Este trabalho foi financiado por uma L. Dan Duncan colaborativo bolsa de investigação (CMB e EJS), o Instituto Nacional do Coração, Pulmão e Sangue (US4HL081007), uma Leucemia e Linfoma Sociedade prêmio Acadêmico de Pesquisa Clínica (CMB), e do Instituto Nacional do Câncer (RO1 CA06150816; EJS).

1. Isolamento de células mononucleares (dia 0) <ol><li> Insira espiga de adaptador luer fêmea no orifício de saída da fracção de 20% da unidade de sangue do cordão umbilical, anexar e remover a seringa do sangue. Transferir sangue descongeladas a 20 mL de RPMI aquecido no tubo de centrífuga de 50 mL. Enxaguar saco de sangue do cordão umbilical com 5 mL de meio RPMI e transferir para o tubo de centrífuga mesmo. </li><li> Centrifugar as células durante 10 minutos a 400 x g. Aspirar o sobrenadante. </li><li> Ressuspender as células em 20 ml de RPMI morno. As células da camada em 15 mL de Lymphoprep em 50 ml de tubo de centrífuga. Centrifugar 40 minutos @ 400 x g. </li><li> Colher a interface contendo as células mononucleares e lava-se em 20 mL de RPMI. Centrifugar durante 10 minutos @ 450 x g. </li><li> Aspirar o sobrenadante e lava-se em 20 mL de RPMI. Contar as células e centrifugação durante 5 minutos a 400 x g. </li><li> Aspirar células sobrenadante e ressuspender a 5 x 10 6 células mononucleares / mL de Cellgenix DC mídia (sem soro). Retirar 1 mL de EBV-LCL geração e colocados em 15 ml centrifuge tubo. </li></ol> 2. Geração de células dendríticas (a partir de dia 0) <ol><li> Placa 2 mL de células (já estão a 5 x 10 6 células / mL de meio DC) por poço numa placa de 6 poços. Deixe na incubadora por 1-2 horas. </li><li> Após 1-2 horas, lavar as células não aderentes por lavagem 3-4 vezes com PBS. Recolher as células não aderentes e congelar. Adicionar 2 mL / poço de meio DC contendo 1000 U / ml de IL-4 e 800 U / mL de GM-CSF. </li><li> 3-4 dias após a iniciação DC, encher a IL-4 e GM-CSF por adição de 100 uL / ​​poço de meio contendo uma concentração final de 1000U/mL IL-4 e 800 U / mL de GM-CSF. </li><li> No dia 5-6, colheita da DC por raspagem do poço com uma pipeta de transferência. Contar as células grandes e centrifugar durante 5 minutos @ 400 x g. Aspirado de mídia e ressuspender DC em 2x10 6 células / ml de DC mídia. Adicionar 0,5 mL / poço de uma placa de 24 poços. </li><li> Transduzir a DC utilizando o vector numa célula Ad5f35pp65 por MOI de 10 unidades infecciosas. Adicionar vector para cada poço de uma placa de 24 poços. Incubar as células durante 1,5 horas. Após 1,5 horas, adicionar 1,5 ml / poço de meio DC contendo: 1000 U / mL de IL-4, 800 U / mL de GM-CSF, 10 ng / mL de TNF-alfa, 1 ug / mL de PGE-1, de 100 ng / mL IL-6, e 10 ng / mL de IL-1beta. Estas citocinas amadurecer os DCs. </li></ol> 3. Geração de EBV-LCL (começando no dia 0) <ol><li> Centrifuga-se o tubo contendo os 5 x 10 6 células mononucleares. Adicionar 200 uL de sobrenadante concentrado EBV B95.8 e 1,8 mL de meio completo (RPMI + 10% de FBS + 2 mM de L-glutamina) contendo ciclosporina (1 ug / mL). </li><li> Alíquota de 100 uL de células em 10 cavidades de uma placa de 96 poços e 200 ul para 5 poços. Adicionam-se 100 ul de meio completo + ciclosporina aos poços contendo apenas 100 ul de células. Encher os poços restantes com água estéril. </li><li> Alimentar o semanal LCL e expandir a partir de uma placa de 96 poços para uma placa de 24 poços depois de aproximadamente 2 semanas. Depois de mais uma semana, transferir para um balão T25 e na transferência de semana subsequenteum frasco T75. Nesta fase, é recomendado que você congelar alíquotas de LCL. Ele normalmente leva um mês para gerar um número suficiente de LCL. </li></ol> 4. CTL Initiation - 7 dias após o início da DCs <ol><li> DCs de colheita e irradiar a 30 Gy. Lavar 4 x e contagem. Ressuspender DC em meios de células T que contêm soro humano (45% de RPMI, 45% CLICK, 10% de soro humano, L-glutamina 2mM) @ 1 x 10 5 DCs / mL. </li><li> Descongelar as células não aderentes a partir do passo 2.2. Lave as células, e contar. Ressuspender a 2 x 10 6 células não aderentes / mL em meio de células T contendo soro humano. Adicionam-se 10 ng / mL de IL-7 e IL-12, e 5 ng / mL de IL-15. Adicionar 1 mL de células por poço numa placa de 24 poços. Adicionar 1 mL de DC por poço. Preencher cavidades vazias de 24 poços da placa com água estéril. </li><li> 7 dias após a iniciação das células T, de alimentação e / ou separar as células com meio contendo soro de células T humanas. </li><li> 9-12 dias após o início da célula T, congelar as células T até que a LCL estão prontos. </li><li> Once LCL expandiram e são passadas em frascos T75, transduzir a LCL por centrifugação durante 5 minutos a 400 x g. Adicionar o vector para a pelete de células a um MOI de 100 unidades infecciosas por célula. Incubar durante 1,5 horas. Após 1,5 horas, ressuspender em meio completo a 5 x 10 5 LCL / mL e adicionar 2 ml por poço numa placa de 24 cavidades 12. </li><li> Após 2 dias, colher o LCL e irradiam a 40 Gy. Lavar 4 x e contagem. Ressuspender o LCL em meio de células T contendo soro humano a 2,5 x 10 5 células / mL. Adicionar 1 mL de LCL por poço de uma placa de 24 poços. Além disso, adicionam-se 5 x 10 6 LCL para um dispositivo de cultura, bem como Grex40 5 ng / mL de IL-15 13. </li><li> Colheita das células T. Centrifugar durante 5 minutos @ xg 400, aspirar o sobrenadante e ressuspender em meio de células T contendo soro humano a 1 x 10 6 células T / mL. Adicionam-se 5 ng / mL de IL-15 e adicionar 1 mL / poço de células T (total de 1 x 10 6 células T) para o LCL que já estão na placa de 24 poços. No Grex40, trazero volume total do material até 30 mL. </li><li> No dia 3-4 de pós-estimulação, se as células confluentes são dividir (na placa) 1:1 e adicionar meio fresco contendo 50 U / mL de IL-2. Se eles não são, em seguida, simplesmente confluente ½ aspirar os meios de comunicação e substitua com meio contendo 50 U / mL de IL-2. No Grex40, aspirar a metade dos meios de comunicação, substituir com novas mídias, e adicionar 50 U / mL de IL-2. </li><li> No dia 7, repetir como no passo 4,6, mas utilização de IL-2 no dia da estimulação, e não a IL-15. </li></ol> 5. Resultados representativos Um esquema do protocolo de fabricação GMP conforme aprovado pelo FDA é apresentada na Figura 1. O processo leva cerca de 50 dias. Métodos típicos de gerar células específicas do vírus T expandir pré-existentes células T de memória, no entanto, carece de sangue do cordão umbilical células T-vírus experientes e, portanto, precisamos nobre ingênuo ex vivo de células T. Para fazer isso, utilizamos células dendríticas assim como as citocinas IL-7, IL-12 e IL-15,necessária para a geração de especificidade viral. Depois de 3 estímulos, o rendimento deverá ser superior a 100x10 6 células. Se as células não estiverem disponíveis, os estímulos adicionais podem ser realizados até que o número desejado de CTLs estão disponíveis. A maioria destas células deve ser CD3 + com uma mistura de células CD4 + e CD8 +. Deverá haver menos de 15% de células NK (CD3-/CD56 +) e menos de 1% de células B CD19 + (Figura 2). O CTL expandido deve reconhecer o antigénio de pp65 de CMV, hexon e penton de adenovirus, bem como numerosos antigénios de EBV, que são expressos em EBV-LCL. Quando testados num ensaio ELISPOT, CTL deve segregar mais IFN-? em resposta a estes antigénios do que os antigénios irrelevantes (Figura 3). O CTL deve também lisar virais peptídeo-pulsados ​​alvos de blastos PHA tais. Num ensaio de libertação de 51Cr, de CTL deve lisar LCL, CMVpp65 pulsado e Adenovirus hexon e /penton ou pulsado alvos, mas não alvos pulsados ​​com peptídeos irrelevantes (Figura 4). <img src="/files/ftp_upload/3627/3627fig1.jpg" alt="Figura 1."/> Figura 1. Geração de multi-virus-specific CTL a partir do sangue do cordão umbilical. Esquemática, que mostra todo o processo de fabrico de CTL a partir do sangue do cordão umbilical. Primeiro, as células mononucleares do sangue do cordão são isolados a partir da fracção de 20% da unidade de fraccionamento de sangue de cordão umbilical. Com a excepção de 5x10 6 células que são guardados para a geração de LCL, todas as células são em seguida incubadas em meio de células dendriticas, durante 1-2 horas, altura em que as células não-aderentes foram colhidas e congeladas. A DC são então alimentados DC media contendo IL-4 e GM-CSF. Após 5 dias de cultura, o DC são amadurecidas e transduzidas com um vector adenoviral contendo o antigénio imunodominante CMV pp65. Na iniciação, estas DC são combinadas com as células não-aderentes, bem como as citocinas IL-7, IL-12,e IL-15. No estimulações subsequentes, o vector adenoviral mesmo é utilizado para transduzir EBV-LCL, que são utilizadas como as células apresentadoras de antigénio. IL-15 é utilizado para a segunda estimulação de IL-2 e em seguida. <img src="/files/ftp_upload/3627/3627fig2.jpg" alt="Figura 2."/> Figura 2. Fenótipo de células T resultante. Mostrada a percentagem de células vivas incluídos na barreira linfocitária. CTL são CD3 + e CD4 + ou CD8 +, mas em grande parte CD3-/CD56- e CD19-. <img src="/files/ftp_upload/3627/3627fig3.jpg" alt="Figura 3."/> Figura 3. T funcionalidade celular. Especificidade das células T foi testada por IFN-γELISPOT. As células T foram pulsadas com peptídeos sobrepostos abrangendo toda a proteína de hexon, penton, pp65 e o antigénio irrelevante IE-1. CTL sozinho indica meio sozinho. LCL autólogas foram irradiadas e adicionado a 1x10 5 / poço. É mostrado o ponto médio formando celular count de poços em triplicado. <img src="/files/ftp_upload/3627/3627fig4.jpg" alt="Figura 4."/> Figura 4. A actividade citolítica de CTL. A capacidade do CTL resultante para lisar alvos que expressam antigénios virais foi testado num ensaio de Cr 51. 51 Cr-blastos autólogos marcados com PHA foram pulsadas com peptídeos sobrepostos abrangendo o antigénio inteiro ou 51Cr-marcado LCL autólogas foram co-cultivadas com CTL. Depois de 4 horas, a libertação de gama foi contada num contador gama.

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<html> As estratégias actuais no sentido de controlar as infecções virais após TCC pode ser eficaz, mas estão associadas com toxicidade significativa, são caros, e não conferem protecção a longo prazo contra a infecção posterior. Na verdade, o uso de algumas drogas antivirais podem limitar a expansão de células T específicas de vírus que de outra forma seria protectora 14. Outra opção é a infusão de doador derivados de vírus-células T específicas. Nós e outros autores mostraram que essas...

<table border="1"><tbody><tr><td> Nome do reagente </td><td> Companhia </td><td> Número de catálogo </td></tr><tr><td> RPMI 1640 </td><td> Invitrogen </td><td> 21870-076 </td></tr><tr><td> DC mídia </td><td> CellGenix </td><td> 20801-0500 </td></tr><tr><td> EHAA (meio de Click) </td><td> Irvine Scientific </td><td> 9195 </td></tr><tr><td> Soro Humano </td><td> Gémeos Bio Products </td><td> 100-110 </td></tr><tr><td> Gás Permeável Cultureware 18 </td><td> Wilson-Wolf </td><td> 80040S </td></tr><tr><td> IL-2 </td><td> Chiron (TCH Farmácia) </td><td></td></tr><tr><td> IL-12 </td><td> NCI / CTEP </td><td></td></tr><tr><td> IL-15 </td><td> CellGenix </td><td> 1013-050 </td></tr><tr><td> IL-7 </td><td> R &amp; D </td><td> AFL207 </td></tr><tr><td> IL-1beta </td><td> R &amp; D </td><td> AFL201 </td></tr><tr><td> IL-6 </td><td> CélulaGenix </td><td> 1004-050 </td></tr><tr><td> GM-CSF </td><td> TCH Farmácia </td><td></td></tr><tr><td> IL-4 </td><td> R &amp; D </td><td> <a href="http://www.rndsystems.com/pdf/AFL204.pdf" target="_blank">AFL204</a> </td></tr><tr><td> TNF-alfa </td><td> R &amp; D </td><td> AFL210 </td></tr><tr><td> Ad5f35pp65 </td><td> BCM CAGT Facilidade de Produção Vector </td><td></td></tr><tr><td> Transferência de plasma conjunto com adaptador luer fêmea </td><td> Carta de Medicina </td><td> 89-550-66J </td></tr><tr><td> Lymphoprep </td><td> Nycomed </td><td> 1114550 </td></tr></tbody></table>

expanding cytotoxic t lymphocytes from umbilical cord blood that target cytomegalovirus, epstein-barr virus, and adenovirus

Infecções por vírus após o transplante de células-tronco estão entre as causas mais comuns de morte, especialmente depois do sangue de cordão umbilical (CB) transplante (CBT), onde o BC não contém números apreciáveis ​​de células T-vírus experientes que podem proteger o destinatário da infecção 1. - 4 Nós e outros autores mostraram que o vírus-specific CTL gerados a partir de dadores seropositivos e injectada para o receptor são seguras e de protecção. 5-8 No entanto, até há pouco tempo, as células T específicas para o vírus não pode ser gerado a partir de sangue do cordão umbilical, provavelmente devido ao ausência de vírus específicos de células T de memória. Num esforço para melhor imitar a condições de estímulo in vivo de células T naive, foi estabelecido um método que utilizou células CB-derivadas dendríticas (DC) transduzida com um vector adenoviral (Ad5f35pp65) contendo o antigénio imunodominante CMV pp65, portanto dirigir a especificidade de células T para CMV e adenovírus. 9 No início, nós usamos estes maDCs estruturadas, bem como derivados de CB células T na presença das citocinas IL-7, IL-12 e IL-15. 10 Na segunda estimulação foi utilizado EBV-células B transformadas, ou EBV-LCL, que expressam tanto latente e antígenos líticos EBV. Ad5f35pp65-EBV-LCL transduzidas são usados ​​para estimular as células T na presença de IL-15 na segunda estimulação. Estimulações subsequentes usam Ad5f35pp65-EBV-LCL transduzidas e IL-2. De 50x10 6 CB células mononucleares que são capazes de gerar mais de 150 x 10 6 de vírus específicos de células T que lisam alvos pulsados ​​antigénio e libertação de citocinas em resposta a estimulação antigénica. 11 Estas células foram fabricadas de um modo compatível com GMP utilizando somente a fracção de 20% de uma unidade de fraccionamento de sangue do cordão e foram traduzidos para o uso clínico.

Watch this Scientific Journal Video about Expanding Cytotoxic T Lymphocytes from Umbilical Cord Blood that Target Cytomegalovirus, Epstein-Barr Virus, and Adenovirus at JoVE.com

Expanding Cytotoxic T Lymphocytes from Umbilical Cord Blood that Target Cytomegalovirus, Epstein-Barr Virus, and Adenovirus

Aqui descrevemos a prática de fabricação primeiro (BPF) compatível com método de produção de vírus específicos linfócitos T citotóxicos (CTL) de sangue de cordão umbilical, fonte de células T predominantemente ingênua.

Expandindo linfócitos T citotóxicos do sangue do cordão umbilical que citomegalovírus Target, vírus de Epstein-Barr, e Adenovirus

Virus infections after stem cell transplantation are among the most common causes of death, especially after cord blood (CB) transplantation (CBT) where ...

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12.7K visualizações.  Baylor College of Medicine. Aqui descrevemos a prática de fabricação primeiro (BPF) compatível com método de produção de vírus específicos linfócitos T citotóxicos (CTL) de sangue de cordão umbilical, fonte de células T predominantemente ingênua.

Vídeo: Expanding Cytotoxic T Lymphocytes from Umbilical Cord Blood that Target Cytomegalovirus, Epstein-Barr Virus, and Adenovirus

Preparation and Use of HIV-1 Infected Primary CD4+ T-Cells as Target Cells in Natural Killer Cell Cytotoxic Assays

Natural killer (NK) cells are a vital component of the innate immune response to virus-infected cells. It is important to understand the ability of NK cells to recognize and lyse HIV-1 infected cells because identifying any aberrancy in NK cell function against HIV-infected cells could potentially lead to therapies that would enhance their cytolytic activity. There is a need to use HIV-infected primary T-cell blasts as target cells rather then infected-T-cell lines in the cytotoxicity assays. T-cell lines, even without infection, are quite susceptible to NK cell lysis. Furthermore, it is necessary to use autologous primary cells to prevent major histocompatibility complex class I mismatches between the target and effector cell that will result in lysis. Early studies evaluating NK cell cytolytic responses to primary HIV-infected cells failed to show significant killing of the infected cells 1,2. However, using HIV-1 infected primary T-cells as target cells in NK cell functional assays has been difficult due the presence of contaminating uninfected cells 3. This inconsistent infected cell to uninfected cell ratio will result in variation in NK cell killing between samples that may not be due to variability in donor NK cell function. Thus, it would be beneficial to work with a purified infected cell population in order to standardize the effector to target cell ratios between experiments 3,4. Here we demonstrate the isolation of a highly purified population of HIV-1 infected cells by taking advantage of HIV-1's ability to down-modulate CD4 on infected cells and the availability of commercial kits to remove dead or dying cells 3-6. The purified infected primary T-cell blasts can then be used as targets in either a degranulation or cytotoxic assay with purified NK cells as the effector population 5-7. Use of NK cells as effectors in a degranulation assay evaluates the ability of an NK cell to release the lytic contents of specialized lysosomes 8 called "cytolytic granules". By staining with a fluorochrome conjugated antibody against CD107a, a lysosomal membrane protein that becomes expressed on the NK cell surface when the cytolytic granules fuse to the plasma membrane, we can determine what percentage of NK cells degranulate in response to target cell recognition. Alternatively, NK cell lytic activity can be evaluated in a cytotoxic assay that allows for the determination of the percentage of target cells lysed by release of 51Cr from within the target cell in the presence of NK cells.

Cytotoxicity assays to measure natural killer cell lytic responses to HIV-infected cells is limited by the purity of the target cells. We demonstrate here the isolation of a highly purified population of HIV-1 infected primary T-cell blasts by taking advantage of HIV-1 s ability to down-modulate CD4.

Preparação e Uso de HIV-1 infectados CD4 + T-Primária células como as células-alvo em Ensaios Natural Killer Celular citotóxicos

 Natural killer (NK) cells are a vital component of the innate immune response to virus-infected cells. It is important to understand the ability of NK ...

Imunologia e Infecção

Methods to Assess Beta Cell Death Mediated by Cytotoxic T Lymphocytes

Type 1 diabetes (T1D) is a T cell mediated autoimmune disease. During the pathogenesis, patients become progressively more insulinopenic as 
insulin production is lost, presumably this results from the destruction of pancreatic beta cells by T cells. Understanding the mechanisms of beta cell death during 
the development of T1D will provide insights to generate an effective cure for this disease. Cell-mediated lymphocytotoxicity (CML) assays have historically used the 
radionuclide Chromium 51 (51Cr) to label target cells. These targets are then exposed to effector cells and the release of 51Cr from target 
cells is read as an indication of lymphocyte-mediated cell death. Inhibitors of cell death result in decreased release of 51Cr.
 As effector cells, we used an activated autoreactive clonal population of CD8+ Cytotoxic T lymphocytes (CTL) isolated from a mouse stock transgenic for both the alpha and beta chains of the AI4 T cell receptor (TCR). Activated AI4 T cells were co-cultured with 51Cr labeled target NIT cells for 16 hours, release of 51Cr was recorded to calculate specific lysis 
Mitochondria participate in many important physiological events, such as energy production, regulation of signaling transduction, and apoptosis. The study of beta cell mitochondrial functional changes during the development of T1D is a novel area of research. Using the mitochondrial membrane potential dye Tetramethyl Rhodamine Methyl Ester (TMRM) and confocal microscopic live cell imaging, we monitored mitochondrial membrane potential over time in the beta cell line NIT-1. For imaging studies, effector AI4 T cells were labeled with the fluorescent nuclear staining dye Picogreen. NIT-1 cells and T cells were co-cultured in chambered coverglass and mounted on the microscope stage equipped with a live cell chamber, controlled at 37&deg;C, with 5% CO2, and humidified. During these experiments images were taken of each cluster every 3 minutes for 400 minutes.
Over a course of 400 minutes, we observed the dissipation of mitochondrial membrane potential in NIT-1 cell clusters where AI4 T cells were attached. In the simultaneous control experiment where NIT-1 cells were co-cultured with MHC mis-matched human lymphocyte Jurkat cells, mitochondrial membrane potential remained intact. This technique can be used to observe real-time changes in mitochondrial membrane potential in cells under attack of cytotoxic lymphocytes, cytokines, or other cytotoxic reagents.

Cell-mediated lymphocytotoxicity (CML) assays can be used to test autoreactive responses and study mechanisms of cell death in vitro. However, using live-cell confocal microscopic imaging techniques with fluorescent dyes, the type and kinetics of cell death as well as the pathways utilized can be studied in greater detail.

Métodos para avaliar Mediated Beta Morte celular por linfócitos T citotóxicos

Type 1 diabetes (T1D) is a T cell mediated autoimmune disease.  During the pathogenesis, patients become progressively more insulinopenic as 
insulin ...

Introducing Shear Stress in the Study of Bacterial Adhesion

During bacterial infections a sequence of interactions occur between the pathogen and its host. Bacterial adhesion to the host cell surface is often the initial and determining step of the pathogenesis. Although experimentally adhesion is mostly studied in static conditions adhesion actually takes place in the presence of flowing liquid. First encounters between bacteria and their host often occur at the mucosal level, mouth, lung, gut, eye, etc. where mucus flows along the surface of epithelial cells. Later in infection, pathogens occasionally access the blood circulation causing life-threatening illnesses such as septicemia, sepsis and meningitis. A defining feature of these infections is the ability of these pathogens to interact with endothelial cells in presence of circulating blood. The presence of flowing liquid, mucus or blood for instance, determines adhesion because it generates a mechanical force on the pathogen. To characterize the effect of flowing liquid one usually refers to the notion of shear stress, which is the tangential force exerted per unit area by a fluid moving near a stationary wall, expressed in dynes/cm2. Intensities of shear stress vary widely according to the different vessels type, size, organ, location etc. (0-100 dynes/cm2). Circulation in capillaries can reach very low shear stress values and even temporarily stop during periods ranging between a few seconds to several minutes 1. On the other end of the spectrum shear stress in arterioles can reach 100 dynes/cm2 2. The impact of shear stress on different biological processes has been clearly demonstrated as for instance during the interaction of leukocytes with the endothelium 3. To take into account this mechanical parameter in the process of bacterial adhesion we took advantage of an experimental procedure based on the use of a disposable flow chamber 4. Host cells are grown in the flow chamber and fluorescent bacteria are introduced in the flow controlled by a syringe pump. We initially focused our investigations on the bacterial pathogen Neisseria meningitidis, a Gram-negative bacterium responsible for septicemia and meningitis. The procedure described here allowed us to study the impact of shear stress on the ability of the bacteria to: adhere to cells 1, to proliferate on the cell surface 5and to detach to colonize new sites 6 (Figure 1). Complementary technical information can be found in reference 7. Shear stress values presented here were chosen based on our previous experience1 and to represent values found in the literature. The protocol should be applicable to a wide range of pathogens with specific adjustments depending on the objectives of the study.

During the infection process, a key step is the adhesion of pathogens with host cells. In most instances this adhesion step occurs in the presence of mechanical stress generated by flowing liquid. We describe a technique that introduces shear stress as an important parameter in the study of bacterial adhesion.

Apresentando tensão de cisalhamento em o Estudo da adesão bacteriana

During bacterial infections a sequence of interactions occur between the pathogen and its host. Bacterial adhesion to the host cell surface is often the ...

Establishment of Epstein-Barr Virus Growth-transformed Lymphoblastoid Cell Lines

Infection of B cells with Epstein-Barr virus (EBV) leads to proliferation and subsequent immortalization, resulting in establishment of lymphoblastoid cell lines (LCL) in vitro. Since LCL are latently infected with EBV, they provide a model system to investigate EBV latency and virus-driven B cell proliferation and tumorigenesis1. LCL have been used to present antigens in a variety of immunologic assays2, 3. In addition, LCL can be used to generate human monoclonal antibodies4, 5 and provide a potentially unlimited source when access to primary biologic materials is limited6, 7.
A variety of methods have been described to generate LCL. Earlier methods have included the use of mitogens such as phytohemagglutinin, lipopolysaccharide8, and pokeweed mitogen9 to increase the efficiency of EBV-mediated immortalization. More recently, others have used immunosuppressive agents such as cyclosporin A to inhibit T cell-mediated killing of infected B cells7, 10-12.
The considerable length of time from EBV infection to establishment of cell lines drives the requirement for quicker and more reliable methods for EBV-driven B cell growth transformation. Using a combination of high titer EBV and an immunosuppressive agent, we are able to consistently infect, transform, and generate LCL from B cells in peripheral blood. This method uses a small amount of peripheral blood mononuclear cells that are infected in vitroclusters of cells can be demonstrated. The presence of CD23 with EBV in the presence of FK506, a T cell immunosuppressant. Traditionally, outgrowth of proliferating B cells is monitored by visualization of microscopic clusters of cells about a week after infection with EBV. Clumps of LCL can be seen by the naked eye after several weeks. We describe an assay to determine early if EBV-mediated growth transformation is successful even before microscopic clusters of cells can be demonstrated. The presence of CD23hiCD58+ cells observed as early as three days post-infection indicates a successful outcome.

We describe a method for generating transformed B cell lines using Epstein-Barr virus. We also illustrate a novel assay that can identify B cells destined to undergo transformation as early as three days after infection.

Estabelecimento de Epstein-Barr Virus Crescimento transformada linhagens de células linfoblastóides

Infection of B cells with Epstein-Barr virus (EBV) leads to proliferation and subsequent immortalization, resulting in establishment of lymphoblastoid ...

Clinical Application of Sleeping Beauty and Artificial Antigen Presenting Cells to Genetically Modify T Cells from Peripheral and Umbilical Cord Blood

The potency of clinical-grade T cells can be improved by combining gene therapy with immunotherapy to engineer a biologic product with the potential for superior (i) recognition of tumor-associated antigens (TAAs), (ii) persistence after infusion, (iii) potential for migration to tumor sites, and (iv) ability to recycle effector functions within the tumor microenvironment. Most approaches to genetic manipulation of T cells engineered for human application have used retrovirus and lentivirus for the stable expression of CAR1-3. This approach, although compliant with current good manufacturing practice (GMP), can be expensive as it relies on the manufacture and release of clinical-grade recombinant virus from a limited number of production facilities. The electro-transfer of nonviral plasmids is an appealing alternative to transduction since DNA species can be produced to clinical grade at approximately 1/10th the cost of recombinant GMP-grade virus. To improve the efficiency of integration we adapted Sleeping Beauty (SB) transposon and transposase for human application4-8. Our SB system uses two DNA plasmids that consist of a transposon coding for a gene of interest (e.g. 2nd generation CD19-specific CAR transgene, designated CD19RCD28) and a transposase (e.g. SB11) which inserts the transgene into TA dinucleotide repeats9-11. To generate clinically-sufficient numbers of genetically modified T cells we use K562-derived artificial antigen presenting cells (aAPC) (clone #4) modified to express a TAA (e.g. CD19) as well as the T cell costimulatory molecules CD86, CD137L, a membrane-bound version of interleukin (IL)-15 (peptide fused to modified IgG4 Fc region) and CD64 (Fc-&gamma; receptor 1) for the loading of monoclonal antibodies (mAb)12. In this report, we demonstrate the procedures that can be undertaken in compliance with cGMP to generate CD19-specific CAR+ T cells suitable for human application. This was achieved by the synchronous electro-transfer of two DNA plasmids, a SB transposon (CD19RCD28) and a SB transposase (SB11) followed by retrieval of stable integrants by the every-7-day additions (stimulation cycle) of &gamma;-irradiated aAPC (clone #4) in the presence of soluble recombinant human IL-2 and IL-2113. Typically 4 cycles (28 days of continuous culture) are undertaken to generate clinically-appealing numbers of T cells that stably express the CAR. This methodology to manufacturing clinical-grade CD19-specific T cells can be applied to T cells derived from peripheral blood (PB) or umbilical cord blood (UCB). Furthermore, this approach can be harnessed to generate T cells to diverse tumor types by pairing the specificity of the introduced CAR with expression of the TAA, recognized by the CAR, on the aAPC.

Clinical Application of Sleeping Beauty and Artificial Antigen Presenting Cells to Genetically Modify T Cells from Peripheral and Umbilical Cord Blood

T cells expressing a CD19-specific chimeric antigen receptor (CAR) are infused as investigational treatment of B-cell malignancies in our first-in-human gene therapy trials. We describe genetic modification of T cells using the Sleeping Beauty (SB) system to introduce CD19-specific CAR and selective propagation on designer CD19+ artificial antigen presenting cells.

Aplicação Clínica de<em&gt; A Bela Adormecida</em&gt; Artificial e Antigen Presenting Cells para modificar geneticamente células T de Sangue do Cordão Umbilical e periférica

The potency of clinical-grade T cells can be improved by combining gene therapy with immunotherapy to engineer  a biologic product with the potential for ...

Isolation of Precursor B-cell Subsets from Umbilical Cord Blood

Umbilical cord blood is highly enriched for hematopoietic progenitor cells at different lineage commitment stages. We have developed a protocol for isolating precursor B-cells at four different stages of differentiation. Because genes are expressed and epigenetic modifications occur in a tissue specific manner, it is vital to discriminate between tissues and cell types in order to be able to identify alterations in the genome and the epigenome that may lead to the development of disease. This method can be adapted to any type of cell present in umbilical cord blood at any stage of differentiation.	
This method comprises 4 main steps. First, mononuclear cells are separated by density centrifugation. Second, B-cells are enriched using biotin conjugated antibodies that recognize and remove non B-cells from the mononuclear cells. Third the B-cells are fluorescently labeled with cell surface protein antibodies specific to individual stages of B-cell development. Finally, the fluorescently labeled cells are sorted and individual populations are recovered. The recovered cells are of sufficient quantity and quality to be utilized in downstream nucleic acid assays.

Here we describe a protocol for isolating subsets of precursor B-cells from umbilical cord blood. A sufficient quantity and quality of nucleic acids may be extracted from the cells and used in subsequent assays utilizing DNA or RNA.

Isolamento de precursor de células B subconjuntos de Sangue do Cordão Umbilical

Umbilical cord blood is highly enriched for hematopoietic progenitor cells at different lineage commitment stages. We have developed a protocol for ...

Isolation and Th17 Differentiation of Na&iuml;ve CD4 T Lymphocytes

Th17 cells are a distinct subset of T cells that have been found to produce interleukin 17 (IL-17), and differ in function from the other T cell subsets including Th1, Th2, and regulatory T cells. Th17 cells have emerged as a central culprit in overzealous inflammatory immune responses associated with many autoimmune disorders. In this method we purify T lymphocytes from the spleen and lymph nodes of C57BL/6 mice, and stimulate purified CD4+ T cells under control and Th17-inducing environments. The Th17-inducing environment includes stimulation in the presence of anti-CD3 and anti-CD28 antibodies, IL-6, and TGF-&#946;. After incubation for at least 72 hours and for up to five days at 37 &#176;C, cells are subsequently analyzed for the capability to produce IL-17 through flow cytometry, qPCR, and ELISAs. Th17 differentiated CD4+CD25- T cells can be utilized to further elucidate the role that Th17 cells play in the onset and progression of autoimmunity and host defense. Moreover, Th17 differentiation of CD4+CD25- lymphocytes from distinct murine knockout/disease models can contribute to our understanding of cell fate plasticity.

Isolation and Th17 Differentiation of Na&amp;#239;ve CD4 T Lymphocytes

With effector functions distinct from other T cell subsets, Th17 cells have been centrally implicated in inflammatory autoimmunity. This in vitro Th17 differentiation protocol provides a means to determine whether na&#239;ve CD4+ T lymphocytes can differentiate into Th17 cells, and to further examine their role in autoimmunity and host response.

Isolamento e Th17 Diferenciação de Linfócitos T CD4 Naïve

Th17 cells are a distinct subset of T cells that have been found to produce interleukin 17 (IL-17), and differ in function from the other T cell subsets ...

Development of an IFN-&#947; ELISpot Assay to Assess Varicella-Zoster Virus-specific Cell-mediated Immunity Following Umbilical Cord Blood Transplantation

Varicella zoster virus (VZV) is a significant cause of morbidity and mortality following umbilical cord blood transplantation (UCBT). For this reason, antiherpetic prophylaxis is administrated systematically to pediatric UCBT recipients to prevent complications associated with VZV infection, but there is no strong, evidence based consensus that defines its optimal duration. Because T cell mediated immunity is responsible for the control of VZV infection, assessing the reconstitution of VZV specific T cell responses following UCBT could provide indications as to whether prophylaxis should be maintained or can be discontinued. To this end, a VZV specific gamma interferon (IFN-&#947;) enzyme-linked immunospot (ELISpot) assay was developed to characterize IFN-&#947; production by T lymphocytes in response to in vitro stimulation with irradiated live attenuated VZV vaccine. This assay provides a rapid, reproducible and sensitive measurement of VZV specific cell mediated immunity suitable for monitoring the reconstitution of VZV specific immunity in a clinical setting and assessing immune responsiveness to VZV antigens. &#160;

Development of an IFN-&amp;#947; ELISpot Assay to Assess Varicella-Zoster Virus-specific Cell-mediated Immunity Following Umbilical Cord Blood Transplantation

Novel generations of functional assays such as gamma interferon (IFN-&#947;) ELISpot, which detect cytokine production at the single cell level and provide both quantitative and qualitative characterization of T cell responses can be used to assess cell-mediated immune responses directed against varicella zoster virus (VZV).

Desenvolvimento de uma varicela-zoster imunidade mediada por células específicas do vírus ELISpot Ensaio para Avaliar-γ IFN Após Cordão Umbilical Transplante de Sangue

Varicella zoster virus (VZV) is a significant cause of morbidity and mortality following umbilical cord blood transplantation (UCBT). For this reason, ...

Generation of Human Alloantigen-specific T Cells from Peripheral Blood

The study of human T lymphocyte biology often involves examination of responses to activating ligands. T cells recognize and respond to processed peptide antigens presented by MHC (human ortholog HLA) molecules through the T cell receptor (TCR) in a highly sensitive and specific manner. While the primary function of T cells is to mediate protective immune responses to foreign antigens presented by self-MHC, T cells respond robustly to antigenic differences in allogeneic tissues. T cell responses to alloantigens can be described as either direct or indirect alloreactivity. In alloreactivity, the T cell responds through highly specific recognition of both the presented peptide and the MHC molecule. The robust oligoclonal response of T cells to allogeneic stimulation reflects the large number of potentially stimulatory alloantigens present in allogeneic tissues. While the breadth of alloreactive T cell responses is an important factor in initiating and mediating the pathology associated with biologically-relevant alloreactive responses such as graft versus host disease and allograft rejection, it can preclude analysis of T cell responses to allogeneic ligands. To this end, this protocol describes a method for generating alloreactive T cells from naive human peripheral blood leukocytes (PBL) that respond to known peptide-MHC (pMHC) alloantigens. The protocol applies pMHC multimer labeling, magnetic bead enrichment and flow cytometry to single cell in vitro culture methods for the generation of alloantigen-specific T cell clones. This enables studies of the biochemistry and function of T cells responding to allogeneic stimulation.

This article describes a method for the generation and propagation of human T cell clones that specifically respond to a defined alloantigen. This protocol can be adapted for cloning human T cells specific for a variety of peptide-MHC ligands.

Geração de Células T humanas alo-específicos a partir de Sangue Periférico

The study of human T lymphocyte biology often involves examination of responses to activating ligands. T cells recognize and respond to processed peptide ...

Radial Mobility and Cytotoxic Function of Retroviral Replicating Vector Transduced, Non-adherent Alloresponsive T Lymphocytes

We report a novel adaptation of the Radial Monolayer Cell Migration assay, first reported to measure the radial migration of adherent tumor cells on extracellular matrix proteins, for measuring the motility of fluorescently-labeled, non-adherent human or murine effector immune cells. This technique employs a stainless steel manifold and 10-well Teflon slide to focally deposit non-adherent T cells into wells prepared with either confluent tumor cell monolayers or extracellular matrix proteins. Light and/or multi-channel fluorescence microscopy is used to track the movement and behavior of the effector cells over time. Fluorescent dyes and/or viral vectors that code for fluorescent transgenes are used to differentially label the cell types for imaging. This method is distinct from similar-type in vitro assays that track horizontal or vertical migration/invasion utilizing slide chambers, agar or transwell plates. The assay allows detailed imaging data to be collected with different cell types distinguished by specific fluorescent markers; even specific subpopulations of cells (i.e., transduced/nontransduced) can be monitored. Surface intensity fluorescence plots are generated using specific fluorescence channels that correspond to the migrating cell type. This allows for better visualization of the non-adherent immune cell mobility at specific times. It is possible to gather evidence of other effector cell functions, such as cytotoxicity or transfer of viral vectors from effector to target cells, as well. Thus, the method allows researchers to microscopically document cell-to-cell interactions of differentially-labeled, non-adherent with adherent cells of various types. Such information may be especially relevant in the assessment of biologically-manipulated or activated immune cell types, where visual proof of functionality is desired with tumor target cells before their use for cancer therapy.

We describe a protocol to monitor radial mobility of non-adherent immune cells in vitro using a cell sedimentation manifold/slide apparatus. Cell migration is tracked on monolayers of tumor cells or on extracellular matrix proteins. Examination by light and fluorescence microscopy allows for observation of cell mobility and cytotoxic functionality.

Radial Mobilidade e função citotóxica de Retroviral Replicando Vector transduzidas, Alloresponsive não aderentes Linfócitos T

We report a novel adaptation of the Radial Monolayer Cell Migration assay, first reported to measure the radial migration of adherent tumor cells on ...