DC vaccine enhances CAR-T cell antitumor activity by overcoming T cell exhaustion and promoting T cell infiltration in solid tumors

Objective Great success has been achieved in CAR-T cell immunotherapy in the treatment of hematological tumors. However, it is particularly difficult in solid tumors, because CAR-T is difficult to enter interior and exert long-term stable immune effects. Dendritic cells (DCs) can not only present tumor antigens but also promote the infiltration of T cells. Therefore, CAR-T cells with the help of DC vaccines are a reliable approach to treat solid tumors. Methods To test whether DC vaccine could promote CAR-T cell therapy in solid tumors, DC vaccine was co-cultured with MSLN CAR-T cells. The in vitro effects of DC vaccine on CAR-T were assessed by measuring cell proliferation, cell differentiation, and cytokine secretion. Effects of DC vaccine on CAR-T were evaluated using mice with subcutaneous tumors in vivo. The infiltration of CAR-T was analyzed using immunofluorescence. The persistence of CAR-T in mouse blood was analyzed using real-time quantitative PCR. Results The results showed that DC vaccine significantly enhanced the proliferation potential of MSLN CAR-T cells in vitro. DC vaccines not only promoted the infiltration of CAR-T cells, but also significantly improved the persistence of CAR-T in solid tumors in vivo. Conclusion In conclusion, this study has demonstrated that DC vaccine can promote CAR-T therapy in solid tumors, which provides the possibility of widespread clinical application of CAR-T cells in the future (AU)

Síndrome de neurotoxicidad asociada a células inmunoefectoras: un enfoque terapéutico en el paciente crítico / Immune effector cell-associated neurotoxicity syndrome: A therapeutic approach in the critically ill

La inmunoterapia con células T modificadas con receptor quimérico antígeno-específico (chimeric antigen receptor conocida como [CAR-T]) está emergiendo como un tratamiento prometedor para enfermedades hematológicas. Así, las CAR-T dirigidas contra el complejo de diferenciación 19 han demostrado gran eficacia antitumoral contra neoplasias de células B resistentes a terapias convencionales. Sin embargo, la activación dirigida de la respuesta inmunitaria desata en ciertos casos complicaciones específicas graves y potencialmente mortales. Entre ellas cabe destacar el síndrome de liberación de citoquinas y el síndrome de toxicidad neurológica asociado a la terapia con células inmunoefectoras (Immune-effector cell associated neurotoxicity syndrome conocido como ICANS), siendo este último el objetivo de nuestra revisión. Aunque los mecanismos fisiopatológicos que conducen al ICANS son poco conocidos, existen factores clínicos y biológicos que aumentan el riesgo de desarrollo de neurotoxicidad asociada a la terapia CAR-T. El tratamiento se basa en medidas de monitorización y soporte, tratamiento con anticonvulsivantes, corticosteroides e ingreso en los servicios de medicina intensiva de forma precoz. Este artículo proporciona una revisión exhaustiva de la literatura disponible sobre el ICANS desde una perspectiva multidisciplinar, incluyendo recomendaciones de intensivistas, neurólogos y hematólogos formados en el cuidado de adultos críticamente enfermos (AU)

Immunotherapy with chimeric antigen-specific receptor modified T cells, known as CAR-T, is emerging as a promising approach to hematological malignancies. In this regard, CAR-T against human cluster of differentiation (CD) 19 has demonstrated antitumor efficacy in application to B cell neoplasms resistant to conventional therapy. However, activation of the immune system induces severe and specific complications which can prove life-threatening. These include cytokine release syndrome and immune effector cell-associated neurotoxicity syndrome (known as ICANS) - the latter being the subject of the present review. Although the physiopathological mechanisms underlying ICANS are not well known, a number of clinical and biological factors increase the risk of developing neurotoxicity associated to CAR-T therapy. Treatment is based on close monitoring, measures of support, anticonvulsivants, corticosteroids, and early admission to intensive care. The present study offers a comprehensive review of the available literature from a multidisciplinary perspective, including recommendations from intensivists, neurologists and hematologists dedicated to the care of critically ill adults (AU)

Characterization of a xenograft model for anti-CD19 CAR T cell studies

Purpose Chimeric antigen receptor (CAR) T cell development for B cell malignancies treatment has triggered a paradigm shift in oncology. The development of anti-CD19 CAR T cells relies primarily on a panel of cell line-derived xenograft models, including Raji cells; however, the behavior of this model is under debate. We attempted to characterize this lymphoma model and propose outcome measures for CAR T cell studies Methods Raji cell line was inoculated into NOG mice via intra-venous (IV), intra-peritoneal (IP), and subcutaneous (SC) routes with different inoculum sizes, and consequent clinical and histopathological outcomes were assessed. Results Inoculum sizes of 105–106 resulted in a complete take rate. The mice with IV and SC-inoculated Raji cells presented the shortest and longest survival among lymphoma-bearing mice, respectively (P < 0.01). The IP group had the highest number of both infiltrated organs (P < 0.05; compared to SC) and involvement of lymphatic sites (P < 0.05; compared to IV). The number of lymphoma lesions on the liver was higher in the IV compared to IP (P < 0.001) and SC (P < 0.05). Conclusion We demonstrate that the Raji cell line inoculation route could determine the xenograft model system behavior in terms of survival, tumor burden, and dissemination pattern and gives the model the specific features suitable for testing the specific hypothesis in CAR T cell therapy. We also conclude outcome measures for CAR T cell studies that do not require imaging techniques (AU)

Programmable and multi-targeted CARs: a new breakthrough in cancer CAR-T cell therapy

CAR-T cell therapy, as a novel immunotherapy approach, has indicated successful results in the treatment of hematological malignancies; however, distinct results have been achieved regarding solid tumors. Tumor immunosuppressive microenvironment has been identified as the most critical barrier in CAR-T cell therapy of solid tumors. Developing novel strategies to augment the safety and efficacy of CAR-T cells could be useful to overcome the solid tumor hurdles. Similar to other cancer treatments, CAR-T cell therapy can cause some side effects, which can disturb the healthy tissues. In the current review, we will discuss the practical breakthroughs in CAR-T cell therapy using the multi-targeted and programmable CARs instead of conventional types. These superior types of CAR-T cells have been developed to increase the function and safety of T cells in a controllable manner, which would diminish the incidence of relevant side effects. Moreover, we will describe the capability of these powerful CARs in targeting multiple tumor antigens, redirecting the CAR-T cells to specific target cells, incrementing the safety of CARs, and other advantages that lead to promising outcomes in cancer CAR-T cell therapy (AU)

Inmunoterapia CAR-T en hemato-oncología pediátrica... presente y futuro / CAR-T immunotherapy in pediatric hemato-oncology... present and future

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Inmunoterapia adoptiva con linfocitos antivirales: métodos y resultados / Adoptive immunotherapy with antiviral T cells: methods and results

Las infecciones y reactivaciones virales siguen siendo una de las principales causas de morbimortalidad en pacientes sometidos a un trasplante alogénico de precursores hematopoyéticos. La inmunoterapia adoptiva de linfocitosT específicos de virus, del donante al paciente, ha demostrado su eficacia en el tratamiento antiviral en pacientes trasplantados que aún no tienen reconstituido su propio sistema inmune. Actualmente, y de acuerdo a los requerimientos de las correspondientes agencias que regulan la producción de estas terapias avanzadas personalizadas, se están optimizando la producción y la aplicación de estos productos celulares, de manera que cumplan con las normas de correcta fabricación (GMP) y sean seguros y efectivos en el tratamiento del paciente. Para facilitar su implementación es necesario entender los fundamentos de la producción y uso de los linfocitosT específicos de virus. En este trabajo hacemos una revisión de la evolución de la metodología en la producción linfocitosT antivirales y los trabajos que avalan su eficacia terapéutica, hasta llegar a las plataformas de producción actuales, cuya comercialización se está iniciando en España y que permiten, entre otros, la obtención de linfocitosT específicos para virus y células CAR-T de manera totalmente automatizada y en condiciones GMP. La implementación de estas nuevas metodologías en el sistema sanitario español sin duda facilitará la accesibilidad de los pacientes a todo un nuevo repertorio de terapias avanzadas

Viral infections and reactivations are one of the main causes of morbidity and mortality in patients who undergo allogeneic haematopoietic progenitor cell transplantation. Adoptive immunotherapy with virus-specific Tcells (from donor to patient) has shown efficacy in the antiviral treatment of patients who have undergone transplantation and whose immune system has not yet been reconstituted. Currently, and according to the requirements of the corresponding agencies that regulate the production of these advanced personalised therapies, the production and application of these cell products are being optimised in such a way that they comply with good manufacturing practice standards and are safe and effective for treating patients. To facilitate their implementation, we need to understand the foundations of producing and using virus-specific Tcells. This study reviews the evolution of the methodology for producing antiviral Tcells and the studies that support their therapeutic efficacy. The study covers up to the current production platforms, whose commercialisation has begun in Spain. These platforms will help obtain virus-specific Tcells and chimeric antigen receptor Tcells, among others, in a completely automated manner and under good manufacturing practice conditions. The implementation of these new methodologies in the Spanish healthcare system will undoubtedly facilitate patients' access to a new repertoire of advanced therapies

CAR-T: luces y sombras / CAR-T: lights and shades

La terapia celular adoptiva está revolucionando el panorama de la terapéutica actual. La gestión de los medicamentos CAR-T supone un reto para el sistema nacional de salud (SNS), pues se trata de medicamentos complejos de un elevado impacto sanitario. En esta línea, la elaboración de protocolos fármaco-clínicos con criterios claramente definidos ayudará a un correcto posicionamiento y selección de los pacientes candidatos a estas terapias. Así mismo, la administración de estos fármacos debe realizarse en centros previamente seleccionados y cualificados para tal fin, garantizando la equidad en el acceso. Por otro lado, es prioritario un abordaje multidisciplinar de todos los pacientes que sean tratados con las terapias CAR-T. Finalmente es fundamental la evaluación y el registro constante de resultados, los cuales contribuirán a determinar el beneficio real de la terapia, reclamando la necesidad de precios equitativos para garantizar la sostenibilidad del SNS y el acceso a los pacientes previamente seleccionados

Adoptive cell therapy is revolutionizing the current therapeutic landscape. The management of CAR-T drugs is a challenge for The National Health System (NHS), as they are complex drugs with high impact on health. This way, the development of clinical pharmaceutical protocols with clearly defined criteria, will help in correct positioning and selection of patients candidates for these therapies. Likewise, administration of these drugs must be carried out in centers previously selected and qualified for this purpose, guaranteeing equity of access. On the other hand, a multidisciplinary approach of all patients treated with CAR-T therapies is a priority. Finally, the assessment and the constant result recording are essencial, since they will contribute to determining the real benefit of these therapies, claiming the need for equitable prices, guaranteeing the sustainability of the NHS and the access of previously selected patients to them

Células CAR T: el futuro ya es presente / CAR T cells: The future is already present

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