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Zhang Y, Xiang J, Zhu N, Ge H, Sheng X, Deng S, Chen J, Yu L, Zhou Y, Shen J. Curcumin in combination with homoharringtonine suppresses lymphoma cell growth by inhibiting the TGF-β/Smad3 signaling pathway. Aging (Albany NY) 2021; 13:18757-18768. [PMID: 34324434 PMCID: PMC8351727 DOI: 10.18632/aging.203319] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2021] [Accepted: 06/04/2021] [Indexed: 12/19/2022]
Abstract
Both homoharringtonine (HHT) and curcumin exhibit anti-proliferative effects on lymphoma cells, but the effects of combined HHT and curcumin treatment remain unclear. Here, we investigated the effects of HHT/curcumin combination on the proliferation, apoptosis, and invasion in lymphoma cells. CCK-8, flow cytometry, and transwell assays were used to assess proliferation, apoptosis, and invasion of U937 and Raji cells. p-Smad3, E-cadherin, and N-cadherin expression were also measured in Raji cells using Western blot assays. Combination of HHT and curcumin synergistically inhibited U937 and Raji cell proliferation and invasion. In addition, the combination treatment markedly increased apoptosis of Raji cells as evidenced by increased Bax, cleaved caspase 3, and cleaved caspase 9 expression. Meanwhile, the combination treatment promoted anti-tumor mechanisms in Raji cells as indicated by decreases in p-Smad3 and N-cadherin and increases in E-cadherin. In vivo experiments showed that the combination treatment suppressed tumor growth in a mouse Raji xenograft model. Our findings indicate that combination of HHT and curcumin inhibited lymphoma cell growth by downregulating the TGF-β/Smad3 pathway. These results suggest that HHT combined with curcumin might be a promising therapeutic approach for the treatment of lymphoma.
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Affiliation(s)
- Yu Zhang
- Department of Hematology, The First Affiliated Hospital of Zhejiang Chinese Medical University, Hangzhou, Zhejiang 310006, PR China
| | - Jingjing Xiang
- Department of Hematology, The First Affiliated Hospital of Zhejiang Chinese Medical University, Hangzhou, Zhejiang 310006, PR China
| | - Ni Zhu
- Department of Hematology, The First Affiliated Hospital of Zhejiang Chinese Medical University, Hangzhou, Zhejiang 310006, PR China
| | - Hangping Ge
- Department of Hematology, The First Affiliated Hospital of Zhejiang Chinese Medical University, Hangzhou, Zhejiang 310006, PR China
| | - Xianfu Sheng
- Department of Hematology, The First Affiliated Hospital of Zhejiang Chinese Medical University, Hangzhou, Zhejiang 310006, PR China
| | - Shu Deng
- Department of Hematology, The First Affiliated Hospital of Zhejiang Chinese Medical University, Hangzhou, Zhejiang 310006, PR China
| | - Junfa Chen
- Department of Hematology, The First Affiliated Hospital of Zhejiang Chinese Medical University, Hangzhou, Zhejiang 310006, PR China
| | - Lihong Yu
- The First Medical College of Zhejiang Chinese Medical University, Hangzhou, Zhejiang 310053, PR China
| | - Yan Zhou
- The First Medical College of Zhejiang Chinese Medical University, Hangzhou, Zhejiang 310053, PR China
| | - Jianping Shen
- Department of Hematology, The First Affiliated Hospital of Zhejiang Chinese Medical University, Hangzhou, Zhejiang 310006, PR China
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2
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Shukla S, Roe AJ, Liu R, Veliz FA, Commandeur U, Wald DN, Steinmetz NF. Affinity of plant viral nanoparticle potato virus X (PVX) towards malignant B cells enables cancer drug delivery. Biomater Sci 2020; 8:3935-3943. [PMID: 32662788 DOI: 10.1039/d0bm00683a] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Non-Hodgkin's B cell lymphomas (NHL) include a diverse set of neoplasms that constitute ∼90% of all lymphomas and the largest subset of blood cancers. While chemotherapy is the first line of treatment, the efficacy of contemporary chemotherapies is hampered by dose-limiting toxicities. Partly due to suboptimal dosing, ∼40% of patients exhibit relapsed or refractory disease. Therefore more efficacious drug delivery systems are urgently needed to improve survival of NHL patients. In this study we demonstrate a new drug delivery platform for NHL based on the plant virus Potato virus X (PVX). We observed a binding affinity of PVX towards malignant B cells. In a metastatic mouse model of NHL, we show that systemically administered PVX home to tissues harboring malignant B cells. When loaded with the chemotherapy monomethyl auristatin (MMAE), the PVX nanocarrier enables effective delivery of MMAE to human B lymphoma cells in a NHL mouse model leading to inhibition of lymphoma growth in vivo and improved survival. Thus, PVX nanoparticle is a promising drug delivery platform for B cell malignancies.
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Affiliation(s)
- Sourabh Shukla
- Department of NanoEngineering, University of California San Diego, La Jolla, California 92093, USA.
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3
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Salinas-Jazmín N, González-González E, Vásquez-Bochm LX, Pérez-Tapia SM, Velasco-Velázquez MA. In Vitro Methods for Comparing Target Binding and CDC Induction Between Therapeutic Antibodies: Applications in Biosimilarity Analysis. J Vis Exp 2017. [PMID: 28518088 DOI: 10.3791/55542] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Therapeutic monoclonal antibodies (mAbs) are relevant to the treatment of different pathologies, including cancers. The development of biosimilar mAbs by pharmaceutical companies is a market opportunity, but it is also a strategy to increase drug accessibility and reduce therapy-associated costs. The protocols detailed here describe the evaluation of target binding and CDC induction by rituximab in Daudi cells. These two functions require different structural regions of the antibody and are relevant to the clinical effect induced by rituximab. The protocols allow the side-to-side comparison of a reference rituximab and a marketed rituximab biosimilar. The evaluated products showed differences both in target binding and CDC induction, suggesting that there are underlying physicochemical differences and highlighting the need to analyze the impact of those differences in the clinical setting. The methods reported here constitute simple and inexpensive in vitro models for the evaluation of the activity of rituximab biosimilars. Thus, they can be useful during biosimilar development, as well as for quality control in biosimilar production. Furthermore, the presented methods can be extrapolated to other therapeutic mAbs.
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Affiliation(s)
- Nohemi Salinas-Jazmín
- Unit for Development and Research in Bioprocesses Unit (UDIBI), National School of Biological Sciences, National Polytechnic Institute (IPN), University of Mexico (UNAM); School of Chemistry, National Autonomous University of Mexico (UNAM)
| | - Edith González-González
- Unit for Development and Research in Bioprocesses Unit (UDIBI), National School of Biological Sciences, National Polytechnic Institute (IPN), University of Mexico (UNAM)
| | - Luz X Vásquez-Bochm
- Graduate Program in Chemical Sciences, National Autonomous University of Mexico (UNAM)
| | - Sonia M Pérez-Tapia
- Unit for Development Research and Medical Innovation in Biotechnology (UDIMEB), National School of Biological Sciences, National Polytechnic Institute (IPN); Department of Immunology, National Scool of Biological Sciences, National Polytechnic Institute (IPN)
| | - Marco A Velasco-Velázquez
- Department of Pharmacology and Unit of Translational Biomedicine (CMN 20 de noviembre), School of Medicine, National Autonomous University of Mexico (UNAM);
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4
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Coyne CP, Narayanan L. Gemcitabine-(5'-phosphoramidate)-[anti-IGF-1R]: molecular design, synthetic organic chemistry reactions, and antineoplastic cytotoxic potency in populations of pulmonary adenocarcinoma (A549). Chem Biol Drug Des 2017; 89:379-399. [PMID: 27561602 PMCID: PMC5396302 DOI: 10.1111/cbdd.12845] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2016] [Revised: 08/12/2016] [Accepted: 08/19/2016] [Indexed: 02/06/2023]
Abstract
One molecular-based approach that increases potency and reduces dose-limited sequela is the implementation of selective 'targeted' delivery strategies for conventional small molecular weight chemotherapeutic agents. Descriptions of the molecular design and organic chemistry reactions that are applicable for synthesis of covalent gemcitabine-monophosphate immunochemotherapeutics have to date not been reported. The covalent immunopharmaceutical, gemcitabine-(5'-phosphoramidate)-[anti-IGF-1R] was synthesized by reacting gemcitabine with a carbodiimide reagent to form a gemcitabine carbodiimide phosphate ester intermediate which was subsequently reacted with imidazole to create amine-reactive gemcitabine-(5'-phosphorylimidazolide) intermediate. Monoclonal anti-IGF-1R immunoglobulin was combined with gemcitabine-(5'-phosphorylimidazolide) resulting in the synthetic formation of gemcitabine-(5'-phosphoramidate)-[anti-IGF-1R]. The gemcitabine molar incorporation index for gemcitabine-(5'-phosphoramidate)-[anti-IGF-R1] was 2.67:1. Cytotoxicity Analysis - dramatic increases in antineoplastic cytotoxicity were observed at and between the gemcitabine-equivalent concentrations of 10-9 M and 10-7 M where lethal cancer cell death increased from 0.0% to a 93.1% maximum (100.% to 6.93% residual survival), respectively. Advantages of the organic chemistry reactions in the multistage synthesis scheme for gemcitabine-(5'-phosphoramidate)-[anti-IGF-1R] include their capacity to achieve high chemotherapeutic molar incorporation ratios; option of producing an amine-reactive chemotherapeutic intermediate that can be preserved for future synthesis applications; and non-dedicated organic chemistry reaction scheme that allows substitutions of either or both therapeutic moieties, and molecular delivery platforms.
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Affiliation(s)
- Cody P. Coyne
- Department of Basic SciencesCollege of Veterinary MedicineWise CenterMississippi State UniversityMississippi StateMSUSA
- College of Veterinary MedicineWise CenterMississippi State UniversityMississippi StateMSUSA
| | - Lakshmi Narayanan
- Department of Basic SciencesCollege of Veterinary MedicineWise CenterMississippi State UniversityMississippi StateMSUSA
- College of Veterinary MedicineWise CenterMississippi State UniversityMississippi StateMSUSA
- Present address: Fishery and Wildlife Research CenterMississippi State UniversityLocksley Way 201Mississippi StateMSUSA
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5
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Holgate RGE, Weldon R, Jones TD, Baker MP. Characterisation of a Novel Anti-CD52 Antibody with Improved Efficacy and Reduced Immunogenicity. PLoS One 2015; 10:e0138123. [PMID: 26372145 PMCID: PMC4570798 DOI: 10.1371/journal.pone.0138123] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2015] [Accepted: 08/25/2015] [Indexed: 02/02/2023] Open
Abstract
Anti-CD52 therapy has been shown to be effective in the treatment of a number of B cell malignancies, hematopoietic disorders and autoimmune diseases (including rheumatoid arthritis and multiple sclerosis); however the current standard of treatment, the humanized monoclonal antibody alemtuzumab, is associated with the development of anti-drug antibodies in a high proportion of patients. In order to address this problem, we have identified a novel murine anti-CD52 antibody which has been humanized using a process that avoids the inclusion within the variable domains of non-human germline MHC class II binding peptides and known CD4+ T cell epitopes, thus reducing its potential for immunogenicity in the clinic. The resultant humanized antibody, ANT1034, was shown to have superior binding to CD52 expressing cells than alemtuzumab and was more effective at directing both antibody dependent and complement dependent cell cytotoxicity. Furthermore, when in the presence of a cross-linking antibody, ANT1034 was more effective at directly inducing apoptosis than alemtuzumab. ANT1034 also showed superior activity in a SCID mouse/human CD52 tumour xenograft model where a single 1 mg/Kg dose of ANT1034 led to increased mouse survival compared to a 10 mg/Kg dose of alemtuzumab. Finally, ANT1034 was compared to alemtuzumab in in vitro T cell assays in order to evaluate its potential to stimulate proliferation of T cells in peripheral blood mononuclear cells derived from a panel of human donors: whereas alemtuzumab stimulated proliferation in a high proportion of the donor cohort, ANT1034 did not stimulate proliferation in any of the donors. Therefore we have developed a candidate therapeutic humanized antibody, ANT1034, that may have the potential to be more efficacious and less immunogenic than the current standard anti-CD52 therapy.
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Affiliation(s)
| | - Richard Weldon
- Antitope Limited, Babraham Research Campus, Cambridge, United Kingdom
| | - Timothy D. Jones
- Antitope Limited, Babraham Research Campus, Cambridge, United Kingdom
| | - Matthew P. Baker
- Antitope Limited, Babraham Research Campus, Cambridge, United Kingdom
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6
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Köberle M, Müller K, Kamprad M, Horn F, Scholz M. Monitoring Disease Progression and Therapeutic Response in a Disseminated Tumor Model for Non-Hodgkin Lymphoma by Bioluminescence Imaging. Mol Imaging 2015. [DOI: 10.2310/7290.2015.00010] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
Affiliation(s)
- Margarethe Köberle
- From the Translational Centre for Regenerative Medicine, Institute of Clinical Immunology, Institute of Pathology, Faculty of Veterinary Medicine, Institute for Clinical Immunology, Institute for Medical Informatics, Statistics and Epidemiology, and LIFE Research Center for Civilization Diseases, University of Leipzig, and Fraunhofer Institute for Cell Therapy and Immunology, Leipzig, Germany
| | - Kristin Müller
- From the Translational Centre for Regenerative Medicine, Institute of Clinical Immunology, Institute of Pathology, Faculty of Veterinary Medicine, Institute for Clinical Immunology, Institute for Medical Informatics, Statistics and Epidemiology, and LIFE Research Center for Civilization Diseases, University of Leipzig, and Fraunhofer Institute for Cell Therapy and Immunology, Leipzig, Germany
| | - Manja Kamprad
- From the Translational Centre for Regenerative Medicine, Institute of Clinical Immunology, Institute of Pathology, Faculty of Veterinary Medicine, Institute for Clinical Immunology, Institute for Medical Informatics, Statistics and Epidemiology, and LIFE Research Center for Civilization Diseases, University of Leipzig, and Fraunhofer Institute for Cell Therapy and Immunology, Leipzig, Germany
| | - Friedemann Horn
- From the Translational Centre for Regenerative Medicine, Institute of Clinical Immunology, Institute of Pathology, Faculty of Veterinary Medicine, Institute for Clinical Immunology, Institute for Medical Informatics, Statistics and Epidemiology, and LIFE Research Center for Civilization Diseases, University of Leipzig, and Fraunhofer Institute for Cell Therapy and Immunology, Leipzig, Germany
| | - Markus Scholz
- From the Translational Centre for Regenerative Medicine, Institute of Clinical Immunology, Institute of Pathology, Faculty of Veterinary Medicine, Institute for Clinical Immunology, Institute for Medical Informatics, Statistics and Epidemiology, and LIFE Research Center for Civilization Diseases, University of Leipzig, and Fraunhofer Institute for Cell Therapy and Immunology, Leipzig, Germany
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7
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Marie-Cardine A, Viaud N, Thonnart N, Joly R, Chanteux S, Gauthier L, Bonnafous C, Rossi B, Bléry M, Paturel C, Bensussan A, Bagot M, Sicard H. IPH4102, a humanized KIR3DL2 antibody with potent activity against cutaneous T-cell lymphoma. Cancer Res 2015; 74:6060-70. [PMID: 25361998 DOI: 10.1158/0008-5472.can-14-1456] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Advanced cutaneous T-cell lymphoma (CTCL) remains an unmet medical need, which lacks effective targeted therapies. In this study, we report the development of IPH4102, a humanized monoclonal antibody that targets the immune receptor KIR3DL2, which is widely expressed on CTCL cells but few normal immune cells. Potent antitumor properties of IPH4102 were documented in allogeneic human CTCL cells and a mouse model of KIR3DL2(+) disease. IPH4102 antitumor activity was mediated by antibody-dependent cell cytotoxicity and phagocytosis. IPH4102 improved survival and reduced tumor growth in mice inoculated with KIR3DL2(+) tumors. Ex vivo efficacy was further evaluated in primary Sézary patient cells, sorted natural killer-based autologous assays, and direct spiking into Sézary patient peripheral blood mononuclear cells. In these settings, IPH4102 selectively and efficiently killed primary Sézary cells, including at unfavorable effector-to-target ratios characteristic of unsorted PBMC. Together, our results offer preclinical proof of concept for the clinical development of IPH4102 to treat patients with advanced CTCL.
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MESH Headings
- Animals
- Antibodies, Monoclonal, Humanized/administration & dosage
- Antibody-Dependent Cell Cytotoxicity/immunology
- Cell Line, Tumor
- Humans
- Lymphoma, T-Cell, Cutaneous/drug therapy
- Lymphoma, T-Cell, Cutaneous/immunology
- Lymphoma, T-Cell, Cutaneous/pathology
- Mice
- Neoplasm Staging
- Receptors, KIR3DL2/biosynthesis
- Receptors, KIR3DL2/immunology
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Affiliation(s)
- Anne Marie-Cardine
- INSERM U976, Hôpital Saint Louis, Paris, France. University Paris Diderot, Sorbonne Paris Cité, UMRS 976, Paris, France.
| | | | - Nicolas Thonnart
- INSERM U976, Hôpital Saint Louis, Paris, France. University Paris Diderot, Sorbonne Paris Cité, UMRS 976, Paris, France
| | | | | | | | | | | | | | | | - Armand Bensussan
- INSERM U976, Hôpital Saint Louis, Paris, France. University Paris Diderot, Sorbonne Paris Cité, UMRS 976, Paris, France
| | - Martine Bagot
- INSERM U976, Hôpital Saint Louis, Paris, France. University Paris Diderot, Sorbonne Paris Cité, UMRS 976, Paris, France. AP-HP, Hôpital Saint Louis, Department of Dermatology, Paris, France
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8
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Jin S, Li S, Wang C, Liu J, Yang X, Wang PC, Zhang X, Liang XJ. Biosafe nanoscale pharmaceutical adjuvant materials. J Biomed Nanotechnol 2014; 10:2393-419. [PMID: 25429253 PMCID: PMC4242152 DOI: 10.1166/jbn.2014.1898] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Thanks to developments in the field of nanotechnology over the past decades, more and more biosafe nanoscale materials have become available for use as pharmaceutical adjuvants in medical research. Nanomaterials possess unique properties which could be employed to develop drug carriers with longer circulation time, higher loading capacity, better stability in physiological conditions, controlled drug release, and targeted drug delivery. In this review article, we will review recent progress in the application of representative organic, inorganic and hybrid biosafe nanoscale materials in pharmaceutical research, especially focusing on nanomaterial-based novel drug delivery systems. In addition, we briefly discuss the advantages and notable functions that make these nanomaterials suitable for the design of new medicines; the biosafety of each material discussed in this article is also highlighted to provide a comprehensive understanding of their adjuvant attributes.
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Affiliation(s)
- Shubin Jin
- CAS Key Laboratory for Biological Effects of Nanomaterials and Nanosafety, National Center for Nanoscience and Technology, Beijing 100190, P. R. China
| | - Shengliang Li
- CAS Key Laboratory for Biological Effects of Nanomaterials and Nanosafety, National Center for Nanoscience and Technology, Beijing 100190, P. R. China
- Department of Neurobiology and Anatomy, Zhongshan School of Medicine, Sun Yat-Sen University, Guangzhou 510275, P. R. China
| | - Chongxi Wang
- CAS Key Laboratory for Biological Effects of Nanomaterials and Nanosafety, National Center for Nanoscience and Technology, Beijing 100190, P. R. China
| | - Juan Liu
- CAS Key Laboratory for Biological Effects of Nanomaterials and Nanosafety, National Center for Nanoscience and Technology, Beijing 100190, P. R. China
| | - Xiaolong Yang
- CAS Key Laboratory for Biological Effects of Nanomaterials and Nanosafety, National Center for Nanoscience and Technology, Beijing 100190, P. R. China
| | - Paul C. Wang
- Laboratory of Molecular Imaging, Department of Radiology, Howard University, Washington DC 20060, USA
| | - Xin Zhang
- National Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, P. R. China
| | - Xing-Jie Liang
- CAS Key Laboratory for Biological Effects of Nanomaterials and Nanosafety, National Center for Nanoscience and Technology, Beijing 100190, P. R. China
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9
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Weiskopf K, Ring AM, Ho CCM, Volkmer JP, Levin AM, Volkmer AK, Özkan E, Fernhoff NB, van de Rijn M, Weissman IL, Garcia KC. Engineered SIRPα variants as immunotherapeutic adjuvants to anticancer antibodies. Science 2013; 341:88-91. [PMID: 23722425 PMCID: PMC3810306 DOI: 10.1126/science.1238856] [Citation(s) in RCA: 372] [Impact Index Per Article: 33.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
CD47 is an antiphagocytic signal that cancer cells employ to inhibit macrophage-mediated destruction. Here, we modified the binding domain of human SIRPα, the receptor for CD47, for use as a CD47 antagonist. We engineered high-affinity SIRPα variants with about a 50,000-fold increased affinity for human CD47 relative to wild-type SIRPα. As high-affinity SIRPα monomers, they potently antagonized CD47 on cancer cells but did not induce macrophage phagocytosis on their own. Instead, they exhibited remarkable synergy with all tumor-specific monoclonal antibodies tested by increasing phagocytosis in vitro and enhancing antitumor responses in vivo. This "one-two punch" directs immune responses against tumor cells while lowering the threshold for macrophage activation, thereby providing a universal method for augmenting the efficacy of therapeutic anticancer antibodies.
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MESH Headings
- Adjuvants, Immunologic
- Animals
- Antibodies, Monoclonal/therapeutic use
- Antibodies, Monoclonal, Murine-Derived/therapeutic use
- Antibodies, Neoplasm/therapeutic use
- Antigens, Differentiation/chemistry
- Antigens, Differentiation/genetics
- Antigens, Differentiation/therapeutic use
- CD47 Antigen/immunology
- Cell Line, Tumor
- Directed Molecular Evolution
- Humans
- Immunotherapy
- Macrophage Activation
- Mice
- Neoplasms/immunology
- Neoplasms/therapy
- Phagocytosis
- Receptors, Immunologic/chemistry
- Receptors, Immunologic/genetics
- Receptors, Immunologic/therapeutic use
- Rituximab
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Affiliation(s)
- Kipp Weiskopf
- Institute for Stem Cell Biology and Regenerative Medicine, and the Ludwig Center for Cancer Stem Cell Research and Medicine, Stanford University School of Medicine, Stanford, California 94305, USA
- Stanford Cancer Institute, Stanford University School of Medicine, Stanford, California 94305, USA
| | - Aaron M. Ring
- Institute for Stem Cell Biology and Regenerative Medicine, and the Ludwig Center for Cancer Stem Cell Research and Medicine, Stanford University School of Medicine, Stanford, California 94305, USA
- Stanford Cancer Institute, Stanford University School of Medicine, Stanford, California 94305, USA
- Department of Molecular and Cellular Physiology, and Department of Structural Biology, Stanford University School of Medicine, Stanford, California 94305, USA
- Howard Hughes Medical Institute, Stanford University School of Medicine, Stanford, California 94305, USA
| | - Chia Chi M. Ho
- Institute for Stem Cell Biology and Regenerative Medicine, and the Ludwig Center for Cancer Stem Cell Research and Medicine, Stanford University School of Medicine, Stanford, California 94305, USA
- Stanford Cancer Institute, Stanford University School of Medicine, Stanford, California 94305, USA
- Department of Molecular and Cellular Physiology, and Department of Structural Biology, Stanford University School of Medicine, Stanford, California 94305, USA
- Howard Hughes Medical Institute, Stanford University School of Medicine, Stanford, California 94305, USA
| | - Jens-Peter Volkmer
- Institute for Stem Cell Biology and Regenerative Medicine, and the Ludwig Center for Cancer Stem Cell Research and Medicine, Stanford University School of Medicine, Stanford, California 94305, USA
- Stanford Cancer Institute, Stanford University School of Medicine, Stanford, California 94305, USA
| | - Aron M. Levin
- Department of Molecular and Cellular Physiology, and Department of Structural Biology, Stanford University School of Medicine, Stanford, California 94305, USA
- Howard Hughes Medical Institute, Stanford University School of Medicine, Stanford, California 94305, USA
| | - Anne Kathrin Volkmer
- Institute for Stem Cell Biology and Regenerative Medicine, and the Ludwig Center for Cancer Stem Cell Research and Medicine, Stanford University School of Medicine, Stanford, California 94305, USA
- Stanford Cancer Institute, Stanford University School of Medicine, Stanford, California 94305, USA
- Department of Obstetrics and Gynaecology, University of Dusseldorf, Germany
| | - Engin Özkan
- Department of Molecular and Cellular Physiology, and Department of Structural Biology, Stanford University School of Medicine, Stanford, California 94305, USA
- Howard Hughes Medical Institute, Stanford University School of Medicine, Stanford, California 94305, USA
| | - Nathaniel B. Fernhoff
- Institute for Stem Cell Biology and Regenerative Medicine, and the Ludwig Center for Cancer Stem Cell Research and Medicine, Stanford University School of Medicine, Stanford, California 94305, USA
- Stanford Cancer Institute, Stanford University School of Medicine, Stanford, California 94305, USA
| | - Matt van de Rijn
- Department of Pathology, Stanford University Medical Center, Stanford, California 94305, USA
| | - Irving L. Weissman
- Institute for Stem Cell Biology and Regenerative Medicine, and the Ludwig Center for Cancer Stem Cell Research and Medicine, Stanford University School of Medicine, Stanford, California 94305, USA
- Stanford Cancer Institute, Stanford University School of Medicine, Stanford, California 94305, USA
- Department of Pathology, Stanford University Medical Center, Stanford, California 94305, USA
| | - K. Christopher Garcia
- Department of Molecular and Cellular Physiology, and Department of Structural Biology, Stanford University School of Medicine, Stanford, California 94305, USA
- Howard Hughes Medical Institute, Stanford University School of Medicine, Stanford, California 94305, USA
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10
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Yu B, Mao Y, Yuan Y, Yue C, Wang X, Mo X, Jarjoura D, Paulaitis ME, Lee RJ, Byrd JC, Lee LJ, Muthusamy N. Targeted drug delivery and cross-linking induced apoptosis with anti-CD37 based dual-ligand immunoliposomes in B chronic lymphocytic leukemia cells. Biomaterials 2013; 34:6185-93. [PMID: 23726226 DOI: 10.1016/j.biomaterials.2013.04.063] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2013] [Accepted: 04/30/2013] [Indexed: 12/15/2022]
Abstract
Despite advances in chemo and immunotherapeutic agents for B chronic lymphocytic leukemia (B-CLL), the undesirable adverse side effects due to non-specific cellular uptake remain to be addressed. We identified anti-CD37 monoclonal antibody immunoliposomes (ILs) as vehicles for targeted delivery to B chronic lymphocytic leukemia cells. To achieve maximal benefits for all patients, a new strategy of dual-ligand immunoliposomes (dILs) was developed. A combinatorial antibody microarray technology was adapted to quickly identify optimal antibody combinations for individual patient cells. For proof-of-concept, a B-cell specific antibody, either anti-CD19 or anti-CD20, was combined with anti-CD37 to construct dILs with enhanced selectivity and efficacy. Consistent with data from the antibody microarray, these dILs provided highly specific targeting to both leukemia cell lines and B-CLL patient cells. Compared with the single antibody ILs, the anti-CD19/CD37 dILs clearly demonstrated superior delivery efficiency and apoptosis induction to B-CLL patient cells, whereas the anti-CD20/anti-CD37 dILs were found to be the most efficient for delivery to leukemia cell lines. In addition, it was observed that anti-CD37 ILs without payload drug mediated effective CD37 cross-linking and induced potent apoptosis induction. The anti-CD19/CD20 dILs showed the improved cell apoptosis induction compared to either anti-CD19 ILs or anti-CD20 ILs. Our findings suggest that the dual-ligand ILs may provide a preferred strategy of personalized nanomedicine for the treatment of B-cell malignancies.
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Affiliation(s)
- Bo Yu
- Department of Chemical and Biomolecular Engineering, The Ohio State University, Columbus, OH, USA
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11
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Baskar S, Muthusamy N. Antibody-based therapeutics for the treatment of human B cell malignancies. Curr Allergy Asthma Rep 2013; 13:33-43. [PMID: 23229130 PMCID: PMC3674564 DOI: 10.1007/s11882-012-0327-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
The dynamic expression of various phenotypic markers during B cell development not only defines the particular stage in ontogeny but also provides the necessary growth, differentiation, maturation and survival signals. When a B cell at any given stage becomes cancerous, these cell surface molecules, intracellular signaling molecules, and the over-expressed gene products become favorite targets for potential therapeutic intervention. Various adaptive and adoptive immunotherapeutic approaches induce T cell and antibody responses against cancer cells, and successful remission leading to minimal residual disease has been obtained. Nonetheless, subsequent relapse and development of resistant clones prompted further development and several novel strategies are evolving. Engineered monoclonal antibodies with high affinity and specificity to target antigens have been developed and used either alone or in combination with chemotherapeutic drugs. They are also used as vehicles to deliver cytotoxic drugs, toxins, or radionuclides that are either directly conjugated or encapsulated in liposomal vesicles. Likewise, genetically engineered T cells bearing chimeric antigen receptors are used to redirect cytotoxicity to antigen-positive target cells. This review describes recent advancements in some of these adoptive immunotherapeutic strategies targeting B cell malignancies.
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Affiliation(s)
- Sivasubramanian Baskar
- Experimental Transplantation and Immunology Branch, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Building 10/CRC; Room 3E-3248, Bethesda, MD 20892, USA
| | - Natarajan Muthusamy
- Division of Hematology, Department of Internal Medicine; Molecular Virology, Immunology and Medical Genetics and Veterinary BioSciences, The OSU Comprehensive Cancer Center, The Ohio State University, 455E, OSUCCC, 410, West 12th Avenue, Columbus, OH 43210, USA
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12
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Mao Y, Triantafillou G, Hertlein E, Towns W, Stefanovski M, Mo X, Jarjoura D, Phelps M, Marcucci G, Lee LJ, Goldenberg DM, Lee RJ, Byrd JC, Muthusamy N. Milatuzumab-conjugated liposomes as targeted dexamethasone carriers for therapeutic delivery in CD74+ B-cell malignancies. Clin Cancer Res 2013; 19:347-56. [PMID: 23209030 PMCID: PMC3793126 DOI: 10.1158/1078-0432.ccr-12-2046] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
PURPOSE Corticosteroids are widely used for the treatment of B-cell malignancies, including non-Hodgkin lymphoma, chronic lymphocytic leukemia (CLL), and acute lymphoblastic leukemia; however, this class of drug is associated with undesirable off-target effects. Herein, we developed novel milatuzumab-conjugated liposomes as a targeted dexamethasone carrier for therapeutic delivery in CD74(+) B-cell malignancies and explored its effect against the disease. EXPERIMENTAL DESIGN The targeting efficiency of milatuzumab-targeted liposomes to CD74(+) cells was evaluated in vitro. The effect of CD74-targeted liposomal dexamethasone was compared with free dexamethasone in primary CLL cells and cell lines in vitro. The therapeutic efficacy of CD74-targeted liposomal dexamethasone was evaluated in a Raji-severe combined immunodeficient (SCID) xenograft model in vivo. RESULTS Milatuzumab-targeted liposomes promoted selective incorporation of carrier molecules into transformed CD74-positive B cells as compared with CD74-negative T-cells. The CD74-dexamethasone-targeted liposomes (CD74-IL-DEX) promoted and increased killing in CD74-positive tumor cells and primary CLL cells. Furthermore, the targeted drug liposomes showed enhanced therapeutic efficacy against a CD74-positive B-cell model as compared with free, or non-targeted, liposomal dexamethasone in SCID mice engrafted with Raji cells in vivo. CONCLUSIONS These studies provide evidence and support for a potential use of CD74-targeted liposomal dexamethasone as a new therapy for B-cell malignancies.
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MESH Headings
- Animals
- Antibodies, Monoclonal, Humanized/administration & dosage
- Antibodies, Monoclonal, Humanized/pharmacology
- Antigens, Differentiation, B-Lymphocyte/metabolism
- Cell Line, Tumor
- Dexamethasone/administration & dosage
- Dexamethasone/pharmacology
- Disease Models, Animal
- Female
- Histocompatibility Antigens Class II/metabolism
- Humans
- Leukemia, B-Cell/drug therapy
- Leukemia, B-Cell/metabolism
- Leukemia, B-Cell/mortality
- Liposomes
- Lymphoma, B-Cell/drug therapy
- Lymphoma, B-Cell/metabolism
- Lymphoma, B-Cell/mortality
- Mice
- Tumor Burden/drug effects
- Xenograft Model Antitumor Assays
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Affiliation(s)
- Yicheng Mao
- Division of Hematology, The Comprehensive Cancer Center, The Ohio State University, Columbus, Ohio
- Division of Pharmaceutics, The Ohio State University, Columbus, Ohio
| | - Georgia Triantafillou
- Division of Hematology, The Comprehensive Cancer Center, The Ohio State University, Columbus, Ohio
| | - Erin Hertlein
- Division of Hematology, The Comprehensive Cancer Center, The Ohio State University, Columbus, Ohio
| | - William Towns
- Division of Hematology, The Comprehensive Cancer Center, The Ohio State University, Columbus, Ohio
| | - Matthew Stefanovski
- Division of Hematology, The Comprehensive Cancer Center, The Ohio State University, Columbus, Ohio
| | - Xiaokui Mo
- Center for Biostatistics, The Ohio State University, Columbus, Ohio
| | - David Jarjoura
- Center for Biostatistics, The Ohio State University, Columbus, Ohio
| | - Mitch Phelps
- Division of Pharmaceutics, The Ohio State University, Columbus, Ohio
| | - Guido Marcucci
- Division of Hematology, The Comprehensive Cancer Center, The Ohio State University, Columbus, Ohio
| | - Ly James Lee
- Department of Chemical and Biomolecular Engineering, The Ohio State University, Columbus, Ohio
| | - David M. Goldenberg
- Garden State Cancer Center, Center for Molecular Medicine and Immunology, Morris Plains, New Jersey
| | - Robert J. Lee
- Division of Pharmaceutics, The Ohio State University, Columbus, Ohio
| | - John C. Byrd
- Division of Hematology, The Comprehensive Cancer Center, The Ohio State University, Columbus, Ohio
- Medicinal Chemistry, College of Pharmacy, The Ohio State University, Columbus, Ohio
| | - Natarajan Muthusamy
- Division of Hematology, The Comprehensive Cancer Center, The Ohio State University, Columbus, Ohio
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13
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Beyer I, Cao H, Persson J, Wang H, Liu Y, Yumul R, Li Z, Woodle D, Manger R, Gough M, Rocha D, Bogue J, Baldessari A, Berenson R, Carter D, Lieber A. Transient removal of CD46 is safe and increases B-cell depletion by rituximab in CD46 transgenic mice and macaques. Mol Ther 2012; 21:291-9. [PMID: 23089733 DOI: 10.1038/mt.2012.212] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
We have developed a technology that depletes the complement regulatory protein (CRP) CD46 from the cell surface, and thereby sensitizes tumor cells to complement-dependent cytotoxicity triggered by therapeutic monoclonal antibodies (mAbs). This technology is based on a small recombinant protein, Ad35K++, which induces the internalization and subsequent degradation of CD46. In preliminary studies, we had demonstrated the utility of the combination of Ad35K++ and several commercially available mAbs such as rituximab, alemtuzumab, and trastuzumab in enhancing cell killing in vitro as well as in vivo in murine xenograft and syngeneic tumor models. We have completed scaled manufacturing of Ad35K++ protein in Escherichia coli for studies in nonhuman primates (NHPs). In macaques, we first defined a dose of the CD20-targeting mAb rituximab that did not deplete CD20-positive peripheral blood cells. Using this dose of rituximab, we then demonstrated that pretreatment with Ad35K++ reconstituted near complete elimination of B cells. Further studies demonstrated that the treatment was well tolerated and safe. These findings in a relevant large animal model provide the rationale for moving this therapy forward into clinical trials in patients with CD20-positive B-cell malignancies.
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Affiliation(s)
- Ines Beyer
- Department of Medicine, Division of Medical Genetics, University of Washington, Seattle, Washington 98195, USA
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14
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Engineered human Tmpk fused with truncated cell-surface markers: versatile cell-fate control safety cassettes. Gene Ther 2012; 20:24-34. [PMID: 22241175 DOI: 10.1038/gt.2011.210] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Cell-fate control gene therapy (CFCGT)-based strategies can augment existing gene therapy and cell transplantation approaches by providing a safety element in the event of deleterious outcomes. Previously, we described a novel enzyme/prodrug combination for CFCGT. Here, we present results employing novel lentiviral constructs harboring sequences for truncated surface molecules (CD19 or low-affinity nerve growth factor receptor) directly fused to that CFCGT cDNA (TmpkF105Y). This confers an enforced one-to-one correlation between cell marking and eradication functions. In-vitro analysis demonstrated the full functionality of the fusion product. Next, low-dose 3'-azido-3'-deoxythymidine (AZT) administration to non-obese diabetic/severe combined immunodeficiency (NOD/SCID) mice injected with transduced clonal K562 cells suppressed tumor growth; furthermore, one integrated vector on average was sufficient to mediate cytotoxicity. Further, in a murine xenogeneic leukemia-lymphoma model we also demonstrated in-vivo control over transduced Raji cells. Finally, in a proof-of-principle study to examine the utility of this cassette in combination with a therapeutic cDNA, we integrated this novel CFCGT fusion construct into a lentivector designed for treatment of Fabry disease. Transduction with this vector restored enzyme activity in Fabry cells and retained AZT sensitivity. In addition, human Fabry patient CD34(+) cells showed high transduction efficiencies and retained normal colony-generating capacity when compared with the non-transduced controls. These collective results demonstrated that this novel and broadly applicable fusion system may enhance general safety in gene- and cell-based therapies.
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15
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Abstract
The MYC transcription factor is a master regulator of diverse cellular functions and has been long considered a compelling therapeutic target because of its role in a range of human malignancies. However, pharmacologic inhibition of MYC function has proven challenging because of both the diverse mechanisms driving its aberrant expression and the challenge of disrupting protein-DNA interactions. Here, we demonstrate the rapid and potent abrogation of MYC gene transcription by representative small molecule inhibitors of the BET family of chromatin adaptors. MYC transcriptional suppression was observed in the context of the natural, chromosomally translocated, and amplified gene locus. Inhibition of BET bromodomain-promoter interactions and subsequent reduction of MYC transcript and protein levels resulted in G(1) arrest and extensive apoptosis in a variety of leukemia and lymphoma cell lines. Exogenous expression of MYC from an artificial promoter that is resistant to BET regulation significantly protected cells from cell cycle arrest and growth suppression by BET inhibitors. MYC suppression was accompanied by deregulation of the MYC transcriptome, including potent reactivation of the p21 tumor suppressor. Treatment with a BET inhibitor resulted in significant antitumor activity in xenograft models of Burkitt's lymphoma and acute myeloid leukemia. These findings demonstrate that pharmacologic inhibition of MYC is achievable through targeting BET bromodomains. Such inhibitors may have clinical utility given the widespread pathogenetic role of MYC in cancer.
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16
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Hu Y, Gale M, Shields J, Garron C, Swistak M, Nguyen TH, Jacques G, Fogle R, Siders W, Kaplan J. Enhancement of the anti-tumor activity of therapeutic monoclonal antibodies by CXCR4 antagonists. Leuk Lymphoma 2011; 53:130-8. [PMID: 21740294 DOI: 10.3109/10428194.2011.601698] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
The interaction between CXCR4 on the surface of tumor cells and CXCL12 in the stroma is believed to contribute to tumor cell survival and protection against drug treatment. Inhibition of stromal survival signals by CXCR4 antagonists has been reported to render tumor cells more sensitive to chemotherapy, but little is known about potential synergy with monoclonal antibodies. In this study, administration of the small molecule CXCR4 antagonists plerixafor and GENZ-644494 was found to enhance the anti-tumor activity of the monoclonal antibodies alemtuzumab and rituximab in disseminated lymphoma models. The observed enhancement in therapeutic efficacy by CXCR4 antagonists appeared to involve several factors, including interference with the tumor-promoting signals delivered by CXCL12, disruption of the tumor/stroma interaction and mobilization of effector neutrophils capable of mediating antibody-dependent cell-mediated cytotoxicity. The involvement of neutrophils was further supported by the observed reversal in therapeutic benefit upon neutrophil depletion.
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Affiliation(s)
- Yanping Hu
- Genzyme Corporation, Framingham, MA 01701, USA
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17
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Sézary syndrome: Immunopathogenesis, literature review of therapeutic options, and recommendations for therapy by the United States Cutaneous Lymphoma Consortium (USCLC). J Am Acad Dermatol 2011; 64:352-404. [DOI: 10.1016/j.jaad.2010.08.037] [Citation(s) in RCA: 129] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2010] [Revised: 08/10/2010] [Accepted: 08/30/2010] [Indexed: 11/19/2022]
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18
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Siders WM, Shields J, Garron C, Hu Y, Boutin P, Shankara S, Weber W, Roberts B, Kaplan JM. Involvement of neutrophils and natural killer cells in the anti-tumor activity of alemtuzumab in xenograft tumor models. Leuk Lymphoma 2010; 51:1293-304. [PMID: 20377308 DOI: 10.3109/10428191003777963] [Citation(s) in RCA: 63] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Alemtuzumab is a recombinant humanized IgG1 monoclonal antibody directed against CD52, an antigen expressed on the surface of normal and malignant B and T lymphocytes. Alemtuzumab is approved for the treatment of B-cell chronic lymphocytic leukemia (B-CLL), but the exact mechanism by which the antibody depletes malignant lymphocytes in vivo is not clearly defined. To address this issue, the anti-tumor activity of alemtuzumab was studied in disseminated and subcutaneous xenograft tumor models. The density of CD52 target antigen on the surface of tumor cells appeared to correlate with the anti-tumor activity of alemtuzumab. Deglycosylation of alemtuzumab resulted in a loss of cytotoxicity in vitro and was found to abolish anti-tumor activity in vivo. Individual inactivation of effector mechanisms in tumor-bearing mice indicated that the protective activity of alemtuzumab in vivo was primarily dependent on ADCC mediated by neutrophils and to a lesser extent NK cells. Increasing the number of circulating neutrophils by treatment with G-CSF enhanced the anti-tumor activity of the antibody, thus providing further evidence for the involvement of neutrophils as effector cells in the activity of alemtuzumab.
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19
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Jin Y, Liu S, Yu B, Golan S, Koh CG, Yang J, Huynh L, Yang X, Pang J, Muthusamy N, Chan KK, Byrd JC, Talmon Y, Lee LJ, Lee RJ, Marcucci G. Targeted delivery of antisense oligodeoxynucleotide by transferrin conjugated pH-sensitive lipopolyplex nanoparticles: a novel oligonucleotide-based therapeutic strategy in acute myeloid leukemia. Mol Pharm 2010; 7:196-206. [PMID: 19852511 DOI: 10.1021/mp900205r] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Therapeutic use of oligodeoxynucleotides (ODNs) that hybridize to and downregulate target mRNAs encoding proteins that contribute to malignant transformation has a sound rationale, but has had an overall limited clinical success in cancer due to insufficient intracellular delivery. Here we report a development of formulations capable of promoting targeted delivery and enhanced pharmacologic activity of ODNs in acute myeloid leukemia (AML) cell lines and patient primary cells. In this study, transferrin (Tf) conjugated pH-sensitive lipopolyplex nanoparticles (LPs) were prepared to deliver GTI-2040, an antisense ODN against the R2 subunit of ribonucleotide reductase that has been shown to contribute to chemoresistance in AML. LPs had an average particle size around 110 nm and a moderately positive zeta potential at approximately 10 mV. The ODN encapsulation efficiency of LPs was >90%. These nanoparticles could release ODNs at acidic endosomal pH and facilitate the cytoplasmic delivery of ODNs after endocytosis. In addition, Tf-mediated targeted delivery of GTI-2040 was achieved. R2 downregulation at both mRNA and protein levels was improved by 8-fold in Kasumi-1 cells and 2- to 20-fold in AML patient primary cells treated with GTI-2040-Tf-LPs, compared to free GTI-2040 treatment. Moreover, Tf-LPs were more effective than nontargeted LPs, with 10 to 100% improvement at various concentrations in Kasumi-1 cells and an average of 45% improvement at 3 microM concentration in AML patient primary cells. Treatment with 1 microM GTI-2040-Tf-LPs sensitized AML cells to the chemotherapy agent cytarabine, by decreasing its IC(50) value from 47.69 nM to 9.05 nM. This study suggests that the combination of pH sensitive LP formulation and Tf mediated targeting is a promising strategy for antisense ODN delivery in leukemia therapy.
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Affiliation(s)
- Yan Jin
- NSF Nanoscale Science and Engineering Center, Division of Pharmaceutics, College of Pharmacy, Department of Chemical and Biomolecular Engineering, The Comprehensive Cancer Center, and Division of Hematology and Oncology, Department of Internal Medicine, The Ohio State University, Columbus, Ohio, USA
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20
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Huang M, Itahana K, Zhang Y, Mitchell BS. Depletion of guanine nucleotides leads to the Mdm2-dependent proteasomal degradation of nucleostemin. Cancer Res 2009; 69:3004-12. [PMID: 19318567 PMCID: PMC4568828 DOI: 10.1158/0008-5472.can-08-3413] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Nucleostemin is a positive regulator of cell proliferation and is highly expressed in a variety of stem cells, tumors, and tumor cell lines. The protein shuttles between the nucleolus and the nucleus in a GTP-dependent fashion. Selective depletion of intracellular guanine nucleotides by AVN-944, an inhibitor of the de novo purine synthetic enzyme, IMP dehydrogenase, leads to the rapid disappearance of nucleostemin protein in tumor cell lines, an effect that does not occur with two other nucleolar proteins, nucleophosmin or nucleolin. Endogenous nucleostemin protein is completely stabilized by MG132, an inhibitor of the 26S proteasome, as are the levels of expressed enhanced green fluorescent protein-tagged nucleostemin, both wild-type protein and protein containing mutations at the G(1) GTP binding site. Nutlin-3a, a small molecule that disrupts the binding of the E3 ubiquitin ligase, Mdm2, to p53, stabilizes nucleostemin protein in the face of guanine nucleotide depletion, as does siRNA-mediated knockdown of Mdm2 expression and overexpression of a dominant-negative form of Mdm2. Neither Doxorubicin nor Actinomycin D, which cause the release of nucleostemin from the nucleolus, results in nucleostemin degradation. We conclude that nucleostemin is a target for Mdm2-mediated ubiquitination and degradation when not bound to GTP. Because this effect does not occur with other chemotherapeutic agents, the induction of nucleostemin protein degradation in tumor cells by IMP dehydrogenase inhibition or by other small molecules that disrupt GTP binding may offer a new approach to the treatment of certain neoplastic diseases.
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Affiliation(s)
- Min Huang
- Department of Medicine, Divisions of Oncology and Hematology, and the Stanford Cancer Center, Stanford University, Palo Alto, California
| | - Koji Itahana
- Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
| | - Yanping Zhang
- Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
| | - Beverly S. Mitchell
- Department of Medicine, Divisions of Oncology and Hematology, and the Stanford Cancer Center, Stanford University, Palo Alto, California
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