1
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Ezzati S, Salib S, Balasubramaniam M, Aboud O. Epidermal Growth Factor Receptor Inhibitors in Glioblastoma: Current Status and Future Possibilities. Int J Mol Sci 2024; 25:2316. [PMID: 38396993 PMCID: PMC10889328 DOI: 10.3390/ijms25042316] [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: 01/21/2024] [Revised: 02/11/2024] [Accepted: 02/13/2024] [Indexed: 02/25/2024] Open
Abstract
Glioblastoma, a grade 4 glioma as per the World Health Organization, poses a challenge in adult primary brain tumor management despite advanced surgical techniques and multimodal therapies. This review delves into the potential of targeting epidermal growth factor receptor (EGFR) with small-molecule inhibitors and antibodies as a treatment strategy. EGFR, a mutationally active receptor tyrosine kinase in over 50% of glioblastoma cases, features variants like EGFRvIII, EGFRvII and missense mutations, necessitating a deep understanding of their structures and signaling pathways. Although EGFR inhibitors have demonstrated efficacy in other cancers, their application in glioblastoma is hindered by blood-brain barrier penetration and intrinsic resistance. The evolving realm of nanodrugs and convection-enhanced delivery offers promise in ensuring precise drug delivery to the brain. Critical to success is the identification of glioblastoma patient populations that benefit from EGFR inhibitors. Tools like radiolabeled anti-EGFR antibody 806i facilitate the visualization of EGFR conformations, aiding in tailored treatment selection. Recognizing the synergistic potential of combination therapies with downstream targets like mTOR, PI3k, and HDACs is pivotal for enhancing EGFR inhibitor efficacy. In conclusion, the era of precision oncology holds promise for targeting EGFR in glioblastoma, contingent on tailored treatments, effective blood-brain barrier navigation, and the exploration of synergistic therapies.
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Affiliation(s)
- Shawyon Ezzati
- California Northstate University College of Medicine, Elk Grove, CA 95757, USA; (S.E.); (S.S.)
| | - Samuel Salib
- California Northstate University College of Medicine, Elk Grove, CA 95757, USA; (S.E.); (S.S.)
| | | | - Orwa Aboud
- Department of Neurology, Department of Neurological Surgery, Comprehensive Cancer Center, University of California, Davis, Sacramento, CA 95817, USA
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2
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Aldaz P, Arozarena I. Tyrosine Kinase Inhibitors in Adult Glioblastoma: An (Un)Closed Chapter? Cancers (Basel) 2021; 13:5799. [PMID: 34830952 PMCID: PMC8616487 DOI: 10.3390/cancers13225799] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2021] [Revised: 11/12/2021] [Accepted: 11/17/2021] [Indexed: 12/12/2022] Open
Abstract
Glioblastoma (GBM) is the most common and lethal form of malignant brain tumor. GBM patients normally undergo surgery plus adjuvant radiotherapy followed by chemotherapy. Numerous studies into the molecular events driving GBM highlight the central role played by the Epidermal Growth Factor Receptor (EGFR), as well as the Platelet-derived Growth Factor Receptors PDGFRA and PDGFRB in tumor initiation and progression. Despite strong preclinical evidence for the therapeutic potential of tyrosine kinase inhibitors (TKIs) that target EGFR, PDGFRs, and other tyrosine kinases, clinical trials performed during the last 20 years have not led to the desired therapeutic breakthrough for GBM patients. While clinical trials are still ongoing, in the medical community there is the perception of TKIs as a lost opportunity in the fight against GBM. In this article, we review the scientific rationale for the use of TKIs targeting glioma drivers. We critically analyze the potential causes for the failure of TKIs in the treatment of GBM, and we propose alternative approaches to the clinical evaluation of TKIs in GBM patients.
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Affiliation(s)
- Paula Aldaz
- Cancer Signaling Unit, Navarrabiomed, Hospital Universitario de Navarra (HUN), Universidad Pública de Navarra (UPNA), 31008 Pamplona, Spain
- Health Research Institute of Navarre (IdiSNA), 31008 Pamplona, Spain
| | - Imanol Arozarena
- Cancer Signaling Unit, Navarrabiomed, Hospital Universitario de Navarra (HUN), Universidad Pública de Navarra (UPNA), 31008 Pamplona, Spain
- Health Research Institute of Navarre (IdiSNA), 31008 Pamplona, Spain
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3
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A cancer drug atlas enables synergistic targeting of independent drug vulnerabilities. Nat Commun 2020; 11:2935. [PMID: 32523045 PMCID: PMC7287046 DOI: 10.1038/s41467-020-16735-2] [Citation(s) in RCA: 42] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2019] [Accepted: 05/06/2020] [Indexed: 12/13/2022] Open
Abstract
Personalized cancer treatments using combinations of drugs with a synergistic effect is attractive but proves to be highly challenging. Here we present an approach to uncover the efficacy of drug combinations based on the analysis of mono-drug effects. For this we used dose-response data from pharmacogenomic encyclopedias and represent these as a drug atlas. The drug atlas represents the relations between drug effects and allows to identify independent processes for which the tumor might be particularly vulnerable when attacked by two drugs. Our approach enables the prediction of combination-therapy which can be linked to tumor-driving mutations. By using this strategy, we can uncover potential effective drug combinations on a pan-cancer scale. Predicted synergies are provided and have been validated in glioblastoma, breast cancer, melanoma and leukemia mouse-models, resulting in therapeutic synergy in 75% of the tested models. This indicates that we can accurately predict effective drug combinations with translational value.
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4
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Garcia-Fabiani MB, Ventosa M, Comba A, Candolfi M, Nicola Candia AJ, Alghamri MS, Kadiyala P, Carney S, Faisal SM, Schwendeman A, Moon JJ, Scheetz L, Lahann J, Mauser A, Lowenstein PR, Castro MG. Immunotherapy for gliomas: shedding light on progress in preclinical and clinical development. Expert Opin Investig Drugs 2020; 29:659-684. [PMID: 32400216 DOI: 10.1080/13543784.2020.1768528] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
INTRODUCTION Gliomas are infiltrating brain tumors associated with high morbidity and mortality. Current standard of care includes radiation, chemotherapy, and surgical resection. Today, survival rates for malignant glioma patients remain dismal and unchanged for decades. The glioma microenvironment is highly immunosuppressive and consequently this has motivated the development of immunotherapies for counteracting this condition, enabling the immune cells within the tumor microenvironment to react against this tumor. AREAS COVERED The authors discuss immunotherapeutic strategies for glioma in phase-I/II clinical trials and illuminate their mechanisms of action, limitations, and key challenges. They also examine promising approaches under preclinical development. EXPERT OPINION In the last decade there has been an expansion in immune-mediated anti-cancer therapies. In the glioma field, sophisticated strategies have been successfully implemented in preclinical models. Unfortunately, clinical trials have not yet yielded consistent results for glioma patients. This could be attributed to our limited understanding of the complex immune cell infiltration and its interaction with the tumor cells, the selected time for treatment, the combination with other therapies and the route of administration of the agent. Applying these modalities to treat malignant glioma is challenging, but many new alternatives are emerging to by-pass these hurdles.
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Affiliation(s)
- Maria B Garcia-Fabiani
- Department of Neurosurgery, University of Michigan Medical School , Ann Arbor, MI, USA.,Department of Cell and Developmental Biology, University of Michigan Medical School , Ann Arbor, MI, USA
| | - Maria Ventosa
- Department of Neurosurgery, University of Michigan Medical School , Ann Arbor, MI, USA.,Department of Cell and Developmental Biology, University of Michigan Medical School , Ann Arbor, MI, USA
| | - Andrea Comba
- Department of Neurosurgery, University of Michigan Medical School , Ann Arbor, MI, USA.,Department of Cell and Developmental Biology, University of Michigan Medical School , Ann Arbor, MI, USA
| | - Marianela Candolfi
- Instituto de Investigaciones Biomédicas (INBIOMED, UBA-CONICET), Facultad de Medicina, Universidad de Buenos Aires , Buenos Aires, Argentina
| | - Alejandro J Nicola Candia
- Instituto de Investigaciones Biomédicas (INBIOMED, UBA-CONICET), Facultad de Medicina, Universidad de Buenos Aires , Buenos Aires, Argentina
| | - Mahmoud S Alghamri
- Department of Neurosurgery, University of Michigan Medical School , Ann Arbor, MI, USA.,Department of Cell and Developmental Biology, University of Michigan Medical School , Ann Arbor, MI, USA
| | - Padma Kadiyala
- Department of Neurosurgery, University of Michigan Medical School , Ann Arbor, MI, USA.,Department of Cell and Developmental Biology, University of Michigan Medical School , Ann Arbor, MI, USA
| | - Stephen Carney
- Department of Neurosurgery, University of Michigan Medical School , Ann Arbor, MI, USA.,Cancer Biology Graduate Program, University of Michigan Medical School , Ann Arbor, MI, USA
| | - Syed M Faisal
- Department of Neurosurgery, University of Michigan Medical School , Ann Arbor, MI, USA.,Department of Cell and Developmental Biology, University of Michigan Medical School , Ann Arbor, MI, USA
| | - Anna Schwendeman
- Department of Pharmaceutical Sciences, University of Michigan , Ann Arbor, MI, USA.,Biointerfaces Institute, University of Michigan , Ann Arbor, MI, USA
| | - James J Moon
- Department of Pharmaceutical Sciences, University of Michigan , Ann Arbor, MI, USA.,Biointerfaces Institute, University of Michigan , Ann Arbor, MI, USA.,Department of Biomedical Engineering, University of Michigan , Ann Arbor, MI, USA
| | - Lindsay Scheetz
- Department of Pharmaceutical Sciences, University of Michigan , Ann Arbor, MI, USA.,Biointerfaces Institute, University of Michigan , Ann Arbor, MI, USA
| | - Joerg Lahann
- Biointerfaces Institute, University of Michigan , Ann Arbor, MI, USA.,Department of Chemical Engineering, University of Michigan , Ann Arbor, MI, USA
| | - Ava Mauser
- Biointerfaces Institute, University of Michigan , Ann Arbor, MI, USA.,Department of Chemical Engineering, University of Michigan , Ann Arbor, MI, USA
| | - Pedro R Lowenstein
- Department of Neurosurgery, University of Michigan Medical School , Ann Arbor, MI, USA.,Department of Cell and Developmental Biology, University of Michigan Medical School , Ann Arbor, MI, USA.,Biointerfaces Institute, University of Michigan , Ann Arbor, MI, USA
| | - Maria G Castro
- Department of Neurosurgery, University of Michigan Medical School , Ann Arbor, MI, USA.,Department of Cell and Developmental Biology, University of Michigan Medical School , Ann Arbor, MI, USA.,Biointerfaces Institute, University of Michigan , Ann Arbor, MI, USA
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5
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Zhang Y, Sun J, Tan M, Liu Y, Li Q, Jiang H, Wang H, Li Z, Wan W, Jiang H, Lu H, Wang B, Ren J, Gong L. Species-Specific Involvement of Integrin αIIbβ3 in a Monoclonal Antibody CH12 Triggers Off-Target Thrombocytopenia in Cynomolgus Monkeys. Mol Ther 2018; 26:1457-1470. [PMID: 29724685 DOI: 10.1016/j.ymthe.2018.04.005] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2017] [Revised: 03/27/2018] [Accepted: 04/04/2018] [Indexed: 12/21/2022] Open
Abstract
CH12 is a novel humanized monoclonal antibody against epidermal growth factor receptor variant III (EGFRvIII) for cancer treatment. Unfortunately, in pre-clinical safety evaluation studies, acute thrombocytopenia was observed after administration of CH12 in cynomolgus monkeys, but not rats. More importantly, in vitro experiments found that CH12 can bind and activate platelets in cynomolgus monkey, but not human peripheral blood samples. Cynomolgus monkey-specific thrombocytopenia has been reported previously; however, the underlying mechanism remains unclear. Here, we first showed that CH12 induced thrombocytopenia in cynomolgus monkeys through off-target platelet binding and activation, resulting in platelet destruction. We subsequently found that integrin αIIbβ3 (which is expressed on platelets) contributed to this off-target toxicity. Furthermore, three-dimensional structural modeling of the αIIbβ3 molecules in cynomolgus monkeys, humans, and rats suggested that an additional unique loop exists in the ligand-binding pocket of the αIIb subunit in cynomolgus monkeys, which may explain why CH12 binds to platelets only in cynomolgus monkeys. Moreover, this study supported the hypothesis that the minor differences between cynomolgus monkeys and humans can confuse human risk assessments and suggests that species differences can help the prediction of human risks and avoid losses in drug development.
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Affiliation(s)
- Yiting Zhang
- Center for Drug Safety Evaluation and Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 201203, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Jianhua Sun
- Center for Drug Safety Evaluation and Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 201203, China
| | - Minjia Tan
- University of Chinese Academy of Sciences, Beijing 100049, China; The Chemical Proteomics Center and State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 201203, China
| | - Yongzhen Liu
- Center for Drug Safety Evaluation and Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 201203, China
| | - Qian Li
- University of Chinese Academy of Sciences, Beijing 100049, China; The Chemical Proteomics Center and State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 201203, China
| | - Hua Jiang
- State Key Laboratory of Oncogenes and Related Genes, Shanghai Cancer Institute, Renji Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200032, China
| | - Huamao Wang
- State Key Laboratory of Oncogenes and Related Genes, Shanghai Cancer Institute, Renji Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200032, China
| | - Zonghai Li
- State Key Laboratory of Oncogenes and Related Genes, Shanghai Cancer Institute, Renji Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200032, China
| | - Wei Wan
- University of Chinese Academy of Sciences, Beijing 100049, China; Drug Discovery and Design Center, State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 201203, China
| | - Hualiang Jiang
- University of Chinese Academy of Sciences, Beijing 100049, China; Drug Discovery and Design Center, State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 201203, China
| | - Henglei Lu
- Center for Drug Safety Evaluation and Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 201203, China
| | - Bingshun Wang
- Department of Biostatistics, Shanghai Jiao Tong University School of Medicine, Shanghai 200025, China
| | - Jin Ren
- Center for Drug Safety Evaluation and Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 201203, China; University of Chinese Academy of Sciences, Beijing 100049, China.
| | - Likun Gong
- Center for Drug Safety Evaluation and Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 201203, China; University of Chinese Academy of Sciences, Beijing 100049, China.
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6
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Zhu H, Chen D, Tang J, Huang C, Lv S, Wang D, Li G. Overexpression of centrosomal protein 55 regulates the proliferation of glioma cell and mediates proliferation promoted by EGFRvIII in glioblastoma U251 cells. Oncol Lett 2017; 15:2700-2706. [PMID: 29434995 DOI: 10.3892/ol.2017.7573] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2017] [Accepted: 11/23/2017] [Indexed: 12/28/2022] Open
Abstract
The epidermal growth factor receptor (EGFR) is often amplified in glioma, with the most common extracellular domain mutation being EGFR variant III (EGFRvIII). Abnormal EGFRvIII signaling has been shown to be important in driving tumor progression. Centrosomal protein 55 (CEP55), a member of the centrosomal relative proteins family, participates cytokinesis in the cell cycle. It exists in a few normal tissues and various tumor cells. The expression and function of CEP55 in human glioma cells need to investigate. In this study, the expression of CEP55 was detected in 40 cases of glioma tissues and 10 cases of non-tumor brain tissue. The proliferation of glioblastoma U251 cells was analyzed after transfection with EGFRvIII and CEP55 siRNA. We found that the expression of CEP55 was increased significantly in the glioma tissues than in normal brain tissue. The proliferation of U251 cells increased remarkably after transfection with EGFRvIII. Knockdown of CEP55 inhibited proliferation of U251 cells and was able to eliminate the effect of promoting proliferation induced by EGFRvIII in U251 cells. CEP55 played a key role in the proliferation of glioma cells and mediated EGFRvIII-stimulated proliferation in glioma cells. CEP55 might be a novel molecular therapeutic target in patients with gliomas expressing EGFRvIII.
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Affiliation(s)
- Hongfan Zhu
- Institute for Cancer Research in People's Liberation Army, Xinqiao Hospital, The Third Military Medical University, P.R. China
| | - Diangang Chen
- Institute for Cancer Research in People's Liberation Army, Xinqiao Hospital, The Third Military Medical University, P.R. China
| | - Jinliang Tang
- Department of Pathology, Xinqiao Hospital, The Third Military Medical University, P.R. China
| | - Changlin Huang
- Institute for Cancer Research in People's Liberation Army, Xinqiao Hospital, The Third Military Medical University, P.R. China
| | - Shengqing Lv
- Department of Neurosurgery, Xinqiao Hospital, The Third Military Medical University, P.R. China
| | - Donglin Wang
- Department of Oncology, Cancer Hospital of Chongqing, Chongqing 400037, P.R. China
| | - Guanghui Li
- Institute for Cancer Research in People's Liberation Army, Xinqiao Hospital, The Third Military Medical University, P.R. China
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7
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Játiva P, Ceña V. Use of nanoparticles for glioblastoma treatment: a new approach. Nanomedicine (Lond) 2017; 12:2533-2554. [DOI: 10.2217/nnm-2017-0223] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Glioblastoma (GBM) is a very aggressive CNS tumor with poor prognosis. Current treatment lacks efficacy indicating that new therapeutic approaches are needed. One of these new approaches is based on the use of nanoparticles (NPs) to deliver different cargos (antitumoral drugs or genetic materials) to tumoral cells. This review covers the signaling pathways altered in GBM cells to understand the rationale behind choosing new therapeutic targets and recent advances in the use of different NPs to deliver to GBM cells, both in vitro and in vivo, different therapeutic molecules. A special focus is placed on the effect of NPs on orthotopic brain tumors since this animal model represents the optimal model for translational purposes.
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Affiliation(s)
- Pablo Játiva
- Unidad Asociada Neurodeath, Universidad de Castilla-La Mancha, Albacete, Spain
- CIBERNED, Instituto de Salud Carlos III, Madrid, Spain
| | - Valentín Ceña
- Unidad Asociada Neurodeath, Universidad de Castilla-La Mancha, Albacete, Spain
- CIBERNED, Instituto de Salud Carlos III, Madrid, Spain
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8
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Razpotnik R, Novak N, Čurin Šerbec V, Rajcevic U. Targeting Malignant Brain Tumors with Antibodies. Front Immunol 2017; 8:1181. [PMID: 28993773 PMCID: PMC5622144 DOI: 10.3389/fimmu.2017.01181] [Citation(s) in RCA: 44] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2017] [Accepted: 09/06/2017] [Indexed: 12/31/2022] Open
Abstract
Antibodies have been shown to be a potent therapeutic tool. However, their use for targeting brain diseases, including neurodegenerative diseases and brain cancers, has been limited, particularly because the blood–brain barrier (BBB) makes brain tissue hard to access by conventional antibody-targeting strategies. In this review, we summarize new antibody therapeutic approaches to target brain tumors, especially malignant gliomas, as well as their potential drawbacks. Many different brain delivery platforms for antibodies have been studied such as liposomes, nanoparticle-based systems, cell-penetrating peptides (CPPs), and cell-based approaches. We have already shown the successful delivery of single-chain fragment variable (scFv) with CPP as a linker between two variable domains in the brain. Antibodies normally face poor penetration through the BBB, with some variants sufficiently passing the barrier on their own. A “Trojan horse” method allows passage of biomolecules, such as antibodies, through the BBB by receptor-mediated transcytosis (RMT). Such examples of therapeutic antibodies are the bispecific antibodies where one binding specificity recognizes and binds a BBB receptor, enabling RMT and where a second binding specificity recognizes an antigen as a therapeutic target. On the other hand, cell-based systems such as stem cells (SCs) are a promising delivery system because of their tumor tropism and ability to cross the BBB. Genetically engineered SCs can be used in gene therapy, where they express anti-tumor drugs, including antibodies. Different types and sources of SCs have been studied for the delivery of therapeutics to the brain; both mesenchymal stem cells (MSCs) and neural stem cells (NSCs) show great potential. Following the success in treatment of leukemias and lymphomas, the adoptive T-cell therapies, especially the chimeric antigen receptor-T cells (CAR-Ts), are making their way into glioma treatment as another type of cell-based therapy using the antibody to bind to the specific target(s). Finally, the current clinical trials are reviewed, showing the most recent progress of attractive approaches to deliver therapeutic antibodies across the BBB aiming at the specific antigen.
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Affiliation(s)
- Rok Razpotnik
- Department of Research and Development, Blood Transfusion Centre of Slovenia, Ljubljana, Slovenia
| | - Neža Novak
- Department of Research and Development, Blood Transfusion Centre of Slovenia, Ljubljana, Slovenia
| | - Vladka Čurin Šerbec
- Department of Research and Development, Blood Transfusion Centre of Slovenia, Ljubljana, Slovenia
| | - Uros Rajcevic
- Department of Research and Development, Blood Transfusion Centre of Slovenia, Ljubljana, Slovenia
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9
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Phosphatases and solid tumors: focus on glioblastoma initiation, progression and recurrences. Biochem J 2017; 474:2903-2924. [PMID: 28801478 DOI: 10.1042/bcj20170112] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2017] [Revised: 06/21/2017] [Accepted: 06/23/2017] [Indexed: 12/15/2022]
Abstract
Phosphatases and cancer have been related for many years now, as these enzymes regulate key cellular functions, including cell survival, migration, differentiation and proliferation. Dysfunctions or mutations affecting these enzymes have been demonstrated to be key factors for oncogenesis. The aim of this review is to shed light on the role of four different phosphatases (PTEN, PP2A, CDC25 and DUSP1) in five different solid tumors (breast cancer, lung cancer, pancreatic cancer, prostate cancer and ovarian cancer), in order to better understand the most frequent and aggressive primary cancer of the central nervous system, glioblastoma.
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10
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Keller S, Schmidt MHH. EGFR and EGFRvIII Promote Angiogenesis and Cell Invasion in Glioblastoma: Combination Therapies for an Effective Treatment. Int J Mol Sci 2017. [PMID: 28629170 PMCID: PMC5486116 DOI: 10.3390/ijms18061295] [Citation(s) in RCA: 78] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Epidermal growth factor receptor (EGFR) and the mutant EGFRvIII are major focal points in current concepts of targeted cancer therapy for glioblastoma multiforme (GBM), the most malignant primary brain tumor. The receptors participate in the key processes of tumor cell invasion and tumor-related angiogenesis and their upregulation correlates with the poor prognosis of glioma patients. Glioma cell invasion and increased angiogenesis share mechanisms of the degradation of the extracellular matrix (ECM) through upregulation of ECM-degrading proteases as well as the activation of aberrant signaling pathways. This review describes the role of EGFR and EGFRvIII in those mechanisms which might offer new combined therapeutic approaches targeting EGFR or EGFRvIII together with drug treatments against proteases of the ECM or downstream signaling to increase the inhibitory effects of mono-therapies.
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Affiliation(s)
- Stefanie Keller
- Molecular Signal Transduction Laboratories, Institute for Microscopic Anatomy and Neurobiology, Focus Program Translational Neuroscience (FTN), Rhine Mainz Neuroscience Network (rmn2), Johannes Gutenberg University, School of Medicine, 55131 Mainz, Germany.
| | - Mirko H H Schmidt
- Molecular Signal Transduction Laboratories, Institute for Microscopic Anatomy and Neurobiology, Focus Program Translational Neuroscience (FTN), Rhine Mainz Neuroscience Network (rmn2), Johannes Gutenberg University, School of Medicine, 55131 Mainz, Germany.
- German Cancer Consortium (DKTK), partner site Frankfurt/Mainz, 55131 Mainz, Germany.
- German Cancer Research Center (DKFZ), 69120 Heidelberg, Germany.
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11
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Ellwanger K, Reusch U, Fucek I, Knackmuss S, Weichel M, Gantke T, Molkenthin V, Zhukovsky EA, Tesar M, Treder M. Highly Specific and Effective Targeting of EGFRvIII-Positive Tumors with TandAb Antibodies. Front Oncol 2017; 7:100. [PMID: 28596941 PMCID: PMC5442391 DOI: 10.3389/fonc.2017.00100] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2017] [Accepted: 05/01/2017] [Indexed: 12/31/2022] Open
Abstract
To harness the cytotoxic capacity of immune cells for the treatment of solid tumors, we developed tetravalent, bispecific tandem diabody (TandAb) antibodies that recognize EGFRvIII, the deletion variant III of the epidermal growth factor receptor (EGFR), and CD3 on T-cells, thereby directing immune cells to eliminate EGFRvIII-positive tumor cells. Using phage display, we identified scFv antibodies selectively binding to EGFRvIII. These highly EGFRvIII-specific, fully human scFv were substantially improved by affinity maturation, achieving KDs in the picomolar range, and were used to construct a set of bispecific EGFRvIII-targeting TandAbs with a broad range of binding and cytotoxic properties. These antibodies exhibited an exquisite specificity for a distinguished epitope in the N-terminal portion of EGFRvIII, as shown on recombinant antigen in Western Blot, SPR, and ELISA, as well as on antigen-expressing cells in FACS assays, and did not bind to the wild-type EGFR. High-affinity EGFRvIII/CD3 TandAbs were most potent in killing assays, displaying cytotoxicity toward EGFRvIII-expressing CHO, F98 glioma, or human DK-MG cells with EC50 values in the range of 1-10 pM in vitro. They also demonstrated dose-dependent growth control in vivo in an EGFRvIII-positive subcutaneous xenograft tumor model. Together with the tumor-exclusive expression of EGFRvIII, the EGFRvIII/CD3 TandAbs' high specificity and strictly target-dependent activation with no off-target activity provide an opportunity to target tumor cells and spare normal tissues, thereby reducing the side effects associated with other anti-EGFR therapies. In summary, EGFRvIII/CD3 TandAbs are highly attractive therapeutic antibody candidates for selective immunotherapy of EGFRvIII-positive tumors.
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