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Pampeno C, Hurtado A, Opp S, Meruelo D. Channeling the Natural Properties of Sindbis Alphavirus for Targeted Tumor Therapy. Int J Mol Sci 2023; 24:14948. [PMID: 37834397 PMCID: PMC10573789 DOI: 10.3390/ijms241914948] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2023] [Revised: 09/21/2023] [Accepted: 10/03/2023] [Indexed: 10/15/2023] Open
Abstract
Sindbis alphavirus vectors offer a promising platform for cancer therapy, serving as valuable models for alphavirus-based treatment. This review emphasizes key studies that support the targeted delivery of Sindbis vectors to tumor cells, highlighting their effectiveness in expressing tumor-associated antigens and immunomodulating proteins. Among the various alphavirus vectors developed for cancer therapy, Sindbis-vector-based imaging studies have been particularly extensive. Imaging modalities that enable the in vivo localization of Sindbis vectors within lymph nodes and tumors are discussed. The correlation between laminin receptor expression, tumorigenesis, and Sindbis virus infection is examined. Additionally, we present alternative entry receptors for Sindbis and related alphaviruses, such as Semliki Forest virus and Venezuelan equine encephalitis virus. The review also discusses cancer treatments that are based on the alphavirus vector expression of anti-tumor agents, including tumor-associated antigens, cytokines, checkpoint inhibitors, and costimulatory immune molecules.
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Affiliation(s)
| | | | | | - Daniel Meruelo
- Department of Pathology, NYU Grossman School of Medicine, New York University, New York, NY 10016, USA
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2
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Limone A, Maggisano V, Sarnataro D, Bulotta S. Emerging roles of the cellular prion protein (PrP C) and 37/67 kDa laminin receptor (RPSA) interaction in cancer biology. Cell Mol Life Sci 2023; 80:207. [PMID: 37452879 PMCID: PMC10349719 DOI: 10.1007/s00018-023-04844-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2023] [Revised: 06/16/2023] [Accepted: 06/18/2023] [Indexed: 07/18/2023]
Abstract
The cellular prion protein (PrPC) is well-known for its involvement, under its pathogenic protease-resistant form (PrPSc), in a group of neurodegenerative diseases, known as prion diseases. PrPC is expressed in nervous system, as well as in other peripheral organs, and has been found overexpressed in several types of solid tumors. Notwithstanding, studies in recent years have disclosed an emerging role for PrPC in various cancer associated processes. PrPC has high binding affinity for 37/67 kDa laminin receptor (RPSA), a molecule that acts as a key player in tumorigenesis, affecting cell growth, adhesion, migration, invasion and cell death processes. Recently, we have characterized at cellular level, small molecules able to antagonize the direct PrPC binding to RPSA and their intracellular trafficking. These findings are very crucial considering that the main function of RPSA is to modulate key events in the metastasis cascade. Elucidation of the role played by PrPC/RPSA interaction in regulating tumor development, progression and response to treatment, represents a very promising challenge to gain pathogenetic information and discover novel specific biomarkers and/or therapeutic targets to be exploited in clinical settings. This review attempts to convey a detailed description of the complexity surrounding these multifaceted proteins from the perspective of cancer hallmarks, but with a specific focus on the role of their interaction in the control of proliferation, migration and invasion, genome instability and mutation, as well as resistance to cell death controlled by autophagic pathway.
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Affiliation(s)
- Adriana Limone
- Department of Molecular Medicine and Medical Biotechnology, University of Naples "Federico II", Via Pansini 5, 80131, Naples, Italy
| | - Valentina Maggisano
- Department of Health Sciences, University "Magna Graecia" of Catanzaro, Campus "S. Venuta", 88100, Catanzaro, Italy
| | - Daniela Sarnataro
- Department of Molecular Medicine and Medical Biotechnology, University of Naples "Federico II", Via Pansini 5, 80131, Naples, Italy.
| | - Stefania Bulotta
- Department of Health Sciences, University "Magna Graecia" of Catanzaro, Campus "S. Venuta", 88100, Catanzaro, Italy
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Bignoux MJ, Otgaar TC, Bernert M, Weiss SFT, Ferreira E. Downregulation of LRP/LR with siRNA inhibits several cancer hallmarks in lung cancer cells. FEBS Open Bio 2023; 13:323-340. [PMID: 36579897 PMCID: PMC9900088 DOI: 10.1002/2211-5463.13544] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2022] [Revised: 12/07/2022] [Accepted: 12/28/2022] [Indexed: 12/30/2022] Open
Abstract
The incidence and mortality rates of cancer are growing rapidly worldwide, with lung cancer being the most commonly occurring cancer in males. Human carcinomas circumvent the inhibitory pathways induced by DNA damage and senescence through the upregulation of telomerase activity. The 37 kDa/67 kDa laminin receptor (LRP/LR) is a cell surface receptor which plays a role in several cancer hallmarks, including metastasis, angiogenesis, cell viability maintenance, apoptotic evasion, and mediating telomerase activity. We have previously shown that the knockdown of LRP/LR with an LRP-specific siRNA significantly impedes adhesion and invasion, induces apoptosis, and inhibits telomerase activity in various cancer cell lines in vitro. Here, we investigated the effect of downregulating LRP/LR with LRP-specific siRNA in A549 lung cancer cells. Downregulation of LRP/LR resulted in a significant decrease in cell viability, migration potential, and telomerase activity, as well as a significant increase in apoptosis. Proteomic analysis further suggested the re-establishment of immune control over the lung cancer cells, a previously unidentified facet of LRP downregulation in cancer. Altogether, we suggest that targeting LRP/LR for downregulation may have therapeutic potential for inhibiting several cancer hallmarks.
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Affiliation(s)
- Monique J. Bignoux
- School of Molecular and Cell BiologyUniversity of the WitwatersrandJohannesburgSouth Africa
| | - Tyrone C. Otgaar
- School of Molecular and Cell BiologyUniversity of the WitwatersrandJohannesburgSouth Africa
| | - Martin Bernert
- School of Molecular and Cell BiologyUniversity of the WitwatersrandJohannesburgSouth Africa
| | - Stefan F. T. Weiss
- School of Molecular and Cell BiologyUniversity of the WitwatersrandJohannesburgSouth Africa
| | - Eloise Ferreira
- School of Molecular and Cell BiologyUniversity of the WitwatersrandJohannesburgSouth Africa
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Groenendyk J, Stoletov K, Paskevicius T, Li W, Dai N, Pujol M, Busaan E, Ng HH, Boukouris AE, Saleme B, Haromy A, Cui K, Hu M, Yan Y, Zhang R, Michelakis E, Chen XZ, Lewis JD, Tang J, Agellon LB, Michalak M. Loss of the fructose transporter SLC2A5 inhibits cancer cell migration. Front Cell Dev Biol 2022; 10:896297. [PMID: 36268513 PMCID: PMC9578049 DOI: 10.3389/fcell.2022.896297] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2022] [Accepted: 09/09/2022] [Indexed: 11/13/2022] Open
Abstract
Metastasis is the primary cause of cancer patient death and the elevation of SLC2A5 gene expression is often observed in metastatic cancer cells. Here we evaluated the importance of SLC2A5 in cancer cell motility by silencing its gene. We discovered that CRISPR/Cas9-mediated inactivation of the SLC2A5 gene inhibited cancer cell proliferation and migration in vitro as well as metastases in vivo in several animal models. Moreover, SLC2A5-attenuated cancer cells exhibited dramatic alterations in mitochondrial architecture and localization, uncovering the importance of SLC2A5 in directing mitochondrial function for cancer cell motility and migration. The direct association of increased abundance of SLC2A5 in cancer cells with metastatic risk in several types of cancers identifies SLC2A5 as an important therapeutic target to reduce or prevent cancer metastasis.
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Affiliation(s)
- Jody Groenendyk
- Department of Biochemistry, University of Alberta, Edmonton, AB, Canada
| | | | | | - Wenjuan Li
- Department of Biochemistry, University of Alberta, Edmonton, AB, Canada
| | - Ning Dai
- Department of Biochemistry, University of Alberta, Edmonton, AB, Canada
| | - Myriam Pujol
- Department of Biochemistry, University of Alberta, Edmonton, AB, Canada
| | - Erin Busaan
- Department of Biochemistry, University of Alberta, Edmonton, AB, Canada
| | - Hoi Hei Ng
- Department of Biochemistry, University of Alberta, Edmonton, AB, Canada
| | | | - Bruno Saleme
- Department of Medicine, University of Alberta, Edmonton, AB, Canada
| | - Alois Haromy
- Department of Medicine, University of Alberta, Edmonton, AB, Canada
| | - Kaisa Cui
- Wuxi Cancer Institute, Affiliated Hospital of Jiangnan University, Wuxi, Jiangsu, China
| | - Miao Hu
- National “111” Center for Cellular Regulation and Molecular Pharmaceutics, Hubei University of Technology, Wuhan, China
| | - Yanan Yan
- National “111” Center for Cellular Regulation and Molecular Pharmaceutics, Hubei University of Technology, Wuhan, China
| | - Rui Zhang
- National “111” Center for Cellular Regulation and Molecular Pharmaceutics, Hubei University of Technology, Wuhan, China
| | | | - Xing-Zhen Chen
- Department of Physiology, University of Alberta, Edmonton, AB, Canada
| | - John D. Lewis
- Department of Oncology, University of Alberta, Edmonton, AB, Canada
| | - Jingfeng Tang
- National “111” Center for Cellular Regulation and Molecular Pharmaceutics, Hubei University of Technology, Wuhan, China
| | - Luis B. Agellon
- School of Human Nutrition, McGill University, Montreal, QC, Canada
- *Correspondence: Luis B. Agellon, ; Marek Michalak,
| | - Marek Michalak
- Department of Biochemistry, University of Alberta, Edmonton, AB, Canada
- *Correspondence: Luis B. Agellon, ; Marek Michalak,
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Lee DH, Paik ES, Cho YJ, Lee YY, Lee B, Lee EJ, Choi JJ, Choi CH, Lee S, Choi JW, Lee JW. Changes in subcellular localization of Lysyl-tRNA synthetase and the 67-kDa laminin receptor in epithelial ovarian cancer metastases. Cancer Biomark 2022; 35:99-109. [DOI: 10.3233/cbm-210077] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
BACKGROUND: Although lysyl-tRNA synthetase (KARS1) is predominantly located in the cytosol, it is also present in the plasma membrane where it stabilizes the 67-kDa laminin receptor (67LR). This physical interaction is strongly increased under metastatic conditions. However, the dynamic interaction of these two proteins and the turnover of KARS1 in the plasma membrane has not previously been investigated. OBJECTIVE: Our objective in this study was to identify the membranous location of KARS1 and 67LR and investigate if this changes with the developmental stage of epithelial ovarian cancer (EOC) and treatment with the inhibitor BC-K01. In addition, we evaluated the therapeutic efficacy of BC-K01 in combination with paclitaxel, as the latter is frequently used to treat patients with EOC. METHODS: Overall survival and prognostic significance were determined in EOC patients according to KARS1 and 67LR expression levels as determined by immunohistochemistry. Changes in the location and expression of KARS1 and 67LR were investigated in vitro after BC-K01 treatment. The effects of this compound on tumor growth and apoptosis were evaluated both in vitro and in vivo. RESULTS: EOC patients with high KARS1 and high 67LR expression had lower progression-free survival rates than those with low expression levels of these two markers. BC-K01 reduced cell viability and increased apoptosis in combination with paclitaxel in EOC cell xenograft mouse models. BC-K01 decreased membranous KARS1 expression, causing a reduction in 67LR membrane expression in EOC cell lines. BC-K01 significantly decreased in vivo tumor weight and number of nodules, especially when used in combination with paclitaxel. CONCLUSIONS: Co-localization of KARS1 and 67LR in the plasma membrane contributes to EOC progression. Inhibition of the KARS1-67LR interaction by BC-K01 suppresses metastasis in EOC.
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Affiliation(s)
- Dae Hoon Lee
- Department of Pharmacology, College of Pharmacy, Kyung Hee University, Seoul, Korea
- Department of Biomedical and Pharmaceutical Sciences, Kyung Hee University, Seoul, Korea
- Department of Pharmacology, College of Pharmacy, Kyung Hee University, Seoul, Korea
| | - E. Sun Paik
- Department of Obstetrics and Gynecology, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul, Korea
- Department of Pharmacology, College of Pharmacy, Kyung Hee University, Seoul, Korea
| | - Young-Jae Cho
- Department of Obstetrics and Gynecology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
- Department of Pharmacology, College of Pharmacy, Kyung Hee University, Seoul, Korea
| | - Yoo-Young Lee
- Department of Obstetrics and Gynecology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - Bada Lee
- Department of Pharmacology, College of Pharmacy, Kyung Hee University, Seoul, Korea
- Department of Biomedical and Pharmaceutical Sciences, Kyung Hee University, Seoul, Korea
| | - Eui Jin Lee
- Department of Pharmacology, College of Pharmacy, Kyung Hee University, Seoul, Korea
- Department of Biomedical and Pharmaceutical Sciences, Kyung Hee University, Seoul, Korea
| | - Jung-Joo Choi
- Department of Obstetrics and Gynecology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - Chel-Hun Choi
- Department of Obstetrics and Gynecology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - Sangmin Lee
- Department of Pharmacology, College of Pharmacy, Kyung Hee University, Seoul, Korea
| | - Jin Woo Choi
- Department of Pharmacology, College of Pharmacy, Kyung Hee University, Seoul, Korea
- Department of Biomedical and Pharmaceutical Sciences, Kyung Hee University, Seoul, Korea
- Department of Regulatory Science, College of Pharmacy, Kyung Hee University, Seoul, Korea
| | - Jeong-Won Lee
- Department of Obstetrics and Gynecology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
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Molecular modification, structural characterization, and biological activity of xylans. Carbohydr Polym 2021; 269:118248. [PMID: 34294285 DOI: 10.1016/j.carbpol.2021.118248] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2020] [Revised: 05/21/2021] [Accepted: 05/23/2021] [Indexed: 12/17/2022]
Abstract
The differences in the source and structure of xylans make them have various biological activities. However, due to their inherent structural limitations, the various biological activities of xylans are far lower than those of commercial drugs. Currently, several types of molecular modification methods have been developed to address these limitations, and many derivatives with specific biological activity have been obtained. Further research on structural characteristics, structure-activity relationship and mechanism of action is of great significance for the development of xylan derivatives. Therefore, the major molecular modification methods of xylans are introduced in this paper, and the primary structure and conformation characteristics of xylans and their derivatives are summarized. In addition, the biological activity and structure-activity relationship of the modified xylans are also discussed.
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Cuttler K, Bignoux MJ, Otgaar TC, Chigumba S, Ferreira E, Weiss SFT. LRP::FLAG Reduces Phosphorylated Tau Levels in Alzheimer's Disease Cell Culture Models. J Alzheimers Dis 2021; 76:753-768. [PMID: 32568204 DOI: 10.3233/jad-200244] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
BACKGROUND Alzheimer's disease (AD) is characterized by amyloid-β (Aβ) plaque and neurofibrillary tangle formation, respectively. Neurofibrillary tangles form as a result of the intracellular accumulation of hyperphosphorylated tau. Telomerase activity and levels of the human reverse transcriptase (hTERT) subunit of telomerase are significantly decreased in AD. Recently, it has been demonstrated that the 37 kDa/67 kDa laminin receptor (LRP/LR) interacts with telomerase and is implicated in Aβ pathology. Since both LRP/LR and telomerase are known to play a role in the Aβ facet of AD, we hypothesized that they might also play a role in tauopathy. OBJECTIVE This study aimed to determine if LRP/LR has a relationship with tau and whether overexpression of LRP::FLAG has an effect on tauopathy-related proteins. METHODS We employed confocal microscopy and FRET to determine whether LRP/LR and tau co-localize and interact. LRP::FLAG overexpression in HEK-293 and SH-SY5Y cells as well as analysis of tauopathy-related proteins was assessed by western blotting. RESULTS We demonstrate that LRP/LR co-localizes with tau in the perinuclear cell compartment and confirmed a direct interaction between LRP/LR and tau in HEK-293 cells. Overexpression of LRP::FLAG in HEK-293 and SH-SY5Y cells decreased total and phosphorylated tau levels with a concomitant decrease in PrPc levels, a tauopathy-related protein. LRP::FLAG overexpression also resulted in increased hTERT levels. CONCLUSION This data suggest that LRP/LR extends its role in AD through a direct interaction with tau, and recommend LRP::FLAG as a possible alternative AD therapeutic via decreasing phosphorylated tau levels.
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Affiliation(s)
- Katelyn Cuttler
- School of Molecular and Cell Biology, University of the Witwatersrand, Johannesburg, Republic of South Africa.,Present Address: Division of Molecular Biology and Human Genetics, Faculty of Medicine and Health Sciences, Stellenbosch University, Cape Town, Republic of South Africa
| | - Monique J Bignoux
- School of Molecular and Cell Biology, University of the Witwatersrand, Johannesburg, Republic of South Africa
| | - Tyrone C Otgaar
- School of Molecular and Cell Biology, University of the Witwatersrand, Johannesburg, Republic of South Africa
| | - Stephanie Chigumba
- School of Molecular and Cell Biology, University of the Witwatersrand, Johannesburg, Republic of South Africa
| | - Eloise Ferreira
- School of Molecular and Cell Biology, University of the Witwatersrand, Johannesburg, Republic of South Africa
| | - Stefan F T Weiss
- School of Molecular and Cell Biology, University of the Witwatersrand, Johannesburg, Republic of South Africa
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Laroui N, Cubedo N, Rossel M, Bettache N. Improvement of Cell Penetrating Peptide for Efficient siRNA Targeting of Tumor Xenografts in Zebrafish Embryos. ADVANCED THERAPEUTICS 2020. [DOI: 10.1002/adtp.201900204] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Nabila Laroui
- Institut des Biomolécules Max MousseronUMR 5247University of MontpellierCNRSENSCM 15, avenue Charles Flahault, BP14491 F‐34093 Montpellier cedex 5 France
| | - Nicolas Cubedo
- INSERMU1198University of Montpellier F‐34095, Montpellier France
- EPHE 4 rue Ferrus Paris F‐75014 France
| | - Mireille Rossel
- INSERMU1198University of Montpellier F‐34095, Montpellier France
- EPHE 4 rue Ferrus Paris F‐75014 France
| | - Nadir Bettache
- Institut des Biomolécules Max MousseronUMR 5247University of MontpellierCNRSENSCM 15, avenue Charles Flahault, BP14491 F‐34093 Montpellier cedex 5 France
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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] [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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Bignoux MJ, Cuttler K, Otgaar TC, Ferreira E, Letsolo BT, Weiss SF. LRP::FLAG Rescues Cells from Amyloid-β-Mediated Cytotoxicity Through Increased TERT Levels and Telomerase Activity. J Alzheimers Dis 2019; 69:729-741. [DOI: 10.3233/jad-190075] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- Monique J. Bignoux
- School of Molecular and Cell Biology, University of the Witwatersrand, Private Bag 3, Wits 2050, Johannesburg, South Africa
| | - Katelyn Cuttler
- School of Molecular and Cell Biology, University of the Witwatersrand, Private Bag 3, Wits 2050, Johannesburg, South Africa
| | - Tyrone C. Otgaar
- School of Molecular and Cell Biology, University of the Witwatersrand, Private Bag 3, Wits 2050, Johannesburg, South Africa
| | - Eloise Ferreira
- School of Molecular and Cell Biology, University of the Witwatersrand, Private Bag 3, Wits 2050, Johannesburg, South Africa
| | - Boitelo T. Letsolo
- School of Molecular and Cell Biology, University of the Witwatersrand, Private Bag 3, Wits 2050, Johannesburg, South Africa
| | - Stefan F.T. Weiss
- School of Molecular and Cell Biology, University of the Witwatersrand, Private Bag 3, Wits 2050, Johannesburg, South Africa
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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] [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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12
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Tumour cell blebbing and extracellular vesicle shedding: key role of matrikines and ribosomal protein SA. Br J Cancer 2019; 120:453-465. [PMID: 30739912 PMCID: PMC6461924 DOI: 10.1038/s41416-019-0382-0] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2018] [Revised: 12/06/2018] [Accepted: 12/20/2018] [Indexed: 01/08/2023] Open
Abstract
BACKGROUND Carcinogenesis occurs in elastin-rich tissues and leads to local inflammation and elastolytic proteinase release. This contributes to bioactive matrix fragment (Matrikine) accumulation like elastin degradation products (EDP) stimulating tumour cell invasive and metastatic properties. We previously demonstrate that EDPs exert protumoural activities through Hsp90 secretion to stabilised extracellular proteinases. METHODS EDP influence on cancer cell blebbing and extracellular vesicle shedding were examined with a videomicroscope coupled with confocal Yokogawa spinning disk, by transmission electron microscopy, scanning electron microscopy and confocal microscopy. The ribosomal protein SA (RPSA) elastin receptor was identified after affinity chromatography by western blotting and cell immunolocalisation. mRNA expression was studied using real-time PCR. SiRNA were used to confirm the essential role of RPSA. RESULTS We demonstrate that extracellular matrix degradation products like EDPs induce tumour amoeboid phenotype with cell membrane blebbing and shedding of extracellular vesicle containing Hsp90 and proteinases in the extracellular space. EDPs influence intracellular calcium influx and cytoskeleton reorganisation. Among matrikines, VGVAPG and AGVPGLGVG peptides reproduced EDP effects through RPSA binding. CONCLUSIONS Our data suggests that matrikines induce cancer cell blebbing and extracellular vesicle release through RPSA binding, favouring dissemination, cell-to-cell communication and growth of cancer cells in metastatic sites.
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Chetty CJ, Ferreira E, Jovanovic K, Weiss SFT. Knockdown of LRP/LR induces apoptosis in pancreatic cancer and neuroblastoma cells through activation of caspases. Exp Cell Res 2017; 360:264-272. [PMID: 28899658 DOI: 10.1016/j.yexcr.2017.09.016] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2017] [Revised: 09/07/2017] [Accepted: 09/08/2017] [Indexed: 12/21/2022]
Abstract
The 37kDa/67kDa laminin receptor (LRP/LR) serves various physiological and pathological roles such as enhancing tumour-related processes including metastasis, angiogenesis, cellular viability and telomerase activation in cancerous cell lines. The present study investigates the effect of siRNA mediated downregulation of LRP/LR on pancreatic cancer (AsPC-1) and neuroblastoma (IMR-32) cells. MTT and BrdU assays revealed that siRNA mediated downregulation of LRP resulted in a significant reduction in cell viability and cell proliferation. In addition, knock-down of LRP resulted in phosphatidylserine externalization, diminished nuclear integrity and significantly enhanced caspase-3 activity, which is indicative of apoptosis. LRP downregulation resulted in a significant increase in caspase-8 activity in IMR-32 cells and enhanced caspase-8 and 9 activity in AsPC-1 cells. These data recommend siRNA mediated knock-down of LRP as a potential therapeutic avenue for the treatment of pancreatic cancer and neuroblastoma.
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Affiliation(s)
- Carryn J Chetty
- School of Molecular and Cell Biology, University of the Witwatersrand, Private Bag 3, Wits 2050, Johannesburg, Republic of South Africa
| | - Eloise Ferreira
- School of Molecular and Cell Biology, University of the Witwatersrand, Private Bag 3, Wits 2050, Johannesburg, Republic of South Africa
| | - Katarina Jovanovic
- School of Molecular and Cell Biology, University of the Witwatersrand, Private Bag 3, Wits 2050, Johannesburg, Republic of South Africa
| | - Stefan F T Weiss
- School of Molecular and Cell Biology, University of the Witwatersrand, Private Bag 3, Wits 2050, Johannesburg, Republic of South Africa.
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14
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Munien C, Rebelo TM, Ferreira E, Weiss SF. IgG1-iS18 impedes the adhesive and invasive potential of early and late stage malignant melanoma cells. Exp Cell Res 2017; 351:135-141. [DOI: 10.1016/j.yexcr.2017.01.009] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2016] [Revised: 01/19/2017] [Accepted: 01/21/2017] [Indexed: 01/24/2023]
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15
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Pinnock EC, Jovanovic K, Pinto MG, Ferreira E, Dias BDC, Penny C, Knackmuss S, Reusch U, Little M, Schatzl HM, Weiss SFT. LRP/LR Antibody Mediated Rescuing of Amyloid-β-Induced Cytotoxicity is Dependent on PrPc in Alzheimer's Disease. J Alzheimers Dis 2016; 49:645-57. [PMID: 26484914 DOI: 10.3233/jad-150482] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
The neuronal perturbations in Alzheimer's disease are attributed to the formation of extracellular amyloid-β (Aβ) neuritic plaques, composed predominantly of the neurotoxic Aβ42 isoform. Although the plaques have demonstrated a role in synaptic dysfunction, neuronal cytotoxicity has been attributed to soluble Aβ42 oligomers. The 37kDa/67kDa laminin receptor has been implicated in Aβ42 shedding and Aβ42-induced neuronal cytotoxicity, as well as internalization of this neurotoxic peptide. As the cellular prion protein binds to both LRP/LR and Aβ42, the mechanism underlying this cytotoxicity may be indirectly due to the PrPc-Aβ42 interaction with LRP/LR. The effects of this interaction were investigated by 3-[4,5-dimethylthiazol-2-yl]-2,5 diphenyl tetrazolium bromide assays. PrPc overexpression significantly enhanced Aβ42 cytotoxicity in vitro, while PrP-/- cells were more resistant to the cytotoxic effects of Aβ42 and exhibited significantly less cell death than PrPc expressing N2a cells. Although anti-LRP/LR specific antibody IgG1-iS18 significantly enhanced cell viability in both pSFV1-huPrP1-253 transfected and non-transfected cells treated with exogenous Aβ42, it failed to have any cell rescuing effect in PrP-/- HpL3-4 cells. These results suggest that LRP/LR plays a significant role in Aβ42-PrPc mediated cytotoxicity and that anti-LRP/LR specific antibodies may serve as potential therapeutic tools for Alzheimer's disease.
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Affiliation(s)
- Emma C Pinnock
- School of Molecular and Cell Biology, University of the Witwatersrand, Wits, Johannesburg, Republic of South Africa (RSA)
| | - Katarina Jovanovic
- School of Molecular and Cell Biology, University of the Witwatersrand, Wits, Johannesburg, Republic of South Africa (RSA)
| | - Maxine G Pinto
- School of Molecular and Cell Biology, University of the Witwatersrand, Wits, Johannesburg, Republic of South Africa (RSA)
| | - Eloise Ferreira
- School of Molecular and Cell Biology, University of the Witwatersrand, Wits, Johannesburg, Republic of South Africa (RSA)
| | - Bianca Da Costa Dias
- School of Molecular and Cell Biology, University of the Witwatersrand, Wits, Johannesburg, Republic of South Africa (RSA)
| | - Clement Penny
- Department of Internal Medicine, University of the Witwatersrand, Johannesburg, Parktown, Republic of South Africa (RSA)
| | | | - Uwe Reusch
- Affimed GmbH, Technologiepark, Heidelberg, Germany
| | | | - Hermann M Schatzl
- Department of Comparative Biology & Experimental Medicine, University of Calgary, Calgary, AB, Canada
| | - Stefan F T Weiss
- School of Molecular and Cell Biology, University of the Witwatersrand, Wits, Johannesburg, Republic of South Africa (RSA)
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16
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Vania L, Chetty CJ, Ferreira E, Weiss SFT. Anti-LRP/LR specific antibody IgG1-iS18 significantly impedes adhesion and invasion in early and late stage colorectal carcinoma cells. Mol Med 2016; 22:664-673. [PMID: 27611822 DOI: 10.2119/molmed.2016.00169] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2016] [Accepted: 09/06/2016] [Indexed: 12/30/2022] Open
Abstract
Cancer is a highly complex disease that has become one of the leading causes of death globally. Metastasis, a major cause of cancer deaths, requires two crucial events known as adhesion and invasion. The 37kDa/67kDa laminin receptor [laminin receptor precursor/high-affinity laminin receptor (LRP/LR)] enhances these two steps, consequently aiding in cancer progression. In this study, the role of LRP/LR in adhesion and invasion of early (SW-480 & HT-29) and late (DLD-1) stage colorectal cancer cells has been investigated. Western blotting revealed that early and late stage colorectal cancer cells contained significantly higher total LRP/LR levels compared to poorly invasive MCF-7 breast cancer control cells. Flow cytometry revealed that all three stages of colorectal cancer displayed significantly higher cell surface LRP/LR levels. Furthermore, upon treatment of the colorectal cancer cells with the anti-LRP/LR specific antibody IgG1-iS18, adhesion to laminin-1 was significantly reduced in all three stages. Each stage's invasive potential was determined using the Matrigel™ invasion assay, which revealed that invasion is significantly impeded in all three colorectal cancer stages when the cells are incubated with IgG1-iS18. In addition, Pearson's correlation coefficients propose that both total and cell surface LRP/LR levels are directly proportional to the adhesive and invasive potential of all three stages of colorectal cancer. Hence, these findings indicate the potential for the use of the IgG1-iS18 antibody as a promising therapeutic tool for colorectal cancer patients of early and late stage.
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Affiliation(s)
- Leila Vania
- School of Molecular and Cell Biology, University of the Witwatersrand, Private Bag 3, Wits 2050, Johannesburg, The Republic of South Africa (RSA)
| | - Carryn J Chetty
- School of Molecular and Cell Biology, University of the Witwatersrand, Private Bag 3, Wits 2050, Johannesburg, The Republic of South Africa (RSA)
| | - Eloise Ferreira
- School of Molecular and Cell Biology, University of the Witwatersrand, Private Bag 3, Wits 2050, Johannesburg, The Republic of South Africa (RSA)
| | - Stefan F T Weiss
- School of Molecular and Cell Biology, University of the Witwatersrand, Private Bag 3, Wits 2050, Johannesburg, The Republic of South Africa (RSA)
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17
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Discovery of new small molecules inhibiting 67 kDa laminin receptor interaction with laminin and cancer cell invasion. Oncotarget 2016; 6:18116-33. [PMID: 26062445 PMCID: PMC4627239 DOI: 10.18632/oncotarget.4016] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [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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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 PMCID: PMC4829897 DOI: 10.1038/srep24457] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [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] [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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20
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Knock-Down of the 37kDa/67kDa Laminin Receptor LRP/LR Impedes Telomerase Activity. PLoS One 2015; 10:e0141618. [PMID: 26545108 PMCID: PMC4636255 DOI: 10.1371/journal.pone.0141618] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2015] [Accepted: 10/09/2015] [Indexed: 01/01/2023] Open
Abstract
Cancer has become a major problem worldwide due to its increasing incidence and mortality rates. Both the 37kDa/67kDa laminin receptor (LRP/LR) and telomerase are overexpressed in cancer cells. LRP/LR enhances the invasiveness of cancer cells thereby promoting metastasis, supporting angiogenesis and hampering apoptosis. An essential component of telomerase, hTERT is overexpressed in 85-90% of most cancers. hTERT expression and increased telomerase activity are associated with tumor progression. As LRP/LR and hTERT both play a role in cancer progression, we investigated a possible correlation between LRP/LR and telomerase. LRP/LR and hTERT co-localized in the perinuclear compartment of tumorigenic breast cancer (MDA_MB231) cells and non-tumorigenic human embryonic kidney (HEK293) cells. FLAG® Co-immunoprecipitation assays confirmed an interaction between LRP/LR and hTERT. In addition, flow cytometry revealed that both cell lines displayed high cell surface and intracellular LRP/LR and hTERT levels. Knock-down of LRP/LR by RNAi technology significantly reduced telomerase activity. These results suggest for the first time a novel function of LRP/LR in contributing to telomerase activity. siRNAs targeting LRP/LR may act as a potential alternative therapeutic tool for cancer treatment by (i) blocking metastasis (ii) promoting angiogenesis (iii) inducing apoptosis and (iv) impeding telomerase activity.
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21
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Khumalo T, Ferreira E, Jovanovic K, Veale RB, Weiss SFT. Knockdown of LRP/LR Induces Apoptosis in Breast and Oesophageal Cancer Cells. PLoS One 2015; 10:e0139584. [PMID: 26427016 PMCID: PMC4591328 DOI: 10.1371/journal.pone.0139584] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2014] [Accepted: 09/15/2015] [Indexed: 12/18/2022] Open
Abstract
Cancer is a global burden due to high incidence and mortality rates and is ranked the second most diagnosed disease amongst non-communicable diseases in South Africa. A high expression level of the 37kDa/67kDa laminin receptor (LRP/LR) is one characteristic of cancer cells. This receptor is implicated in the pathogenesis of cancer cells by supporting tumor angiogenesis, metastasis and especially for this study, the evasion of apoptosis. In the current study, the role of LRP/LR on cellular viability of breast MCF-7, MDA-MB 231 and WHCO1 oesophageal cancer cells was investigated. Western blot analysis revealed that total LRP expression levels of MCF-7, MDA-MB 231 and WHCO1 were significantly downregulated by targeting LRP mRNA using siRNA-LAMR1. This knockdown of LRP/LR resulted in a significant decrease of viability in the breast and oesophageal cancer cells as determined by an MTT assay. Transfection of MDA-MB 231 cells with esiRNA-RPSA directed against a different region of the LRP mRNA had similar effects on LRP/LR expression and cell viability compared to siRNA-LAMR1, excluding an off-target effect of siRNA-LAMR1. This reduction in cellular viability is as a consequence of apoptosis induction as indicated by the exposure of the phosphatidylserine protein on the surface of breast MCF-7, MDA-MB 231 and oesophageal WHCO1 cancer cells, respectively, detected by an Annexin-V/FITC assay as well as nuclear morphological changes observed post-staining with Hoechst. These observations indicate that LRP/LR is crucial for the maintenance of cellular viability of breast and oesophageal cancer cells and recommend siRNA technology targeting LRP expression as a possible novel alternative technique for breast and oesophageal cancer treatment.
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Affiliation(s)
- Thandokuhle Khumalo
- School of Molecular and Cell Biology, University of the Witwatersrand, Private Bag 3, Wits 2050, Johannesburg, The Republic of South Africa (RSA)
| | - Eloise Ferreira
- School of Molecular and Cell Biology, University of the Witwatersrand, Private Bag 3, Wits 2050, Johannesburg, The Republic of South Africa (RSA)
| | - Katarina Jovanovic
- School of Molecular and Cell Biology, University of the Witwatersrand, Private Bag 3, Wits 2050, Johannesburg, The Republic of South Africa (RSA)
| | - Rob B. Veale
- School of Molecular and Cell Biology, University of the Witwatersrand, Private Bag 3, Wits 2050, Johannesburg, The Republic of South Africa (RSA)
| | - Stefan F. T. Weiss
- School of Molecular and Cell Biology, University of the Witwatersrand, Private Bag 3, Wits 2050, Johannesburg, The Republic of South Africa (RSA)
- * E-mail:
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22
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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] [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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23
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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] [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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24
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Fujimura Y. Small molecule-sensing strategy and techniques for understanding the functionality of green tea. Biosci Biotechnol Biochem 2015; 79:687-99. [PMID: 25561325 DOI: 10.1080/09168451.2014.996205] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Various low-molecular-weight phytochemicals in green tea (Camellia sinensis L.), especially (-)-epigallocatechin-3-O-gallate (EGCG), are known to be involved in health promotion and disease risk reduction. However, the underlying mechanism has remained elusive because of the absence of an analytical technique that can easily detect the precise behavior of such a small molecule. Recently, we have identified a cell-surface EGCG-sensing receptor and the related signaling molecules that control the physiological functions of EGCG. We also developed a novel in situ label-free imaging technique for visualizing spatially resolved biotransformations based on simultaneous mapping of EGCG and its phase II metabolites. Furthermore, we established a chemometric method capable of evaluating the functionality of multicomponent green tea extracts by focusing on their compositional balances. This review highlights our proposed small molecule-sensing techniques for detecting the complex behavior of green tea components and linking such information to an enhanced understanding of green tea functionality.
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Affiliation(s)
- Yoshinori Fujimura
- a Innovation Center for Medical Redox Navigation , Kyushu University , Fukuoka , Japan
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25
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High resolution imaging study of interactions between the 37 kDa/67 kDa laminin receptor and APP, beta-secretase and gamma-secretase in Alzheimer's disease. PLoS One 2014; 9:e100373. [PMID: 24972054 PMCID: PMC4074076 DOI: 10.1371/journal.pone.0100373] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2013] [Accepted: 05/27/2014] [Indexed: 12/13/2022] Open
Abstract
Alzheimer's disease (AD) is the most prevalent form of dementia affecting the elderly. Neurodegeneration is caused by the amyloid beta (Aβ) peptide which is generated from the sequential proteolytic cleavage of the Amyloid Precursor Protein (APP) by the β– and γ- secretases. Previous reports revealed that the 37 kDa/67 kDa laminin receptor (LRP/LR) is involved in APP processing, however, the exact mechanism by which this occurs remains largely unclear. This study sought to assess whether LRP/LR interacted with APP, β- or γ-secretase. Detailed confocal microscopy revealed that LRP/LR showed a strong co-localisation with APP, β- and γ-secretase, respectively, at various sub-cellular locations. Superresolution Structured Illumination Microscopy (SR-SIM) showed that interactions were unlikely between LRP/LR and APP and β-secretase, respectively, while there was strong co-localisation between LRP/LR and γ-secretase at this 80 nm resolution. FRET was further employed to assess the possibility of protein-protein interactions and only an interaction between LRP/LR and γ-secretase was found. FLAG co-immunoprecipitation confirmed these findings as LRP/LR co-immunoprecipitated with γ-secretase, but failed to do so with APP. These findings indicate that LRP/LR exerts its influence on Aβ shedding via a direct interaction with the γ-secretase and possibly an indirect interaction with the β-secretase.
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26
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Anti-LRP/LR specific antibodies and shRNAs impede amyloid beta shedding in Alzheimer's disease. Sci Rep 2014; 3:2699. [PMID: 24048412 PMCID: PMC3776966 DOI: 10.1038/srep02699] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2013] [Accepted: 09/02/2013] [Indexed: 01/14/2023] Open
Abstract
Alzheimer's disease (AD) is the most prevalent form of dementia. The amyloid beta (Aβ) peptide is the predominant candidate aetiological agent and is generated through the sequential proteolytic cleavage of the Amyloid Precursor Protein (APP) by beta (β) and gamma (γ) secretases. Since the cellular prion protein (PrPc) has been shown to regulate Aβ shedding, we investigated whether the cellular receptor for PrPc, namely the 37 kDa/67 kDa Laminin Receptor (LRP/LR) played a role in Aβ shedding. Here we show that LRP/LR co-localises with the AD relevant proteins APP, β- and γ-secretase, respectively. Antibody blockage and shRNA knock-down of LRP/LR reduces Aβ shedding, due to impediment of β-secretase activity, rather than alteration of APP, β- and γ-secretase levels. These findings indicate that LRP/LR contributes to Aβ shedding and recommend anti-LRP/LR specific antibodies and shRNAs as novel therapeutic tools for AD treatment.
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Da Costa Dias B, Jovanovic K, Gonsalves D, Moodley K, Reusch U, Knackmuss S, Penny C, Weinberg MS, Little M, Weiss SFT. Anti-LRP/LR specific antibody IgG1-iS18 and knock-down of LRP/LR by shRNAs rescue cells from Aβ42 induced cytotoxicity. Sci Rep 2014; 3:2702. [PMID: 24048171 PMCID: PMC3776967 DOI: 10.1038/srep02702] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2013] [Accepted: 09/03/2013] [Indexed: 12/17/2022] Open
Abstract
Alzheimer's disease (AD) is characterized by neurofibrillary tangles, senile plaques and neuronal loss. Amyloid beta (Aβ) is proposed to elicit neuronal loss through cell surface receptors. As Aβ shares common binding partners with the 37 kDa/67 kDa laminin receptor (LRP/LR), we investigated whether these proteins interact and the pathological significance of this association. An LRP/LR-Αβ42 interaction was assessed by immunofluorescence microscopy and pull down assays. The cell biological effects were investigated by 3-(4,5-Dimethylthaizol-2-yl)-2,5-diphenyltetrazolium bromide and Bromodeoxyuridine assays. LRP/LR and Αβ42 co-localised on the cell surface and formed immobilized complexes suggesting an interaction. Antibody blockade by IgG1-iS18 and shRNA mediated down regulation of LRP/LR significantly enhanced cell viability and proliferation in cells co-treated with Αβ42 when compared to cells incubated with Αβ42 only. Results suggest that LRP/LR is implicated in Αβ42 mediated cytotoxicity and that anti-LRP/LR specific antibodies and shRNAs may serve as potential therapeutic tools for AD.
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Affiliation(s)
- Bianca Da Costa Dias
- School of Molecular and Cell Biology, University of the Witwatersrand, Private Bag 3, Wits 2050, Johannesburg, Republic of South Africa
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Chetty C, Khumalo T, Da Costa Dias B, Reusch U, Knackmuss S, Little M, Weiss SFT. Anti-LRP/LR specific antibody IgG1-iS18 impedes adhesion and invasion of liver cancer cells. PLoS One 2014; 9:e96268. [PMID: 24798101 PMCID: PMC4010454 DOI: 10.1371/journal.pone.0096268] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2013] [Accepted: 04/04/2014] [Indexed: 12/03/2022] Open
Abstract
Two key events, namely adhesion and invasion, are pivotal to the occurrence of metastasis. Importantly, the 37 kDa/67 kDa laminin receptor (LRP/LR) has been implicated in enhancing these two events thus facilitating cancer progression. In the current study, the role of LRP/LR in the adhesion and invasion of liver cancer (HUH-7) and leukaemia (K562) cells was investigated. Flow cytometry revealed that the HUH-7 cells displayed significantly higher cell surface LRP/LR levels compared to the poorly-invasive breast cancer (MCF-7) control cells, whilst the K562 cells displayed significantly lower cell surface LRP/LR levels in comparison to the MCF-7 control cells. However, Western blotting and densitometric analysis revealed that all three tumorigenic cell lines did not differ significantly with regards to total LRP/LR levels. Furthermore, treatment of liver cancer cells with anti-LRP/LR specific antibody IgG1-iS18 (0.2 mg/ml) significantly reduced the adhesive potential of cells to laminin-1 and the invasive potential of cells through the ECM-like Matrigel, whilst leukaemia cells showed no significant differences in both instances. Additionally, Pearson's correlation coefficients suggested direct proportionality between cell surface LRP/LR levels and the adhesive and invasive potential of liver cancer and leukaemia cells. These findings suggest the potential use of anti-LRP/LR specific antibody IgG1-iS18 as an alternative therapeutic tool for metastatic liver cancer through impediment of the LRP/LR- laminin-1 interaction.
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Affiliation(s)
- Carryn Chetty
- School of Molecular and Cell Biology, University of the Witwatersrand, Johannesburg, Gauteng, The Republic of South Africa (RSA)
| | - Thandokuhle Khumalo
- School of Molecular and Cell Biology, University of the Witwatersrand, Johannesburg, Gauteng, The Republic of South Africa (RSA)
| | - Bianca Da Costa Dias
- School of Molecular and Cell Biology, University of the Witwatersrand, Johannesburg, Gauteng, The Republic of South Africa (RSA)
| | - Uwe Reusch
- Affimed Therapeutics AG, Technologiepark, Im Neuenheimer Feld, Heidelberg, Baden-Wuerttemberg, Germany
| | - Stefan Knackmuss
- Affimed Therapeutics AG, Technologiepark, Im Neuenheimer Feld, Heidelberg, Baden-Wuerttemberg, Germany
| | - Melvyn Little
- Affimed Therapeutics AG, Technologiepark, Im Neuenheimer Feld, Heidelberg, Baden-Wuerttemberg, Germany
| | - Stefan F. T. Weiss
- School of Molecular and Cell Biology, University of the Witwatersrand, Johannesburg, Gauteng, The Republic of South Africa (RSA)
- * E-mail:
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Kim DG, Lee JY, Kwon NH, Fang P, Zhang Q, Wang J, Young NL, Guo M, Cho HY, Mushtaq AU, Jeon YH, Choi JW, Han JM, Kang HW, Joo JE, Hur Y, Kang W, Yang H, Nam DH, Lee MS, Lee JW, Kim ES, Moon A, Kim K, Kim D, Kang EJ, Moon Y, Rhee KH, Han BW, Yang JS, Han G, Yang WS, Lee C, Wang MW, Kim S. Chemical inhibition of prometastatic lysyl-tRNA synthetase-laminin receptor interaction. Nat Chem Biol 2013; 10:29-34. [PMID: 24212136 DOI: 10.1038/nchembio.1381] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2013] [Accepted: 09/18/2013] [Indexed: 01/11/2023]
Abstract
Lysyl-tRNA synthetase (KRS), a protein synthesis enzyme in the cytosol, relocates to the plasma membrane after a laminin signal and stabilizes a 67-kDa laminin receptor (67LR) that is implicated in cancer metastasis; however, its potential as an antimetastatic therapeutic target has not been explored. We found that the small compound BC-K-YH16899, which binds KRS, impinged on the interaction of KRS with 67LR and suppressed metastasis in three different mouse models. The compound inhibited the KRS-67LR interaction in two ways. First, it directly blocked the association between KRS and 67LR. Second, it suppressed the dynamic movement of the N-terminal extension of KRS and reduced membrane localization of KRS. However, it did not affect the catalytic activity of KRS. Our results suggest that specific modulation of a cancer-related KRS-67LR interaction may offer a way to control metastasis while avoiding the toxicities associated with inhibition of the normal functions of KRS.
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Affiliation(s)
- Dae Gyu Kim
- 1] Medicinal Bioconvergence Research Center, Seoul National University, Seoul, Korea. [2] Research Institute of Pharmaceutical Sciences, College of Pharmacy, Seoul National University, Seoul, Korea. [3]
| | - Jin Young Lee
- 1] Medicinal Bioconvergence Research Center, Seoul National University, Seoul, Korea. [2] Research Institute of Pharmaceutical Sciences, College of Pharmacy, Seoul National University, Seoul, Korea. [3]
| | - Nam Hoon Kwon
- 1] Medicinal Bioconvergence Research Center, Seoul National University, Seoul, Korea. [2] Research Institute of Pharmaceutical Sciences, College of Pharmacy, Seoul National University, Seoul, Korea
| | - Pengfei Fang
- Department of Cancer Biology, The Scripps Research Institute, Scripps Florida, Jupiter, Florida, USA
| | - Qian Zhang
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida, USA
| | - Jing Wang
- Department of Cancer Biology, The Scripps Research Institute, Scripps Florida, Jupiter, Florida, USA
| | - Nicolas L Young
- Ion Cyclotron Resonance Program, National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida, USA
| | - Min Guo
- Department of Cancer Biology, The Scripps Research Institute, Scripps Florida, Jupiter, Florida, USA
| | - Hye Young Cho
- College of Pharmacy, Korea University, Sejong, Korea
| | | | - Young Ho Jeon
- College of Pharmacy, Korea University, Sejong, Korea
| | - Jin Woo Choi
- 1] Medicinal Bioconvergence Research Center, Seoul National University, Seoul, Korea. [2] Wellman Center for Photomedicine, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts, USA
| | - Jung Min Han
- 1] Medicinal Bioconvergence Research Center, Seoul National University, Seoul, Korea. [2] Research Institute of Pharmaceutical Sciences, College of Pharmacy, Seoul National University, Seoul, Korea
| | | | | | - Youn Hur
- Yuhan Research Institute, Yongin, Korea
| | - Wonyoung Kang
- Department of Neurosurgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - Heekyoung Yang
- Department of Neurosurgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - Do-Hyun Nam
- Department of Neurosurgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - Mi-Sook Lee
- Research Institute of Pharmaceutical Sciences, College of Pharmacy, Seoul National University, Seoul, Korea
| | - Jung Weon Lee
- Research Institute of Pharmaceutical Sciences, College of Pharmacy, Seoul National University, Seoul, Korea
| | - Eun-Sook Kim
- College of Pharmacy, Duksung Women's University, Seoul, Korea
| | - Aree Moon
- College of Pharmacy, Duksung Women's University, Seoul, Korea
| | - Kibom Kim
- 1] Medicinal Bioconvergence Research Center, Seoul National University, Seoul, Korea. [2] Research Institute of Pharmaceutical Sciences, College of Pharmacy, Seoul National University, Seoul, Korea
| | - Doyeun Kim
- 1] Medicinal Bioconvergence Research Center, Seoul National University, Seoul, Korea. [2] Research Institute of Pharmaceutical Sciences, College of Pharmacy, Seoul National University, Seoul, Korea
| | - Eun Joo Kang
- Medicinal Bioconvergence Research Center, Seoul National University, Seoul, Korea
| | - Youngji Moon
- Medicinal Bioconvergence Research Center, Seoul National University, Seoul, Korea
| | - Kyung Hee Rhee
- Research Institute of Pharmaceutical Sciences, College of Pharmacy, Seoul National University, Seoul, Korea
| | - Byung Woo Han
- Research Institute of Pharmaceutical Sciences, College of Pharmacy, Seoul National University, Seoul, Korea
| | - Jee Sun Yang
- Translational Research Center for Protein Function Control, Department of Biotechnology and WCU Department of Biomedical Sciences, Yonsei University, Seoul, Korea
| | - Gyoonhee Han
- Translational Research Center for Protein Function Control, Department of Biotechnology and WCU Department of Biomedical Sciences, Yonsei University, Seoul, Korea
| | - Won Suk Yang
- 1] Medicinal Bioconvergence Research Center, Seoul National University, Seoul, Korea. [2] Research Institute of Pharmaceutical Sciences, College of Pharmacy, Seoul National University, Seoul, Korea
| | - Cheolju Lee
- BRI, Korea Institute of Science and Technology, Seoul, Korea
| | - Ming-Wei Wang
- The National Center for Drug Screening, Zhangjiang High-Tech Park, Shanghai, China
| | - Sunghoon Kim
- 1] Medicinal Bioconvergence Research Center, Seoul National University, Seoul, Korea. [2] Research Institute of Pharmaceutical Sciences, College of Pharmacy, Seoul National University, Seoul, Korea. [3] World Class University Department of Molecular Medicine and Biopharmaceutical Sciences, Seoul National University, Seoul, Korea
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Khalfaoui T, Groulx JF, Sabra G, GuezGuez A, Basora N, Vermette P, Beaulieu JF. Laminin receptor 37/67LR regulates adhesion and proliferation of normal human intestinal epithelial cells. PLoS One 2013; 8:e74337. [PMID: 23991217 PMCID: PMC3750003 DOI: 10.1371/journal.pone.0074337] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2013] [Accepted: 07/31/2013] [Indexed: 12/21/2022] Open
Abstract
Interactions between the cell basal membrane domain and the basement membrane are involved in several cell functions including proliferation, migration and differentiation. Intestinal epithelial cells can interact with laminin, a major intestinal basement membrane glycoprotein, via several cell-surface laminin-binding proteins including integrin and non-integrin receptors. The 37/67kDa laminin receptor (37/67LR) is one of these but its role in normal epithelial cells is still unknown. The aim of this study was to characterise the expression pattern and determine the main function of 37/67LR in the normal human small intestinal epithelium. Immunolocalization studies revealed that 37/67LR was predominantly present in the undifferentiated/proliferative region of the human intestinal crypt in both the immature and adult intestine. Using a human intestinal epithelial crypt (HIEC) cell line as experimental model, we determined that 37/67LR was expressed in proliferative cells in both the cytoplasmic and membrane compartments. Small-interfering RNA-mediated reduction of 37/67LR expression led to HIEC cell-cycle reduction and loss of the ability to adhere to laminin-related peptides under conditions not altering ribosomal function. Taken together, these findings indicate that 37/67LR regulates proliferation and adhesion in normal intestinal epithelial cells independently of its known association with ribosomal function.
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Affiliation(s)
- Taoufik Khalfaoui
- Laboratory of Intestinal Physiopathology, Department of Anatomy and Cell Biology, Faculty of Medicine and Health Sciences, Université de Sherbrooke, Sherbrooke, Quebec, Canada
| | - Jean-François Groulx
- Laboratory of Intestinal Physiopathology, Department of Anatomy and Cell Biology, Faculty of Medicine and Health Sciences, Université de Sherbrooke, Sherbrooke, Quebec, Canada
| | - Georges Sabra
- Laboratory of Bioengineering and Biophysics, Department of Chemical and Biotechnological Engineering, Université de Sherbrooke, Sherbrooke, Quebec, Canada
| | - Amel GuezGuez
- Laboratory of Intestinal Physiopathology, Department of Anatomy and Cell Biology, Faculty of Medicine and Health Sciences, Université de Sherbrooke, Sherbrooke, Quebec, Canada
| | - Nuria Basora
- Laboratory of Intestinal Physiopathology, Department of Anatomy and Cell Biology, Faculty of Medicine and Health Sciences, Université de Sherbrooke, Sherbrooke, Quebec, Canada
| | - Patrick Vermette
- Laboratory of Bioengineering and Biophysics, Department of Chemical and Biotechnological Engineering, Université de Sherbrooke, Sherbrooke, Quebec, Canada
| | - Jean-François Beaulieu
- Laboratory of Intestinal Physiopathology, Department of Anatomy and Cell Biology, Faculty of Medicine and Health Sciences, Université de Sherbrooke, Sherbrooke, Quebec, Canada
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Adhesion and Invasion of Breast and Oesophageal Cancer Cells Are Impeded by Anti-LRP/LR-Specific Antibody IgG1-iS18. PLoS One 2013; 8:e66297. [PMID: 23823499 PMCID: PMC3688881 DOI: 10.1371/journal.pone.0066297] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2013] [Accepted: 05/03/2013] [Indexed: 12/31/2022] Open
Abstract
Adhesion and invasion have been identified as the two key components of metastasis. The 37 kDa/67 kDa laminin receptor (LRP/LR) is thought to enhance these two processes thus endorsing the progression of cancer. Here we report on LRP/LR and the metastatic potential of MDA-MB 231 breast and WHCO1 oesophageal cancer cells. Western blot analysis revealed a significant increase in total laminin receptor precursor (LRP) levels of breast and oesophageal cancer cells in comparison to non-invasive MCF-7 breast cancer cells, whereas LRP/LR cell surface levels in both cell lines were not significantly different to those of MCF-7 cells as analysed by flow cytometry. Incubation of breast and oesophageal cancer cells with the anti-LRP/LR specific antibody, IgG1-iS18, resulted in significant reduction in the adhesive potential of WHCO1 and MDA-MB 231 cells by 92% and 16%, respectively. Moreover, invasion was significantly impeded by 98% and 25% for WHCO1 and MDA-MB 231 cells, respectively. Pearson's correlation coefficients proved a positive correlation between total LRP/LR levels and invasive potential as well as between the adhesive and invasive potential of breast and oesophageal cancer cells. Our findings suggest that through interference of the LRP/LR-laminin-1 interaction, anti-LRP/LR specific antibody IgG1-iS18 may act as a possible alternative therapeutic tool for metastatic breast and oesophageal cancer treatment.
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32
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Khusal R, Da Costa Dias B, Moodley K, Penny C, Reusch U, Knackmuss S, Little M, Weiss SFT. In vitro inhibition of angiogenesis by antibodies directed against the 37kDa/67kDa laminin receptor. PLoS One 2013; 8:e58888. [PMID: 23554951 PMCID: PMC3595224 DOI: 10.1371/journal.pone.0058888] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2012] [Accepted: 02/07/2013] [Indexed: 11/24/2022] Open
Abstract
The 37kDa/67kDa laminin receptor (LRP/LR) is a central receptor mediating interactions between tumour cells and the basement membrane and is thereby a key player in adhesion and invasion, essential processes in metastatic cancer. To affect continued tumour growth, tumours induce angiogenesis for the constant delivery of nutrients and oxygen. This study aims to determine the blocking effect of the anti-LRP/LR specific antibody, W3 on the angiogenic potential of HUVE (human umbilical vein endothelial) cells. Flow cytometric analysis revealed that 97% of HUVE cells display cell surface LRP/LR. An angiogenesis assay was conducted employing HUVE cells seeded on the basement membrane reconstituent Matrigel™ supplemented with the pro-angiogenic factor vascular endothelial growth factor (VEGF). Post 18h incubation at 37°C tubular structures, namely tube lengths were assessed. Treatment of established tubular structures with 100 µg/ml anti-LRP/LR specific antibody completely blocked angiogenesis. Our findings suggest a central role of the 37kDa/67kDa LRP/LR in tube formation and recommends anti-LRP/LR specific antibodies as potential therapeutic tools for treatment of tumour angiogenesis.
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Affiliation(s)
- Raksha Khusal
- School of Molecular and Cell Biology, University of the Witwatersrand, Johannesburg, Republic of South Africa
| | - Bianca Da Costa Dias
- School of Molecular and Cell Biology, University of the Witwatersrand, Johannesburg, Republic of South Africa
| | - Kiashanee Moodley
- School of Molecular and Cell Biology, University of the Witwatersrand, Johannesburg, Republic of South Africa
| | - Clement Penny
- Department of Internal Medicine, University of the Witwatersrand, Johannesburg, Republic of South Africa
| | - Uwe Reusch
- Affimed Therapeutics AG, Technologiepark, Im Neuenheimer Feld 582, Heidelberg, Germany
| | - Stefan Knackmuss
- Affimed Therapeutics AG, Technologiepark, Im Neuenheimer Feld 582, Heidelberg, Germany
| | - Melvyn Little
- Affimed Therapeutics AG, Technologiepark, Im Neuenheimer Feld 582, Heidelberg, Germany
| | - Stefan F. T. Weiss
- School of Molecular and Cell Biology, University of the Witwatersrand, Johannesburg, Republic of South Africa
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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] [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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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] [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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Venticinque L, Meruelo D. Comprehensive proteomic analysis of nonintegrin laminin receptor interacting proteins. J Proteome Res 2012; 11:4863-72. [PMID: 22909348 PMCID: PMC3495180 DOI: 10.1021/pr300307h] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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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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: 62] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [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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37
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Omar A, Reusch U, Knackmuss S, Little M, Weiss SFT. Anti-LRP/LR-specific antibody IgG1-iS18 significantly reduces adhesion and invasion of metastatic lung, cervix, colon and prostate cancer cells. J Mol Biol 2012; 419:102-9. [PMID: 22391421 DOI: 10.1016/j.jmb.2012.02.035] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2011] [Revised: 02/23/2012] [Accepted: 02/24/2012] [Indexed: 11/30/2022]
Abstract
The 37-kDa/67-kDa laminin receptor [laminin receptor precursor/high-affinity laminin receptor (LRP/LR)] is thought to play a major role in invasion and adhesion, key components of metastatic cancer. Lung cancer, cervical cancer, colon cancer and prostate cancer are among the top 10 cancer types worldwide. Here, we report that LRP/LR levels on the surface of lung cancer cells, cervical cancer cells, colon cancer cells and prostate cancer cells are significantly increased compared to non-tumorigenic fibroblasts. Adhesion of lung cancer cells, cervical cancer cells, colon cancer cells and prostate cancer cells to laminin-1 is significantly reduced, employing the anti-LRP/LR-specific antibody IgG1-iS18. Invasion of these cell lines into the Matrigel™ matrix was significantly impeded with IgG1-iS18. The Pearson's correlation coefficient proves a correlation between LRP/LR cell-surface levels and invasion potential, as well as adhesion and invasion, respectively. Our findings suggest that IgG1-iS18 antibody might act as alternative therapeutic tool for treatment of various metastatic cancer types.
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Affiliation(s)
- Aadilah Omar
- School of Molecular and Cell Biology, University of the Witwatersrand, Private Bag 3, Wits 2050, Johannesburg, The Republic of South Africa
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Extraribosomal functions associated with the C terminus of the 37/67 kDa laminin receptor are required for maintaining cell viability. Cell Death Dis 2011; 1:e42. [PMID: 21243100 PMCID: PMC3019570 DOI: 10.1038/cddis.2010.19] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [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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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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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Structure-guided identification of a laminin binding site on the laminin receptor precursor. J Mol Biol 2010; 405:24-32. [PMID: 21040730 DOI: 10.1016/j.jmb.2010.10.028] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2010] [Revised: 10/15/2010] [Accepted: 10/17/2010] [Indexed: 12/19/2022]
Abstract
The 37/ 67-kDa human laminin receptor (LamR) is a cell surface receptor for laminin, prion protein, and a variety of viruses. Because of its wide range of ligands, LamR plays a role in numerous pathologies. LamR overexpression correlates with a highly invasive cell phenotype and increased metastatic ability, mediated by interactions between LamR and laminin. In addition, the specific targeting of LamR with small interfering RNAs, blocking antibodies, and Sindbis viral vectors confers anti-tumor effects. We adopted a structure-based approach to map a laminin binding site on human LamR by comparing the sequences and crystal structures of LamR and Archaeoglobus fulgidus S2p, a non-laminin-binding ortholog. Here, we identify a laminin binding site on LamR, comprising residues Phe32, Glu35, and Arg155, which are conserved among mammalian species. Mutation of these residues results in a significant loss of laminin binding. Further, recombinant wild-type LamR is able to act as a soluble decoy to inhibit cellular migration towards laminin. Mutation of this laminin binding site results in loss of migration inhibition, which demonstrates the physiological role of Phe32, Glu35, and Arg155 for laminin binding activity. Mapping of the LamR binding site should contribute to the development of therapeutics that inhibit LamR interactions with laminin and may aid in the prevention of tumor growth and metastasis.
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Liu L, Sun L, Zhao P, Yao L, Jin H, Liang S, Wang Y, Zhang D, Pang Y, Shi Y, Chai N, Zhang H, Zhang H. Hypoxia promotes metastasis in human gastric cancer by up-regulating the 67-kDa laminin receptor. Cancer Sci 2010; 101:1653-60. [PMID: 20491781 PMCID: PMC11158106 DOI: 10.1111/j.1349-7006.2010.01592.x] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Abstract
It has been reported that the 67-kDa laminin receptor (67LR) is implicated in cancer metastasis. We recently showed that 37LRP, the 67LR precursor, is a hypoxia-inducible factor 1 (HIF-1) target gene exposed to hypoxia in gastric cancer. Here, we investigated the role of 67LR in hypoxic metastasis and invasion in gastric cancer. Immunohistochemical analysis, western blotting, and RT-PCR assays revealed that 67LR was highly expressed in metastatic gastric cancers in vivo. Knockdown of the 67LR protein by RNA interference significantly decreased the adhesive, invasive, and in vivo metastatic abilities of the gastric cancer cell lines SGC7901 and MKN-45. Western blot analysis showed that 67LR increased the expression of urokinase-type plasminogen activator (uPA) and matrix metalloproteinase (MMP)-9, and decreased tissue inhibitor of matrix metalloproteinase (TIMP)-1 protein. We further showed that hypoxia induced 67LR expression in a time-dependent manner and this induction was inhibited by HIF-1 small-interfering (si) RNA. Both ERK and JNK inhibitors significantly inhibited hypoxia-induced expression of 67LR and the subsequent expression of uPA and MMP 9. SiRNA against 67LR or antibody against MMP9 and uPA significantly inhibited hypoxia-induced in vitro invasive ability. Taken together, these results reveal that 67LR promotes the invasive and metastatic ability of the gastric cancer cells through increasing uPA and MMP 9 expression, with involvement of the ERK and JNK signal pathway in hypoxia-induced 67 LR expressions and subsequent uPA and MMP9 expression.
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Affiliation(s)
- Lili Liu
- Department of Oncology, Tangdu Hospital, Xi'an, China
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Van den Broeke A, Van Poucke M, Marcos-Carcavilla A, Hugot K, Hayes H, Bertaud M, Van Zeveren A, Peelman LJ. Characterization of the ovine ribosomal protein SA gene and its pseudogenes. BMC Genomics 2010; 11:179. [PMID: 20233419 PMCID: PMC2850357 DOI: 10.1186/1471-2164-11-179] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2009] [Accepted: 03/16/2010] [Indexed: 12/15/2022] Open
Abstract
Background The ribosomal protein SA (RPSA), previously named 37-kDa laminin receptor precursor/67-kDa laminin receptor (LRP/LR) is a multifunctional protein that plays a role in a number of pathological processes, such as cancer and prion diseases. In all investigated species, RPSA is a member of a multicopy gene family consisting of one full length functional gene and several pseudogenes. Therefore, for studies on RPSA related pathways/pathologies, it is important to characterize the whole family and to address the possible function of the other RPSA family members. The present work aims at deciphering the RPSA family in sheep. Results In addition to the full length functional ovine RPSA gene, 11 other members of this multicopy gene family, all processed pseudogenes, were identified. Comparison between the RPSA transcript and these pseudogenes shows a large variety in sequence identities ranging from 99% to 74%. Only one of the 11 pseudogenes, i.e. RPSAP7, shares the same open reading frame (ORF) of 295 amino acids with the RPSA gene, differing in only one amino acid. All members of the RPSA family were annotated by comparative mapping and fluorescence in situ hybridization (FISH) localization. Transcription was investigated in the cerebrum, cerebellum, spleen, muscle, lymph node, duodenum and blood, and transcripts were detected for 6 of the 11 pseudogenes in some of these tissues. Conclusions In the present work we have characterized the ovine RPSA family. Our results have revealed the existence of 11 ovine RPSA pseudogenes and provide new data on their structure and sequence. Such information will facilitate molecular studies of the functional RPSA gene taking into account the existence of these pseudogenes in the design of experiments. It remains to be investigated if the transcribed members are functional as regulatory non-coding RNA or as functional proteins.
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Affiliation(s)
- Alice Van den Broeke
- Department of Nutrition, Genetics and Ethology, Faculty of Veterinary Medicine, Ghent University, Heidestraat 19, Merelbeke, Belgium
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Multiple functions of the 37/67-kd laminin receptor make it a suitable target for novel cancer gene therapy. Mol Ther 2009; 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] [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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Muras AG, Hajj GNM, Ribeiro KB, Nomizo R, Nonogaki S, Chammas R, Martins VR. Prion protein ablation increases cellular aggregation and embolization contributing to mechanisms of metastasis. Int J Cancer 2009; 125:1523-31. [PMID: 19444918 DOI: 10.1002/ijc.24425] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Cellular Prion Protein (PrP(C)) is a cell surface protein highly expressed in the nervous system, and to a lesser extent in other tissues. PrP(C) binds to the extracellular matrix laminin and vitronectin, to mediate cell adhesion and differentiation. Herein, we investigate how PrP(C) expression modulates the aggressiveness of transformed cells. Mesenchymal embryonic cells (MEC) from wild-type (Prnp(+/+)) and PrP(C)-null (Prnp(0/0)) mice were immortalized and transformed by co-expression of ras and myc. These cells presented similar growth rates and tumor formation in vivo. When injected in the tail vein, Prnp(0/0)ras/myc cells exhibited increased lung colonization compared with Prnp(+/+)ras/myc cells. Additionally, Prnp(0/0)ras/myc cells form more aggregates with blood components than Prnp(+/+)ras/myc cells, facilitating the arrest of Prnp(0/0)ras/myc cells in the lung vasculature. Integrin alpha(v)beta(3) is more expressed and activated in MEC and in transformed Prnp(0/0) cells than in the respective Prnp(+/+) cells. The blocking of integrin alpha(v)beta(3) by RGD peptide reduces lung colonization in transformed Prnp(0/0) cells to similar levels of those presented by transformed Prnp(+/+) cells. Our data indicate that PrP(C) negatively modulates the expression and activation of integrin alpha(v)beta(3) resulting in a more aggressive phenotype. These results indicate that PrP(C) may have main implications in modulating metastasis formation.
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Affiliation(s)
- Angelita G Muras
- Cellular and Molecular Biology Group, Ludwig Institute for Cancer Research, São Paulo, SP, Brazil
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Mehrpour M, Codogno P. Prion protein: From physiology to cancer biology. Cancer Lett 2009; 290:1-23. [PMID: 19674833 DOI: 10.1016/j.canlet.2009.07.009] [Citation(s) in RCA: 68] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2009] [Revised: 07/10/2009] [Accepted: 07/13/2009] [Indexed: 12/26/2022]
Abstract
Prion protein (PrPc) was originally viewed solely as being involved in prion disease, but now several intriguing lines of evidence have emerged indicating that it plays a fundamental role not only in the nervous system, but also throughout the human body. PrPc is expressed most abundantly in the brain, but has also been detected in other non-neuronal tissues as diverse as lymphoid cells, lung, heart, kidney, gastrointestinal tract, muscle, and mammary glands. Recent data indicate that PrPc may be implicated in biology of glioblastoma, breast cancer, prostate and gastric cancer. Over expression of PrPc is correlated to the acquisition by tumor cells of a phenotype for resistance to cell death induced by TNF alpha and TRAIL or antitumor drugs such as paclitaxel and anthracyclines. PrPc may promote tumorigenesis, proliferation and G1/S transition in gastric cancer cells. This review revisits the physiological functions of PrPc, and its possible implications for cancer biology.
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Chen F, Qian Y, Duan Y, Ren W, Yang Y, Zhang C, Qiu Y, Ji Y. Down-regulation of 67LR reduces the migratory activity of human glioma cells in vitro. Brain Res Bull 2009; 79:402-8. [DOI: 10.1016/j.brainresbull.2009.04.019] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2009] [Revised: 04/13/2009] [Accepted: 04/13/2009] [Indexed: 10/20/2022]
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Herbst A, Bommer GT, Kriegl L, Jung A, Behrens A, Csanadi E, Gerhard M, Bolz C, Riesenberg R, Zimmermann W, Dietmaier W, Wolf I, Brabletz T, Göke B, Kolligs FT. ITF-2 is disrupted via allelic loss of chromosome 18q21, and ITF-2B expression is lost at the adenoma-carcinoma transition. Gastroenterology 2009; 137:639-48, 648.e1-9. [PMID: 19394332 DOI: 10.1053/j.gastro.2009.04.049] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/11/2008] [Revised: 04/10/2009] [Accepted: 04/13/2009] [Indexed: 12/02/2022]
Abstract
BACKGROUND & AIMS The ubiquitously expressed basic helix-loop-helix transcription factor ITF-2B has an important role in differentiation processes, and its transcription is regulated by beta-catenin. The ITF-2 gene is located in the chromosomal region 18q21; allelic loss of this locus occurs in 70% of colorectal cancers. We analyzed the expression, regulation, and function of ITF-2B in colorectal carcinogenesis. METHODS The loss-of-heterozygosity (LOH) status of 18q21 and expression of ITF-2B were studied in colorectal carcinomas using polymerase chain reaction-based methods and immunohistochemistry. The biologic effects of ITF-2B were studied in colorectal cancer cells. Reporter gene assays and chromatin immunoprecipitation were utilized to analyze effects of ITF-2B on gene transcription. RESULTS ITF-2B is strongly expressed in colon adenomas but frequently down-regulated in carcinomas because of LOH at 18q21. ITF-2B induces cell cycle arrest and regulates the expression of p21(Cip1) via newly identified E-boxes in the CDKN1A gene, independently of p53. Loss of ITF-2B expression correlates with loss of p21(Cip1) expression in primary colon carcinomas. CONCLUSIONS Accumulation of mutations and allelic losses are driving forces of colorectal carcinogenesis. ITF-2B, which is up-regulated during early colorectal carcinogenesis because of loss of adenomatous polyposis coli, is a target for LOH on chromosome 18q, along with deleted in colorectal carcinoma and Smad4. This finding, along with the fact that ITF-2B is a regulator of the key cell cycle inhibitor p21(Cip1), indicates that ITF-2B is a tumor suppressor that has an important function at the adenoma to carcinoma transition.
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Affiliation(s)
- Andreas Herbst
- Department of Medicine II, University of Munich, Munich, Germany
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Pflanz H, Vana K, Mitteregger G, Renner-Müller I, Pace C, Küchenhoff H, Kretzschmar HA, Wolf E, Weiss S. Scrapie-infected transgenic mice expressing a laminin receptor decoy mutant reveal a prolonged incubation time associated with low levels of PrPres. J Mol Biol 2009; 388:721-9. [PMID: 19324055 DOI: 10.1016/j.jmb.2009.03.045] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2008] [Revised: 02/27/2009] [Accepted: 03/09/2009] [Indexed: 10/21/2022]
Abstract
The 37-kDa/67-kDa laminin receptor (LRP/LR) was identified as a cell surface receptor for prion proteins. The laminin receptor mutant LRP102-295::FLAG interfered with PrP(Sc) propagation in murine neuronal cells presumably acting as a decoy in a transdominant negative fashion by trapping PrP molecules in the extracellular matrix. Here, we generated hemizygous transgenic mice expressing LRP102-295::FLAG in the brain. Scrapie-infected transgenic mice exhibit a significantly prolonged incubation time in comparison to scrapie-infected wild-type (FVB) mice. At the terminal stage, transgenic mice revealed significantly reduced proteinase-K-resistant PrP levels by 71% compared to wild-type mice. Our results recommend the laminin receptor decoy mutant as an alternative therapeutic tool for treatment of transmissible spongiform encephalopathies.
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Affiliation(s)
- Heike Pflanz
- Laboratorium für Molekulare Biologie, Genzentrum, Institut für Biochemie der LMU München, München, Germany
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Pflanz H, Vana K, Mitteregger G, Pace C, Messow D, Sedlaczek C, Nikles D, Kretzschmar HA, Weiss SFT. Microinjection of lentiviral vectors expressing small interfering RNAs directed against laminin receptor precursor mRNA prolongs the pre-clinical phase in scrapie-infected mice. J Gen Virol 2009; 90:269-74. [PMID: 19088298 DOI: 10.1099/vir.0.004168-0] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
We examined therapeutic in vitro and in vivo approaches using lentivirus-based packaging of small interfering RNAs (siRNAs) targeting the non-integrin laminin receptor mRNA for treatment and prevention of prion disorders. Transfection of N2aSc(+) cells with recombinant plasmids expressing three different siRNAs, significantly reduced both the LRP (laminin receptor precursor) and PrP(Sc) levels by approximately 40-60 %. Stereotactic intracerebral microinjection of recombinant lentiviral vectors LVsiRNA-LRP 7 and 9 into the cortex of C57BL/6 wild-type mice resulted in a significant reduction of the LR levels in the cortex 15 days post-injection by 62 and 82 %, respectively. Intracerebral RML inoculation of C57BL/6 mice after microinjection with recombinant lentiviral vector LVsiRNA-LRP 7 into the hippocampus resulted in a significant reduction of both LRP and PrP(Sc) levels by 36 and 41 %, respectively, concomitant with a significant prolongation of the pre-clinical phase. Lentiviral vectors expressing siRNAs targeting LRP mRNA represent a novel delivery system for the treatment of transmissible spongiform encephalopathies.
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Affiliation(s)
- Heike Pflanz
- Laboratorium für Molekulare Biologie - Genzentrum - Institut für Biochemie der LMU München, Feodor-Lynen Str. 25, D-81377 München, Germany
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Zuber C, Mitteregger G, Schuhmann N, Rey C, Knackmuss S, Rupprecht W, Reusch U, Pace C, Little M, Kretzschmar HA, Hallek M, Büning H, Weiss S. Delivery of single-chain antibodies (scFvs) directed against the 37/67 kDa laminin receptor into mice via recombinant adeno-associated viral vectors for prion disease gene therapy. J Gen Virol 2008; 89:2055-2061. [PMID: 18632978 DOI: 10.1099/vir.0.83670-0] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The 37/67 kDa laminin receptor (LRP/LR) acts as a receptor for prions providing a promising target for the treatment of prion diseases. Recently, we selected anti-LRP/LR single-chain antibodies (scFvs) and proved a reduction of the peripheral PrP(Sc) propagation by passive immunotransfer into scrapie-infected mice. Here, we report the development of an in vivo gene delivery system based on adeno-associated virus (AAV) vectors expressing scFvs-S18 and -N3 directed against LRP/LR. Transduction of neuronal and non-neuronal cells with recombinant (r)AAV serotype 2 vectors encoding scFv-S18, -N3 and -C9 verified the efficient secretion of the antibodies. These vectors were administered via stereotactic intracerebral microinjection into the hippocampus of C57BL/6 mice, followed by intracerebral inoculation with 10 % RML at the same site 2 weeks post-injection of rAAV. After 90 days post-infection, scFv-S18 and -N3 expression resulted in the reduction of peripheral PrP(Sc) propagation by approximately 60 and 32 %, respectively, without a significant prolongation of incubation times and survival. Proof of rAAV vector DNA in spleen samples by real-time PCR strongly suggests a transport or trafficking of rAAV from the brain to the spleen, resulting in rAAV-mediated expression of scFv followed by reduced PrP(Sc) levels in the spleen most likely due to the blockage of the prion receptor LRP/LR by scFv.
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Affiliation(s)
- Chantal Zuber
- Laboratorium für Molekulare Biologie - Genzentrum - Institut für Biochemie der LMU München, Feodor-Lynen-Str. 25, D-81377 München, Germany
| | - Gerda Mitteregger
- Zentrum für Neuropathologie und Prionforschung der LMU München, Feodor-Lynen-Str. 23, 81377 München, Germany
| | - Natascha Schuhmann
- Universität zu Köln, Klinik I für Innere Medizin, Kerpener Str. 62, 50937 Köln, Germany
| | - Clémence Rey
- Laboratorium für Molekulare Biologie - Genzentrum - Institut für Biochemie der LMU München, Feodor-Lynen-Str. 25, D-81377 München, Germany
| | - Stefan Knackmuss
- Affimed Therapeutics AG, Technologiepark, Im Neuenheimer Feld 582, 69120 Heidelberg, Germany
| | - Wolfgang Rupprecht
- Laboratorium für Molekulare Biologie - Genzentrum - Institut für Biochemie der LMU München, Feodor-Lynen-Str. 25, D-81377 München, Germany
| | - Uwe Reusch
- Affimed Therapeutics AG, Technologiepark, Im Neuenheimer Feld 582, 69120 Heidelberg, Germany
| | - Claudia Pace
- Zentrum für Neuropathologie und Prionforschung der LMU München, Feodor-Lynen-Str. 23, 81377 München, Germany
| | - Melvyn Little
- Affimed Therapeutics AG, Technologiepark, Im Neuenheimer Feld 582, 69120 Heidelberg, Germany
| | - Hans A Kretzschmar
- Zentrum für Neuropathologie und Prionforschung der LMU München, Feodor-Lynen-Str. 23, 81377 München, Germany
| | - Michael Hallek
- Zentrum für Molekulare Medizin Köln, Universität zu Köln, Joseph-Stelzmann-Str. 52, 50931 Köln, Germany.,Universität zu Köln, Klinik I für Innere Medizin, Kerpener Str. 62, 50937 Köln, Germany
| | - Hildegard Büning
- Zentrum für Molekulare Medizin Köln, Universität zu Köln, Joseph-Stelzmann-Str. 52, 50931 Köln, Germany.,Universität zu Köln, Klinik I für Innere Medizin, Kerpener Str. 62, 50937 Köln, Germany
| | - Stefan Weiss
- Laboratorium für Molekulare Biologie - Genzentrum - Institut für Biochemie der LMU München, Feodor-Lynen-Str. 25, D-81377 München, Germany
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