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He L, Takahashi K, Pasic L, Narui C, Ellinger P, Grundmann M, Takahashi T. The effects of CD148 Q276P/R326Q polymorphisms in A431D epidermoid cancer cell proliferation and epidermal growth factor receptor signaling. Cancer Rep (Hoboken) 2021; 5:e1566. [PMID: 34791835 PMCID: PMC9458507 DOI: 10.1002/cnr2.1566] [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: 06/11/2021] [Revised: 08/16/2021] [Accepted: 09/21/2021] [Indexed: 11/12/2022] Open
Abstract
BACKGROUND CD148 is a transmembrane protein tyrosine phosphatase that is expressed in multiple cell types. Previous studies have shown that CD148 dephosphorylates growth factor receptors and their signaling molecules, including EGFR and ERK1/2, and negatively regulates cancer cell growth. Furthermore, research of clinical patients has shown that highly linked CD148 gene polymorphisms, Gln276Pro (Q276P) and Arg326Gln (R326Q), are associated with an increased risk of several types of cancer. However, the biological effects of these missense mutations have not been studied. AIM We aimed to determine the biological effects of CD148 Q276P/R326Q mutations in cancer cell proliferation and growth factor signaling, with emphasis on EGFR signaling. METHODS CD148 forms, wild-type (WT) or Q276P/R326Q, were retrovirally introduced into A431D epidermoid carcinoma cells that lacks CD148 expression. The stable cells that express comparable levels of CD148 were sorted by flow cytometry. A431D cells infected with empty retrovirus was used as a control. CD148 localization, cell proliferation rate, EGFR signaling, and the response to thrombospondin-1 (TSP1), a CD148 ligand, were assessed by immunostaining, cell proliferation assay, enzyme-linked immunosorbent assay, and Western blotting. RESULTS Both CD148 forms (WT, Q276P/R326Q) were distributed to cell surface and all three cell lines expressed same level of EGFR. Compared to control cells, the A431D cells that express CD148 forms showed significantly lower cell proliferation rates. EGF-induced EGFR and ERK1/2 phosphorylation as well as cell proliferation were also significantly reduced in these cells. Furthermore, TSP1 inhibited cell proliferation in CD148 (WT, Q276P/R326Q)-expressing A431D cells, while it showed no effects in control cells. However, significant differences were not observed between CD148 WT and Q276P/R326Q cells. CONCLUSION Our data demonstrates that Q276P/R326Q mutations do not have major effects on TSP1-CD148 interaction as well as on CD148's cellular localization and activity to inhibit EGFR signaling and cell proliferation.
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Affiliation(s)
- Lilly He
- Division of Nephrology and Hypertension, Vanderbilt University Medical Center, Nashville, Tennessee, USA
| | - Keiko Takahashi
- Division of Nephrology and Hypertension, Vanderbilt University Medical Center, Nashville, Tennessee, USA
| | - Lejla Pasic
- Department of Biochemistry, Vanderbilt University, Nashville, Tennessee, USA
| | - Chikage Narui
- Division of Nephrology and Hypertension, Vanderbilt University Medical Center, Nashville, Tennessee, USA
| | - Philipp Ellinger
- Bayer AG Research & Development, Pharmaceuticals, Wuppertal, Germany
| | - Manuel Grundmann
- Bayer AG Research & Development, Pharmaceuticals, Wuppertal, Germany
| | - Takamune Takahashi
- Division of Nephrology and Hypertension, Vanderbilt University Medical Center, Nashville, Tennessee, USA
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Nakatani T, Iwasaki M, Yamamichi A, Yoshioka Y, Uesaka T, Bitoh Y, Maeda K, Fukumoto T, Takemoto T, Enomoto H. Point mutagenesis in mouse reveals contrasting pathogenetic effects between MEN2B‐ and Hirschsprung disease‐associated missense mutations of the
RET
gene. Dev Growth Differ 2020; 62:214-222. [DOI: 10.1111/dgd.12664] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2020] [Accepted: 03/28/2020] [Indexed: 01/06/2023]
Affiliation(s)
- Taichi Nakatani
- Division for Neural Differentiation and Regeneration Department of Physiology and Cell Biology Kobe University Graduate School of Medicine Kobe Japan
- Division of Pediatric Surgery Department of Surgery Kobe University Graduate School of Medicine Kobe Japan
| | - Mitsuhiro Iwasaki
- Division for Neural Differentiation and Regeneration Department of Physiology and Cell Biology Kobe University Graduate School of Medicine Kobe Japan
| | - Atsuhiro Yamamichi
- Division for Neural Differentiation and Regeneration Department of Physiology and Cell Biology Kobe University Graduate School of Medicine Kobe Japan
| | - Yuta Yoshioka
- Division for Neural Differentiation and Regeneration Department of Physiology and Cell Biology Kobe University Graduate School of Medicine Kobe Japan
| | - Toshihiro Uesaka
- Division for Neural Differentiation and Regeneration Department of Physiology and Cell Biology Kobe University Graduate School of Medicine Kobe Japan
| | - Yuko Bitoh
- Division of Pediatric Surgery Department of Surgery Kobe University Graduate School of Medicine Kobe Japan
| | - Kosaku Maeda
- Department of Surgery Hyogo Prefectural Kobe Children's Hospital Kobe Japan
| | - Takumi Fukumoto
- Division of Hepato‐Biliary‐Pancreatic surgery Department of Physiology and Cell Biology Kobe University Graduate School of Medicine Kobe Japan
| | - Tatsuya Takemoto
- Institute of Advanced Medical Sciences Tokushima University Tokushima Japan
| | - Hideki Enomoto
- Division for Neural Differentiation and Regeneration Department of Physiology and Cell Biology Kobe University Graduate School of Medicine Kobe Japan
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3
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Iervolino A, Iuliano R, Trapasso F, Viglietto G, Melillo RM, Carlomagno F, Santoro M, Fusco A. Retraction: The Receptor-Type Protein Tyrosine Phosphatase J Antagonizes the Biochemical and Biological Effects of RET-Derived Oncoproteins. Cancer Res 2018; 78:6907. [PMID: 30552125 DOI: 10.1158/0008-5472.can-18-3456] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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4
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Sala M, Spensiero A, Scala MC, Pepe G, Bilotta A, Paduano F, D'Agostino S, Lanzillotta D, Bertamino A, Novellino E, Trapasso F, Gomez-Monterrey IM, Campiglia P. Design, Synthesis, Biological Activity, and Structural Analysis of Lactam-Constrained PTPRJ Agonist Peptides. ChemMedChem 2018; 13:1673-1680. [PMID: 29888867 DOI: 10.1002/cmdc.201800147] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2018] [Revised: 05/25/2018] [Indexed: 01/13/2023]
Abstract
PTPRJ is a receptor-like protein tyrosine phosphatase mainly known for its antiproliferative and tumor-suppressive functions. PTPRJ dephosphorylates several growth factors and their receptors, negatively regulating cell proliferation and migration. We recently identified a disulfide-bridged nonapeptide, named PTPRJ-19 (H-[Cys-His-His-Asn-Leu-Thr-His-Ala-Cys]-OH), which activates PTPRJ, thereby causing cell growth inhibition and apoptosis of both cancer and endothelial cells. With the aim of replacing the disulfide bridge by a chemically more stable moiety, we have synthesized and tested a series of lactam analogues of PTPRJ-19. This replacement led to analogues with higher activity and greater stability than the parent peptide.
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Affiliation(s)
- Marina Sala
- Department of Pharmacy, University of Salerno, 84084, Fisciano (SA), Italy
| | - Antonia Spensiero
- Department of Pharmacy, University of Salerno, 84084, Fisciano (SA), Italy
| | | | - Giacomo Pepe
- Department of Pharmacy, University of Salerno, 84084, Fisciano (SA), Italy
| | - Anna Bilotta
- Department of Medicina Sperimentale e Clinica, University Magna Graecia, Campus "S. Venuta", 88100, Catanzaro, Italy
| | - Francesco Paduano
- Department of Medicina Sperimentale e Clinica, University Magna Graecia, Campus "S. Venuta", 88100, Catanzaro, Italy
| | - Sabrina D'Agostino
- Department of Medicina Sperimentale e Clinica, University Magna Graecia, Campus "S. Venuta", 88100, Catanzaro, Italy
| | - Delia Lanzillotta
- Department of Medicina Sperimentale e Clinica, University Magna Graecia, Campus "S. Venuta", 88100, Catanzaro, Italy
| | - Alessia Bertamino
- Department of Pharmacy, University of Salerno, 84084, Fisciano (SA), Italy
| | - Ettore Novellino
- Department of Pharmacy, University of Naples "Federico II", 80131, Naples, Italy
| | - Francesco Trapasso
- Department of Medicina Sperimentale e Clinica, University Magna Graecia, Campus "S. Venuta", 88100, Catanzaro, Italy
| | | | - Pietro Campiglia
- Department of Pharmacy, University of Salerno, 84084, Fisciano (SA), Italy
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5
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The receptor protein tyrosine phosphatase PTPRJ negatively modulates the CD98hc oncoprotein in lung cancer cells. Oncotarget 2018; 9:23334-23348. [PMID: 29805737 PMCID: PMC5955124 DOI: 10.18632/oncotarget.25101] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2017] [Accepted: 03/24/2018] [Indexed: 01/16/2023] Open
Abstract
PTPRJ, a receptor protein tyrosine phosphatase strongly downregulated in human cancer, displays tumor suppressor activity by negatively modulating several proteins involved in proliferating signals. Here, through a proteomic-based approach, we identified a list of potential PTPRJ-interacting proteins and among them we focused on CD98hc, a type II glycosylated integral membrane protein encoded by SLC3A2, corresponding to the heavy chain of a heterodimeric transmembrane amino-acid transporter, including LAT1. CD98hc is widely overexpressed in several types of cancers and contributes to the process of tumorigenesis by interfering with cell proliferation, adhesion, and migration. We first validated PTPRJ-CD98hc interaction, then demonstrated that PTPRJ overexpression dramatically reduces CD98hc protein levels in A549 lung cancer cells. In addition, following to the treatment of PTPRJ-transduced cells with MG132, a proteasome inhibitor, CD98hc levels did not decrease compared to controls, indicating that PTPRJ is involved in the regulation of CD98hc proteasomal degradation. Moreover, PTPRJ overexpression combined with CD98hc silencing consistently reduced cell proliferation and triggered apoptosis of lung cancer cells. Interestingly, by interrogating the can Evolve database, we observed an inverse correlation between PTPRJ and SLC3A2 gene expression. Indeed, the non-small cell lung cancers (NSCLCs) of patients showing a short survival rate express the lowest and the highest levels of PTPRJ and SLC3A2, respectively. Therefore, the results reported here contribute to shed lights on PTPRJ signaling in cancer cells: moreover, our findings also support the development of a novel anticancer therapeutic approach by targeting the pathway of PTPRJ that is usually downregulated in highly malignant human neoplasias.
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6
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Bilotta A, Dattilo V, D'Agostino S, Belviso S, Scalise S, Bilotta M, Gaudio E, Paduano F, Perrotti N, Florio T, Fusco A, Iuliano R, Trapasso F. A novel splice variant of the protein tyrosine phosphatase PTPRJ that encodes for a soluble protein involved in angiogenesis. Oncotarget 2018; 8:10091-10102. [PMID: 28052032 PMCID: PMC5354644 DOI: 10.18632/oncotarget.14350] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2016] [Accepted: 12/13/2016] [Indexed: 02/01/2023] Open
Abstract
PTPRJ is a receptor protein tyrosine phosphatase with tumor suppressor activity. Very little is known about the role of PTPRJ ectodomain, although recently both physiological and synthetic PTPRJ ligands have been identified. A putative shorter spliced variant, coding for a 539 aa protein corresponding to the extracellular N-terminus of PTPRJ, is reported in several databases but, currently, no further information is available. Here, we confirmed that the PTPRJ short isoform (named sPTPRJ) is a soluble protein secreted into the supernatant of both endothelial and tumor cells. Like PTPRJ, also sPTPRJ undergoes post-translational modifications such as glycosylation, as assessed by sPTPRJ immunoprecipitation. To characterize its functional activity, we performed an endothelial cell tube formation assay and a wound healing assay on HUVEC cells overexpressing sPTPRJ and we found that sPTPRJ has a proangiogenic activity. We also showed that sPTPRJ expression down-regulates endothelial adhesion molecules, that is a hallmark of proangiogenic activity. Moreover, sPTPRJ mRNA levels in human high-grade glioma, one of the most angiogenic tumors, are higher in tumor samples compared to controls. Further studies will be helpful not only to clarify the way sPTPRJ works but also to supply clues to circumvent its activity in cancer therapy.
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Affiliation(s)
- Anna Bilotta
- Department of Medicina Sperimentale e Clinica, University Magna Graecia of Catanzaro, Catanzaro, Italy
| | - Vincenzo Dattilo
- Department of Scienze della Salute, University Magna Graecia of Catanzaro, Catanzaro, Italy
| | - Sabrina D'Agostino
- Department of Medicina Sperimentale e Clinica, University Magna Graecia of Catanzaro, Catanzaro, Italy
| | - Stefania Belviso
- Department of Medicina Sperimentale e Clinica, University Magna Graecia of Catanzaro, Catanzaro, Italy
| | - Stefania Scalise
- Department of Medicina Sperimentale e Clinica, University Magna Graecia of Catanzaro, Catanzaro, Italy
| | - Mariaconcetta Bilotta
- Department of Medicina Sperimentale e Clinica, University Magna Graecia of Catanzaro, Catanzaro, Italy
| | - Eugenio Gaudio
- Department of Medicina Sperimentale e Clinica, University Magna Graecia of Catanzaro, Catanzaro, Italy.,Lymphoma and Genomics Research Program, Institute of Oncology Research (IOR), Bellinzona, Switzerland
| | - Francesco Paduano
- Department of Medicina Sperimentale e Clinica, University Magna Graecia of Catanzaro, Catanzaro, Italy.,Tecnologica Research Institute, Biomedical Section, Crotone, Italy
| | - Nicola Perrotti
- Department of Scienze della Salute, University Magna Graecia of Catanzaro, Catanzaro, Italy
| | - Tullio Florio
- Laboratory of Pharmacology, Dept. of Internal Medicine, and Center of Excellence for Biomedical Research (CEBR), University of Genova, Genova, Italy
| | - Alfredo Fusco
- Istituto di Endocrinologia e Oncologia Sperimentale - CNR c/o Dipartimento di Medicina Molecolare e Biotecnologie Mediche, University Federico II of Napoli, Napoli, Italy
| | - Rodolfo Iuliano
- Department of Medicina Sperimentale e Clinica, University Magna Graecia of Catanzaro, Catanzaro, Italy
| | - Francesco Trapasso
- Department of Medicina Sperimentale e Clinica, University Magna Graecia of Catanzaro, Catanzaro, Italy
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7
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Meeusen B, Janssens V. Tumor suppressive protein phosphatases in human cancer: Emerging targets for therapeutic intervention and tumor stratification. Int J Biochem Cell Biol 2017; 96:98-134. [PMID: 29031806 DOI: 10.1016/j.biocel.2017.10.002] [Citation(s) in RCA: 62] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2017] [Revised: 10/04/2017] [Accepted: 10/05/2017] [Indexed: 02/06/2023]
Abstract
Aberrant protein phosphorylation is one of the hallmarks of cancer cells, and in many cases a prerequisite to sustain tumor development and progression. Like protein kinases, protein phosphatases are key regulators of cell signaling. However, their contribution to aberrant signaling in cancer cells is overall less well appreciated, and therefore, their clinical potential remains largely unexploited. In this review, we provide an overview of tumor suppressive protein phosphatases in human cancer. Along their mechanisms of inactivation in defined cancer contexts, we give an overview of their functional roles in diverse signaling pathways that contribute to their tumor suppressive abilities. Finally, we discuss their emerging roles as predictive or prognostic markers, their potential as synthetic lethality targets, and the current feasibility of their reactivation with pharmacologic compounds as promising new cancer therapies. We conclude that their inclusion in clinical practice has obvious potential to significantly improve therapeutic outcome in various ways, and should now definitely be pushed forward.
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Affiliation(s)
- Bob Meeusen
- Laboratory of Protein Phosphorylation & Proteomics, Dept. of Cellular & Molecular Medicine, Faculty of Medicine, KU Leuven & Leuven Cancer Institute (LKI), KU Leuven, Belgium
| | - Veerle Janssens
- Laboratory of Protein Phosphorylation & Proteomics, Dept. of Cellular & Molecular Medicine, Faculty of Medicine, KU Leuven & Leuven Cancer Institute (LKI), KU Leuven, Belgium.
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8
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Zhang XF, Tu R, Li K, Ye P, Cui X. Tumor Suppressor PTPRJ Is a Target of miR-155 in Colorectal Cancer. J Cell Biochem 2017; 118:3391-3400. [PMID: 28316102 DOI: 10.1002/jcb.25995] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2016] [Accepted: 03/16/2017] [Indexed: 01/02/2023]
Abstract
PTPRJ is known for its antiproliferative role. Loss of heterozygosity (LOH) of PTPRJ has frequently been observed in various human cancers including colorectal cancer (CRC), lung cancer, and breast cancer. However, the function and mechanism of PTPRJ in CRC are not well understood. At the present study, we show that ectopic expression of PTPRJ inhibits cell growth, migration, and invasiveness in CRC cell line HCT116. Moreover, PTPRJ inhibits the tumorigenecity of HCT116 in a xenograft tumor model. MiR-155, the well-known oncomiR in CRC, is identified as an upstream factor of PTPRJ. MiR-155 directly binds to the 3' untranslated region of PTPRJ mRNA and suppresses the mRNA and protein levels of PTPRJ. Furthermore, the growth-promoting and AKT signaling activation effect of miR-155 was abrogated by PTPRJ overexpression, and vice versa. Our study reveals the crucial role of miR-155/PTPRJ/AKT axis in proliferation and migration of CRC cells and suggests a therapeutic potential of PTPRJ. J. Cell. Biochem. 118: 3391-3400, 2017. © 2017 Wiley Periodicals, Inc.
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Affiliation(s)
- Xiao-Fei Zhang
- School of Chemistry, Chemical Engineering and Life Sciences, Wuhan University of Technology, Wuhan 430072, P. R. China
| | - Rongfu Tu
- College of Life Sciences, Wuhan University, Wuhan 430070, P. R. China
| | - Keke Li
- College of Life Sciences, Wuhan University, Wuhan 430070, P. R. China
| | - Pengxiang Ye
- School of Chemistry, Chemical Engineering and Life Sciences, Wuhan University of Technology, Wuhan 430072, P. R. China
| | - Xiaofeng Cui
- School of Chemistry, Chemical Engineering and Life Sciences, Wuhan University of Technology, Wuhan 430072, P. R. China
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9
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Tsigelny IF, Kouznetsova VL, Lian N, Kesari S. Molecular mechanisms of OLIG2 transcription factor in brain cancer. Oncotarget 2016; 7:53074-53101. [PMID: 27447975 PMCID: PMC5288170 DOI: 10.18632/oncotarget.10628] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2016] [Accepted: 06/03/2016] [Indexed: 12/13/2022] Open
Abstract
Oligodendrocyte lineage transcription factor 2 (OLIG2) plays a pivotal role in glioma development. Here we conducted a comprehensive study of the critical gene regulatory networks involving OLIG2. These include the networks responsible for OLIG2 expression, its translocation to nucleus, cell cycle, epigenetic regulation, and Rho-pathway interactions. We described positive feedback loops including OLIG2: loops of epigenetic regulation and loops involving receptor tyrosine kinases. These loops may be responsible for the prolonged oncogenic activity of OLIG2. The proposed schemes for epigenetic regulation of the gene networks involving OLIG2 are confirmed by patient survival (Kaplan-Meier) curves based on the cancer genome atlas (TCGA) datasets. Finally, we elucidate the Coherent-Gene Modules (CGMs) networks-framework of OLIG2 involvement in cancer. We showed that genes interacting with OLIG2 formed eight CGMs having a set of intermodular connections. We showed also that among the genes involved in these modules the most connected hub is EGFR, then, on lower level, HSP90 and CALM1, followed by three lower levels including epigenetic genes KDM1A and NCOR1. The genes on the six upper levels of the hierarchy are involved in interconnections of all eight CGMs and organize functionally defined gene-signaling subnetworks having specific functions. For example, CGM1 is involved in epigenetic control. CGM2 is significantly related to cell proliferation and differentiation. CGM3 includes a number of interconnected helix-loop-helix transcription factors (bHLH) including OLIG2. Many of these TFs are partially controlled by OLIG2. The CGM4 is involved in PDGF-related: angiogenesis, tumor cell proliferation and differentiation. These analyses provide testable hypotheses and approaches to inhibit OLIG2 pathway and relevant feed-forward and feedback loops to be interrogated. This broad approach can be applied to other TFs.
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Affiliation(s)
- Igor F. Tsigelny
- Department of Neurosciences, University of California San Diego, La Jolla, 92093-0752, CA, USA
- San Diego Supercomputer Center, University of California San Diego, La Jolla, 92093-0505, CA, USA
- Moores Cancer Center, University of California San Diego, La Jolla, 92093, CA, USA
| | - Valentina L. Kouznetsova
- San Diego Supercomputer Center, University of California San Diego, La Jolla, 92093-0505, CA, USA
- Moores Cancer Center, University of California San Diego, La Jolla, 92093, CA, USA
| | - Nathan Lian
- REHS, San Diego Supercomputer Center, University of California San Diego, La Jolla, 92093-0505, CA, USA
| | - Santosh Kesari
- John Wayne Cancer Institute at Providence Saint John's Health Center, Santa Monica, 90404, CA, USA
- Pacific Neuroscience Institute at Providence Saint John's Health Center, Santa Monica, 90404, CA, USA
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10
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Zhao S, Sedwick D, Wang Z. Genetic alterations of protein tyrosine phosphatases in human cancers. Oncogene 2014; 34:3885-94. [PMID: 25263441 PMCID: PMC4377308 DOI: 10.1038/onc.2014.326] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2014] [Revised: 08/20/2014] [Accepted: 08/21/2014] [Indexed: 12/12/2022]
Abstract
Protein tyrosine phosphatases (PTPs) are enzymes that remove phosphate from tyrosine residues in proteins. Recent whole-exome sequencing of human cancer genomes reveals that many PTPs are frequently mutated in a variety of cancers. Among these mutated PTPs, protein tyrosine phosphatase T (PTPRT) appears to be the most frequently mutated PTP in human cancers. Beside PTPN11 which functions as an oncogene in leukemia, genetic and functional studies indicate that most of mutant PTPs are tumor suppressor genes. Identification of the substrates and corresponding kinases of the mutant PTPs may provide novel therapeutic targets for cancers harboring these mutant PTPs.
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Affiliation(s)
- S Zhao
- 1] Division of Gastroenterology and Hepatology and Shanghai Institution of Digestive Disease, Shanghai Jiao-Tong University School of Medicine Renji Hospital, Shanghai, China [2] Department of Genetics and Genome Sciences, Case Western Reserve University, Cleveland, OH, USA [3] Case Comprehensive Cancer Center, Case Western Reserve University, Cleveland, OH, USA
| | - D Sedwick
- 1] Case Comprehensive Cancer Center, Case Western Reserve University, Cleveland, OH, USA [2] Department of Medicine, Case Western Reserve University, Cleveland, OH, USA
| | - Z Wang
- 1] Department of Genetics and Genome Sciences, Case Western Reserve University, Cleveland, OH, USA [2] Case Comprehensive Cancer Center, Case Western Reserve University, Cleveland, OH, USA
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11
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Jeon M, Zinn K. R3 receptor tyrosine phosphatases: conserved regulators of receptor tyrosine kinase signaling and tubular organ development. Semin Cell Dev Biol 2014; 37:119-26. [PMID: 25242281 DOI: 10.1016/j.semcdb.2014.09.005] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2014] [Accepted: 09/04/2014] [Indexed: 12/25/2022]
Abstract
R3 receptor tyrosine phosphatases (RPTPs) are characterized by extracellular domains composed solely of long chains of fibronectin type III repeats, and by the presence of a single phosphatase domain. There are five proteins in mammals with this structure, two in Drosophila and one in Caenorhabditis elegans. R3 RPTPs are selective regulators of receptor tyrosine kinase (RTK) signaling, and a number of different RTKs have been shown to be direct targets for their phosphatase activities. Genetic studies in both invertebrate model systems and in mammals have shown that R3 RPTPs are essential for tubular organ development. They also have important functions during nervous system development. R3 RPTPs are likely to be tumor suppressors in a number of types of cancer.
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Affiliation(s)
- Mili Jeon
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA 91125, United States; Department of Molecular and Cellular Physiology and Structural Biology, Howard Hughes Medical Institute, Stanford School of Medicine, Palo Alto, CA 94305, United States
| | - Kai Zinn
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA 91125, United States.
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12
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Spring K, Lapointe L, Caron C, Langlois S, Royal I. Phosphorylation of DEP-1/PTPRJ on threonine 1318 regulates Src activation and endothelial cell permeability induced by vascular endothelial growth factor. Cell Signal 2014; 26:1283-93. [DOI: 10.1016/j.cellsig.2014.02.008] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2014] [Accepted: 02/18/2014] [Indexed: 12/23/2022]
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13
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Krüger J, Trappiel M, Dagnell M, Stawowy P, Meyborg H, Böhm C, Bhanot S, Ostman A, Kintscher U, Kappert K. Targeting density-enhanced phosphatase-1 (DEP-1) with antisense oligonucleotides improves the metabolic phenotype in high-fat diet-fed mice. Cell Commun Signal 2013; 11:49. [PMID: 23889985 PMCID: PMC3734182 DOI: 10.1186/1478-811x-11-49] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2013] [Accepted: 07/08/2013] [Indexed: 01/27/2023] Open
Abstract
Background Insulin signaling is tightly controlled by tyrosine dephosphorylation of the insulin receptor through protein-tyrosine-phosphatases (PTPs). DEP-1 is a PTP dephosphorylating tyrosine residues in a variety of receptor tyrosine kinases. Here, we analyzed whether DEP-1 activity is differentially regulated in liver, skeletal muscle and adipose tissue under high-fat diet (HFD), examined the role of DEP-1 in insulin resistance in vivo, and its function in insulin signaling. Results Mice were fed an HFD for 10 weeks to induce obesity-associated insulin resistance. Thereafter, HFD mice were subjected to systemic administration of specific antisense oligonucleotides (ASOs), highly accumulating in hepatic tissue, against DEP-1 or control ASOs. Targeting DEP-1 led to improvement of insulin sensitivity, reduced basal glucose level, and significant reduction of body weight. This was accompanied by lower insulin and leptin serum levels. Suppression of DEP-1 in vivo also induced hyperphosphorylation in the insulin signaling cascade of the liver. Moreover, DEP-1 physically associated with the insulin receptor in situ, and recombinant DEP-1 dephosphorylated the insulin receptor in vitro. Conclusions These results indicate that DEP-1 acts as an endogenous antagonist of the insulin receptor, and downregulation of DEP-1 results in an improvement of insulin sensitivity. DEP-1 may therefore represent a novel target for attenuation of metabolic diseases.
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Ortuso F, Paduano F, Carotenuto A, Gomez-Monterrey I, Bilotta A, Gaudio E, Sala M, Artese A, Vernieri E, Dattilo V, Iuliano R, Brancaccio D, Bertamino A, Musella S, Alcaro S, Grieco P, Perrotti N, Croce CM, Novellino E, Fusco A, Campiglia P, Trapasso F. Discovery of PTPRJ agonist peptides that effectively inhibit in vitro cancer cell proliferation and tube formation. ACS Chem Biol 2013; 8:1497-506. [PMID: 23627474 DOI: 10.1021/cb3007192] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
PTPRJ is a receptor protein tyrosine phosphatase involved in both physiological and oncogenic pathways. We previously reported that its expression is strongly reduced in the majority of explored cancer cell lines and tumor samples; moreover, its restoration blocks in vitro cancer cell proliferation and in vivo tumor formation. By means of a phage display library screening, we recently identified two peptides able to bind and activate PTPRJ, resulting in cell growth inhibition and apoptosis of both cancer and endothelial cells. Here, on a previously discovered PTPRJ agonist peptide, PTPRJ-pep19, we synthesized and assayed a panel of nonapeptide analogues with the aim to identify specific amino acid residues responsible for peptide activity. These second-generation nonapeptides were tested on both cancer and primary endothelial cells (HeLa and HUVEC, respectively); interestingly, one of them (PTPRJ-19.4) was able to both dramatically reduce cell proliferation and effectively trigger apoptosis of both HeLa and HUVECs compared to its first-generation counterpart. Moreover, PTPRJ-pep19.4 significantly inhibited in vitro tube formation on Matrigel. Intriguingly, while ERK1/2 phosphorylation and cell proliferation were both inhibited by PTPRJ-pep19.4 in breast cancer cells (MCF-7 and SKBr3), no effects were observed on primary normal human mammary endothelial cells (HMEC). We further characterized these peptides by molecular modeling and NMR experiments reporting, for the most active peptide, the possibility of self-aggregation states and highlighting new hints of structure-activity relationship. Thus, our results indicate that this nonapeptide might represent a great potential lead for the development of novel targeted anticancer drugs.
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Affiliation(s)
| | | | - Alfonso Carotenuto
- Dipartimento
di Farmacia, Università degli Studi di Napoli “Federico II”, 80131 Napoli, Italy
| | - Isabel Gomez-Monterrey
- Dipartimento
di Farmacia, Università degli Studi di Napoli “Federico II”, 80131 Napoli, Italy
| | | | - Eugenio Gaudio
- Department of Molecular Virology,
Immunology and Medical Genetics and Comprehensive Cancer Center, The Ohio State University, Columbus, Ohio 43210, United
States
| | - Marina Sala
- Dipartimento
di Farmacia, Università degli Studi di Napoli “Federico II”, 80131 Napoli, Italy
| | | | | | | | | | - Diego Brancaccio
- Dipartimento
di Farmacia, Università degli Studi di Napoli “Federico II”, 80131 Napoli, Italy
| | - Alessia Bertamino
- Dipartimento di
Farmacia, Università di Salerno,
84084 Fisciano, Italy
| | - Simona Musella
- Dipartimento di
Farmacia, Università di Salerno,
84084 Fisciano, Italy
| | | | - Paolo Grieco
- Dipartimento
di Farmacia, Università degli Studi di Napoli “Federico II”, 80131 Napoli, Italy
| | | | - Carlo M. Croce
- Department of Molecular Virology,
Immunology and Medical Genetics and Comprehensive Cancer Center, The Ohio State University, Columbus, Ohio 43210, United
States
| | - Ettore Novellino
- Dipartimento
di Farmacia, Università degli Studi di Napoli “Federico II”, 80131 Napoli, Italy
| | - Alfredo Fusco
- Dipartimento
di Biologia e Patologia Cellulare e Molecolare c/o Istituto di Endocrinologia
ed Oncologia Sperimentale del CNR, Università degli Studi di Napoli “Federico II”, 80131
Napoli, Italy
| | - Pietro Campiglia
- Dipartimento di
Farmacia, Università di Salerno,
84084 Fisciano, Italy
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15
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Sakuraba J, Shintani T, Tani S, Noda M. Substrate specificity of R3 receptor-like protein-tyrosine phosphatase subfamily toward receptor protein-tyrosine kinases. J Biol Chem 2013; 288:23421-31. [PMID: 23814054 DOI: 10.1074/jbc.m113.458489] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
Receptor-like protein-tyrosine phosphatases (RPTPs) are involved in various aspects of cellular functions, such as proliferation, differentiation, survival, migration, and metabolism. A small number of RPTPs have been reported to regulate activities of some cellular proteins including receptor protein-tyrosine kinases (RPTKs). However, our understanding about the roles of individual RPTPs in the regulation of RPTKs is still limited. The R3 RPTP subfamily reportedly plays pivotal roles in the development of several tissues including the vascular and nervous systems. Here, we examined enzyme-substrate relationships between the four R3 RPTP subfamily members and 21 RPTK members selected from 14 RPTK subfamilies by using a mammalian two-hybrid system with substrate-trapping RPTP mutants. Among the 84 RPTP-RPTK combinations conceivable, we detected 30 positive interactions: 25 of the enzyme-substrate relationships were novel. We randomly chose several RPTKs assumed to be substrates for R3 RPTPs, and validated the results of this screen by in vitro dephosphorylation assays, and by cell-based assays involving overexpression and knock-down experiments. Because their functional relationships were verified without exception, it is probable that the RPTKs identified as potential substrates are actually physiological substrates for the R3 RPTPs. Interestingly, some RPTKs were recognized as substrates by all R3 members, but others were recognized by only one or a few members. The enzyme-substrate relationships identified in the present study will shed light on physiological roles of the R3 RPTP subfamily.
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Affiliation(s)
- Juichi Sakuraba
- Division of Molecular Neurobiology, National Institute for Basic Biology, Graduate University for Advanced Studies (SOKENDAI), Okazaki 444-8787, Japan
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16
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Böhmer SA, Weibrecht I, Söderberg O, Böhmer FD. Association of the protein-tyrosine phosphatase DEP-1 with its substrate FLT3 visualized by in situ proximity ligation assay. PLoS One 2013; 8:e62871. [PMID: 23650535 PMCID: PMC3641115 DOI: 10.1371/journal.pone.0062871] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2012] [Accepted: 03/26/2013] [Indexed: 01/01/2023] Open
Abstract
Protein-tyrosine phosphatases (PTPs) are important regulators of signal transduction processes. Essential for the functional characterization of PTPs is the identification of their physiological substrates, and an important step towards this goal is the demonstration of a physical interaction. The association of PTPs with their cellular substrates is, however, often transient and difficult to detect with unmodified proteins at endogenous levels. Density-enhanced phosphatase-1 (DEP-1/PTPRJ) is a regulator of hematopoietic cell functions, and a candidate tumor suppressor. However, association of DEP-1 with any of its proposed substrates at endogenous levels has not yet been shown. We have previously obtained functional and biochemical evidence for a direct interaction of DEP-1 with the hematopoietic receptor-tyrosine kinase Fms-like tyrosine kinase-3 (FLT3). In the current study we have used the method of in situ proximity ligation assay (in situ PLA) to validate this interaction at endogenous levels, and to further characterize it. In situ PLA readily detected association of endogenous DEP-1 and FLT3 in the human acute monocytic leukemia cell line THP-1, which was enhanced by FLT3 ligand (FL) stimulation in a time-dependent manner. Association peaked between 10 and 20 min of stimulation and returned to basal levels at 30 min. This time course was similar to the time course of FLT3 autophosphorylation. FLT3 kinase inhibition and DEP-1 oxidation abrogated association. Consistent with a functional role of DEP-1-FLT3 interaction, stable knockdown of DEP-1 in THP-1 cells enhanced FL-induced ERK1/2 activation. These findings support that FLT3 is a bona fide substrate of DEP-1 and that interaction occurs mainly via an enzyme-substrate complex formation triggered by FLT3 ligand stimulation.
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Affiliation(s)
- Sylvia-Annette Böhmer
- Institute of Molecular Cell Biology, Center for Molecular Biomedicine, Jena University Hospital, Jena, Germany
| | - Irene Weibrecht
- Department of Immunology, Genetics and Pathology, Science for Life Laboratory, Rudbeck Laboratory, Uppsala University, Uppsala, Sweden
| | - Ola Söderberg
- Department of Immunology, Genetics and Pathology, Science for Life Laboratory, Rudbeck Laboratory, Uppsala University, Uppsala, Sweden
| | - Frank-D. Böhmer
- Institute of Molecular Cell Biology, Center for Molecular Biomedicine, Jena University Hospital, Jena, Germany
- * E-mail:
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17
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Agrawal N, Jiao Y, Sausen M, Leary R, Bettegowda C, Roberts NJ, Bhan S, Ho AS, Khan Z, Bishop J, Westra WH, Wood LD, Hruban RH, Tufano RP, Robinson B, Dralle H, Toledo SPA, Toledo RA, Morris LGT, Ghossein RA, Fagin JA, Chan TA, Velculescu VE, Vogelstein B, Kinzler KW, Papadopoulos N, Nelkin BD, Ball DW. Exomic sequencing of medullary thyroid cancer reveals dominant and mutually exclusive oncogenic mutations in RET and RAS. J Clin Endocrinol Metab 2013; 98:E364-9. [PMID: 23264394 PMCID: PMC3565108 DOI: 10.1210/jc.2012-2703] [Citation(s) in RCA: 162] [Impact Index Per Article: 14.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
CONTEXT Medullary thyroid cancer (MTC) is a rare thyroid cancer that can occur sporadically or as part of a hereditary syndrome. OBJECTIVE To explore the genetic origin of MTC, we sequenced the protein coding exons of approximately 21,000 genes in 17 sporadic MTCs. PATIENTS AND DESIGN We sequenced the exomes of 17 sporadic MTCs and validated the frequency of all recurrently mutated genes and other genes of interest in an independent cohort of 40 MTCs comprised of both sporadic and hereditary MTC. RESULTS We discovered 305 high-confidence mutations in the 17 sporadic MTCs in the discovery phase, or approximately 17.9 somatic mutations per tumor. Mutations in RET, HRAS, and KRAS genes were identified as the principal driver mutations in MTC. All of the other additional somatic mutations, including mutations in spliceosome and DNA repair pathways, were not recurrent in additional tumors. Tumors without RET, HRAS, or KRAS mutations appeared to have significantly fewer mutations overall in protein coding exons. CONCLUSIONS Approximately 90% of MTCs had mutually exclusive mutations in RET, HRAS, and KRAS, suggesting that RET and RAS are the predominant driver pathways in MTC. Relatively few mutations overall and no commonly recurrent driver mutations other than RET, HRAS, and KRAS were seen in the MTC exome.
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Affiliation(s)
- Nishant Agrawal
- Ludwig Center for Cancer Genetics and Howard Hughes Medical Institutions, Baltimore, Maryland 21287, USA.
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18
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Paduano F, Ortuso F, Campiglia P, Raso C, Iaccino E, Gaspari M, Gaudio E, Mangone G, Carotenuto A, Bilotta A, Narciso D, Palmieri C, Agosti V, Artese A, Gomez-Monterrey I, Sala M, Cuda G, Iuliano R, Perrotti N, Scala G, Viglietto G, Alcaro S, Croce CM, Novellino E, Fusco A, Trapasso F. Isolation and functional characterization of peptide agonists of PTPRJ, a tyrosine phosphatase receptor endowed with tumor suppressor activity. ACS Chem Biol 2012; 7:1666-76. [PMID: 22759068 DOI: 10.1021/cb300281t] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
PTPRJ is a receptor-type protein tyrosine phosphatase whose expression is strongly reduced in the majority of investigated cancer cell lines and tumor specimens. PTPRJ negatively interferes with mitogenic signals originating from several oncogenic receptor tyrosine kinases, including HGFR, PDGFR, RET, and VEGFR-2. Here we report the isolation and characterization of peptides from a random peptide phage display library that bind and activate PTPRJ. These agonist peptides, which are able to both circularize and form dimers in acqueous solution, were assayed for their biochemical and biological activity on both human cancer cells and primary endothelial cells (HeLa and HUVEC, respectively). Our results demonstrate that binding of PTPRJ-interacting peptides to cell cultures dramatically reduces the extent of both MAPK phosphorylation and total phosphotyrosine levels; conversely, they induce a significant increase of the cell cycle inhibitor p27(Kip1). Moreover, PTPRJ agonist peptides both reduce proliferation and trigger apoptosis of treated cells. Our data indicate that peptide agonists of PTPRJ positively modulate the PTPRJ activity and may lead to novel targeted anticancer therapies.
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Affiliation(s)
- Francesco Paduano
- Dipartimento di Medicina Sperimentale
e Clinica, Università “Magna Græcia” di Catanzaro, Campus “S. Venuta”, 88100
Catanzaro, Italy
| | - Francesco Ortuso
- Laboratorio
di Chimica Farmaceutica
Computazionale, Dipartimento di Scienze Farmacobiologiche, Università “Magna Græcia” di Catanzaro, Campus “S. Venuta”, 88100 Catanzaro, Italy
| | - Pietro Campiglia
- Dipartimento di Scienze Farmaceutiche
e Biomediche, Sezione Chimico-Tecnologica, Università di Salerno, 84084 Fisciano (Salerno), Italy
| | - Cinzia Raso
- Dipartimento di Medicina Sperimentale
e Clinica, Università “Magna Græcia” di Catanzaro, Campus “S. Venuta”, 88100
Catanzaro, Italy
| | - Enrico Iaccino
- Dipartimento di Medicina Sperimentale
e Clinica, Università “Magna Græcia” di Catanzaro, Campus “S. Venuta”, 88100
Catanzaro, Italy
| | - Marco Gaspari
- Dipartimento di Medicina Sperimentale
e Clinica, Università “Magna Græcia” di Catanzaro, Campus “S. Venuta”, 88100
Catanzaro, Italy
| | - Eugenio Gaudio
- Dipartimento di Medicina Sperimentale
e Clinica, Università “Magna Græcia” di Catanzaro, Campus “S. Venuta”, 88100
Catanzaro, Italy
- Department of Molecular Virology,
Immunology and Medical Genetics and Comprehensive Cancer Center, The Ohio State University, Columbus, Ohio 43210, United
States
| | - Graziella Mangone
- Dipartimento di Medicina Sperimentale
e Clinica, Università “Magna Græcia” di Catanzaro, Campus “S. Venuta”, 88100
Catanzaro, Italy
| | - Alfonso Carotenuto
- Dipartimento di
Chimica Farmaceutica
e Tossicologica, Università degli Studi di Napoli “Federico II”, 80131 Naples, Italy
| | - Anna Bilotta
- Dipartimento di Medicina Sperimentale
e Clinica, Università “Magna Græcia” di Catanzaro, Campus “S. Venuta”, 88100
Catanzaro, Italy
| | - Domenico Narciso
- Dipartimento di Medicina Sperimentale
e Clinica, Università “Magna Græcia” di Catanzaro, Campus “S. Venuta”, 88100
Catanzaro, Italy
| | - Camillo Palmieri
- Dipartimento di Medicina Sperimentale
e Clinica, Università “Magna Græcia” di Catanzaro, Campus “S. Venuta”, 88100
Catanzaro, Italy
| | - Valter Agosti
- Dipartimento di Medicina Sperimentale
e Clinica, Università “Magna Græcia” di Catanzaro, Campus “S. Venuta”, 88100
Catanzaro, Italy
| | - Anna Artese
- Laboratorio
di Chimica Farmaceutica
Computazionale, Dipartimento di Scienze Farmacobiologiche, Università “Magna Græcia” di Catanzaro, Campus “S. Venuta”, 88100 Catanzaro, Italy
| | - Isabel Gomez-Monterrey
- Dipartimento di
Chimica Farmaceutica
e Tossicologica, Università degli Studi di Napoli “Federico II”, 80131 Naples, Italy
| | - Marina Sala
- Dipartimento di Scienze Farmaceutiche
e Biomediche, Sezione Chimico-Tecnologica, Università di Salerno, 84084 Fisciano (Salerno), Italy
| | - Giovanni Cuda
- Dipartimento di Medicina Sperimentale
e Clinica, Università “Magna Græcia” di Catanzaro, Campus “S. Venuta”, 88100
Catanzaro, Italy
| | - Rodolfo Iuliano
- Dipartimento di Medicina Sperimentale
e Clinica, Università “Magna Græcia” di Catanzaro, Campus “S. Venuta”, 88100
Catanzaro, Italy
| | - Nicola Perrotti
- Dipartimento di Medicina Sperimentale
e Clinica, Università “Magna Græcia” di Catanzaro, Campus “S. Venuta”, 88100
Catanzaro, Italy
| | - Giuseppe Scala
- Dipartimento di Medicina Sperimentale
e Clinica, Università “Magna Græcia” di Catanzaro, Campus “S. Venuta”, 88100
Catanzaro, Italy
| | - Giuseppe Viglietto
- Dipartimento di Medicina Sperimentale
e Clinica, Università “Magna Græcia” di Catanzaro, Campus “S. Venuta”, 88100
Catanzaro, Italy
| | - Stefano Alcaro
- Laboratorio
di Chimica Farmaceutica
Computazionale, Dipartimento di Scienze Farmacobiologiche, Università “Magna Græcia” di Catanzaro, Campus “S. Venuta”, 88100 Catanzaro, Italy
| | - Carlo M. Croce
- Department of Molecular Virology,
Immunology and Medical Genetics and Comprehensive Cancer Center, The Ohio State University, Columbus, Ohio 43210, United
States
| | - Ettore Novellino
- Dipartimento di
Chimica Farmaceutica
e Tossicologica, Università degli Studi di Napoli “Federico II”, 80131 Naples, Italy
| | - Alfredo Fusco
- Dipartimento di Biologia e Patologia
Cellulare e Molecolare c/o Istituto di Endocrinologia ed Oncologia
Sperimentale del CNR, Università degli Studi di Napoli “Federico II”, 80131 Naples, Italy
| | - Francesco Trapasso
- Dipartimento di Medicina Sperimentale
e Clinica, Università “Magna Græcia” di Catanzaro, Campus “S. Venuta”, 88100
Catanzaro, Italy
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19
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Receptor type protein tyrosine phosphatases (RPTPs) - roles in signal transduction and human disease. J Cell Commun Signal 2012; 6:125-38. [PMID: 22851429 DOI: 10.1007/s12079-012-0171-5] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2012] [Accepted: 07/12/2012] [Indexed: 01/06/2023] Open
Abstract
Protein tyrosine phosphorylation is a fundamental regulatory mechanism controlling cell proliferation, differentiation, communication, and adhesion. Disruption of this key regulatory mechanism contributes to a variety of human diseases including cancer, diabetes, and auto-immune diseases. Net protein tyrosine phosphorylation is determined by the dynamic balance of the activity of protein tyrosine kinases (PTKs) and protein tyrosine phosphatases (PTPs). Mammals express many distinct PTKs and PTPs. Both of these families can be sub-divided into non-receptor and receptor subtypes. Receptor protein tyrosine kinases (RPTKs) comprise a large family of cell surface proteins that initiate intracellular tyrosine phosphorylation-dependent signal transduction in response to binding of extracellular ligands, such as growth factors and cytokines. Receptor-type protein tyrosine phosphatases (RPTPs) are enzymatic and functional counterparts of RPTKs. RPTPs are a family of integral cell surface proteins that possess intracellular PTP activity, and extracellular domains that have sequence homology to cell adhesion molecules. In comparison to extensively studied RPTKs, much less is known about RPTPs, especially regarding their substrate specificities, regulatory mechanisms, biological functions, and their roles in human diseases. Based on the structure of their extracellular domains, the RPTP family can be grouped into eight sub-families. This article will review one representative member from each RPTP sub-family.
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20
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Labbé DP, Hardy S, Tremblay ML. Protein tyrosine phosphatases in cancer: friends and foes! PROGRESS IN MOLECULAR BIOLOGY AND TRANSLATIONAL SCIENCE 2012; 106:253-306. [PMID: 22340721 DOI: 10.1016/b978-0-12-396456-4.00009-2] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Tyrosine phosphorylation of proteins serves as an exquisite switch in controlling several key oncogenic signaling pathways involved in cell proliferation, apoptosis, migration, and invasion. Since protein tyrosine phosphatases (PTPs) counteract protein kinases by removing phosphate moieties on target proteins, one may intuitively think that PTPs would act as tumor suppressors. Indeed, one of the most described PTPs, namely, the phosphatase and tensin homolog (PTEN), is a tumor suppressor. However, a growing body of evidence suggests that PTPs can also function as potent oncoproteins. In this chapter, we provide a broad historical overview of the PTPs, their mechanism of action, and posttranslational modifications. Then, we focus on the dual properties of classical PTPs (receptor and nonreceptor) and dual-specificity phosphatases in cancer and summarize the current knowledge of the signaling pathways regulated by key PTPs in human cancer. In conclusion, we present our perspective on the potential of these PTPs to serve as therapeutic targets in cancer.
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Affiliation(s)
- David P Labbé
- Goodman Cancer Research Centre, McGill University, Montréal, Québec, Canada
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21
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Paduano F, Dattilo V, Narciso D, Bilotta A, Gaudio E, Menniti M, Agosti V, Palmieri C, Perrotti N, Fusco A, Trapasso F, Iuliano R. Protein tyrosine phosphatase PTPRJ is negatively regulated by microRNA-328. FEBS J 2012; 280:401-12. [PMID: 22564856 DOI: 10.1111/j.1742-4658.2012.08624.x] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Expression of PTPRJ, which is a ubiquitous receptor-type protein tyrosine phosphatase, is significantly reduced in a vast majority of human epithelial cancers and cancer cell lines (i.e. colon, lung, thyroid, mammary and pancreatic tumours). A possible role for microRNAs (miRNAs) in the negative regulation of PTPRJ expression has never been investigated. In this study, we show that overexpression of microRNA-328 (miR-328) decreases PTPRJ expression in HeLa and SKBr3 cells. Further investigations demonstrate that miR-328 acts directly on the 3'UTR of PTPRJ, resulting in reduced mRNA levels. Luciferase assay and site-specific mutagenesis were used to identify a functional miRNA response element in the 3'UTR of PTPRJ. Expression of miR-328 significantly enhances cell proliferation in HeLa and SKBr3 cells, similar to the effects of downregulation of PTPRJ with small interfering RNA. Additionally, in HeLa cells, the proliferative effect of miR-328 was not observed when PTPRJ was silenced with small interfering RNA; conversely, restoration of PTPRJ expression in miR-328-overexpressing cells abolished the proliferative activity of miR-328. In conclusion, we report the identification of miR-328 as an important player in the regulation of PTPRJ expression, and we propose that the interaction of miR-328 with PTPRJ is responsible for miR-328-dependent increase of epithelial cell proliferation.
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Affiliation(s)
- Francesco Paduano
- Dipartimento di Medicina Sperimentale e Clinica, Università Magna Graecia, Catanzaro, Italy.
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22
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Menicali E, Moretti S, Voce P, Romagnoli S, Avenia N, Puxeddu E. Intracellular signal transduction and modification of the tumor microenvironment induced by RET/PTCs in papillary thyroid carcinoma. Front Endocrinol (Lausanne) 2012; 3:67. [PMID: 22661970 PMCID: PMC3357465 DOI: 10.3389/fendo.2012.00067] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/05/2012] [Accepted: 04/30/2012] [Indexed: 01/06/2023] Open
Abstract
RET gene rearrangements (RET/PTCs) represent together with BRAF point mutations the two major groups of mutations involved in papillary thyroid carcinoma (PTC) initiation and progression. In this review, we will examine the mechanisms involved in RET/PTC-induced thyroid cell transformation. In detail, we will summarize the data on the molecular mechanisms involved in RET/PTC formation and in its function as a dominant oncogene, on the activated signal transduction pathways and on the induced gene expression modifications. Moreover, we will report on the effects of RET/PTCs on the tumor microenvironment. Finally, a short review of the literature on RET/PTC prognostic significance will be presented.
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Affiliation(s)
- Elisa Menicali
- Dipartimento di Medicina, University of PerugiaPerugia, Italy
- Centro di Proteomica e Genomica della Tiroide, University of PerugiaPerugia and Terni, Italy
| | - Sonia Moretti
- Dipartimento di Medicina, University of PerugiaPerugia, Italy
- Centro di Proteomica e Genomica della Tiroide, University of PerugiaPerugia and Terni, Italy
| | - Pasquale Voce
- Dipartimento di Medicina, University of PerugiaPerugia, Italy
- Centro di Proteomica e Genomica della Tiroide, University of PerugiaPerugia and Terni, Italy
| | | | - Nicola Avenia
- Centro di Proteomica e Genomica della Tiroide, University of PerugiaPerugia and Terni, Italy
- Dipartimento di Chirurgia, University of PerugiaPerugia, Italy
| | - Efisio Puxeddu
- Dipartimento di Medicina, University of PerugiaPerugia, Italy
- Centro di Proteomica e Genomica della Tiroide, University of PerugiaPerugia and Terni, Italy
- *Correspondence: Efisio Puxeddu, Dipartimento di Medicina, Sezione MIENDO, Via Enrico dal Pozzo – Padiglione X, 06126 Perugia, Italy. e-mail:
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23
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Landa I, Robledo M. Association studies in thyroid cancer susceptibility: are we on the right track? J Mol Endocrinol 2011; 47:R43-58. [PMID: 21610006 DOI: 10.1530/jme-11-0005] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
It is widely accepted that thyroid cancer is strongly determined by the individual genetic background. In this regard, it is expected that sporadic thyroid cancer is the result of multiple low- to moderate-penetrance genes interacting with each other and with the environment, thus modulating individual susceptibility. In the last years, an important number of association studies on thyroid cancer have been published, trying to determine this genetic contribution. The aim of this review is to provide a comprehensive and critical evaluation of the associations reported so far in thyroid cancer susceptibility in case-control studies performed in both non-medullary (papillary and follicular) and medullary thyroid cancers, including their potential strengths and pitfalls. We summarize the genetic variants reported to date, and stress the importance of validating the results in independent series and assessing the functional role of the associated loci.
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Affiliation(s)
- Iñigo Landa
- Hereditary Endocrine Cancer Group, Spanish National Cancer Research Centre (CNIO), Melchor Fernández Almagro 3, 28029 Madrid, Spain Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER), Madrid, Spain
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24
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Petermann A, Haase D, Wetzel A, Balavenkatraman KK, Tenev T, Gührs KH, Friedrich S, Nakamura M, Mawrin C, Böhmer FD. Loss of the protein-tyrosine phosphatase DEP-1/PTPRJ drives meningioma cell motility. Brain Pathol 2010; 21:405-18. [PMID: 21091576 DOI: 10.1111/j.1750-3639.2010.00464.x] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
DEP-1/PTPRJ is a transmembrane protein-tyrosine phosphatase which has been proposed as a suppressor of epithelial tumors. We have found loss of heterozygosity (LOH) of the PTPRJ gene and loss of DEP-1 protein expression in a subset of human meningiomas. RNAi-mediated suppression of DEP-1 in DEP-1 positive meningioma cell lines caused enhanced motility and colony formation in semi-solid media. Cells devoid of DEP-1 exhibited enhanced signaling of endogenous platelet-derived growth factor (PDGF) receptors, and reduced paxillin phosphorylation upon seeding. Moreover, DEP-1 loss caused diminished adhesion to different matrices, and impaired cell spreading. DEP-1-deficient meningioma cells exhibited invasive growth in an orthotopic xenotransplantation model in nude mice, indicating that elevated motility translates into a biological phenotype in vivo. We propose that negative regulation of PDGF receptor signaling and positive regulation of adhesion signaling by DEP-1 cooperate in inhibition of meningioma cell motility, and possibly tumor invasiveness. These phenotypes of DEP-1 loss reveal functions of DEP-1 in adherent cells, and may be more generally relevant for tumorigenesis.
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Affiliation(s)
- Astrid Petermann
- Institute of Molecular Cell Biology, Center for Molecular Biomedicine, Jena, Germany
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25
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Iuliano R, Palmieri D, He H, Iervolino A, Borbone E, Pallante P, Cianflone A, Nagy R, Alder H, Calin GA, Trapasso F, Giordano C, Croce CM, de la Chapelle A, Fusco A. Role of PTPRJ genotype in papillary thyroid carcinoma risk. Endocr Relat Cancer 2010; 17:1001-6. [PMID: 20823296 PMCID: PMC3915780 DOI: 10.1677/erc-10-0143] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
The strong genetic predisposition to papillary thyroid carcinoma (PTC) might be due to a combination of low-penetrance susceptibility variants. Thus, the research into gene variants involved in the increase of susceptibility to PTC is a relevant field of investigation. The gene coding for the receptor-type tyrosine phosphatase PTPRJ has been proposed as a cancer susceptibility gene, and its role as a tumor suppressor gene is well established in thyroid carcinogenesis. In this study, we want to ascertain the role of PTPRJ genotype in the risk for PTC. We performed a case-control study in which we determined the PTPRJ genotype for the non-synonymous Gln276Pro and Asp872Glu polymorphisms by PCR amplification and sequencing. We calculated allele and genotype frequencies for the considered polymorphisms of PTPRJ in a total sample of 299 cases (PTC patients) and 339 controls (healthy subjects) selected from Caucasian populations. We observed a significantly higher frequency of homozygotes for the Asp872 allele in the group of PTC patients than in the control group (odds ratio=1.61, 95% confidence interval 1.15-2.25, P=0.0053). We observed a non-significant increased frequency of homozygotes for Gln276Pro polymorphism in PTC cases in two distinct Caucasian populations. Therefore, the results reported here show that the homozygous genotype for Asp872 of PTPRJ is associated with an increased risk to develop PTC.
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Affiliation(s)
- Rodolfo Iuliano
- Dipartimento di Medicina Sperimentale e Clinica, Facoltà di Medicina e Chirurgia, Università degli Studi “Magna Græcia” di Catanzaro, viale Europa, 88100 Catanzaro, Italy
- Corresponding Authors Rodolfo Iuliano, Dipartimento di Medicina Sperimentale e Clinica, Facoltà di Medicina e Chirurgia, Università di Catanzaro, Campus “Salvatore Venuta” Viale Europa, località Germaneto, 88100 Catanzaro, Italy. Tel. +39-0961-3695182 Fax: +39-0961-3694090 Istituto di Endocrinologia ed Oncologia Sperimentale del CNR c/o Dipartimento di Biologia e Patologia Cellulare e Molecolare c/o, Facoltà di Medicina e Chirurgia, Università degli Studi di Napoli “Federico II”,80131 Napoli, Italy. Tel. +39-081-3737857 Fax: +39-081-3737808
| | - Dario Palmieri
- Istituto di Endocrinologia ed Oncologia Sperimentale del CNR c/o Dipartimento di Biologia e Patologia Cellulare e Molecolare c/o, Facoltà di Medicina e Chirurgia, Università degli Studi di Napoli “Federico II”,80131 Napoli, Italy
- NOGEC (Naples Oncogenomic Center) – CEINGE, Biotecnologie Avanzate, via Comunale Margherita, 482, 80145 Napoli, Italy
| | - Huiling He
- Division of Human Cancer Genetics, Comprehensive Cancer Center, Ohio State University, 460 West 12th Avenue, Columbus, Ohio, 43210, USA
| | - Angela Iervolino
- Istituto di Endocrinologia ed Oncologia Sperimentale del CNR c/o Dipartimento di Biologia e Patologia Cellulare e Molecolare c/o, Facoltà di Medicina e Chirurgia, Università degli Studi di Napoli “Federico II”,80131 Napoli, Italy
- NOGEC (Naples Oncogenomic Center) – CEINGE, Biotecnologie Avanzate, via Comunale Margherita, 482, 80145 Napoli, Italy
| | - Eleonora Borbone
- Istituto di Endocrinologia ed Oncologia Sperimentale del CNR c/o Dipartimento di Biologia e Patologia Cellulare e Molecolare c/o, Facoltà di Medicina e Chirurgia, Università degli Studi di Napoli “Federico II”,80131 Napoli, Italy
- NOGEC (Naples Oncogenomic Center) – CEINGE, Biotecnologie Avanzate, via Comunale Margherita, 482, 80145 Napoli, Italy
| | - Pierlorenzo Pallante
- Istituto di Endocrinologia ed Oncologia Sperimentale del CNR c/o Dipartimento di Biologia e Patologia Cellulare e Molecolare c/o, Facoltà di Medicina e Chirurgia, Università degli Studi di Napoli “Federico II”,80131 Napoli, Italy
- NOGEC (Naples Oncogenomic Center) – CEINGE, Biotecnologie Avanzate, via Comunale Margherita, 482, 80145 Napoli, Italy
| | - Alessandra Cianflone
- Istituto di Endocrinologia ed Oncologia Sperimentale del CNR c/o Dipartimento di Biologia e Patologia Cellulare e Molecolare c/o, Facoltà di Medicina e Chirurgia, Università degli Studi di Napoli “Federico II”,80131 Napoli, Italy
| | - Rebecca Nagy
- Division of Human Cancer Genetics, Comprehensive Cancer Center, Ohio State University, 460 West 12th Avenue, Columbus, Ohio, 43210, USA
| | - Hansjuerg Alder
- Division of Human Cancer Genetics, Comprehensive Cancer Center, Ohio State University, 460 West 12th Avenue, Columbus, Ohio, 43210, USA
| | - George A. Calin
- Division of Human Cancer Genetics, Comprehensive Cancer Center, Ohio State University, 460 West 12th Avenue, Columbus, Ohio, 43210, USA
| | - Francesco Trapasso
- Dipartimento di Medicina Sperimentale e Clinica, Facoltà di Medicina e Chirurgia, Università degli Studi “Magna Græcia” di Catanzaro, viale Europa, 88100 Catanzaro, Italy
| | - Carla Giordano
- Sezione di Endocrinologia, DOSAC (Dipartimento di Oncologia Sperimentale ed Applicazioni Cliniche), Università di Palermo, Piazza delle Cliniche 2, 90127, Palermo, Italy
| | - Carlo M. Croce
- Division of Human Cancer Genetics, Comprehensive Cancer Center, Ohio State University, 460 West 12th Avenue, Columbus, Ohio, 43210, USA
| | - Albert de la Chapelle
- Division of Human Cancer Genetics, Comprehensive Cancer Center, Ohio State University, 460 West 12th Avenue, Columbus, Ohio, 43210, USA
| | - Alfredo Fusco
- Istituto di Endocrinologia ed Oncologia Sperimentale del CNR c/o Dipartimento di Biologia e Patologia Cellulare e Molecolare c/o, Facoltà di Medicina e Chirurgia, Università degli Studi di Napoli “Federico II”,80131 Napoli, Italy
- NOGEC (Naples Oncogenomic Center) – CEINGE, Biotecnologie Avanzate, via Comunale Margherita, 482, 80145 Napoli, Italy
- Corresponding Authors Rodolfo Iuliano, Dipartimento di Medicina Sperimentale e Clinica, Facoltà di Medicina e Chirurgia, Università di Catanzaro, Campus “Salvatore Venuta” Viale Europa, località Germaneto, 88100 Catanzaro, Italy. Tel. +39-0961-3695182 Fax: +39-0961-3694090 Istituto di Endocrinologia ed Oncologia Sperimentale del CNR c/o Dipartimento di Biologia e Patologia Cellulare e Molecolare c/o, Facoltà di Medicina e Chirurgia, Università degli Studi di Napoli “Federico II”,80131 Napoli, Italy. Tel. +39-081-3737857 Fax: +39-081-3737808
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Tarcic G, Boguslavsky SK, Wakim J, Kiuchi T, Liu A, Reinitz F, Nathanson D, Takahashi T, Mischel PS, Ng T, Yarden Y. An unbiased screen identifies DEP-1 tumor suppressor as a phosphatase controlling EGFR endocytosis. Curr Biol 2010; 19:1788-98. [PMID: 19836242 DOI: 10.1016/j.cub.2009.09.048] [Citation(s) in RCA: 92] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2009] [Revised: 09/15/2009] [Accepted: 09/15/2009] [Indexed: 01/26/2023]
Abstract
BACKGROUND The epidermal growth factor (EGF) stimulates rapid tyrosine phosphorylation of the EGF receptor (EGFR). This event precedes signaling from both the plasma membrane and from endosomes, and it is essential for recruitment of a ubiquitin ligase, CBL, that sorts activated receptors to endosomes and degradation. Because hyperphosphorylation of EGFR is involved in oncogenic pathways, we performed an unbiased screen of small interfering RNA (siRNA) oligonucleotides targeting all human tyrosine phosphatases. RESULTS We report the identification of PTPRK and PTPRJ (density-enhanced phosphatase-1 [DEP-1]) as EGFR-targeting phosphatases. DEP-1 is a tumor suppressor that dephosphorylates and thereby stabilizes EGFR by hampering its ability to associate with the CBL-GRB2 ubiquitin ligase complex. DEP-1 silencing enhanced tyrosine phosphorylation of endosomal EGFRs and, accordingly, increased cell proliferation. In line with functional interactions, EGFR and DEP-1 form physical associations, and EGFR phosphorylates a substrate-trapping mutant of DEP-1. Interestingly, the interactions of DEP-1 and EGFR are followed by physical segregation: whereas EGFR undergoes endocytosis, DEP-1 remains confined to the cell surface. CONCLUSIONS EGFR and DEP-1 physically interact at the cell surface and maintain bidirectional enzyme-substrate interactions, which are relevant to their respective oncogenic and tumor-suppressive functions. These observations highlight the emerging roles of vesicular trafficking in malignant processes.
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Affiliation(s)
- Gabi Tarcic
- Department of Biological Regulation, The Weizmann Institute of Science, Rehovot 76100, Israel
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Borbone E, Berlingieri MT, De Bellis F, Nebbioso A, Chiappetta G, Mai A, Altucci L, Fusco A. Histone deacetylase inhibitors induce thyroid cancer-specific apoptosis through proteasome-dependent inhibition of TRAIL degradation. Oncogene 2009; 29:105-16. [DOI: 10.1038/onc.2009.306] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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28
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Sacco F, Tinti M, Palma A, Ferrari E, Nardozza AP, van Huijsduijnen RH, Takahashi T, Castagnoli L, Cesareni G. Tumor suppressor density-enhanced phosphatase-1 (DEP-1) inhibits the RAS pathway by direct dephosphorylation of ERK1/2 kinases. J Biol Chem 2009; 284:22048-22058. [PMID: 19494114 DOI: 10.1074/jbc.m109.002758] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
Density-enhanced phosphatase-1 (DEP-1) is a trans-membrane receptor protein-tyrosine phosphatase that plays a recognized prominent role as a tumor suppressor. However, the mechanistic details underlying its function are poorly understood because its primary physiological substrate(s) have not been firmly established. To shed light on the mechanisms underlying the anti-proliferative role of this phosphatase, we set out to identify new DEP-1 substrates by a novel approach based on screening of high density peptide arrays. The results of the array experiment were combined with a bioinformatics filter to identify eight potential DEP-1 targets among the proteins annotated in the MAPK pathway. In this study we show that one of these potential targets, the ERK1/2, is indeed a direct DEP-1 substrate in vivo. Pulldown and in vitro dephosphorylation assays confirmed our prediction and demonstrated an overall specificity of DEP-1 in targeting the phosphorylated tyrosine 204 of ERK1/2. After epidermal growth factor stimulation, the phosphorylation of the activation loop of ERK1/2 can be modulated by changing the concentration of DEP-1, without affecting the activity of the upstream kinase MEK. In addition, we show that DEP-1 contains a KIM-like motif to recruit ERK1/2 proteins by a docking mechanism mediated by the common docking domain in ERK1/2. ERK proteins that are mutated in the conserved docking domain become insensitive to DEP-1 de-phosphorylation. Overall this study provides novel insights into the anti-proliferative role of this phosphatase and proposes a new mechanism that may also be relevant for the regulation of density-dependent growth inhibition.
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Affiliation(s)
- Francesca Sacco
- Department of Biology, University of Rome Tor Vergata, Via della Ricerca Scientifica, 00133 Rome, Italy
| | - Michele Tinti
- Department of Biology, University of Rome Tor Vergata, Via della Ricerca Scientifica, 00133 Rome, Italy
| | - Anita Palma
- Department of Biology, University of Rome Tor Vergata, Via della Ricerca Scientifica, 00133 Rome, Italy
| | - Emanuela Ferrari
- Department of Biology, University of Rome Tor Vergata, Via della Ricerca Scientifica, 00133 Rome, Italy
| | - Aurelio P Nardozza
- Department of Biology, University of Rome Tor Vergata, Via della Ricerca Scientifica, 00133 Rome, Italy
| | | | - Takamune Takahashi
- Nephrology Division and Center for Vascular Biology, Vanderbilt University Medical Center, Nashville, Tennessee 37232
| | - Luisa Castagnoli
- Department of Biology, University of Rome Tor Vergata, Via della Ricerca Scientifica, 00133 Rome, Italy
| | - Gianni Cesareni
- Department of Biology, University of Rome Tor Vergata, Via della Ricerca Scientifica, 00133 Rome, Italy; Istituto di Ricovero e Cura a Carattere Scientifico Fondazione Santa Lucia, 00143 Rome, Italy
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29
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Iuliano R, Raso C, Quintiero A, Pera IL, Pichiorri F, Palumbo T, Palmieri D, Pattarozzi A, Florio T, Viglietto G, Trapasso F, Croce CM, Fusco A. The eighth fibronectin type III domain of protein tyrosine phosphatase receptor J influences the formation of protein complexes and cell localization. J Biochem 2009; 145:377-85. [PMID: 19122201 DOI: 10.1093/jb/mvn175] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
Regulation of receptor-type phosphatases can involve the formation of higher-order structures, but the exact role played in this process by protein domains is not well understood. In this study we show the formation of different higher-order structures of the receptor-type phosphatase PTPRJ, detected in HEK293A cells transfected with different PTPRJ expression constructs. In the plasma membrane PTPRJ forms dimers detectable by treatment with the cross-linking reagent BS(3) (bis[sulfosuccinimidyl]suberate). However, other PTPRJ complexes, dependent on the formation of disulfide bonds, are detected by treatment with the oxidant agent H(2)O(2) or by a mutation Asp872Cys, located in the eighth fibronectin type III domain of PTPRJ. A deletion in the eighth fibronectin domain of PTPRJ impairs its dimerization in the plasma membrane and increases the formation of PTPRJ complexes dependent on disulfide bonds that remain trapped in the cytoplasm. The deletion mutant maintains the catalytic activity but is unable to carry out inhibition of proliferation on HeLa cells, achieved by the wild type form, since it does not reach the plasma membrane. Therefore, the intact structure of the eighth fibronectin domain of PTPRJ is critical for its localization in plasma membrane and biological function.
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Affiliation(s)
- Rodolfo Iuliano
- Dipartimento di Medicina Sperimentale e Clinica, Facoltà di Medicina e Chirurgia, Università di Catanzaro, 88100 Catanzaro, Italy
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30
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Toland AE, Rozek LS, Presswala S, Rennert G, Gruber SB. PTPRJ haplotypes and colorectal cancer risk. Cancer Epidemiol Biomarkers Prev 2008; 17:2782-5. [PMID: 18843023 DOI: 10.1158/1055-9965.epi-08-0513] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Recent studies from mouse mapping studies for cancer susceptibility have successfully led to the identification of a handful of susceptibility genes. Ptprj was identified as a strong candidate gene for mouse locus susceptibility to colorectal cancer 1, and one variant, rs1566734, showed evidence of preferential allelic imbalance in human colorectal tumors. Haplotypes in human PTPRJ have also been associated with protective effects for breast cancer risk. To determine if variants or haplotype in PTPRJ confer protective or risk effects for colorectal cancer (CRC), we genotyped rs1566734 and six additional PTPRJ haplotype tagging single nucleotide polymorphisms (SNP) in CRC cases and controls from the Molecular Epidemiology of Colorectal Cancer study. There was no evidence for cancer risk with rs1566734 in 1,897 cases and 1,954 controls with a homozygote odds ratio of 1.09 and 95% confidence interval of 0.85 to 1.39. The 6 tagging SNPs resulted in 6 main haplotypes (frequencies, >1%). None of the six tagSNPs individually showed significant evidence for risk; however, rs1503185 showed a nonsignificant protective effect. One haplotype was overrepresented in cases compared with controls, corresponding to a 34% increase in risk CRC, but there was no significant difference overall in haplotype frequencies between cases and controls (global test P statistic=0.19). From this study, we observe no significant increase in risk for human CRC with variants or haplotypes in PTPRJ. Additional studies are warranted to study possible PTPRJ-interacting loci, which are observed with Scc1 in the mouse models for CRC susceptibility.
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Affiliation(s)
- Amanda E Toland
- Department of Molecular Virology, Immunology and Medical Genetics, Human Cancer Genetics Program, Division of Human Genetics, Ohio State University Comprehensive Cancer Center, The Ohio State University, Columbus, Ohio, USA.
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New role for the protein tyrosine phosphatase DEP-1 in Akt activation and endothelial cell survival. Mol Cell Biol 2008; 29:241-53. [PMID: 18936167 DOI: 10.1128/mcb.01374-08] [Citation(s) in RCA: 68] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
Abstract
Functional inactivation of the protein tyrosine phosphatase DEP-1 leads to increased endothelial cell proliferation and failure of vessels to remodel and branch. DEP-1 has also been proposed to contribute to the contact inhibition of endothelial cell growth via dephosphorylation of vascular endothelial growth factor receptor 2 (VEGFR2), a mediator of vascular development. However, how DEP-1 regulates VEGF-dependent signaling and biological responses remains ill-defined. We show here that DEP-1 targets tyrosine residues in the VEGFR2 kinase activation loop. Consequently, depletion of DEP-1 results in the increased phosphorylation of all major VEGFR2 autophosphorylation sites, but surprisingly, not in the overall stimulation of VEGF-dependent signaling. The increased phosphorylation of Src on Y529 under these conditions results in impaired Src and Akt activation. This inhibition is similarly observed upon expression of catalytically inactive DEP-1, and coexpression of an active Src-Y529F mutant rescues Akt activation. Reduced Src activity correlates with decreased phosphorylation of Gab1, an adapter protein involved in VEGF-dependent Akt activation. Hypophosphorylated Gab1 is unable to fully associate with phosphatidylinositol 3-kinase, VEGFR2, and VE-cadherin complexes, leading to suboptimal Akt activation and increased cell death. Overall, our results reveal that despite its negative role on global VEGFR2 phosphorylation, DEP-1 is a positive regulator of VEGF-mediated Src and Akt activation and endothelial cell survival.
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32
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Latini FRM, Hemerly JP, Oler G, Riggins GJ, Cerutti JM. Re-expression of ABI3-binding protein suppresses thyroid tumor growth by promoting senescence and inhibiting invasion. Endocr Relat Cancer 2008; 15:787-99. [PMID: 18559958 PMCID: PMC2742300 DOI: 10.1677/erc-08-0079] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
Loss of ABI gene family member 3-binding protein (ABI3BP) expression may be functionally involved in the pathogenesis of cancer. Previous reports have indicated a loss of expression in lung cancer and a presumed role in inducing cellular senescence. We show here that ABI3BP expression is significantly decreased in most malignant thyroid tumors of all types. To better understand ABI3BP's role, we created a model by re-expressing ABI3BP in two thyroid cancer cell lines. Re-expression of ABI3BP in thyroid cells resulted in a decrease in transforming activity, cell growth, cell viability, migration, invasion, and tumor growth in nude mice. ABI3BP re-expression appears to trigger cellular senescence through the p21 pathway. Additionally, ABI3BP induced formation of heterochromatin 1-binding protein gamma-positive senescence-associated (SA) heterochromatin foci and accumulation of SA beta-galactosidase. The combination of a decrease in cell growth, invasion, and other effects upon ABI3BP re-expression in vitro helps to explain the large reduction in tumor growth that we observed in nude mice. Together, our data provide evidence that the loss of ABI3BP expression could play a functional role in thyroid tumorigenesis. Activation of ABI3BP or its pathway may represent a possible basis for targeted therapy of certain cancers.
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Affiliation(s)
- Flavia R. M. Latini
- Genetic Bases of Thyroid Tumors Laboratory, Division of Genetics, Department of Morphology and Genetics; Federal University of São Paulo, SP, Brazil
| | - Jefferson P. Hemerly
- Genetic Bases of Thyroid Tumors Laboratory, Division of Genetics, Department of Morphology and Genetics; Federal University of São Paulo, SP, Brazil
| | - Gisele Oler
- Genetic Bases of Thyroid Tumors Laboratory, Division of Genetics, Department of Morphology and Genetics; Federal University of São Paulo, SP, Brazil
| | - Gregory J. Riggins
- Department of Neurosurgery, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Janete M. Cerutti
- Genetic Bases of Thyroid Tumors Laboratory, Division of Genetics, Department of Morphology and Genetics; Federal University of São Paulo, SP, Brazil
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Lrig1 is an endogenous inhibitor of Ret receptor tyrosine kinase activation, downstream signaling, and biological responses to GDNF. J Neurosci 2008; 28:39-49. [PMID: 18171921 DOI: 10.1523/jneurosci.2196-07.2008] [Citation(s) in RCA: 83] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
Glial cell line-derived neurotrophic factor (GDNF)/Ret signaling has potent trophic effects on ventral midbrain dopaminergic, motor, sensory, and sympathetic neurons. The molecular mechanisms that restrict Ret receptor tyrosine kinase activation are not well understood. Here, we show that Lrig1, a transmembrane protein containing leucine-rich repeats and Ig-like domains in its extracellular region, acts in a negative feedback loop to regulate the activity of Ret receptor tyrosine kinase. In particular, we demonstrate that Lrig1 is capable of physically interacting with Ret and that Lrig1/Ret association inhibits GDNF binding, recruitment of Ret to lipid rafts, receptor autophosphorylation, and mitogen-activated protein kinase (MAPK) activation in response to GDNF. In neuronal cells, Lrig1 overexpression also inhibits GDNF/Ret-induced neurite outgrowth in a cell-autonomous manner. Downregulation of Lrig1 using small interference RNA knock-down experiments potentiates both neuronal differentiation and MAPK activation in response to GDNF. Together, these results provide an insight into Lrig1 function and establish a new physiological mechanism to restrict signaling and biological responses induced by GDNF and Ret in neuronal cells.
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34
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Novellino L, De Filippo A, Deho P, Perrone F, Pilotti S, Parmiani G, Castelli C. PTPRK negatively regulates transcriptional activity of wild type and mutated oncogenic beta-catenin and affects membrane distribution of beta-catenin/E-cadherin complexes in cancer cells. Cell Signal 2008; 20:872-83. [PMID: 18276111 DOI: 10.1016/j.cellsig.2007.12.024] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2007] [Revised: 12/20/2007] [Accepted: 12/21/2007] [Indexed: 12/01/2022]
Abstract
Previous reports showed that receptor-type protein-tyrosine phosphatase PTPRK co-localizes with beta-catenin at adherens junctions, and in vitro experiments suggested that beta-catenin could be substrate of PTPRK-mediated phosphatase activity. beta-catenin is a molecule endowed with a dual function being involved both in cell adhesion and in Wnt signaling pathway. Here we provide evidence for the role of PTPRK in negatively regulating the beta-catenin transcriptional activity by modulating its intracellular and membrane distribution. Expression of PTPRK protein in HEK293 cells and in PTPRK-null melanoma cell lines, one of which harbors a mutated oncogenic beta-catenin, impairs nuclear accumulation of wild type and oncogenic forms of beta-catenin, limits cytosolic levels of tyrosine-phosphorylated beta-catenin, and leads to re-localization of E-cadherin/beta-catenin complexes in ordered membrane phase along cell-cell contacts. This re-modulation of beta-catenin cellular distribution results in the inhibition of cyclin D1 and c-myc protein expression, whose genes are targets of beta-catenin. Tumor cells upon re-expression of PTPRK have a reduced proliferative and migration capacity. Moreover we show that PTPRK is also active in negatively regulating the transactivating function of beta-catenin in normal melanocytes as confirmed by experiments with silenced PTPRK by specific siRNA. Our data show that PTPRK influences transactivating activity of beta-catenin in non-tumoral and neoplastic cells by regulating the balance between signaling and adhesive beta-catenin, thus providing biochemical basis for the hypothesis of PTPRK as a tumor suppressor gene.
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Affiliation(s)
- Luisa Novellino
- Unit of Immunotherapy of Human Tumors, Department of Experimental Oncology, Fondazione IRCCS Istituto Nazionale dei Tumori, Milan, Italy
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35
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Abstract
PURPOSE OF REVIEW The present review will provide an update of important studies in medullary thyroid cancer (MTC) with an emphasis on targeted preclinical and translational research studies published over the past 2 years. RECENT FINDINGS Recent advances in the biology of MTC, particularly in RET proto-oncogene signaling, are now being translated into promising new therapies and biomarkers. Multifunction tyrosine kinase inhibitors that target RET, plus vascular endothelial growth factor receptors and additional kinases, are now being evaluated in Phase II clinical trials in MTC. Important unanswered questions include the optimal means for selecting high-risk patients, appropriate biomarkers for monitoring kinase inhibitor trials, and trial endpoints. Similar to ABL, epidermal growth factor receptors and other kinases, individual mutant RET forms have differential sensitivity to different inhibitors. In addition to RET, an old marker, calcitonin, has assumed increasing importance, but may not adequately reflect changes in tumor burden in RET inhibitor trials. A number of new therapeutic strategies are being developed that could be appropriate for the approximately 50% of patients who lack RET mutations in their tumors. SUMMARY Progress is being made toward effective targeted MTC therapy. Patients with advanced, progressive MTC should be considered for enrollment in clinical trials.
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Affiliation(s)
- Douglas W Ball
- Division of Endocrinology and Metabolism, Johns Hopkins University School of Medicine, Suite 333, 1830 E Monument Street, Baltimore, MD 21287, USA.
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36
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Runeberg-Roos P, Saarma M. Neurotrophic factor receptor RET: structure, cell biology, and inherited diseases. Ann Med 2007; 39:572-80. [PMID: 17934909 DOI: 10.1080/07853890701646256] [Citation(s) in RCA: 70] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
RET (REarranged during Transfection) is a transmembrane receptor tyrosine kinase that is activated by a complex consisting of a soluble glial cell line-derived neurotrophic factor (GDNF) family ligand (GFL) and a glycosyl phosphatidylinositol-anchored co-receptor, GDNF family receptors alpha (GFRalpha). RET signalling is crucial for the development of the enteric nervous system. RET also regulates the development of sympathetic, parasympathetic, motor, and sensory neurons, and is necessary for the postnatal maintenance of dopaminergic neurons. The effect of GFLs on sensory, motor, and dopaminergic neurons has raised clinical interest towards these ligands. Outside the nervous system, RET is crucial for development of the kidney and plays a key role in spermatogenesis. Inactivating mutations in RET cause the Hirschsprung's disease characterized by megacolon aganglionosis. In contrast, activating mutations give rise to different types of cancer, multiple endocrine neoplasia type 2A and type 2B, familial medullary thyroid carcinoma, and papillary thyroid carcinoma. The multiple disease phenotypes correlate with differences in the molecular and cell biological functions of different oncogenic RET proteins. In this review we summarize how the different domains of the RET protein contribute to its normal function and how mutations in these domains affect the function of the receptor.
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Affiliation(s)
- Pia Runeberg-Roos
- Institute of Biotechnology, Viikki Biocenter, University of Helsinki, Finland
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37
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Current World Literature. Curr Opin Oncol 2007; 19:65-9. [PMID: 17133115 DOI: 10.1097/cco.0b013e328012d5fa] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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