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Blazejewski SM, Bennison SA, Ha NT, Liu X, Smith TH, Dougherty KJ, Toyo-Oka K. Rpsa Signaling Regulates Cortical Neuronal Morphogenesis via Its Ligand, PEDF, and Plasma Membrane Interaction Partner, Itga6. Cereb Cortex 2021; 32:770-795. [PMID: 34347028 DOI: 10.1093/cercor/bhab242] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2020] [Revised: 06/25/2021] [Accepted: 06/25/2021] [Indexed: 12/25/2022] Open
Abstract
Neuromorphological defects underlie neurodevelopmental disorders and functional defects. We identified a function for Rpsa in regulating neuromorphogenesis using in utero electroporation to knockdown Rpsa, resulting in apical dendrite misorientation, fewer/shorter extensions, and decreased spine density with altered spine morphology in upper neuronal layers and decreased arborization in upper/lower cortical layers. Rpsa knockdown disrupts multiple aspects of cortical development, including radial glial cell fiber morphology and neuronal layering. We investigated Rpsa's ligand, PEDF, and interacting partner on the plasma membrane, Itga6. Rpsa, PEDF, and Itga6 knockdown cause similar phenotypes, with Rpsa and Itga6 overexpression rescuing morphological defects in PEDF-deficient neurons in vivo. Additionally, Itga6 overexpression increases and stabilizes Rpsa expression on the plasma membrane. GCaMP6s was used to functionally analyze Rpsa knockdown via ex vivo calcium imaging. Rpsa-deficient neurons showed less fluctuation in fluorescence intensity, suggesting defective subthreshold calcium signaling. The Serpinf1 gene coding for PEDF is localized at chromosome 17p13.3, which is deleted in patients with the neurodevelopmental disorder Miller-Dieker syndrome. Our study identifies a role for Rpsa in early cortical development and for PEDF-Rpsa-Itga6 signaling in neuromorphogenesis, thus implicating these molecules in the etiology of neurodevelopmental disorders like Miller-Dieker syndrome and identifying them as potential therapeutics.
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Affiliation(s)
- Sara M Blazejewski
- Department of Neurobiology and Anatomy, Drexel University College of Medicine, Philadelphia, PA 19129, USA
| | - Sarah A Bennison
- Department of Neurobiology and Anatomy, Drexel University College of Medicine, Philadelphia, PA 19129, USA
| | - Ngoc T Ha
- Department of Neurobiology and Anatomy, Drexel University College of Medicine, Philadelphia, PA 19129, USA
| | - Xiaonan Liu
- Department of Neurobiology and Anatomy, Drexel University College of Medicine, Philadelphia, PA 19129, USA
| | - Trevor H Smith
- Department of Neurobiology and Anatomy, Drexel University College of Medicine, Philadelphia, PA 19129, USA
| | - Kimberly J Dougherty
- Department of Neurobiology and Anatomy, Drexel University College of Medicine, Philadelphia, PA 19129, USA
| | - Kazuhito Toyo-Oka
- Department of Neurobiology and Anatomy, Drexel University College of Medicine, Philadelphia, PA 19129, USA
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2
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Fu M, Barlow-Anacker AJ, Kuruvilla KP, Bowlin GL, Seidel CW, Trainor PA, Gosain A. 37/67-laminin receptor facilitates neural crest cell migration during enteric nervous system development. FASEB J 2020; 34:10931-10947. [PMID: 32592286 DOI: 10.1096/fj.202000699r] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2020] [Revised: 05/28/2020] [Accepted: 06/08/2020] [Indexed: 12/16/2022]
Abstract
Enteric nervous system (ENS) development is governed by interactions between neural crest cells (NCC) and the extracellular matrix (ECM). Hirschsprung disease (HSCR) results from incomplete NCC migration and failure to form an appropriate ENS. Prior studies implicate abnormal ECM in NCC migration failure. We performed a comparative microarray of the embryonic distal hindgut of wild-type and EdnrBNCC-/- mice that model HSCR and identified laminin-β1 as upregulated in EdnrBNCC-/- colon. We identified decreased expression of 37/67 kDa laminin receptor (LAMR), which binds laminin-β1, in human HSCR myenteric plexus and EdnrBNCC-/- NCC. Using a combination of in vitro gut slice cultures and ex vivo organ cultures, we determined the mechanistic role of LAMR in NCC migration. We found that enteric NCC express LAMR, which is downregulated in human and murine HSCR. Binding of LAMR by the laminin-β1 analog YIGSR promotes NCC migration. Silencing of LAMR abrogated these effects. Finally, applying YIGSR to E13.5 EdnrBNCC-/- colon explants resulted in 80%-100% colonization of the hindgut. This study adds LAMR to the large list of receptors through which NCC interact with their environment during ENS development. These results should be used to inform ongoing integrative, regenerative medicine approaches to HSCR.
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Affiliation(s)
- Ming Fu
- Division of Pediatric Surgery, Department of Surgery, University of Tennessee Health Sciences Center, Memphis, TN, USA
| | - Amanda J Barlow-Anacker
- Department of Surgery, University of Wisconsin School of Medicine and Public Health, Madison, WI, USA
| | - Korah P Kuruvilla
- Division of Pediatric Surgery, Department of Surgery, University of Tennessee Health Sciences Center, Memphis, TN, USA
| | - Gary L Bowlin
- Department of Biomedical Engineering, University of Memphis, Memphis, TN, USA
| | | | - Paul A Trainor
- Stowers Institute for Medical Research, Kansas City, MO, USA.,Department of Anatomy and Cell Biology, University of Kansas School of Medicine, Kansas City, KS, USA
| | - Ankush Gosain
- Division of Pediatric Surgery, Department of Surgery, University of Tennessee Health Sciences Center, Memphis, TN, USA.,Children's Foundation Research Institute, Le Bonheur Children's Hospital, Memphis, TN, USA
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3
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Lithgow KV, Church B, Gomez A, Tsao E, Houston S, Swayne LA, Cameron CE. Identification of the Neuroinvasive Pathogen Host Target, LamR, as an Endothelial Receptor for the Treponema pallidum Adhesin Tp0751. mSphere 2020; 5:e00195-20. [PMID: 32238570 DOI: 10.1128/mSphere.00195-20] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Treponema pallidum subsp. pallidum is the causative agent of syphilis, a human-specific sexually transmitted infection that causes a multistage disease with diverse clinical manifestations. Treponema pallidum undergoes rapid vascular dissemination to penetrate tissue, placental, and blood-brain barriers and gain access to distant tissue sites. The rapidity and extent of T. pallidum dissemination are well documented, but the molecular mechanisms have yet to be fully elucidated. One protein that has been shown to play a role in treponemal dissemination is Tp0751, a T. pallidum adhesin that interacts with host components found within the vasculature and mediates bacterial adherence to endothelial cells under shear flow conditions. In this study, we further explore the molecular interactions of Tp0751-mediated adhesion to the vascular endothelium. We demonstrate that recombinant Tp0751 adheres to human endothelial cells of macrovascular and microvascular origin, including a cerebral brain microvascular endothelial cell line. Adhesion assays using recombinant Tp0751 N-terminal truncations reveal that endothelial binding is localized to the lipocalin fold-containing domain of the protein. We also confirm this interaction using live T. pallidum and show that spirochete attachment to endothelial monolayers is disrupted by Tp0751-specific antiserum. Further, we identify the 67-kDa laminin receptor (LamR) as an endothelial receptor for Tp0751 using affinity chromatography, coimmunoprecipitation, and plate-based binding methodologies. Notably, LamR has been identified as a receptor for adhesion of other neurotropic invasive bacterial pathogens to brain endothelial cells, including Neisseria meningitidis, Haemophilus influenzae, and Streptococcus pneumoniae, suggesting the existence of a common mechanism for extravasation of invasive extracellular bacterial pathogens.IMPORTANCE Syphilis is a sexually transmitted infection caused by the spirochete bacterium Treponema pallidum subsp. pallidum. The continued incidence of syphilis demonstrates that screening and treatment strategies are not sufficient to curb this infectious disease, and there is currently no vaccine available. Herein we demonstrate that the T. pallidum adhesin Tp0751 interacts with endothelial cells that line the lumen of human blood vessels through the 67-kDa laminin receptor (LamR). Importantly, LamR is also a receptor for meningitis-causing neuroinvasive bacterial pathogens such as Neisseria meningitidis, Haemophilus influenzae, and Streptococcus pneumoniae Our findings enhance understanding of the Tp0751 adhesin and present the intriguing possibility that the molecular events of Tp0751-mediated treponemal dissemination may mimic the endothelial interaction strategies of other invasive pathogens.
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Zhou GP, Liao SM, Chen D, Huang RB. The Cooperative Effect between Polybasic Region (PBR) and Polysialyltransferase Domain (PSTD) within Tumor-Target Polysialyltranseferase ST8Sia II. Curr Top Med Chem 2020; 19:2831-2841. [PMID: 31755393 DOI: 10.2174/1568026619666191121145924] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2019] [Revised: 10/16/2019] [Accepted: 10/20/2019] [Indexed: 12/29/2022]
Abstract
ST8Sia II (STX) is a highly homologous mammalian polysialyltransferase (polyST), which is a validated tumor-target in the treatment of cancer metastasis reliant on tumor cell polysialylation. PolyST catalyzes the synthesis of α2,8-polysialic acid (polySia) glycans by carrying out the activated CMP-Neu5Ac (Sia) to N- and O-linked oligosaccharide chains on acceptor glycoproteins. In this review article, we summarized the recent studies about intrinsic correlation of two polybasic domains, Polysialyltransferase domain (PSTD) and Polybasic region (PBR) within ST8Sia II molecule, and suggested that the critical amino acid residues within the PSTD and PBR motifs of ST8Sia II for polysialylation of Neural cell adhesion molecules (NCAM) are related to ST8Sia II activity. In addition, the conformational changes of the PSTD domain due to point mutations in the PBR or PSTD domain verified an intramolecular interaction between the PBR and the PSTD. These findings have been incorporated into Zhou's NCAM polysialylation/cell migration model, which will provide new perspectives on drug research and development related to the tumor-target ST8Sia II.
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Affiliation(s)
- Guo-Ping Zhou
- National Engineering Research Center for Non-Food Biorefinery, State Key Laboratory of Non-Food Biomass and Enzyme Technology, Guangxi Key Laboratory of Bio-refinery, Guangxi Academy of Sciences, 98 Daling Road, Nanning, 530007, China.,Gordon Life Science Institute, NC 27804, United States
| | - Si-Ming Liao
- National Engineering Research Center for Non-Food Biorefinery, State Key Laboratory of Non-Food Biomass and Enzyme Technology, Guangxi Key Laboratory of Bio-refinery, Guangxi Academy of Sciences, 98 Daling Road, Nanning, 530007, China
| | - Dong Chen
- National Engineering Research Center for Non-Food Biorefinery, State Key Laboratory of Non-Food Biomass and Enzyme Technology, Guangxi Key Laboratory of Bio-refinery, Guangxi Academy of Sciences, 98 Daling Road, Nanning, 530007, China
| | - Ri-Bo Huang
- National Engineering Research Center for Non-Food Biorefinery, State Key Laboratory of Non-Food Biomass and Enzyme Technology, Guangxi Key Laboratory of Bio-refinery, Guangxi Academy of Sciences, 98 Daling Road, Nanning, 530007, China
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Vania L, Morris G, Otgaar TC, Bignoux MJ, Bernert M, Burns J, Gabathuse A, Singh E, Ferreira E, Weiss SFT. Patented therapeutic approaches targeting LRP/LR for cancer treatment. Expert Opin Ther Pat 2019; 29:987-1009. [PMID: 31722579 DOI: 10.1080/13543776.2019.1693543] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Introduction: The ubiquitously expressed 37 kDa/67 kDa high-affinity laminin receptor (laminin receptor precursor/laminin receptor, LRP/LR) is a protein found to play several roles within cells. The receptor is located in the nucleus, cytosol and the cell surface. LRP/LR mediates cell proliferation, cell adhesion and cell differentiation. As a result, it is seen to enhance tumor angiogenesis as well as invasion and adhesion, key steps in the metastatic cascade of cancer. Recent findings have shown that LRP/LR is involved in the maintenance of cell viability through apoptotic evasion, allowing for tumor progression. Thus, several patented therapeutic approaches targeting the receptor for the prevention and treatment of cancer have emerged.Areas covered: The several roles that LRP/LR plays in cancer progression as well as an overview of the current therapeutic patented strategies targeting LRP/LR and cancer to date.Expert opinion: Small molecule inhibitors, monoclonal antibodies and small interfering RNAs might act used as powerful tools in preventing tumor angiogenesis and metastasis through the induction of apoptosis and telomere erosion in several cancers. This review offers an overview of the roles played by LRP/LR in cancer progression, while providing novel patented approaches targeting the receptor as potential therapeutic routes for the treatment of cancer as well as various other diseases.
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Affiliation(s)
- Leila Vania
- School of Molecular and Cell Biology, University of the Witwatersrand, Wits, Johannesburg, Republic of South Africa
| | - Gavin Morris
- School of Molecular and Cell Biology, University of the Witwatersrand, Wits, Johannesburg, Republic of South Africa
| | - Tyrone C Otgaar
- School of Molecular and Cell Biology, University of the Witwatersrand, Wits, Johannesburg, Republic of South Africa
| | - Monique J Bignoux
- School of Molecular and Cell Biology, University of the Witwatersrand, Wits, Johannesburg, Republic of South Africa
| | - Martin Bernert
- School of Molecular and Cell Biology, University of the Witwatersrand, Wits, Johannesburg, Republic of South Africa
| | - Jessica Burns
- School of Molecular and Cell Biology, University of the Witwatersrand, Wits, Johannesburg, Republic of South Africa
| | - Anne Gabathuse
- Wits Commercial Enterprise, The Commercial Development Hub, Johannesburg, Republic of South Africa
| | - Elvira Singh
- School of Public Health, University of the Witwatersrand, Johannesburg, Republic of South Africa
| | - Eloise Ferreira
- School of Molecular and Cell Biology, University of the Witwatersrand, Wits, Johannesburg, Republic of South Africa
| | - Stefan F T Weiss
- School of Molecular and Cell Biology, University of the Witwatersrand, Wits, Johannesburg, Republic of South Africa
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6
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An Y, Hu Y, Li X, Li Z, Duan J, Yang XD. Selection of a novel DNA aptamer against OFA/iLRP for targeted delivery of doxorubicin to AML cells. Sci Rep 2019; 9:7343. [PMID: 31089250 PMCID: PMC6517398 DOI: 10.1038/s41598-019-43910-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2019] [Accepted: 05/03/2019] [Indexed: 12/15/2022] Open
Abstract
The standard treatment for most acute myeloid leukemia (AML) is chemotherapy, which is often associated with severe adverse effects. One strategy to reduce the adverse effects is targeted therapy that can selectively deliver anticancer drugs to tumor cells. Immature laminin receptor protein (OFA/iLRP) is a potential target for AML treatment, because it is over-expressed on the surface of AML cells but under-expressed in normal tissue. In this study, we developed the first aptamer for OFA/iLRP and explored its potential as a targeting ligand for delivery of doxorubicin (Dox) to AML cells in vitro. The selected aptamer (AB3) was a 59-base DNA oligonucleotides. It bound to OFA/iLRP structure with a Kd of 101 nM and had minimal cross-reactivity to albumin, trypsin, or ovalbumin. Moreover, AB3 could bind to OFA/iLRP-positive AML cells but not the OFA/iLRP-negative control cells. An aptamer-doxorubicin (Apt-Dox) complex was formed by intercalating doxorubicin into the DNA structure of AB3. Apt-Dox selectively delivered Dox to OFA/iLRP-positive AML cells but notably decreased the drug intake by OFA/iLRP-negative control cells. In addition, cytotoxicity study revealed that Apt-Dox efficaciously destroyed the OFA/iLRP-positive AML cells, but significantly reduced the damage to control cells. The results indicate that the OFA/iLRP aptamer AB3 may have application potential in targeted therapy against AML.
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Affiliation(s)
- Yacong An
- Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, 100005, China
| | - Yan Hu
- Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, 100005, China
| | - Xundou Li
- Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, 100005, China
| | - Zhaoyi Li
- Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, 100005, China
| | - Jinhong Duan
- Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, 100005, China
| | - Xian-Da Yang
- Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, 100005, China.
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7
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Cloutier G, Sallenbach-Morrissette A, Beaulieu JF. Non-integrin laminin receptors in epithelia. Tissue Cell 2019; 56:71-78. [DOI: 10.1016/j.tice.2018.12.005] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2018] [Revised: 12/17/2018] [Accepted: 12/21/2018] [Indexed: 12/14/2022]
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8
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Butò S, Ghirelli C, Aiello P, Tagliabue E, Ardini E, Magnifico A, Montuori N, Sobel ME, Colnaghi MI, Ménard S. Production and Characterization of Monoclonal Antibodies Directed against the Laminin Receptor Precursor. Int J Biol Markers 2018; 12:1-5. [PMID: 9176710 DOI: 10.1177/172460089701200101] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
The 67-kDa laminin receptor (67LR) is an important tumor marker whose molecular structure has not yet been fully elucidated. To shed new light on this molecule, we raised a series of eight new monoclonal antibodies, designated MPLR1 to 8, directed against the 37-kDa recombinant laminin receptor precursor (37LRP). Cross-competition experiments demonstrated that the epitopes recognized by MPLR2, 4 and 5 partially overlap, since MPLR4 and 5 compete with labelled MPLR2 for the binding to recombinant 37LRP. These three antibodies belong to the IgG1 class, whereas the other ones are all IgM. Presumably due to the fact that they are directed against partially unfolded antigenic determinants expressed on the recombinant protein, MPLRs did not recognize the native protein. Indeed, they showed no reactivity at the membrane level in cytofluorimetric analysis and they did not work in immunoprecipitation experiments. In contrast, these reagents are valuable tools in immunoblotting, since they clearly identify a 67-kDa protein (the mature laminin receptor) in addition to the 37-kDa precursor form. MPLRs are thus a new powerful tool which could help in the characterization of the still enigmatic 67LR molecule.
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Affiliation(s)
- S Butò
- Division of Experimental Oncology E, Istituto Nazionale Tumori, Milano, Italy
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9
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Umbaugh CS, Diaz-Quiñones A, Neto MF, Shearer JJ, Figueiredo ML. A dock derived compound against laminin receptor (37 LR) exhibits anti-cancer properties in a prostate cancer cell line model. Oncotarget 2017; 9:5958-5978. [PMID: 29464047 PMCID: PMC5814187 DOI: 10.18632/oncotarget.23236] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2017] [Accepted: 07/16/2017] [Indexed: 11/25/2022] Open
Abstract
Laminin receptor (67 LR) is a 67 kDa protein derived from a 37 kDa precursor (37 LR). 37/67 LR is a strong clinical correlate for progression, aggression, and chemotherapeutic relapse of several cancers including breast, prostate, and colon. The ability of 37/67 LR to promote cancer cell aggressiveness is further increased by its ability to transduce physiochemical and mechanosensing signals in endothelial cells and modulate angiogenesis. Recently, it was demonstrated that 37/67 LR modulates the anti-angiogenic potential of the secreted glycoprotein pigment epithelium-derived factor (PEDF). Restoration of PEDF balance is a desirable therapeutic outcome, and we sought to identify a small molecule that could recapitulate known signaling properties of PEDF but without the additional complications of peptide formulation or gene delivery safety validation. We used an in silico drug discovery approach to target the interaction interface between PEDF and 37 LR. Following cell based counter screening and binding validation, we characterized a hit compound's anti-viability, activation of PEDF signaling-related genes, anti-wound healing, and anti-cancer signaling properties. This hit compound has potential for future development as a lead compound for treating tumor growth and inhibiting angiogenesis.
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Affiliation(s)
- Charles Samuel Umbaugh
- Department of Basic Medical Sciences, Purdue University College of Veterinary Medicine, West Lafayette, IN 47907, USA
| | - Adriana Diaz-Quiñones
- Department of Basic Medical Sciences, Purdue University College of Veterinary Medicine, West Lafayette, IN 47907, USA
| | - Manoel Figueiredo Neto
- Department of Basic Medical Sciences, Purdue University College of Veterinary Medicine, West Lafayette, IN 47907, USA
| | - Joseph J Shearer
- Department of Basic Medical Sciences, Purdue University College of Veterinary Medicine, West Lafayette, IN 47907, USA
| | - Marxa L Figueiredo
- Department of Basic Medical Sciences, Purdue University College of Veterinary Medicine, West Lafayette, IN 47907, USA
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Digiacomo V, Gando IA, Venticinque L, Hurtado A, Meruelo D. The Transition of the 37-Kda Laminin Receptor (Rpsa) to Higher Molecular Weight Species: Sumoylation or Artifact? Cell Mol Biol Lett 2016; 20:571-85. [PMID: 26146125 DOI: 10.1515/cmble-2015-0031] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2015] [Accepted: 06/18/2015] [Indexed: 11/15/2022] Open
Abstract
The 37-kDa laminin receptor (37LRP or RPSA) is a remarkable, multifaceted protein that functions in processes ranging from matrix adhesion to ribosome biogenesis. Its ability to engage extracellular laminin is further thought to contribute to cellular migration and invasion. Most commonly associated with metastatic cancer, RPSA is also increasingly found to be important in other pathologies, including microbial infection, neurodegenerative disease and developmental malformations. Importantly, it is thought to have higher molecular weight forms, including a 67-kDa species (67LR), the expression of which is linked to strong laminin binding and metastatic behavior. The composition of these larger forms has remained elusive and controversial. Homo- and heterodimerization have been proposed as events capable of building the larger species from the monomeric 37-kDa precursor, but solid evidence is lacking. Here, we present data suggesting that higher molecular weight species require SUMOylation to form. We also comment on the difficulty of isolating larger RPSA species for unambiguous identification and demonstrate that cell lines stably expressing tagged RPSA for long periods of time fail to produce tagged higher molecular weight RPSA. It is possible that higher molecular weight species like 67LR are not derived from RPSA.
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Pesapane A, Di Giovanni C, Rossi FW, Alfano D, Formisano L, Ragno P, Selleri C, Montuori N, Lavecchia A. Discovery of new small molecules inhibiting 67 kDa laminin receptor interaction with laminin and cancer cell invasion. Oncotarget 2015; 6:18116-33. [PMID: 26062445 DOI: 10.18632/oncotarget.4016] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2015] [Accepted: 05/18/2015] [Indexed: 01/23/2023] Open
Abstract
The 67 kDa laminin receptor (67LR) is a non-integrin receptor for laminin (LM) that derives from a 37 kDa precursor (37LRP). 67LR expression is increased in neoplastic cells and correlates with an enhanced invasive and metastatic potential. We used structure-based virtual screening (SB-VS) to search for 67LR inhibitory small molecules, by focusing on a 37LRP sequence, the peptide G, able to specifically bind LM. Forty-six compounds were identified and tested on HEK-293 cells transfected with 37LRP/67LR (LR-293 cells). One compound, NSC47924, selectively inhibited LR-293 cell adhesion to LM with IC50 and Ki values of 19.35 and 2.45 μmol/L. NSC47924 engaged residues W176 and L173 of peptide G, critical for specific LM binding. Indeed, NSC47924 inhibited in vitro binding of recombinant 37LRP to both LM and its YIGSR fragment. NSC47924 also impaired LR-293 cell migration to LM and cell invasion. A subsequent hierarchical similarity search with NSC47924 led to the identification of additional four compounds inhibiting LR-293 cell binding to LM: NSC47923, NSC48478, NSC48861, and NSC48869, with IC50 values of 1.99, 1.76, 3.4, and 4.0 μmol/L, respectively, and able to block in vitro cancer cell invasion. These compounds are promising scaffolds for future drug design and discovery efforts in cancer progression.
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Sarnataro D, Pepe A, Altamura G, De Simone I, Pesapane A, Nitsch L, Montuori N, Lavecchia A, Zurzolo C. The 37/67 kDa laminin receptor (LR) inhibitor, NSC47924, affects 37/67 kDa LR cell surface localization and interaction with the cellular prion protein. Sci Rep 2016; 6:24457. [PMID: 27071549 DOI: 10.1038/srep24457] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2015] [Accepted: 03/22/2016] [Indexed: 12/17/2022] Open
Abstract
The 37/67 kDa laminin receptor (LR) is a non-integrin protein, which binds both laminin-1 of the extracellular matrix and prion proteins, that hold a central role in prion diseases. The 37/67 kDa LR has been identified as interactor for the prion protein (PrP(C)) and to be required for pathological PrP (PrP(Sc)) propagation in scrapie-infected neuronal cells, leading to the possibility that 37/67 kDa LR-PrP(C) interaction is related to the pathogenesis of prion diseases. A relationship between 37/67 kDa LR and PrP(C) in the presence of specific LR inhibitor compounds has not been investigated yet. We have characterized the trafficking of 37/67 kDa LR in both neuronal and non-neuronal cells, finding the receptor on the cell surface and nuclei, and identified the 67 kDa LR as the almost exclusive isoform interacting with PrP(C). Here, we show that the treatment with the 37/67 kDa LR inhibitor, NSC47924, affects both the direct 37/67 kDa LR-PrP(C) interaction in vitro and the formation of the immunocomplex in live cells, inducing a progressive internalization of 37/67 kDa LR and stabilization of PrP(C) on the cell surface. These data reveal NSC47924 as a useful tool to regulate PrP(C) and 37/67 kDa LR trafficking and degradation, representing a novel small molecule to be tested against prion diseases.
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McClintock SD, Warner RL, Ali S, Chekuri A, Dame MK, Attili D, Knibbs RK, Aslam MN, Sinkule J, Morgan AC, Barsoum A, Smith LB, Beer DG, Johnson KJ, Varani J. Monoclonal antibodies specific for oncofetal antigen--immature laminin receptor protein: Effects on tumor growth and spread in two murine models. Cancer Biol Ther 2016; 16:724-32. [PMID: 25799942 DOI: 10.1080/15384047.2015.1026484] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
The oncofetal antigen - immature laminin receptor protein (OFA/iLRP) has been linked to metastatic tumor spread for several years. The present study, in which 2 highly-specific, high-affinity OFA/iLRP-reactive mouse monoclonal antibodies were examined for ability to suppress tumor cell growth and metastatic spread in the A20 B-cell leukemia model and the B16 melanoma model, provides the first direct evidence that targeting OFA/iLRP with exogenous antibodies can have therapeutic benefit. While the antibodies were modestly effective at preventing tumor growth at the primary injection site, both antibodies strongly suppressed end-organ tumor formation following intravenous tumor cell injection. Capacity of anti-OFA/iLRP antibodies to suppress tumor spread through the blood in the leukemia model suggests their use as a therapy for individuals with leukemic disease (either for patients in remission or even as part of an induction therapy). The results also suggest use against metastatic spread with solid tumors.
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Key Words
- A20 murine B-cell leukemia
- ADC, Antibody-drug conjugate
- ADCC, Antibody dependent cellular cytotoxicity
- ANOVA, Analysis of variance
- B16 melanoma
- BV, Benovus
- CDC, Complement dependent cytotoxicity
- ELISA, Enzyme-linked immunosorbent assay
- FBS, Fetal bovine serum
- IgG, Immunoglobulin G
- LRP, Laminin receptor protein
- OFA/iLRP, Oncofetal antigen –
- RPMI, Roswell Park Memorial Institute
- SCID, Severe combined immune deficiency
- blood-borne metastasis
- cDNA, complementary DNA
- immature laminin receptor protein
- kD, kilo Dalton
- mRNA, messenger RNA
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Affiliation(s)
- Shannon D McClintock
- a Department of Pathology; The University of Michigan Medical School ; Ann Arbor , MI , USA
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Mazur AJ, Radaszkiewicz T, Makowiecka A, Malicka-Błaszkiewicz M, Mannherz HG, Nowak D. Gelsolin interacts with LamR, hnRNP U, nestin, Arp3 and β-tubulin in human melanoma cells as revealed by immunoprecipitation and mass spectrometry. Eur J Cell Biol 2016; 95:26-41. [DOI: 10.1016/j.ejcb.2015.11.001] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2015] [Revised: 10/08/2015] [Accepted: 11/04/2015] [Indexed: 01/25/2023] Open
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15
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Alqahtani F, Mahdavi J, Wheldon LM, Vassey M, Pirinccioglu N, Royer PJ, Qarani SM, Morroll S, Stoof J, Holliday ND, Teo SY, Oldfield NJ, Wooldridge KG, Ala'Aldeen DAA. Deciphering the complex three-way interaction between the non-integrin laminin receptor, galectin-3 and Neisseria meningitidis. Open Biol 2015; 4:rsob.140053. [PMID: 25274119 PMCID: PMC4221890 DOI: 10.1098/rsob.140053] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
The non-integrin laminin receptor (LAMR1/RPSA) and galectin-3 (Gal-3) are multi-functional host molecules with roles in diverse pathological processes, particularly of infectious or oncogenic origins. Using bimolecular fluorescence complementation and confocal imaging, we demonstrate that the two proteins homo- and heterodimerize, and that each isotype forms a distinct cell surface population. We present evidence that the 37 kDa form of LAMR1 (37LRP) is the precursor of the previously described 67 kDa laminin receptor (67LR), whereas the heterodimer represents an entity that is distinct from this molecule. Site-directed mutagenesis confirmed that the single cysteine (C(173)) of Gal-3 or lysine (K(166)) of LAMR1 are critical for heterodimerization. Recombinant Gal-3, expressed in normally Gal-3-deficient N2a cells, dimerized with endogenous LAMR1 and led to a significantly increased number of internalized bacteria (Neisseria meningitidis), confirming the role of Gal-3 in bacterial invasion. Contact-dependent cross-linking determined that, in common with LAMR1, Gal-3 binds the meningococcal secretin PilQ, in addition to the major pilin PilE. This study adds significant new mechanistic insights into the bacterial-host cell interaction by clarifying the nature, role and bacterial ligands of LAMR1 and Gal-3 isotypes during colonization.
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Affiliation(s)
- Fulwah Alqahtani
- School of Life Sciences, Centre for Biomolecular Sciences, University of Nottingham, University Park, Nottingham NG7 2RD, UK
| | - Jafar Mahdavi
- School of Life Sciences, Centre for Biomolecular Sciences, University of Nottingham, University Park, Nottingham NG7 2RD, UK
| | - Lee M Wheldon
- School of Life Sciences, Centre for Biomolecular Sciences, University of Nottingham, University Park, Nottingham NG7 2RD, UK
| | - Matthew Vassey
- School of Life Sciences, Centre for Biomolecular Sciences, University of Nottingham, University Park, Nottingham NG7 2RD, UK
| | | | - Pierre-Joseph Royer
- School of Life Sciences, Centre for Biomolecular Sciences, University of Nottingham, University Park, Nottingham NG7 2RD, UK
| | - Suzan M Qarani
- School of Life Sciences, Centre for Biomolecular Sciences, University of Nottingham, University Park, Nottingham NG7 2RD, UK
| | - Shaun Morroll
- School of Life Sciences, Centre for Biomolecular Sciences, University of Nottingham, University Park, Nottingham NG7 2RD, UK
| | - Jeroen Stoof
- School of Life Sciences, Centre for Biomolecular Sciences, University of Nottingham, University Park, Nottingham NG7 2RD, UK
| | - Nicholas D Holliday
- School of Life Sciences, Centre for Biomolecular Sciences, University of Nottingham, University Park, Nottingham NG7 2RD, UK
| | - Siew Y Teo
- School of Life Sciences, Centre for Biomolecular Sciences, University of Nottingham, University Park, Nottingham NG7 2RD, UK
| | - Neil J Oldfield
- School of Life Sciences, Centre for Biomolecular Sciences, University of Nottingham, University Park, Nottingham NG7 2RD, UK
| | - Karl G Wooldridge
- School of Life Sciences, Centre for Biomolecular Sciences, University of Nottingham, University Park, Nottingham NG7 2RD, UK
| | - Dlawer A A Ala'Aldeen
- School of Life Sciences, Centre for Biomolecular Sciences, University of Nottingham, University Park, Nottingham NG7 2RD, UK
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16
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Jovanovic K, Chetty CJ, Khumalo T, Da Costa Dias B, Ferreira E, Malindisa ST, Caveney R, Letsolo BT, Weiss SFT. Novel patented therapeutic approaches targeting the 37/67 kDa laminin receptor for treatment of cancer and Alzheimer's disease. Expert Opin Ther Pat 2015; 25:567-82. [PMID: 25747044 DOI: 10.1517/13543776.2015.1014802] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
INTRODUCTION The 37/67 kDa high-affinity laminin receptor (laminin receptor precursor/laminin receptor, LRP/LR) is a multi-faceted cellular receptor. It plays a vital role in the malignancy of various cancer types where it is seen to contribute to invasion, adhesion, apoptosis evasion and angiogenesis. Furthermore, it has been found to play an important role in facilitating the processes leading to neurotoxicity in Alzheimer's disease (AD). Various therapeutic options targeting this receptor have been patented with the outlook on application for the treatment/prevention of these diseases. AREAS COVERED The various roles that LRP/LR plays in cancer, AD and infectious diseases caused by viruses and bacteria have been examined in detail and an overview of the current patented therapeutic strategies targeting this receptor is given. EXPERT OPINION Molecular tools directed against LRP/LR, such as antibodies and small interfering RNA, could prove to be effective in the prevention of metastasis and angiogenesis while inducing apoptosis in cancers. Moreover, these strategies could also be applied to AD where LRP/LR is seen to facilitate the production and internalization of the neurotoxic Aβ peptide. This review provides a comprehensive overview of the mechanisms by which LRP/LR is involved in eliciting pathogenic events, while showing how the use of patented approaches targeting this receptor could be used to treat them.
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Affiliation(s)
- Katarina Jovanovic
- University of the Witwatersrand, School of Molecular and Cell Biology , Private Bag 3, Wits 2050, Johannesburg , Republic of South Africa
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17
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DiGiacomo V, Meruelo D. Looking into laminin receptor: critical discussion regarding the non-integrin 37/67-kDa laminin receptor/RPSA protein. Biol Rev Camb Philos Soc 2015; 91:288-310. [PMID: 25630983 DOI: 10.1111/brv.12170] [Citation(s) in RCA: 90] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2013] [Revised: 12/04/2014] [Accepted: 12/08/2014] [Indexed: 02/06/2023]
Abstract
The 37/67-kDa laminin receptor (LAMR/RPSA) was originally identified as a 67-kDa binding protein for laminin, an extracellular matrix glycoprotein that provides cellular adhesion to the basement membrane. LAMR has evolutionary origins, however, as a 37-kDa RPS2 family ribosomal component. Expressed in all domains of life, RPS2 proteins have been shown to have remarkably diverse physiological roles that vary across species. Contributing to laminin binding, ribosome biogenesis, cytoskeletal organization, and nuclear functions, this protein governs critical cellular processes including growth, survival, migration, protein synthesis, development, and differentiation. Unsurprisingly given its purview, LAMR has been associated with metastatic cancer, neurodegenerative disease and developmental abnormalities. Functioning in a receptor capacity, this protein also confers susceptibility to bacterial and viral infection. LAMR is clearly a molecule of consequence in human disease, directly mediating pathological events that make it a prime target for therapeutic interventions. Despite decades of research, there are still a large number of open questions regarding the cellular biology of LAMR, the nature of its ability to bind laminin, the function of its intrinsically disordered C-terminal region and its conversion from 37 to 67 kDa. This review attempts to convey an in-depth description of the complexity surrounding this multifaceted protein across functional, structural and pathological aspects.
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Affiliation(s)
- Vincent DiGiacomo
- Department of Pathology, New York University School of Medicine, 180 Varick Street, New York, NY 10014, U.S.A
| | - Daniel Meruelo
- Department of Pathology, New York University School of Medicine, 180 Varick Street, New York, NY 10014, U.S.A.,NYU Cancer Institute, 550 First Avenue, New York, NY 10016, U.S.A.,NYU Gene Therapy Center, 550 First Avenue, New York, NY 10016, U.S.A
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18
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Moodley K, Weiss SFT. Downregulation of the non-integrin laminin receptor reduces cellular viability by inducing apoptosis in lung and cervical cancer cells. PLoS One 2013; 8:e57409. [PMID: 23472084 PMCID: PMC3589420 DOI: 10.1371/journal.pone.0057409] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2012] [Accepted: 01/21/2013] [Indexed: 12/31/2022] Open
Abstract
The non-integrin laminin receptor, here designated the 37-kDa/67-kDa laminin receptor (LRP/LR), is involved in many physiologically relevant processes, as well as numerous pathological conditions. The overexpression of LRP/LR on various cancerous cell lines plays critical roles in tumour metastasis and angiogenesis. This study investigated whether LRP/LR is implicated in the maintenance of cellular viability in lung and cervical cancer cell lines. Here we show a significant reduction in cellular viability in the aforementioned cell lines as a result of the siRNA-mediated downregulation of LRP. This reduction in cellular viability is due to increased apoptotic processes, reflected by the loss of nuclear integrity and the significant increase in the activity of caspase-3. These results indicate that LRP/LR is involved in the maintenance of cellular viability in tumorigenic lung and cervix uteri cells through the blockage of apoptosis. Knockdown of LRP/LR by siRNA might represent an alternative therapeutic strategy for the treatment of lung and cervical cancer.
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Affiliation(s)
- Kiashanee Moodley
- School of Molecular and Cell Biology, University of the Witwatersrand, Johannesburg, Gauteng, The Republic of South Africa
| | - Stefan F. T. Weiss
- School of Molecular and Cell Biology, University of the Witwatersrand, Johannesburg, Gauteng, The Republic of South Africa
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19
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Zidane N, Ould-Abeih MB, Petit-Topin I, Bedouelle H. The folded and disordered domains of human ribosomal protein SA have both idiosyncratic and shared functions as membrane receptors. Biosci Rep 2012; 33:113-24. [PMID: 23137297 DOI: 10.1042/BSR20120103] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
The human RPSA [ribosomal protein SA; also known as LamR1(laminin receptor 1)] belongs to the
ribosome but is also a membrane receptor for laminin, growth factors, prion, pathogens and the
anticarcinogen EGCG (epigallocatechin-gallate). It contributes to the crossing of the
blood–brain barrier by neurotropic viruses and bacteria, and is a biomarker of metastasis.
RPSA includes an N-terminal domain, which is folded and homologous to the prokaryotic RPS2, and a
C-terminal extension, which is intrinsically disordered and conserved in vertebrates. We used
recombinant derivatives of RPSA and its N- and C-domains to quantify its interactions with ligands
by in-vitro immunochemical and spectrofluorimetric methods. Both N- and C-domains
bound laminin with KD (dissociation constants) of 300 nM. Heparin
bound only to the N-domain and competed for binding to laminin with the negatively charged C-domain,
which therefore mimicked heparin. EGCG bound only to the N-domain with a
KD of 100 nM. Domain 3 of the envelope protein from yellow fever
virus and serotypes-1 and -2 of dengue virus bound preferentially to the C-domain whereas that from
West Nile virus bound only to the N-domain. Our quantitative in-vitro approach
should help clarify the mechanisms of action of RPSA, and ultimately fight against cancer and
infectious agents.
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20
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Formisano P, Ragno P, Pesapane A, Alfano D, Alberobello AT, Rea VEA, Giusto R, Rossi FW, Beguinot F, Rossi G, Montuori N. PED/PEA-15 interacts with the 67 kD laminin receptor and regulates cell adhesion, migration, proliferation and apoptosis. J Cell Mol Med 2012; 16:1435-46. [PMID: 21895963 PMCID: PMC3823213 DOI: 10.1111/j.1582-4934.2011.01411.x] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022] Open
Abstract
Phosphoprotein enriched in diabetes/phosphoprotein enriched in astrocytes-15 kD (PED/PEA-15) is an anti-apoptotic protein whose expression is increased in several human cancers. In addition to apoptosis, PED/PEA-15 is involved in the regulation of other major cellular functions, including cell adhesion, migration, proliferation and glucose metabolism. To further understand the functions of this protein, we performed a yeast two-hybrid screening using PED/PEA-15 as a bait and identified the 67 kD high-affinity laminin receptor (67LR) as an interacting partner. 67 kD laminin receptor is a non-integrin cell-surface receptor for the extracellular matrix (ECM), derived from the dimerization of a 37 kD cytosolic precursor (37LRP). The 67LR is highly expressed in human cancers and widely recognized as a molecular marker of metastatic aggressiveness. The molecular interaction of PED/PEA-15 with 67LR was confirmed by pull-down experiments with recombinant His-tagged 37LRP on lysates of PED/PEA-15 transfected HEK-293 cells. Further, overexpressed or endogenous PED/PEA-15 was co-immunoprecipitated with 67LR in PED/PEA-15-transfected HEK-293 cells and in U-373 glioblastoma cells, respectively. PED/PEA-15 overexpression significantly increased 67LR-mediated HEK-293 cell adhesion and migration to laminin that, in turn, determined PED/PEA-15 phosphorylation both in Ser-104 and Ser-116, thus enabling cell proliferation and resistance to apoptosis. PED/PEA-15 ability to induce cell responses to ECM-derived signals through interaction with 67LR may be of crucial importance for tumour cell survival in a poor microenvironment, thus favouring the metastatic spread and colonization.
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Affiliation(s)
- Pietro Formisano
- Department of Cellular and Molecular Biology and Pathology, Federico II University, Naples, taly
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21
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Abstract
Human nonintegrin laminin receptor is a multifunctional protein acting as an integral component of the ribosome and a cell surface receptor for laminin-1. The laminin receptor is overexpressed in several human cancers and is also the cell surface receptor for several viruses and pathogenic prion proteins, making it a pathologically significant protein. This study focused on the proteomic characterization of laminin receptor interacting proteins from Mus musculus. The use of affinity chromatography with immobilized recombinant laminin receptor coupled with mass spectrometry analysis identified 45 proteins with high confidence. Following validation through coimmunoprecipitation, the proteins were classified based on predicted function into ribosomal, RNA processing, signal transduction/metabolism, protein processing, cytoskeleton/cell anchorage, DNA/chromatin, and unknown functions. A significant portion of the identified proteins is related to functions or localizations previously described for laminin receptor. This work represents a comprehensive proteomic approach to studying laminin receptor and provides an essential stepping stone to a better mechanistic understanding of this protein's diverse functions.
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Affiliation(s)
- Lisa Venticinque
- Gene Therapy Center, Cancer Institute and Department of Pathology, New York University School of Medicine, 550 First Avenue, New York, NY 10016
| | - Daniel Meruelo
- Gene Therapy Center, Cancer Institute and Department of Pathology, New York University School of Medicine, 550 First Avenue, New York, NY 10016
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Abouseada NM, Assafi MS, Mahdavi J, Oldfield NJ, Wheldon LM, Wooldridge KG, Ala'Aldeen DA. Mapping the laminin receptor binding domains of Neisseria meningitidis PorA and Haemophilus influenzae OmpP2. PLoS One 2012; 7:e46233. [PMID: 23049988 DOI: 10.1371/journal.pone.0046233] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2012] [Accepted: 08/28/2012] [Indexed: 12/31/2022] Open
Abstract
Neisseria meningitidis, Haemophilus influenzae and Streptococcus pneumoniae are major bacterial agents of meningitis. They each bind the 37/67-kDa laminin receptor (LamR) via the surface protein adhesins: meningococcal PilQ and PorA, H. influenzae OmpP2 and pneumococcal CbpA. We have previously reported that a surface-exposed loop of the R2 domain of CbpA mediates LamR-binding. Here we have identified the LamR-binding regions of PorA and OmpP2. Using truncated recombinant proteins we show that binding is dependent on amino acids 171-240 and 91-99 of PorA and OmpP2, respectively, which are predicted to localize to the fourth and second surface-exposed loops, respectively, of these proteins. Synthetic peptides corresponding to the loops bound LamR and could block LamR-binding to bacterial ligands in a dose dependant manner. Meningococci expressing PorA lacking the apex of loop 4 and H. influenzae expressing OmpP2 lacking the apex of loop 2 showed significantly reduced LamR binding. Since both loops are hyper-variable, our data may suggest a molecular basis for the range of LamR-binding capabilities previously reported among different meningococcal and H. influenzae strains.
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23
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Kim DG, Choi JW, Lee JY, Kim H, Oh YS, Lee JW, Tak YK, Song JM, Razin E, Yun S, Kim S. Interaction of two translational components, lysyl‐tRNA synthetase and p40/37LRP, in plasma membrane promotes laminin‐dependent cell migration. FASEB J 2012; 26:4142-59. [DOI: 10.1096/fj.12-207639] [Citation(s) in RCA: 69] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
- Dae Gyu Kim
- Medicinal Bioconvergence Research CenterSeoul National UniversitySeoulKorea
- College of PharmacySeoul National UniversitySeoulKorea
| | - Jin Woo Choi
- Medicinal Bioconvergence Research CenterSeoul National UniversitySeoulKorea
- Wellman Center for PhotomedicineMassachusetts General Hospital, Harvard Medical SchoolBostonMassachusettsUSA
| | - Jin Young Lee
- Medicinal Bioconvergence Research CenterSeoul National UniversitySeoulKorea
- College of PharmacySeoul National UniversitySeoulKorea
| | - Hyerim Kim
- Medicinal Bioconvergence Research CenterSeoul National UniversitySeoulKorea
| | - Young Sun Oh
- Medicinal Bioconvergence Research CenterSeoul National UniversitySeoulKorea
| | - Jung Weon Lee
- Medicinal Bioconvergence Research CenterSeoul National UniversitySeoulKorea
- College of PharmacySeoul National UniversitySeoulKorea
- World Class UniversityDepartment of Molecular Medicine and Biopharmaceutical SciencesSeoul National UniversitySeoulKorea
| | - Yu Kyung Tak
- Medicinal Bioconvergence Research CenterSeoul National UniversitySeoulKorea
- World Class UniversityDepartment of Molecular Medicine and Biopharmaceutical SciencesSeoul National UniversitySeoulKorea
| | - Joon Myong Song
- Medicinal Bioconvergence Research CenterSeoul National UniversitySeoulKorea
- World Class UniversityDepartment of Molecular Medicine and Biopharmaceutical SciencesSeoul National UniversitySeoulKorea
| | - Ehud Razin
- Department of Biochemistry and Molecular BiologyThe Hebrew University‐Hadassah Medical SchoolJerusalemIsrael
| | - Seok‐Hyun Yun
- Wellman Center for PhotomedicineMassachusetts General Hospital, Harvard Medical SchoolBostonMassachusettsUSA
| | - Sunghoon Kim
- Medicinal Bioconvergence Research CenterSeoul National UniversitySeoulKorea
- College of PharmacySeoul National UniversitySeoulKorea
- World Class UniversityDepartment of Molecular Medicine and Biopharmaceutical SciencesSeoul National UniversitySeoulKorea
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24
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Ould-Abeih MB, Petit-Topin I, Zidane N, Baron B, Bedouelle H. Multiple Folding States and Disorder of Ribosomal Protein SA, a Membrane Receptor for Laminin, Anticarcinogens, and Pathogens. Biochemistry 2012; 51:4807-21. [DOI: 10.1021/bi300335r] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Mohamed B. Ould-Abeih
- Institut Pasteur, Unit of Molecular Prevention and
Therapy of Human Diseases, Department
of Infection and Epidemiology, rue du Dr. Roux, F-75015 Paris, France
- CNRS, URA3012, rue du Dr. Roux, F-75015 Paris, France
- Université Paris Diderot, Sorbonne Paris Cité, Cellule Pasteur,
rue du Dr. Roux, F-75015 Paris, France
| | - Isabelle Petit-Topin
- Institut Pasteur, Unit of Molecular Prevention and
Therapy of Human Diseases, Department
of Infection and Epidemiology, rue du Dr. Roux, F-75015 Paris, France
- CNRS, URA3012, rue du Dr. Roux, F-75015 Paris, France
| | - Nora Zidane
- Institut Pasteur, Unit of Molecular Prevention and
Therapy of Human Diseases, Department
of Infection and Epidemiology, rue du Dr. Roux, F-75015 Paris, France
- CNRS, URA3012, rue du Dr. Roux, F-75015 Paris, France
| | - Bruno Baron
- Institut Pasteur, Plate-forme
de Biophysique des Macromolécules et de leurs
Interactions, Department of Structural Biology and Chemistry, rue
du Dr. Roux, F-75015 Paris, France
- CNRS, UMR3528, rue du Dr. Roux, 75015
Paris, France
| | - Hugues Bedouelle
- Institut Pasteur, Unit of Molecular Prevention and
Therapy of Human Diseases, Department
of Infection and Epidemiology, rue du Dr. Roux, F-75015 Paris, France
- CNRS, URA3012, rue du Dr. Roux, F-75015 Paris, France
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25
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Fujimura Y, Sumida M, Sugihara K, Tsukamoto S, Yamada K, Tachibana H. Green tea polyphenol EGCG sensing motif on the 67-kDa laminin receptor. PLoS One 2012; 7:e37942. [PMID: 22666419 PMCID: PMC3362541 DOI: 10.1371/journal.pone.0037942] [Citation(s) in RCA: 61] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2012] [Accepted: 04/25/2012] [Indexed: 12/31/2022] Open
Abstract
Background We previously identified the 67-kDa laminin receptor (67LR) as the cell-surface receptor conferring the major green tea polyphenol (–)-epigallocatechin-3-O-gallate (EGCG) responsiveness to cancer cells. However, the underlying mechanism for interaction between EGCG and 67LR remains unclear. In this study, we investigated the possible role of EGCG-67LR interaction responsible for its bioactivities. Methodology/Principal Findings We synthesized various peptides deduced from the extracellular domain corresponding to the 102-295 region of human 67LR encoding a 295-amino acid. The neutralizing activity of these peptides toward EGCG cell-surface binding and inhibition of cancer cell growth were assayed. Both activities were inhibited by a peptide containing the 10-amino acid residues, IPCNNKGAHS, corresponding to residues 161-170. Furthermore, mass spectrometric analysis revealed the formation of a EGCG-LR161-170 peptide complex. A study of the amino acid deletion/replacement of the peptide LR161-170 indicated that the 10-amino acid length and two basic amino acids, K166 and H169, have a critical role in neutralizing EGCG’s activities. Moreover, neutralizing activity against the anti-proliferation action of EGCG was observed in a recombinant protein of the extracellular domain of 67LR, and this effect was abrogated by a deletion of residues 161-170. These findings support that the 10 amino-acid sequence, IPCNNKGAHS, might be the functional domain responsible for the anti-cancer activity of EGCG. Conclusions/Significance Overall, our results highlight the nature of the EGCG-67LR interaction and provide novel structural insights into the understanding of 67LR-mediated functions of EGCG, and could aid in the development of potential anti-cancer compounds for chemopreventive or therapeutic uses that can mimic EGCG-67LR interactions.
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Affiliation(s)
- Yoshinori Fujimura
- Innovation Center for Medical Redox Navigation, Kyushu University, Fukuoka, Japan
| | - Mami Sumida
- Department of Bioscience and Biotechnology, Faculty of Agriculture, Fukuoka, Japan
| | - Kaori Sugihara
- Department of Bioscience and Biotechnology, Faculty of Agriculture, Fukuoka, Japan
| | - Shuntaro Tsukamoto
- Department of Bioscience and Biotechnology, Faculty of Agriculture, Fukuoka, Japan
| | - Koji Yamada
- Department of Bioscience and Biotechnology, Faculty of Agriculture, Fukuoka, Japan
| | - Hirofumi Tachibana
- Innovation Center for Medical Redox Navigation, Kyushu University, Fukuoka, Japan
- Department of Bioscience and Biotechnology, Faculty of Agriculture, Fukuoka, Japan
- Bio-Architecture Center, Kyushu University, Fukuoka, Japan
- * E-mail:
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26
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Scheiman J, Jamieson KV, Ziello J, Tseng JC, Meruelo D. Extraribosomal functions associated with the C terminus of the 37/67 kDa laminin receptor are required for maintaining cell viability. Cell Death Dis 2010; 1:e42. [PMID: 21243100 DOI: 10.1038/cddis.2010.19] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
The 37/67 kDa laminin receptor (LAMR) is a multifunctional protein, acting as an extracellular receptor, localizing to the nucleus, and playing roles in rRNA processing and ribosome assembly. LAMR is important for cell viability; however, it is unclear which of its functions are essential. We developed a silent mutant LAMR construct, resistant to siRNA, to rescue the phenotypic effects of knocking down endogenous LAMR, which include inhibition of protein synthesis, cell cycle arrest, and apoptosis. In addition, we generated a C-terminal-truncated silent mutant LAMR construct structurally homologous to the Archaeoglobus fulgidus S2 ribosomal protein and missing the C-terminal 75 residues of LAMR, which displays more sequence divergence. We found that HT1080 cells stably expressing either silent mutant LAMR construct still undergo arrest in the G1 phase of the cell cycle when treated with siRNA. However, the expression of full-length silent mutant LAMR rescues cell viability, whereas the expression of the C-terminal-truncated LAMR does not. Interestingly, we also found that both silent mutant constructs restore protein translation and localize to the nucleus. Our findings indicate that the ability of LAMR to regulate viability is associated with its C-terminal 75 residues. Furthermore, this function is distinct from its role in cell proliferation, independent of its ribosomal functions, and may be regulated by a nonnuclear localization.
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27
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Venticinque L, Jamieson KV, Meruelo D. Interactions between laminin receptor and the cytoskeleton during translation and cell motility. PLoS One 2011; 6:e15895. [PMID: 21249134 PMCID: PMC3017552 DOI: 10.1371/journal.pone.0015895] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2010] [Accepted: 11/30/2010] [Indexed: 11/19/2022] Open
Abstract
Human laminin receptor acts as both a component of the 40S ribosomal subunit to mediate cellular translation and as a cell surface receptor that interacts with components of the extracellular matrix. Due to its role as the cell surface receptor for several viruses and its overexpression in several types of cancer, laminin receptor is a pathologically significant protein. Previous studies have determined that ribosomes are associated with components of the cytoskeleton, however the specific ribosomal component(s) responsible has not been determined. Our studies show that laminin receptor binds directly to tubulin. Through the use of siRNA and cytoskeletal inhibitors we demonstrate that laminin receptor acts as a tethering protein, holding the ribosome to tubulin, which is integral to cellular translation. Our studies also show that laminin receptor is capable of binding directly to actin. Through the use of siRNA and cytoskeletal inhibitors we have shown that this laminin receptor-actin interaction is critical for cell migration. These data indicate that interactions between laminin receptor and the cytoskeleton are vital in mediating two processes that are intimately linked to cancer, cellular translation and migration.
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Affiliation(s)
- Lisa Venticinque
- Gene Therapy Center, Cancer Institute and Department of Pathology, New York University School of Medicine, New York, New York, United States of America
| | - Kelly V. Jamieson
- Gene Therapy Center, Cancer Institute and Department of Pathology, New York University School of Medicine, New York, New York, United States of America
| | - Daniel Meruelo
- Gene Therapy Center, Cancer Institute and Department of Pathology, New York University School of Medicine, New York, New York, United States of America
- * E-mail:
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Abstract
Green tea polyphenols have emerged over the past two decades as an important dietary factor for health promotion. There is considerable evidence that tea polyphenols, in particular (-)-epigallocatechin-3-gallate (EGCG) inhibit carcinogenesis. However, the mechanisms for the cancer-preventive activity of EGCG are not completely characterized and many features remain to be elucidated. Recently we have identified a cell-surface EGCG receptor and the relating molecules that confer EGCG responsiveness to many cancer cells at physiological concentrations. Here, we review some of the reported mechanisms for the cancer chemopreventive action of EGCG and provide an overview of several molecules that sense and manage the physiological functions of EGCG.
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Affiliation(s)
- Hirofumi Tachibana
- Department of Bioscience and Biotechnology, Faculty of Agriculture, Kyushu University, Fukuoka, Japan.
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Omar A, Jovanovic K, Da Costa Dias B, Gonsalves D, Moodley K, Caveney R, Mbazima V, Weiss SFT. Patented biological approaches for the therapeutic modulation of the 37 kDa/67 kDa laminin receptor. Expert Opin Ther Pat 2010; 21:35-53. [DOI: 10.1517/13543776.2011.539203] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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30
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Zhu L, Pearce D, Kim KS. Prevention of Escherichia coli K1 penetration of the blood-brain barrier by counteracting the host cell receptor and signaling molecule involved in E. coli invasion of human brain microvascular endothelial cells. Infect Immun 2010; 78:3554-9. [PMID: 20515928 PMCID: PMC2916274 DOI: 10.1128/iai.00336-10] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2010] [Revised: 05/06/2010] [Accepted: 05/21/2010] [Indexed: 11/20/2022] Open
Abstract
Escherichia coli meningitis is an important cause of mortality and morbidity, and a key contributing factor is our incomplete understanding of the pathogenesis of E. coli meningitis. We have shown that E. coli penetration into the brain requires E. coli invasion of human brain microvascular endothelial cells (HBMEC), which constitute the blood-brain barrier. E. coli invasion of HBMEC involves its interaction with HBMEC receptors, such as E. coli cytotoxic necrotizing factor 1 (CNF1) interaction with its receptor, the 67-kDa laminin receptor (67LR), and host signaling molecules including cytosolic phospholipase A(2)alpha (cPLA(2)alpha). In the present study, we showed that treatment with etoposide resulted in decreased expression of 67LR on HBMEC and inhibited E. coli invasion of HBMEC. Pharmacological inhibition of cysteinyl leukotrienes, lipoxygenated products of arachidonic acid released by cPLA(2)alpha, using montelukast (an antagonist of the type 1 cysteinyl leukotriene receptor) also inhibited E. coli invasion of HBMEC. E. coli penetration into the brain was significantly decreased by etoposide as well as by montelukast, and a combination of etoposide and montelukast was significantly more effective in inhibiting E. coli K1 invasion of HBMEC than single agents alone. These findings demonstrate for the first time that counteracting the HBMEC receptor and signaling molecule involved in E. coli invasion of HBMEC provides a novel approach for prevention of E. coli penetration into the brain, the essential step required for development of E. coli meningitis.
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Affiliation(s)
- Longkun Zhu
- Department of Pediatrics, Division of Pediatric Infectious Diseases, Johns Hopkins University School of Medicine, 200 North Wolfe Street, Room 3157, Baltimore, Maryland 21287
| | - Donna Pearce
- Department of Pediatrics, Division of Pediatric Infectious Diseases, Johns Hopkins University School of Medicine, 200 North Wolfe Street, Room 3157, Baltimore, Maryland 21287
| | - Kwang Sik Kim
- Department of Pediatrics, Division of Pediatric Infectious Diseases, Johns Hopkins University School of Medicine, 200 North Wolfe Street, Room 3157, Baltimore, Maryland 21287
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Mathew S, Fu L, Hasebe T, Ishizuya-Oka A, Shi YB. Tissue-dependent induction of apoptosis by matrix metalloproteinase stromelysin-3 during amphibian metamorphosis. Birth Defects Res C Embryo Today 2010; 90:55-66. [PMID: 20301218 PMCID: PMC3412310 DOI: 10.1002/bdrc.20170] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Matrix metalloproteinases (MMPs) are a superfamily of Zn(2+)-dependent proteases that are capable of cleaving the proteinaceous component of the extracellular matrix (ECM). The ECM is a critical medium for cell-cell interactions and can also directly signal cells through cell surface ECM receptors, such as integrins. In addition, many growth factors and signaling molecules are stored in the ECM. Thus, ECM remodeling and/or degradation by MMPs are expected to affect cell fate and behavior during many developmental and pathological processes. Numerous studies have shown that the expression of MMP mRNAs and proteins associates tightly with diverse developmental and pathological processes, such as tumor metastasis and mammary gland involution. In vivo evidence to support the roles of MMPs in these processes has been much harder to get. Here, we will review some of our studies on MMP11, or stromelysin-3, during the thyroid hormone-dependent amphibian metamorphosis, a process that resembles the so-called postembryonic development in mammals (from a few months before to several months after birth in humans when organ growth and maturation take place). Our investigations demonstrate that stromelysin-3 controls apoptosis in different tissues via at least two distinct mechanisms.
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Affiliation(s)
- Smita Mathew
- Section on Molecular Morphogenesis, Laboratory of Gene Regulation and Development, Program in Cellular Regulation and Metabolism (PCRM), Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD), National Institutes of Health (NIH), Bethesda, Maryland, 20892
| | - Liezhen Fu
- Section on Molecular Morphogenesis, Laboratory of Gene Regulation and Development, Program in Cellular Regulation and Metabolism (PCRM), Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD), National Institutes of Health (NIH), Bethesda, Maryland, 20892
| | - Takashi Hasebe
- Department of Biology, Nippon Medical School, Kawasaki, Kanagawa 211-0063, Japan
| | - Atsuko Ishizuya-Oka
- Department of Biology, Nippon Medical School, Kawasaki, Kanagawa 211-0063, Japan
| | - Yun-Bo Shi
- Section on Molecular Morphogenesis, Laboratory of Gene Regulation and Development, Program in Cellular Regulation and Metabolism (PCRM), Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD), National Institutes of Health (NIH), Bethesda, Maryland, 20892
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Malygin AA, Bondarenko EI, Ivanisenko VA, Protopopova EV, Karpova GG, Loktev VB. C-terminal fragment of human laminin-binding protein contains a receptor domain for Venezuelan equine encephalitis and tick-borne encephalitis viruses. Biochemistry Moscow 2010; 74:1328-36. [DOI: 10.1134/s0006297909120050] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Hu J, Ding N, Teng J, Chen J. FAAP is Involved in Cell Attachment*]]>: . PROG BIOCHEM BIOPHYS 2009;36:88-94. [DOI: 10.3724/sp.j.1206.2008.00344] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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34
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Baloui H, Stettler O, Weiss S, Nothias F, von Boxberg Y. Upregulation in rat spinal cord microglia of the nonintegrin laminin receptor 37 kDa-LRP following activation by a traumatic lesion or peripheral injury. J Neurotrauma 2009; 26:195-207. [PMID: 19196078 DOI: 10.1089/neu.2008.0677] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
The molecular mechanisms triggering microglial activation after injury to the central nervous system, involving cell-extracellular matrix interactions and cytokine signaling, are not yet fully understood. Here, we report that resident microglia in spinal cord express low levels of the non-integrin laminin receptor precursor (LRP), also found on certain neurons and glial cells in the peripheral nervous system. 37LRP/p40 and its 67-kDa isoform laminin receptor (LR) were the first high-affinity laminin binding proteins identified. While the role of laminin receptor was later attributed to integrins, LRP/LR gained new interest as receptors for prions, and their interaction with laminin seems important for migration of metastatic cancer cells. Using immunohistochemistry and Western blotting, we demonstrate that traumatic spinal cord injury leads to a strong and rapid increase in LRP levels in relation to activated microglia/macrophages. Associated with laminin re-expression in the lesion epicenter, LRP-positive microglia/macrophages exhibit a rounded, ameboid-like shape characteristic of phagocytic cells, whereas in more distant loci they reveal a hypertrophied cell body and short ramifications. The same morphological difference is observed in vitro for purified microglia cultured with or without laminin. Strong, transient upregulation of LRP by activated spinal cord microglia is also induced by transection of the sciatic nerve that affects the spinal cord circuitry without blood-brain barrier dysruption. LRP expression is maximal by 1 week post-lesion, before becoming restricted to dorsal and ventral horns, sites of major structural reorganization. Our findings strongly suggest the involvement of LRP in lesion-induced activation and migration of microglia.
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Affiliation(s)
- Hasna Baloui
- Université Pierre et Marie Curie-Paris6, UMR7101 NSI; and CNRS, UMR7101 IFR-83, Paris, France
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35
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Fatehullah A, Doherty C, Pivato G, Allen G, Devine L, Nelson J, Timson DJ. Interactions of the 67 kDa laminin receptor and its precursor with laminin. Biosci Rep 2009; 30:73-9. [PMID: 19691449 DOI: 10.1042/BSR20090023] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
The 67LR (67 kDa laminin receptor) enables cells to interact with components of the extracellular matrix. The molecule is derived from the 37LRP (37 kDa laminin receptor precursor); however, the precise molecular mechanism of this conversion is unknown. Recombinant 37LRP, expressed in and purified from Escherichia coli, bound to human laminin in a SPR (surface plasmon resonance) experiment. 67LR isolated from human breast-cancer-derived cells in culture was also shown to bind to laminin by SPR. However, the kinetics of association are qualitatively different. 37LRP, but not 67LR, binds to heparan sulfate. The binding of 37LRP to heparan sulfate did not affect the interaction of 37LRP with laminin. In contrast, heparan sulfate reduces the extent of binding of laminin to 67LR. Taken together, these results show that 37LRP has some of the biological activities of 67LR, even prior to the conversion event. However, the conversion affects the sites of interaction with both laminin and heparan sulfate.
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36
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Scheiman J, Tseng JC, Zheng Y, Meruelo D. Multiple functions of the 37/67-kd laminin receptor make it a suitable target for novel cancer gene therapy. Mol Ther 2010; 18:63-74. [PMID: 19724263 DOI: 10.1038/mt.2009.199] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
The 37/67-kd laminin receptor, LAMR, is a multifunctional protein that associates with the 40S ribosomal subunit and also localizes to the cell membrane to interact with the extracellular matrix. LAMR is overexpressed in many types of cancer, playing important roles in tumor-cell migration and invasion. Here, we show that LAMR is also vital for tumor-cell proliferation, survival, and protein translation. Small-interfering RNA (siRNA)-mediated reduction in expression of LAMR leads to G1 phase cell-cycle arrest in vitro by altering cyclins A2/B1, cyclin-dependent kinases (CDKs) 1/2, Survivin, and p21 expression levels. In vivo, reduction in LAMR expression results in inhibition of HT1080 cells to develop tumors. We also found that LAMR's ribosomal functions are critical for translation as reduction in LAMR expression leads to a dramatic decrease in newly synthesized proteins. Further, cells with lower expression of LAMR have fewer 40S subunits and 80S monosomes, causing an increase in free 60S ribosomal subunits. These results indicate that LAMR is able to regulate tumor development in many ways; further enhancing its potential as a target for gene therapy. To test this, we developed a novel Sindbis/Lenti pseudotype vector carrying short-hairpin RNA (shRNA) designed against lamr. This pseudotype vector effectively reduces LAMR expression and specifically targets tumors in vivo. Treatment of tumor-bearing severe combine immunodeficient (SCID) mice with this pseudotype vector significantly inhibits tumor growth. Thus, we show that LAMR can be used as a target in novel therapy for tumor reduction and elimination.
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37
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Fiorentino M, Fu L, Shi YB. Mutational analysis of the cleavage of the cancer-associated laminin receptor by stromelysin-3 reveals the contribution of flanking sequences to site recognition and cleavage efficiency. Int J Mol Med 2009; 23:389-97. [PMID: 19212658 DOI: 10.3892/ijmm_00000143] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The matrix metalloproteinase stromelysin-3 (ST3) has long been implicated to play an important role in cell fate determination during normal and pathological processes. Using the thyroid hormone-dependent Xenopus laevis metamorphosis as a model, we have previously shown that ST3 is required for apoptosis during intestinal remodeling and that laminin receptor (LR) is an in vivo substrate of ST3 during this process. ST3 cleaves LR at two distinct sites that are conserved in mammalian LR. Human ST3 and LR are both associated with tumor development and cancer progression and human LR can also be cleaved by ST3, implicating a role of LR cleavage by ST3 in human cancers. Here, we carried out a series of mutational analyses on the two cleavage sites in LR. Our findings revealed that in addition to primary sequence at the cleavage site (positions P3-P3', with the cleavage occurring between P1-P1'), flanking sequences/conformation also influenced the cleavage of LR by ST3. Furthermore, alanine substitution studies led to a surprising finding that surrounding sequence and/or conformation dictated the site of cleavage in LR by ST3. These results thus have important implications in our understanding of substrate recognition and cleavage by ST3 and argue for the importance of studying ST3 cleavage in the context of full-length substrates. Furthermore, the LR cleavage mutants generated here will also be valuable tools for future studies on the role of LR cleavage by ST3 in vertebrate development and cancer progression.
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Affiliation(s)
- Maria Fiorentino
- Section on Molecular Morphogenesis, Laboratory of Gene Regulation and Development, PCRM, NICHD, NIH, Bethesda, MD 20892, USA
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38
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Barsoum AL, Liu B, Rohrer JW, Coggin JH, Tucker JA, Pannell LK, Schwarzenberger PO. Production, safety and antitumor efficacy of recombinant Oncofetal Antigen/immature laminin receptor protein. Biomaterials 2009; 30:3091-9. [PMID: 19268360 DOI: 10.1016/j.biomaterials.2009.02.022] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2008] [Accepted: 02/14/2009] [Indexed: 11/30/2022]
Abstract
We describe here for the first time an efficient high yield production method for clinical grade recombinant human Oncofetal Antigen/immature laminin receptor protein (OFA/iLRP). We also demonstrate significant antitumor activity for this protein when administered in liposomal delivery form in a murine model of syngeneic fibrosarcoma. OFA/iLRP is a therapeutically very promising universal tumor antigen that is expressed in all mammalian solid tumors tested so far. We have cloned the human OFA/iLRP cDNA in a bacterial expression plasmid which incorporates a 6x HIS-tag. Large scale cultures of the plasmid transformed Escherichia coli were performed and the crude HIS-tagged OFA/iLRP was isolated as inclusion bodies and solubilized in guanidine chloride. The protein was then purified by successive passage through three column chromatography steps of immobilized metal affinity, anion exchange, and gel filtration. The resulting protein was 94% pure and practically devoid of endotoxin and host cell protein. The purified OFA/iLRP was tested in mice for safety and efficacy in tumor rejection with satisfactory results. This protein will be used for loading onto autologous dendritic cells in an FDA approved phase I/II human cancer vaccine trial in OFA/iLRP-positive breast cancer patients.
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Affiliation(s)
- Adel L Barsoum
- Department of Microbiology and Immunology, College of Medicine, University of South Alabama, Mobile, AL 36688, USA.
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40
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Nelson J, McFerran NV, Pivato G, Chambers E, Doherty C, Steele D, Timson DJ. The 67 kDa laminin receptor: structure, function and role in disease. Biosci Rep 2008; 28:33-48. [PMID: 18269348 DOI: 10.1042/BSR20070004] [Citation(s) in RCA: 136] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
The 67LR (67 kDa laminin receptor) is a cell-surface receptor with high affinity for its primary ligand. Its role as a laminin receptor makes it an important molecule both in cell adhesion to the basement membrane and in signalling transduction following this binding event. The protein also plays critical roles in the metastasis of tumour cells. Isolation of the protein from either normal or cancerous cells results in a product with an approx. molecular mass of 67 kDa. This protein is believed to be derived from a smaller precursor, the 37LRP (37 kDa laminin receptor precursor). However, the precise mechanism by which cytoplasmic 37LRP becomes cell-membrane-embedded 67LR is unclear. The process may involve post-translational fatty acylation of the protein combined with either homo- or hetero-dimerization, possibly with a galectin-3-epitope-containing partner. Furthermore, it has become clear that acting as a receptor for laminin is not the only function of this protein. 67LR also acts as a receptor for viruses, such as Sindbis virus and dengue virus, and is involved with internalization of the prion protein. Interestingly, unmodified 37LRP is a ribosomal component and homologues of this protein are found in all five kingdoms. In addition, it appears to be strongly associated with histones in the eukaryotic cell nucleus, although the precise role of these interactions is not clear. Here we review the current understanding of the structure and function of this molecule, as well as highlighting areas requiring further research.
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Zhang LC, Yu HN, Sun SL, Yang JG, He GQ, Ruan H, Shen SR. Investigations of the cytotoxicity of epigallocatechin-3-gallate against PC-3 cells in the presence of Cd2+ in vitro. Toxicol In Vitro 2008; 22:953-60. [PMID: 18359184 DOI: 10.1016/j.tiv.2008.02.005] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2007] [Revised: 01/18/2008] [Accepted: 02/04/2008] [Indexed: 11/22/2022]
Abstract
The epidemiological studies and recent data have provided convinced evidence that green tea and its major constituent epigallocatechin gallate (EGCG) might have the potential to lower the risk of cancers in humans. Metal ions, such as zinc and cadmium, which are necessary to our health, are important factors inducing many diseases including prostate cancer in the condition of absence or excess. EGCG can satisfactorily exhibit complex chemistry with metal ions because of multiple hydroxyl states, which in turn changes their bioactivities and metabolism pathways. This paper presents the results of an investigation of the cytotoxicity of EGCG against PC-3 prostate cancer cells in the presence and absence of Cd2+ in vitro. The results showed that both EGCG and Cd2+ suppressed viability and clonegenecity of PC-3 cells, and the suppression effect was enhanced when EGCG added with Cd2+. Although Cd2+ up-regulated the 67 kDa laminin receptor (67LR), which is a migration-associated protein, the cell migration ability was not significantly increased after each treatment. We also found that EGCG and Cd2+ directly interacted with mitochondrial, and the mixture of EGCG and Cd2+ (EGCG+Cd2+) significantly caused loss of the mitochondrial membrane potential, decrease of the ATP content and activation of caspase-9 compared with EGCG treated alone. Taken together, these findings suggest that Cd2+ enhanced the cytotoxicity of EGCG to PC-3 cells by up-regulating the 67LR and the mitochondria-mediated apoptosis pathway.
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Marcos-Carcavilla A, Calvo JH, González C, Serrano C, Moazami-Goudarzi K, Laurent P, Bertaud M, Hayes H, Beattie AE, Lyahyai J, Martín-Burriel I, Torres JM, Serrano M. Structural and functional analysis of the ovine laminin receptor gene (RPSA): Possible involvement of the LRP/LR protein in scrapie response. Mamm Genome 2008; 19:92-105. [PMID: 18202837 DOI: 10.1007/s00335-007-9085-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2007] [Accepted: 11/23/2007] [Indexed: 11/28/2022]
Abstract
Scrapie is a prion disease affecting sheep and goats. Susceptibility to this neurodegenerative disease shows polygenic variance. The involvement of the laminin receptor (LRP/LR) in the metabolism and propagation of prions has previously been demonstrated. In the present work, the ovine laminin receptor gene (RPSA) was isolated, characterized, and mapped to ovine chromosome OAR19q13. Real-time RT-PCR revealed a significant decrease in RPSA mRNA in cerebellum after scrapie infection. Conversely, no differences were detected in other brain regions such as diencephalon and medulla oblongata. Association analysis showed that a polymorphism reflecting the presence of a RPSA pseudogene was overrepresented in a group of sheep resistant to scrapie infection. No amino acid change in the LRP/LR protein was found in the 126 sheep analyzed. However, interesting amino acid positions (241, 272, and 290), which could participate in the species barrier to scrapie and maybe to other transmissible spongiform encephalopathies, were identified by comparing LRP/LR sequences from various mammals with variable levels of resistance to scrapie.
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Affiliation(s)
- Ane Marcos-Carcavilla
- Departamento de Mejora Genética Animal, INIA, Ctra La Coruña Km 7.5, Madrid, 28040, Spain.
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43
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Abstract
The human laminin receptor (LamR) interacts with many ligands, including laminin, prions, Sindbis virus, and the polyphenol (-)-epigallocatechin-3-gallate (EGCG), and has been implicated in a number of diseases. LamR is overexpressed on tumor cells, and targeting LamR elicits anti-cancer effects. Here, we report the crystal structure of human LamR, which provides insights into its function and should facilitate the design of novel therapeutics targeting LamR.
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Affiliation(s)
- Kelly V Jamieson
- Gene Therapy Center, Cancer Institute and Department of Pathology, New York University School of Medicine, New York, New York 10016
| | - Jinhua Wu
- Structural Biology Program, Kimmel Center for Biology and Medicine of the Skirball Institute, and Department of Pharmacology, New York University School of Medicine, New York, New York 10016
| | - Stevan R Hubbard
- Structural Biology Program, Kimmel Center for Biology and Medicine of the Skirball Institute, and Department of Pharmacology, New York University School of Medicine, New York, New York 10016.
| | - Daniel Meruelo
- Gene Therapy Center, Cancer Institute and Department of Pathology, New York University School of Medicine, New York, New York 10016.
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Shi YB, Fu L, Hasebe T, Ishizuya-Oka A. Regulation of extracellular matrix remodeling and cell fate determination by matrix metalloproteinase stromelysin-3 during thyroid hormone-dependent post-embryonic development. Pharmacol Ther 2007; 116:391-400. [PMID: 17919732 DOI: 10.1016/j.pharmthera.2007.07.005] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2007] [Accepted: 07/30/2007] [Indexed: 01/23/2023]
Abstract
Interactions between cells and extracellular matrix (ECM), in particular the basement membrane (BM), are fundamentally important for the regulation of a wide variety of physiological and pathological processes. Matrix metalloproteinases (MMP) play critical roles in ECM remodeling and/or regulation of cell-ECM interactions because of their ability to cleave protein components of the ECM. Of particular interest among MMP is stromelysin-3 (ST3), which was first isolated from a human breast cancer and also shown to be correlated with apoptosis during development and invasion of tumor cells in mammals. We have been using intestinal remodeling during thyroid hormone (TH)-dependent amphibian metamorphosis as a model to study the role of ST3 during post-embryonic tissue remodeling and organ development in vertebrates. This process involves complete degeneration of the tadpole or larval epithelium through apoptosis and de novo development of the adult epithelium. Here, we will first summarize expression studies by us and others showing a tight spatial and temporal correlation of the expression of ST3 mRNA and protein with larval cell death and adult tissue development. We will then review in vitro and in vivo data supporting a critical role of ST3 in TH-induced larval epithelial cell death and ECM remodeling. We will further discuss the potential mechanisms of ST3 function during metamorphosis and its broader implications.
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Affiliation(s)
- Yun-Bo Shi
- Laboratory of Gene Regulation and Development, National Institute of Child Health and Human Development, National Institutes of Health, Building 18T, Room 106, Bethesda, MD 20892, USA.
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Amano T, Fu L, Marshak A, Kwak O, Shi YB. Spatio-temporal regulation and cleavage by matrix metalloproteinase stromelysin-3 implicate a role for laminin receptor in intestinal remodeling during Xenopus laevis metamorphosis. Dev Dyn 2007; 234:190-200. [PMID: 16059908 DOI: 10.1002/dvdy.20511] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Abstract
The 37-kd laminin receptor precursor (LR) was first identified as a 67-kd protein that binds laminin with high affinity. We have recently isolated the Xenopus laevis LR as an in vitro substrate of matrix metalloproteinase stromelysin-3 (ST3), which is highly upregulated during intestinal metamorphosis in Xenopus laevis. Here, we show that LR is expressed in the intestinal epithelium of premetamorphic tadpoles. During intestinal metamorphosis, LR is downregulated in the apoptotic epithelium and concurrently upregulated in the connective tissue but with little expression in the developing adult epithelium. Toward the end of metamorphosis, as adult epithelial cells differentiate, they begin to express LR. Furthermore, LR is cleaved during intestinal remodeling when ST3 is highly expressed or in premetamorphic intestine of transgenic tadpoles overexpressing ST3. These results suggest that LR plays a role in cell fate determination and tissue morphogenesis, in part through its cleavage by ST3. Interestingly, high levels of LR are known to be expressed in tumor cells, which are often surrounded by fibroblasts expressing ST3, suggesting that LR cleavage by ST3 plays a role in both physiological and pathological processes.
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Affiliation(s)
- Tosikazu Amano
- Laboratory of Gene Regulation and Development, National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD 20892, USA
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Vana K, Zuber C, Nikles D, Weiss S. Novel Aspects of Prions, Their Receptor Molecules, and Innovative Approaches for TSE Therapy. Cell Mol Neurobiol 2006; 27:107-28. [PMID: 17151946 DOI: 10.1007/s10571-006-9121-1] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2006] [Accepted: 09/20/2006] [Indexed: 10/23/2022]
Abstract
1. Prion diseases are a group of rare, fatal neurodegenerative diseases, also known as transmissible spongiform encephalopathies (TSEs), that affect both animals and humans and include bovine spongiform encephalopathy (BSE) in cattle, scrapie in sheep, chronic wasting disease (CWD) in deer and elk, and Creutzfeldt-Jakob disease (CJD) in humans. TSEs are usually rapidly progressive and clinical symptoms comprise dementia and loss of movement coordination due to the accumulation of an abnormal isoform (PrP(Sc)) of the host-encoded prion protein (PrP(c)). 2. This article reviews the current knowledge on PrP(c) and PrP(Sc), prion replication mechanisms, interaction partners of prions, and their cell surface receptors. Several strategies, summarized in this article, have been investigated for an effective antiprion treatment including development of a vaccination therapy and screening for potent chemical compounds. Currently, no effective treatment for prion diseases is available. 3. The identification of the 37 kDa/67 kDa laminin receptor (LRP/LR) and heparan sulfate as cell surface receptors for prions, however, opens new avenues for the development of alternative TSE therapies.
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Affiliation(s)
- Karen Vana
- Laboratorium für Molekulare Biologie, Genzentrum, Institut für Biochemie der Ludwig-Maximilians-Universität München, Feodor-Lynen-Str. 25, 81377, München, Germany
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Selleri C, Ragno P, Ricci P, Visconte V, Scarpato N, Carriero MV, Rotoli B, Rossi G, Montuori N. The metastasis-associated 67-kDa laminin receptor is involved in G-CSF–induced hematopoietic stem cell mobilization. Blood 2006; 108:2476-84. [PMID: 16788104 DOI: 10.1182/blood-2005-11-012625] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
AbstractThe 67-kDa laminin receptor (67LR) is a nonintegrin cell-surface receptor with high affinity for laminin, which plays a key role in tumor invasion and metastasis. We investigated the role of 67LR in granulocyte colony-stimulating factor (G-CSF)–induced mobilization of CD34+ hematopoietic stem cells (HSCs) from 35 healthy donors. G-CSF–mobilized HSCs, including CD34+/CD38– cells, showed increased 67LR expression as compared with unstimulated marrow HSCs; noteworthy, also, is the fact that the level of 67LR expression in G-CSF–mobilized HSCs correlated significantly with mobilization efficiency. During G-CSF–induced HSC mobilization, the expression of laminin receptors switched from α6 integrins, which mediated laminin-dependent adhesion of steady-state human marrow HSCs, to 67LR, responsible for G-CSF–mobilized HSC adhesion and migration toward laminin. In vitro G-CSF treatment, alone or combined with exposure to marrow-derived endothelial cells, induced 67LR up-regulation in marrow HSCs; moreover, anti-67LR antibodies significantly inhibited transendothelial migration of G-CSF–stimulated marrow HSCs. Finally, G-CSF–induced mobilization in mice was associated with 67LR up-regulation both in circulating and marrow CD34+ cells, and anti-67LR antibodies significantly reduced HSC mobilization, providing the first in vivo evidence for 67LR involvement in stem-cell egress from bone marrow after G-CSF administration. In conclusion, 67LR up-regulation in G-CSF–mobilized HSCs correlates with their successful mobilization and reflects its increase in marrow HSCs, which contributes to the egress from bone marrow by mediating laminin-dependent cell adhesion and transendothelial migration.
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Affiliation(s)
- Carmine Selleri
- Department of Biochemistry and Medical Biotechnology, Institute of Experimental Endocrinology and Oncology (IEOS), National Research Council (CNR), Via S Pansini 5, 80131, Naples, Italy
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Han YS, Bastianetto S, Dumont Y, Quirion R. Specific Plasma Membrane Binding Sites for Polyphenols, Including Resveratrol, in the Rat Brain. J Pharmacol Exp Ther 2006; 318:238-45. [PMID: 16574779 DOI: 10.1124/jpet.106.102319] [Citation(s) in RCA: 74] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
Abstract
Using [3H]resveratrol (3,5,4'-trihydroxy-trans-stilbene) as radioligand, we investigated the possible existence of specific polyphenol binding sites at the level of the cellular plasma membrane in rat brain. Specific [3H]resveratrol binding sites were found to be enriched in the plasma membrane pellet with lower levels in the nuclear and cell debris fraction. Specific [3H]resveratrol binding to the plasma membrane fraction was sensitive to trypsin digestion and protein denaturation but not to DNase and RNase treatment. Saturation binding experiments revealed that specific [3H]resveratrol recognized a single class of sites with an apparent affinity (KD) of 220+/-45 nM and a maximal capacity (Bmax) of 1060+/-120 fmol/mg protein. Various polyphenols and resveratrol derivatives competed against specific [3H]resveratrol binding in rat brain plasma membrane homogenates with the tea catechin gallates (epigallocatechin gallate and epicatechin gallate) displaying the highest affinities (Ki=25-45 nM) followed by resveratrol (Ki=102 nM). Quantitative autoradiographic studies revealed that specific [3H]resveratrol binding sites are broadly distributed in the rat brain, with highest levels of labeling seen in the choroid plexus and subfornical organ. Finally, the potency of various polyphenols and resveratrol analogs in protecting hippocampal cells against beta-amyloid-induced toxicity correlated well (r=0.74) with their apparent affinity in the [3H]resveratrol binding assay. Taken together, these results suggest that the neuroprotective action of various polyphenols and resveratrol analogs could be mediated by the activation of common "receptor" binding sites particularly enriched at the level of the cellular plasma membrane in the rat brain.
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Affiliation(s)
- Ying-Shan Han
- Douglas Hospital Research Center, Department of Psychiatry, McGill University, 6875 Blvd. LaSalle, Montréal (Verdun), QC H4H 1R3, Canada
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Abstract
OBJECTIVES/HYPOTHESIS Abnormal interaction of epithelial cells with laminin component of basement membrane may account for altered biological behavior of cells, influencing proliferation, adhesion, and motility. In the current study, we investigated the role of 67-kDa laminin receptor (67LR), a high affinity receptor for laminin, in aggressiveness of laryngeal squamous cell carcinoma. METHODS Thirty paraffin-embedded specimens and 20 fresh tissues of patients with laryngeal squamous cell carcinoma were analyzed using immunohistologic and reverse-transcriptase polymerase chain reaction techniques, respectively. Expression of 67LR on the surface of AMC-HN-8 cells was examined by flow cytometry. The effect of 67LR monoclonal antibody (MLuC5) on the adhesive and invasive abilities of AMC-HN-8 cells was determined by adherence and invasion inhibition assay in vitro. RESULTS Both at the mRNA and protein level, laryngeal carcinoma cells expressed higher level of 67LR than normal epithelial cells (P < .01). The expression of 67LR correlated inversely with differentiation extent of tumor (P < .05). 67LR level was significantly increased in patients with lymph node metastases than those without lymph node involvement (P < .05). Flow cytometry showed 80.9 +/- 0.9% of AMC-HN-8 cells expressed 67LR. After 60 minutes and 120 minutes of incubation, MluC5 induced 57.1 +/- 3.6% and 63.2 +/- 2.8% inhibition of adhesion, respectively. The invasive ability of AMC-HN-8 cells to matrigel was reduced by MLuC5. CONCLUSIONS Laryngeal carcinoma cells over-expressing 67LR have a stronger aggressive potential, which might make 67LR a promising target for the treatment of metastatic tumor.
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Affiliation(s)
- Liang Zhou
- Department of Otolaryngology, Eye and ENT Hospital, FuDan University, Shanghai, China.
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Moss BL, Taubner L, Sample YK, Kazmin DA, Copié V, Starkey JR. Tumor shedding of laminin binding protein modulates angiostatin productionin vitro and interferes with plasmin-derived inhibition of angiogenesis in aortic ring cultures. Int J Cancer 2006; 118:2421-32. [PMID: 16380995 DOI: 10.1002/ijc.21674] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
The growth of solid tumors is largely controlled by the process of angiogenesis. A 67 kDa protein, the laminin binding protein (LBP), is shed from malignant cells in significant amounts and binds to laminin-1 (Starkey et al., Cytometry 1999;35:37-47; Karpatová et al., J Cell Biochem 1996;60:226-34). However, the functions of shed LBP are not fully understood. We hypothesize that matrix-bound LBP could modulate local tumor angiogenesis. In support of this hypothesis, we demonstrate that shed LBP exhibits sulfhydryl oxidase-like activities, and modifies the production of angiostatins from plasmin in vitro. The molecular weights of the autocatalytic products of lys-plasmin incubated with LBP in vitro suggest that PMDs (plasmin A chains attached to degraded B chains) (Ohyama et al., Eur J Biochem 2004;271:809-20) are preferentially generated. Using rat aortic ring assays, we also show that shed LBP reverses plasmin-dependent inhibition of vascular outgrowth. To elucidate which LBP region(s) are active in modulating angiogenesis, limited proteolysis experiments were conducted to determine stable rLBP domains likely to fold correctly, and these were cloned, expressed and purified. The stable LBP fragments were tested for binding to laminin-1 and for competition with shed LBP activity in the aortic ring assay. Results of these studies suggest that the active LBP domains lie within the 137-230 amino acid sequence, a region known to contain 2 bioactive sequences. Since this fragment binds to laminin-1 and modulates angiogenesis, it appears likely that binding of shed LBP to matrix laminin-1 is related to its functions in tumor angiogenesis. The findings presented in this manuscript suggest that LBP shedding could provide a useful therapeutic target.
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Affiliation(s)
- Britney L Moss
- Department of Chemistry and Biochemistry, Montana State University, Bozeman, MT 59717, USA
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