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Duhalde Vega M, Olivera D, Gastão Davanzo G, Bertullo M, Noya V, Fabiano de Souza G, Primon Muraro S, Castro I, Arévalo AP, Crispo M, Galliussi G, Russo S, Charbonnier D, Rammauro F, Jeldres M, Alamón C, Varela V, Batthyany C, Bollati-Fogolín M, Oppezzo P, Pritsch O, Proença-Módena JL, Nakaya HI, Trias E, Barbeito L, Anegon I, Cuturi MC, Moraes-Vieira P, Segovia M, Hill M. PD-1/PD-L1 blockade abrogates a dysfunctional innate-adaptive immune axis in critical β-coronavirus disease. Sci Adv 2022; 8:eabn6545. [PMID: 36129987 PMCID: PMC9491709 DOI: 10.1126/sciadv.abn6545] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
Severe COVID-19 is associated with hyperinflammation and weak T cell responses against SARS-CoV-2. However, the links between those processes remain partially characterized. Moreover, whether and how therapeutically manipulating T cells may benefit patients are unknown. Our genetic and pharmacological evidence demonstrates that the ion channel TMEM176B inhibited inflammasome activation triggered by SARS-CoV-2 and SARS-CoV-2-related murine β-coronavirus. Tmem176b-/- mice infected with murine β-coronavirus developed inflammasome-dependent T cell dysfunction and critical disease, which was controlled by modulating dysfunctional T cells with PD-1 blockers. In critical COVID-19, inflammasome activation correlated with dysfunctional T cells and low monocytic TMEM176B expression, whereas PD-L1 blockade rescued T cell functionality. Here, we mechanistically link T cell dysfunction and inflammation, supporting a cancer immunotherapy to reinforce T cell immunity in critical β-coronavirus disease.
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Affiliation(s)
- Maite Duhalde Vega
- Laboratory of Immunoregulation and Inflammation, Institut Pasteur de Montevideo, 11400 Montevideo, Uruguay
| | - Daniela Olivera
- Laboratory of Immunoregulation and Inflammation, Institut Pasteur de Montevideo, 11400 Montevideo, Uruguay
- Immunobiology Department, Faculty of Medicine, University of the Republic, 11800 Montevideo, Uruguay
| | - Gustavo Gastão Davanzo
- Laboratory of Immunometabolism, Department of Genetics, Evolution, Microbiology and Immunology, Institute of Biology, University of Campinas, SP, Brazil
| | | | - Verónica Noya
- Laboratory of Molecular Biology, Sanatorio Americano, 11600 Montevideo, Uruguay
| | - Gabriela Fabiano de Souza
- Laboratory of Emerging Viruses, Department of Genetics, Evolution, Microbiology and Immunology, Institute of Biology, University of Campinas, SP, Brazil
| | - Stéfanie Primon Muraro
- Laboratory of Emerging Viruses, Department of Genetics, Evolution, Microbiology and Immunology, Institute of Biology, University of Campinas, SP, Brazil
| | | | - Ana Paula Arévalo
- Laboratory Animals Biotechnology, Institut Pasteur de Montevideo, 11400 Montevideo, Uruguay
| | - Martina Crispo
- Laboratory Animals Biotechnology, Institut Pasteur de Montevideo, 11400 Montevideo, Uruguay
| | - Germán Galliussi
- Laboratory of Vascular Biology and Drug Development, Institut Pasteur de Montevideo, 11400 Montevideo, Uruguay
| | - Sofía Russo
- Laboratory of Immunoregulation and Inflammation, Institut Pasteur de Montevideo, 11400 Montevideo, Uruguay
- Immunobiology Department, Faculty of Medicine, University of the Republic, 11800 Montevideo, Uruguay
| | - David Charbonnier
- Laboratory of Immunoregulation and Inflammation, Institut Pasteur de Montevideo, 11400 Montevideo, Uruguay
| | - Florencia Rammauro
- Immunobiology Department, Faculty of Medicine, University of the Republic, 11800 Montevideo, Uruguay
- Laboratory of Immunovirology, Institut Pasteur de Montevideo, 11400 Montevideo, Uruguay
| | - Mathías Jeldres
- Laboratory of Immunoregulation and Inflammation, Institut Pasteur de Montevideo, 11400 Montevideo, Uruguay
- Immunobiology Department, Faculty of Medicine, University of the Republic, 11800 Montevideo, Uruguay
| | - Catalina Alamón
- Laboratorio de Neurodegeneración, Institut Pasteur de Montevideo, 11400 Montevideo, Uruguay
| | - Valentina Varela
- Laboratorio de Neurodegeneración, Institut Pasteur de Montevideo, 11400 Montevideo, Uruguay
| | - Carlos Batthyany
- Laboratory of Vascular Biology and Drug Development, Institut Pasteur de Montevideo, 11400 Montevideo, Uruguay
| | | | - Pablo Oppezzo
- Research Laboratory on Chronic Lymphocytic Leukemia, Institut Pasteur de Montevideo, 11400 Montevideo, Uruguay
| | - Otto Pritsch
- Immunobiology Department, Faculty of Medicine, University of the Republic, 11800 Montevideo, Uruguay
- Laboratory of Immunovirology, Institut Pasteur de Montevideo, 11400 Montevideo, Uruguay
| | - José Luiz Proença-Módena
- Laboratory of Emerging Viruses, Department of Genetics, Evolution, Microbiology and Immunology, Institute of Biology, University of Campinas, SP, Brazil
| | | | - Emiliano Trias
- Laboratorio de Neurodegeneración, Institut Pasteur de Montevideo, 11400 Montevideo, Uruguay
| | - Luis Barbeito
- Laboratorio de Neurodegeneración, Institut Pasteur de Montevideo, 11400 Montevideo, Uruguay
| | - Ignacio Anegon
- INSERM UMR 1064, Center for Research in Transplantation and Immunology; Université de Nantes; CHU Nantes, Institut de Transplantation Urologie Néphrologie (ITUN), 44093 Nantes, France
| | - María Cristina Cuturi
- INSERM UMR 1064, Center for Research in Transplantation and Immunology; Université de Nantes; CHU Nantes, Institut de Transplantation Urologie Néphrologie (ITUN), 44093 Nantes, France
| | - Pedro Moraes-Vieira
- Laboratory of Immunometabolism, Department of Genetics, Evolution, Microbiology and Immunology, Institute of Biology, University of Campinas, SP, Brazil
| | - Mercedes Segovia
- Laboratory of Immunoregulation and Inflammation, Institut Pasteur de Montevideo, 11400 Montevideo, Uruguay
- Immunobiology Department, Faculty of Medicine, University of the Republic, 11800 Montevideo, Uruguay
- Corresponding author. (M.S.); (M.H.)
| | - Marcelo Hill
- Laboratory of Immunoregulation and Inflammation, Institut Pasteur de Montevideo, 11400 Montevideo, Uruguay
- Immunobiology Department, Faculty of Medicine, University of the Republic, 11800 Montevideo, Uruguay
- Corresponding author. (M.S.); (M.H.)
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2
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Stanganelli C, Torres DC, Ortega C, Márquez ME, Remedi V, Cabrera J, Mardaraz C, Galvano C, Krzywinski A, Lang C, Zanella L, Agriello E, Bezares R, Pavlovsky A, Pavlovsky MA, Oppezzo P, Slavutsky I. Somatic hypermutation profiles in stereotyped IGHV4-34 receptors from South American chronic lymphocytic leukemia patients. Ann Hematol 2022; 101:341-348. [PMID: 34713310 DOI: 10.1007/s00277-021-04703-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2021] [Accepted: 10/18/2021] [Indexed: 11/28/2022]
Abstract
Chronic lymphocytic leukemia (CLL) is the most common mature B-cell neoplasm in the West. IGHV4-34 is one of the most frequently used genes in CLL patients, which usually display an indolent outcome. In this study, we explored the mutational profile of CLL patients expressing IGHV4-34 within different stereotypes and their association with prognostic factors and clinical outcome. A multi-institutional cohort of unselected 1444 CLL patients was analyzed by RT-PCR and bidirectional sequencing. Cytogenetics and molecular cytogenetics analyses were also performed. We identified 144 (10%) IGHV4-34 expressing cases, 119 mutated (M), 44 of them with stereotyped B-cell receptors. Subset #4 was the most frequent (56.8% of cases) followed by subsets #16 (13.6%), #29 (6.8%), and #201 (2.3%), with different distribution among countries. Analysis of somatic hypermutation profile showed significant differences among stereotyped subsets for G28>D/E, P45>S, E55>Q, and S64>I changes (p < 0.01) and high frequency of disruption of the glycosylation motif in the VH CDR2 region. All stereotyped IGHV4-34 cases showed normal karyotypes. Deletion 13q14 as a sole alteration was present in 42.8% of stereotyped cases with a different distribution among subsets. A shorter time to first treatment was found in non-stereotyped vs. stereotyped M-IGHV4-34 patients (p = 0.034). Our results add new information supporting the importance of recurrent amino acid changes at particular positions, contributing to refine the molecular characterization of South American CLL patients.
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Affiliation(s)
- Carmen Stanganelli
- División Patología Molecular, Instituto de Investigaciones Hematológicas, Academia Nacional de Medicina (ANM), Pacheco de Melo 3081, 1425, Buenos Aires, Argentina.
| | - Davi Coe Torres
- Instituto Nacional de Câncer, Río de Janeiro, RJ, Brazil
- Hospital Israelita Albert Einstein, São Paulo, SP, Brazil
| | - Claudia Ortega
- Chronic Lymphocytic Leukemia Laboratory, Institut Pasteur de Montevideo, Montevideo, Uruguay
| | - María Elena Márquez
- Chronic Lymphocytic Leukemia Laboratory, Institut Pasteur de Montevideo, Montevideo, Uruguay
- Instituto Venezolano de Investigaciones Científicas, Caracas, Venezuela
| | - Victoria Remedi
- Hospital Maciel, Administración Servicios de Salud del Estado, Ministerio de Salud, Montevideo, Uruguay
| | - Juana Cabrera
- División Patología Molecular, Instituto de Investigaciones Hematológicas, Academia Nacional de Medicina (ANM), Pacheco de Melo 3081, 1425, Buenos Aires, Argentina
| | | | - Camila Galvano
- Laboratorio de Genética de Neoplasias Linfoides, Instituto de Medicina Experimental, CONICET-ANM, Buenos Aires, Argentina
| | - Andrea Krzywinski
- Laboratorio de Genética de Neoplasias Linfoides, Instituto de Medicina Experimental, CONICET-ANM, Buenos Aires, Argentina
| | - Cecilia Lang
- Laboratorio de Especialidades Bioquímicas, Bahía Blanca, Argentina
| | - Lorena Zanella
- Laboratorio de Especialidades Bioquímicas, Bahía Blanca, Argentina
| | | | - Raimundo Bezares
- Hospital General de Agudos Teodoro Álvarez, Buenos Aires, Argentina
| | | | | | - Pablo Oppezzo
- Chronic Lymphocytic Leukemia Laboratory, Institut Pasteur de Montevideo, Montevideo, Uruguay
| | - Irma Slavutsky
- Laboratorio de Genética de Neoplasias Linfoides, Instituto de Medicina Experimental, CONICET-ANM, Buenos Aires, Argentina
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Abstract
Despite the importance of recombinant protein production in the academy and industrial fields, many issues concerning the expression of soluble and homogeneous products are still unsolved. Several strategies were developed to overcome these obstacles; however, at present, there is no magic bullet that can be applied for all cases. Indeed, several key expression parameters need to be evaluated for each protein. Among the different hosts for protein expression, Escherichia coli is by far the most widely used. In this chapter, we review many of the different tools employed to circumvent protein insolubility problems.
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Affiliation(s)
- Claudia Ortega
- Recombinant Protein Unit, Institut Pasteur de Montevideo, Montevideo, Uruguay
| | - Pablo Oppezzo
- Recombinant Protein Unit, Institut Pasteur de Montevideo, Montevideo, Uruguay
| | - Agustín Correa
- Recombinant Protein Unit, Institut Pasteur de Montevideo, Montevideo, Uruguay.
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Morande PE, Yan XJ, Sepulveda J, Seija N, Marquez ME, Sotelo N, Abreu C, Crispo M, Fernández-Graña G, Rego N, Bois T, Methot SP, Palacios F, Remedi V, Rai KR, Buschiazzo A, Di Noia JM, Navarrete MA, Chiorazzi N, Oppezzo P. AID overexpression leads to aggressive murine CLL and nonimmunoglobulin mutations that mirror human neoplasms. Blood 2021; 138:246-258. [PMID: 34292322 DOI: 10.1182/blood.2020008654] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2020] [Accepted: 02/12/2021] [Indexed: 11/20/2022] Open
Abstract
Most cancers become more dangerous by the outgrowth of malignant subclones with additional DNA mutations that favor proliferation or survival. Using chronic lymphocytic leukemia (CLL), a disease that exemplifies this process and is a model for neoplasms in general, we created transgenic mice overexpressing the enzyme activation-induced deaminase (AID), which has a normal function of inducing DNA mutations in B lymphocytes. AID not only allows normal B lymphocytes to develop more effective immunoglobulin-mediated immunity, but is also able to mutate nonimmunoglobulin genes, predisposing to cancer. In CLL, AID expression correlates with poor prognosis, suggesting a role for this enzyme in disease progression. Nevertheless, direct experimental evidence identifying the specific genes that are mutated by AID and indicating that those genes are associated with disease progression is not available. To address this point, we overexpressed Aicda in a murine model of CLL (Eμ-TCL1). Analyses of TCL1/AID mice demonstrate a role for AID in disease kinetics, CLL cell proliferation, and the development of cancer-related target mutations with canonical AID signatures in nonimmunoglobulin genes. Notably, our mouse models can accumulate mutations in the same genes that are mutated in human cancers. Moreover, some of these mutations occur at homologous positions, leading to identical or chemically similar amino acid substitutions as in human CLL and lymphoma. Together, these findings support a direct link between aberrant AID activity and CLL driver mutations that are then selected for their oncogenic effects, whereby AID promotes aggressiveness in CLL and other B-cell neoplasms.
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MESH Headings
- Animals
- Cytidine Deaminase/genetics
- Disease Models, Animal
- Gene Expression Regulation, Leukemic
- Humans
- Leukemia, Lymphocytic, Chronic, B-Cell/genetics
- Leukemia, Lymphocytic, Chronic, B-Cell/pathology
- Mice
- Mice, Inbred C57BL
- Mice, Transgenic
- Mutation
- Up-Regulation
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Affiliation(s)
- Pablo Elías Morande
- Research Laboratory on Chronic Lymphocytic Leukemia, Institut Pasteur de Montevideo, Montevideo, Uruguay
- Laboratorio de Inmunología Oncológica, Instituto de Medicina Experimental (IMEX-CONICET), Academia Nacional de Medicina de Buenos Aires, Buenos Aires, Argentina
- Tumor-Stroma Interactions, Department of Oncology, Luxembourg Institute of Health, Strassen, Luxembourg
| | - Xiao-Jie Yan
- The Karches Center for Oncology Research, The Feinstein Institutes for Medical Research, Manhasset, NY
| | - Julieta Sepulveda
- Laboratory of Molecular Medicine, Centro Asistencial Docente e Investigación de la Universidad de Magallanes (CADI-UMAG), School of Medicine, University of Magallanes, Punta Arenas, Chile
| | - Noé Seija
- Research Laboratory on Chronic Lymphocytic Leukemia, Institut Pasteur de Montevideo, Montevideo, Uruguay
| | - María Elena Marquez
- Research Laboratory on Chronic Lymphocytic Leukemia, Institut Pasteur de Montevideo, Montevideo, Uruguay
| | - Natalia Sotelo
- Research Laboratory on Chronic Lymphocytic Leukemia, Institut Pasteur de Montevideo, Montevideo, Uruguay
| | - Cecilia Abreu
- Research Laboratory on Chronic Lymphocytic Leukemia, Institut Pasteur de Montevideo, Montevideo, Uruguay
| | | | | | - Natalia Rego
- Bioinformatics Unit, Institut Pasteur de Montevideo, Montevideo, Uruguay
| | - Therence Bois
- Institut de Recherches Cliniques de Montreal, Montréal, QC, Canada
| | - Stephen P Methot
- Institut de Recherches Cliniques de Montreal, Montréal, QC, Canada
- Department of Medicine, Faculty of Medicine, Université de Montréal, Montréal, QC, Canada
| | - Florencia Palacios
- The Karches Center for Oncology Research, The Feinstein Institutes for Medical Research, Manhasset, NY
| | - Victoria Remedi
- Hospital Maciel, Administración de los Servicios de Salud del Estado (ASSE), Ministerio de Salud, Montevideo, Uruguay
| | - Kanti R Rai
- The Karches Center for Oncology Research, The Feinstein Institutes for Medical Research, Manhasset, NY
| | - Alejandro Buschiazzo
- Laboratory of Molecular and Structural Microbiology, Institut Pasteur de Montevideo, Montevideo, Uruguay; and
- Integrative Microbiology of Zoonotic Agents-International Joint Unit, Department of Microbiology, Institut Pasteur, Paris, France
| | - Javier M Di Noia
- Institut de Recherches Cliniques de Montreal, Montréal, QC, Canada
- Department of Medicine, Faculty of Medicine, Université de Montréal, Montréal, QC, Canada
| | - Marcelo A Navarrete
- Laboratory of Molecular Medicine, Centro Asistencial Docente e Investigación de la Universidad de Magallanes (CADI-UMAG), School of Medicine, University of Magallanes, Punta Arenas, Chile
| | - Nicholas Chiorazzi
- The Karches Center for Oncology Research, The Feinstein Institutes for Medical Research, Manhasset, NY
| | - Pablo Oppezzo
- Research Laboratory on Chronic Lymphocytic Leukemia, Institut Pasteur de Montevideo, Montevideo, Uruguay
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5
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Oppezzo P, Navarrete M, Chiorazzi N. AID in Chronic Lymphocytic Leukemia: Induction and Action During Disease Progression. Front Oncol 2021; 11:634383. [PMID: 34041018 PMCID: PMC8141630 DOI: 10.3389/fonc.2021.634383] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2020] [Accepted: 02/23/2021] [Indexed: 12/12/2022] Open
Abstract
The enzyme activation-induced cytidine deaminase (AID) initiates somatic hypermutation (SHM) and class switch recombination (CSR) of immunoglobulin (Ig) genes, critical actions for an effective adaptive immune response. However, in addition to the benefits generated by its physiological roles, AID is an etiological factor for the development of human and murine leukemias and lymphomas. This review highlights the pathological role of AID and the consequences of its actions on the development, progression, and therapeutic refractoriness of chronic lymphocytic leukemia (CLL) as a model disease for mature lymphoid malignancies. First, we summarize pertinent aspects of the expression and function of AID in normal B lymphocytes. Then, we assess putative causes for AID expression in leukemic cells emphasizing the role of an activated microenvironment. Thirdly, we discuss the role of AID in lymphomagenesis, in light of recent data obtained by NGS analyses on the genomic landscape of leukemia and lymphomas, concentrating on the frequency of AID signatures in these cancers and correlating previously described tumor-gene drivers with the presence of AID off-target mutations. Finally, we discuss how these changes could affect tumor suppressor and proto-oncogene targets and how they could be associated with disease progression. Collectively, we hope that these sections will help to better understand the complex paradox between the physiological role of AID in adaptive immunity and its potential causative activity in B-cell malignancies.
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Affiliation(s)
- Pablo Oppezzo
- Research Laboratory on Chronic Lymphocytic Leukemia, Institut Pasteur de Montevideo, Montevideo, Uruguay
| | | | - Nicholas Chiorazzi
- The Karches Center for Oncology Research, The Feinstein Institutes for Medical Research, New York, NY, United States
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Castro A, Berois N, Malanga A, Ortega C, Oppezzo P, Pristch O, Mombrú AW, Osinaga E, Pardo H. Docetaxel in chitosan-based nanocapsules conjugated with an anti-Tn antigen mouse/human chimeric antibody as a promising targeting strategy of lung tumors. Int J Biol Macromol 2021; 182:806-814. [PMID: 33857513 DOI: 10.1016/j.ijbiomac.2021.04.054] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2020] [Revised: 03/18/2021] [Accepted: 04/08/2021] [Indexed: 11/17/2022]
Abstract
The aim of this work was to evaluate the physicochemical and biological properties of docetaxel (DCX) loaded chitosan nanocapsules (CS Nc) functionalized with the monoclonal antibody Chi-Tn (CS-PEG-ChiTn mAb Nc) as a potential improvement treatment for cancer therapy. The Tn antigen is highly specific for carcinomas, and this is the first time that such structure is targeted for drug delivery. The nanocapsules (Ncs), formed as a polymeric shell around an oily core, allowed a 99.9% encapsulation efficiency of DCX with a monodispersity particle size in the range of 200 nm and a high positive surface charge that provide substantial stability to the nanosystems. Release profile of DCX from Ncs showed a sustained and pH dependent behavior with a faster release at acidic pH, which could be favorable in the intracellular drug delivery. We have designed PEGylated CS Nc modified with a monoclonal antibody which recognize Tn antigen, one of the most specific tumor associated antigen. A biotin-avidin approach achieved the successful attachment of the antibody to the nanocapsules. Uptake studies and viability assay conducted in A549 human lung cancer cell line in vitro demonstrate that ChiTn mAb enhance nanoparticles internalization and cell viability reduction. Consequently, these ChiTn functionalized nanocapsules are promising carriers for the active targeting of DCX to Tn expressing carcinomas.
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Affiliation(s)
- Analía Castro
- Centro NanoMat, DETEMA, Instituto Polo Tecnológico de Pando, Facultad de Química, Universidad de la República, Montevideo, Uruguay
| | - Nora Berois
- Laboratorio de Glicobiología e Inmunología Tumoral, Institut Pasteur de Montevideo, Montevideo, CP 11400, Uruguay
| | - Antonio Malanga
- Laboratorio de Biofarmacia y Tecnología Farmacéutica, Instituto Polo Tecnológico de Pando, Facultad de Química, Universidad de la República, Canelones, Uruguay
| | - Claudia Ortega
- Unidad de Proteínas Recombinantes, Institut Pasteur de Montevideo, Uruguay
| | - Pablo Oppezzo
- Unidad de Proteínas Recombinantes, Institut Pasteur de Montevideo, Uruguay
| | - Otto Pristch
- Departamento de Inmunobiología, Facultad de Medicina, Universidad de la República, Montevideo, Uruguay; Laboratorio de Inmuno-Virología, Institut Pasteur de Montevideo, Uruguay
| | - Alvaro W Mombrú
- Centro NanoMat, DETEMA, Instituto Polo Tecnológico de Pando, Facultad de Química, Universidad de la República, Montevideo, Uruguay
| | - Eduardo Osinaga
- Laboratorio de Glicobiología e Inmunología Tumoral, Institut Pasteur de Montevideo, Montevideo, CP 11400, Uruguay; Departamento de Inmunobiología, Facultad de Medicina, Universidad de la República, Montevideo, Uruguay
| | - Helena Pardo
- Centro NanoMat, DETEMA, Instituto Polo Tecnológico de Pando, Facultad de Química, Universidad de la República, Montevideo, Uruguay.
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7
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Risnik D, Colado A, Podaza E, Almejún MB, Elías EE, Bezares RF, Fernández-Grecco H, Seija N, Oppezzo P, Borge M, Gamberale R, Giordano M. Immunoregulatory effects of Lurbinectedin in chronic lymphocytic leukemia. Cancer Immunol Immunother 2020; 69:813-824. [PMID: 32055920 DOI: 10.1007/s00262-020-02513-y] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2019] [Accepted: 02/02/2020] [Indexed: 12/17/2022]
Abstract
Despite significant therapeutic improvements chronic lymphocytic leukemia (CLL) remains an incurable disease and there is a persistent pursuit of new treatment alternatives. Lurbinectedin, a selective inhibitor of active transcription of protein-coding genes, is currently in phase II/III clinical trials for solid tumors such as small-cell lung cancer (SCLC). In this study, we aimed to evaluate the activity of Lurbinectedin on circulating mononuclear cells from CLL patients and to determine whether Lurbinectedin could affect the cross-talk between B-CLL cells and the tumor microenvironment. We found that Lurbinectedin induced a dose- and time-dependent death in all cell types evaluated, with B cells, monocytes and monocytic myeloid derived suppressor cells (Mo-MDSC) being the most susceptible populations. At sub-apoptotic doses, Lurbinectedin decreased the expression of CCR7 in B-CLL cells and impaired their migration towards CCL19 and CCL21. Furthermore, low concentrations of Lurbinectedin stimulated the synthesis of pro-IL1β in monocytes and nurse-like cells, without inducing the inflammasome activation. Altogether, these results indicate that Lurbinectedin might have antitumor activity in CLL due to its direct action on leukemic cells in combination with its effects on the tumor microenvironment. Our findings encourage further investigation of Lurbinectedin as a potential therapy for CLL.
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Affiliation(s)
- Denise Risnik
- Laboratorio de Inmunología Oncológica, Instituto de Medicina Experimental (IMEX), CONICET-Academia Nacional de Medicina (ANM), Pacheco de Melo 3081, 1425, Buenos Aires, Argentina.
| | - Ana Colado
- Laboratorio de Inmunología Oncológica, Instituto de Medicina Experimental (IMEX), CONICET-Academia Nacional de Medicina (ANM), Pacheco de Melo 3081, 1425, Buenos Aires, Argentina
| | - Enrique Podaza
- Laboratorio de Inmunología Oncológica, Instituto de Medicina Experimental (IMEX), CONICET-Academia Nacional de Medicina (ANM), Pacheco de Melo 3081, 1425, Buenos Aires, Argentina
| | - María Belén Almejún
- Laboratorio de Inmunología Oncológica, Instituto de Medicina Experimental (IMEX), CONICET-Academia Nacional de Medicina (ANM), Pacheco de Melo 3081, 1425, Buenos Aires, Argentina
| | - Esteban Enrique Elías
- Laboratorio de Inmunología Oncológica, Instituto de Medicina Experimental (IMEX), CONICET-Academia Nacional de Medicina (ANM), Pacheco de Melo 3081, 1425, Buenos Aires, Argentina
| | | | | | - Noé Seija
- Laboratorio de Leucemia Linfocítica Crónica, Institut Pasteur Montevideo, Montevideo, Uruguay
| | - Pablo Oppezzo
- Laboratorio de Leucemia Linfocítica Crónica, Institut Pasteur Montevideo, Montevideo, Uruguay
| | - Mercedes Borge
- Laboratorio de Inmunología Oncológica, Instituto de Medicina Experimental (IMEX), CONICET-Academia Nacional de Medicina (ANM), Pacheco de Melo 3081, 1425, Buenos Aires, Argentina
| | - Romina Gamberale
- Laboratorio de Inmunología Oncológica, Instituto de Medicina Experimental (IMEX), CONICET-Academia Nacional de Medicina (ANM), Pacheco de Melo 3081, 1425, Buenos Aires, Argentina
| | - Mirta Giordano
- Laboratorio de Inmunología Oncológica, Instituto de Medicina Experimental (IMEX), CONICET-Academia Nacional de Medicina (ANM), Pacheco de Melo 3081, 1425, Buenos Aires, Argentina
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8
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Stanganelli C, Torres DC, Ortega C, Sotelo N, Márquez ME, Segges P, Muniz MTC, Bigni RS, Campregher PV, Sabino A, Gomes CP, Lopes Ferrari deChauffaille ML, Arrais Rodrigues C, Yamamoto M, Abdelhay E, Cabrera J, Deglesne PA, López JL, Galvano C, Krzywinski A, Bezares R, Lang C, Zanella L, Agriello E, Cabrejo M, Gabús R, Dighiero G, Oppezzo P, Hassan R, Slavutsky I. Distinctive IGHV gene usage and stereotyped receptors in South American patients with chronic lymphocytic leukemia. Hematol Oncol 2019; 37:644-648. [PMID: 31373034 DOI: 10.1002/hon.2661] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2019] [Revised: 07/24/2019] [Accepted: 07/26/2019] [Indexed: 11/08/2022]
Affiliation(s)
- Carmen Stanganelli
- División Patología Molecular, Instituto de Investigaciones Hematológicas, Academia Nacional de Medicina, Buenos Aires, Argentina
| | - Davi Coe Torres
- Laboratório de Oncovirologia, Centro de Transplante de Medula Óssea - CEMO, Instituto Nacional de Câncer - INCA, Rio de Janeiro, Brasil
| | | | | | - María Elena Márquez
- Centro de Medicina Experimental, Instituto Venezolano de Investigaciones Científicas, Caracas, Venezuela
| | - Priscilla Segges
- Laboratório de Oncovirologia, Centro de Transplante de Medula Óssea - CEMO, Instituto Nacional de Câncer - INCA, Rio de Janeiro, Brasil
| | - María Tereza C Muniz
- Laboratório de Biologia Molecular, Hospital Universitário Oswaldo Cruz, Instituto de Ciências Biológicas, Universidade de Pernambuco, Recife, Brazil
| | - Ricardo S Bigni
- Serviço de Hematologia, Instituto Nacional de Câncer - INCA, Rio de Janeiro, Brazil
| | - Paulo V Campregher
- Departamentos de Hematologia e Patologia Clínica, e Centro de Pesquisa Experimental, Hospital Israelita Albert Einstein, São Paulo, Brasil.,Departamento de Hematologia, Universidade Estadual de Campinas (Hemocentro-Unicamp), Campinas, Brasil
| | - Adriano Sabino
- Departamento de Análises Clínicas e Toxicológicas, Faculdade de Farmácia, Universidade Federal de Minas Gerais (UFMG), Belo Horizonte, Brazil
| | - Caio Perez Gomes
- Departamento de Biofísica, Universidade Federal de São Paulo (EPM-UNIFESP), São Paulo, Brazil
| | | | - Celso Arrais Rodrigues
- División de Hematologia, Universidade Federal de São Paulo (EPM-UNIFESP), São Paulo, Brazil
| | - Mihoko Yamamoto
- División de Hematologia, Universidade Federal de São Paulo (EPM-UNIFESP), São Paulo, Brazil
| | - Eliana Abdelhay
- Laboratório de Célula Tronco, Centro de Transplante de Medula Óssea - CEMO, Instituto Nacional de Câncer - INCA, Rio de Janeiro, Brazil
| | - Juana Cabrera
- División Patología Molecular, Instituto de Investigaciones Hematológicas, Academia Nacional de Medicina, Buenos Aires, Argentina
| | - Pierre-Antoine Deglesne
- Centro de Medicina Experimental, Instituto Venezolano de Investigaciones Científicas, Caracas, Venezuela
| | | | - Camila Galvano
- Laboratorio de Genética de Neoplasias Linfoides, Instituto de Medicina Experimental, CONICET-Academia Nacional de Medicina, Buenos Aires, Argentina
| | - Andrea Krzywinski
- Laboratorio de Genética de Neoplasias Linfoides, Instituto de Medicina Experimental, CONICET-Academia Nacional de Medicina, Buenos Aires, Argentina
| | | | - Cecilia Lang
- Laboratorio de Especialidades Bioquímicas (LEB), Bahía Blanca, Argentina
| | - Lorena Zanella
- Laboratorio de Especialidades Bioquímicas (LEB), Bahía Blanca, Argentina
| | | | | | | | | | - Pablo Oppezzo
- Instituto Pasteur de Montevideo, Montevideo, Uruguay
| | - Rocio Hassan
- Laboratório de Oncovirologia, Centro de Transplante de Medula Óssea - CEMO, Instituto Nacional de Câncer - INCA, Rio de Janeiro, Brasil
| | - Irma Slavutsky
- Laboratorio de Genética de Neoplasias Linfoides, Instituto de Medicina Experimental, CONICET-Academia Nacional de Medicina, Buenos Aires, Argentina
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9
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Morande PE, Sivina M, Uriepero A, Seija N, Berca C, Fresia P, Landoni AI, Di Noia JM, Burger JA, Oppezzo P. Ibrutinib therapy downregulates AID enzyme and proliferative fractions in chronic lymphocytic leukemia. Blood 2019; 133:2056-2068. [PMID: 30814061 PMCID: PMC7022232 DOI: 10.1182/blood-2018-09-876292] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2018] [Accepted: 02/21/2019] [Indexed: 12/16/2022] Open
Abstract
Activation-induced cytidine deaminase (AID) initiates somatic hypermutation and class switch recombination of the immunoglobulin genes. As a trade-off for its physiological function, AID also contributes to tumor development through its mutagenic activity. In chronic lymphocytic leukemia (CLL), AID is overexpressed in the proliferative fractions (PFs) of the malignant B lymphocytes, and its anomalous expression has been associated with a clinical poor outcome. Recent preclinical data suggested that ibrutinib and idelalisib, 2 clinically approved kinase inhibitors, increase AID expression and genomic instability in normal and neoplastic B cells. These results raise concerns about a potential mutagenic risk in patients receiving long-term therapy. To corroborate these findings in the clinical setting, we analyzed AID expression and PFs in a CLL cohort before and during ibrutinib treatment. We found that ibrutinib decreases the CLL PFs and, interestingly, also reduces AID expression, which correlates with dampened AKT and Janus Kinase 1 signaling. Moreover, although ibrutinib increases AID expression in a CLL cell line, it is unable to do so in primary CLL samples. Our results uncover a differential response to ibrutinib between cell lines and the CLL clone and imply that ibrutinib could differ from idelalisib in their potential to induce AID in treated patients. Possible reasons for the discrepancy between preclinical and clinical findings, and their effect on treatment safety, are discussed.
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Affiliation(s)
- Pablo Elías Morande
- Research Laboratory on Chronic Lymphocytic Leukemia, Institut Pasteur de Montevideo, Montevideo, Uruguay
| | - Mariela Sivina
- Department of Leukemia, The University of Texas MD Anderson Cancer Center, Houston, TX
| | - Angimar Uriepero
- Research Laboratory on Chronic Lymphocytic Leukemia, Institut Pasteur de Montevideo, Montevideo, Uruguay
| | - Noé Seija
- Research Laboratory on Chronic Lymphocytic Leukemia, Institut Pasteur de Montevideo, Montevideo, Uruguay
| | - Catalina Berca
- Research Laboratory on Chronic Lymphocytic Leukemia, Institut Pasteur de Montevideo, Montevideo, Uruguay
| | - Pablo Fresia
- Unidad de Bioinformática, Institut Pasteur de Montevideo, Montevideo, Uruguay
| | - Ana Inés Landoni
- Hospital Maciel, Administración de los Servicios de Salud del Estado, Ministerio de Salud, Montevideo, Uruguay
| | - Javier M Di Noia
- Division of Immunity and Viral Infections, Institut de Recherches Cliniques de Montréal, Montréal, QC, Canada; and
- Department of Medicine, Université de Montréal, Montréal, QC, Canada
| | - Jan A Burger
- Department of Leukemia, The University of Texas MD Anderson Cancer Center, Houston, TX
| | - Pablo Oppezzo
- Research Laboratory on Chronic Lymphocytic Leukemia, Institut Pasteur de Montevideo, Montevideo, Uruguay
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10
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Abstract
The advent of new DNA sequencing technologies leads to a dramatic increase in the number of available genome sequences and therefore of target genes with potential for functional analysis. The insertion of these sequences into proper expression vectors requires a simple an efficient cloning method. In addition, when expressing a target protein, quite often it is necessary to evaluate different DNA constructs to achieve a soluble and homogeneous expression of the target with satisfactory yields. The development of new molecular methods made possible the cloning of a huge number of DNA sequences in a high-throughput manner, necessary for meeting the increasing demands for soluble protein expression and characterization. In this chapter several molecular methods suitable for high-throughput cloning are reviewed.
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Affiliation(s)
- Claudia Ortega
- Recombinant Protein Unit, Institut Pasteur de Montevideo, Montevideo, Uruguay
- Research Laboratory on Chronic Lymphocytic Leukemia, Institut Pasteur de Montevideo, Montevideo, Uruguay
| | - Cecilia Abreu
- Recombinant Protein Unit, Institut Pasteur de Montevideo, Montevideo, Uruguay
- Molecular, Cellular and Animal Technology Program, Institut Pasteur de Montevideo, Montevideo, Uruguay
| | - Pablo Oppezzo
- Recombinant Protein Unit, Institut Pasteur de Montevideo, Montevideo, Uruguay
- Research Laboratory on Chronic Lymphocytic Leukemia, Institut Pasteur de Montevideo, Montevideo, Uruguay
| | - Agustín Correa
- Recombinant Protein Unit, Institut Pasteur de Montevideo, Montevideo, Uruguay.
- Research Laboratory on Chronic Lymphocytic Leukemia, Institut Pasteur de Montevideo, Montevideo, Uruguay.
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11
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Prieto D, Seija N, Uriepero A, Souto-Padron T, Oliver C, Irigoin V, Guillermo C, Navarrete MA, Inés Landoni A, Dighiero G, Gabus R, Giordano M, Oppezzo P. LPL protein in Chronic Lymphocytic Leukaemia have different origins in Mutated and Unmutated patients. Advances for a new prognostic marker in CLL. Br J Haematol 2018; 182:521-525. [PMID: 29953583 DOI: 10.1111/bjh.15427] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2018] [Revised: 04/17/2018] [Accepted: 04/18/2018] [Indexed: 01/15/2023]
Abstract
Lipoprotein lipase (LPL) mRNA expression in chronic lymphocytic leukaemia (CLL) is associated with an unmutated immunoglobulin profile and poor clinical outcome. We evaluated the subcellular localization of LPL protein in CLL cells that did or did not express LPL mRNA. Our results show that LPL protein is differently located in CLL cells depending on whether it is incorporated from the extracellular medium in mutated CLL or generated de novo by leukaemic cells of unmutated patients. The specific quantification of endogenous LPL protein correlates with mRNA expression levels and mutational IGHV status, suggesting LPL protein as a possible reliable prognostic marker in CLL.
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Affiliation(s)
- Daniel Prieto
- Chronic Lymphocytic Leukaemia Laboratory, Institut Pasteur de Montevideo, Montevideo, Uruguay.,Department of Developmental Neurobiology, Instituto de Investigaciones Biologicas Clemente Estable, Montevideo, Uruguay
| | - Noé Seija
- Chronic Lymphocytic Leukaemia Laboratory, Institut Pasteur de Montevideo, Montevideo, Uruguay.,Departamento de Inmunobiología, Facultad de Medicina, Universidad de la República, Montevideo, Uruguay
| | - Angimar Uriepero
- Chronic Lymphocytic Leukaemia Laboratory, Institut Pasteur de Montevideo, Montevideo, Uruguay
| | - Thais Souto-Padron
- Institute of Microbiology Paulo de Góes, Federal University of Rio de Janeiro, CCS, Rio de Janeiro, Brazil
| | - Carolina Oliver
- Cátedra de Hematología, Hospital de Clínicas, Universidad de la República, Montevideo, Uruguay
| | - Victoria Irigoin
- Cátedra de Hematología, Hospital de Clínicas, Universidad de la República, Montevideo, Uruguay
| | - Cecilia Guillermo
- Cátedra de Hematología, Hospital de Clínicas, Universidad de la República, Montevideo, Uruguay
| | | | - Ana Inés Landoni
- Hospital Maciel, Administración Servicios de Salud del Estado, Ministerio de Salud, Montevideo, Uruguay
| | - Guillermo Dighiero
- Hospital Maciel, Administración Servicios de Salud del Estado, Ministerio de Salud, Montevideo, Uruguay
| | - Raúl Gabus
- Hospital Maciel, Administración Servicios de Salud del Estado, Ministerio de Salud, Montevideo, Uruguay
| | - Mirta Giordano
- Laboratorio de Inmunología Oncológica, Instituto de Medicina Experimental, Academia Nacional de Medicina, Buenos Aires, Argentina
| | - Pablo Oppezzo
- Chronic Lymphocytic Leukaemia Laboratory, Institut Pasteur de Montevideo, Montevideo, Uruguay
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12
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Ortega C, Prieto D, Abreu C, Oppezzo P, Correa A. Multi-Compartment and Multi-Host Vector Suite for Recombinant Protein Expression and Purification. Front Microbiol 2018; 9:1384. [PMID: 29997597 PMCID: PMC6030378 DOI: 10.3389/fmicb.2018.01384] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2018] [Accepted: 06/06/2018] [Indexed: 11/13/2022] Open
Abstract
Recombinant protein expression has become an invaluable tool in basic and applied research. The accumulated knowledge in this field allowed the expression of thousands of protein targets in a soluble, pure, and homogeneous state, essential for biochemical and structural analyses. A lot of progress has been achieved in the last decades, where challenging proteins were expressed in a soluble manner after evaluating different parameters such as host, strain, and fusion partner or promoter strength, among others. In this regard, we have previously developed a vector suite that allows the evaluation of different promoters and solubility enhancer-proteins, through an easy and efficient cloning strategy. Nonetheless, the proper expression of many targets remains elusive, requiring, for example, the addition of complex post-translation modifications and/or passage through specialized compartments. In order to overcome the limitations found when working with a single subcellular localization and a single host type, we herein expanded our previously developed vector suite to include the evaluation of recombinant protein expression in different cell compartments and cell hosts. In addition, these vectors also allow the assessment of alternative purification strategies for the improvement of target protein yields.
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Affiliation(s)
- Claudia Ortega
- Recombinant Protein Unit, Institut Pasteur de Montevideo, Montevideo, Uruguay.,Research Laboratory on Chronic Lymphocytic Leukemia, Institut Pasteur de Montevideo, Montevideo, Uruguay
| | - Daniel Prieto
- Recombinant Protein Unit, Institut Pasteur de Montevideo, Montevideo, Uruguay.,Department of Developmental Neurobiology, Instituto de Investigaciones Biológicas Clemente Estable, Montevideo, Uruguay
| | - Cecilia Abreu
- Recombinant Protein Unit, Institut Pasteur de Montevideo, Montevideo, Uruguay.,Research Laboratory on Chronic Lymphocytic Leukemia, Institut Pasteur de Montevideo, Montevideo, Uruguay
| | - Pablo Oppezzo
- Recombinant Protein Unit, Institut Pasteur de Montevideo, Montevideo, Uruguay.,Research Laboratory on Chronic Lymphocytic Leukemia, Institut Pasteur de Montevideo, Montevideo, Uruguay
| | - Agustín Correa
- Recombinant Protein Unit, Institut Pasteur de Montevideo, Montevideo, Uruguay.,Research Laboratory on Chronic Lymphocytic Leukemia, Institut Pasteur de Montevideo, Montevideo, Uruguay
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13
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14
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Almejún MB, Borge M, Colado A, Elías EE, Podaza E, Risnik D, De Brasi CD, Stanganelli C, Slavutsky I, Cabrejo M, Fernández-Grecco H, Bezares RF, Cranco S, Burgos RÁ, Sánchez-Ávalos JC, Oppezzo P, Giordano M, Gamberale R. Sphingosine kinase 1 participates in the activation, proliferation and survival of chronic lymphocytic leukemia cells. Haematologica 2017; 102:e257-e260. [PMID: 28360148 DOI: 10.3324/haematol.2017.167353] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Affiliation(s)
- María Belén Almejún
- Laboratorio de Inmunología Oncológica, Instituto de Medicina Experimental (IMEX)-CONICET-Academia Nacional de Medicina (ANM), Buenos Aires, Argentina.,Departamento de Fisiología, Biología Molecular y Celular, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Argentina
| | - Mercedes Borge
- Laboratorio de Inmunología Oncológica, Instituto de Medicina Experimental (IMEX)-CONICET-Academia Nacional de Medicina (ANM), Buenos Aires, Argentina.,Departamento de Microbiología, Parasitología e Inmunología, Facultad de Medicina, Universidad de Buenos Aires, Argentina
| | - Ana Colado
- Laboratorio de Inmunología Oncológica, Instituto de Medicina Experimental (IMEX)-CONICET-Academia Nacional de Medicina (ANM), Buenos Aires, Argentina
| | - Esteban Enrique Elías
- Laboratorio de Inmunología Oncológica, Instituto de Medicina Experimental (IMEX)-CONICET-Academia Nacional de Medicina (ANM), Buenos Aires, Argentina
| | - Enrique Podaza
- Laboratorio de Inmunología Oncológica, Instituto de Medicina Experimental (IMEX)-CONICET-Academia Nacional de Medicina (ANM), Buenos Aires, Argentina
| | - Denise Risnik
- Laboratorio de Inmunología Oncológica, Instituto de Medicina Experimental (IMEX)-CONICET-Academia Nacional de Medicina (ANM), Buenos Aires, Argentina
| | - Carlos Daniel De Brasi
- Laboratorio de Genética Molecular de la Hemofilia, IMEX-CONICET-ANM, Buenos Aires, Argentina
| | - Carmen Stanganelli
- División Patología Molecular, Instituto de Investigaciones Hematológicas "Mariano R. Castex", Academia Nacional de Medicina, Buenos Aires, Argentina
| | - Irma Slavutsky
- Laboratorio de Genética de Neoplasias Linfoides, IMEX-CONICET-ANM, Buenos Aires, Argentina
| | - María Cabrejo
- Sanatorio Municipal Dr. Julio Méndez, Buenos Aires, Argentina
| | | | | | | | | | | | - Pablo Oppezzo
- Research Laboratory on Chronic Lymphocytic Leukemia, Institut Pasteur de Montevideo, Montevideo, Uruguay
| | - Mirta Giordano
- Laboratorio de Inmunología Oncológica, Instituto de Medicina Experimental (IMEX)-CONICET-Academia Nacional de Medicina (ANM), Buenos Aires, Argentina.,Departamento de Microbiología, Parasitología e Inmunología, Facultad de Medicina, Universidad de Buenos Aires, Argentina
| | - Romina Gamberale
- Laboratorio de Inmunología Oncológica, Instituto de Medicina Experimental (IMEX)-CONICET-Academia Nacional de Medicina (ANM), Buenos Aires, Argentina .,Departamento de Microbiología, Parasitología e Inmunología, Facultad de Medicina, Universidad de Buenos Aires, Argentina
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15
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Almejún MB, Campos BC, Patiño V, Galicchio M, Zelazko M, Oleastro M, Oppezzo P, Danielian S. Noninfectious complications in patients with pediatric-onset common variable immunodeficiency correlated with defects in somatic hypermutation but not in class-switch recombination. J Allergy Clin Immunol 2016; 139:913-922. [PMID: 27713077 DOI: 10.1016/j.jaci.2016.08.030] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2015] [Revised: 08/03/2016] [Accepted: 08/10/2016] [Indexed: 11/17/2022]
Abstract
BACKGROUND Common variable immunodeficiency (CVID) is a heterogeneous syndrome characterized by impaired immunoglobulin production and usually presents with a normal quantity of peripheral B cells. Most attempts aiming to classify these patients have mainly been focused on T- or B-cell phenotypes and their ability to produce protective antibodies, but it is still a major challenge to find a suitable classification that includes the clinical and immunologic heterogeneity of these patients. OBJECTIVE In this study we evaluated the late stages of B-cell differentiation in a heterogeneous population of patients with pediatric-onset CVID to clinically correlate and assess their ability to perform somatic hypermutation (SHM), class-switch recombination (CSR), or both. METHODS We performed a previously reported assay, the restriction enzyme hotspot mutation assay (IgκREHMA), to evaluate in vivo SHM status. We amplified switch regions from genomic DNA to investigate the quality of the double-strand break repairs in the class-switch recombination process in vivo. We also tested the ability to generate immunoglobulin germline and circle transcripts and to upregulate the activation-induced cytidine deaminase gene through in vitro T-dependent and T-independent stimuli. RESULTS Our results showed that patients could be classified into 2 groups according to their degree of SHM alteration. This stratification showed a significant association between patients of group A, severe alteration, and the presence of noninfectious complications. Additionally, 60% of patients presented with increased microhomology use at switched regions. In vitro activation revealed that patients with CVID behaved heterogeneously in terms of responsiveness to T-dependent stimuli. CONCLUSIONS The correlation between noninfectious complications and SHM could be an important tool for physicians to further characterize patients with CVID. This categorization would help to improve elucidation of the complex mechanisms involved in B-cell differentiation pathways.
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Affiliation(s)
- María Belén Almejún
- Servicio de Immunología y Reumatología, Hospital Nacional de Pediatría Prof. Dr Juan P. Garrahan, Buenos Aires, Argentina.
| | - Bárbara Carolina Campos
- Coordinación de Laboratorio, Hospital Nacional de Pediatría Prof. Dr Juan P. Garrahan, Buenos Aires, Argentina
| | - Virginia Patiño
- Unidad de Proteínas Recombinantes, Instituto Pasteur, Montevideo, Uruguay
| | - Miguel Galicchio
- Hospital de Niños Víctor J. Vilela, Rosario, Santa Fé, Argentina
| | - Marta Zelazko
- Servicio de Immunología y Reumatología, Hospital Nacional de Pediatría Prof. Dr Juan P. Garrahan, Buenos Aires, Argentina
| | - Matías Oleastro
- Servicio de Immunología y Reumatología, Hospital Nacional de Pediatría Prof. Dr Juan P. Garrahan, Buenos Aires, Argentina
| | - Pablo Oppezzo
- Unidad de Proteínas Recombinantes, Instituto Pasteur, Montevideo, Uruguay
| | - Silvia Danielian
- Servicio de Immunología y Reumatología, Hospital Nacional de Pediatría Prof. Dr Juan P. Garrahan, Buenos Aires, Argentina
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16
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Sedlik C, Heitzmann A, Viel S, Ait Sarkouh R, Batisse C, Schmidt F, De La Rochere P, Amzallag N, Osinaga E, Oppezzo P, Pritsch O, Sastre-Garau X, Hubert P, Amigorena S, Piaggio E. Effective antitumor therapy based on a novel antibody-drug conjugate targeting the Tn carbohydrate antigen. Oncoimmunology 2016; 5:e1171434. [PMID: 27622021 DOI: 10.1080/2162402x.2016.1171434] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2015] [Revised: 02/12/2016] [Accepted: 03/23/2016] [Indexed: 01/17/2023] Open
Abstract
Antibody-drug conjugates (ADC), combining the specificity of tumor recognition by monoclonal antibodies (mAb) and the powerful cytotoxicity of anticancer drugs, are currently under growing interest and development. Here, we studied the potential of Chi-Tn, a mAb directed to a glyco-peptidic tumor-associated antigen, to be used as an ADC for cancer treatment. First, we demonstrated that Chi-Tn specifically targeted tumor cells in vivo. Also, using flow cytometry and deconvolution microscopy, we showed that the Chi-Tn mAb is rapidly internalized - condition necessary to ensure the delivery of conjugated cytotoxic drugs in an active form, and targeted to early and recycling endosomes. When conjugated to saporin (SAP) or to auristatin F, the Chi-Tn ADC exhibited effective cytotoxicity to Tn-positive tumor cells in vitro, which correlated with the level of tumoral Tn expression. Furthermore, the Chi-Tn mAb conjugated to auristatin F also exhibited efficient antitumor activity in vivo, validating for the first time the use of an anti-Tn antibody as an effective ADC.
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Affiliation(s)
- Christine Sedlik
- Institut Curie, PSL Research University, Paris, France; INSERM U932, Paris, France; Centre d'Investigation Clinique Biothérapie CICBT 1428, Institut Curie, Paris, France
| | - Adèle Heitzmann
- Institut Curie, PSL Research University, Paris, France; INSERM U932, Paris, France; Centre d'Investigation Clinique Biothérapie CICBT 1428, Institut Curie, Paris, France
| | - Sophie Viel
- Institut Curie, PSL Research University, Paris, France; INSERM U932, Paris, France
| | - Rafik Ait Sarkouh
- Institut Curie, PSL Research University, Paris, France; CNRS UMR3666/INSERM U 1143, Paris, France
| | - Cornélie Batisse
- Institut Curie, PSL Research University, Paris, France; CNRS UMR3666/INSERM U 1143, Paris, France
| | - Frédéric Schmidt
- Institut Curie, PSL Research University, Paris, France; CNRS UMR3666/INSERM U 1143, Paris, France
| | | | - Nathalie Amzallag
- Institut Curie, PSL Research University, Paris, France; INSERM U932, Paris, France; Centre d'Investigation Clinique Biothérapie CICBT 1428, Institut Curie, Paris, France
| | - Eduardo Osinaga
- Departamento de Inmunobiología, Facultad de Medicina, Universidad de la República, Montevideo, Uruguay; Institut Pasteur de Montevideo, Montevideo, Uruguay
| | - Pablo Oppezzo
- Departamento de Inmunobiología, Facultad de Medicina, Universidad de la República, Montevideo, Uruguay; Institut Pasteur de Montevideo, Montevideo, Uruguay
| | - Otto Pritsch
- Departamento de Inmunobiología, Facultad de Medicina, Universidad de la República, Montevideo, Uruguay; Institut Pasteur de Montevideo, Montevideo, Uruguay
| | | | - Pascale Hubert
- Institut Curie, PSL Research University, Paris, France; INSERM U932, Paris, France; Centre d'Investigation Clinique Biothérapie CICBT 1428, Institut Curie, Paris, France
| | - Sebastian Amigorena
- Institut Curie, PSL Research University, Paris, France; INSERM U932, Paris, France; Centre d'Investigation Clinique Biothérapie CICBT 1428, Institut Curie, Paris, France
| | - Eliane Piaggio
- Institut Curie, PSL Research University, Paris, France; INSERM U932, Paris, France; Centre d'Investigation Clinique Biothérapie CICBT 1428, Institut Curie, Paris, France
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17
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Montamat-Sicotte D, Liztler LC, Abreu C, Safavi S, Zahn A, Orthwein A, Muschen M, Oppezzo P, Muñoz DP, Di Noia JM. HSP90 inhibitors decrease AID levels and activity in mice and in human cells. Eur J Immunol 2015; 45:2365-76. [PMID: 25912253 PMCID: PMC4536124 DOI: 10.1002/eji.201545462] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2015] [Revised: 03/26/2015] [Accepted: 04/25/2015] [Indexed: 01/25/2023]
Abstract
Activation induced deaminase (AID) initiates somatic hypermutation and class switch recombination of the Ig genes in antigen-activated B cells, underpinning antibody affinity maturation and isotype switching. AID can also be pathogenic by contributing to autoimmune diseases and oncogenic mutations. Moreover, AID can exert noncanonical functions when aberrantly expressed in epithelial cells. The lack of specific inhibitors prevents therapeutic applications to modulate AID functions. Here, we have exploited our previous finding that the HSP90 molecular chaperoning pathway stabilizes AID in B cells, to test whether HSP90 inhibitors could target AID in vivo. We demonstrate that chronic administration of HSP90 inhibitors decreases AID protein levels and isotype switching in immunized mice. HSP90 inhibitors also reduce disease severity in a mouse model of acute B-cell lymphoblastic leukemia in which AID accelerates disease progression. We further show that human AID protein levels are sensitive to HSP90 inhibition in normal and leukemic B cells, and that HSP90 inhibition prevents AID-dependent epithelial to mesenchymal transition in a human breast cancer cell line in vitro. Thus, we provide proof-of-concept that HSP90 inhibitors indirectly target AID in vivo and that endogenous human AID is widely sensitive to them, which could have therapeutic applications.
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Affiliation(s)
| | - Ludivine C Liztler
- Institut de Recherches Cliniques de Montréal, Montréal, Canada
- Department of Biochemistry, Université de Montréal, Montréal, QC, Canada
| | - Cecilia Abreu
- Research Laboratory on Chronic Lymphocytic Leukemia, Instituto Pasteur de Montevideo, Montevideo, Uruguay
| | - Shiva Safavi
- Institut de Recherches Cliniques de Montréal, Montréal, Canada
- Department of Medicine, McGill University, Montréal, QC, Canada
| | - Astrid Zahn
- Institut de Recherches Cliniques de Montréal, Montréal, Canada
| | | | - Markus Muschen
- UCSF Helen Diller Family Comprehensive Cancer Center, San Francisco,USA
| | - Pablo Oppezzo
- Research Laboratory on Chronic Lymphocytic Leukemia, Instituto Pasteur de Montevideo, Montevideo, Uruguay
| | - Denise P Muñoz
- UCSF Benioff Children’s Hospital and Research Institute at Oakland, Oakland, USA
| | - Javier M Di Noia
- Institut de Recherches Cliniques de Montréal, Montréal, Canada
- Department of Biochemistry, Université de Montréal, Montréal, QC, Canada
- Department of Medicine, McGill University, Montréal, QC, Canada
- Department of Medicine, Université de Montréal, Montréal, Canada
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18
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Palacios F, Prieto D, Abreu C, Ruiz S, Morande P, Fernández-Calero T, Libisch G, Landoni AI, Oppezzo P. Dissecting chronic lymphocytic leukemia microenvironment signals in patients with unmutated disease: microRNA-22 regulates phosphatase and tensin homolog/AKT/FOXO1 pathway in proliferative leukemic cells. Leuk Lymphoma 2015; 56:1560-5. [PMID: 25430416 DOI: 10.3109/10428194.2014.990900] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Chronic lymphocytic leukemia (CLL) is characterized by the accumulation of clonal B cells arrested in G0/G1 stages that coexist with proliferative B cells. We identified one of these proliferative subsets in the peripheral blood from patients with unmutated disease (UM). Aiming to characterize the molecular mechanism underlying this proliferative behavior, we performed gene expression analysis of the mRNA and microRNAs in this leukemic subpopulation and compared results with those for the quiescent counterpart. Our results suggest that proliferation of this subset mainly depends on microRNA-22 overexpression, which induces phosphatase and tensin homolog (PTEN) down-regulation and phosphoinositide 3-kinase (PI3K)/AKT pathway activation. These results underline the role of the PI3K/AKT pathway at the origin of this proliferative pool in patients with UM CLL and provide additional rationale for the use of PI3K inhibitors.
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Morande PE, Borge M, Abreu C, Galletti J, Zanetti SR, Nannini P, Bezares RF, Pantano S, Dighiero G, Oppezzo P, Gamberale R, Giordano M. Surface localization of high-mobility group nucleosome-binding protein 2 on leukemic B cells from patients with chronic lymphocytic leukemia is related to secondary autoimmune hemolytic anemia. Leuk Lymphoma 2015; 56:1115-22. [DOI: 10.3109/10428194.2014.957205] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Borge M, Remes Lenicov F, Nannini PR, de los Ríos Alicandú MM, Podaza E, Ceballos A, Fernández Grecco H, Cabrejo M, Bezares RF, Morande PE, Oppezzo P, Giordano M, Gamberale R. The Expression of Sphingosine-1 Phosphate Receptor-1 in Chronic Lymphocytic Leukemia Cells Is Impaired by Tumor Microenvironmental Signals and Enhanced by Piceatannol and R406. J I 2014; 193:3165-74. [DOI: 10.4049/jimmunol.1400547] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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Fischer S, Echeverría N, Moratorio G, Landoni AI, Dighiero G, Cristina J, Oppezzo P, Moreno P. Human endogenous retrovirus np9 gene is over expressed in chronic lymphocytic leukemia patients. Leuk Res Rep 2014; 3:70-2. [PMID: 25180156 PMCID: PMC4145164 DOI: 10.1016/j.lrr.2014.06.005] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2014] [Revised: 06/06/2014] [Accepted: 06/24/2014] [Indexed: 12/23/2022] Open
Abstract
The human genome contains a large number of endogenous retroviruses (HERVs). Their reactivation has frequently been observed in patients with cancer. Considering their role in the carcinogenesis process, we aimed to study the possible relationship between HERVs gene expression and Chronic Lymphocytic Leukemia (CLL). We focused on two viral genes gag and np9, the latter presumably an oncogene. We found that the transcriptional activity of HERV-K np9 gene was greater in CLL patients than in healthy donors. However, gag expression was not significantly increased. These findings suggest a noteworthy relationship between CLL disease and HERV-K np9 expression. We study the possible relationship between HERVs gene expression and CLL. CLL patients express np9 gene at least 5 times higher than in healthy donors. The gag gene expression was not significantly increased in CLL samples. The expression level of the c-myc was not modified by the over expression of np9. This work suggests a possible relationship between CLL and HERV-K np9 expression.
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Affiliation(s)
- Sabrina Fischer
- Laboratory of Molecular Virology, Centro de Investigaciones Nucleares, Facultad de Ciencias, Universidad de la República, Montevideo, Uruguay
| | - Natalia Echeverría
- Laboratory of Molecular Virology, Centro de Investigaciones Nucleares, Facultad de Ciencias, Universidad de la República, Montevideo, Uruguay
| | - Gonzalo Moratorio
- Laboratory of Molecular Virology, Centro de Investigaciones Nucleares, Facultad de Ciencias, Universidad de la República, Montevideo, Uruguay ; Department of Virology, Institut Pasteur, Paris, France
| | - Ana Inés Landoni
- Service of Hematology and Bone Marrow Transplantation, Hospital Maciel, Montevideo, Uruguay
| | | | - Juan Cristina
- Laboratory of Molecular Virology, Centro de Investigaciones Nucleares, Facultad de Ciencias, Universidad de la República, Montevideo, Uruguay
| | - Pablo Oppezzo
- Protein Recombinant Unit, Institut Pasteur, Montevideo, Uruguay
| | - Pilar Moreno
- Laboratory of Molecular Virology, Centro de Investigaciones Nucleares, Facultad de Ciencias, Universidad de la República, Montevideo, Uruguay ; Protein Recombinant Unit, Institut Pasteur, Montevideo, Uruguay
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Palacios F, Abreu C, Prieto D, Morande P, Ruiz S, Fernández-Calero T, Naya H, Libisch G, Robello C, Landoni AI, Gabus R, Dighiero G, Oppezzo P. Activation of the PI3K/AKT pathway by microRNA-22 results in CLL B-cell proliferation. Leukemia 2014; 29:115-25. [DOI: 10.1038/leu.2014.158] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2014] [Revised: 05/06/2014] [Accepted: 05/07/2014] [Indexed: 01/26/2023]
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Correa A, Pacheco S, Mechaly AE, Obal G, Béhar G, Mouratou B, Oppezzo P, Alzari PM, Pecorari F. Potent and specific inhibition of glycosidases by small artificial binding proteins (affitins). PLoS One 2014; 9:e97438. [PMID: 24823716 PMCID: PMC4019568 DOI: 10.1371/journal.pone.0097438] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2014] [Accepted: 04/17/2014] [Indexed: 01/05/2023] Open
Abstract
Glycosidases are associated with various human diseases. The development of efficient and specific inhibitors may provide powerful tools to modulate their activity. However, achieving high selectivity is a major challenge given that glycosidases with different functions can have similar enzymatic mechanisms and active-site architectures. As an alternative approach to small-chemical compounds, proteinaceous inhibitors might provide a better specificity by involving a larger surface area of interaction. We report here the design and characterization of proteinaceous inhibitors that specifically target endoglycosidases representative of the two major mechanistic classes; retaining and inverting glycosidases. These inhibitors consist of artificial affinity proteins, Affitins, selected against the thermophilic CelD from Clostridium thermocellum and lysozyme from hen egg. They were obtained from libraries of Sac7d variants, which involve either the randomization of a surface or the randomization of a surface and an artificially-extended loop. Glycosidase binders exhibited affinities in the nanomolar range with no cross-recognition, with efficient inhibition of lysozyme (Ki = 45 nM) and CelD (Ki = 95 and 111 nM), high expression yields in Escherichia coli, solubility, and thermal stabilities up to 81.1°C. The crystal structures of glycosidase-Affitin complexes validate our library designs. We observed that Affitins prevented substrate access by two modes of binding; covering or penetrating the catalytic site via the extended loop. In addition, Affitins formed salt-bridges with residues essential for enzymatic activity. These results lead us to propose the use of Affitins as versatile selective glycosidase inhibitors and, potentially, as enzymatic inhibitors in general.
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Affiliation(s)
- Agustín Correa
- Institut Pasteur de Montevideo, Recombinant Protein Unit, Montevideo, Uruguay
- Institut Pasteur, Unité de Microbiologie Structurale, CNRS UMR 3528, Paris, France
| | - Sabino Pacheco
- Institut Pasteur, Unité de Microbiologie Structurale, CNRS UMR 3528, Paris, France
- INSERM UMR 892 - CRCNA, Nantes, France
- CNRS UMR 6299, Nantes, France
- University of Nantes, Nantes, France
| | - Ariel E. Mechaly
- Institut Pasteur, Unité de Microbiologie Structurale, CNRS UMR 3528, Paris, France
| | - Gonzalo Obal
- Institut Pasteur de Montevideo, Protein Biophysics Unit, Montevideo, Uruguay
| | - Ghislaine Béhar
- INSERM UMR 892 - CRCNA, Nantes, France
- CNRS UMR 6299, Nantes, France
- University of Nantes, Nantes, France
| | - Barbara Mouratou
- INSERM UMR 892 - CRCNA, Nantes, France
- CNRS UMR 6299, Nantes, France
- University of Nantes, Nantes, France
| | - Pablo Oppezzo
- Institut Pasteur de Montevideo, Recombinant Protein Unit, Montevideo, Uruguay
| | - Pedro M. Alzari
- Institut Pasteur, Unité de Microbiologie Structurale, CNRS UMR 3528, Paris, France
| | - Frédéric Pecorari
- INSERM UMR 892 - CRCNA, Nantes, France
- CNRS UMR 6299, Nantes, France
- University of Nantes, Nantes, France
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Correa A, Ortega C, Obal G, Alzari P, Vincentelli R, Oppezzo P. Generation of a vector suite for protein solubility screening. Front Microbiol 2014; 5:67. [PMID: 24616717 PMCID: PMC3934309 DOI: 10.3389/fmicb.2014.00067] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2013] [Accepted: 02/05/2014] [Indexed: 12/15/2022] Open
Abstract
Recombinant protein expression has become an invaluable tool for academic and biotechnological projects. With the use of high-throughput screening technologies for soluble protein production, uncountable target proteins have been produced in a soluble and homogeneous state enabling the realization of further studies. Evaluation of hundreds conditions requires the use of high-throughput cloning and screening methods. Here we describe a new versatile vector suite dedicated to the expression improvement of recombinant proteins (RP) with solubility problems. This vector suite allows the parallel cloning of the same PCR product into the 12 different expression vectors evaluating protein expression under different promoter strength, different fusion tags as well as different solubility enhancer proteins. Additionally, we propose the use of a new fusion protein which appears to be a useful solubility enhancer. Above all we propose in this work an economic and useful vector suite to fast track the solubility of different RP. We also propose a new solubility enhancer protein that can be included in the evaluation of the expression of RP that are insoluble in classical expression conditions.
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Affiliation(s)
- Agustín Correa
- Recombinant Protein Unit, Institut Pasteur de Montevideo Montevideo, Uruguay
| | - Claudia Ortega
- Recombinant Protein Unit, Institut Pasteur de Montevideo Montevideo, Uruguay
| | - Gonzalo Obal
- Protein Biophysics Unit, Institut Pasteur de Montevideo Montevideo, Uruguay
| | - Pedro Alzari
- Unité de Microbiologie Structurale, Institut Pasteur, Paris France
| | - Renaud Vincentelli
- Centre National de la Recherche Scientifique, Aix-Marseille Université CNRS UMR7257, AFMB, Marseille, France
| | - Pablo Oppezzo
- Recombinant Protein Unit, Institut Pasteur de Montevideo Montevideo, Uruguay
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Libisch MG, Casás M, Chiribao M, Moreno P, Cayota A, Osinaga E, Oppezzo P, Robello C. GALNT11 as a new molecular marker in chronic lymphocytic leukemia. Gene 2013; 533:270-9. [PMID: 24076351 DOI: 10.1016/j.gene.2013.09.052] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2013] [Accepted: 09/17/2013] [Indexed: 01/27/2023]
Abstract
Aberrant mucin O-glycosylation often occurs in different cancers and is characterized by immature expression of simple mucin-type carbohydrates. At present, there are some controversial reports about the Tn antigen (GalNAcα-O-Ser/Thr) expression and there is a great lack of information about the [UDP-N-acetyl-α-d-galactosamine:polypeptide N-acetylgalactosaminyltransferase (GalNAc-Ts)] expression in chronic lymphocytic leukemia (CLL). To gain insight in these issues we evaluated the Tn antigen expression in CLL patient samples using two Tn binding proteins with different fine specificity. We also studied the expression from 14 GalNAc-Ts genes in CLL patients by RT-PCR. Our results have provided additional information about the expression level of the Tn antigen, suggesting that a low density of Tn residues is expressed in CLL cells. We also found that GALNT11 was expressed in CLL cells and normal T cell whereas little or no expression was found in normal B cells. Based on these results, GALNT11 expression was assessed by qPCR in a cohort of 50 CLL patients. We found significant over-expression of GALNT11 in 96% of B-CLL cells when compared to normal B cells. Moreover, we confirmed the expression of this enzyme at the protein level. Finally we found that GALNT11 expression was significantly associated with the mutational status of the immunoglobulin heavy chain variable region (IGHV), [א(2)(1)=18.26; P<0.0001], lipoprotein lipase expression [א(2)(1)=13.72; P=0.0002] and disease prognosis [א(2)(1)=15.49; P<0.0001]. Our evidence suggests that CLL patient samples harbor aberrant O-glycosylation highlighted by Tn antigen expression and that the over-expression of GALNT11 constitutes a new molecular marker for CLL.
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Affiliation(s)
- M G Libisch
- Molecular Biology Unit, Institut Pasteur de Montevideo, Montevideo, Uruguay
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Oppezzo P, Dighiero G. "Role of the B-cell receptor and the microenvironment in chronic lymphocytic leukemia''. Blood Cancer J 2013; 3:e149. [PMID: 24056719 PMCID: PMC3789209 DOI: 10.1038/bcj.2013.45] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2013] [Revised: 07/29/2013] [Accepted: 07/31/2013] [Indexed: 01/09/2023] Open
Abstract
Despite significant progress in treatment, chronic lymphocytic leukemia (CLL) remains an incurable disease. Advances have been made to understand the molecular pathogenesis underlying CLL progression and treatment resistance. We here review the available evidences concerning the role of the B-cell receptor (BCR) and the tumor microenvironment interactions in CLL pathogenesis. Antigen likely has a key role in the selection of the tumoral clone, the mutational status of immunoglobulin genes is a strong prognostic predictor and BCR signaling has been postulated to have a role for CLL trafficking and interaction with the stromal microenvironment. There is also important evidence, favoring a role for the microenvironment in CLL pathogenesis. Most, if not all, proliferative events occur in the lymph nodes and bone marrow, where leukemic cells receive through microenvironment interactions survival signals aiming to avoid apoptosis and acquire favorable tumoral growing conditions. In addition, the tumoral microenvironment appears to be the site where the acquisition of additional genetic lesions in the clone occur, which should greatly influence clinical outcome. The advent of new tyrosine kinase inhibitors which seem to be able to modulate microenvironment interactions and circumvent the p53 deletion have generated significant promise by raising the possibility that they could provide significant progress in disease treatment.
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Affiliation(s)
- P Oppezzo
- 1] Unit of Recombinant Protein, Institut Pasteur de Montevideo, Montevideo, Uruguay [2] Immunobiology Department, School of Medicine, Universidad de la República, Montevideo, Uruguay
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Abreu C, Moreno P, Palacios F, Borge M, Morande P, Landoni AI, Gabus R, Dighiero G, Giordano M, Gamberale R, Oppezzo P. Methylation status regulates lipoprotein lipase expression in chronic lymphocytic leukemia. Leuk Lymphoma 2013; 54:1844-8. [PMID: 23614796 DOI: 10.3109/10428194.2013.796057] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Among different prognostic factors in chronic lymphocytic leukemia (CLL), we previously demonstrated that lipoprotein lipase (LPL) is associated with an unmutated immunoglobulin profile and clinical poor outcome. Despite the usefulness of LPL for CLL prognosis, its functional role and the molecular mechanism regulating its expression are still open questions. Interaction of CLL B-cells with the tissue microenvironment favors disease progression by promoting malignant B-cell growth. Since tissue methylation can be altered by environmental factors, we investigated the methylation status of the LPL gene and the possibility that overexpression could be associated with microenvironment signals. Our results show that a demethylated state of the LPL gene is responsible for its anomalous expression in unmutated CLL cases and that this expression is dependent on microenvironment signals. Overall, this work proposes that an epigenetic mechanism, triggered by the microenvironment, regulates LPL expression in CLL disease.
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Affiliation(s)
- Cecilia Abreu
- Recombinant Protein Unit, Institut Pasteur de Montevideo, Montevideo, Uruguay
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Correa A, Trajtenberg F, Obal G, Pritsch O, Dighiero G, Oppezzo P, Buschiazzo A. Structure of a human IgA1 Fab fragment at 1.55 Å resolution: potential effect of the constant domains on antigen-affinity modulation. Acta Crystallogr D Biol Crystallogr 2013; 69:388-97. [PMID: 23519414 DOI: 10.1107/s0907444912048664] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/25/2012] [Accepted: 11/27/2012] [Indexed: 11/11/2022]
Abstract
Despite being the most abundant class of immunoglobulins in humans and playing central roles in the adaptive immune response, high-resolution structural data are still lacking for the antigen-binding region of human isotype A antibodies (IgAs). The crystal structures of a human Fab fragment of IgA1 in three different crystal forms are now reported. The three-dimensional organization is similar to those of other Fab classes, but FabA1 seems to be more rigid, being constrained by a hydrophobic core in the interface between the variable and constant domains of the heavy chain (VH-CH1) as well as by a disulfide bridge that connects the light and heavy chains, influencing the relative heavy/light-chain orientation. The crystal structure of the same antibody but with a G-isotype CH1 which is reported to display different antigen affinity has also been solved. The differential structural features reveal plausible mechanisms for constant/variable-domain long-distance effects whereby antibody class switching could alter antigen affinity.
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Affiliation(s)
- Agustin Correa
- Unit of Recombinant Proteins, Institut Pasteur de Montevideo, 11400 Montevideo, Uruguay
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30
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Almejun MB, Cols M, Zelazko M, Oleastro M, Cerutti A, Oppezzo P, Cunningham-Rundles C, Danielian S. Naturally occurring mutation affecting the MyD88-binding site of TNFRSF13B impairs triggering of class switch recombination. Eur J Immunol 2013; 43:805-14. [PMID: 23225259 DOI: 10.1002/eji.201242945] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2012] [Revised: 10/22/2012] [Accepted: 12/04/2012] [Indexed: 11/06/2022]
Abstract
Mutations in the transmembrane activator and calcium-modulating cyclophilin ligand interactor (TACI) were previously found to be associated with hypogammaglobulinemia in humans. It has been shown that proliferation inducing ligand (APRIL) elicits class switch recombination (CSR) by inducing recruitment of MyD88 to a TACI highly conserved cytoplasmic domain (THC). We have identified a patient with hypogammaglobulinemia carrying a missense mutation (S231R) predicted to affect the THC. Aiming to evaluate the relevance of this novel mutation of TACI in CSR induction, we tested the ability of TACI, TLR9, or/and CD40 ligands to trigger CSR in naive B cells and B-cell lines carrying S231R. IgG secretion was impaired when triggered by TACI or/and TLR9 ligands on S231R-naive B cells. Likewise, these stimuli induced less expression of activation-induced cytidine deaminase, I(γ)1-C(μ), and I(γ)1-C(μ), while induction by optimal CD40 stimulation was indistinguishable from controls. These cells also showed an impaired cooperation between TACI and TLR9 pathways, as well as a lack of APRIL-mediated enhancement of CD40 activation in suboptimal conditions. Finally, after APRIL ligation, S231R-mutated TACI failed to colocalize with MyD88. Collectively, these results highlight the requirement of an intact MyD88-binding site in TACI to trigger CSR.
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Affiliation(s)
- Maria B Almejun
- Servicio de Inmunología y Reumatología, Hospital Nacional de Pediatría Prof. Dr. Juan P. Garrahan, Buenos Aires, Argentina
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Rego N, Bianchi S, Moreno P, Persson H, Kvist A, Pena A, Oppezzo P, Naya H, Rovira C, Dighiero G, Pritsch O. Search for an aetiological virus candidate in chronic lymphocytic leukaemia by extensive transcriptome analysis. Br J Haematol 2012; 157:709-17. [PMID: 22489537 PMCID: PMC7161782 DOI: 10.1111/j.1365-2141.2012.09116.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2011] [Accepted: 03/06/2012] [Indexed: 11/28/2022]
Abstract
As an approach to determining the aetiology of chronic lymphocytic leukaemia (CLL), we searched for a virus expressed in human CLL B‐cells by combining high‐throughput sequencing and digital subtraction. Pooled B‐cell mRNA transcriptomes from five CLL patients and five healthy donors were sequenced with 454 Life Sciences technology. Human reads were excluded by BLAST (Basic Local Alignment Search Tool) and BLAT (BLAST‐like alignment tool) searches. Remaining reads were screened with BLAST against viral databases. Purified B‐cells from two CLL patients, with and without stimulation by phorbol‐esters, were sequenced using Illumina technology to achieve depth of sequencing. Burrows‐Wheeler Aligner mapping and BLAST searches were used for the Illumina data. Pyrosequencing resulted in about 400 000 reads per sample. No viral candidate could be found. Illumina single‐end sequencing for 115 cycles yielded an average of 26 ± 2·5 million filtered reads per sample, of which 2·2 ± 0·6 million remained unmapped to human references. BLAST searches of these reads against viral and human databases assigned nine reads to an Epstein‐Barr virus origin, in one sample following phorbol‐ester stimulation. Other reads showing a putative viral origin were dismissed after further analysis. Despite an in‐depth analysis of the CLL transcriptome reaching more than 100 million sequences, we have not found evidence for a putative viral candidate in CLL.
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Affiliation(s)
- Natalia Rego
- Institut Pasteur de Montevideo, Montevideo, Uruguay
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32
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Nannini PR, Borge M, Mikolaitis VC, Abreu C, Morande PE, Zanetti SR, Oppezzo P, Palacios F, Ledesma I, Bezares RF, Giordano M, Gamberale R. CCR4 expression in a case of cutaneous Richter's transformation of chronic lymphocytic leukemia (CLL) to diffuse large B-cell lymphoma (DLBCL) and in CLL patients with no skin manifestations. Eur J Haematol 2011; 87:80-6. [PMID: 21443542 DOI: 10.1111/j.1600-0609.2011.01613.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
OBJECTIVE Richter's transformation of B-cell chronic lymphocytic leukemia (CLL) to cutaneous diffuse large B-cell lymphoma (DLBCL) is very rare. We took the advantage of one of these cases to test the hypothesis that the chemokine receptor CCR4 is involved in the homing of CLL cells to skin. PATIENTS AND METHODS We evaluated CCR4 expression by flow cytometry in both circulating and skin CD19(+) leukemic cells from a patient with cutaneous DLBCL. As controls, we used peripheral blood samples from CLL patients without skin manifestations and from elderly healthy donors. RESULTS We found that both DLBCL cells derived from the original CLL clone and circulating CLL cells from this patient expressed CCR4. Although it was previously reported that CCR4 is not expressed in CLL cells, we found that a low but significant proportion of leukemic cells from CLL patients with no skin manifestations do express CCR4. There was a positive correlation between the expression of CCR4 and the percentage of ZAP-70 of each sample. Moreover, we consistently observed a higher expression of CCR4 within CD19(+)CD38(+) and CD19(+)Ki67(+) subsets compared to CD19(+)CD38(-) and CD19(+)Ki67(-) lymphocytes from the same sample, respectively. CONCLUSION We conclude that the chemokine receptor CCR4 is not a special feature of CLL cells with skin manifestation, but rather it is expressed in a low but significant proportion of peripheral blood CLL cells.
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Affiliation(s)
- Paula Romina Nannini
- Laboratorio de Inmunología Oncológica, Instituto de Investigaciones Hematológicas, Academia Nacional de Medicina, Ciudad de Buenos Aires, Argentina
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33
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Hubert P, Heitzmann A, Viel S, Nicolas A, Sastre-Garau X, Oppezzo P, Pritsch O, Osinaga E, Amigorena S. Antibody-dependent cell cytotoxicity synapses form in mice during tumor-specific antibody immunotherapy. Cancer Res 2011; 71:5134-43. [PMID: 21697279 DOI: 10.1158/0008-5472.can-10-4222] [Citation(s) in RCA: 85] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Antibody-dependent cell cytotoxicity (ADCC) plays a critical role in monoclonal antibody (mAb)-mediated cancer therapy. ADCC, however, has not been directly shown in vivo but inferred from the requirement for IgG Fc receptors (FcγR) in tumor rejection in mice. Here, we investigated the mechanism of action of a Tn antigen-specific chimeric mAb (Chi-Tn), which binds selectively to a wide variety of carcinomas, but not to normal tissues, in both humans and mice. Chi-Tn mAb showed no direct toxicity against carcinomas cell lines in vitro but induced the rejection of a murine breast tumor in 80% to 100% of immunocompetent mice, when associated with cyclophosphamide. Tumor rejection was abolished in Fc receptors-associated γ chain (FcR-γ)-deficient mice, suggesting a role for ADCC. Indeed, tumor cells formed stable conjugates in vivo with FcR-γ chain-expressing macrophages and neutrophils in Chi-Tn mAb-treated but not in control mAb-treated mice. The contact zone between tumor cells and ADCC effectors accumulated actin, FcγR and phospho-tyrosines. The in vivo formed ADCC synapses were organized in multifocal supra-molecular activation clusters. These results show that in vivo ADCC mediated by macrophages and neutrophils during tumor rejection by Chi-Tn mAb involves a novel type of multifocal immune synapse between effectors of innate immunity and tumor cells.
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Affiliation(s)
- Pascale Hubert
- Institut Curie, Hôpital, Département de Biologie des tumeurs, Paris, France
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Correa A, Oppezzo P. Tuning different expression parameters to achieve soluble recombinant proteins in E. coli: advantages of high-throughput screening. Biotechnol J 2011; 6:715-30. [PMID: 21567962 DOI: 10.1002/biot.201100025] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2011] [Revised: 03/15/2011] [Accepted: 03/21/2011] [Indexed: 01/04/2023]
Abstract
Proteins are the main reagents for structural, biomedical, and biotechnological studies; however, some important challenges remain concerning protein solubility and stability. Numerous strategies have been developed, with some success, to mitigate these challenges, but a universal strategy is still elusive. Currently, researchers face a plethora of alternatives for the expression of the target protein, which generates a great diversity of conditions to be evaluated. Among these, different promoter strength, diverse expression host and constructs, or special culture conditions have an important role in protein solubility. With the arrival of automated high-throughput screening (HTS) systems, the evaluation of hundreds of different conditions within reasonable cost and time limits is possible. This technology increases the chances to obtain the target protein in a pure, soluble, and stable state. This review focuses on some of the most commonly used strategies for the expression of recombinant proteins in the enterobacterium Escherichia coli, including the use of HTS for the production of soluble proteins.
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Affiliation(s)
- Agustín Correa
- Recombinant Protein Unit, Institut Pasteur de Montevideo, Montevideo, Uruguay
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35
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Oppezzo P, Obal G, Baraibar MA, Pritsch O, Alzari PM, Buschiazzo A. Crystal structure of an enzymatically inactive trans-sialidase-like lectin from Trypanosoma cruzi: the carbohydrate binding mechanism involves residual sialidase activity. Biochim Biophys Acta 2011; 1814:1154-61. [PMID: 21570497 DOI: 10.1016/j.bbapap.2011.04.012] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/28/2011] [Revised: 03/21/2011] [Accepted: 04/15/2011] [Indexed: 10/18/2022]
Abstract
Trans-sialidases are surface-located proteins in Trypanosoma cruzi that participate in key parasite-host interactions and parasite virulence. These proteins are encoded by a large multigenic family, with tandem-repeated and individual genes dispersed throughout the genome. While a large number of genes encode for catalytically active enzyme isoforms, many others display mutations that involve catalytic residues. The latter ultimately code for catalytically inactive proteins with very high similarity to their active paralogs. These inactive members have been shown to be lectins, able to bind sialic acid and galactose in vitro, although their cellular functions are yet to be fully established. We now report structural and biochemical evidence extending the current molecular understanding of these lectins. We have solved the crystal structure of one such catalytically inactive trans-sialidase-like protein, after soaking with a specific carbohydrate ligand, sialyl-α2,3-lactose. Instead of the expected trisaccharide, the binding pocket was observed occupied by α-lactose, strongly suggesting that the protein retains residual hydrolytic activity. This hypothesis was validated by enzyme kinetics assays, in comparison to fully active wild-type trans-sialidase. Surface plasmon resonance also confirmed that these trans-sialidase-like lectins are not only able to bind small oligosaccharides, but also sialylated glycoproteins, which is relevant in the physiologic scenario of parasite infection. Inactive trans-sialidase proteins appear thus to be β-methyl-galactosyl-specific lectins, evolved within an exo-sialidase scaffold, thus explaining why their lectin activity is triggered by the presence of terminal sialic acid.
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Affiliation(s)
- Pablo Oppezzo
- Institut Pasteur, Unité de Biochimie Structurale, Paris 75015, France
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36
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Bianchi S, Moreno P, Landoni AI, Naya H, Oppezzo P, Dighiero G, Gabús R, Pritsch O. Immunoglobulin heavy chain V-D-J gene rearrangement and mutational status in Uruguayan patients with chronic lymphocytic leukemia. Leuk Lymphoma 2010; 51:2070-8. [PMID: 20929321 DOI: 10.3109/10428194.2010.522283] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
B-cell chronic lymphocytic leukemia (CLL) is characterized by the accumulation of long-lived circulating clonal leukemic B-cells, although the etiopathogenesis remains unclear. The incidence of CLL is variable in different regions around the world. While it is the most frequent chronic leukemia in Western countries, it has a low incidence in Asia. In this work we have investigated the immunoglobulin heavy chain gene rearrangements and mutational status in 80 Uruguayan patients with CLL, and compared these results with those obtained in other geographic regions. Our results demonstrate that Uruguayan patients with CLL display an IGHV gene usage which resembles that observed in Mediterranean countries and exhibits certain differences compared with Brazilian and Asian series, as expected, considering the ethnic basis of the Uruguayan population. This suggests that genetic influences could be important in the development and etiopathogenesis of CLL, but larger studies are necessary to substantiate this possibility.
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37
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Galletti J, Cañones C, Morande P, Borge M, Oppezzo P, Geffner J, Bezares R, Gamberale R, Giordano M. Chronic lymphocytic leukemia cells bind and present the erythrocyte protein band 3: possible role as initiators of autoimmune hemolytic anemia. J Immunol 2008; 181:3674-83. [PMID: 18714043 DOI: 10.4049/jimmunol.181.5.3674] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
The mechanisms underlying the frequent association between chronic lymphocytic leukemia (CLL) and autoimmune hemolytic anemia are currently unclear. The erythrocyte protein band 3 (B3) is one of the most frequently targeted Ags in autoimmune hemolytic anemia. In this study, we show that CLL cells specifically recognize B3 through a still unidentified receptor. B3 interaction with CLL cells involves the recognition of its N-terminal domain and leads to its internalization. Interestingly, when binding of erythrocyte-derived vesicles as found physiologically in blood was assessed, we observed that CLL cells could only interact with inside-out vesicles, being this interaction strongly dependent on the recognition of the N-terminal portion of B3. We then examined T cell responses to B3 using circulating CLL cells as APCs. Resting B3-pulsed CLL cells were unable to induce T cell proliferation. However, when deficient costimulation was overcome by CD40 engagement, B3-pulsed CLL cells were capable of activating CD4(+) T cells in a HLA-DR-dependent fashion. Therefore, our work shows that CLL cells can specifically bind, capture, and present B3 to T cells when in an activated state, an ability that could allow the neoplastic clone to trigger the autoaggressive process against erythrocytes.
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Affiliation(s)
- Jeremías Galletti
- Department of Immunology, Institute for Hematologic Research, National Academy of Medicine, Buenos Aires, Argentina
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38
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Watts AG, Oppezzo P, Withers SG, Alzari PM, Buschiazzo A. Structural and Kinetic Analysis of Two Covalent Sialosyl-Enzyme Intermediates on Trypanosoma rangeli Sialidase. J Biol Chem 2006; 281:4149-55. [PMID: 16298994 DOI: 10.1074/jbc.m510677200] [Citation(s) in RCA: 72] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Trypanosoma rangeli sialidase is a glycoside hydrolase (family GH33) that catalyzes the cleavage of alpha-2-->3-linked sialic acid residues from sialoglycoconjugates with overall retention of anomeric configuration. Retaining glycosidases usually operate through a ping-pong mechanism, wherein a covalent intermediate is formed between the carbohydrate and an active site carboxylic acid of the enzyme. Sialidases, instead, appear to use a tyrosine as the catalytic nucleophile, leaving the possibility of an essentially different catalytic mechanism. Indeed, a direct nucleophilic role for a tyrosine was shown for the homologous trans-sialidase from Trypanosoma cruzi, although itself not a typical sialidase. Here we present the three-dimensional structures of the covalent glycosyl-enzyme complexes formed by the T. rangeli sialidase with two different mechanism-based inactivators at 1.9 and 1.7 Angstroms resolution. To our knowledge, these are the first reported structures of enzymatically competent covalent intermediates for a strictly hydrolytic sialidase. Kinetic analyses have been carried out on the formation and turnover of both intermediates, showing that structural modifications to these inactivators can be used to modify the lifetimes of covalent intermediates. These results provide further evidence that all sialidases likely operate through a similar mechanism involving the transient formation of a covalently sialylated enzyme. Furthermore, we believe that the ability to "tune" the inactivation and reactivation rates of mechanism-based inactivators toward specific enzymes represents an important step toward developing this class of inactivators into therapeutically useful compounds.
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Affiliation(s)
- Andrew G Watts
- Department of Chemistry, University of British Columbia, Vancouver, Canada
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39
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Oppezzo P, Dighiero G. What do somatic hypermutation and class switch recombination teach us about chronic lymphocytic leukaemia pathogenesis? Curr Top Microbiol Immunol 2006; 294:71-89. [PMID: 16323428 DOI: 10.1007/3-540-29933-5_5] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
B-CLL cells express CD5 and IgM/IgD and thus have a mantle zone-like phenotype of naive cells, which, in normal conditions express unmutated Ig genes. However, recent studies have shown that 50%-70% of CLL harbour somatic mutations of VH genes, as if they had matured in a lymphoid follicle. Interestingly, the presence or absence of somatic hypermutation (SHM) process is associated with the use of particular VH genes. Particular alleles of the VH1-69 gene and the VH4-39 gene are preferentially expressed in an unmutated form, while VH4-34 or the majority of VH3 family genes frequently contain somatic mutations. The fact that some genes like VH1-69 and VH3-07 recombine this VH segment to particular JH segments and the restricted use of CDR3 sequences by CLLs expressing the VH4-39 gene suggest that the observed differences in BCR structure in B-CLL could result from selection by distinct antigenic epitopes. It is currently unclear whether this putative antigen-driven process could occur prior to leukaemic transformation and/or that the precursors were transformed into leukaemic cells at distinct maturational stages. The mutational profile of Ig genes has been shown to be associated with disease prognosis. These results could favour the idea that CLL could correspond to two different diseases that look alike in morphologic and phenotypic terms. In CLL with mutated Ig genes, the proliferating B cell may have transited through germinal centres, the physiologic site of hypermutation, whereas in CLL with unmutated Ig genes the malignant B cell may derive from a pre-germinal centre naïve B cell. Despite these clinical and molecular differences, recent studies on gene expression profiling of B-CLL cells showed that CLL is characterized by a common gene expression signature that is irrespective of Ig mutational status and differs from other lymphoid cancers and normal lymphoid subpopulations, suggesting that CLL cases share a common mechanism of transformation and/or cell of origin. Activation induced cytidine deaminase (AID) plays a key role in SHM and class switch recombination (CSR). However, the mechanisms accounting for AID action and control of its expression remain unclear. In a recent work we have shown that in contrast to normal circulating B-cells, AID transcripts are expressed constitutively in CLL patients undergoing active CSR, but interestingly this expression occurs predominately in unmutated CLL B-cells. These data favour the view that AID protein may act differentially on CSR and SHM pathways, but the role-played by AID in both processes remains to be elucidated. Recent work indicates that AID is expressed in a small fraction of tumoral cells, which could suggest that this small fraction of cells may correspond to B-CLL cells that would have recently experienced an AID-inducing stimulus occurring in a specific microenvironment.
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MESH Headings
- B-Lymphocytes/immunology
- Cytidine Deaminase
- Cytosine Deaminase/genetics
- Gene Expression
- Humans
- Immunoglobulin Class Switching
- Immunoglobulin Heavy Chains/genetics
- Immunoglobulin Variable Region/genetics
- Leukemia, Lymphocytic, Chronic, B-Cell/etiology
- Leukemia, Lymphocytic, Chronic, B-Cell/genetics
- Leukemia, Lymphocytic, Chronic, B-Cell/immunology
- Models, Biological
- Somatic Hypermutation, Immunoglobulin
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Affiliation(s)
- P Oppezzo
- Service d'Immuno-Hematologie, Institute Pasteur, Paris, France
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40
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Vasconcelos Y, De Vos J, Vallat L, Rème T, Lalanne AI, Wanherdrick K, Michel A, Nguyen-Khac F, Oppezzo P, Magnac C, Maloum K, Ajchenbaum-Cymbalista F, Troussard X, Leporrier M, Klein B, Dighiero G, Davi F. Gene expression profiling of chronic lymphocytic leukemia can discriminate cases with stable disease and mutated Ig genes from those with progressive disease and unmutated Ig genes. Leukemia 2005; 19:2002-5. [PMID: 16121219 DOI: 10.1038/sj.leu.2403865] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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41
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Oppezzo P, Vasconcelos Y, Settegrana C, Jeannel D, Vuillier F, Legarff-Tavernier M, Kimura EY, Bechet S, Dumas G, Brissard M, Merle-Béral H, Yamamoto M, Dighiero G, Davi F. The LPL/ADAM29 expression ratio is a novel prognosis indicator in chronic lymphocytic leukemia. Blood 2005; 106:650-7. [PMID: 15802535 DOI: 10.1182/blood-2004-08-3344] [Citation(s) in RCA: 95] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Although the zeta-associated protein of 70 kDa (ZAP-70) is overexpressed in patients with chronic lymphocytic leukemia (CLL) displaying unmutated IGVH genes and poor prognosis, a previous microarray study from our group identified overexpression of LPL and ADAM29 genes among unmutated and mutated CLL, respectively. To assess the prognostic value of these genes, we quantified their expression by real-time quantitative polymerase chain reaction (PCR) in a cohort of 127 patients with CLL and correlated this with clinical outcome, IGVH mutational status, and ZAP-70 protein expression. IGVH mutational status, ZAP-70, and the LPL and ADAM29 mRNA ratios (L/A ratio) were predictive of event-free survival for the whole cohort and for patients with stage A disease. In patients in stage B and C, the L/A ratio was an independent prognostic factor, whereas ZAP-70 did not predict survival. Simultaneous usage of the L/A ratio and ZAP-70 expression allowed an almost perfect (99%) assessment of the IGVH status in the 80% of patients with concordant results (L/A+, ZAP-70+ or L/A-, ZAP-70-). LPL and ADAM29 gene expression could also be determined by a simple competitive multiplex reverse transcription PCR assay. Overall, quantification of LPL and ADAM29 gene expression is a strong prognostic indicator in CLL, providing better prognostic assessment than ZAP-70 in advanced stages of the disease.
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MESH Headings
- ADAM Proteins
- Base Sequence
- Biomarkers, Tumor/genetics
- Case-Control Studies
- DNA, Complementary/genetics
- DNA, Neoplasm/genetics
- Female
- Gene Expression
- Genes, Immunoglobulin
- Humans
- Immunoglobulin Heavy Chains/genetics
- Leukemia, Lymphocytic, Chronic, B-Cell/enzymology
- Leukemia, Lymphocytic, Chronic, B-Cell/genetics
- Lipoprotein Lipase/genetics
- Male
- Metalloendopeptidases/genetics
- Middle Aged
- Mutation
- Prognosis
- Protein-Tyrosine Kinases/genetics
- Reproducibility of Results
- Reverse Transcriptase Polymerase Chain Reaction
- ZAP-70 Protein-Tyrosine Kinase
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Affiliation(s)
- Pablo Oppezzo
- Unité d'Immuno-Hématologie et d'Immunopathologie, Institut Pasteur, Paris, France
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42
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Vuillier F, Dumas G, Magnac C, Prevost MC, Lalanne AI, Oppezzo P, Melanitou E, Dighiero G, Payelle-Brogard B. Lower levels of surface B-cell-receptor expression in chronic lymphocytic leukemia are associated with glycosylation and folding defects of the μ and CD79a chains. Blood 2005; 105:2933-40. [PMID: 15591116 DOI: 10.1182/blood-2004-09-3643] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
AbstractLow levels of B-cell-receptor (BCR) expression are the hallmark of tumoral B lymphocytes in B-cell chronic lymphocytic leukemia (B-CLL). These cells also respond inadequately to stimulation through the BCR. This receptor consists of a surface immunoglobulin associated with a CD79a/CD79b heterodimer. We previously showed that the intracellular synthesis of BCR components, from transcription onward, is normal. Here, we investigated the glycosylation status and cellular localization of μ, CD79a, and CD79b chains in 10 CLL patients differing in surface immunoglobulin M (IgM) expression. We reported a severe impairment of the glycosylation and folding of μ and CD79a. These defects were associated with the retention of both chains in the endoplasmic reticulum and lower levels of surface IgM expression. In contrast, no clear impairment of glycosylation and folding was observed for CD79b. No sequence defects were identified for BCR components and for the chaperone proteins involved in BCR folding processes. These data show, for the first time, that lower levels of BCR surface expression observed in CLL are accounted for by an impaired glycosylation and folding of the μ and CD79a chains.
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MESH Headings
- Aged
- Antigens, CD/chemistry
- Antigens, CD/genetics
- Antigens, CD/metabolism
- B-Lymphocytes/metabolism
- B-Lymphocytes/ultrastructure
- CD79 Antigens
- Dimerization
- Endoplasmic Reticulum/metabolism
- Endoplasmic Reticulum/ultrastructure
- Female
- Gene Expression Regulation, Leukemic
- Glycosylation
- Golgi Apparatus/metabolism
- Golgi Apparatus/ultrastructure
- Humans
- Immunoglobulin M/chemistry
- Immunoglobulin M/genetics
- Immunoglobulin M/metabolism
- Leukemia, Lymphocytic, Chronic, B-Cell/metabolism
- Leukemia, Lymphocytic, Chronic, B-Cell/physiopathology
- Male
- Microscopy, Electron
- Middle Aged
- Molecular Chaperones/metabolism
- Protein Folding
- Receptor Aggregation
- Receptors, Antigen, B-Cell/chemistry
- Receptors, Antigen, B-Cell/genetics
- Receptors, Antigen, B-Cell/metabolism
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Affiliation(s)
- Françoise Vuillier
- Unité d'Immuno-Hématologie et d'Immunopathologie, Plate-forme de Microscopie Electronique, Institut Pasteur, 28 rue du Dr Roux, 75724 Paris Cedex 15, France.
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43
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Oppezzo P, Dumas G, Lalanne AI, Payelle-Brogard B, Magnac C, Pritsch O, Dighiero G, Vuillier F. Different isoforms of BSAP regulate expression of AID in normal and chronic lymphocytic leukemia B cells. Blood 2004; 105:2495-503. [PMID: 15561888 DOI: 10.1182/blood-2004-09-3644] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
Abstract
Activation-induced cytidine deaminase (AID) is key to initiating somatic hypermutation (SHM) and class switch recombination (CSR), but its mode of action and regulation remains unclear. Since Pax-5 and Id-2 transcription factors play an opposing role in AID regulation, we have studied the expression of Pax-5, Id-2, and prdm-1 genes in 54 chronic lymphocytic leukemia (CLL) B cells. In 21 cases, presence of AID is constantly associated with high expression of the complete form of the Pax-5 gene (Pax-5a) and lower expression of the Id-2 and prdm-1 transcripts. In 33 cases, the absence of AID expression and CSR is associated with a reduction of Pax-5a and the appearance of a spliced form with a deletion in exon 8 (Pax-5/Delta-Ex8). Stimulation with CD40L+interleukin 4 (IL-4) induces CSR, the presence of AID transcripts, up-regulation of Pax-5a and down-regulation of Pax-5/Delta-Ex8, and Id-2 and prdm-1 transcripts. Pax-5a and Pax-5/Delta-Ex8 are translated into 2 isoforms of the B-cell-specific activator protein (BSAP) and both are able to bind the AID-promoter region. Overall, these results suggest that Pax-5/Delta-Ex8 could play an important role in the control of its own transcription and indirectly in AID expression and CSR.
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MESH Headings
- Adult
- Aged
- Aged, 80 and over
- B-Lymphocytes/immunology
- B-Lymphocytes/metabolism
- B-Lymphocytes/pathology
- Base Sequence
- CD40 Ligand
- Cytidine Deaminase
- Cytosine Deaminase/immunology
- Cytosine Deaminase/metabolism
- Female
- Gene Expression Regulation, Enzymologic/immunology
- Gene Expression Regulation, Leukemic/immunology
- Humans
- Inhibitor of Differentiation Protein 2/immunology
- Inhibitor of Differentiation Protein 2/metabolism
- Leukemia, Lymphocytic, Chronic, B-Cell/immunology
- Leukemia, Lymphocytic, Chronic, B-Cell/metabolism
- Leukemia, Lymphocytic, Chronic, B-Cell/pathology
- Male
- Middle Aged
- PAX5 Transcription Factor/immunology
- PAX5 Transcription Factor/metabolism
- Positive Regulatory Domain I-Binding Factor 1
- Protein Isoforms/immunology
- Protein Isoforms/metabolism
- Repressor Proteins/immunology
- Repressor Proteins/metabolism
- Sequence Deletion/immunology
- Somatic Hypermutation, Immunoglobulin/immunology
- Transcription Factors/immunology
- Transcription Factors/metabolism
- Transcription, Genetic/immunology
- Tumor Cells, Cultured
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Affiliation(s)
- Pablo Oppezzo
- Unité d'Immuno-hématologie et d'Immunopathologie, Institut Pasteur, 28 Rue Docteur Roux, 75015 Paris, France.
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44
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Oppezzo P, Dumas G, Bouvet JP, Robello C, Cayota A, Pizarro JC, Dighiero G, Pritsch O. Somatic mutations can lead to a loss of superantigenic and polyreactive binding. Eur J Immunol 2004; 34:1423-32. [PMID: 15114676 DOI: 10.1002/eji.200424936] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Although antibodies have been assumed to bind a specific antigen, evidence exists showing that a single antibody can bind to multiple unrelated antigens. We previously studied a human monoclonal antibody expressing a mutated form of the V(H)3-73 gene and displaying anti-tubulin activity in a patient suffering from an immunocytic lymphoma. Despite its expression of a V(H)3 family member, this immunoglobulin failed to react with protein A (SpA), suggesting that somatic mutations could account for its change in specificity. To examine this possibility, we produced recombinant Ig expressing germ-line (IgM kappa-Germ) or the mutated form (IgM kappa-PER) of the V(H)3-73 fragment. Comparison of the respective affinities of the two Ig demonstrated that IgM kappa-Germ restores its SpA-binding capacity, and shows a moderate decrease in its affinity for tubulin. Interestingly, IgM kappa-Germ displayed polyreactive specificity for different autoantigens, which contrasted to the monospecific binding of IgM kappa-PER to tubulin. These results suggest that the monoreactive IgM kappa-PER antibody may be derived from a natural polyreactive antibody through somatic mutation. In addition, both temperature modification and mild denaturation succeeded in recovering the polyreactivity of IgM kappa-PER, which favors the view that conformational modifications of the tertiary structure of antibodies may play a key role in the genesis of polyreactivity.
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Affiliation(s)
- Pablo Oppezzo
- Unité d'Immuno-Hématologie et d'Immunopathologie, Institut Pasteur, Paris, France
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45
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Vasconcelos Y, Davi F, Levy V, Oppezzo P, Magnac C, Michel A, Yamamoto M, Pritsch O, Merle-Béral H, Maloum K, Ajchenbaum-Cymbalista F, Dighiero G. Binet's staging system and VH genes are independent but complementary prognostic indicators in chronic lymphocytic leukemia. J Clin Oncol 2003; 21:3928-32. [PMID: 14581416 DOI: 10.1200/jco.2003.02.134] [Citation(s) in RCA: 66] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
PURPOSE Rai's and Binet's staging systems have contributed significantly to the identification of major prognostic groups in chronic lymphocytic leukemia (CLL), though they fail to accurately predict disease progression at the individual level. Biologic factors, such as the mutational status of the immunoglobulin heavy-chain variable genes (VH, cytogenetics, CD38 expression, and some serum markers, have recently improved prognostic assessment in CLL. In this study, we analyzed the prognostic value of VH mutational status within the different stages of Binet's classification in 145 patients. PATIENTS AND METHODS Our series consisted of 83 VH mutated (MT) and 62 VH unmutated (UM) patients. MT cases predominated within Binet's stage A (70%), whereas UM cases predominated among stages B and C (62%). RESULTS Median overall survival (OS) was 84 months for UM patients and was not achieved for the MT group (70% 12-year survival, P <.0001). Concerning Binet's stage A, both median OS and progression-free survival were significantly shorter for UM patients when compared with those of MT patients (97 months v not achieved, P =.0017; and 42 v 156 months, P <.0001), which compared favorably with the classical A' and A" substaging. The VH mutational profile could also segregate stage B and C patients into two groups with different survival patterns (median OS, 78 v 120 months for UM and MT patients, respectively; P =.002). CONCLUSION The significant survival differences observed between the VH mutational groups, among stage A and stage B and C patients, indicate that Binet's classification and VH genes are independent prognostic variables and are most likely complementary.
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MESH Headings
- Brazil
- Disease Progression
- Disease-Free Survival
- France
- Humans
- Immunoglobulin Variable Region/genetics
- Leukemia, Lymphocytic, Chronic, B-Cell/genetics
- Leukemia, Lymphocytic, Chronic, B-Cell/mortality
- Leukemia, Lymphocytic, Chronic, B-Cell/pathology
- Male
- Mutation
- Neoplasm Recurrence, Local/genetics
- Neoplasm Recurrence, Local/mortality
- Neoplasm Recurrence, Local/pathology
- Neoplasm Staging/methods
- Prognosis
- Survival Analysis
- Uruguay
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46
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Tiscornia AC, Cayota A, Landoni AI, Brito C, Oppezzo P, Vuillier F, Robello C, Dighiero G, Gabús R, Pritsch O. Post-transcriptional regulation of inducible nitric oxide synthase in chronic lymphocytic leukemia B cells in pro- and antiapoptotic culture conditions. Leukemia 2003; 18:48-56. [PMID: 14574328 DOI: 10.1038/sj.leu.2403169] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Functional inducible NOS (iNOS) may be involved in the prolonged lifespan of chronic lymphocytic leukemia cells (B-CLL), although the exact mechanisms implicated remain elusive as yet. In this work, we have examined iNOS expression in normal B lymphocytes and B-CLL cells in pro- and antiapoptotic conditions. Our results demonstrate: (1) The existence of a new splice variant characterized by a complete deletion of exon 14 (iNOS 13-16(14del)), which was preferentially detected in normal B lymphocytes and may represent an isoform that could play a role in the regulation of enzyme activity. (2) The existence of another alternatively spliced iNOS mRNA transcript involving a partial deletion of the flavodoxin region (iNOS 13-16(neg)) was correlated to a decreased B-CLL cell viability. The 9-beta-D-arabinofuranosyl-2-fluoradenine or fludarabine (F-ara) treatment induced iNOS 13-16(neg) transcript variants, whereas IL-4 enhanced both the transcription of variants, including these exons (iNOS 13-16(pos)), and the expression of a 122 kDa iNOS protein. These results suggest that in B-CLL, a regulation process involving nitric oxide (.- NO) levels could occur by a post-transcriptional mechanism mediated by soluble factors. Our results also provide an insight into a new complementary proapoptotic action of F-ara in B-CLL by the induction of particular iNOS splice variants, leading to the activation of a caspase-3-dependent apoptotic pathway.
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MESH Headings
- Aged
- Aged, 80 and over
- Alternative Splicing
- Antineoplastic Agents/pharmacology
- Apoptosis/physiology
- B-Lymphocytes/enzymology
- Base Sequence
- Caspase 3
- Caspases/metabolism
- DNA (Cytosine-5-)-Methyltransferases/antagonists & inhibitors
- Female
- Gene Expression Regulation, Enzymologic
- Gene Expression Regulation, Leukemic
- Humans
- Interleukin-4/pharmacology
- Isoenzymes
- Leukemia, Lymphocytic, Chronic, B-Cell/enzymology
- Male
- Middle Aged
- Molecular Sequence Data
- Nitric Oxide/physiology
- Nitric Oxide Synthase/genetics
- Nitric Oxide Synthase Type II
- RNA Processing, Post-Transcriptional
- RNA, Messenger/metabolism
- Sequence Deletion
- Sequence Homology, Nucleic Acid
- Signal Transduction
- Transcription, Genetic
- Vidarabine/analogs & derivatives
- Vidarabine/pharmacology
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Affiliation(s)
- A C Tiscornia
- Departamento de Bioquímica, de la Facultad de Medicina, Universidad de la República, Montevideo, Uruguay
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47
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Abstract
In 1900, the group from Metchnikoff suggested the concept of autoimmunization by demonstrating the presence of autoantibodies in normal conditions; which was opposed to the concept of horror autotoxicus raised by Ehrlich. Landsteiner's description of the transfusion compatibility rules and 50 year-later work from Burnett's and Medawar's groups lead to the clonal deletion theory as a general explanation of tolerance and autoimmunity. However, more recent work succeeded demonstrating that autoreactive B cells constitute a substantial part of the B-cell repertoire and that this autoreactive repertoire secretes the so-called natural autoantibodies (NAA) characterized by their broad reactivity mainly directed against very well conserved public epitopes. They fulfill the definition of an autoantibody since they are self-reactive, but they are not self-specific. As yet, NAA directed against determinants of polymorphism have not been reported. The presence of this repertoire in normal conditions challenges the clonal deletion theory as a unique explanation for self-tolerance. However, if we take into account that this autoreactive B-cell repertoire is not self-specific, this contradiction may not be a real one opposition. Indeed, the Lansteiner's rule that a subject belonging to group A will never produce anti-A antibodies and will always produce natural antibodies against the B-cell group, could never be challenged. Clonal deletion is probably accounting for this phenomenum. However, the serum of healthy adult individuals frequently exhibits low titers of anti-I antibodies, which is a precursor molecule of AB0 antigen system. The mechanism accounting for deletion of B cells directed against critical determinants like antigens A and B in the red blood cell system and allowing the production of autoantibodies against I remain elusive.
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Affiliation(s)
- Pablo Oppezzo
- Unité d'Immuno-Hématologie et d'Immunopathologie, Institut Pasteur, 28, rue du Dr Roux, 75724 Paris, France
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48
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Payelle-Brogard B, Magnac C, Oppezzo P, Dumas G, Dighiero G, Vuillier F. Retention and defective assembly of the B-cell receptor in the endoplasmic reticulum of chronic lymphocytic leukaemia B cells cannot be reverted upon CD40 ligand stimulation. Leukemia 2003; 17:1196-9. [PMID: 12764393 DOI: 10.1038/sj.leu.2402944] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
MESH Headings
- Antigens, CD/genetics
- Antigens, CD/metabolism
- B-Lymphocytes/metabolism
- B-Lymphocytes/pathology
- B7-1 Antigen/metabolism
- B7-2 Antigen
- CD40 Ligand/genetics
- CD40 Ligand/metabolism
- CD79 Antigens
- Case-Control Studies
- Endoplasmic Reticulum/metabolism
- Gene Expression Regulation, Leukemic
- Humans
- Immunoglobulin M/metabolism
- Leukemia, Lymphocytic, Chronic, B-Cell/complications
- Leukemia, Lymphocytic, Chronic, B-Cell/genetics
- Lymphocyte Activation
- Membrane Glycoproteins/metabolism
- Receptors, Antigen, B-Cell/metabolism
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49
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Oppezzo P, Vuillier F, Vasconcelos Y, Dumas G, Magnac C, Payelle-Brogard B, Pritsch O, Dighiero G. Chronic lymphocytic leukemia B cells expressing AID display dissociation between class switch recombination and somatic hypermutation. Blood 2003; 101:4029-32. [PMID: 12521993 DOI: 10.1182/blood-2002-10-3175] [Citation(s) in RCA: 94] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
In B cells, somatic hypermutation (SHM) and class switch recombination (CSR) depend on the activation-induced cytidine deaminase (AID) gene product, although the precise mode of action of AID remains unknown. Because some chronic lymphocytic leukemia (CLL) B cells can undergo CSR without SHM, it constitutes a useful model to dissect AID function. In this work, we have studied AID expression, the presence of mutations in the preswitch mu DNA region, CSR, and the SHM in 65 CLL patients. Our results demonstrate that unmutated CLL B cells can constitutively express AID and that AID expression is associated with the presence of mutations in the preswitch region and in clonally related isotype-switched transcripts. They also demonstrate that in CLL without constitutive AID expression, AID induction on stimulation results in preswitch mutations and the CSR process. Our results show a dissociation between SHM and CSR in CLL and suggest that, in this disease, AID would require additional help for carrying out the SHM process.
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MESH Headings
- B-Lymphocytes/immunology
- Base Sequence
- Cytidine Deaminase/blood
- Cytidine Deaminase/genetics
- DNA Primers
- Humans
- Leukemia, Lymphocytic, Chronic, B-Cell/enzymology
- Leukemia, Lymphocytic, Chronic, B-Cell/genetics
- Leukemia, Lymphocytic, Chronic, B-Cell/immunology
- Mutation
- Polymerase Chain Reaction
- RNA Editing/immunology
- Recombination, Genetic
- Reference Values
- Transcription, Genetic
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Affiliation(s)
- Pablo Oppezzo
- Unité d'Immuno-hématologie et d'Immunopathologie, Institut Pasteur, Paris, France
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50
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Vuillier F, Maloum K, Thomas EK, Magnac C, Dumas G, Payelle-Brogard B, Oppezzo P, Dighiero G, Scott-Algara D. Idiotype-pulsed dendritic cells are able to induce antitumoral cytotoxic CD8 cells in chronic lymphocytic leukaemia. Br J Haematol 2003; 120:243-50. [PMID: 12542481 DOI: 10.1046/j.1365-2141.2003.04075.x] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Idiotypic structures of immunoglobulins from malignant B cells constitute tumour-specific antigens, though the function of immunoglobulin-specific CD8+ T cells in disease control and rejection remains unclear. We have studied five cases of B chronic lymphocytic leukaemia patients affected with indolent (three patients) or aggressive (two patients) disease. We showed that CD8+ T cells with major histocompatibility complex class I-restricted cytotoxicity against autologous tumour B cells could be generated following repeated stimulations with idiotype-pulsed dendritic cells in vitro. CD8+ T-cell lines were able to upregulate CD69 expression and to release interferon (IFN)-gamma upon contact with the autologous B cells, though cytolytic activity was only substantiated for patients with indolent disease. The failure of cytolytic activity in patients with aggressive disease may be explained by a skewed maturation of memory CD8 cells.
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MESH Headings
- Antigens, CD/immunology
- Antigens, Differentiation, T-Lymphocyte/immunology
- B-Lymphocytes/immunology
- CD8 Antigens/immunology
- Dendritic Cells/immunology
- Histocompatibility Antigens Class I
- Humans
- Immunoglobulin M/administration & dosage
- Immunoglobulin M/immunology
- Immunologic Memory
- Immunotherapy, Adoptive/methods
- Interferon-gamma/immunology
- Lectins, C-Type
- Leukemia, Lymphocytic, Chronic, B-Cell/immunology
- Leukemia, Lymphocytic, Chronic, B-Cell/therapy
- Lymphocyte Activation
- T-Lymphocytes, Cytotoxic/immunology
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Affiliation(s)
- Françoise Vuillier
- Unité d'Immuno-Hématologie et d'Immunopathologie, Institut Pasteur, Paris, France.
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