1
|
Grimm TM, Herbinger M, Krüger L, Müller S, Mayer TU, Hauck CR. Lockdown, a selective small-molecule inhibitor of the integrin phosphatase PPM1F, blocks cancer cell invasion. Cell Chem Biol 2022; 29:930-946.e9. [PMID: 35443151 DOI: 10.1016/j.chembiol.2022.03.011] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2021] [Revised: 03/04/2022] [Accepted: 03/23/2022] [Indexed: 12/18/2022]
Abstract
Phosphatase PPM1F is a regulator of cell adhesion by fine-tuning integrin activity and actin cytoskeleton structures. Elevated expression of this enzyme in human tumors is associated with high invasiveness, enhanced metastasis, and poor prognosis. Thus, PPM1F is a target for pharmacological intervention, yet inhibitors of this enzyme are lacking. Here, we use high-throughput screening to identify Lockdown, a reversible and non-competitive PPM1F inhibitor. Lockdown is selective for PPM1F, because this compound does not inhibit other protein phosphatases in vitro and does not induce additional phenotypes in PPM1F knockout cells. Importantly, Lockdown-treated glioblastoma cells fully re-capitulate the phenotype of PPM1F-deficient cells as assessed by increased phosphorylation of PPM1F substrates and corruption of integrin-dependent cellular processes. Ester modification yields LockdownPro with increased membrane permeability and prodrug-like properties. LockdownPro suppresses tissue invasion by PPM1F-overexpressing human cancer cells, validating PPM1F as a therapeutic target and providing an access point to control tumor cell dissemination.
Collapse
Affiliation(s)
- Tanja M Grimm
- Lehrstuhl Zellbiologie, Department of Biology, University of Konstanz, Maildrop 621, Universitätsstrasse 10, 78467 Konstanz, Germany; Konstanz Research School Chemical Biology, University of Konstanz, Universitätsstrasse 10, 78467 Konstanz, Germany
| | - Marleen Herbinger
- Lehrstuhl Zellbiologie, Department of Biology, University of Konstanz, Maildrop 621, Universitätsstrasse 10, 78467 Konstanz, Germany
| | - Lena Krüger
- Department of Chemistry, University of Konstanz, Universitätsstrasse 10, 78467 Konstanz, Germany; Konstanz Research School Chemical Biology, University of Konstanz, Universitätsstrasse 10, 78467 Konstanz, Germany
| | - Silke Müller
- Lehrstuhl Molekulare Genetik, Department of Biology, University of Konstanz, Universitätsstrasse 10, 78467 Konstanz, Germany; Screening Center, Department of Biology, University of Konstanz, Universitätsstrasse 10, 78467 Konstanz, Germany
| | - Thomas U Mayer
- Lehrstuhl Molekulare Genetik, Department of Biology, University of Konstanz, Universitätsstrasse 10, 78467 Konstanz, Germany; Screening Center, Department of Biology, University of Konstanz, Universitätsstrasse 10, 78467 Konstanz, Germany; Konstanz Research School Chemical Biology, University of Konstanz, Universitätsstrasse 10, 78467 Konstanz, Germany
| | - Christof R Hauck
- Lehrstuhl Zellbiologie, Department of Biology, University of Konstanz, Maildrop 621, Universitätsstrasse 10, 78467 Konstanz, Germany; Konstanz Research School Chemical Biology, University of Konstanz, Universitätsstrasse 10, 78467 Konstanz, Germany.
| |
Collapse
|
2
|
Seumen CHT, Grimm TM, Hauck CR. Protein phosphatases in TLR signaling. Cell Commun Signal 2021; 19:45. [PMID: 33882943 PMCID: PMC8058998 DOI: 10.1186/s12964-021-00722-1] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2020] [Accepted: 02/10/2021] [Indexed: 02/06/2023] Open
Abstract
Toll-like receptors (TLRs) are critical sensors for the detection of potentially harmful microbes. They are instrumental in initiating innate and adaptive immune responses against pathogenic organisms. However, exaggerated activation of TLR receptor signaling can also be responsible for the onset of autoimmune and inflammatory diseases. While positive regulators of TLR signaling, such as protein serine/threonine kinases, have been studied intensively, only little is known about phosphatases, which counterbalance and limit TLR signaling. In this review, we summarize protein phosphorylation events and their roles in the TLR pathway and highlight the involvement of protein phosphatases as negative regulators at specific steps along the TLR-initiated signaling cascade. Then, we focus on individual phosphatase families, specify the function of individual enzymes in TLR signaling in more detail and give perspectives for future research. A better understanding of phosphatase-mediated regulation of TLR signaling could provide novel access points to mitigate excessive immune activation and to modulate innate immune signaling.![]() Video Abstract
Collapse
Affiliation(s)
- Clovis H T Seumen
- Lehrstuhl Zellbiologie, Universität Konstanz, Universitätsstraße 10, Postablage 621, 78457, Konstanz, Germany
| | - Tanja M Grimm
- Lehrstuhl Zellbiologie, Universität Konstanz, Universitätsstraße 10, Postablage 621, 78457, Konstanz, Germany.,Konstanz Research School Chemical Biology, Universität Konstanz, 78457, Konstanz, Germany
| | - Christof R Hauck
- Lehrstuhl Zellbiologie, Universität Konstanz, Universitätsstraße 10, Postablage 621, 78457, Konstanz, Germany. .,Konstanz Research School Chemical Biology, Universität Konstanz, 78457, Konstanz, Germany.
| |
Collapse
|
3
|
Sathe SR, Jain D, Koh CG, Yim EKF. POPX2 phosphatase enhances topographical contact guidance for cell morphology and migration. Biomed Mater 2021; 16:025020. [PMID: 33321483 DOI: 10.1088/1748-605x/abd3b5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Topography mediated contact guidance affects multiple cell behaviors such as establishment of cellular morphology and migration. The direction of cell migration is associated with the establishment of cell polarity, which also affects the primary cilia in migrating cells. POPX2, a partner of PIX2, is involved in pathways essential to primary cilium formation, while over-expression of POPX2 has been reported to cause a loss of cell polarity during migration. This study aims to examine how topographical cues direct morphological changes, and how topography affects the process of cellular migration and primary cilium architecture, in the context of POPX2 over-expression. Thus, the effect of anisotropic topography, 2 μm grating pattern on tissue-culture polystyrene, was used as a contact guidance cue to investigate the migration and cell polarity of POPX2 overexpressing cells, in comparison to control NIH3T3 fibroblast cells. We report that POPX2 overexpressing NIH3T3 cells were more sensitive to surface topographical cues as the cells became more elongated. In addition, these cues also affected focal adhesion alignment of POPX2 overexpressing cells. Cell migration was further studied using wound closure assays, in which the 2 μm gratings were designed to be either perpendicular or parallel to wound-induced cell migration direction, which would be agonistic or antagonistic to cell migration, respectively. We observed that both POPX2 overexpressing cells' migration direction and migration rate were more significantly influenced by gratings direction compared to control NIH3T3 cells. The migration paths of POPX2 overexpressing cells become more direct in the presence of anisotropic topographical cues. Further, cilia and centrosome alignment, which is important in cell migration, was also affected by the direction of gratings during this migration process. Collectively, enhancement of NIH3T3 cell sensitivity towards surface topography through POPX2 overexpression might reflect one of the mechanisms that combine biochemical and mechanical cues for directional cell migration.
Collapse
Affiliation(s)
- Sharvari R Sathe
- Mechanobiology Institute, National University of Singapore, Singapore
| | | | | | | |
Collapse
|
4
|
Grimm TM, Dierdorf NI, Betz K, Paone C, Hauck CR. PPM1F controls integrin activity via a conserved phospho-switch. J Cell Biol 2020; 219:211512. [PMID: 33119040 PMCID: PMC7604772 DOI: 10.1083/jcb.202001057] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2020] [Revised: 07/20/2020] [Accepted: 09/11/2020] [Indexed: 01/04/2023] Open
Abstract
Control of integrin activity is vital during development and tissue homeostasis, while derailment of integrin function contributes to pathophysiological processes. Phosphorylation of a conserved threonine motif (T788/T789) in the integrin β cytoplasmic domain increases integrin activity. Here, we report that T788/T789 functions as a phospho-switch, which determines the association with either talin and kindlin-2, the major integrin activators, or filaminA, an integrin activity suppressor. A genetic screen identifies the phosphatase PPM1F as the critical enzyme, which selectively and directly dephosphorylates the T788/T789 motif. PPM1F-deficient cell lines show constitutive integrin phosphorylation, exaggerated talin binding, increased integrin activity, and enhanced cell adhesion. These gain-of-function phenotypes are reverted by reexpression of active PPM1F, but not a phosphatase-dead mutant. Disruption of the ppm1f gene in mice results in early embryonic death at day E10.5. Together, PPM1F controls the T788/T789 phospho-switch in the integrin β1 cytoplasmic tail and constitutes a novel target to modulate integrin activity.
Collapse
Affiliation(s)
- Tanja M. Grimm
- Lehrstuhl Zellbiologie, Fachbereich Biologie, Universität Konstanz, Konstanz, Germany,Konstanz Research School Chemical Biology, Universität Konstanz, Konstanz, Germany
| | - Nina I. Dierdorf
- Lehrstuhl Zellbiologie, Fachbereich Biologie, Universität Konstanz, Konstanz, Germany,Konstanz Research School Chemical Biology, Universität Konstanz, Konstanz, Germany
| | - Karin Betz
- Konstanz Research School Chemical Biology, Universität Konstanz, Konstanz, Germany,Lehrstuhl Zelluläre Chemie, Fachbereich Chemie, Universität Konstanz, Konstanz, Germany
| | - Christoph Paone
- Lehrstuhl Zellbiologie, Fachbereich Biologie, Universität Konstanz, Konstanz, Germany,Konstanz Research School Chemical Biology, Universität Konstanz, Konstanz, Germany
| | - Christof R. Hauck
- Lehrstuhl Zellbiologie, Fachbereich Biologie, Universität Konstanz, Konstanz, Germany,Konstanz Research School Chemical Biology, Universität Konstanz, Konstanz, Germany,Correspondence to Christof R. Hauck:
| |
Collapse
|
5
|
Partners in crime: POPX2 phosphatase and its interacting proteins in cancer. Cell Death Dis 2020; 11:840. [PMID: 33037179 PMCID: PMC7547661 DOI: 10.1038/s41419-020-03061-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2020] [Revised: 09/24/2020] [Accepted: 09/28/2020] [Indexed: 02/06/2023]
Abstract
Protein phosphorylation and dephosphorylation govern intracellular signal transduction and cellular functions. Kinases and phosphatases are involved in the regulation and development of many diseases such as Alzheimer’s, diabetes, and cancer. While the functions and roles of many kinases, as well as their substrates, are well understood, phosphatases are comparatively less well studied. Recent studies have shown that rather than acting on fewer and more distinct substrates like the kinases, phosphatases can recognize specific phosphorylation sites on many different proteins, making the study of phosphatases and their substrates challenging. One approach to understand the biological functions of phosphatases is through understanding their protein–protein interaction network. POPX2 (Partner of PIX 2; also known as PPM1F or CaMKP) is a serine/threonine phosphatase that belongs to the PP2C family. It has been implicated in cancer cell motility and invasiveness. This review aims to summarize the different binding partners of POPX2 phosphatase and explore the various functions of POPX2 through its interactome in the cell. In particular, we focus on the impact of POPX2 on cancer progression. Acting via its different substrates and interacting proteins, POPX2’s involvement in metastasis is multifaceted and varied according to the stages of metastasis.
Collapse
|
6
|
Sarmasti Emami S, Zhang D, Yang X. Interaction of the Hippo Pathway and Phosphatases in Tumorigenesis. Cancers (Basel) 2020; 12:E2438. [PMID: 32867200 PMCID: PMC7564220 DOI: 10.3390/cancers12092438] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2020] [Revised: 08/21/2020] [Accepted: 08/25/2020] [Indexed: 01/05/2023] Open
Abstract
The Hippo pathway is an emerging tumor suppressor signaling pathway involved in a wide range of cellular processes. Dysregulation of different components of the Hippo signaling pathway is associated with a number of diseases including cancer. Therefore, identification of the Hippo pathway regulators and the underlying mechanism of its regulation may be useful to uncover new therapeutics for cancer therapy. The Hippo signaling pathway includes a set of kinases that phosphorylate different proteins in order to phosphorylate and inactivate its main downstream effectors, YAP and TAZ. Thus, modulating phosphorylation and dephosphorylation of the Hippo components by kinases and phosphatases play critical roles in the regulation of the signaling pathway. While information regarding kinase regulation of the Hippo pathway is abundant, the role of phosphatases in regulating this pathway is just beginning to be understood. In this review, we summarize the most recent reports on the interaction of phosphatases and the Hippo pathway in tumorigenesis. We have also introduced challenges in clarifying the role of phosphatases in the Hippo pathway and future direction of crosstalk between phosphatases and the Hippo pathway.
Collapse
Affiliation(s)
| | | | - Xiaolong Yang
- Department of Pathology and Molecular Medicine, Queen’s University, Kingston, ON K7L 3N6, Canada; (S.S.E.); (D.Z.)
| |
Collapse
|
7
|
Kim PR, Koon YL, Lee RTC, Azizan F, Koh DHZ, Chiam KH, Koh CG. Phosphatase POPX2 interferes with cell cycle by interacting with Chk1. Cell Cycle 2020; 19:405-418. [PMID: 31944151 DOI: 10.1080/15384101.2020.1711577] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
Abstract
Protein-protein interaction network analysis plays critical roles in predicting the functions of target proteins. In this study, we used a combination of SILAC-MS proteomics and bioinformatic approaches to identify Checkpoint Kinase 1 (Chk1) as a possible POPX2 phosphatase interacting protein. POPX2 is a PP2C phosphatase that has been implicated in cancer cell invasion and migration. From the Domain-Domain Interaction (DDI) database, we first determined that the PP2C phosphatase domain interacts with Pkinase domain. Subsequently, 46 proteins with Pkinase domain were identified from POPX2 SILAC-MS data. We then narrowed down the leads and confirmed the biological interaction between Chk1 and POPX2. We also found that Chk1 is a substrate of POPX2. Chk1 is a key regulator of the cell cycle and is activated when the cell suffers DNA damage. Our approach has led us to identify POPX2 as a regulator of Chk1 and can interfere with the normal function of Chk1 at G1-S transition of the cell cycle in response to DNA damage.
Collapse
Affiliation(s)
- Pu Rum Kim
- School of Biological Sciences, Nanyang Technological University, Singapore, Singapore
| | - Yen Ling Koon
- Interdisciplinary Graduate School, Nanyang Technological University, Singapore, Singapore.,ASTAR, Biopolis, Bioinformatics Institute, Singapore, Singapore
| | | | - Farouq Azizan
- School of Biological Sciences, Nanyang Technological University, Singapore, Singapore
| | - Dylan Hong Zheng Koh
- School of Biological Sciences, Nanyang Technological University, Singapore, Singapore
| | - Keng-Hwee Chiam
- ASTAR, Biopolis, Bioinformatics Institute, Singapore, Singapore
| | - Cheng-Gee Koh
- School of Biological Sciences, Nanyang Technological University, Singapore, Singapore
| |
Collapse
|
8
|
Hou Z, Qin X, Hu Y, Zhang X, Li G, Wu J, Li J, Sha J, Chen J, Xia J, Wang L, Gao F. Longterm Exercise-Derived Exosomal miR-342-5p. Circ Res 2019; 124:1386-1400. [DOI: 10.1161/circresaha.118.314635] [Citation(s) in RCA: 121] [Impact Index Per Article: 24.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Zuoxu Hou
- From the School of Aerospace Medicine (Z.H., X.Q., Y.H., X.Z., G.L., J.W., J.L., F.G.), Fourth Military Medical University, Xi’an, China
| | - Xinghua Qin
- From the School of Aerospace Medicine (Z.H., X.Q., Y.H., X.Z., G.L., J.W., J.L., F.G.), Fourth Military Medical University, Xi’an, China
| | - Yuanyuan Hu
- From the School of Aerospace Medicine (Z.H., X.Q., Y.H., X.Z., G.L., J.W., J.L., F.G.), Fourth Military Medical University, Xi’an, China
| | - Xing Zhang
- From the School of Aerospace Medicine (Z.H., X.Q., Y.H., X.Z., G.L., J.W., J.L., F.G.), Fourth Military Medical University, Xi’an, China
| | - Guohua Li
- From the School of Aerospace Medicine (Z.H., X.Q., Y.H., X.Z., G.L., J.W., J.L., F.G.), Fourth Military Medical University, Xi’an, China
| | - Jie Wu
- From the School of Aerospace Medicine (Z.H., X.Q., Y.H., X.Z., G.L., J.W., J.L., F.G.), Fourth Military Medical University, Xi’an, China
| | - Jia Li
- From the School of Aerospace Medicine (Z.H., X.Q., Y.H., X.Z., G.L., J.W., J.L., F.G.), Fourth Military Medical University, Xi’an, China
| | - Jianding Sha
- Department of Physical Education (J.S.), Fourth Military Medical University, Xi’an, China
| | - Jiangwei Chen
- From the School of Aerospace Medicine (Z.H., X.Q., Y.H., X.Z., G.L., J.W., J.L., F.G.), Fourth Military Medical University, Xi’an, China
| | - Jielai Xia
- Department of Health Statistics (J.X.), Fourth Military Medical University, Xi’an, China
| | - Lifeng Wang
- Department of Biochemistry and Molecular Biology (L.W.), Fourth Military Medical University, Xi’an, China
| | - Feng Gao
- From the School of Aerospace Medicine (Z.H., X.Q., Y.H., X.Z., G.L., J.W., J.L., F.G.), Fourth Military Medical University, Xi’an, China
| |
Collapse
|
9
|
Rahmat MB, Zhang S, Koh CG. POPX2 is a novel LATS phosphatase that regulates the Hippo pathway. Oncotarget 2019; 10:1525-1538. [PMID: 30863499 PMCID: PMC6407677 DOI: 10.18632/oncotarget.26689] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2018] [Accepted: 02/09/2019] [Indexed: 12/23/2022] Open
Abstract
The Hippo pathway regulates cell proliferation, survival, apoptosis and differentiation. During carcinogenesis, members of the Hippo pathway are mutated to avoid anoikis and promote anchorage independent growth. Although many regulators of the Hippo pathway have been reported, negative regulators of the hippo kinases are not well studied. Through an interactome screen, we found that POPX2 phosphatase interacts with several of the Hippo pathway core kinases, including LATS1 which is the direct kinase regulating the transcription co-activators, YAP and TAZ. Phosphorylated YAP/TAZ are retained in the cytoplasm and prevented from translocation into the nucleus to activate transcription of target genes. We found that POPX2 could dephosphorylate LATS1 on Threonine-1079, leading to inactivation of LATS1 kinase. As a result, YAP/TAZ are not phosphorylated and are able to translocate into the nucleus to activate target genes involved in cell proliferation. Furthermore, POPX2 knock-out using CRISPR in the highly metastatic MDA-MB-231 breast cancer cells results in decreased cell proliferation and impairment of anchorage independent growth. We propose that POPX2 act as a suppressor of the Hippo pathway through LATS1 dephosphorylation and inactivation.
Collapse
Affiliation(s)
| | - Songjing Zhang
- School of Biological Sciences, Nanyang Technological University, Singapore
| | - Cheng-Gee Koh
- School of Biological Sciences, Nanyang Technological University, Singapore
| |
Collapse
|
10
|
Tu SH, Lin YC, Huang CC, Yang PS, Chang HW, Chang CH, Wu CH, Chen LC, Ho YS. Protein phosphatase Mg2+/Mn2+ dependent 1F promotes smoking-induced breast cancer by inactivating phosphorylated-p53-induced signals. Oncotarget 2018; 7:77516-77531. [PMID: 27769050 PMCID: PMC5363601 DOI: 10.18632/oncotarget.12717] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2016] [Accepted: 10/04/2016] [Indexed: 12/24/2022] Open
Abstract
We previously demonstrated that the activation of α9-nicotinic acetylcholine receptor (α9-nAchR) signaling by smoking promotes breast cancer formation. To investigate the downstream signaling molecules involved in α9-nAChR-induced breast tumorigenesis, we used real-time polymerase chain reactions and Western blotting to assess expression of protein phosphatase Mg2+/Mn2+ dependent 1F (PPM1F), a Ser/Thr protein phosphatase, in human breast cancer samples (n=167). Additionally, stable PPM1F-knockdown and -overexpressing cell lines were established to evaluate the function of PPM1F. The phosphatase activity of PPM1F in nicotine-treated cells was assessed through Western blotting, confocal microscopy, and fluorescence resonance energy transfer. Higher levels of PPM1F were detected in the breast cancer tissues of heavy smokers (n=7, 12.8-fold) greater than of non-smokers (n= 28, 6.3-fold) (**p=0.01). In vitro, nicotine induced PPM1F expression, whereas α9-nAChR knockdown reduced the protein expression of PPM1F. A series of biochemical experiments using nicotine-treated cells suggested that the dephosphorylation of p53 (Ser-20) and BAX (Ser-184) by PPM1F is a critical posttranslational modification, as observed in breast cancer patients who were heavy smokers. These observations indicate that PPM1F may be a mediator downstream of α9-nAChR that activates smoking-induced carcinogenic signals. Thus, PPM1F expression could be used for prognostic diagnosis or inhibited for cancer prevention and therapy.
Collapse
Affiliation(s)
- Shih-Hsin Tu
- Department of Surgery, School of Medicine, College of Medicine, Taipei Medical University, Taipei, Taiwan.,Breast Medical Center, Taipei Medical University Hospital, Taipei, Taiwan.,Taipei Cancer Center, Taipei Medical University, Taipei, Taiwan
| | - Yin-Ching Lin
- Graduate Institute of Medical Sciences, College of Medicine, Taipei Medical University, Taipei, Taiwan
| | - Chi-Cheng Huang
- Department of Surgery, School of Medicine, College of Medicine, Taipei Medical University, Taipei, Taiwan.,School of Medicine, College of Medicine, Fu-Jen Catholic University, New Taipei City, Taiwan.,Breast Center, Cathay General Hospital, Taipei, Taiwan
| | - Po-Sheng Yang
- Department of Surgery, Mackay Memorial Hospital, Taipei, Taiwan.,Department of Medicine, Mackay Medical College, New Taipei City, Taiwan
| | - Hui-Wen Chang
- Department of Laboratory Medicine, Taipei Medical University Hospital, Taipei, Taiwan
| | - Chien-Hsi Chang
- Department of Laboratory Medicine, Taipei Medical University Hospital, Taipei, Taiwan
| | - Chih-Hsiung Wu
- Department of Surgery, School of Medicine, College of Medicine, Taipei Medical University, Taipei, Taiwan.,Department of Surgery, En Chu Kong Hospital, New Taipei City, Taiwan
| | - Li-Ching Chen
- Breast Medical Center, Taipei Medical University Hospital, Taipei, Taiwan.,Taipei Cancer Center, Taipei Medical University, Taipei, Taiwan.,Graduate Institute of Clinical Medicine, College of Medicine, Taipei Medical University, Taipei, Taiwan
| | - Yuan-Soon Ho
- Graduate Institute of Medical Sciences, College of Medicine, Taipei Medical University, Taipei, Taiwan.,Department of Laboratory Medicine, Taipei Medical University Hospital, Taipei, Taiwan.,Comprehensive Cancer Center of Taipei Medical University, Taipei, Taiwan.,School of Medical Laboratory Science and Biotechnology, College of Medical Science and Technology, Taipei Medical University, Taipei, Taiwan
| |
Collapse
|
11
|
Zhang J, Jin M, Chen X, Zhang R, Huang Y, Liu H, Zhu J. Loss of PPM1F expression predicts tumour recurrence and is negatively regulated by miR-590-3p in gastric cancer. Cell Prolif 2018; 51:e12444. [PMID: 29473240 DOI: 10.1111/cpr.12444] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2017] [Revised: 01/15/2018] [Indexed: 12/25/2022] Open
Abstract
OBJECTIVES MicroRNAs (miRNAs) as small non-coding RNA molecules act by negatively regulating their target genes. Recent studies have shown that protein phosphatase Mg2+/Mn2+-dependent 1F (PPM1F) plays a critical role in cancer metastasis. But, the regulation mechanisms of PPM1F by miRNAs in gastric cancer (GC) remain undefined. METHODS The correlation of PPM1F or miR-590-3p (miR-590) expression with clinicopathological features and prognosis of the patients with GC was analysed by TCGA RNA-sequencing data. The miRNAs that target PPM1F gene were identified by bioinformatics and Spearman correlation analysis, and the binding site between miR-590 and PPM1F 3'UTR was confirmed by dual luciferase assay. MTT and Transwell assays were conducted to evaluate the effects of miR-590 or (and) PPM1F on cell proliferation and invasion. RESULTS We found that PPM1F expression was downregulated in GC tissues and cell lines and was correlated with tumour recurrence in patients with GC. The decreased expression of PPM1F was attributed to the dysregulation of miR-590 expression rather than its genetic or epigenetic alterations. Overexpression of miR-590 promoted cell proliferation and invasion capability of GC cells, while knockdown of miR-590 reversed these effects. Moreover, PPM1F was validated as a direct target of miR-590 and counteracted the tumour-promoting effects caused by miR-590. The expression of miR-590 presented the negative correlation with PPM1F expression and acted as an independent prognostic factor for tumour recurrence in patients with GC. CONCLUSION PPM1F may function as a suppressive factor and is negatively regulated by miR-590 in GC.
Collapse
Affiliation(s)
- Jing Zhang
- Department of Gastroenterology, Shanghai Jiao Tong University Affiliated Sixth People's Hospital, Shanghai, China
| | - Ming Jin
- Department of Clinical Medicine, Ningbo University School of Medicine, Ningbo, China
| | - Xiaoyu Chen
- Department of Gastroenterology, Shanghai Jiao Tong University Affiliated Sixth People's Hospital, Shanghai, China
| | - Rui Zhang
- Department of Gastroenterology, Shanghai Jiao Tong University Affiliated Sixth People's Hospital, Shanghai, China
| | - Yanxia Huang
- Department of Gastroenterology, Shanghai Jiao Tong University Affiliated Sixth People's Hospital, Shanghai, China
| | - Hui Liu
- Department of Gastroenterology, Shanghai Jiao Tong University Affiliated Sixth People's Hospital, Shanghai, China
| | - Jinshui Zhu
- Department of Gastroenterology, Shanghai Jiao Tong University Affiliated Sixth People's Hospital, Shanghai, China
| |
Collapse
|
12
|
Functions and dysfunctions of Ca2+/calmodulin-dependent protein kinase phosphatase (CaMKP/PPM1F) and CaMKP-N/PPM1E. Arch Biochem Biophys 2018; 640:83-92. [DOI: 10.1016/j.abb.2018.01.001] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2017] [Revised: 12/28/2017] [Accepted: 01/04/2018] [Indexed: 12/22/2022]
|
13
|
POPX2 phosphatase regulates apoptosis through the TAK1-IKK-NF-κB pathway. Cell Death Dis 2017; 8:e3051. [PMID: 28906490 PMCID: PMC5636987 DOI: 10.1038/cddis.2017.443] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2017] [Revised: 07/11/2017] [Accepted: 07/31/2017] [Indexed: 01/07/2023]
Abstract
Chemoresistance is one of the leading causes that contributes to tumor relapse and poor patient outcome after several rounds of drug therapy. The causes of chemoresistance are multi-factorial. Ultimately, it is the balance of pro- and anti-apoptotic activities in the cells. We have previously reported links between POPX2 serine/threonine phosphatase with cell motility and invasiveness of breast cancer cells. Here, we show that POPX2 plays a role in the regulation of apoptosis. The effect of POPX2 on apoptosis centers on the inactivation of TGF-β activated kinase (TAK1). TAK1 is essential for several important biological functions including innate immunity, development and cell survival. We find that POPX2 interacts directly with TAK1 and is able to dephosphorylate TAK1. Cells with lower levels of POPX2 exhibit higher TAK1 activity in response to etoposide (VP-16) treatment. This subsequently leads to increased translocation of NF-κB from the cytosol to the nucleus. Consequently, NF-κB-mediated transcription of anti-apoptotic proteins is upregulated to promote cell survival. On the other hand, cells with higher levels of POPX2 are more vulnerable to apoptosis induced by etoposide. Our data demonstrate that POPX2 is a negative regulator of TAK1 signaling pathway and modulates apoptosis through the regulation of TAK1 activity. As inhibition of TAK1 has been proposed to reduce chemoresistance and increase sensitivity to chemotherapy in certain types of cancer, modulation of POPX2 levels may provide an additional avenue and consideration in fine-tuning therapeutic response.
Collapse
|
14
|
Zhang S, Weng T, Cheruba E, Guo T, Chan H, Sze SK, Koh CG. Phosphatase POPX2 Exhibits Dual Regulatory Functions in Cancer Metastasis. J Proteome Res 2016; 16:698-711. [PMID: 27976581 DOI: 10.1021/acs.jproteome.6b00748] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Cancer metastasis is a complex mechanism involving multiple processes. Previously, our integrative proteome, transcriptome, and phosphoproteome study reported that the levels of serine/threonine phosphatase POPX2 were positively correlated with cancer cell motility through modulating MAPK signaling. Surprisingly, here we found that POPX2 knockdown cells induced more numerous and larger tumor nodules in lungs in longer term animal studies. Interestingly, our analysis of DNA microarray data from cancer patient samples that are available in public databases shows that low POPX2 expression is linked to distant metastasis and poor survival rate. These observations suggest that lower levels of POPX2 may favor tumor progression in later stages of metastasis. We hypothesize that POPX2 may do so by modulation of angiogenesis. Secretome analysis of POPX2-knockdown MDA-MB-231 cells using LC-MS/MS-based SILAC quantitative proteomics and cytokine array show that silencing of POPX2 leads to increased secretion of exosomes, which may, in turn, induce multiple pro-angiogenic cytokines. This study, combined with our previous findings, suggests that a single ubiquitously expressed phosphatase POPX2 influences cancer metastasis via modulating multiple biological processes including MAPK signaling and exosome cytokine secretion.
Collapse
Affiliation(s)
- Songjing Zhang
- School of Biological Sciences, Nanyang Technological University , Singapore 637551.,Mechanobiology Institute , Singapore 117411
| | - Ting Weng
- School of Biological Sciences, Nanyang Technological University , Singapore 637551.,Mechanobiology Institute , Singapore 117411
| | | | - Tiannan Guo
- School of Biological Sciences, Nanyang Technological University , Singapore 637551
| | - Hei Chan
- School of Biological Sciences, Nanyang Technological University , Singapore 637551
| | - Siu Kwan Sze
- School of Biological Sciences, Nanyang Technological University , Singapore 637551
| | - Cheng-Gee Koh
- School of Biological Sciences, Nanyang Technological University , Singapore 637551.,Mechanobiology Institute , Singapore 117411
| |
Collapse
|
15
|
Sulaiman SA, Ab Mutalib NS, Jamal R. miR-200c Regulation of Metastases in Ovarian Cancer: Potential Role in Epithelial and Mesenchymal Transition. Front Pharmacol 2016; 7:271. [PMID: 27601996 PMCID: PMC4993756 DOI: 10.3389/fphar.2016.00271] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2016] [Accepted: 08/10/2016] [Indexed: 12/20/2022] Open
Abstract
Among the gynecological malignancies, ovarian cancer is the most fatal due to its high mortality rate. Most of the identified cases are epithelial ovarian cancer (EOC) with five distinct subtypes: high-grade serous carcinoma, low-grade serous carcinoma, mucinous carcinoma, endometrioid carcinoma, and clear-cell carcinoma. Lack of an early diagnostic approach, high incidence of tumor relapse and the heterogenous characteristics between each EOC subtypes contribute to the difficulties in developing precise intervention and therapy for the patients. MicroRNAs (miRNAs) are single-stranded RNAs that have been shown to function as tumor suppressors or oncomiRs. The miR-200 family, especially miR-200c, has been shown to be implicated in the metastasis and invasion of ovarian carcinoma due to its functional regulation of epithelial-to-mesenchymal transition (EMT). This mini review is aimed to summarize the recent findings of the miR-200c functional role as well as its validated targets in the metastasis cascade of ovarian cancer, with a focus on EMT regulation. The potential of this miRNA in early diagnosis and its dual expression status are also discussed.
Collapse
Affiliation(s)
- Siti A Sulaiman
- UKM Medical Molecular Biology Institute, UKM Medical Centre, Universiti Kebangsaan Malaysia Kuala Lumpur, Malaysia
| | - Nurul-Syakima Ab Mutalib
- UKM Medical Molecular Biology Institute, UKM Medical Centre, Universiti Kebangsaan Malaysia Kuala Lumpur, Malaysia
| | - Rahman Jamal
- UKM Medical Molecular Biology Institute, UKM Medical Centre, Universiti Kebangsaan Malaysia Kuala Lumpur, Malaysia
| |
Collapse
|
16
|
Saito F, Araki K, Yokobori T, Ishii N, Tsukagoshi M, Watanabe A, Kubo N, Altan B, Shirabe K, Kuwano H. High expression of karyopherin-α2 and stathmin 1 is associated with proliferation potency and transformation in the bile duct and gall bladder epithelia in the cases of pancreaticobiliary maljunction. J Surg Oncol 2016; 114:462-8. [DOI: 10.1002/jso.24330] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2016] [Accepted: 06/05/2016] [Indexed: 01/07/2023]
Affiliation(s)
- Fumiyoshi Saito
- Department of General Surgical Science; Graduate School of Medicine; Gunma University; Showamachi, Maebashi Gunma Japan
- Department of Hepatobiliary and Pancreatic Surgery; Graduate School of Medicine; Gunma University; Maebashi Gunma Japan
| | - Kenichiro Araki
- Department of General Surgical Science; Graduate School of Medicine; Gunma University; Showamachi, Maebashi Gunma Japan
- Department of Hepatobiliary and Pancreatic Surgery; Graduate School of Medicine; Gunma University; Maebashi Gunma Japan
| | - Takehiko Yokobori
- Department of Molecular Pharmacology and Oncology; Graduate School of Medicine; Gunma University; Maebashi Gunma Japan
| | - Norihiro Ishii
- Department of General Surgical Science; Graduate School of Medicine; Gunma University; Showamachi, Maebashi Gunma Japan
- Department of Hepatobiliary and Pancreatic Surgery; Graduate School of Medicine; Gunma University; Maebashi Gunma Japan
| | - Mariko Tsukagoshi
- Department of General Surgical Science; Graduate School of Medicine; Gunma University; Showamachi, Maebashi Gunma Japan
- Department of Hepatobiliary and Pancreatic Surgery; Graduate School of Medicine; Gunma University; Maebashi Gunma Japan
| | - Akira Watanabe
- Department of General Surgical Science; Graduate School of Medicine; Gunma University; Showamachi, Maebashi Gunma Japan
- Department of Hepatobiliary and Pancreatic Surgery; Graduate School of Medicine; Gunma University; Maebashi Gunma Japan
| | - Norio Kubo
- Department of General Surgical Science; Graduate School of Medicine; Gunma University; Showamachi, Maebashi Gunma Japan
- Department of Hepatobiliary and Pancreatic Surgery; Graduate School of Medicine; Gunma University; Maebashi Gunma Japan
| | - Bolag Altan
- Department of General Surgical Science; Graduate School of Medicine; Gunma University; Showamachi, Maebashi Gunma Japan
| | - Ken Shirabe
- Department of Hepatobiliary and Pancreatic Surgery; Graduate School of Medicine; Gunma University; Maebashi Gunma Japan
| | - Hiroyuki Kuwano
- Department of General Surgical Science; Graduate School of Medicine; Gunma University; Showamachi, Maebashi Gunma Japan
| |
Collapse
|
17
|
Zhou Y, Deng X, Zang N, Li H, Li G, Li C, He M. Transcriptomic and Proteomic Investigation of HSP90A as a Potential Biomarker for HCC. Med Sci Monit 2015; 21:4039-49. [PMID: 26704341 PMCID: PMC4694708 DOI: 10.12659/msm.896712] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
Background Hepatocellular carcinoma (HCC) is the third most frequent cause of cancer-related death in adults. Despite recent advances in the clinical technologies, the screening and diagnostic efficacy for HCC remains poor. Discovering novel and reliable HCC biomarkers is urgently needed. Material/Methods We performed a transcriptome-proteome integrated assay to track the possible HCC biomarkers from the process of HCC-derived gene expression in malignant cells to its protein product released into serum. Results Our screening results demonstrated that heat shock protein 90A (HSP90A), which participates in the PI3K-Akt signaling pathway and many other cancer-related pathways, warrants further investigation. The expression of HSP90A was increased in the HCC cells, serum, and tissues. Immunohistochemistry analysis on 76 clinical tissue samples also suggested the relevance between HSP90A expression and HCC metastatic behavior. Conclusions These findings suggest a role for HSP90A in HCC pathogenesis and the potential use of HSP90A for the screening and diagnosis of this malignancy.
Collapse
Affiliation(s)
- Yi Zhou
- Medical Scientific Research Center of Guangxi Medical University, Nanning, Guangxi, China (mainland)
| | - Xiaofang Deng
- School of Public Health, Guangxi Medical University, Nanning, Guangxi, China (mainland)
| | - Ning Zang
- Medical Scientific Research Center of Guangxi Medical University, Nanning, Guangxi, China (mainland)
| | - Hongtao Li
- Medical Scientific Research Center of Guangxi Medical University, Nanning, Guangxi, China (mainland)
| | - Gang Li
- Medical Scientific Research Center of Guangxi Medical University, Nanning, Guangxi, China (mainland)
| | - Cuiping Li
- School of Public Health, Guangxi Medical University, Nanning, Guangxi, China (mainland)
| | - Min He
- Key Laboratory of High-Incidence Tumor Prevention & Treatment (Guangxi Medical University), Ministry of Education, Nanning, Guangxi, China (mainland)
| |
Collapse
|
18
|
Phang HQ, Hoon JL, Lai SK, Zeng Y, Chiam KH, Li HY, Koh CG. POPX2 phosphatase regulates the KIF3 kinesin motor complex. J Cell Sci 2013; 127:727-39. [DOI: 10.1242/jcs.126482] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
The kinesin motors are important in the regulation of cellular functions such as protein trafficking, spindle organization and centrosome separation. In this study, we have identified POPX2, a serine-threonine phosphatase, as an interacting partner of the KAP3 subunit of the kinesin-2 motor. The kinesin-2 motor is a heterotrimeric complex composed of KIF3A, KIF3B motor subunits and KAP3, the non-motor subunit, which binds the cargo. Here we report that the phosphatase POPX2 is a negative regulator of the trafficking of N-cadherin and other cargoes; consequently, it markedly influences cell-cell adhesion. POPX2 affects trafficking by determining the phosphorylation status of KIF3A at serine-690. This is consistent with the observation that KIF3A-S690A mutant is defective in cargo trafficking. Our studies also implicate CaMKII as the kinase that phosphorylates KIF3A at serine-690. These results strongly suggest POPX2 and CaMKII as the phosphatase-kinase pair that regulates kinesin-mediated transport and cell-cell adhesion.
Collapse
|