institute of Developmental Biology and Molecular Medicine, National Center for International Research of Development and Disease, School of Life Sciences, Fudan University, Shanghai 200433, China
| | - Yan Liu
- State Key Laboratory of Genetic Engineering and Institute of Developmental Biology and Molecular Medicine, National Center for International Research of Development and Disease, School of Life Sciences, Fudan University, Shanghai 200433, China
| | - Chenyu Li
- State Key Laboratory of Genetic Engineering and Institute of Developmental Biology and Molecular Medicine, National Center for International Research of Development and Disease, School of Life Sciences, Fudan University, Shanghai 200433, China
| | - Kejing Deng
- State Key Laboratory of Genetic Engineering and Institute of Developmental Biology and Molecular Medicine, National Center for International Research of Development and Disease, School of Life Sciences, Fudan University, Shanghai 200433, China
| | - Jianguo Geng
- Department of Biologic and Materials Sciences, University of Michigan School of Dentistry, Ann Arbor, MI 48109
| | - Tian Xu
- State Key Laboratory of Genetic Engineering and Institute of Developmental Biology and Molecular Medicine, National Center for International Research of Development and Disease, School of Life Sciences, Fudan University, Shanghai 200433, China; Department of Genetics, Howard Hughes Medical Institute, Yale University School of Medicine, New Haven, CT 06536
| | - Yuan Zhuang
- State Key Laboratory of Genetic Engineering and Institute of Developmental Biology and Molecular Medicine, National Center for International Research of Development and Disease, School of Life Sciences, Fudan University, Shanghai 200433, China; Department of Immunology, Duke University Medical Center, Durham, NC 27701; and
| | - Biao Zheng
- School of Life Sciences, East China Normal University, Shanghai 200241, China
| | - Wufan Tao
- State Key Laboratory of Genetic Engineering and Institute of Developmental Biology and Molecular Medicine, National Center for International Research of Development and Disease, School of Life Sciences, Fudan University, Shanghai 200433, China;
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49
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Lillo C, Kataya ARA, Heidari B, Creighton MT, Nemie-Feyissa D, Ginbot Z, Jonassen EM. Protein phosphatases PP2A, PP4 and PP6: mediators and regulators in development and responses to environmental cues. PLANT, CELL & ENVIRONMENT 2014; 37:2631-48. [PMID: 24810976 DOI: 10.1111/pce.12364] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/03/2014] [Revised: 04/25/2014] [Accepted: 04/28/2014] [Indexed: 05/23/2023]
Abstract
The three closely related groups of serine/threonine protein phosphatases PP2A, PP4 and PP6 are conserved throughout eukaryotes. The catalytic subunits are present in trimeric and dimeric complexes with scaffolding and regulatory subunits that control activity and confer substrate specificity to the protein phosphatases. In Arabidopsis, three scaffolding (A subunits) and 17 regulatory (B subunits) proteins form complexes with five PP2A catalytic subunits giving up to 255 possible combinations. Three SAP-domain proteins act as regulatory subunits of PP6. Based on sequence similarities with proteins in yeast and mammals, two putative PP4 regulatory subunits are recognized in Arabidopsis. Recent breakthroughs have been made concerning the functions of some of the PP2A and PP6 regulatory subunits, for example the FASS/TON2 in regulation of the cellular skeleton, B' subunits in brassinosteroid signalling and SAL proteins in regulation of auxin transport. Reverse genetics is starting to reveal also many more physiological functions of other subunits. A system with key regulatory proteins (TAP46, TIP41, PTPA, LCMT1, PME-1) is present in all eukaryotes to stabilize, activate and inactivate the catalytic subunits. In this review, we present the status of knowledge concerning physiological functions of PP2A, PP4 and PP6 in Arabidopsis, and relate these to yeast and mammals.
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Affiliation(s)
- Cathrine Lillo
- Centre for Organelle Research, Faculty of Science and Technology, University of Stavanger, Stavanger, N-4036, Norway
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50
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Ascierto PA, Grimaldi AM, Anderson AC, Bifulco C, Cochran A, Garbe C, Eggermont AM, Faries M, Ferrone S, Gershenwald JE, Gajewski TF, Halaban R, Hodi FS, Kefford R, Kirkwood JM, Larkin J, Leachman S, Maio M, Marais R, Masucci G, Melero I, Palmieri G, Puzanov I, Ribas A, Saenger Y, Schilling B, Seliger B, Stroncek D, Sullivan R, Testori A, Wang E, Ciliberto G, Mozzillo N, Marincola FM, Thurin M. Future perspectives in melanoma research: meeting report from the "Melanoma Bridge", Napoli, December 5th-8th 2013. J Transl Med 2014; 12:277. [PMID: 25348889 PMCID: PMC4232645 DOI: 10.1186/s12967-014-0277-z] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2014] [Accepted: 09/23/2014] [Indexed: 12/28/2022] Open
Abstract
The fourth "Melanoma Bridge Meeting" took place in Naples, December 5 to 8th, 2013. The four topics discussed at this meeting were: Diagnosis and New Procedures, Molecular Advances and Combination Therapies, News in Immunotherapy, and Tumor Microenvironment and Biomarkers.
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Affiliation(s)
- Paolo A Ascierto
- />Istituto Nazionale Tumori, Fondazione “G. Pascale”, Napoli, Italy
| | | | | | - Carlo Bifulco
- />Translational Molecular Pathology, Earle A. Chiles Research Institute, Providence Cancer Center, Portland, OR USA
| | - Alistair Cochran
- />Departments of Pathology and Laboratory Medicine and Surgery, David Geffen School of Medicine at University of California Los Angeles (UCLA), John Wayne Cancer Institute, Santa Monica, CA USA
| | - Claus Garbe
- />Center for Dermato Oncology, Department of Dermatology, University of Tübingen, Tübingen, Germany
| | | | - Mark Faries
- />Donald L. Morton Melanoma Research Program, John Wayne Cancer Institute, Santa Monica, CA USA
| | - Soldano Ferrone
- />Department of Surgery, Massachusetts General Hospital, Harvard Medical School, Boston, MA USA
| | - Jeffrey E Gershenwald
- />Department of Surgical Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX USA
| | - Thomas F Gajewski
- />Departments of Medicine and of Pathology, Immunology and Cancer Program, The University of Chicago Medicine, Chicago, IL USA
| | - Ruth Halaban
- />Department of Dermatology, Yale University School of Medicine, New Haven, CT USA
| | - F Stephen Hodi
- />Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, MA USA
| | - Richard Kefford
- />Westmead Institute for Cancer Research, Westmead Millennium Institute and Melanoma Institute Australia, University of Sydney, Sydney, NSW Australia
| | - John M Kirkwood
- />Division of Hematology/Oncology, Departments of Medicine, Dermatology, and Translational Science, University of Pittsburgh School of Medicine and Melanoma Program of the Pittsburgh Cancer Institute, Pittsburgh, PA USA
| | - James Larkin
- />Royal Marsden NHS Foundation Trust, London, UK
| | - Sancy Leachman
- />Department of Dermatology, Oregon Health Sciences University, Portland, OR USA
| | - Michele Maio
- />Medical Oncology and Immunotherapy, Department of Oncology, University Hospital of Siena, Istituto Toscano Tumori, Siena, Italy
| | - Richard Marais
- />Molecular Oncology Group, The Paterson Institute for Cancer Research, Wilmslow Road, Manchester, M20 4BX UK
| | - Giuseppe Masucci
- />Department of Oncology-Pathology, The Karolinska Hospital, Stockholm, Sweden
| | - Ignacio Melero
- />Centro de Investigación Médica Aplicada, Clinica Universidad de Navarra, Pamplona, Navarra Spain
| | - Giuseppe Palmieri
- />Unit of Cancer Genetics, Institute of Biomolecular Chemistry, National Research Council, Sassari, Italy
| | - Igor Puzanov
- />Vanderbilt University Medical Center, Nashville, TN USA
| | - Antoni Ribas
- />Tumor Immunology Program, Jonsson Comprehensive Cancer Center (JCCC), David Geffen School of Medicine, University of California Los Angeles (UCLA), Los Angeles, CA USA
| | - Yvonne Saenger
- />Division of Hematology and Oncology, Tisch Cancer Institute, Department of Dermatology, Icahn School of Medicine at Mount Sinai, New York, NY USA
| | - Bastian Schilling
- />Department of Dermatology, University Hospital, West German Cancer Center, University Duisburg-Essen, Essen, Germany
- />German Cancer Consortium (DKTK), Heidelberg, Germany
| | - Barbara Seliger
- />Martin Luther University Halle-Wittenberg, Institute of Medical Immunology, Halle, Germany
| | - David Stroncek
- />Cell Processing Section, Department of Transfusion Medicine, Clinical Center, NIH, Bethesda, MD USA
| | - Ryan Sullivan
- />Center for Melanoma, Massachusetts General Hospital Cancer Center, Harvard Medical School, Boston, MA USA
| | | | - Ena Wang
- />Division Chief of Translational Medicine, Sidra Medical and Research Centre, Doha, Qatar
| | | | - Nicola Mozzillo
- />Istituto Nazionale Tumori, Fondazione “G. Pascale”, Napoli, Italy
| | | | - Magdalena Thurin
- />Cancer Diagnosis Program, National Cancer Institute, NIH, Bethesda, MD USA
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