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Hoferkova E, Seda V, Kadakova S, Verner J, Loja T, Matulova K, Skuhrova Francova H, Ondrouskova E, Filip D, Blavet N, Boudny M, Mladonicka Pavlasova G, Vecera J, Ondrisova L, Pavelkova P, Hlavac K, Kostalova L, Michaelou A, Pospisilova S, Dorazilova J, Chochola V, Jaros J, Doubek M, Jarosova M, Hampl A, Vojtova L, Kren L, Mayer J, Mraz M. Stromal cells engineered to express T cell factors induce robust CLL cell proliferation in vitro and in PDX co-transplantations allowing the identification of RAF inhibitors as anti-proliferative drugs. Leukemia 2024:10.1038/s41375-024-02284-w. [PMID: 38877102 DOI: 10.1038/s41375-024-02284-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2024] [Revised: 05/03/2024] [Accepted: 05/09/2024] [Indexed: 06/16/2024]
Abstract
Several in vitro models have been developed to mimic chronic lymphocytic leukemia (CLL) proliferation in immune niches; however, they typically do not induce robust proliferation. We prepared a novel model based on mimicking T-cell signals in vitro and in patient-derived xenografts (PDXs). Six supportive cell lines were prepared by engineering HS5 stromal cells with stable expression of human CD40L, IL4, IL21, and their combinations. Co-culture with HS5 expressing CD40L and IL4 in combination led to mild CLL cell proliferation (median 7% at day 7), while the HS5 expressing CD40L, IL4, and IL21 led to unprecedented proliferation rate (median 44%). The co-cultures mimicked the gene expression fingerprint of lymph node CLL cells (MYC, NFκB, and E2F signatures) and revealed novel vulnerabilities in CLL-T-cell-induced proliferation. Drug testing in co-cultures revealed for the first time that pan-RAF inhibitors fully block CLL proliferation. The co-culture model can be downscaled to five microliter volume for large drug screening purposes or upscaled to CLL PDXs by HS5-CD40L-IL4 ± IL21 co-transplantation. Co-transplanting NSG mice with purified CLL cells and HS5-CD40L-IL4 or HS5-CD40L-IL4-IL21 cells on collagen-based scaffold led to 47% or 82% engraftment efficacy, respectively, with ~20% of PDXs being clonally related to CLL, potentially overcoming the need to co-transplant autologous T-cells in PDXs.
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Affiliation(s)
- Eva Hoferkova
- Central European Institute of Technology, Masaryk University, Brno, Czech Republic
- Department of Internal Medicine, Hematology and Oncology, University Hospital Brno and Faculty of Medicine, Masaryk University, Brno, Czech Republic
- Faculty of Science, Masaryk University, Brno, Czech Republic
| | - Vaclav Seda
- Central European Institute of Technology, Masaryk University, Brno, Czech Republic
- Department of Internal Medicine, Hematology and Oncology, University Hospital Brno and Faculty of Medicine, Masaryk University, Brno, Czech Republic
| | - Sona Kadakova
- Central European Institute of Technology, Masaryk University, Brno, Czech Republic
| | - Jan Verner
- Department of Internal Medicine, Hematology and Oncology, University Hospital Brno and Faculty of Medicine, Masaryk University, Brno, Czech Republic
| | - Tomas Loja
- Central European Institute of Technology, Masaryk University, Brno, Czech Republic
| | - Kvetoslava Matulova
- Department of Pathology, University Hospital Brno and Faculty of Medicine, Masaryk University, Brno, Czech Republic
| | - Hana Skuhrova Francova
- Department of Internal Medicine, Hematology and Oncology, University Hospital Brno and Faculty of Medicine, Masaryk University, Brno, Czech Republic
| | - Eva Ondrouskova
- Department of Internal Medicine, Hematology and Oncology, University Hospital Brno and Faculty of Medicine, Masaryk University, Brno, Czech Republic
| | - Daniel Filip
- Central European Institute of Technology, Masaryk University, Brno, Czech Republic
- Department of Internal Medicine, Hematology and Oncology, University Hospital Brno and Faculty of Medicine, Masaryk University, Brno, Czech Republic
| | - Nicolas Blavet
- Central European Institute of Technology, Masaryk University, Brno, Czech Republic
| | - Miroslav Boudny
- Central European Institute of Technology, Masaryk University, Brno, Czech Republic
- Department of Internal Medicine, Hematology and Oncology, University Hospital Brno and Faculty of Medicine, Masaryk University, Brno, Czech Republic
| | | | - Josef Vecera
- Central European Institute of Technology, Masaryk University, Brno, Czech Republic
| | - Laura Ondrisova
- Central European Institute of Technology, Masaryk University, Brno, Czech Republic
- Department of Internal Medicine, Hematology and Oncology, University Hospital Brno and Faculty of Medicine, Masaryk University, Brno, Czech Republic
| | - Petra Pavelkova
- Central European Institute of Technology, Masaryk University, Brno, Czech Republic
| | - Krystof Hlavac
- Central European Institute of Technology, Masaryk University, Brno, Czech Republic
- Department of Internal Medicine, Hematology and Oncology, University Hospital Brno and Faculty of Medicine, Masaryk University, Brno, Czech Republic
| | - Lenka Kostalova
- Central European Institute of Technology, Masaryk University, Brno, Czech Republic
- Department of Internal Medicine, Hematology and Oncology, University Hospital Brno and Faculty of Medicine, Masaryk University, Brno, Czech Republic
| | - Androniki Michaelou
- Central European Institute of Technology, Masaryk University, Brno, Czech Republic
- Faculty of Science, Masaryk University, Brno, Czech Republic
| | - Sarka Pospisilova
- Department of Internal Medicine, Hematology and Oncology, University Hospital Brno and Faculty of Medicine, Masaryk University, Brno, Czech Republic
| | - Jana Dorazilova
- Central European Institute of Technology, Brno University of Technology, Brno, Czech Republic
| | - Vaclav Chochola
- Department of Histology and Embryology, Faculty of Medicine, Masaryk University, Brno, Czech Republic
| | - Josef Jaros
- Department of Histology and Embryology, Faculty of Medicine, Masaryk University, Brno, Czech Republic
| | - Michael Doubek
- Department of Internal Medicine, Hematology and Oncology, University Hospital Brno and Faculty of Medicine, Masaryk University, Brno, Czech Republic
| | - Marie Jarosova
- Department of Internal Medicine, Hematology and Oncology, University Hospital Brno and Faculty of Medicine, Masaryk University, Brno, Czech Republic
| | - Ales Hampl
- Department of Histology and Embryology, Faculty of Medicine, Masaryk University, Brno, Czech Republic
| | - Lucy Vojtova
- Central European Institute of Technology, Brno University of Technology, Brno, Czech Republic
| | - Leos Kren
- Department of Pathology, University Hospital Brno and Faculty of Medicine, Masaryk University, Brno, Czech Republic
| | - Jiri Mayer
- Department of Internal Medicine, Hematology and Oncology, University Hospital Brno and Faculty of Medicine, Masaryk University, Brno, Czech Republic
| | - Marek Mraz
- Central European Institute of Technology, Masaryk University, Brno, Czech Republic.
- Department of Internal Medicine, Hematology and Oncology, University Hospital Brno and Faculty of Medicine, Masaryk University, Brno, Czech Republic.
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Li T, Cai Y, Li C, Huang J, Chen J, Zhang Z, Cao R, Zhou B, Feng X. MDA5 with Complete CARD2 Region Inhibits the Early Replication of H9N2 AIV and Enhances the Immune Response during Vaccination. Vaccines (Basel) 2023; 11:1542. [PMID: 37896944 PMCID: PMC10611263 DOI: 10.3390/vaccines11101542] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2023] [Revised: 09/22/2023] [Accepted: 09/27/2023] [Indexed: 10/29/2023] Open
Abstract
Chicken melanoma differentiation-associated gene 5 (MDA5) is a member of the RLRs family that recognizes the viral RNAs invading cells and activates downstream interferon regulatory pathways, thereby inhibiting viral replication. The caspase activation and recruitment domain (CARD) is the most important region in MDA5 protein. However, the antiviral and immune enhancement of MDA5 with the CARD region remains unclear. In this study, two truncated MDA5 genes with different CARD regions, namely MDA5-1 with CARD1 plus partial CARD2 domain and MDA5-2 with CARD1 plus complete CARD2 domain, were cloned via reverse transcription PCR and ligated into plasmid Flag-N vector to be Flag-MDA5-1 and Flag-MDA5-2 plasmids. DF-1 cells were transfected with two plasmids for 24 h and then inoculated with H9N2 virus (0.1 MOI) for 6 h to detect the levels of IFN-β, PKR, MAVS, and viral HA, NA, and NS proteins expression. The results showed that MDA5-1 and MDA5-2 increased the expression of IFN-β and PKR, activated the downstream molecule MAVS production, and inhibited the expression of HA, NA, and NS proteins. The knockdown of MDA5 genes confirmed that MDA5-2 had a stronger antiviral effect than that of MDA5-1. Furthermore, the recombinant proteins MDA5-1 and MDA5-2 were combined with H9N2 inactivated vaccine to immunize SPF chickens subcutaneously injected in the neck three times. The immune response of the immunized chicken was investigated. It was observed that the antibody titers and expressions of immune-related molecules from the chicken immunized with MDA5-1 and MDA5-2 group were increased, in which the inducing function of MDA5-2 groups was the highest among all immunization groups. These results suggested that the truncated MDA5 recombinant proteins with complete CARD2 region could play vital roles in antiviral and immune enhancement. This study provides important material for the further study of the immunoregulatory function and clinical applications of MDA5 protein.
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Affiliation(s)
- Tongtong Li
- Key Laboratory of Animal Microbiology of China’s Ministry of Agriculture, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, China; (T.L.); (Y.C.); (C.L.); (J.H.); (J.C.); (Z.Z.); (R.C.); (B.Z.)
- MOE Joint International Research Laboratory of Animal Health and Food Safety, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, China
| | - Yiqin Cai
- Key Laboratory of Animal Microbiology of China’s Ministry of Agriculture, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, China; (T.L.); (Y.C.); (C.L.); (J.H.); (J.C.); (Z.Z.); (R.C.); (B.Z.)
- MOE Joint International Research Laboratory of Animal Health and Food Safety, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, China
| | - Chenfei Li
- Key Laboratory of Animal Microbiology of China’s Ministry of Agriculture, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, China; (T.L.); (Y.C.); (C.L.); (J.H.); (J.C.); (Z.Z.); (R.C.); (B.Z.)
- MOE Joint International Research Laboratory of Animal Health and Food Safety, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, China
| | - Jingwen Huang
- Key Laboratory of Animal Microbiology of China’s Ministry of Agriculture, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, China; (T.L.); (Y.C.); (C.L.); (J.H.); (J.C.); (Z.Z.); (R.C.); (B.Z.)
- MOE Joint International Research Laboratory of Animal Health and Food Safety, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, China
| | - Jiajing Chen
- Key Laboratory of Animal Microbiology of China’s Ministry of Agriculture, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, China; (T.L.); (Y.C.); (C.L.); (J.H.); (J.C.); (Z.Z.); (R.C.); (B.Z.)
- MOE Joint International Research Laboratory of Animal Health and Food Safety, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, China
| | - Ze Zhang
- Key Laboratory of Animal Microbiology of China’s Ministry of Agriculture, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, China; (T.L.); (Y.C.); (C.L.); (J.H.); (J.C.); (Z.Z.); (R.C.); (B.Z.)
- MOE Joint International Research Laboratory of Animal Health and Food Safety, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, China
| | - Ruibing Cao
- Key Laboratory of Animal Microbiology of China’s Ministry of Agriculture, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, China; (T.L.); (Y.C.); (C.L.); (J.H.); (J.C.); (Z.Z.); (R.C.); (B.Z.)
- MOE Joint International Research Laboratory of Animal Health and Food Safety, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, China
| | - Bin Zhou
- Key Laboratory of Animal Microbiology of China’s Ministry of Agriculture, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, China; (T.L.); (Y.C.); (C.L.); (J.H.); (J.C.); (Z.Z.); (R.C.); (B.Z.)
- MOE Joint International Research Laboratory of Animal Health and Food Safety, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, China
| | - Xiuli Feng
- Key Laboratory of Animal Microbiology of China’s Ministry of Agriculture, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, China; (T.L.); (Y.C.); (C.L.); (J.H.); (J.C.); (Z.Z.); (R.C.); (B.Z.)
- MOE Joint International Research Laboratory of Animal Health and Food Safety, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, China
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Helm M, Huang SB, Gollner K, Gollner U, Jérôme V, Freitag R. Cultivation of Encapsulated Primary Human B Lymphocytes: A First Step toward a Bioartificial Germinal Center. Macromol Biosci 2023; 23:e2200256. [PMID: 36205699 DOI: 10.1002/mabi.202200256] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2022] [Revised: 09/22/2022] [Indexed: 01/19/2023]
Abstract
Polyelectrolyte microcapsules based on sodium cellulose sulfate (SCS) and poly-diallyl-dimethyl-ammonium chloride (PDADMAC) have previously been proposed as a suitable ex vivo microenvironment for the cultivation and differentiation of primary human T lymphocytes. Here, the same system is investigated for the cultivation of human primary B cells derived from adult tonsillar tissue. Proliferation and differentiation into subtypes are followed and compared to suspension cultures of B cells from the same pool performed in parallel. Total cell expansion is somewhat lower in the capsules than in the suspension cultures. More importantly, however, the differentiation of the initially mainly memory B cells into various subtypes, in particular into plasma cell (PC), shows significant differences. Clearly, the microenvironment provided by the microcapsules is beneficial for an accelerated induction of a germinal center-like B cell phenotype and afterward supports the long-term survival of the PC cells. Then, varying the encapsulation conditions (i.e., presence of human serum and dedicated cytokines in the capsule core) provides a tool for finetuning the B cell response. Hence, this methodology is suggested to pave the way toward ex vivo development of human immune organoids.
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Affiliation(s)
- Moritz Helm
- Process Biotechnology, University of Bayreuth, 95447, Bayreuth, Germany
| | - Songyan B Huang
- Process Biotechnology, University of Bayreuth, 95447, Bayreuth, Germany
| | - Katrin Gollner
- Praxis am Schießgraben, Schießgraben 21, 95326, Kulmbach, Germany
| | - Ulrich Gollner
- Praxis am Schießgraben, Schießgraben 21, 95326, Kulmbach, Germany
| | - Valérie Jérôme
- Process Biotechnology, University of Bayreuth, 95447, Bayreuth, Germany
| | - Ruth Freitag
- Process Biotechnology, University of Bayreuth, 95447, Bayreuth, Germany
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In Vitro and In Vivo Models of CLL–T Cell Interactions: Implications for Drug Testing. Cancers (Basel) 2022; 14:cancers14133087. [PMID: 35804862 PMCID: PMC9264798 DOI: 10.3390/cancers14133087] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2022] [Revised: 06/17/2022] [Accepted: 06/19/2022] [Indexed: 11/17/2022] Open
Abstract
Simple Summary Chronic lymphocytic leukemia (CLL) cells in the peripheral blood and lymphoid microenvironment display substantially different gene expression profiles and proliferative capaci-ty. It has been suggested that CLL–T-cell interactions are key pro-proliferative stimuli in immune niches. We review in vitro and in vivo model systems that mimic CLL-T-cell interactions to trigger CLL proliferation and study therapy resistance. We focus on studies describing the co-culture of leukemic cells with T cells, or supportive cell lines expressing T-cell factors, and simplified models of CLL cells’ stimulation with recombinant factors. In the second part, we summarize mouse models revealing the role of T cells in CLL biology and implications for generating patient-derived xenografts by co-transplanting leukemic cells with T cells. Abstract T cells are key components in environments that support chronic lymphocytic leukemia (CLL), activating CLL-cell proliferation and survival. Here, we review in vitro and in vivo model systems that mimic CLL–T-cell interactions, since these are critical for CLL-cell division and resistance to some types of therapy (such as DNA-damaging drugs or BH3-mimetic venetoclax). We discuss approaches for direct CLL-cell co-culture with autologous T cells, models utilizing supportive cell lines engineered to express T-cell factors (such as CD40L) or stimulating CLL cells with combinations of recombinant factors (CD40L, interleukins IL4 or IL21, INFγ) and additional B-cell receptor (BCR) activation with anti-IgM antibody. We also summarize strategies for CLL co-transplantation with autologous T cells into immunodeficient mice (NOD/SCID, NSG, NOG) to generate patient-derived xenografts (PDX) and the role of T cells in transgenic CLL mouse models based on TCL1 overexpression (Eµ-TCL1). We further discuss how these in vitro and in vivo models could be used to test drugs to uncover the effects of targeted therapies (such as inhibitors of BTK, PI3K, SYK, AKT, MEK, CDKs, BCL2, and proteasome) or chemotherapy (fludarabine and bendamustine) on CLL–T-cell interactions and CLL proliferation.
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Ex vivo-expanded human CD19 +TIM-1 + regulatory B cells suppress immune responses in vivo and are dependent upon the TIM-1/STAT3 axis. Nat Commun 2022; 13:3121. [PMID: 35660734 PMCID: PMC9166804 DOI: 10.1038/s41467-022-30613-z] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2017] [Accepted: 05/05/2022] [Indexed: 02/07/2023] Open
Abstract
Regulatory B cells (Breg) are a heterogenous population with immune-modulating functions. The rarity of human IL-10+ Breg makes translational studies difficult. Here we report ex vivo expansion of human B cells with in vivo regulatory function (expBreg). CD154-stimulation of human CD19+ B cells drives >900-fold expansion of IL-10+ B cells that is maintained in culture for 14 days. Whilst expBreg-mediated suppressive function is partially dependent on IL-10 expression, CRISPR-mediated gene deletions demonstrate predominant roles for TIM-1 and CD154. TIM-1 regulates STAT3 signalling and modulates downstream suppressive function. In a clinically relevant humanised mouse model of skin transplantation, expBreg prolongs human allograft survival. Meanwhile, CD19+CD73-CD25+CD71+TIM-1+CD154+ Breg cells are enriched in the peripheral blood of human donors with cutaneous squamous cell carcinoma (SCC). TIM-1+ and pSTAT3+ B cells are also identified in B cell clusters within histological sections of human cutaneous SCC tumours. Our findings thus provide insights on Breg homoeostasis and present possible targets for Breg-related therapies.
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CD40-CD154: A perspective from type 2 immunity. Semin Immunol 2021; 53:101528. [PMID: 34810089 DOI: 10.1016/j.smim.2021.101528] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/20/2021] [Revised: 11/08/2021] [Accepted: 11/10/2021] [Indexed: 12/19/2022]
Abstract
The interaction between CD40 and CD154 (CD40 ligand) is central in immunology, participating in CD4+ T cell priming by dendritic cells (DC), CD4+ T cell help to B cells and classical macrophage activation by CD4+ T cells. However, its role in the Th2 side of immunology including helminth infection remains incompletely understood. Contrary to viral and bacterial stimuli, helminth products usually do not cause CD40 up-regulation in DC, and exogenous CD40 ligation drives Th2-biased systems towards Th1. On the other hand, CD40 and CD154 are necessary for induction of most Th2 responses. We attempt to reconcile these observations, mainly by proposing that (i) CD40 up-regulation in DC in Th2 systems is mostly induced by alarmins, (ii) the Th2 to Th1 shift induced by exogenous CD40 ligation is related to the capacity of such ligation to enhance IL-12 production by myeloid cells, and (iii) signals elicited by endogenous CD154 available in Th2 contexts and by exogenous CD40 ligation are probably different. We stress that CD40-CD154 is important beyond cognate cellular interactions. In such a context, we argue that the proliferation response of B-cells to IL-4 plus CD154 reflects a Th2-specific mechanism for polyclonal B-cell amplification and IgE production at infection sites. Finally, we argue that CD154 is a general immune activation signal across immune polarization including Th2, and propose that competition for CD154 at tissue sites may provide negative feedback on response induction at each site.
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Possamaï D, Pagé G, Panès R, Gagnon É, Lapointe R. CD40L-Stimulated B Lymphocytes Are Polarized toward APC Functions after Exposure to IL-4 and IL-21. THE JOURNAL OF IMMUNOLOGY 2021; 207:77-89. [PMID: 34135061 DOI: 10.4049/jimmunol.2001173] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/16/2020] [Accepted: 04/26/2021] [Indexed: 01/25/2023]
Abstract
B lymphocytes have multiple functions central to humoral immunity, including Ag presentation to T cells, cytokine secretion, and differentiation into Ab-secreting plasma cells. In vitro expansion of human B cells by continuous IL-4 stimulation and engagement of their CD40 receptor by CD40L has allowed the use of these IL-4-CD40-B cells in research for the induction of Ag-specific T cell immune responses. However, in vivo, follicular helper T cells also influence B cell activity through the secretion of IL-21. The impact of both cytokines on multiple B cell functions is not clearly defined. To further understand these cytokines in CD40-B cell biology, we stimulated CD40-B cells with IL-4 or IL-21 or both (Combo) and characterized the proliferation, subsets, and functions of these cells. We demonstrate that IL-21- and Combo-CD40-B cells are highly proliferative cells that can be rapidly expanded to high numbers. We show that IL-21-CD40-B cells polarize to Ab-secreting plasma cells, whereas IL-4- and Combo-CD40-B cells are mostly activated mature B cells that express molecules associated with favorable APC functions. We further demonstrate that both IL-4- and Combo-CD40-B cells are efficient in promoting T cell activation and proliferation compared with IL-21-CD40-B cells. Thus, our study provides a better appreciation of CD40-B cell plasticity and biology. In addition, the stimulation of B cells with CD40L, IL-4, and IL-21 allows for the fast generation of high numbers of efficient APC, therefore providing a prospective tool for research and clinical applications such as cancer immunotherapy.
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Affiliation(s)
- David Possamaï
- Axe Cancer, Centre de Recherche du Centre Hospitalier de l'Université de Montréal, Montréal, Québec, Canada.,Faculté de Médecine, Département de Médecine, Université de Montréal, Montréal, Québec, Canada
| | - Gabriel Pagé
- Axe Cancer, Centre de Recherche du Centre Hospitalier de l'Université de Montréal, Montréal, Québec, Canada.,Faculté de Médecine, Département de Médecine, Université de Montréal, Montréal, Québec, Canada
| | - Rébecca Panès
- Axe de Recherche en Immunobiologie du Cancer, Institut de Recherche en Immunologie et Cancérologie, Montréal, Québec, Canada; and.,Faculté de Médecine, Département de Microbiologie, Infectiologie et Immunologie, Université de Montréal, Montréal, Québec, Canada
| | - Étienne Gagnon
- Axe de Recherche en Immunobiologie du Cancer, Institut de Recherche en Immunologie et Cancérologie, Montréal, Québec, Canada; and.,Faculté de Médecine, Département de Microbiologie, Infectiologie et Immunologie, Université de Montréal, Montréal, Québec, Canada
| | - Réjean Lapointe
- Axe Cancer, Centre de Recherche du Centre Hospitalier de l'Université de Montréal, Montréal, Québec, Canada; .,Faculté de Médecine, Département de Médecine, Université de Montréal, Montréal, Québec, Canada
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Haselager MV, Kater AP, Eldering E. Proliferative Signals in Chronic Lymphocytic Leukemia; What Are We Missing? Front Oncol 2020; 10:592205. [PMID: 33134182 PMCID: PMC7578574 DOI: 10.3389/fonc.2020.592205] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2020] [Accepted: 09/18/2020] [Indexed: 12/23/2022] Open
Abstract
Chronic lymphocytic leukemia (CLL) cells cycle between lymphoid tissue sites where they actively proliferate, and the peripheral blood (PB) where they become quiescent. Strong evidence exists for a crucial role of B cell receptor (BCR) triggering, either by (self-)antigen or by receptor auto-engagement in the lymph node (LN) to drive CLL proliferation and provide adhesion. The clinical success of Bruton's tyrosine kinase (BTK) inhibitors is widely accepted to be based on blockade of the BCR signal. Additional signals in the LN that support CLL survival derive from surrounding cells, such as CD40L-presenting T helper cells, myeloid and stromal cells. It is not quite clear if and to what extent these non-BCR signals contribute to proliferation in situ. In vitro BCR triggering, in contrast, leads to low-level activation and does not result in cell division. Various combinations of non-BCR signals delivered via co-stimulatory receptors, Toll-like receptors (TLRs), and/or soluble cytokines are applied, leading to comparatively modest and short-lived CLL proliferation in vitro. Thus, an unresolved gap exists between the condition in the patient as we now understand it and applicable knowledge that can be harnessed in the laboratory for future therapeutic applications. Even in this era of targeted drugs, CLL remains largely incurable with frequent relapses and emergence of resistance. Therefore, we require better insight into all aspects of CLL growth and potential rewiring of signaling pathways. We aim here to provide an overview of in vivo versus in vitro signals involved in CLL proliferation, point out areas of missing knowledge and suggest future directions for research.
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Affiliation(s)
- Marco V. Haselager
- Department of Experimental Immunology, Academic University Medical Center, location Academic Medical Center, University of Amsterdam, Amsterdam, Netherlands
- Lymphoma and Myeloma Center Amsterdam, LYMMCARE, Amsterdam, Netherlands
- Cancer Center Amsterdam, LYMMCARE, Amsterdam, Netherlands
- Amsterdam Infection & Immunity Institute, Amsterdam, Netherlands
| | - Arnon P. Kater
- Cancer Center Amsterdam, LYMMCARE, Amsterdam, Netherlands
- Amsterdam Infection & Immunity Institute, Amsterdam, Netherlands
- Department of Hematology, Academic University Medical Center, location Academic Medical Center, University of Amsterdam, Amsterdam, Netherlands
| | - Eric Eldering
- Department of Experimental Immunology, Academic University Medical Center, location Academic Medical Center, University of Amsterdam, Amsterdam, Netherlands
- Lymphoma and Myeloma Center Amsterdam, LYMMCARE, Amsterdam, Netherlands
- Cancer Center Amsterdam, LYMMCARE, Amsterdam, Netherlands
- Amsterdam Infection & Immunity Institute, Amsterdam, Netherlands
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Wennhold K, Shimabukuro-Vornhagen A, von Bergwelt-Baildon M. B Cell-Based Cancer Immunotherapy. Transfus Med Hemother 2019; 46:36-46. [PMID: 31244580 PMCID: PMC6558332 DOI: 10.1159/000496166] [Citation(s) in RCA: 70] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2018] [Accepted: 12/10/2018] [Indexed: 12/13/2022] Open
Abstract
B cells are not only producers of antibodies, but also contribute to immune regulation or act as potent antigen-presenting cells. The potential of B cells for cellular therapy is still largely underestimated, despite their multiple diverse effector functions. The CD40L/CD40 signaling pathway is the most potent activator of antigen presentation capacity in B lymphocytes. CD40-activated B cells are potent antigen-presenting cells that induce specific T-cell responses in vitro and in vivo. In preclinical cancer models in mice and dogs, CD40-activated B cell-based cancer immunotherapy was able to induce effective antitumor immunity. So far, there have been only few early-stage clinical studies involving B cell-based cancer vaccines. These trials indicate that B cell-based immunotherapy is generally safe and associated with little toxicity. Furthermore, these studies suggest that B-cell immunotherapy can elicit antitumor T-cell responses. Alongside the recent advances in cellular therapies in general, major obstacles for generation of good manufacturing practice-manufactured B-cell immunotherapies have been overcome. Thus, a first clinical trial involving CD40-activated B cells might be in reach.
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Affiliation(s)
- Kerstin Wennhold
- Center for Molecular Medicine Cologne, University of Cologne, Cologne, Germany
| | | | - Michael von Bergwelt-Baildon
- Center for Molecular Medicine Cologne, University of Cologne, Cologne, Germany
- Department of Medicine III, University Hospital, LMU Munich, Munich, Germany
- German Cancer Consortium (DKTK), Heidelberg, Germany
- Gene Center Munich, LMU Munich, Munich, Germany
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10
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Darwiche W, Gubler B, Marolleau JP, Ghamlouch H. Chronic Lymphocytic Leukemia B-Cell Normal Cellular Counterpart: Clues From a Functional Perspective. Front Immunol 2018; 9:683. [PMID: 29670635 PMCID: PMC5893869 DOI: 10.3389/fimmu.2018.00683] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2017] [Accepted: 03/20/2018] [Indexed: 12/20/2022] Open
Abstract
Chronic lymphocytic leukemia (CLL) is characterized by the clonal expansion of small mature-looking CD19+ CD23+ CD5+ B-cells that accumulate in the blood, bone marrow, and lymphoid organs. To date, no consensus has been reached concerning the normal cellular counterpart of CLL B-cells and several B-cell types have been proposed. CLL B-cells have remarkable phenotypic and gene expression profile homogeneity. In recent years, the molecular and cellular biology of CLL has been enriched by seminal insights that are leading to a better understanding of the natural history of the disease. Immunophenotypic and molecular approaches (including immunoglobulin heavy-chain variable gene mutational status, transcriptional and epigenetic profiling) comparing the normal B-cell subset and CLL B-cells provide some new insights into the normal cellular counterpart. Functional characteristics (including activation requirements and propensity for plasma cell differentiation) of CLL B-cells have now been investigated for 50 years. B-cell subsets differ substantially in terms of their functional features. Analysis of shared functional characteristics may reveal similarities between normal B-cell subsets and CLL B-cells, allowing speculative assignment of a normal cellular counterpart for CLL B-cells. In this review, we summarize current data regarding peripheral B-cell differentiation and human B-cell subsets and suggest possibilities for a normal cellular counterpart based on the functional characteristics of CLL B-cells. However, a definitive normal cellular counterpart cannot be attributed on the basis of the available data. We discuss the functional characteristics required for a cell to be logically considered to be the normal counterpart of CLL B-cells.
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Affiliation(s)
- Walaa Darwiche
- EA 4666 Lymphocyte Normal - Pathologique et Cancers, HEMATIM, Université de Picardie Jules Verne, Amiens, France.,Laboratoire d'Hématologie, Centre Hospitalier Universitaire Amiens-Picardie, Amiens, France
| | - Brigitte Gubler
- EA 4666 Lymphocyte Normal - Pathologique et Cancers, HEMATIM, Université de Picardie Jules Verne, Amiens, France.,Laboratoire d'Oncobiologie Moléculaire, Centre Hospitalier Universitaire Amiens-Picardie, Amiens, France
| | - Jean-Pierre Marolleau
- EA 4666 Lymphocyte Normal - Pathologique et Cancers, HEMATIM, Université de Picardie Jules Verne, Amiens, France.,Service d'Hématologie Clinique et Thérapie cellulaire, Centre Hospitalier Universitaire Amiens-Picardie, Amiens, France
| | - Hussein Ghamlouch
- Institut National de la Santé et de la Recherche Médicale (INSERM) U1170, Gustave Roussy, Villejuif, France.,Institut Gustave Roussy, Villejuif, France.,Université Paris-Sud, Faculté de Médecine, Le Kremlin-Bicêtre, France
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11
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Yiwen Z, Shilin G, Yingshi C, Lishi S, Baohong L, Chao L, Linghua L, Ting P, Hui Z. Efficient generation of antigen-specific CTLs by the BAFF-activated human B Lymphocytes as APCs: a novel approach for immunotherapy. Oncotarget 2018; 7:77732-77748. [PMID: 27780916 PMCID: PMC5363617 DOI: 10.18632/oncotarget.12792] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2016] [Accepted: 10/14/2016] [Indexed: 02/07/2023] Open
Abstract
Efficient antigen presentation is indispensable for cytotoxic T lymphocyte (CTL)-mediated immunotherapy. B-lymphocytes propagated with CD40L have been developed as antigen-presenting cells (APCs), but this capacity needs further optimization. Here, we aimed to expand human B-lymphocytes on a large scale while maintaining their antigen-presenting ability by using both CD40L and B-cell activating factor (BAFF). The addition of BAFF enhanced the expansion efficiency and prolonged the culture time without causing apoptosis of the expanded B-cells. This method thus provided an almost unlimited source of cellular adjuvant to achieve sufficient expansion of CTLs in cases where several rounds of stimulation are required. We also showed that the addition of BAFF significantly enhanced the expression of major costimulatory molecules, CD80 and CD86. Subsequently, the antigen-presenting ability of the B-lymphocytes also increased. Consequently, these B-lymphocytes showed robust CTL responses to inhibit tumor growth after tumor-specific peptide pulses. A similar method induced potent antigen-specific CTL responses, which effectively eradicated human immunodeficiency virus type 1 (HIV-1) latency in CD4 T-lymphocytes isolated from patients receiving suppressive anti-retroviral therapy (ART). Together, our findings indicate that potent antigen-specific CTLs can be generated using BAFF-activated B-lymphocytes as APCs ex vivo. This approach can be applied for CTL-mediated immunotherapy in patients with cancers or chronic viral infections.
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Affiliation(s)
- Zhang Yiwen
- Institute of Human Virology, Sun Yat-sen University, Guangzhou, Guangdong, 510080, China.,Key Laboratory of Tropical Disease Control of Ministry of Education, Sun Yat-sen University, Guangzhou, Guangdong, 510080, China.,Guangdong Engineering Research Center for Antimicrobial Agent and Immunotechnology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, Guangdong, 510080, China
| | - Gao Shilin
- Institute of Human Virology, Sun Yat-sen University, Guangzhou, Guangdong, 510080, China.,Key Laboratory of Tropical Disease Control of Ministry of Education, Sun Yat-sen University, Guangzhou, Guangdong, 510080, China.,Guangdong Engineering Research Center for Antimicrobial Agent and Immunotechnology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, Guangdong, 510080, China
| | - Chen Yingshi
- Institute of Human Virology, Sun Yat-sen University, Guangzhou, Guangdong, 510080, China.,Key Laboratory of Tropical Disease Control of Ministry of Education, Sun Yat-sen University, Guangzhou, Guangdong, 510080, China.,Guangdong Engineering Research Center for Antimicrobial Agent and Immunotechnology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, Guangdong, 510080, China
| | - Su Lishi
- Institute of Human Virology, Sun Yat-sen University, Guangzhou, Guangdong, 510080, China.,Key Laboratory of Tropical Disease Control of Ministry of Education, Sun Yat-sen University, Guangzhou, Guangdong, 510080, China.,Guangdong Engineering Research Center for Antimicrobial Agent and Immunotechnology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, Guangdong, 510080, China
| | - Luo Baohong
- Institute of Human Virology, Sun Yat-sen University, Guangzhou, Guangdong, 510080, China.,Key Laboratory of Tropical Disease Control of Ministry of Education, Sun Yat-sen University, Guangzhou, Guangdong, 510080, China.,Guangdong Engineering Research Center for Antimicrobial Agent and Immunotechnology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, Guangdong, 510080, China
| | - Liu Chao
- Institute of Human Virology, Sun Yat-sen University, Guangzhou, Guangdong, 510080, China.,Key Laboratory of Tropical Disease Control of Ministry of Education, Sun Yat-sen University, Guangzhou, Guangdong, 510080, China.,Guangdong Engineering Research Center for Antimicrobial Agent and Immunotechnology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, Guangdong, 510080, China
| | - Li Linghua
- Department of Infectious Diseases, Guangzhou 8th People's Hospital, Guangzhou, Guangdong, 510080, China
| | - Pan Ting
- Institute of Human Virology, Sun Yat-sen University, Guangzhou, Guangdong, 510080, China.,Key Laboratory of Tropical Disease Control of Ministry of Education, Sun Yat-sen University, Guangzhou, Guangdong, 510080, China.,Guangdong Engineering Research Center for Antimicrobial Agent and Immunotechnology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, Guangdong, 510080, China
| | - Zhang Hui
- Institute of Human Virology, Sun Yat-sen University, Guangzhou, Guangdong, 510080, China.,Key Laboratory of Tropical Disease Control of Ministry of Education, Sun Yat-sen University, Guangzhou, Guangdong, 510080, China.,Guangdong Engineering Research Center for Antimicrobial Agent and Immunotechnology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, Guangdong, 510080, China
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12
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Marasco E, Farroni C, Cascioli S, Marcellini V, Scarsella M, Giorda E, Piano Mortari E, Leonardi L, Scarselli A, Valentini D, Cancrini C, Duse M, Grimsholm O, Carsetti R. B-cell activation with CD40L or CpG measures the function of B-cell subsets and identifies specific defects in immunodeficient patients. Eur J Immunol 2016; 47:131-143. [PMID: 27800605 DOI: 10.1002/eji.201646574] [Citation(s) in RCA: 43] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2016] [Revised: 10/10/2016] [Accepted: 10/28/2016] [Indexed: 01/19/2023]
Abstract
Around 65% of primary immunodeficiencies are antibody deficiencies. Functional tests are useful tools to study B-cell functions in vitro. However, no accepted guidelines for performing and evaluating functional tests have been issued yet. Here, we report our experience on the study of B-cell functions in infancy and throughout childhood. We show that T-independent stimulation with CpG measures proliferation and differentiation potential of memory B cells. Switched memory B cells respond better than IgM memory B cells. On the other hand, CD40L, a T-dependent stimulus, does not induce plasma cell differentiation, but causes proliferation of naïve and memory B cells. During childhood, the production of plasmablasts in response to CpG increases with age mirroring the development of memory B cells. The response to CD40L does not change with age. In patients with selective IgA deficiency (SIgAD), we observed that switched memory B cells are reduced due to the absence of IgA memory B cells. In agreement, IgA plasma cells are not generated in response to CpG. Unexpectedly, B cells from SIgAD patients show a reduced proliferative response to CD40L. Our results demonstrate that functional tests are an important tool to assess the functions of the humoral immune system.
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Affiliation(s)
- Emiliano Marasco
- Division of Rheumatology, Ospedale Pediatrico Bambino Gesù IRCCS, Roma, Italy
| | - Chiara Farroni
- B Cell Physiopathology Unit, Immunology Research Area, Ospedale Pediatrico Bambino Gesù IRCSS, Roma, Italy
| | - Simona Cascioli
- B Cell Physiopathology Unit, Immunology Research Area, Ospedale Pediatrico Bambino Gesù IRCSS, Roma, Italy
| | - Valentina Marcellini
- B Cell Physiopathology Unit, Immunology Research Area, Ospedale Pediatrico Bambino Gesù IRCSS, Roma, Italy
| | - Marco Scarsella
- B Cell Physiopathology Unit, Immunology Research Area, Ospedale Pediatrico Bambino Gesù IRCSS, Roma, Italy
| | - Ezio Giorda
- B Cell Physiopathology Unit, Immunology Research Area, Ospedale Pediatrico Bambino Gesù IRCSS, Roma, Italy
| | - Eva Piano Mortari
- B Cell Physiopathology Unit, Immunology Research Area, Ospedale Pediatrico Bambino Gesù IRCSS, Roma, Italy
| | - Lucia Leonardi
- Department of Pediatrics, La Sapienza University of Rome, Rome, Italy
| | - Alessia Scarselli
- University Department of Pediatrics, Unit of Immune and Infectious Diseases, Bambino Gesù Children's Hospital, University of Rome "Tor Vergata", Rome, Italy
| | - Diletta Valentini
- Pediatric and Infectious Disease Unit, Bambino Gesù Children's Hospital IRCCS, Rome, Italy
| | - Caterina Cancrini
- University Department of Pediatrics, Unit of Immune and Infectious Diseases, Bambino Gesù Children's Hospital, University of Rome "Tor Vergata", Rome, Italy
| | - Marzia Duse
- Department of Pediatrics, La Sapienza University of Rome, Rome, Italy
| | - Ola Grimsholm
- B Cell Physiopathology Unit, Immunology Research Area, Ospedale Pediatrico Bambino Gesù IRCSS, Roma, Italy.,Department of Rheumatology and Inflammation Research, University of Gothenburg, Gothenburg, Sweden
| | - Rita Carsetti
- B Cell Physiopathology Unit, Immunology Research Area, Ospedale Pediatrico Bambino Gesù IRCSS, Roma, Italy
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13
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Bone Marrow Mesenchymal Stem Cells Enhance the Differentiation of Human Switched Memory B Lymphocytes into Plasma Cells in Serum-Free Medium. J Immunol Res 2016; 2016:7801781. [PMID: 27872867 PMCID: PMC5107863 DOI: 10.1155/2016/7801781] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2016] [Revised: 08/31/2016] [Accepted: 09/04/2016] [Indexed: 12/21/2022] Open
Abstract
The differentiation of human B lymphocytes into plasma cells is one of the most stirring questions with regard to adaptive immunity. However, the terminal differentiation and survival of plasma cells are still topics with much to be discovered, especially when targeting switched memory B lymphocytes. Plasma cells can migrate to the bone marrow in response to a CXCL12 gradient and survive for several years while secreting antibodies. In this study, we aimed to get closer to niches favoring plasma cell survival. We tested low oxygen concentrations and coculture with mesenchymal stem cells (MSC) from human bone marrow. Besides, all cultures were performed using an animal protein-free medium. Overall, our model enables the generation of high proportions of CD38+CD138+CD31+ plasma cells (≥50%) when CD40-activated switched memory B lymphocytes were cultured in direct contact with mesenchymal stem cells. In these cultures, the secretion of CXCL12 and TGF-β, usually found in the bone marrow, was linked to the presence of MSC. The level of oxygen appeared less impactful than the contact with MSC. This study shows for the first time that expanded switched memory B lymphocytes can be differentiated into plasma cells using exclusively a serum-free medium.
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14
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Crassini K, Shen Y, Mulligan S, Giles Best O. Modeling the chronic lymphocytic leukemia microenvironment in vitro. Leuk Lymphoma 2016; 58:266-279. [PMID: 27756161 DOI: 10.1080/10428194.2016.1204654] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Microenvironments within the lymph node and bone marrow promote proliferation and drug resistance in chronic lymphocytic leukemia (CLL). Successful treatment of CLL must therefore target the leukemic cells within these compartments. A better understanding of the interaction between CLL cells and the tumor microenvironment has led to the development of in vitro models that mimic the mechanisms that support leukemic cell survival and proliferation in vivo. Employing these models as part of the pre-clinical evaluation of novel therapeutic agents enables a better approximation of their potential clinical efficacy. In this review we summarize the current literature describing how different aspects of the tumor microenvironment have been modeled in vitro and detail how these models have been employed to study the biology of the disease and potential efficacy of novel therapeutic agents.
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Affiliation(s)
- Kyle Crassini
- a Northern Blood Research Centre , Kolling Institute of Medical Research, Royal North Shore Hospital , Sydney , Australia
| | - Yandong Shen
- a Northern Blood Research Centre , Kolling Institute of Medical Research, Royal North Shore Hospital , Sydney , Australia
| | - Stephen Mulligan
- a Northern Blood Research Centre , Kolling Institute of Medical Research, Royal North Shore Hospital , Sydney , Australia.,b Chronic Lymphocytic Leukemia Research Consortium (CLLARC) , Australia
| | - O Giles Best
- a Northern Blood Research Centre , Kolling Institute of Medical Research, Royal North Shore Hospital , Sydney , Australia.,b Chronic Lymphocytic Leukemia Research Consortium (CLLARC) , Australia
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15
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Zambrano K, Jérôme V, Freitag R, Buchholz R, Jäck HM, Hübner H, Schuh W. Prolonged Ex vivo expansion and differentiation of naïve murine CD43−B splenocytes. Biotechnol Prog 2016; 32:978-89. [DOI: 10.1002/btpr.2265] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2015] [Revised: 03/10/2016] [Indexed: 02/06/2023]
Affiliation(s)
- Kenny Zambrano
- Institute of Bioprocess Engineering, Friedrich-Alexander-University Erlangen Nürnberg; Paul-Gordan-Straße 3 Erlangen D-91054 Germany
| | - Valérie Jérôme
- Chair for Process Biotechnology; University of Bayreuth; Universitätsstraße 30 Bayreuth D-95447 Germany
| | - Ruth Freitag
- Chair for Process Biotechnology; University of Bayreuth; Universitätsstraße 30 Bayreuth D-95447 Germany
| | - Rainer Buchholz
- Institute of Bioprocess Engineering, Friedrich-Alexander-University Erlangen Nürnberg; Paul-Gordan-Straße 3 Erlangen D-91054 Germany
| | - Hans-Martin Jäck
- Division Molecular Immunology, Dept. of Internal Medicine III; Nikolaus Fiebiger Zentrum, Friedrich-Alexander-University Erlangen-Nürnberg; Glückstr. 6 Erlangen D-91054 Germany
| | - Holger Hübner
- Institute of Bioprocess Engineering, Friedrich-Alexander-University Erlangen Nürnberg; Paul-Gordan-Straße 3 Erlangen D-91054 Germany
| | - Wolfgang Schuh
- Division Molecular Immunology, Dept. of Internal Medicine III; Nikolaus Fiebiger Zentrum, Friedrich-Alexander-University Erlangen-Nürnberg; Glückstr. 6 Erlangen D-91054 Germany
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16
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Human CD38hiCD138⁺ plasma cells can be generated in vitro from CD40-activated switched-memory B lymphocytes. J Immunol Res 2014; 2014:635108. [PMID: 25759831 PMCID: PMC4352507 DOI: 10.1155/2014/635108] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2014] [Revised: 11/06/2014] [Accepted: 11/07/2014] [Indexed: 11/17/2022] Open
Abstract
B lymphocyte differentiation into long-lived plasma cells is the keystone event for the production of long-term protective antibodies. CD40-CD154 and CD27-CD70 interactions are involved in human B lymphocyte differentiation into CD38(hi)CD138(+) cells in vivo as well as in vitro. In this study, we have compared these interactions in their capacity to drive switched-memory B lymphocytes differentiation into CD38(hi)CD138(+) plasma cells. The targeted B lymphocytes were isolated from human peripheral blood, expanded for 19 days, and then submitted to CD70 or CD154 interactions for 14 days. The expanded B lymphocytes were constitutively expressing CD39, whereas CD31's expression was noticed only following the in vitro differentiation step (day 5) and was exclusively present on the CD38(hi) cell population. Furthermore, the generated CD38(hi)CD138(+) cells showed a higher proportion of CD31(+) cells than the CD38(hi)CD138(-) cells. Besides, analyses done with human blood and bone marrow plasma cells showed that in vivo and de novo generated CD38(hi)CD138(+) cells have a similar CD31 expression profile but are distinct according to their reduced CD39 expression level. Overall, we have evidences that in vitro generated plasma cells are heterogeneous and appear as CD39(+) precursors to the ones present in bone marrow niches.
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17
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Shimabukuro-Vornhagen A, Zoghi S, Liebig TM, Wennhold K, Chemitz J, Draube A, Kochanek M, Blaschke F, Pallasch C, Holtick U, Scheid C, Theurich S, Hallek M, von Bergwelt-Baildon MS. Inhibition of protein geranylgeranylation specifically interferes with CD40-dependent B cell activation, resulting in a reduced capacity to induce T cell immunity. THE JOURNAL OF IMMUNOLOGY 2014; 193:5294-305. [PMID: 25311809 DOI: 10.4049/jimmunol.1203436] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Ab-independent effector functions of B cells, such as Ag presentation and cytokine production, have been shown to play an important role in a variety of immune-mediated conditions such as autoimmune diseases, transplant rejection, and graft-versus-host disease. Most current immunosuppressive treatments target T cells, are relatively unspecific, and result in profound immunosuppression that places patients at an increased risk of developing severe infections and cancer. Therapeutic strategies, which interfere with B cell activation, could therefore be a useful addition to the current immunosuppressive armamentarium. Using a transcriptomic approach, we identified upregulation of genes that belong to the mevalonate pathway as a key molecular event following CD40-mediated activation of B cells. Inhibition of 3-hydroxy-3-methylglutaryl CoA reductase, the rate-limiting enzyme of the mevalonate pathway, by lipophilic statins such as simvastatin and atorvastatin resulted in a specific inhibition of B cell activation via CD40 and impaired their ability to act as stimulatory APCs for allospecific T cells. Mechanistically, the inhibitory effect resulted from the inhibition of protein geranylgeranylation subsequent to the depletion of mevalonate, the metabolic precursor for geranylgeranyl. Thus, inhibition of geranylgeranylation either directly through geranylgeranyl transferase inhibitors or indirectly through statins represents a promising therapeutic approach for the treatment of diseases in which Ag presentation by B cells plays a role.
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Affiliation(s)
- Alexander Shimabukuro-Vornhagen
- Cologne Interventional Immunology, University Hospital of Cologne, 50924 Cologne, Germany; Stem Cell Transplantation Program, University Hospital of Cologne, 50924 Cologne, Germany; Intensive Care Unit and Laboratory for Department I of Internal Medicine, University Hospital of Cologne, 50924 Cologne, Germany;
| | - Shahram Zoghi
- Cologne Interventional Immunology, University Hospital of Cologne, 50924 Cologne, Germany
| | - Tanja M Liebig
- Cologne Interventional Immunology, University Hospital of Cologne, 50924 Cologne, Germany
| | - Kerstin Wennhold
- Cologne Interventional Immunology, University Hospital of Cologne, 50924 Cologne, Germany
| | - Jens Chemitz
- Stem Cell Transplantation Program, University Hospital of Cologne, 50924 Cologne, Germany
| | - Andreas Draube
- Cologne Interventional Immunology, University Hospital of Cologne, 50924 Cologne, Germany
| | - Matthias Kochanek
- Stem Cell Transplantation Program, University Hospital of Cologne, 50924 Cologne, Germany; Intensive Care Unit and Laboratory for Department I of Internal Medicine, University Hospital of Cologne, 50924 Cologne, Germany
| | - Florian Blaschke
- Department of Cardiology, Charité Campus Virchow-Klinikum, 13353 Berlin, Germany; and Experimental and Clinical Research Center, a joint cooperation between the Charité Medical Faculty and the Max Delbrück Center for Molecular Medicine, 13125 Berlin, Germany
| | - Christian Pallasch
- Stem Cell Transplantation Program, University Hospital of Cologne, 50924 Cologne, Germany
| | - Udo Holtick
- Cologne Interventional Immunology, University Hospital of Cologne, 50924 Cologne, Germany; Stem Cell Transplantation Program, University Hospital of Cologne, 50924 Cologne, Germany
| | - Christof Scheid
- Stem Cell Transplantation Program, University Hospital of Cologne, 50924 Cologne, Germany
| | - Sebastian Theurich
- Cologne Interventional Immunology, University Hospital of Cologne, 50924 Cologne, Germany; Stem Cell Transplantation Program, University Hospital of Cologne, 50924 Cologne, Germany
| | - Michael Hallek
- Stem Cell Transplantation Program, University Hospital of Cologne, 50924 Cologne, Germany; Intensive Care Unit and Laboratory for Department I of Internal Medicine, University Hospital of Cologne, 50924 Cologne, Germany
| | - Michael S von Bergwelt-Baildon
- Cologne Interventional Immunology, University Hospital of Cologne, 50924 Cologne, Germany; Stem Cell Transplantation Program, University Hospital of Cologne, 50924 Cologne, Germany; Intensive Care Unit and Laboratory for Department I of Internal Medicine, University Hospital of Cologne, 50924 Cologne, Germany
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18
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Ghamlouch H, Ouled-Haddou H, Guyart A, Regnier A, Trudel S, Claisse JF, Fuentes V, Royer B, Marolleau JP, Gubler B. Phorbol myristate acetate, but not CD40L, induces the differentiation of CLL B cells into Ab-secreting cells. Immunol Cell Biol 2014; 92:591-604. [PMID: 24797583 PMCID: PMC4134517 DOI: 10.1038/icb.2014.37] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2014] [Revised: 03/21/2014] [Accepted: 03/24/2014] [Indexed: 11/29/2022]
Abstract
In this study, we investigated the capacity of chronic lymphocytic leukemia (CLL) B cells to undergo terminal differentiation into Ig-secreting plasma cells in T cell-independent and T cell-dependent responses. We used a two-step model involving stimulation with phorbol myristate acetate (PMA) and CD40L, together with cytokines (PMA/c and CD40L/c), for 7 days. We describe immunophenotypic modifications, changes in the levels of mRNA and protein for transcription factors and morphological and functional events occurring during the differentiation of CLL B cells into antibody-secreting cells (ASCs). The induction of differentiation differed significantly between the CD40L/c and PMA/c culture systems. The PMA/c culture system allowed CLL B cells to differentiate into IgM-secreting cells with an immunophenotype and molecular profile resembling those of preplasmablasts. By contrast, CD40L/c-stimulated cells had a phenotype and morphology similar to those of activated B cells and resembling those of the CLL B cells residing in the lymph node and bone marrow. These data suggest that the CLL B cells are not frozen permanently at a stage of differentiation and are able to differentiate into ASCs as appropriate stimulation are provided. The data presented here raise questions about the molecular processes and stimulation required for CLL B-cell differentiation and about the inability of CD40 ligand to induce differentiation of the CLL B cells.
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Affiliation(s)
- Hussein Ghamlouch
- EA4666, Laboratoire d'Immunologie, UFR de Médecine, Université de Picardie Jules Verne, Amiens, France
| | - Hakim Ouled-Haddou
- EA4666, Laboratoire d'Immunologie, UFR de Médecine, Université de Picardie Jules Verne, Amiens, France
| | - Aude Guyart
- EA4666, Laboratoire d'Immunologie, UFR de Médecine, Université de Picardie Jules Verne, Amiens, France
| | - Aline Regnier
- 1] EA4666, Laboratoire d'Immunologie, UFR de Médecine, Université de Picardie Jules Verne, Amiens, France [2] Service d'Hématologie Clinique et Thérapie Cellulaire, CHU d'Amiens, Avenue René Laënnec, Amiens, France
| | - Stéphanie Trudel
- 1] EA4666, Laboratoire d'Immunologie, UFR de Médecine, Université de Picardie Jules Verne, Amiens, France [2] Laboratoire d'Oncobiologie Moléculaire, CHU d'Amiens, Avenue René Laënnec, Amiens, France
| | - Jean-François Claisse
- Service d'Hématologie Clinique et Thérapie Cellulaire, CHU d'Amiens, Avenue René Laënnec, Amiens, France
| | - Vincent Fuentes
- EA4666, Laboratoire d'Immunologie, UFR de Médecine, Université de Picardie Jules Verne, Amiens, France
| | - Bruno Royer
- 1] EA4666, Laboratoire d'Immunologie, UFR de Médecine, Université de Picardie Jules Verne, Amiens, France [2] Service d'Hématologie Clinique et Thérapie Cellulaire, CHU d'Amiens, Avenue René Laënnec, Amiens, France
| | - Jean-Pierre Marolleau
- 1] EA4666, Laboratoire d'Immunologie, UFR de Médecine, Université de Picardie Jules Verne, Amiens, France [2] Service d'Hématologie Clinique et Thérapie Cellulaire, CHU d'Amiens, Avenue René Laënnec, Amiens, France
| | - Brigitte Gubler
- 1] EA4666, Laboratoire d'Immunologie, UFR de Médecine, Université de Picardie Jules Verne, Amiens, France [2] Laboratoire d'Oncobiologie Moléculaire, CHU d'Amiens, Avenue René Laënnec, Amiens, France
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19
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Qi Y, Li X, Ma X, Xu L, Zhang X, Jiang X, Hong J, Cui B, Ning G, Wang S. The role of osteopontin in the induction of the CD40 ligand in Graves' disease. Clin Endocrinol (Oxf) 2014; 80:128-34. [PMID: 23617736 DOI: 10.1111/cen.12229] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/22/2013] [Revised: 02/22/2013] [Accepted: 04/22/2013] [Indexed: 01/08/2023]
Abstract
OBJECTIVE Graves' disease (GD) is a common autoimmune disease involved autoantibody production. Although we previously reported that osteopontin (OPN), a proinflammatory protein, affected development of GD through NF-κB activation, little is known about the role of OPN in regulating immunoglobulin production in GD. CD40 Ligand (CD40L) is expressed on the surface of activated CD4+T cells and costimulates CD40 on B cells, stimulating production of immunoglobulins, a process which has been reported to play a vital role in immunological signalling transduction in several autoimmune diseases. This study sought to characterize the relationship between CD40L and GD development, as well as investigating the role of OPN in modulating immunoglobulin production in GD via CD40L. METHODS Forty incident patients with GD, twenty-one patients with GD in remission and twenty-seven healthy controls were recruited. Both membrane-bound and soluble forms of CD40L were measured, and their correlations with clinical parameters were studied. In addition, correlation between OPN and CD40L level was also examined. Furthermore, we studied the regulatory effect of OPN on CD40L in CD4+T cells. RESULTS We demonstrated that the CD40L levels were enhanced in patients with GD and recovered in patients with GD in remission. CD40L levels correlated with clinical GD diagnostic parameters and OPN concentration. Moreover, human recombinant OPN and plasma samples from patients with GD increased CD40L expression, which could be significantly suppressed by OPN monoclonal antibody. In addition, CD40L antibody blocked the immunoglobulin production augmented by OPN in cultured peripheral blood mononuclear cells (PBMCs), isolated from patients with GD and healthy subjects. CONCLUSION These results indicate that CD40L is induced by OPN and serves as the downstream effector of OPN for immunoglobulin production in GD development.
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Affiliation(s)
- Yicheng Qi
- Shanghai Clinical Centre for Endocrine and Metabolic Diseases, Department of Endocrinology and Metabolism, Ruijin Hospital, Affiliated to Shanghai Jiao-Tong University School of Medicine, Shanghai, China; Laboratory of Endocrinology and Metabolism, Institute of Health Sciences, Shanghai Institutes for Biological Sciences (SIBS), Chinese Academy of Sciences (CAS) & Shanghai Jiao Tong University School of Medicine (SJTUSM), Shanghai, China
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Wennhold K, Shimabukuro-Vornhagen A, Theurich S, von Bergwelt-Baildon M. CD40-activated B cells as antigen-presenting cells: the final sprint toward clinical application. Expert Rev Vaccines 2013; 12:631-7. [PMID: 23750793 DOI: 10.1586/erv.13.39] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
Efficient antigen presentation is a prerequisite for the development of a T-cell-mediated immune response in vitro and in vivo. CD40-activated B cells (CD40B cells) are a promising alternative to dendritic cells as professional APCs for immunotherapy. CD40 activation dramatically improves antigen presentation by normal and malignant B cells, efficiently inducing naive and memory CD4(+) and CD8(+) T-cell responses. Moreover, CD40B cells do not only attract T cells by release of chemokines, but also home to secondary lymphoid organs. Furthermore, CD40B cells can be expanded exponentially over several weeks at high purity without a loss of antigen-presenting function, providing an almost unlimited source of cellular adjuvant. Vaccination with CD40B cells was shown in mice and dogs to induce a specific immune response. This article summarizes the achievements of intense research on CD40B cells over the last decade, as well as novel developments critical for a rapid translation into clinical application.
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Affiliation(s)
- Kerstin Wennhold
- Cologne Interventional Immunology, Department I of Internal Medicine, University Hospital of Cologne, Cologne, Germany.
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21
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Impact of Autologous Dendritic Cell–Based Immunotherapy (AGS-004) on B- and T-Cell Subset Changes and Immune Activation in HIV-Infected Patients Receiving Antiretroviral Therapy. J Acquir Immune Defic Syndr 2013; 64:345-50. [DOI: 10.1097/qai.0b013e3182a4b9ad] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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22
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High-content cytometry and transcriptomic biomarker profiling of human B-cell activation. J Allergy Clin Immunol 2013; 133:172-80.e1-10. [PMID: 24012209 DOI: 10.1016/j.jaci.2013.06.047] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2012] [Revised: 05/31/2013] [Accepted: 06/24/2013] [Indexed: 12/27/2022]
Abstract
BACKGROUND Primary antibody deficiencies represent the most prevalent, although very heterogeneous, group of inborn immunodeficiencies, with a puzzling complexity of cellular and molecular processes involved in disease pathogenesis. OBJECTIVE We aimed to study in detail the kinetics of CD40 ligand/IL-21-induced B-cell differentiation to define new biomarker sets for further research into primary antibody deficiencies. METHODS We applied high-content screening methods to monitor B-cell activation on the cellular (chip cytometry) and transcriptomic (RNA microarray) levels. RESULTS The complete activation process, including stepwise changes in protein and RNA expression patterns, entry into the cell cycle, proliferation and expression of activation-induced cytidine deaminase (AID), DNA repair enzymes, and post-class-switch expression of IgA and IgG, was successfully monitored during in vitro differentiation. We identified a number of unknown pathways engaged during B-cell activation, such as CXCL9/CXCL10 secretion by B cells. Finally, we evaluated a deduced set of biomarkers on a group of 18 patients with putative or proved intrinsic B-cell defects recruited from the European Society for Immunodeficiencies database and successfully predicted 2 AID defects and 1 DNA repair defect. Complete absence of class-switched B cells was a sensitive predictor of AID deficiency and should be further evaluated as a diagnostic biomarker. CONCLUSION The biomarkers found in this study could be used to further study the complex process of B-cell activation and to understand conditions that lead to the development of primary antibody deficiencies.
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A cell culture system that mimics chronic lymphocytic leukemia cells microenvironment for drug screening and characterization. Methods Mol Biol 2013; 986:217-26. [PMID: 23436415 DOI: 10.1007/978-1-62703-311-4_14] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Chronic Lymphocytic Leukaemia (CLL) is an incurable disease that warrants new therapeutic treatments. CLL cells accumulate in the peripheral blood, in the bone marrow and in secondary lymphoid organs. Unlike circulating CLL cells, CLL cells resident in these last two compartments display high chemoresistance and proliferative capacity. Given the importance of the microenvironment in this disease, strategies that aim to develop new therapeutic agents need to consider this critical factor. Various cell culture conditions have been described that attempt to emulate either the different types of microenvironments in which CLL cells are found or an individual component of a particular microenvironment. Here, a methodology that partially mimics the interaction between CLL cells and the CD3+ CD4+ CD154+ T cells is described. Moreover, within this method, two protocols are presented and compared that may partially recapitulate different physiological states. The methodology can be exploited for target validation and drug development in CLL.
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Piotrowski P, Lianeri M, Wudarski M, Olesińska M, Jagodziński PP. Single nucleotide polymorphism of CD40 region and the risk of systemic lupus erythematosus. Lupus 2012; 22:233-7. [DOI: 10.1177/0961203312470184] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
There is one study on the association of the CD40 G > T (rs4810485) single nucleotide polymorphism (SNP) as a risk factor of systemic lupus erythematosus (SLE). Therefore, we studied the prevalence of the CD40 G > T SNP in patients with SLE ( n = 261) and controls ( n = 545) in a Polish population. We did not find significant differences between the CD40 G > T genotype and allele frequency in patients with SLE and healthy individuals. However, the frequency of the CD40 TT and GT genotypes was statistically different between patients with arthritis and neurologic manifestations and patients without these symptoms (OR = 0.2009 (95% CI = 0.07547–0.5348, p = 0.0004, pcorr = 0.0068) and OR = 0.2876 (95% CI = 0.1371–0.6031, p = 0.0005, pcorr = 0.0085) respectively). Our observations indicate that the CD40 T variant might be negatively associated with some clinical disease manifestations in patients with SLE.
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Affiliation(s)
- P Piotrowski
- Department of Biochemistry and Molecular Biology, Poznań University of Medical Sciences, Poland
- Mossakowski Medical Research Centre Polish Academy of Sciences, Warsaw, Poland
| | - M Lianeri
- Department of Biochemistry and Molecular Biology, Poznań University of Medical Sciences, Poland
| | - M Wudarski
- Institute of Rheumatology, Warsaw, Poland
| | | | - PP Jagodziński
- Department of Biochemistry and Molecular Biology, Poznań University of Medical Sciences, Poland
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Néron S, Roy A, Dumont N. Large-scale in vitro expansion of polyclonal human switched-memory B lymphocytes. PLoS One 2012; 7:e51946. [PMID: 23284827 PMCID: PMC3524102 DOI: 10.1371/journal.pone.0051946] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2012] [Accepted: 11/12/2012] [Indexed: 12/03/2022] Open
Abstract
Polyclonal preparations of therapeutic immunoglobulins, namely intravenous immunoglobulins (IVIg), are essential in the treatment of immunodeficiency and are increasingly used for the treatment of autoimmune and inflammatory diseases. Currently, patients’ accessibility to IVIg depends exclusively upon volunteer blood donations followed by the fractionation of pooled human plasma obtained from thousands of individuals. Presently, there are no in vitro cell culture procedures allowing the preparation of polyclonal human antibodies. All in vitro human therapeutic antibodies that are currently generated are based on monoclonal antibodies, which are mostly issued from genetic engineering or single cell antibody technologies. Here, we describe an in vitro cell culture system, using CD40-CD154 interactions, that leads to a 1×106-fold expansion of switched memory B lymphocytes in approximately 50 days. These expanded cells secrete polyclonal IgG, which distribution into IgG1, IgG2, IgG3 and IgG4 is similar to that of normal human serum. Such in vitro generated IgG showed relatively low self-reactivity since they interacted moderately with only 24 human antigens among a total of 9484 targets. Furthermore, up to one liter of IgG secreting cells can be produced in about 40 days. This experimental model, providing large-scale expansion of human B lymphocytes, represents a critical step toward the in vitro production of polyclonal human IgG and a new method for the ex vivo expansion of B cells for therapeutic purposes.
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Affiliation(s)
- Sonia Néron
- Héma-Québec, Ingénierie Cellulaire, Recherche et Développement, Québec, Québec, Canada.
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Nadeau PJ, Roy A, Gervais-St-Amour C, Marcotte MÈ, Dussault N, Néron S. Modulation of CD40-activated B lymphocytes by N-acetylcysteine involves decreased phosphorylation of STAT3. Mol Immunol 2011; 49:582-92. [PMID: 22078209 DOI: 10.1016/j.molimm.2011.10.007] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2011] [Revised: 10/14/2011] [Accepted: 10/17/2011] [Indexed: 12/14/2022]
Abstract
B lymphocyte activation, maturation and reshaping require the interaction of its receptor CD40 with its ligand CD154, which is expressed on activated T lymphocytes. Metabolism in activated B lymphocytes is also characterized with several REDOX changes including fluctuation of Reactive Oxygen Species (ROS). Herein, we first confirm that stimulation of human peripheral blood B lymphocyte with CD154 increases intracellular ROS level. Then, by treatments with two well-known antioxidants, N-acetylcysteine (NAC) and Trolox, we further investigate the influence of REDOX fluctuation in CD40-activated B lymphocyte homeostasis in long term culture (13 days). Treatments with NAC increase viability, decrease proliferation and Ig secretion and enhance homoaggregation of B lymphocytes while Trolox only induces a marginal increase of their Ig secretion. The NAC-induced homoaggregation phenotype is paralleled with increased expressions of CD54, CD11a, CD27 and CD38. Mechanistically, a 24h exposure of B lymphocytes with NAC is sufficient to show strong inhibition of STAT3 phosphorylation. Besides, the treatment of B lymphocytes with the STAT3 inhibitor VI increases viability and decreases proliferation and secretion as in NAC-treated cells thus showing a role for STAT3 in these NAC-induced phenotypes. This study done in a human-based model provides new findings on how REDOX fluctuations may modulate CD40-activated B lymphocytes during immune response and provide additional hints on NAC its immunomodulatory functions.
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Affiliation(s)
- Philippe J Nadeau
- Ingénierie cellulaire, Recherche et développement, Héma-Québec, Québec, QC, G1V 5C3, Canada
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