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Anti-leukemia effect associated with down-regulated CD47 and up-regulated calreticulin by stimulated macrophages in co-culture. Cancer Immunol Immunother 2020; 70:787-801. [PMID: 32995942 DOI: 10.1007/s00262-020-02728-z] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2020] [Accepted: 09/15/2020] [Indexed: 02/03/2023]
Abstract
CD47 is over-expressed in Acute Myeloid Leukemia (AML) and functions as an inhibitory signal, suppressing phagocytosis by binding to signal regulatory protein α (SIRPα) on the surface of macrophages. Inhibition of CD47 restores the immune surveillance of AML cells. However, the inhibition of CD47 in AML by activated macrophages and the subsequent effects on different immune response parameters are not fully understood. Here, we demonstrate the use of a distinct co-culture method to inhibit CD47 and therefore eliminate AML cells by macrophages in vitro. Human chemically induced THP-1 macrophages were activated using different concentrations of lipopolysaccharide (LPS) and co-culturing with three AML cancer cell lines (HL-60, NB4, and THP-1), respectively, as well as normal human peripheral blood mononuclear cells (PBMC). CD47 inhibition was observed in and selective to AML but not observed in normal PBMC. Additionally, calreticulin (CRT) levels were elevated in the same cell lines simultaneously, after co-culturing with activated human macrophages, but not elevated in normal cells. We also show that the activated macrophages secreted high levels of cytokines, including IL-12p70, IL-6, and TNF-α, consistent with the elimination of AML by macrophages. Our study reveals the potential of this model for screening new drugs against AML and the possibility of using human macrophages in AML treatment in the future.
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52
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Cham LB, Adomati T, Li F, Ali M, Lang KS. CD47 as a Potential Target to Therapy for Infectious Diseases. Antibodies (Basel) 2020; 9:antib9030044. [PMID: 32882841 PMCID: PMC7551396 DOI: 10.3390/antib9030044] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2020] [Revised: 06/12/2020] [Accepted: 07/27/2020] [Indexed: 12/12/2022] Open
Abstract
The integrin associated protein (CD47) is a widely and moderately expressed glycoprotein in all healthy cells. Cancer cells are known to induce increased CD47 expression. Similar to cancer cells, all immune cells can upregulate their CD47 surface expression during infection. The CD47-SIRPa interaction induces an inhibitory effect on macrophages and dendritic cells (dendritic cells) while CD47-thrombospondin-signaling inhibits T cells. Therefore, the disruption of the CD47 interaction can mediate several biologic functions. Upon the blockade and knockout of CD47 reveals an immunosuppressive effect of CD47 during LCMV, influenza virus, HIV-1, mycobacterium tuberculosis, plasmodium and other bacterial pneumonia infections. In our recent study we shows that the blockade of CD47 using the anti-CD47 antibody increases the activation and effector function of macrophages, dendritic cells and T cells during viral infection. By enhancing both innate and adaptive immunity, CD47 blocking antibody promotes antiviral effect. Due to its broad mode of action, the immune-stimulatory effect derived from this antibody could be applicable in nonresolving and (re)emerging infections. The anti-CD47 antibody is currently under clinical trial for the treatment of cancer and could also have amenable therapeutic potential against infectious diseases. This review highlights the immunotherapeutic targeted role of CD47 in the infectious disease realm.
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Gardner TJ, Bourne CM, Dacek MM, Kurtz K, Malviya M, Peraro L, Silberman PC, Vogt KC, Unti MJ, Brentjens R, Scheinberg D. Targeted Cellular Micropharmacies: Cells Engineered for Localized Drug Delivery. Cancers (Basel) 2020; 12:E2175. [PMID: 32764348 PMCID: PMC7465970 DOI: 10.3390/cancers12082175] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2020] [Revised: 07/31/2020] [Accepted: 08/02/2020] [Indexed: 12/19/2022] Open
Abstract
The recent emergence of engineered cellular therapies, such as Chimeric antigen receptor (CAR) CAR T and T cell receptor (TCR) engineered T cells, has shown great promise in the treatment of various cancers. These agents aggregate and expand exponentially at the tumor site, resulting in potent immune activation and tumor clearance. Moreover, the ability to elaborate these cells with therapeutic agents, such as antibodies, enzymes, and immunostimulatory molecules, presents an unprecedented opportunity to specifically modulate the tumor microenvironment through cell-mediated drug delivery. This unique pharmacology, combined with significant advances in synthetic biology and cell engineering, has established a new paradigm for cells as vectors for drug delivery. Targeted cellular micropharmacies (TCMs) are a revolutionary new class of living drugs, which we envision will play an important role in cancer medicine and beyond. Here, we review important advances and considerations underway in developing this promising advancement in biological therapeutics.
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Affiliation(s)
- Thomas J. Gardner
- Molecular Pharmacology Program, Sloan Kettering Institute, New York, NY 10065, USA; (T.J.G.); (C.M.B.); (M.M.D.); (K.K.); (M.M.); (L.P.); (P.C.S.); (K.C.V.)
| | - Christopher M. Bourne
- Molecular Pharmacology Program, Sloan Kettering Institute, New York, NY 10065, USA; (T.J.G.); (C.M.B.); (M.M.D.); (K.K.); (M.M.); (L.P.); (P.C.S.); (K.C.V.)
- Immunology Program, Weill Cornell Graduate School of Medical Sciences, New York, NY 10065, USA
| | - Megan M. Dacek
- Molecular Pharmacology Program, Sloan Kettering Institute, New York, NY 10065, USA; (T.J.G.); (C.M.B.); (M.M.D.); (K.K.); (M.M.); (L.P.); (P.C.S.); (K.C.V.)
- Pharmacology Program, Weill Cornell Graduate School of Medical Sciences, New York, NY 10065, USA;
| | - Keifer Kurtz
- Molecular Pharmacology Program, Sloan Kettering Institute, New York, NY 10065, USA; (T.J.G.); (C.M.B.); (M.M.D.); (K.K.); (M.M.); (L.P.); (P.C.S.); (K.C.V.)
- Pharmacology Program, Weill Cornell Graduate School of Medical Sciences, New York, NY 10065, USA;
| | - Manish Malviya
- Molecular Pharmacology Program, Sloan Kettering Institute, New York, NY 10065, USA; (T.J.G.); (C.M.B.); (M.M.D.); (K.K.); (M.M.); (L.P.); (P.C.S.); (K.C.V.)
| | - Leila Peraro
- Molecular Pharmacology Program, Sloan Kettering Institute, New York, NY 10065, USA; (T.J.G.); (C.M.B.); (M.M.D.); (K.K.); (M.M.); (L.P.); (P.C.S.); (K.C.V.)
| | - Pedro C. Silberman
- Molecular Pharmacology Program, Sloan Kettering Institute, New York, NY 10065, USA; (T.J.G.); (C.M.B.); (M.M.D.); (K.K.); (M.M.); (L.P.); (P.C.S.); (K.C.V.)
- Pharmacology Program, Weill Cornell Graduate School of Medical Sciences, New York, NY 10065, USA;
| | - Kristen C. Vogt
- Molecular Pharmacology Program, Sloan Kettering Institute, New York, NY 10065, USA; (T.J.G.); (C.M.B.); (M.M.D.); (K.K.); (M.M.); (L.P.); (P.C.S.); (K.C.V.)
- Tri-Institutional PhD Program in Chemical Biology, Memorial Sloan Kettering Cancer Center, New York, NY 10065, USA
| | - Mildred J. Unti
- Pharmacology Program, Weill Cornell Graduate School of Medical Sciences, New York, NY 10065, USA;
| | - Renier Brentjens
- Department of Medicine, Memorial Hospital, New York, NY 10065, USA;
| | - David Scheinberg
- Molecular Pharmacology Program, Sloan Kettering Institute, New York, NY 10065, USA; (T.J.G.); (C.M.B.); (M.M.D.); (K.K.); (M.M.); (L.P.); (P.C.S.); (K.C.V.)
- Pharmacology Program, Weill Cornell Graduate School of Medical Sciences, New York, NY 10065, USA;
- Department of Medicine, Memorial Hospital, New York, NY 10065, USA;
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Yuan C, Liu Y, Wang T, Sun M, Chen X. Nanomaterials as Smart Immunomodulator Delivery System for Enhanced Cancer Therapy. ACS Biomater Sci Eng 2020; 6:4774-4798. [DOI: 10.1021/acsbiomaterials.0c00804] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Congshan Yuan
- College of Marine Life Science, Ocean University of China, Qingdao 266003, P.R. China
| | - Ya Liu
- College of Marine Life Science, Ocean University of China, Qingdao 266003, P.R. China
| | - Ting Wang
- College of Marine Life Science, Ocean University of China, Qingdao 266003, P.R. China
| | - Mengjie Sun
- College of Marine Life Science, Ocean University of China, Qingdao 266003, P.R. China
| | - Xiguang Chen
- College of Marine Life Science, Ocean University of China, Qingdao 266003, P.R. China
- Qingdao National Laboratory for Marine Science and Technology, Qingdao 266000, P.R. China
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55
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Recent Advancements in CD47 Signal Transduction Pathways Involved in Vascular Diseases. BIOMED RESEARCH INTERNATIONAL 2020; 2020:4749135. [PMID: 32733941 PMCID: PMC7378613 DOI: 10.1155/2020/4749135] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 01/10/2020] [Accepted: 04/09/2020] [Indexed: 12/18/2022]
Abstract
Cardiovascular and cerebrovascular diseases caused by atherosclerosis have a high disability rate and reduce the quality of life of the population. Therefore, understanding the mechanism of atherosclerosis and its control may interfere with the progression of atherosclerosis and thus control the occurrence of diseases closely related to atherosclerosis. TSP-1 is a factor that has been found to have an antiangiogenic effect, and CD47, as the receptor of TSP-1, can participate in the regulation of antiangiogenesis of atherosclerosis. VEGF is an important regulator of angiogenesis, and TSP-1/CD47 can cause VEGF and its downstream expression. Therefore, the TSP-1/CD47/VEGF/VEGFR2 signal may have an important influence on atherosclerosis. In addition, some inflammatory factors, such as IL-1 and NLRP3, can also affect atherosclerosis. This review will be expounded focusing on the pathogenesis and influencing factors of atherosclerosis.
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Ciner AT, Jones K, Muschel RJ, Brodt P. The unique immune microenvironment of liver metastases: Challenges and opportunities. Semin Cancer Biol 2020; 71:143-156. [PMID: 32526354 DOI: 10.1016/j.semcancer.2020.06.003] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2020] [Revised: 06/04/2020] [Accepted: 06/05/2020] [Indexed: 02/07/2023]
Abstract
Liver metastases from gastrointestinal and non-gastrointestinal malignancies remain a major cause of cancer-related mortality and a major clinical challenge. The liver has unique properties that facilitate metastatic expansion, including a complex immune system that evolved to dampen immunity to neoantigens entering the liver from the gut, through the portal circulation. In this review, we describe the unique microenvironment encountered by cancer cells in the liver, focusing on elements of the innate and adaptive immune response that can act as a double-edge sword, contributing to the elimination of cancer cells on the one hand and promoting their survival and growth, on the other. We discuss this microenvironment in a clinical context, particularly for colorectal carcinoma, and highlight how a better understanding of the role of the microenvironment has spurred an intense effort to develop novel and innovative strategies for targeting liver metastatic disease, some of which are currently being tested in the clinic.
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Affiliation(s)
- Aaron T Ciner
- Rutgers Cancer Institute of New Jersey, New Brunswick, NJ, United States
| | - Keaton Jones
- Oxford Institute for Radiation Oncology, Department of Surgery, University of Oxford, Oxford, UK
| | - Ruth J Muschel
- Oxford Institute for Radiation Oncology, Department of Oncology, University of Oxford, Oxford, UK
| | - Pnina Brodt
- Departments of Surgery, Medicine and Oncology, McGill University, and the Research Institute of the McGill University Health Center, Montreal, QC, Canada.
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Fam SY, Chee CF, Yong CY, Ho KL, Mariatulqabtiah AR, Tan WS. Stealth Coating of Nanoparticles in Drug-Delivery Systems. NANOMATERIALS (BASEL, SWITZERLAND) 2020; 10:E787. [PMID: 32325941 PMCID: PMC7221919 DOI: 10.3390/nano10040787] [Citation(s) in RCA: 177] [Impact Index Per Article: 44.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/19/2020] [Revised: 03/06/2020] [Accepted: 03/07/2020] [Indexed: 01/01/2023]
Abstract
Nanoparticles (NPs) have emerged as a powerful drug-delivery tool for cancer therapies to enhance the specificity of drug actions, while reducing the systemic side effects. Nonetheless, NPs interact massively with the surrounding physiological environments including plasma proteins upon administration into the bloodstream. Consequently, they are rapidly cleared from the blood circulation by the mononuclear phagocyte system (MPS) or complement system, resulting in a premature elimination that will cause the drug release at off-target sites. By grafting a stealth coating layer onto the surface of NPs, the blood circulation half-life of nanomaterials can be improved by escaping the recognition and clearance of the immune system. This review focuses on the basic concept underlying the stealth behavior of NPs by polymer coating, whereby the fundamental surface coating characteristics such as molecular weight, surface chain density as well as conformations of polymer chains are of utmost importance for efficient protection of NPs. In addition, the most commonly used stealth polymers such as poly(ethylene glycol) (PEG), poly(2-oxazoline) (POx), and poly(zwitterions) in developing long-circulating NPs for drug delivery are also thoroughly discussed. The biomimetic strategies, including the cell-membrane camouflaging technique and CD47 functionalization for the development of stealth nano-delivery systems, are highlighted in this review as well.
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Affiliation(s)
- See Yee Fam
- Department of Microbiology, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia, Serdang 43400, Malaysia; (S.Y.F.); (C.Y.Y.)
| | - Chin Fei Chee
- Nanotechnology and Catalysis Research Centre, University of Malaya, Kuala Lumpur 50603, Malaysia;
| | - Chean Yeah Yong
- Department of Microbiology, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia, Serdang 43400, Malaysia; (S.Y.F.); (C.Y.Y.)
| | - Kok Lian Ho
- Department of Pathology, Faculty of Medicine and Health Sciences, Universiti Putra Malaysia, Serdang 43400, Malaysia;
| | - Abdul Razak Mariatulqabtiah
- Department of Cell and Molecular Biology, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia, Serdang 43400, Malaysia;
- Laboratory of Vaccines and Immunotherapeutics, Institute of Bioscience, Universiti Putra Malaysia, Serdang 43400, Malaysia
| | - Wen Siang Tan
- Department of Microbiology, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia, Serdang 43400, Malaysia; (S.Y.F.); (C.Y.Y.)
- Laboratory of Vaccines and Immunotherapeutics, Institute of Bioscience, Universiti Putra Malaysia, Serdang 43400, Malaysia
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58
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MicroRNA-200a Promotes Phagocytosis of Macrophages and Suppresses Cell Proliferation, Migration, and Invasion in Nasopharyngeal Carcinoma by Targeting CD47. BIOMED RESEARCH INTERNATIONAL 2020; 2020:3723781. [PMID: 32149101 PMCID: PMC7054800 DOI: 10.1155/2020/3723781] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/15/2019] [Accepted: 12/18/2019] [Indexed: 01/29/2023]
Abstract
Nasopharyngeal carcinoma (NPC) causes severe oncogenic lesions in the nasopharynx. CD47, a transmembrane integrin-associated protein, plays a key role in the ability of tumor cells to escape phagocytosis, working as an immune checkpoint in the immune response. Besides this role, CD47 has been reported to regulate cell proliferation and migration. The present study addresses the relationship between CD47 and microRNA-200a and examines their regulatory mechanisms in NPC. Bioinformatics analyses and dual-luciferase reporter assays were used to confirm the putative relationship between miR-200a and CD47, and their interaction was further detected using western blotting and RT-PCR. Further, results showed that miR-200a affect NPC cell proliferation, migration, and invasion by regulating CD47. A cell phagocytosis assay showed that miR-200a and a CD47 monoclonal antibody increased the sensitivity of NPC cells to macrophage phagocytosis by inhibiting the functions of CD47. Additionally, miR-200a expression was suppressed and CD47 expression increased in both clinical NPC tissues and cell lines. Taken together, these results show the miR-200a/CD47 combination as a potential therapeutic for treatment of NPC.
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Targeting CD47 as a Novel Immunotherapy for Multiple Myeloma. Cancers (Basel) 2020; 12:cancers12020305. [PMID: 32012878 PMCID: PMC7072283 DOI: 10.3390/cancers12020305] [Citation(s) in RCA: 52] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2019] [Revised: 01/17/2020] [Accepted: 01/22/2020] [Indexed: 12/25/2022] Open
Abstract
Multiple myeloma (MM) remains to be incurable despite recent therapeutic advances. CD47, an immune checkpoint known as the "don't eat me" signal, is highly expressed on the surface of various cancers, allowing cancer cells to send inhibitory signals to macrophages and impede phagocytosis and immune response. In this study, we hypothesized that blocking the "don't eat me" signaling using an anti-CD47 monoclonal antibody will induce killing of MM cells. We report that CD47 expression was directly correlated with stage of the disease, from normal to MGUS to MM. Moreover, MM cells had remarkably higher CD47 expression than other cell populations in the bone marrow. These findings indicate that CD47 is specifically expressed on MM and can be used as a potential therapeutic target. Further, blocking of CD47 using an anti-CD47 antibody induced immediate activation of macrophages, which resulted in induction of phagocytosis and killing of MM cells in the 3D-tissue engineered bone marrow model, as early as 4 hours. These results suggest that macrophage checkpoint immunotherapy by blocking the CD47 "don't eat me" signal is a novel and promising strategy for the treatment of MM, providing a basis for additional studies to validate these effects in vivo and in patients.
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60
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Current Strategies to Target Tumor-Associated-Macrophages to Improve Anti-Tumor Immune Responses. Cells 2019; 9:cells9010046. [PMID: 31878087 PMCID: PMC7017001 DOI: 10.3390/cells9010046] [Citation(s) in RCA: 189] [Impact Index Per Article: 37.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2019] [Revised: 12/17/2019] [Accepted: 12/20/2019] [Indexed: 12/13/2022] Open
Abstract
: Established evidence demonstrates that tumor-infiltrating myeloid cells promote rather than stop-cancer progression. Tumor-associated macrophages (TAMs) are abundantly present at tumor sites, and here they support cancer proliferation and distant spreading, as well as contribute to an immune-suppressive milieu. Their pro-tumor activities hamper the response of cancer patients to conventional therapies, such as chemotherapy or radiotherapy, and also to immunotherapies based on checkpoint inhibition. Active research frontlines of the last years have investigated novel therapeutic strategies aimed at depleting TAMs and/or at reprogramming their tumor-promoting effects, with the goal of re-establishing a favorable immunological anti-tumor response within the tumor tissue. In recent years, numerous clinical trials have included pharmacological strategies to target TAMs alone or in combination with other therapies. This review summarizes the past and current knowledge available on experimental tumor models and human clinical studies targeting TAMs for cancer treatment.
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61
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Martin-Orozco E, Sanchez-Fernandez A, Ortiz-Parra I, Ayala-San Nicolas M. WNT Signaling in Tumors: The Way to Evade Drugs and Immunity. Front Immunol 2019; 10:2854. [PMID: 31921125 PMCID: PMC6934036 DOI: 10.3389/fimmu.2019.02854] [Citation(s) in RCA: 149] [Impact Index Per Article: 29.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2019] [Accepted: 11/20/2019] [Indexed: 12/19/2022] Open
Abstract
WNT/β-catenin signaling is involved in many physiological processes. Its implication in embryonic development, cell migration, and polarization has been shown. Nevertheless, alterations in this signaling have also been related with pathological events such as sustaining and proliferating the cancer stem cell (CSC) subset present in the tumor bulk. Related with this, WNT signaling has been associated with the maintenance, expansion, and epithelial-mesenchymal transition of stem cells, and furthermore with two distinctive features of this tumor population: therapeutic resistance (MDR, multidrug resistance) and immune escape. These mechanisms are developed and maintained by WNT activation through the transcriptional control of the genes involved in such processes. This review focuses on the description of the best known WNT pathways and the molecules involved in them. Special attention is given to the WNT cascade proteins deregulated in tumors, which have a decisive role in tumor survival. Some of these proteins function as extrusion pumps that, in the course of chemotherapy, expel the drugs from the cells; others help the tumoral cells hide from the immune effector mechanisms. Among the WNT targets involved in drug resistance, the drug extrusion pump MDR-1 (P-GP, ABCB1) and the cell adhesion molecules from the CD44 family are highlighted. The chemokine CCL4 and the immune checkpoint proteins CD47 and PD-L1 are included in the list of WNT target molecules with a role in immunity escape. This pathway should be a main target in cancer therapy as WNT signaling activation is essential for tumor progression and survival, even in the presence of the anti-tumoral immune response and/or antineoplastic drugs. The appropriate design and combination of anti-tumoral strategies, based on the modulation of WNT mediators and/or protein targets, could negatively affect the growth of tumoral cells, improving the efficacy of these types of therapies.
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Affiliation(s)
- Elena Martin-Orozco
- Department of Biochemistry and Molecular Biology (B) and Immunology, School of Medicine, University of Murcia, Murcia, Spain.,Biomedical Research Institute of Murcia (IMIB), ARADyAL, Murcia, Spain
| | - Ana Sanchez-Fernandez
- Department of Biochemistry and Molecular Biology (B) and Immunology, School of Medicine, University of Murcia, Murcia, Spain
| | - Irene Ortiz-Parra
- Department of Biochemistry and Molecular Biology (B) and Immunology, School of Medicine, University of Murcia, Murcia, Spain
| | - Maria Ayala-San Nicolas
- Department of Biochemistry and Molecular Biology (B) and Immunology, School of Medicine, University of Murcia, Murcia, Spain
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62
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Yang H, Shao R, Huang H, Wang X, Rong Z, Lin Y. Engineering macrophages to phagocytose cancer cells by blocking the CD47/SIRPɑ axis. Cancer Med 2019; 8:4245-4253. [PMID: 31183992 PMCID: PMC6675709 DOI: 10.1002/cam4.2332] [Citation(s) in RCA: 57] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2019] [Revised: 05/05/2019] [Accepted: 05/24/2019] [Indexed: 12/29/2022] Open
Abstract
The use of immunotherapy has achieved great advances in the treatment of cancer. Macrophages play a pivotal role in the immune defense system, serving both as phagocytes (removal of pathogens and cancer cells) and as antigen‐presenting cells (activation of T cells). However, research regarding tumor immunotherapy is mainly focused on the adaptive immune system. The usefulness of innate immune cells (eg, macrophages) in the treatment of cancer has not been extensively investigated. Recent advances in synthetic biology and the increasing understanding of the cluster of differentiation 47/signal regulatory protein alpha (CD47/SIRPɑ) axis may provide new opportunities for the clinical application of engineered macrophages. The CD47/SIRPɑ axis is a major known pathway, repressing phagocytosis and activation of macrophages. In this article, we summarize the currently available evidence regarding the CD47/SIRPɑ axis, and immunotherapies based on blockage. In addition, we propose cell therapy strategies based on macrophage engineering.
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Affiliation(s)
- Hongcheng Yang
- Cancer Research Institute, School of Basic Medical Sciences, Southern Medical University, Guangzhou, China
| | - Ruoyang Shao
- Cancer Research Institute, School of Basic Medical Sciences, Southern Medical University, Guangzhou, China
| | - Hongxin Huang
- Cancer Research Institute, School of Basic Medical Sciences, Southern Medical University, Guangzhou, China
| | - Xinlong Wang
- Cancer Research Institute, School of Basic Medical Sciences, Southern Medical University, Guangzhou, China
| | - Zhili Rong
- Cancer Research Institute, School of Basic Medical Sciences, Southern Medical University, Guangzhou, China.,Dermatology Hospital, Southern Medical University, Guangzhou, China
| | - Ying Lin
- Cancer Research Institute, School of Basic Medical Sciences, Southern Medical University, Guangzhou, China
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