1
|
Corbella E, Fara C, Covarelli F, Porreca V, Palmisano B, Mignogna G, Corsi A, Riminucci M, Maras B, Mancone C. THBS1 and THBS2 Enhance the In Vitro Proliferation, Adhesion, Migration and Invasion of Intrahepatic Cholangiocarcinoma Cells. Int J Mol Sci 2024; 25:1782. [PMID: 38339060 PMCID: PMC10855656 DOI: 10.3390/ijms25031782] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2023] [Revised: 01/17/2024] [Accepted: 01/30/2024] [Indexed: 02/12/2024] Open
Abstract
In intrahepatic cholangiocarcinoma (iCCA), thrombospondin 1 (THBS1) and 2 (THBS2) are soluble mediators released in the tumor microenvironment (TME) that contribute to the metastatic spreading of iCCA cells via a lymphatic network by the trans-differentiation of vascular endothelial cells to a lymphatic-like phenotype. To study the direct role of THBS1 and THBS2 on the iCCA cells, well-established epithelial (HuCCT-1) and mesenchymal (CCLP1) iCCA cell lines were subjected to recombinant human THBS1 and THBS2 (rhTHBS1, rhTHBS2) for cellular function assays. Cell growth, cell adhesion, migration, and invasion were all enhanced in both CCLP1 and HuCCT-1 cells by the treatment with either rhTHBS1 or rhTHBS2, although they showed some variability in their intensity of speeding up cellular processes. rhTHBS2 was more intense in inducing invasiveness and in committing the HuCCT-1 cells to a mesenchymal-like phenotype and was therefore a stronger enhancer of the malignant behavior of iCCA cells compared to rhTHBS1. Our data extend the role of THBS1 and THBS2, which are not only able to hinder the vascular network and promote tumor-associated lymphangiogenesis but also exacerbate the malignant behavior of the iCCA cells.
Collapse
Affiliation(s)
- Eleonora Corbella
- Department of Molecular Medicine, Sapienza University of Rome, Viale del Policlinico 155, 00161 Rome, Italy; (E.C.); (C.F.); (F.C.); (V.P.); (A.C.); (M.R.)
| | - Claudia Fara
- Department of Molecular Medicine, Sapienza University of Rome, Viale del Policlinico 155, 00161 Rome, Italy; (E.C.); (C.F.); (F.C.); (V.P.); (A.C.); (M.R.)
| | - Francesca Covarelli
- Department of Molecular Medicine, Sapienza University of Rome, Viale del Policlinico 155, 00161 Rome, Italy; (E.C.); (C.F.); (F.C.); (V.P.); (A.C.); (M.R.)
| | - Veronica Porreca
- Department of Molecular Medicine, Sapienza University of Rome, Viale del Policlinico 155, 00161 Rome, Italy; (E.C.); (C.F.); (F.C.); (V.P.); (A.C.); (M.R.)
| | - Biagio Palmisano
- Department of Radiology, Oncology and Pathology, Sapienza University of Rome, Viale del Policlinico 155, 00161 Rome, Italy;
| | - Giuseppina Mignogna
- Department of Biochemistry Science, Sapienza University of Rome, Viale Regina Elena 332, 00185 Rome, Italy; (G.M.); (B.M.)
| | - Alessandro Corsi
- Department of Molecular Medicine, Sapienza University of Rome, Viale del Policlinico 155, 00161 Rome, Italy; (E.C.); (C.F.); (F.C.); (V.P.); (A.C.); (M.R.)
| | - Mara Riminucci
- Department of Molecular Medicine, Sapienza University of Rome, Viale del Policlinico 155, 00161 Rome, Italy; (E.C.); (C.F.); (F.C.); (V.P.); (A.C.); (M.R.)
| | - Bruno Maras
- Department of Biochemistry Science, Sapienza University of Rome, Viale Regina Elena 332, 00185 Rome, Italy; (G.M.); (B.M.)
| | - Carmine Mancone
- Department of Molecular Medicine, Sapienza University of Rome, Viale del Policlinico 155, 00161 Rome, Italy; (E.C.); (C.F.); (F.C.); (V.P.); (A.C.); (M.R.)
| |
Collapse
|
2
|
Bian HT, Shen YW, Zhou YD, Nagle DG, Guan YY, Zhang WD, Luan X. CD47: Beyond an immune checkpoint in cancer treatment. Biochim Biophys Acta Rev Cancer 2022; 1877:188771. [PMID: 35931392 DOI: 10.1016/j.bbcan.2022.188771] [Citation(s) in RCA: 16] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2022] [Revised: 06/23/2022] [Accepted: 07/29/2022] [Indexed: 11/29/2022]
Abstract
The transmembrane protein, CD47, is recognized as an important innate immune checkpoint, and CD47-targeted drugs have been in development with the aim of inhibiting the interaction between CD47 and the regulatory glycoprotein SIRPα, for antitumor immunotherapy. Further, CD47 mediates other essential functions such as cell proliferation, caspase-independent cell death (CICD), angiogenesis and other integrin-activation-dependent cell phenotypic responses when bound to thrombospondin-1 (TSP-1) or other ligands. Mounting strategies that target CD47 have been developed in pre-clinical and clinical trials, including antibodies, small molecules, siRNAs, and peptides, and some of them have shown great promise in cancer treatment. Herein, the authors endeavor to provide a retrospective of ligand-mediated CD47 regulatory mechanisms, their roles in controlling antitumor intercellular and intracellular signal transduction, and an overview of CD47-targetd drug design.
Collapse
Affiliation(s)
- Hui-Ting Bian
- Shanghai Frontiers Science Center for Chinese Medicine Chemical Biology, Institute of Interdisciplinary Integrative Medicine Research, Shanghai University of Traditional Chinese Medicine, Shanghai 201203, China; School of Pharmacy, Fudan University, Shanghai 201203, China
| | - Yi-Wen Shen
- Shanghai Frontiers Science Center for Chinese Medicine Chemical Biology, Institute of Interdisciplinary Integrative Medicine Research, Shanghai University of Traditional Chinese Medicine, Shanghai 201203, China
| | - Yu-Dong Zhou
- Shanghai Frontiers Science Center for Chinese Medicine Chemical Biology, Institute of Interdisciplinary Integrative Medicine Research, Shanghai University of Traditional Chinese Medicine, Shanghai 201203, China; Department of Chemistry and Biochemistry, College of Liberal Arts, University of Mississippi, University, MS, 38677-1848, USA
| | - Dale G Nagle
- Shanghai Frontiers Science Center for Chinese Medicine Chemical Biology, Institute of Interdisciplinary Integrative Medicine Research, Shanghai University of Traditional Chinese Medicine, Shanghai 201203, China; Department of BioMolecular Sciences and Research Institute of Pharmaceutical Sciences, School of Pharmacy, University of Mississippi, University, MS 38677-1848, USA
| | - Ying-Yun Guan
- Department of Pharmacy, Ruijin Hospital, Shanghai Jiaotong University School of Medicine, Shanghai 200025, China.
| | - Wei-Dong Zhang
- Shanghai Frontiers Science Center for Chinese Medicine Chemical Biology, Institute of Interdisciplinary Integrative Medicine Research, Shanghai University of Traditional Chinese Medicine, Shanghai 201203, China.
| | - Xin Luan
- Shanghai Frontiers Science Center for Chinese Medicine Chemical Biology, Institute of Interdisciplinary Integrative Medicine Research, Shanghai University of Traditional Chinese Medicine, Shanghai 201203, China.
| |
Collapse
|
3
|
Voronovic E, Skripka A, Jarockyte G, Ger M, Kuciauskas D, Kaupinis A, Valius M, Rotomskis R, Vetrone F, Karabanovas V. Uptake of Upconverting Nanoparticles by Breast Cancer Cells: Surface Coating versus the Protein Corona. ACS APPLIED MATERIALS & INTERFACES 2021; 13:39076-39087. [PMID: 34378375 PMCID: PMC8824430 DOI: 10.1021/acsami.1c10618] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
Fluorophores with multifunctional properties known as rare-earth-doped nanoparticles (RENPs) are promising candidates for bioimaging, therapy, and drug delivery. When applied in vivo, these nanoparticles (NPs) have to retain long blood-circulation time, bypass elimination by phagocytic cells, and successfully arrive at the target area. Usually, NPs in a biological medium are exposed to proteins, which form the so-called "protein corona" (PC) around the NPs and influence their targeted delivery and accumulation in cells and tissues. Different surface coatings change the PC size and composition, subsequently deciding the fate of the NPs. Thus, detailed studies on the PC are of utmost importance to determine the most suitable NP surface modification for biomedical use. When it comes to RENPs, these studies are particularly scarce. Here, we investigate the PC composition and its impact on the cellular uptake of citrate-, SiO2-, and phospholipid micelle-coated RENPs (LiYF4:Yb3+,Tm3+). We observed that the PC of citrate- and phospholipid-coated RENPs is relatively stable and similar in the adsorbed protein composition, while the PC of SiO2-coated RENPs is larger and highly dynamic. Moreover, biocompatibility, accumulation, and cytotoxicity of various RENPs in cancer cells have been evaluated. On the basis of the cellular imaging, supported by the inhibition studies, it was revealed that RENPs are internalized by endocytosis and that specific endocytic routes are PC composition dependent. Overall, these results are essential to fill the gaps in the fundamental understanding of the nano-biointeractions of RENPs, pertinent for their envisioned application in biomedicine.
Collapse
Affiliation(s)
- Evelina Voronovic
- Biomedical
Physics Laboratory of National Cancer Institute, Baublio 3B, LT-08406 Vilnius, Lithuania
- Life
Sciences Center, Vilnius University, Sauletekio av. 7, LT-10257 Vilnius, Lithuania
- Department
of Chemistry and Bioengineering, Vilnius
Gediminas Technical University, Sauletekio av. 11, LT-10223 Vilnius, Lithuania
| | - Artiom Skripka
- Centre
Énergie, Matériaux et Télécommunications, Institut National de la Recherche Scientifique, Université
du Québec, 1650 Boul. Lionel-Boulet, Varennes, Quebec J3X 1S2, Canada
| | - Greta Jarockyte
- Biomedical
Physics Laboratory of National Cancer Institute, Baublio 3B, LT-08406 Vilnius, Lithuania
- Life
Sciences Center, Vilnius University, Sauletekio av. 7, LT-10257 Vilnius, Lithuania
| | - Marija Ger
- Institute
of Biochemistry, Life Sciences Center, Vilnius
University, Sauletekio
av. 7, LT-10257 Vilnius, Lithuania
| | - Dalius Kuciauskas
- Institute
of Biochemistry, Life Sciences Center, Vilnius
University, Sauletekio
av. 7, LT-10257 Vilnius, Lithuania
| | - Algirdas Kaupinis
- Institute
of Biochemistry, Life Sciences Center, Vilnius
University, Sauletekio
av. 7, LT-10257 Vilnius, Lithuania
| | - Mindaugas Valius
- Institute
of Biochemistry, Life Sciences Center, Vilnius
University, Sauletekio
av. 7, LT-10257 Vilnius, Lithuania
| | - Ricardas Rotomskis
- Biomedical
Physics Laboratory of National Cancer Institute, Baublio 3B, LT-08406 Vilnius, Lithuania
- Biophotonics
Group of Laser Research Centre, Vilnius
University, Sauletekio
av. 9, LT-10222 Vilnius, Lithuania
| | - Fiorenzo Vetrone
- Centre
Énergie, Matériaux et Télécommunications, Institut National de la Recherche Scientifique, Université
du Québec, 1650 Boul. Lionel-Boulet, Varennes, Quebec J3X 1S2, Canada
| | - Vitalijus Karabanovas
- Biomedical
Physics Laboratory of National Cancer Institute, Baublio 3B, LT-08406 Vilnius, Lithuania
- Department
of Chemistry and Bioengineering, Vilnius
Gediminas Technical University, Sauletekio av. 11, LT-10223 Vilnius, Lithuania
| |
Collapse
|
4
|
Kaur S, Bronson SM, Pal-Nath D, Miller TW, Soto-Pantoja DR, Roberts DD. Functions of Thrombospondin-1 in the Tumor Microenvironment. Int J Mol Sci 2021; 22:4570. [PMID: 33925464 PMCID: PMC8123789 DOI: 10.3390/ijms22094570] [Citation(s) in RCA: 78] [Impact Index Per Article: 26.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2021] [Revised: 04/15/2021] [Accepted: 04/23/2021] [Indexed: 12/13/2022] Open
Abstract
The identification of thrombospondin-1 as an angiogenesis inhibitor in 1990 prompted interest in its role in cancer biology and potential as a therapeutic target. Decreased thrombospondin-1 mRNA and protein expression are associated with progression in several cancers, while expression by nonmalignant cells in the tumor microenvironment and circulating levels in cancer patients can be elevated. THBS1 is not a tumor suppressor gene, but the regulation of its expression in malignant cells by oncogenes and tumor suppressor genes mediates some of their effects on carcinogenesis, tumor progression, and metastasis. In addition to regulating angiogenesis and perfusion of the tumor vasculature, thrombospondin-1 limits antitumor immunity by CD47-dependent regulation of innate and adaptive immune cells. Conversely, thrombospondin-1 is a component of particles released by immune cells that mediate tumor cell killing. Thrombospondin-1 differentially regulates the sensitivity of malignant and nonmalignant cells to genotoxic stress caused by radiotherapy and chemotherapy. The diverse activities of thrombospondin-1 to regulate autophagy, senescence, stem cell maintenance, extracellular vesicle function, and metabolic responses to ischemic and genotoxic stress are mediated by several cell surface receptors and by regulating the functions of several secreted proteins. This review highlights progress in understanding thrombospondin-1 functions in cancer and the challenges that remain in harnessing its therapeutic potential.
Collapse
Affiliation(s)
- Sukhbir Kaur
- Laboratory of Pathology, Center for Cancer Research, National Cancer Institute, NIH, Bethesda, MD 20892, USA; (S.K.); (D.P.-N.)
| | - Steven M. Bronson
- Department of Internal Medicine, Section of Molecular Medicine, Comprehensive Cancer Center, Wake Forest School of Medicine, Winston-Salem, NC 27101, USA;
| | - Dipasmita Pal-Nath
- Laboratory of Pathology, Center for Cancer Research, National Cancer Institute, NIH, Bethesda, MD 20892, USA; (S.K.); (D.P.-N.)
| | - Thomas W. Miller
- Centre de Recherche en Cancérologie de Marseille, Institut Paoli-Calmettes, 13273 Marseille, France
| | - David R. Soto-Pantoja
- Department of Surgery and Department of Cancer Biology, Comprehensive Cancer Center, Wake Forest School of Medicine, Winston-Salem, NC 27101, USA
| | - David D. Roberts
- Laboratory of Pathology, Center for Cancer Research, National Cancer Institute, NIH, Bethesda, MD 20892, USA; (S.K.); (D.P.-N.)
| |
Collapse
|
5
|
Whatley M, Francis A, Ng ZY, Khoh XE, Atlas MD, Dilley RJ, Wong EYM. Usher Syndrome: Genetics and Molecular Links of Hearing Loss and Directions for Therapy. Front Genet 2020; 11:565216. [PMID: 33193648 PMCID: PMC7642844 DOI: 10.3389/fgene.2020.565216] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2020] [Accepted: 09/21/2020] [Indexed: 12/19/2022] Open
Abstract
Usher syndrome (USH) is an autosomal recessive (AR) disorder that permanently and severely affects the senses of hearing, vision, and balance. Three clinically distinct types of USH have been identified, decreasing in severity from Type 1 to 3, with symptoms of sensorineural hearing loss (SNHL), retinitis pigmentosa (RP), and vestibular dysfunction. There are currently nine confirmed and two suspected USH-causative genes, and a further three candidate loci have been mapped. The proteins encoded by these genes form complexes that play critical roles in the development and maintenance of cellular structures within the inner ear and retina, which have minimal capacity for repair or regeneration. In the cochlea, stereocilia are located on the apical surface of inner ear hair cells (HC) and are responsible for transducing mechanical stimuli from sound pressure waves into chemical signals. These signals are then detected by the auditory nerve fibers, transmitted to the brain and interpreted as sound. Disease-causing mutations in USH genes can destabilize the tip links that bind the stereocilia to each other, and cause defects in protein trafficking and stereocilia bundle morphology, thereby inhibiting mechanosensory transduction. This review summarizes the current knowledge on Usher syndrome with a particular emphasis on mutations in USH genes, USH protein structures, and functional analyses in animal models. Currently, there is no cure for USH. However, the genetic therapies that are rapidly developing will benefit from this compilation of detailed genetic information to identify the most effective strategies for restoring functional USH proteins.
Collapse
Affiliation(s)
- Meg Whatley
- Ear Science Institute Australia, Nedlands, WA, Australia
| | - Abbie Francis
- Ear Science Institute Australia, Nedlands, WA, Australia
- Emergency Medicine, The University of Western Australia, Nedlands, WA, Australia
| | - Zi Ying Ng
- Ear Science Institute Australia, Nedlands, WA, Australia
| | - Xin Ee Khoh
- Ear Science Institute Australia, Nedlands, WA, Australia
- School of Human Sciences, The University of Western Australia, Nedlands, WA, Australia
| | - Marcus D. Atlas
- Ear Science Institute Australia, Nedlands, WA, Australia
- Ear Sciences Centre, The University of Western Australia, Nedlands, WA, Australia
| | - Rodney J. Dilley
- Ear Science Institute Australia, Nedlands, WA, Australia
- Ear Sciences Centre, The University of Western Australia, Nedlands, WA, Australia
- Centre for Cell Therapy and Regenerative Medicine, The University of Western Australia, Perth, WA, Australia
| | - Elaine Y. M. Wong
- Ear Science Institute Australia, Nedlands, WA, Australia
- Ear Sciences Centre, The University of Western Australia, Nedlands, WA, Australia
- School of Pharmacy and Biomedical Sciences, Faculty of Health Sciences, Curtin University, Bentley, WA, Australia
| |
Collapse
|
6
|
Jefferson B, Ali M, Grant S, Frampton G, Ploof M, Andry S, DeMorrow S, McMillin M. Thrombospondin-1 Exacerbates Acute Liver Failure and Hepatic Encephalopathy Pathology in Mice by Activating Transforming Growth Factor β1. THE AMERICAN JOURNAL OF PATHOLOGY 2020; 190:347-357. [PMID: 31734229 PMCID: PMC7013272 DOI: 10.1016/j.ajpath.2019.10.003] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/18/2019] [Revised: 09/28/2019] [Accepted: 10/21/2019] [Indexed: 12/11/2022]
Abstract
Severe hepatic insults can lead to acute liver failure and hepatic encephalopathy (HE). Transforming growth factor β1 (TGFβ1) has been shown to contribute to HE during acute liver failure; however, TGFβ1 must be activated to bind its receptor and generate downstream effects. One protein that can activate TGFβ1 is thrombospondin-1 (TSP-1). Therefore, the aim of this study was to assess TSP-1 during acute liver failure and HE pathogenesis. C57Bl/6 or TSP-1 knockout (TSP-1-/-) mice were injected with azoxymethane (AOM) to induce acute liver failure and HE. Liver damage, neurologic decline, and molecular analyses of TSP-1 and TGFβ1 signaling were performed. AOM-treated mice had increased TSP-1 and TGFβ1 mRNA and protein expression in the liver. TSP-1-/- mice administered AOM had reduced liver injury as assessed by histology and serum transaminase levels compared with C57Bl/6 AOM-treated mice. TSP-1-/- mice treated with AOM had reduced TGFβ1 signaling that was associated with less hepatic cell death as assessed by terminal deoxynucleotidyl transferase-mediated dUTP nick-end labeling staining and cleaved caspase 3 expression. TSP-1-/- AOM-treated mice had a reduced rate of neurologic decline, less cerebral edema, and a decrease in microglia activation in comparison with C57Bl/6 mice treated with AOM. Taken together, TSP-1 is an activator of TGFβ1 signaling during AOM-induced acute liver failure and contributes to both liver pathology and HE progression.
Collapse
Affiliation(s)
| | - Malaika Ali
- Central Texas Veterans Health Care System, Austin, Texas
| | - Stephanie Grant
- Department of Medical Physiology, Texas A&M University Health Science Center, Temple, Texas; Division of Pharmacology and Toxicology, College of Pharmacy, The University of Texas at Austin, Austin, Texas
| | - Gabriel Frampton
- Department of Medical Physiology, Texas A&M University Health Science Center, Temple, Texas; Department of Internal Medicine, The University of Texas at Austin Dell Medical School, Austin, Texas
| | - Michaela Ploof
- Central Texas Veterans Health Care System, Austin, Texas
| | - Sarah Andry
- Department of Internal Medicine, Baylor Scott & White Health, Temple, Texas
| | - Sharon DeMorrow
- Central Texas Veterans Health Care System, Austin, Texas; Department of Medical Physiology, Texas A&M University Health Science Center, Temple, Texas; Division of Pharmacology and Toxicology, College of Pharmacy, The University of Texas at Austin, Austin, Texas; Department of Internal Medicine, The University of Texas at Austin Dell Medical School, Austin, Texas
| | - Matthew McMillin
- Central Texas Veterans Health Care System, Austin, Texas; Department of Internal Medicine, The University of Texas at Austin Dell Medical School, Austin, Texas.
| |
Collapse
|
7
|
Ramchandani D, Mittal V. Thrombospondin in Tumor Microenvironment. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2020; 1272:133-147. [PMID: 32845506 DOI: 10.1007/978-3-030-48457-6_8] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Thrombospondins (TSPs) are multifaceted proteins that contribute to physiologic as well as pathologic conditions. Due to their multiple receptor-binding domains, TSPs display both oncogenic and tumor-suppressive qualities and are thus essential components of the extracellular matrix. Known for their antiangiogenic capacity, TSPs are an important component of the tumor microenvironment. The N- and C-terminal domains of TSP are, respectively, involved in cell adhesion and spreading, an important feature of wound healing as well as cancer cell migration. Previously known for the activation of TGF-β to promote tumor growth and inflammation, TSP-1 has recently been found to be transcriptionally induced by TGF-β, implying the presence of a possible feedback loop. TSP-1 is an endogenous inhibitor of T cells and also mediates its immunosuppressive effects via induction of Tregs. Given the diverse roles of TSPs in the tumor microenvironment, many therapeutic strategies have utilized TSP-mimetic peptides or antibody blockade as anti-metastatic approaches. This chapter discusses the diverse structural domains, functional implications, and anti-metastatic therapies in the context of the role of TSP in the tumor microenvironment.
Collapse
Affiliation(s)
- Divya Ramchandani
- Department of Cardiothoracic Surgery, Weill Cornell Medicine, New York, NY, USA
| | - Vivek Mittal
- Department of Cardiothoracic Surgery, Weill Cornell Medicine, New York, NY, USA.
| |
Collapse
|
8
|
Hiroshima Y, Kasajima R, Kimura Y, Komura D, Ishikawa S, Ichikawa Y, Bouvet M, Yamamoto N, Oshima T, Morinaga S, Singh SR, Hoffman RM, Endo I, Miyagi Y. Novel targets identified by integrated cancer-stromal interactome analysis of pancreatic adenocarcinoma. Cancer Lett 2020; 469:217-227. [DOI: 10.1016/j.canlet.2019.10.031] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2019] [Revised: 10/03/2019] [Accepted: 10/18/2019] [Indexed: 12/27/2022]
|
9
|
Kamijo H, Miyagaki T, Takahashi-Shishido N, Nakajima R, Oka T, Suga H, Sugaya M, Sato S. Thrombospondin-1 promotes tumor progression in cutaneous T-cell lymphoma via CD47. Leukemia 2019; 34:845-856. [PMID: 31712778 DOI: 10.1038/s41375-019-0622-6] [Citation(s) in RCA: 41] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2019] [Revised: 10/18/2019] [Accepted: 11/03/2019] [Indexed: 01/05/2023]
Abstract
CD47 is highly expressed on various hematopoietic malignancies, and enables cancer cells to avoid immunosurveillance. Its ligand, thromobospondin-1 (TSP-1) is a multifunctional protein, and CD47/TSP-1 interactions promote tumor progression in various malignancies. In this study, we investigated roles of TSP-1 and CD47 in cutaneous T-cell lymphoma (CTCL). Flow cytometric analysis and immunohistochemistry showed that CTCL tumor cells and CTCL cell lines (Hut78, HH, and MyLa cells) overexpressed CD47 compared with normal CD4+ T cells. Overexpression of CD47 was partially induced by high c-Myc expression in CTCL tumor cells. TSP-1 mRNA expression levels in CTCL lesional skin were higher than those in normal skin and correlated with increased risk of disease-related death. Moreover, TSP-1 was expressed on CTCL tumor cells by immunohistochemistry. Serum soluble TSP-1 levels in patients with Sézary syndrome were significantly elevated. TSP-1 promotes proliferation and survival of CTCL tumor cells, which is inhibited by anti-CD47 neutralizing antibody or CD47 knockdown. Stimulation with TSP-1 also induces cell migration and in vivo growth. These effects were mediated by phosphorylation of ERK1/2 and AKT and expression of survivin. Collectively, our findings prompt a novel therapeutic approach to CTCL based on discovery that CD47/TSP-1 interactions play important roles in progression of CTCL.
Collapse
Affiliation(s)
- Hiroaki Kamijo
- Department of Dermatology, University of Tokyo Graduate School of Medicine, Tokyo, Japan
| | - Tomomitsu Miyagaki
- Department of Dermatology, University of Tokyo Graduate School of Medicine, Tokyo, Japan.
| | - Naomi Takahashi-Shishido
- Department of Dermatology, University of Tokyo Graduate School of Medicine, Tokyo, Japan.,Department of Dermatology, International University of Health and Welfare, Chiba, Japan
| | - Rina Nakajima
- Department of Dermatology, University of Tokyo Graduate School of Medicine, Tokyo, Japan
| | - Tomonori Oka
- Department of Dermatology, University of Tokyo Graduate School of Medicine, Tokyo, Japan
| | - Hiraku Suga
- Department of Dermatology, University of Tokyo Graduate School of Medicine, Tokyo, Japan
| | - Makoto Sugaya
- Department of Dermatology, University of Tokyo Graduate School of Medicine, Tokyo, Japan.,Department of Dermatology, International University of Health and Welfare, Chiba, Japan
| | - Shinichi Sato
- Department of Dermatology, University of Tokyo Graduate School of Medicine, Tokyo, Japan
| |
Collapse
|
10
|
Huang T, Sun L, Yuan X, Qiu H. Thrombospondin-1 is a multifaceted player in tumor progression. Oncotarget 2017; 8:84546-84558. [PMID: 29137447 PMCID: PMC5663619 DOI: 10.18632/oncotarget.19165] [Citation(s) in RCA: 94] [Impact Index Per Article: 13.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2017] [Accepted: 06/28/2017] [Indexed: 01/21/2023] Open
Abstract
Thrombospondins are a family of extracellular matrix (ECM) proteins. Thrombospondin-1 (TSP1) was the first member to be identified and is a main player in tumor microenvironment. The diverse functions of TSP1 depend on the interactions between its structural domains and multiple cell surface molecules. TSP1 acts as an angiogenesis inhibitor by stimulating endothelial cell apoptosis, inhibiting endothelial cell migration and proliferation, and regulating vascular endothelial growth factor bioavailability and activity. In addition to angiogenesis modulation, TSP1 also affects tumor cell adhesion, invasion, migration, proliferation, apoptosis and tumor immunity. This review discusses the multifaceted and sometimes opposite effects of TSP1 on tumor progression depending on the molecular and cellular composition of the microenvironment. Clinical implications of TSP1-related compounds are also discussed.
Collapse
Affiliation(s)
- Tingting Huang
- Department of Oncology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, PR China
| | - Li Sun
- Department of Oncology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, PR China
| | - Xianglin Yuan
- Department of Oncology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, PR China
| | - Hong Qiu
- Department of Oncology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, PR China
| |
Collapse
|
11
|
Abstract
Background: Thrombospondins (TSPs) are recognized as important glycoproteins that regulate a wide variety of cell functions and interactions. TSPs in malignant tumors can both enhance and inhibit tumor progression, invasion, and metastasis, depending on cell type, stromal interactions, and microenvironment. These proteins are potential targets for anticancer therapy. Objective: The aim of our article is to review the role of thrombospondin-1 (TSP1) in cutaneous melanoma. Conclusions: TSP1 expression is variable in melanoma cell lines and tumors. Similar to findings in other human cancers, expression of TSP1 by melanoma cells usually inhibits tumor progression via the antiangiogenic effect of TSP1. Conversely, stromal TSP1 overexpression in melanoma is a poor prognostic factor associated with decreased survival. Understanding the interactions of TSP1 with other melanoma- and matrix-associated proteins should provide new prognostic indices and possible therapeutic targets for melanoma treatment.
Collapse
Affiliation(s)
- M. J. Trotter
- Department of Pathology and Laboratory Medicine, University of Calgary, Calgary Laboratory Services, Calgary, Alberta, Canada
| | - R. Colwell
- Department of Pathology and Laboratory Medicine, University of Calgary, Calgary Laboratory Services, Calgary, Alberta, Canada
| | - V. A. Tron
- Department of Pathology and Laboratory Medicine, University of Alberta, Edmonton, Alberta, Canada
| |
Collapse
|
12
|
Wu MP, Wu LW, Chou CY. The anticancer potential of thrombospondin-1 by inhibiting angiogenesis and stroma reaction during cervical carcinogenesis. Gynecol Minim Invasive Ther 2016. [DOI: 10.1016/j.gmit.2015.09.001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
|
13
|
Sugino IK, Sun Q, Springer C, Cheewatrakoolpong N, Liu T, Li H, Zarbin MA. Two Bioactive Molecular Weight Fractions of a Conditioned Medium Enhance RPE Cell Survival on Age-Related Macular Degeneration and Aged Bruch's Membrane. Transl Vis Sci Technol 2016; 5:8. [PMID: 26933521 PMCID: PMC4771074 DOI: 10.1167/tvst.5.1.8] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2015] [Accepted: 01/01/2016] [Indexed: 12/30/2022] Open
Abstract
PURPOSE To characterize molecular weight fractions of bovine corneal endothelial cell conditioned medium (CM) supporting retinal pigment epithelium (RPE) cell survival on aged and age-related macular degeneration (AMD) Bruch's membrane. METHODS CM was subject to size separation using centrifugal filters. Retentate and filtrate fractions were tested for bioactivity by analyzing RPE survival on submacular Bruch's membrane of aged and AMD donor eyes and behavior on collagen I-coated tissue culture wells. Protein and peptide composition of active fractions was determined by mass spectrometry. RESULTS Two bioactive fractions, 3-kDa filtrate and a 10-50-kDa fraction, were necessary for RPE survival on aged and AMD Bruch's membrane. The 3-kDa filtrate, but not the 10-50-kDa fraction, supported RPE growth on collagen 1-coated tissue culture plates. Mass spectrometry of the 10-50-kDa fraction identified 175 extracellular proteins, including growth factors and extracellular matrix molecules. Transforming growth factor (TGF)β-2 was identified as unique to active CM. Peptides representing 29 unique proteins were identified in the 3-KDa filtrate. CONCLUSIONS These results indicate there is a minimum of two bioactive molecules in CM, one found in the 3-kDa filtrate and one in the 10-50-kDa fraction, and that bioactive molecules in both fractions must be present to ensure RPE survival on Bruch's membrane. Mass spectrometry analysis suggested proteins to test in future studies to identify proteins that may contribute to CM bioactivity. TRANSLATIONAL RELEVANCE Results of this study are the first steps in development of an adjunct to cell-based therapy to ensure cell transplant survival and functionality in AMD patients.
Collapse
Affiliation(s)
- Ilene K Sugino
- Institute of Ophthalmology and Visual Science Rutgers, New Jersey Medical School, Newark, NJ, USA
| | - Qian Sun
- Institute of Ophthalmology and Visual Science Rutgers, New Jersey Medical School, Newark, NJ, USA
| | - Carola Springer
- Institute of Ophthalmology and Visual Science Rutgers, New Jersey Medical School, Newark, NJ, USA
| | | | - Tong Liu
- Department of Biochemistry and Molecular Biology, Center for Advanced Proteomics Research, Neuroproteomics Core Facility, Rutgers, New Jersey Medical School, Newark, NJ, USA
| | - Hong Li
- Department of Biochemistry and Molecular Biology, Center for Advanced Proteomics Research, Neuroproteomics Core Facility, Rutgers, New Jersey Medical School, Newark, NJ, USA
| | - Marco A Zarbin
- Institute of Ophthalmology and Visual Science Rutgers, New Jersey Medical School, Newark, NJ, USA
| |
Collapse
|
14
|
Hypoxia-inducible miR-210 contributes to preeclampsia via targeting thrombospondin type I domain containing 7A. Sci Rep 2016; 6:19588. [PMID: 26796133 PMCID: PMC4726282 DOI: 10.1038/srep19588] [Citation(s) in RCA: 72] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2015] [Accepted: 11/02/2015] [Indexed: 12/19/2022] Open
Abstract
Preeclampsia, a relatively common pregnancy disorder, is a major contributor to maternal mortality and morbidity worldwide. An elevation in microRNA-210 (miR-210) expression in the placenta has been reported to be associated with preeclampsia. Our bioinformatic analysis showed that thrombospondin type I domain containing 7A (THSD7A) is a predicted target for miR-210. The aim of this study was to determine whether miR-210 is involved in preeclampsia through its targeting of THSD7A in human placental trophoblasts. In preeclamptic placental tissues, THSD7A levels were significantly downregulated, and were inversely correlated with the levels of miR-210. THSD7A was validated as a direct target of miR-210 using quantitative real time PCR (qRT-PCR), Western blotting, and dual luciferase assays in HTR8/SVneo cells. Transwell insert invasion assays showed that THSD7A mediated the invasion-inhibitory effect of miR-210 in HTR8/SVneo cells. Interestingly, hypoxia markedly increased miR-210 expression while suppressing THSD7A expression in a time-dependent manner in HTR8/SVneo cells. This study provides novel data on the function of THSD7A in human placental cells, and extends our knowledge of how miR-210 is involved in the development of the preeclampsia.
Collapse
|
15
|
Soto-Pantoja DR, Kaur S, Roberts DD. CD47 signaling pathways controlling cellular differentiation and responses to stress. Crit Rev Biochem Mol Biol 2015; 50:212-30. [PMID: 25708195 DOI: 10.3109/10409238.2015.1014024] [Citation(s) in RCA: 100] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
CD47 is a widely expressed integral membrane protein that serves as the counter-receptor for the inhibitory phagocyte receptor signal-regulatory protein-α (SIRPα) and as a signaling receptor for the secreted matricellular protein thrombospondin-1. Recent studies employing mice and somatic cells lacking CD47 have revealed important pathophysiological functions of CD47 in cardiovascular homeostasis, immune regulation, resistance of cells and tissues to stress and chronic diseases of aging including cancer. With the emergence of experimental therapeutics targeting CD47, a more thorough understanding of CD47 signal transduction is essential. CD47 lacks a substantial cytoplasmic signaling domain, but several cytoplasmic binding partners have been identified, and lateral interactions of CD47 with other membrane receptors play important roles in mediating signaling resulting from the binding of thrombospondin-1. This review addresses recent advances in identifying the lateral binding partners, signal transduction pathways and downstream transcription networks regulated through CD47 in specific cell lineages. Major pathways regulated by CD47 signaling include calcium homeostasis, cyclic nucleotide signaling, nitric oxide and hydrogen sulfide biosynthesis and signaling and stem cell transcription factors. These pathways and other undefined proximal mediators of CD47 signaling regulate cell death and protective autophagy responses, mitochondrial biogenesis, cell adhesion and motility and stem cell self-renewal. Although thrombospondin-1 is the best characterized agonist of CD47, the potential roles of other members of the thrombospondin family, SIRPα and SIRPγ binding and homotypic CD47 interactions as agonists or antagonists of signaling through CD47 should also be considered.
Collapse
Affiliation(s)
- David R Soto-Pantoja
- a Laboratory of Pathology , Center for Cancer Research, National Cancer Institute, National Institutes of Health , Bethesda , MD , USA
| | | | | |
Collapse
|
16
|
Extracellular matrix proteins modulate antimigratory and apoptotic effects of Doxorubicin. CHEMOTHERAPY RESEARCH AND PRACTICE 2012; 2012:268681. [PMID: 22811904 PMCID: PMC3395309 DOI: 10.1155/2012/268681] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/03/2012] [Accepted: 04/30/2012] [Indexed: 01/13/2023]
Abstract
Anticancer drug resistance is a multifactorial process that includes acquired and de novo drug resistances. Acquired resistance develops during treatment, while de novo resistance is the primary way for tumor cells to escape chemotherapy. Tumor microenvironment has been recently shown to be one of the important factors contributing to de novo resistance and called environment-mediated drug resistance (EMDR). Two forms of EMDR have been described: soluble factor-mediated drug resistance (SFM-DR) and cell adhesion-mediated drug resistance (CAM-DR). Anthracyclines, among the most potent chemotherapeutic agents, are widely used in clinics against hematopoietic and solid tumors. Their main mechanism of action relies on the inhibition of topoisomerase I and/or II and the induction of apoptosis. Beyond this well-known antitumor activity, it has been recently demonstrated that anthracyclines may display potent anti-invasive effects when used at subtoxic concentrations. In this paper, we will describe two particular modes of EMDR by which microenvironment may influence tumor-cell response to one of these anthracyclines, doxorubicin. The first one considers the influence of type I collagen on the antimigratory effect of doxorubicin (CAM-DR). The second considers the protection of tumor cells by thrombospondin-I against doxorubicin-induced apoptosis (SFM-DR).
Collapse
|
17
|
Programmable multivalent display of receptor ligands using peptide nucleic acid nanoscaffolds. Nat Commun 2012; 3:614. [PMID: 22233624 PMCID: PMC3518395 DOI: 10.1038/ncomms1629] [Citation(s) in RCA: 89] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2011] [Accepted: 12/01/2011] [Indexed: 01/05/2023] Open
Abstract
Multivalent effects dictate the binding affinity of multiple ligands on one molecular entity to receptors. Integrins are receptors that mediate cell attachment through multivalent binding to peptide sequences within the extracellular matrix, and overexpression promotes the metastasis of some cancers. Multivalent display of integrin antagonists enhances their efficacy, but current scaffolds have limited ranges and precision for the display of ligands. Here we present an approach to studying multivalent effects across wide ranges of ligand number, density, and three-dimensional arrangement. Using L-lysine γ-substituted peptide nucleic acids, the multivalent effects of an integrin antagonist were examined over a range of 1-45 ligands. The optimal construct improves the inhibitory activity of the antagonist by two orders of magnitude against the binding of melanoma cells to the extracellular matrix in both in vitro and in vivo models.
Collapse
|
18
|
Kuo MW, Wang CH, Wu HC, Chang SJ, Chuang YJ. Soluble THSD7A is an N-glycoprotein that promotes endothelial cell migration and tube formation in angiogenesis. PLoS One 2011; 6:e29000. [PMID: 22194972 PMCID: PMC3237571 DOI: 10.1371/journal.pone.0029000] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2011] [Accepted: 11/18/2011] [Indexed: 12/19/2022] Open
Abstract
Background Thrombospondin type I domain containing 7A (THSD7A) is a novel neural protein that is known to affect endothelial migration and vascular patterning during development. To further understand the role of THSD7A in angiogenesis, we investigated the post-translational modification scheme of THS7DA and to reveal the underlying mechanisms by which this protein regulates blood vessel growth. Methodology/Principal Findings Full-length THSD7A was overexpressed in human embryonic kidney 293T (HEK293T) cells and was found to be membrane associated and N-glycosylated. The soluble form of THSD7A, which is released into the cultured medium, was harvested for further angiogenic assays. We found that soluble THSD7A promotes human umbilical vein endothelial cell (HUVEC) migration and tube formation. HUVEC sprouts and zebrafish subintestinal vessel (SIV) angiogenic assays further revealed that soluble THSD7A increases the number of branching points of new vessels. Interestingly, we found that soluble THSD7A increased the formation of filopodia in HUVEC. The distribution patterns of vinculin and phosphorylated focal adhesion kinase (FAK) were also affected, which implies a role for THSD7A in focal adhesion assembly. Moreover, soluble THSD7A increased FAK phosphorylation in HUVEC, suggesting that THSD7A is involved in regulating cytoskeleton reorganization. Conclusions/Significance Taken together, our results indicate that THSD7A is a membrane-associated N-glycoprotein with a soluble form. Soluble THSD7A promotes endothelial cell migration during angiogenesis via a FAK-dependent mechanism and thus may be a novel neuroangiogenic factor.
Collapse
Affiliation(s)
- Meng-Wei Kuo
- Department of Medical Science and Institute of Bioinformatics and Structural Biology, National Tsing Hua University, Hsinchu, Taiwan, Republic of China
| | - Chian-Huei Wang
- Department of Medical Science and Institute of Bioinformatics and Structural Biology, National Tsing Hua University, Hsinchu, Taiwan, Republic of China
| | - Hsiao-Chun Wu
- Department of Medical Science and Institute of Bioinformatics and Structural Biology, National Tsing Hua University, Hsinchu, Taiwan, Republic of China
| | - Shing-Jyh Chang
- Department of Obstetrics and Gynecology, Hsinchu Mackay Memorial Hospital, Hsinchu, Taiwan, Republic of China
| | - Yung-Jen Chuang
- Department of Medical Science and Institute of Bioinformatics and Structural Biology, National Tsing Hua University, Hsinchu, Taiwan, Republic of China
- * E-mail:
| |
Collapse
|
19
|
El Btaouri H, Morjani H, Greffe Y, Charpentier E, Martiny L. Role of JNK/ATF-2 pathway in inhibition of thrombospondin-1 (TSP-1) expression and apoptosis mediated by doxorubicin and camptothecin in FTC-133 cells. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2011; 1813:695-703. [PMID: 21333695 DOI: 10.1016/j.bbamcr.2011.02.004] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/17/2010] [Revised: 02/03/2011] [Accepted: 02/07/2011] [Indexed: 11/25/2022]
Abstract
Our previous studies have shown that camptothecin and doxorubicin triggered ceramide accumulation via de novo synthesis pathway. De novo ceramide generation was responsible for the drug-induced apoptosis through a caspase-3-dependent pathway and a decrease of thrombospondin-1 expression in human thyroid carcinoma FTC-133 cells. Here, we demonstrate that Jun N-terminal kinases play a critical role in camptothecin- and doxorubicin-induced down-regulation of thrombospondin-1 expression: i) de novo ceramide synthesis pathway activates Jun N-terminal kinase 1/2 resulting in activating transcription factor 2 phosphorylation; ii) cell treatment by SP600125, a Jun N-terminal kinase specific inhibitor, strongly reduced activating transcription factor 2 phosphorylation and completely abolished camptothecin and doxorubicin effects; and iii) activating transcription factor 2 expression silencing greatly attenuated camptothecin- and doxorubicin-induced down-regulation of thrombospondin-1 expression and apoptosis. The set of our data established that camptothecin- and doxorubicin-induced activation of Jun N-terminal kinase/activating transcription factor 2 pathway via de novo ceramide synthesis down-regulates thrombospondin-1 expression and apoptosis in human thyroid carcinoma FTC-133 cells. This article is part of a Special Issue entitled: 11th European Symposium on Calcium.
Collapse
Affiliation(s)
- Hassan El Btaouri
- Laboratoire SiRMa (Signalisation Cellulaire et Récepteurs Matriciels), UMR-CNRS 6237, UFR Sciences, Reims, France.
| | | | | | | | | |
Collapse
|
20
|
Wang CH, Su PT, Du XY, Kuo MW, Lin CY, Yang CC, Chan HS, Chang SJ, Kuo C, Seo K, Leung LL, Chuang YJ. Thrombospondin type I domain containing 7A (THSD7A) mediates endothelial cell migration and tube formation. J Cell Physiol 2010; 222:685-94. [PMID: 20020485 DOI: 10.1002/jcp.21990] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
Angiogenesis is a highly organized process controlled by a series of molecular events. While much effort has been devoted to identifying angiogenic factors and their reciprocal receptors, far less information is available on the molecular mechanisms underlying directed endothelial cell migration. To search for novel proteins that participate in this process, we used the serial analysis of gene expression (SAGE) transcript profiling approach to identify genes that are selectively expressed in endothelial cells (ECs). Two EC SAGE libraries were constructed from human umbilical vein and artery ECs to enable data-mining against other non-ECs. A novel endothelial protein, Thrombospondin Type I Domain Containing 7A (THSD7A), with preferential expression in placenta vasculature and in human umbilical vein endothelial cells (HUVECs) was identified and targeted for further characterization. Overexpression of a THSD7A carboxyl-terminal fragment in HUVECs inhibited cell migration and disrupted tube formation, while suppression of THSD7A expression enhanced HUVEC migration and tube formation. Immunohistological analysis revealed that THSD7A was expressed at the leading edge of migrating HUVECs, and it co-localized with alpha(V)beta(3) integrin and paxillin. This distribution was dispersed from focal adhesions after disruption of the actin cytoskeleton, suggesting the involvement of THSD7A in cytoskeletal organization. Our results show that THSD7A is a novel placenta endothelial protein that mediates EC migration and tube formation, and they highlight its potential as a new target for anti-angiogenic therapy.
Collapse
Affiliation(s)
- Chieh-Huei Wang
- Department of Life Science, Institute of Bioinformatics and Structural Biology, National Tsing Hua University, Hsinchu, 30013 Taiwan, ROC
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
21
|
Jin G, Tsuji K, Xing C, Yang YG, Wang X, Lo EH. CD47 gene knockout protects against transient focal cerebral ischemia in mice. Exp Neurol 2009; 217:165-70. [PMID: 19233173 DOI: 10.1016/j.expneurol.2009.02.004] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2008] [Revised: 01/16/2009] [Accepted: 02/04/2009] [Indexed: 11/29/2022]
Abstract
CD47 is a cell surface glycoprotein that helps mediate neutrophil transmigration across blood vessels. The present study was performed to determine whether absence of the CD47 gene decreases focal ischemic brain damage. Mice were subjected to 90 min middle cerebral artery occlusion. CD47 knockout mice were compared against matching wildtype mice. CD47 expression was checked by Western blotting. Infarct volume and ischemic brain swelling were quantified with cresyl violet-stained brain sections at 24 and 72 h after ischemia. The tight junction protein claudin-5 was detected by imunohistochemistry. Two surrogate markers of neuroinflammation, brain levels of matrix metalloproteinase-9 (MMP-9) and infiltration of neutrophils, were assessed by immunohistochemistry. Western blots confirmed that CD47 was absent in knockout brains. Ischemia did not appear to upregulate total brain levels of CD47 in WT mice. In CD47 knockout mice, infarct volumes were reduced at 24 and 72 h after ischemia, and hemispheric swelling was decreased at 72 h. Loss of claudin-5 was observed in ischemic WT brain. This effect was ameliorated in CD47 knockout brains. Extravasation of neutrophils into the brain parenchyma was significantly reduced in CD47 knockout mice compared to wildtype mice. MMP-9 appeared to be upregulated in microvessels within ischemic brain. MMP-9 levels were markedly lower in CD47 knockout brains compared to wildtype brains. We conclude that CD47 is broadly involved in neuroinflammation, and this integrin-associated-protein plays a role in promoting MMP-9 upregulaton, neutrophil extravasation, brain swelling and progression of acute ischemic brain injury.
Collapse
Affiliation(s)
- Guang Jin
- Department of Radiology and Neurology, Neuroprotection Research Laboratory, Massachusetts General Hospital, Harvard Medical School, Massachusetts 02129, USA
| | | | | | | | | | | |
Collapse
|
22
|
Isenberg JS, Frazier WA, Roberts DD. Thrombospondin-1: a physiological regulator of nitric oxide signaling. Cell Mol Life Sci 2008; 65:728-42. [PMID: 18193160 PMCID: PMC2562780 DOI: 10.1007/s00018-007-7488-x] [Citation(s) in RCA: 97] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Thrombospondin-1 is a secreted protein that modulates vascular cell behavior via several cell surface receptors. In vitro, nanomolar concentrations of thrombospondin-1 are required to alter endothelial and vascular smooth muscle cell adhesion, proliferation, motility, and survival. Yet, much lower levels of thrombospondin-1 are clearly functional in vivo. This discrepancy was explained with the discovery that the potency of thrombospondin-1 increases more than 100-fold in the presence of physiological levels of nitric oxide (NO). Thrombospondin-1 binding to CD47 inhibits NO signaling by preventing cGMP synthesis and activation of its target cGMP-dependent protein kinase. This potent antagonism of NO signaling allows thrombospondin-1 to acutely constrict blood vessels, accelerate platelet aggregation, and if sustained, inhibit angiogenic responses. Acute antagonism of NO signaling by thrombospondin-1 is important for hemostasis but becomes detrimental for tissue survival of ischemic injuries. New therapeutic approaches targeting thrombospondin-1 or CD47 can improve recovery from ischemic injuries and overcome a deficit in NO-responsiveness in aging. (Part of a Multi-author Review).
Collapse
Affiliation(s)
- J. S. Isenberg
- Laboratory of Pathology, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Building 10, Room 2A33, 10 Center Dr MSC1500, Bethesda, Maryland 20892 USA
| | - W. A. Frazier
- Department of Biochemistry and Molecular Biophysics, Washington University School of Medicine, St. Louis, Missouri 63110 USA
| | - D. D. Roberts
- Laboratory of Pathology, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Building 10, Room 2A33, 10 Center Dr MSC1500, Bethesda, Maryland 20892 USA
| |
Collapse
|
23
|
Abumrad NA, Ajmal M, Pothakos K, Robinson JK. CD36 expression and brain function: does CD36 deficiency impact learning ability? Prostaglandins Other Lipid Mediat 2005; 77:77-83. [PMID: 16099393 DOI: 10.1016/j.prostaglandins.2004.09.012] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2004] [Accepted: 09/14/2004] [Indexed: 11/29/2022]
Abstract
This article first presents an overview of published literature documenting the role of the scavenger receptor CD36 in activation of brain microglia with reference to brain pathologies such as Alzheimer's and malaria. Second, the possibility that CD36 may play a role in brain FA metabolism is discussed. Long-chain polyunsaturated fatty acids (PUFAs) are important for brain function and are mostly derived from the plasma. Based on its role in facilitating FA uptake in several tissues and cell types, CD36 expressed on microvascular endothelial cells in the brain may facilitate local uptake of PUFAs. Alternatively, CD36 may influence brain FA supply indirectly via impacting utilization of dietary FA or their metabolism in tissues such as the liver. We examined the possibility that CD36 expression impacts brain function by evaluating the behavior of CD36 null mice using a battery of standard tests. Our data indicate that CD36 deficient mice have normal patterns of activity, anxiety and exploration of novel environments. However they appear to have a significant impairment in learning ability. These findings could provide a new perspective regarding the regulation of brain lipid metabolism.
Collapse
Affiliation(s)
- Nada A Abumrad
- Department of Physiology, Biophysics and Psychology, Stony Brook University, NY 11794, USA.
| | | | | | | |
Collapse
|
24
|
Bhattacharya G, Cosgrove D. Evidence for Functional Importance of Usherin/Fibronectin Interactions in Retinal Basement Membranes. Biochemistry 2005; 44:11518-24. [PMID: 16114888 DOI: 10.1021/bi050245u] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Usher syndrome is a genetically heterogeneous disorder characterized by hearing loss with retinitis pigmentosa. Usher syndrome type IIa is the most common of the Usher syndromes, accounting for over half of all cases. The gene encodes a 180 kDa basement membrane glycoprotein called usherin. Here, we demonstrated a specific interaction between usherin and fibronectin in retinal basement membranes. This interaction was confirmed using biochemical, biophysical, and genetic approaches. Surface plasmon resonance assay confirmed that fibronectin binding to usherin is of high affinity and 1:1 stoichiometry. Using a fusion peptide-based co-immunoprecipitation approach, we show that binding to fibronectin occurs at the LE domain of usherin. Recombinant LE domain-specific peptides were engineered that contained single amino acid substitutions corresponding to missense mutations found in humans with Usher syndrome type IIa. Only mutations in loop d of the LE domain abolished the ability of the LE domain to co-immunoprecipitate fibronectin.
Collapse
Affiliation(s)
- Gautam Bhattacharya
- Usher Syndrome Center, Boys Town National Research Hospital, 555 North 30th Street, Omaha, Nebraska 68131, USA
| | | |
Collapse
|
25
|
Zhang L, Yamane T, Satoh E, Amagasaki K, Kawataki T, Asahara T, Furuya K, Nukui H, Naganuma H. Establishment and partial characterization of five malignant glioma cell lines. Neuropathology 2005; 25:136-43. [PMID: 15875906 DOI: 10.1111/j.1440-1789.2005.00601.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Five malignant glioma cell lines (YMG1, 2, 3, 4, and 5) were established from surgical specimens obtained from patients with glioblastoma or anaplastic astrocytoma, and these lines were partially characterized. Three glioma cell lines (YMG1, 3, and 5) were weakly positive for GFAP by Western blot analysis and two cell lines were negative. S-100 protein was positive in all glioma cell lines. The expression of p53, p16, p15, cyclin-dependent kinase 4 (CDK4), and EGF receptor (EGFR) proteins was examined by Western blotting. YMG1 and 2 cell lines showed accumulation of p53 protein and loss of p16 and p15 expression. YMG3 and 4 showed accumulation of p53 protein and expression of p16 and p15 proteins. YMG5 revealed weak expression of p53 protein, suggesting wild-type p53, and loss of p16 and p15 expression. All cell lines expressed various levels of CDK4 protein. YMG1, 2, and 3 showed higher EGFR protein expression and YMG4 and 5 showed lower EGFR expression compared to U251 glioblastoma cells, which express high levels of EGFR. Fluorescence in situ hybridization analysis for EGFR gene expression did not show any amplification in the glioma cell lines. Immunohistochemical studies revealed that the patterns of p53 and EGFR expressions in the original tumor tissues were mostly correlated with those in the malignant glioma cell lines. These results suggest that the characteristics of p53 and EGFR expression in the malignant glioma cell lines were passed over from the original tumor tissues. These newly established malignant glioma cell lines can be used for further analysis of the mechanisms of tumor growth and progression.
Collapse
Affiliation(s)
- Lei Zhang
- Department of Neurosurgery, University of Yamanashi Faculty of Medicine, Yamanashi, Japan
| | | | | | | | | | | | | | | | | |
Collapse
|
26
|
Zhang L, Mabuchi T, Satoh E, Maeda S, Nukui H, Naganuma H. Overexpression of heparin-binding growth-associated molecule in malignant glioma cells. Neurol Med Chir (Tokyo) 2005; 44:637-43; discussion 644-5. [PMID: 15684595 DOI: 10.2176/nmc.44.637] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The highly invasive and angiogenic characteristics of malignant gliomas depend on the production of growth factors and angiogenic factors. Heparin-binding growth-associated molecule (HB-GAM) is a secreted growth factor that is mitogenic for endothelial cells. To examine the expression profile of HB-GAM in malignant glioma cells, messenger ribonucleic acid (mRNA) expression was analyzed in 10 malignant glioma cell lines, two glioblastoma tissue specimens, and two normal brain tissue specimens by the reverse transcription-polymerase chain reaction. HB-GAM mRNA was expressed in all specimens including normal brain tissue specimens. Western blot analysis revealed that HB-GAM protein contents in glioma cell lines and glioblastoma tissues were 1.8 to 6.3 times higher than those in normal brain tissues. The effect of neutralizing anti-platelet-derived growth factor (PDGF) antibody was also examined on the production of HB-GAM in malignant glioma cells, since malignant glioma cells secrete PDGF that upregulates HB-GAM expression. Treatment of U251 and T98G glioblastoma cells with the anti-PDGF antibody did not affect the HB-GAM production. These results suggest that HB-GAM is overexpressed in malignant glioma cells and is involved in tumor growth.
Collapse
Affiliation(s)
- Lei Zhang
- Department of Neurosurgery, University of Yamanashi, Faculty of Medicine, Yamanashi, Japan
| | | | | | | | | | | |
Collapse
|
27
|
Naganuma H, Satoh E, Asahara T, Amagasaki K, Watanabe A, Satoh H, Kuroda K, Zhang L, Nukui H. Quantification of thrombospondin-1 secretion and expression of alphavbeta3 and alpha3beta1 integrins and syndecan-1 as cell-surface receptors for thrombospondin-1 in malignant glioma cells. J Neurooncol 2005; 70:309-17. [PMID: 15662972 DOI: 10.1007/s11060-004-9167-1] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
Malignant glioma cells secrete thrombospondin-1 (TSP-1) which participates in the motility of glioma cells, and binds to cell surface alphavbeta3 and alpha3beta1 integrins, and syndecan-1. This study evaluated the amount of TSP-1 secretion from malignant glioma cells, and the expression of alphavbeta3 and alpha3beta1 integrins, and syndecan-1. The amounts of TSP-1 in the supernatants from 10 malignant glioma cell lines and eight non-glioma malignant tumor cell lines were measured by enzyme-linked immunosorbent assay. Expression of alphavbeta3 and alpha3beta1 integrins, and syndecan-1 were examined by flow cytometry. The amounts of TSP-1 secreted by malignant glioma cells were 43 to 2431 ng/l x 10(6) cells/24 h (mean +/- SD = 626 +/- 792). Seven of 10 glioma cell lines secreted more than 100 ng of TSP-1 and three of these cell lines secreted more than 1 microg. Seven of eight non-glioma cell lines secreted less than 100 ng of TSP-1. All glioma cell lines expressed alpha3beta1 integrin and syndecan-1, and seven of 10 glioma cell lines expressed alphavbeta3 integrin. Treatment of the glioma cell lines with TGF-beta2 did not change the expression of alphavbeta3 integrin. These results suggest that malignant glioma cells secrete high levels of TSP-1, which may be important in the migration of glioma cells via interactions with alphavbeta3 and alpha3beta1 integrins, and syndecan-1.
Collapse
Affiliation(s)
- Hirofumi Naganuma
- Department of Neurosurgery, University of Yamanashi Faculty of Medicine, Nakakoma-gun, Yamanashi, Japan.
| | | | | | | | | | | | | | | | | |
Collapse
|
28
|
Wu Y, Singh S, Georgescu MM, Birge RB. A role for Mer tyrosine kinase in αvβ5 integrin-mediated phagocytosis of apoptotic cells. J Cell Sci 2005; 118:539-53. [PMID: 15673687 DOI: 10.1242/jcs.01632] [Citation(s) in RCA: 194] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Efficient phagocytosis of apoptotic cells is crucial for many cellular processes. One of earliest signals to the phagocyte is the expression of phosphatidylserine (PS) on the outer surface of the apoptotic cell that provides a potent `eat-me' signal. Recognition of PS occurs either directly, via PS receptor (PS-R), or indirectly via αvβ5(3) integrin or Mer-family tyrosine kinases through the opsonizing proteins milk fat globule-EGF factor 8 protein (MFG-E8), or growth arrest specific factor-6 (Gas6), respectively. Because Mer and αvβ5 integrin share PS-dependent recognition signals, we investigated their post-receptor signaling cascades following receptor activation. Using a constitutively active form for Mer (CDMer) or Gas6 as a ligand to stimulate Mer, we found that Mer activation induced a post-receptor signaling cascade involving Src-mediated tyrosine phosphorylation of FAK on Tyr861, the recruitment of FAKTyr861 to the αvβ5 integrin, and increased formation of p130CAS/CrkII/Dock180 complex to activate Rac1. Coexpression of Mer with αvβ5 integrin had a synergistic effect on Rac1 activation, lamellipodial formation and the phagocytosis of apoptotic cells. Interestingly, Gas6 or CDMer failed to stimulate p130CAS tyrosine phosphorylation or phagocytosis in β5-deficient CS-1 cells or in mutant β5ΔC-expressing cells, suggesting that Mer is directionally and functionally linked to the integrin pathway. The present data indicate that receptors that recognize apoptotic cells in the context of PS functionally crosstalk to amplify intracellular signals to internalize apoptotic cells. Moreover, our data link another PS-dependent signal to the CrkII/Dock180/Rac1 module.
Collapse
Affiliation(s)
- Yi Wu
- Department of Biochemistry and Molecular Biology, UMDNJ-New Jersey Medical School, 185 South Orange Avenue, Newark, NJ 07103, USA
| | | | | | | |
Collapse
|
29
|
Moralez AM, Maile LA, Clarke J, Busby WH, Clemmons DR. Insulin-like growth factor binding protein-5 (IGFBP-5) interacts with thrombospondin-1 to induce negative regulatory effects on IGF-I actions. J Cell Physiol 2005; 203:328-34. [PMID: 15700281 DOI: 10.1002/jcp.20343] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Insulin-like growth factor binding protein-5 (IGFBP-5) and thrombospondin-1 (TS-1) are both present in extracellular matrix (ECM). Both proteins have been shown to bind to one another with high affinity. The purpose of these studies was to determine how the interaction between IGFBP-5 and TS-1 modulates IGF-I actions in porcine aortic smooth muscle cells (pSMC) in culture. The addition of increasing concentrations of TS-1 to pSMC cultures enhanced the protein synthesis and cell migration responses to IGF-I; whereas the addition of IGFBP-5 alone resulted in minimal changes. In contrast, the addition of IGFBP-5 to cultures that were also exposed to IGF-I and TS-1 resulted in inhibition of protein synthesis. When the cell migration response was assessed, the response to IGF-I plus TS-1 was also significantly inhibited by the addition of IGFBP-5, whereas 1.0 microg/ml of IGFBP-5 alone had no effect on the response to IGF-I. To determine the molecular mechanism by which this inhibition occurred, a mutant form of IGFBP-5 that does not bind to IGF-I was tested. This mutant was equipotent compared to native IGFBP-5 in its ability to inhibit both protein synthesis and cell migration responses to IGF-I plus TS-1 thus excluding the possibility that IGFBP-5 was inhibiting the response to TS-1 and IGF-I by inhibiting IGF-I binding to the IGF-I receptor. To determine if an interaction between TS-1 and IGFBP-5 was the primary determinant of the inhibitory effect of IGFBP-5, an IGFBP-5 mutant that bound poorly to TS-1 was utilized. The addition of 1.0 microg/ml of this mutant did not inhibit the protein synthesis or cell migration responses to IGF-I plus TS-1. To determine the mechanism by which IGFBP-5 binding to TS-1 inhibited cellular responses to TS-1 plus IGF-I, TS-1 binding to integrin associated protein (IAP) was assessed. The addition of IGFBP-5 (1.0 microg/ml) inhibited TS-1-IAP association. In contrast, a mutant form of IGFBP-5 that bound poorly to TS-1 had a minimal effect on TS-1 binding to IAP. Further analysis showed that IGFBP-5 addition altered the ability of TS-1 to modulate the SHPS-1/IAP interaction. When the IGFBP-5 mutant that did not bind to IGF-I was incubated with TS-1 and IGF-I, it inhibited the capacity of TS-1 to enhance the IGF-I receptor phosphorylation and MAP kinase activation in response to IGF-I. In contrast, the IGFBP-5 mutant that did not bind to TS-1 had no effect on IGF-I stimulated IGF-I receptor phosphorylation or MAP kinase activation. These results indicate that IGFBP-5 inhibits the binding of TS-1 to IAP, and this results in an alteration of the ability of TS-1 to modulate the disruption of the IAP/SHPS-1 interaction which leads to attenuation of the ability of TS-1 to enhance cellular responsiveness to IGF-I.
Collapse
MESH Headings
- Animals
- Antigens, CD/metabolism
- Antigens, Differentiation/metabolism
- CD47 Antigen
- Cell Movement/drug effects
- Cell Movement/physiology
- Cells, Cultured
- Dose-Response Relationship, Drug
- Down-Regulation/drug effects
- Down-Regulation/physiology
- Insulin-Like Growth Factor Binding Protein 5/metabolism
- Insulin-Like Growth Factor Binding Protein 5/pharmacology
- Insulin-Like Growth Factor I/antagonists & inhibitors
- Insulin-Like Growth Factor I/metabolism
- Integrin alphaVbeta3/drug effects
- Integrin alphaVbeta3/metabolism
- MAP Kinase Signaling System/drug effects
- MAP Kinase Signaling System/physiology
- Membrane Glycoproteins/metabolism
- Muscle, Smooth, Vascular/drug effects
- Muscle, Smooth, Vascular/metabolism
- Mutation/genetics
- Neural Cell Adhesion Molecule L1/metabolism
- Phosphorylation/drug effects
- Protein Binding/physiology
- Receptor, IGF Type 1/metabolism
- Receptors, Immunologic/metabolism
- Sus scrofa
- Thrombospondin 1/metabolism
- Thrombospondin 1/pharmacology
Collapse
Affiliation(s)
- Anna M Moralez
- Department of Medicine, University of North Carolina, School of Medicine, Chapel Hill, NC 27599, USA
| | | | | | | | | |
Collapse
|
30
|
Sakamoto S, Yokoyama M, Aoki M, Suzuki K, Kakehi Y, Saito Y. Induction and function of CYR61 (CCN1) in prostatic stromal and epithelial cells: CYR61 is required for prostatic cell proliferation. Prostate 2004; 61:305-17. [PMID: 15389821 DOI: 10.1002/pros.20098] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
BACKGROUND CYR61 is an extracellular matrix-associated protein that promotes adhesion, migration, and proliferation of endothelial cells and fibroblasts. Prostate enlargement, which frequently causes the urethral compression, is often histologically observed as stromal and epithelial hyperplasia in an enlarged gland. To determine whether or not CYR61 has relevance to the progression of benign prostatic hyperplasia (BPH), we investigated the induction of CYR61, and also examined its function in both prostatic stromal and epithelial cells. METHODS Recombinant CYR61 protein was used for the examination of the activity of CYR61 as to cell adhesion and proliferation. Quantitative reverse transcription-polymerase chain reaction (RT-PCR) was utilized to screen for inducers of the CYR61 gene in prostatic cells. Finally, the effects of an anti-sense oligonucleotide, which could reduce the production of CYR61, on the morphology and growth of prostatic cells were also examined. RESULTS Recombinant CYR61 protein promotes prostatic cell adhesion and proliferation. The mRNA for CYR61, a growth factor-inducible immediate early gene, was markedly induced by fetal bovine serum (FBS) within 1 hr, and strongly induced by transforming growth factor-beta1 (TGF-beta) for at least 19 hr following stimulation. The suppression of CYR61 production with an anti-sense oligonucleotide causes obvious morphological changes of prostatic cells. Furthermore, we have shown that CYR61 is necessary, at least in part, for FBS-induced prostatic cell proliferation, because dramatic inhibition of cellular growth was caused by the suppression of CYR61 production with the addition of the anti-sense oligonucleotide before FBS stimulation. CONCLUSIONS In this study, we demonstrate that serum growth factors induce the CYR61 gene in both stromal and epithelial cells, and that CYR61 plays functional roles in cell adhesion, morphology, and proliferation, supporting its involvement in benign prostatic enlargement. These results strongly suggest that CYR61 is a key molecule, and therefore could be a potential therapeutic target in prostatic hyperplastic growth.
Collapse
Affiliation(s)
- Shinji Sakamoto
- Pharmaceutical Frontier Research Laboratories, JT Inc., Yokohama City, Japan.
| | | | | | | | | | | |
Collapse
|
31
|
Sid B, Sartelet H, Bellon G, El Btaouri H, Rath G, Delorme N, Haye B, Martiny L. Thrombospondin 1: a multifunctional protein implicated in the regulation of tumor growth. Crit Rev Oncol Hematol 2004; 49:245-58. [PMID: 15036264 DOI: 10.1016/j.critrevonc.2003.09.009] [Citation(s) in RCA: 77] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/19/2003] [Indexed: 10/26/2022] Open
Abstract
Thrombospondins belong to a family of extracellular matrix (ECM) proteins widely found from embryonic to adult tissues. The modular structure of thrombospondins contains a series of peptide sequences implicated in a multiplicity of biological functions. Extracellular matrix undergoes important alterations under proteolysis that occurs in pathological processes like tumorigenesis. An elevated secretion of thrombospondin 1 (TSP1) is often observed in tumors and is sometimes considered as a predictive factor. However, the role of TSP1 in cancer progression remains controversial and must be carefully apprehended. The regulation of cell adhesion, proliferation, apoptosis by TSP1 is examined in the present review and it is clear from the literature and from our investigations that TSP1 presents both stimulatory and inhibitory effects. The exposition of cryptic sites upon conformational changes can partially explain this contradiction. More interestingly, the analysis of TSP1-directed intracellular signaling pathways activated through specific receptors or supramolecular receptors docking systems may be useful to discriminate the precise function of TSP1 in tumor progression. The central role played by TSP1 in the control of matrix-degrading enzyme activation and catabolism reveals attractive tracks of research and highlights the involvement of the lipoprotein receptor-related protein (LRP) receptor in these events. Therefore, TSP1-derived peptides constitute a source of potentially active matrikins which could provide essential tools in cancer therapy.
Collapse
Affiliation(s)
- B Sid
- Laboratoire de Biochimie, UFR Sciences de Reims, FRE-CNRS 2534, IFR 53 "Biomolécules", Moulin de la housse BP1039, 51687 Reims Cedex 2, France
| | | | | | | | | | | | | | | |
Collapse
|
32
|
Calzada MJ, Annis DS, Zeng B, Marcinkiewicz C, Banas B, Lawler J, Mosher DF, Roberts DD. Identification of novel beta1 integrin binding sites in the type 1 and type 2 repeats of thrombospondin-1. J Biol Chem 2004; 279:41734-43. [PMID: 15292271 DOI: 10.1074/jbc.m406267200] [Citation(s) in RCA: 69] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
In addition to the three known beta(1) integrin recognition sites in the N-module of thrombospondin-1 (TSP1), we found that beta(1) integrins mediate cell adhesion to the type 1 and type 2 repeats. The type 1 repeats of TSP1 differ from typical integrin ligands in that recognition is pan-beta(1)-specific. Adhesion of cells that express one dominant beta(1) integrin on immobilized type 1 repeats is specifically inhibited by antagonists of that integrin, whereas adhesion of cells that express several beta(1) integrins is partially inhibited by each alpha-subunit-specific antagonist and completely inhibited by combining the antagonists. beta(1) integrins recognize both the second and third type 1 repeats, and each type 1 repeat shows pan-beta(1) specificity and divalent cation dependence for promoting cell adhesion. Adhesion to the type 2 repeats is less sensitive to alpha-subunit antagonists, but a beta(1) blocking antibody and two disintegrins inhibit adhesion to immobilized type 2 repeats. beta(1) integrin expression is necessary for cell adhesion to the type 1 or type 2 repeats, and beta(1) integrins bind in a divalent cation-dependent manner to a type 1 repeat affinity column. The widely used TSP1 function blocking antibody A4.1 binds to a site in the third type 2 repeat. A4.1 proximally inhibits beta(1) integrin-dependent adhesion to the type 2 repeats and indirectly inhibits integrin-dependent adhesion mediated by the TSP1 type 1 repeats. Although antibody A4.1 is also an antagonist of CD36 binding to TSP1, these data suggest that some biological activities of A4.1 result from antagonism of these novel beta(1) integrin binding sites.
Collapse
Affiliation(s)
- Maria J Calzada
- Laboratory of Pathology, NCI, National Institutes of Health, Bethesda, Maryland 20892-1500, USA
| | | | | | | | | | | | | | | |
Collapse
|
33
|
Bhattacharya G, Kalluri R, Orten DJ, Kimberling WJ, Cosgrove D. A domain-specific usherin/collagen IV interaction may be required for stable integration into the basement membrane superstructure. J Cell Sci 2004; 117:233-42. [PMID: 14676276 DOI: 10.1242/jcs.00850] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Usherin is a basement membrane protein encoded by the gene associated with Usher syndrome type IIa, the most common deaf/blind disorder. This report demonstrates a specific interaction between type IV collagen and usherin in the basement membrane, with a 1:1 stoichiometry for binding. Genetic and biochemical approaches were used to explore the role of type IV collagen binding in usherin function. We demonstrate binding occurs between the LE domain of usherin and the 7S domain of type IV collagen. A purified fusion peptide comprising the first four LE modules was shown to compete with full-length recombinant usherin for type IV collagen binding. However, synonymous fusion peptides with single amino acid substitutions resulting from missense mutations that were known to cause Usher syndrome type IIa in humans, failed to compete. Only mutations in loop b of the LE domain abolished binding activity. Co-immunoprecipitation and western blot analysis of testicular basement membranes from the Alport mouse model show a 70% reduction in type IV collagen is associated with a similar reduction in usherin, suggesting the usherin/collagen (IV) interaction stabilizes usherin in the basement membrane. Thus, the domain-specific interaction between usherin and type IV collagen appears essential to usherin stability in vivo, and loss of this interaction may result in Usher pathology in humans.
Collapse
Affiliation(s)
- Gautam Bhattacharya
- Usher Syndrome Center, Boys Town National Research Hospital, 555 No. 30th Street, Omaha, Nebraska, 68131, USA
| | | | | | | | | |
Collapse
|
34
|
Akakura S, Singh S, Spataro M, Akakura R, Kim JI, Albert ML, Birge RB. The opsonin MFG-E8 is a ligand for the alphavbeta5 integrin and triggers DOCK180-dependent Rac1 activation for the phagocytosis of apoptotic cells. Exp Cell Res 2004; 292:403-16. [PMID: 14697347 DOI: 10.1016/j.yexcr.2003.09.011] [Citation(s) in RCA: 136] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Opsonization of apoptotic cells facilitates recognition by phagocytes for the rapid clearance of potentially inflammatory cellular material. The secreted glycoprotein Milk Fat Globule Factor-E8 (MFG-E8) is a member of this family of bridging molecules and is believed to bind phosphatidylserine (PS) on the dying cell, linking it to integrin receptors on the phagocyte. Here we report the characterization of a functional signaling module involving MFG-E8, alphavbeta5 integrin, and DOCK180 for the activation of Rac1. We show that MFG-E8 and DOCK180 are both expressed in phagocytic-competent primary immature dendritic cells (DCs) and DC2.4 cells, and are potently down-regulated upon DC maturation, consistent with their role in phagocytosis and antigen capture. Coexpression of MFG-E8 with alphavbeta5 integrin potentiated integrin-mediated Rac1 activation, which was abrogated by mutagenesis in the RGD motif in MFG-E8. Moreover, expression of antisense DOCK180 abrogated MFG-E8-alphavbeta5-mediated Rac activation and impaired the phagocytosis of apoptotic cells. These data demonstrate a biochemical link between an opsonin of apoptotic cells, the alphavbeta5 integrin, and the Crk-DOCK180-Rac1 pathway, and importantly, show that MFG-E8 and DOCK180 are expressed according to the functional status of the phagocyte.
Collapse
Affiliation(s)
- Shin Akakura
- Department of Biochemistry and Molecular Biology, UMDNJ-New Jersey Medical School, 07103, Newark, NJ, USA
| | | | | | | | | | | | | |
Collapse
|
35
|
McDonald JF, Dimitry JM, Frazier WA. An amyloid-like C-terminal domain of thrombospondin-1 displays CD47 agonist activity requiring both VVM motifs. Biochemistry 2003; 42:10001-11. [PMID: 12924949 DOI: 10.1021/bi0341408] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Two VVM-containing peptides in the C-terminal domain (CBD) of thrombospondin-1 function as CD47 agonists. A recombinant form of the CBD (rCBD) has been expressed that contains both VVM sites and exhibits CD47-dependent binding of C32 melanoma cells when coated at concentrations 100x lower than the peptide 4N1K (kRFYVVMWKk). Circular dichroism and thioflavin T binding of a recombinant form of the C-terminal domain (rCBD) of thrombospondin-1 indicated a species highly enriched in beta-sheet secondary structure, with spectra similar to those of amyloid proteins. Reduction of the CD signal with progressively higher concentrations of guanidine hydrochloride was correlated with a loss of cell-binding activity. Melanoma cell spreading on vitronectin was strongly stimulated by immobilized rCBD co-coated at concentrations more than 50x lower than 4N1K, and the effect was blocked by treatment with pertussis toxin, consistent with the known mediation of CD47 signaling by trimeric G(i). Mutations of either or both VV sequences of rCBD (1037-38 and 1123-24 of TSP1) to GG had a modest effect on cell binding, a component of which was inhibited by heparin. However, all three mutants dramatically reduced the signaling-dependent stimulation of cell spreading, indicating that the VVM motifs of rCBD are structurally linked in CD47 activation.
Collapse
Affiliation(s)
- J F McDonald
- Department of Biochemistry and Molecular Biophysics, Washington University School of Medicine, Box 8231, 660 South Euclid Avenue, St. Louis, Missouri 63110, USA
| | | | | |
Collapse
|
36
|
Barazi HO, Li Z, Cashel JA, Krutzsch HC, Annis DS, Mosher DF, Roberts DD. Regulation of integrin function by CD47 ligands. Differential effects on alpha vbeta 3 and alpha 4beta1 integrin-mediated adhesion. J Biol Chem 2002; 277:42859-66. [PMID: 12218055 DOI: 10.1074/jbc.m206849200] [Citation(s) in RCA: 71] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
We examined the regulation of alpha4beta1 integrin function in melanoma cells and T cells by ligands of CD47. A CD47 antibody (B6H12) that inhibited alphavbeta3-mediated adhesion of melanoma cells induced by CD47-binding peptides from thrombospondin-1 directly stimulated alpha4beta1-mediated adhesion of the same cells to vascular cell adhesion molecule-1 and N-terminal regions of thrombospondin-1 or thrombospondin-2. B6H12 also stimulated alpha4beta1- as well as alpha2beta1- and alpha5beta1-mediated adhesion of CD47-expressing T cells but not of CD47-deficient T cells. alpha4beta1 and CD47 co-purified as a detergent-stable complex on a CD47 antibody affinity column. CD47-binding peptides based on C-terminal sequences of thrombospondin-1 also specifically enhanced adhesion of melanoma cells and T cells to alpha4beta1 ligands. Unexpectedly, activation of alpha4beta1 function by the thrombospondin-1 CD47-binding peptides also occurred in CD47-deficient T cells. CD47-independent activation of alpha4beta1 required the Val-Val-Met (VVM) motif of the peptides and was sensitive to inhibition by pertussis toxin. These results indicate that activation of alpha4beta1 by the CD47 antibody B6H12 and by VVM peptides occurs by different mechanisms. The antibody directly activates a CD47-alpha4beta1 complex, whereas VVM peptides may target an unidentified Gi-linked receptor that regulates alpha4beta1.
Collapse
Affiliation(s)
- Heba O Barazi
- Laboratory of Pathology, NCI, National Institutes of Health, Bethesda, Maryland 20892, USA
| | | | | | | | | | | | | |
Collapse
|
37
|
Shahein YEA, de Andrés DF, Pérez de la Lastra JM. Molecular cloning and functional characterization of the pig homologue of integrin-associated protein (IAP/CD47). Immunology 2002; 106:564-76. [PMID: 12153520 PMCID: PMC1782751 DOI: 10.1046/j.1365-2567.2002.01465.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
We report the cloning of cDNA encoding the pig homologue of human integrin-associated protein (IAP or CD47). A pig CD47-specific probe was generated by polymerase chain reaction (PCR) amplification of pig leucocyte cDNA, using primers based on consensus regions among the known sequences of CD47 from different species. Screening of a pig aorta smooth muscle cDNA library identified seven clones, all containing identical sequences. The clones contained an open reading frame (ORF) that encoded an 18 amino acid putative signal peptide, a 122 amino acid sequence consisting of a single extracellular immunoglobulin variable (IgV)-like domain followed by a 147 amino acid region containing five membrane-spanning domains and a 16 amino acid cytoplasmic tail. The amino acid sequence of the clones was 73% homologous to human IAP and therefore it was termed pig IAP or CD47. Reverse transcription-polymerase chain reaction (RT-PCR) showed that pig CD47 was expressed in a wide range of tissues and detected different alternatively spliced forms. The monoclonal antibody (mAb) BRIC 126, anti-human CD47, was shown, by flow cytometry, to stain pig platelets as well as Chinese hamster ovary (CHO) cells transfected with the cDNA encoding pig CD47. Western blot analysis of pig erythocytes and platelets showed a molecular weight (MW) of 43 000-50 000 and of 55 000-65 000, respectively, under non-reducing conditions. Pig CD47 was stably expressed on CHO cells and shown to bind human thrombospondin (TSP). BRIC126 antibody inhibited the binding of platelets and of CD47-transfected cells to human TSP and to pig fibrinogen, whereas no effect was observed on control CHO cells.
Collapse
Affiliation(s)
- Yasser E A Shahein
- Unidad Mixta Consejo Superior de Investigaciones Cienti;ficas-Universidad de Córdoba, Departamento de Genética, Campus de Rabanales, Córdoba, Spain
| | | | | |
Collapse
|
38
|
Yamauchi Y, Kuroki M, Imakiire T, Uno K, Abe H, Beppu R, Yamashita Y, Kuroki M, Shirakusa T. Opposite effects of thrombospondin-1 via CD36 and CD47 on homotypic aggregation of monocytic cells. Matrix Biol 2002; 21:441-8. [PMID: 12225809 DOI: 10.1016/s0945-053x(02)00036-7] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Thrombospondin-1 (TSP-1), an extracellular matrix protein, has a multimodular structure and each domain specifies a distinct biological function through interaction with a specific ligand. In this study we found that exogenously added TSP-1 inhibits phorbol myristate acetate (PMA)/LPS-induced homotypic aggregation of human monocytic U937 cells, whereas the 70-kDa fragment of TSP-1 generated by the proteolytic cleavage of the intact molecule promotes the homotypic aggregation. The aggregation was also inhibited by anti-CD47 mAb or the 4N1K peptide, of which sequence is derived from the CD47-binding site of TSP-1 and absent in the 70-kDa fragment. In contrast, the augmented cell aggregation by the 70-kDa fragment was hampered by anti-CD36 mAb or antibody against the CD36-binding site of TSP-1. The cell aggregation of U937 cells was completely blocked, even in the presence of the 70-kDa fragment, by mAb against leukocyte function associated antigen-1 (LFA-1) or intercellular adhesion molecule-1 (ICAM-1). We therefore propose that TSP-1 may regulate LFA-1/ICAM-1-mediated cell adhesion of monocytes/macrophages by either the inhibitory effect through CD47 or the promoting effect through CD36 depending on which domain/fragment is functional in a given biological setting.
Collapse
Affiliation(s)
- Yasushi Yamauchi
- Department of Biochemistry, Fukuoka University School of Medicine, 7-45-1 Nanakuma, Jonan-ku, Fukuoka 814-0180, Japan
| | | | | | | | | | | | | | | | | |
Collapse
|
39
|
de Vries HE, Hendriks JJA, Honing H, De Lavalette CR, van der Pol SMA, Hooijberg E, Dijkstra CD, van den Berg TK. Signal-regulatory protein alpha-CD47 interactions are required for the transmigration of monocytes across cerebral endothelium. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 2002; 168:5832-9. [PMID: 12023387 DOI: 10.4049/jimmunol.168.11.5832] [Citation(s) in RCA: 110] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Monocyte infiltration into inflamed tissue requires their initial arrest onto the endothelial cells (ECs), followed by firm adhesion and subsequent transmigration. Although several pairs of adhesion molecules have been shown to play a role in the initial adhesion of monocytes to ECs, the mechanism of transendothelial migration is poorly defined. In this study, we have investigated the role of signal-regulatory protein (SIRP)alpha-CD47 interactions in monocyte transmigration across brain ECs. CD47 expression was observed in vivo on cerebral endothelium of both control animals and animals suffering from experimental allergic encephalomyelitis. To investigate whether SIRPalpha-CD47 interactions are instrumental in the trafficking of monocytes across cerebral EC monolayers, in vitro assays were conducted in which the migration of monocytes, but not adhesion, was found to be effectively diminished by blocking SIRPalpha and CD47 on monocytes and ECs, respectively. In this process, SIRPalpha was found to interact solely with its counterligand CD47 on ECs. Overexpression of the CD47 molecule on brain ECs significantly enhanced monocytic transmigration, but did not affect adhesion. SIRPalpha-CD47-mediated transendothelial migration involved Gi protein activity, a known signaling component of CD47. Finally, cross-linking of CD47 on brain ECs induced cytoskeletal reorganization of the endothelium, a process that was Gi protein independent. These data provide the first evidence that the interaction of CD47 with its monocytic counterligand SIRPalpha is of importance in the final step of monocyte trafficking into the brain, a critical event in the development of neuroinflammatory diseases.
Collapse
Affiliation(s)
- Helga E de Vries
- Department of Molecular Cell Biology, Vrije Universiteit Medical Center, Amsterdam, The Netherlands.
| | | | | | | | | | | | | | | |
Collapse
|
40
|
Bhattacharya G, Miller C, Kimberling WJ, Jablonski MM, Cosgrove D. Localization and expression of usherin: a novel basement membrane protein defective in people with Usher's syndrome type IIa. Hear Res 2002; 163:1-11. [PMID: 11788194 DOI: 10.1016/s0378-5955(01)00344-6] [Citation(s) in RCA: 65] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
People with Usher's syndrome type IIa have mutations in a novel gene encoding a protein with domains commonly found in many types of extracellular matrix and cell surface receptor proteins. Here we report that this protein, which we refer to as usherin, is a new basement membrane protein. In the mouse, usherin has a broad, but not ubiquitous, tissue distribution. Usherin is found in all of the capillary and structural basement membranes of the human and mouse retina and in the murine inner ear at both post-natal day 0 and in the adult. High levels of usherin are also observed in tissues not affected in Usher's syndrome type IIa, including spleen, testis, oviduct, epididymis, submaxillary gland, and large and small intestines. Many organs are completely devoid of usherin, including the brain, skin, kidney, lung, liver, and skeletal muscle. Expression was observed in the smooth muscle of the small intestine, colon, and oviduct, however, usherin is not present in cardiac smooth muscle. Usherin is critical for normal development and tissue homeostasis in the inner ear and retina, illustrating yet another example of the importance of basement membranes in the development and function of tissues.
Collapse
|
41
|
Liu Y, Merlin D, Burst SL, Pochet M, Madara JL, Parkos CA. The role of CD47 in neutrophil transmigration. Increased rate of migration correlates with increased cell surface expression of CD47. J Biol Chem 2001; 276:40156-66. [PMID: 11479293 DOI: 10.1074/jbc.m104138200] [Citation(s) in RCA: 151] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
CD47, a cell surface glycoprotein, plays an important role in modulating neutrophil (PMN) migration across endothelial and epithelial monolayers. Here we show that anti-CD47 monoclonal antibodies (mAbs) delay PMN migration across collagen-coated filters or T84 epithelial monolayers toward the chemoattractant formylmethionylleucylphenylalanine (fMLP). Despite delayed transmigration by anti-CD47 mAbs, the numbers of PMN migrating across in either condition were the same as in the presence of control non-inhibitory mAbs. Cell surface labeling and immunoprecipitation demonstrated upregulation of CD47 to the PMN cell surface with kinetics similar to those of the transmigration response. Subcellular fractionation studies revealed redistribution of CD47 from intracellular compartments that co-sediment with secondary granules to plasma membrane-containing fractions after fMLP stimulation. Experiments performed to investigate potential signaling pathways revealed that inhibition of tyrosine phosphorylation with genistein reversed the anti-CD47-mediated PMN migration delay, whereas inhibition of phosphatidylinositol 3-kinase only partially reversed anti-CD47 effects that correlated with a rapid increase in PMN cell surface CD47. Analysis of the contribution of epithelial-expressed CD47 to PMN transmigration revealed that PMN migration across CD47-deficient epithelial monolayers (CaCO2) was significantly increased after stable transfection with CD47. These results suggest that cell surface CD47 and downstream tyrosine phosphorylation signaling events regulate, in part, the rate of PMN migration during the inflammatory response.
Collapse
Affiliation(s)
- Y Liu
- Department of Pathology and Laboratory Medicine, Division of Gastrointestinal Pathology, Emory University, Woodruff Memorial Research Building Rm. 2331, Atlanta, GA 30322, USA.
| | | | | | | | | | | |
Collapse
|
42
|
Li Z, He L, Wilson K, Roberts D. Thrombospondin-1 inhibits TCR-mediated T lymphocyte early activation. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 2001; 166:2427-36. [PMID: 11160302 DOI: 10.4049/jimmunol.166.4.2427] [Citation(s) in RCA: 81] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Biological activities of the matrix glycoprotein thrombospondin-1 (TSP1) are cell type specific and depend on the relative expression or activation of several TSP1 receptors. Although engaging individual TSP1 receptors in T lymphocytes can elicit costimulating signals, in this study we show that intact TSP1 inhibits TCR-mediated T cell activation, assessed globally using cDNA microarrays. TSP1 signaling suppressed expression of several genes induced in Jurkat T cells, including the T cell activation markers CD69, early growth response gene-1 (Egr-1), and phosphatase of activated cells (PAC-1). TCR-stimulated and CD47-costimulated IL-2 secretion and cell surface CD69 expression were also inhibited by TSP1. The specific inhibitory effect of TSP1 was verified in freshly isolated human PBMCs. TSP1 inhibited TCR-mediated but not protein kinase C-mediated T cell activation. Using CD69 expression as a marker, we demonstrated that the inhibitory activity of TSP1 depended on two TSP1 receptors, CD47 and integrin-associated protein heparan sulfate proteoglycans. Signals from these receptors inhibited TCR signaling downstream of ZAP70, but upstream of NF-AT. Therefore, the expression of TSP1 induced during wound repair and in tumor stroma may limit T cell activation at these sites.
Collapse
Affiliation(s)
- Z Li
- Laboratory of Pathology, Division of Clinical Science, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892, USA
| | | | | | | |
Collapse
|
43
|
Bornstein P, Armstrong LC, Hankenson KD, Kyriakides TR, Yang Z. Thrombospondin 2, a matricellular protein with diverse functions. Matrix Biol 2000; 19:557-68. [PMID: 11102746 DOI: 10.1016/s0945-053x(00)00104-9] [Citation(s) in RCA: 134] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Thrombospondin (TSP) 2 is a close relative of TSP1 but differs in its temporal and spatial distribution in the mouse. This difference in expression undoubtedly reflects the marked disparity in the DNA sequences of the promoters in the genes encoding the two proteins. The synthesis of TSP2 occurs primarily in connective tissues of the developing and growing mouse. In the adult animal the protein is again produced in response to tissue injury and in association with the growth of tumors. Despite the abnormalities in collagen fibrillogenesis, fragility of skin, and laxity of tendons and ligaments observed in the TSP2-null mouse, TSP2 does not appear to contribute directly to the structural integrity of connective tissue elements. Instead, emerging evidence supports a mode of action of TSP2 'at a distance', i.e. by modulating the activity and bioavailability of proteases and growth factors in the pericellular environment and, very likely, by interaction with cell-surface receptors. Thus, TSP2 qualifies as a matricellular protein, as defined in the introduction to this minireview series. The phenotype of TSP2-null mice has been very helpful in providing clues to the functions of TSP2. In addition to histological and functional abnormalities in connective tissues, these mice display an increased vascularity of the dermis and subdermal tissues, increased endosteal bone growth, a bleeding defect, and a marked adhesive defect of dermal fibroblasts. Our laboratory has established that TSP2 binds matrix metalloproteinase 2 (MMP2) and that the adhesive defect in TSP2-null fibroblasts results from increased MMP2 activity. The investigation of the basis for the other defects in the TSP2-null mouse is likely to yield equally interesting results.
Collapse
Affiliation(s)
- P Bornstein
- Department of Biochemistry, University of Washington, Seattle, WA 98195, USA.
| | | | | | | | | |
Collapse
|
44
|
Abstract
Thrombospondin-1 (TSP-1) is a matricellular protein that regulates cellular phenotype during tissue genesis and repair. It acts as a molecular facilitator by bringing together cytokines, growth factors, matrix components, membrane receptors and extracellular proteases. TSP-1 binds to a wide variety of integrin and non-integrin cell surface receptors. The binding sites for these receptors on TSP-1 are dispersed throughout the molecule, with most domains binding multiple receptors. In some cases, TSP-1 binds to multiple receptors concurrently, and recent data indicate that there is cross-talk between the receptor systems. Thus, TSP-1 may function to direct the clustering of receptors to specialized domains for adhesion and signal transduction.
Collapse
Affiliation(s)
- H Chen
- Division of Cancer Biology and Angiogenesis, Department of Pathology, Beth Israel Deaconess Medical Center, Research North, Rm. 270C, 99 Brookline Avenue, Boston, MA 02215, USA
| | | | | |
Collapse
|
45
|
Abstract
Considerable progress has been made towards understanding the function of thrombospondin-1 and-2. The description of the phenotype of mice with thrombospondin-1 and-2 knocked-out supports in vitro biochemical and cell-biological data and has opened new avenues of research. Recently, our understanding of the roles of thrombospondins in the activation of TGFbeta, inhibition of angiogenesis and the initiation of signal transduction has advanced.
Collapse
Affiliation(s)
- J Lawler
- Department of Pathology, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, Massachusetts 02215, USA.
| |
Collapse
|
46
|
Hartmann S, Hofsteenge J. Properdin, the positive regulator of complement, is highly C-mannosylated. J Biol Chem 2000; 275:28569-74. [PMID: 10878002 DOI: 10.1074/jbc.m001732200] [Citation(s) in RCA: 77] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Properdin is the positive regulator of the alternative pathway of complement activation. The 53-kDa protein is essentially composed of six thrombospondin type 1 repeats, all of which contain the WXXW motif, the recognition sequence for C-mannosylation. C-Mannosylation is a post-translational modification of tryptophan residues in which, in contrast to the well known N- and O-glycosylation, the carbohydrate is attached via a C-C bond to C-2 of the indole moiety of tryptophan. C-Mannosylation was first found in human RNase 2 and interleukin-12. The terminal complement proteins C6-C9 also carry this modification as part of their thrombospondin type 1 repeats. We studied the C-mannosylation pattern of human properdin by mass spectrometry and Edman degradation. Properdin contains 20 tryptophans of which 17 are part of a WXXW motif. Fourteen tryptophans were found to be modified 100%. This is the first example of a protein in which the majority of tryptophan residues occurs in the C-mannosylated form. These results show that C-mannosylated proteins occur at several steps along the complement activation cascade. Therefore, this system would be ideal to investigate the function of C-mannosylation.
Collapse
Affiliation(s)
- S Hartmann
- Friedrich-Miescher Institut, CH-4058 Basel, Switzerland
| | | |
Collapse
|
47
|
Chandrasekaran L, He CZ, Al-Barazi H, Krutzsch HC, Iruela-Arispe ML, Roberts DD. Cell contact-dependent activation of alpha3beta1 integrin modulates endothelial cell responses to thrombospondin-1. Mol Biol Cell 2000; 11:2885-900. [PMID: 10982388 PMCID: PMC14963 DOI: 10.1091/mbc.11.9.2885] [Citation(s) in RCA: 117] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Abstract
Thrombospondin-1 (TSP1) can inhibit angiogenesis by interacting with endothelial cell CD36 or proteoglycan receptors. We have now identified alpha3beta1 integrin as an additional receptor for TSP1 that modulates angiogenesis and the in vitro behavior of endothelial cells. Recognition of TSP1 and an alpha3beta1 integrin-binding peptide from TSP1 by normal endothelial cells is induced after loss of cell-cell contact or ligation of CD98. Although confluent endothelial cells do not spread on a TSP1 substrate, alpha3beta1 integrin mediates efficient spreading on TSP1 substrates of endothelial cells deprived of cell-cell contact or vascular endothelial cadherin signaling. Activation of this integrin is independent of proliferation, but ligation of the alpha3beta1 integrin modulates endothelial cell proliferation. In solution, both intact TSP1 and the alpha3beta1 integrin-binding peptide from TSP1 inhibit proliferation of sparse endothelial cell cultures independent of their CD36 expression. However, TSP1 or the same peptide immobilized on the substratum promotes their proliferation. The TSP1 peptide, when added in solution, specifically inhibits endothelial cell migration and inhibits angiogenesis in the chick chorioallantoic membrane, whereas a fragment of TSP1 containing this sequence stimulates angiogenesis. Therefore, recognition of immobilized TSP1 by alpha3beta1 integrin may stimulate endothelial cell proliferation and angiogenesis. Peptides that inhibit this interaction are a novel class of angiogenesis inhibitors.
Collapse
Affiliation(s)
- L Chandrasekaran
- Laboratory of Pathology, National Cancer Institute, National Institutes of Health, Bethesda, Maryland 20892, USA
| | | | | | | | | | | |
Collapse
|
48
|
Gotthardt M, Trommsdorff M, Nevitt MF, Shelton J, Richardson JA, Stockinger W, Nimpf J, Herz J. Interactions of the low density lipoprotein receptor gene family with cytosolic adaptor and scaffold proteins suggest diverse biological functions in cellular communication and signal transduction. J Biol Chem 2000; 275:25616-24. [PMID: 10827173 DOI: 10.1074/jbc.m000955200] [Citation(s) in RCA: 367] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The members of the low density lipoprotein (LDL) receptor gene family bind a broad spectrum of extracellular ligands. Traditionally, they had been regarded as mere cargo receptors that promote the endocytosis and lysosomal delivery of these ligands. However, recent genetic experiments in mice have revealed critical functions for two LDL receptor family members, the very low density lipoprotein receptor and the apoE receptor-2, in the transmission of extracellular signals and the activation of intracellular tyrosine kinases. This process regulates neuronal migration and is crucial for brain development. Signaling through these receptors requires the interaction of their cytoplasmic tails with the intracellular adaptor protein Disabled-1 (DAB1). Here, we identify an extended set of cytoplasmic proteins that might also participate in signal transmission by the LDL receptor gene family. Most of these novel proteins are adaptor or scaffold proteins that contain PID or PDZ domains and function in the regulation of mitogen-activated protein kinases, cell adhesion, vesicle trafficking, or neurotransmission. We show that binding of DAB1 interferes with receptor internalization suggesting a mechanism by which signaling through this class of receptors might be regulated. Taken together, these findings imply much broader physiological functions for the LDL receptor family than had previously been appreciated. They form the basis for the elucidation of the molecular pathways by which cells respond to the diversity of ligands that bind to these multifunctional receptors on the cell surface.
Collapse
Affiliation(s)
- M Gotthardt
- Department of Molecular Genetics and Pathology, University of Texas Southwestern Medical Center, Dallas 75390-9046, USA
| | | | | | | | | | | | | | | |
Collapse
|
49
|
Chen N, Chen CC, Lau LF. Adhesion of human skin fibroblasts to Cyr61 is mediated through integrin alpha 6beta 1 and cell surface heparan sulfate proteoglycans. J Biol Chem 2000; 275:24953-61. [PMID: 10821835 DOI: 10.1074/jbc.m003040200] [Citation(s) in RCA: 159] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
The angiogenic inducer Cyr61 is an extracellular matrix-associated heparin-binding protein that can mediate cell adhesion, stimulate cell migration, and enhance growth factor-stimulated DNA synthesis in both fibroblasts and endothelial cells in culture. In vivo, Cyr61 induces neovascularization and promotes tumor growth. Cyr61 is a prototypic member of a highly conserved family of secreted proteins that includes connective tissue growth factor, nephroblastoma overexpressed, Elm-1/WISP-1, Cop-1/WISP-2, and WISP-3. Encoded by an immediate early gene, Cyr61 synthesis is induced by serum growth factors in cultured fibroblasts and in dermal fibroblasts during cutaneous wound healing. We previously demonstrated that Cyr61 mediates adhesion of vascular endothelial cells and activation-dependent adhesion of blood platelets through direct interaction with integrins alpha(V)beta(3) and alpha(IIb)beta(3), respectively. In this study, we show that the adhesion of primary human skin fibroblasts to Cyr61 is mediated through integrin alpha(6)beta(1) and cell surface heparan sulfate proteoglycans (HSPGs), which most likely serve as co-receptors. Either destruction of cell surface HSPGs or prior occupancy of the Cyr61 heparin-binding site completely blocked cell adhesion to Cyr61. A heparin-binding defective mutant of Cyr61 was unable to mediate fibroblast adhesion through integrin alpha(6)beta(1) but still mediated endothelial cell adhesion through integrin alpha(V)beta(3), indicating that endothelial cell adhesion through integrin alpha(V)beta(3) is independent of the heparin-binding activity of Cyr61. These results identify Cyr61 as a novel adhesive substrate for integrin alpha(6)beta(1) and provide the first demonstration of the requirement for HSPGs in integrin-mediated cell attachment. In addition, these findings suggest that Cyr61 might elicit disparate biological effects in different cell types through interaction with distinct integrin receptors.
Collapse
Affiliation(s)
- N Chen
- Department of Molecular Genetics, University of Illinois at Chicago College of Medicine, Chicago, Illinois 60607-7170, USA
| | | | | |
Collapse
|
50
|
Yu H, Tyrrell D, Cashel J, Guo NH, Vogel T, Sipes JM, Lam L, Fillit HM, Hartman J, Mendelovitz S, Panel A, Roberts DD. Specificities of heparin-binding sites from the amino-terminus and type 1 repeats of thrombospondin-1. Arch Biochem Biophys 2000; 374:13-23. [PMID: 10640391 DOI: 10.1006/abbi.1999.1597] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Interactions of heparin with intact human thrombospondin-1 (TSP1) and with two heparin-binding fragments of TSP1 were characterized using chemically modified heparins, a vascular heparan sulfate proteoglycan, and a series of heparin oligosaccharides prepared by partial deaminative cleavage. The avidity of TSP1 binding increased with oligosaccharide size, with plateaus at 4 to 6 and at 8 to 10 monosaccharide units. The dependence on oligosaccharide size for binding to the recombinant amino-terminal heparin-binding domain of TSP1 was the same as that of the intact TSP1 molecule but differed from that of a synthetic heparin-binding peptide from the type 1 repeats, suggesting that the interaction between intact TSP1 and heparin is primarily mediated by the amino-terminal domain. Based on activities of chemically modified heparins, binding to TSP1 depended primarily on 2-N- and 6-O-sulfation of glucosamine and to a lesser degree on 2,3-O-sulfation and the carboxyl residues of the uronic acids. In contrast, all of these modifications were required for binding of heparin to the type 1 repeat peptides. Affinity purification of heparin octasaccharides on immobilized TSP1 type 1 repeat peptides revealed a preference for oligosaccharides containing the disaccharide sequence IdoA(2-OSO(3))alpha1-4-GlcNS(6-OSO(3)). Binding of these oligosaccharides to the peptide required the Trp residues. These data demonstrate that the heparin-binding specificities of intact TSP1 and peptides from the type 1 repeats overlap with that of basic fibroblast growth factor (FGF2) and are consistent with the ability of these TSP1-derived molecules to inhibit FGF2-stimulated angiogenesis.
Collapse
Affiliation(s)
- H Yu
- Laboratory of Pathology, National Cancer Institute, Bethesda, Maryland 20892, USA
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|