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  1. Article ; Online: Point-of-care cell therapy manufacturing; it's not for everyone.

    Stroncek, David F / Somerville, Robert P T / Highfill, Steven L

    Journal of translational medicine

    2022  Volume 20, Issue 1, Page(s) 34

    Abstract: The use of cellular therapies to treat cancer, inherited immune deficiencies, hemoglobinopathies and viral infections is growing rapidly. The increased interest in cellular therapies has led to the development of reagents and closed-system automated ... ...

    Abstract The use of cellular therapies to treat cancer, inherited immune deficiencies, hemoglobinopathies and viral infections is growing rapidly. The increased interest in cellular therapies has led to the development of reagents and closed-system automated instruments for the production of these therapies. For cellular therapy clinical trials involving multiple sites some people are advocating a decentralized model of manufacturing where patients are treated with cells produced using automated instruments at each participating center using a single, centrally held Investigational New Drug Application (IND). Many academic centers are purchasing these automated instruments for point-of-care manufacturing and participation in decentralized multiple center clinical trials. However, multiple site manufacturing requires harmonization of product testing and manufacturing in order to interpret the clinical trial results. Decentralized manufacturing is quite challenging since all centers should use the same manufacturing protocol, the same or comparable in-process and lot release assays and the quality programs from each center must work closely together. Consequently, manufacturing cellular therapies using a decentralized model is in many ways more difficult than manufacturing cells in a single centralized facility. Before an academic center decides to establish a point-of-care cell processing laboratory, they should consider all costs associated with such a program. For many academic cell processing centers, point-of-care manufacturing may not be a good investment.
    MeSH term(s) Cell- and Tissue-Based Therapy ; Humans ; Neoplasms ; Point-of-Care Systems
    Language English
    Publishing date 2022-01-15
    Publishing country England
    Document type Letter ; Research Support, N.I.H., Intramural
    ZDB-ID 2118570-0
    ISSN 1479-5876 ; 1479-5876
    ISSN (online) 1479-5876
    ISSN 1479-5876
    DOI 10.1186/s12967-022-03238-5
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Scaling up and scaling out: Advances and challenges in manufacturing engineered T cell therapies.

    Song, Hannah W / Somerville, Robert P / Stroncek, David F / Highfill, Steven L

    International reviews of immunology

    2022  Volume 41, Issue 6, Page(s) 638–648

    Abstract: Engineered T cell therapies such as CAR-T cells and TCR-T cells have generated impressive patient responses in previously incurable diseases. In the past few years there have been a number of technical innovations that enable robust clinical ... ...

    Abstract Engineered T cell therapies such as CAR-T cells and TCR-T cells have generated impressive patient responses in previously incurable diseases. In the past few years there have been a number of technical innovations that enable robust clinical manufacturing in functionally closed and often automated systems. Here we describe the latest technology used to manufacture CAR- and TCR-engineered T cells in the clinic, including cell purification, transduction/transfection, expansion and harvest. To help compare the different systems available, we present three case studies of engineered T cells manufactured for phase I clinical trials at the NIH Clinical Center (CD30 CAR-T cells for lymphoma, CD19/CD22 bispecific CAR-T cells for B cell malignancies, and E7 TCR T cells for human papilloma virus-associated cancers). Continued improvement in cell manufacturing technology will help enable world-wide implementation of engineered T cell therapies.
    MeSH term(s) Humans ; Receptors, Antigen, T-Cell/genetics ; Immunotherapy, Adoptive ; T-Lymphocytes ; Neoplasms/therapy ; B-Lymphocytes
    Chemical Substances Receptors, Antigen, T-Cell
    Language English
    Publishing date 2022-04-29
    Publishing country England
    Document type Journal Article ; Research Support, N.I.H., Intramural
    ZDB-ID 632825-8
    ISSN 1563-5244 ; 1545-5858 ; 0883-0185
    ISSN (online) 1563-5244 ; 1545-5858
    ISSN 0883-0185
    DOI 10.1080/08830185.2022.2067154
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Overcoming Challenges in Process Development of Cellular Therapies.

    Highfill, Steven L / Stroncek, David F

    Current hematologic malignancy reports

    2019  Volume 14, Issue 4, Page(s) 269–277

    Abstract: Purpose of the review: Cellular therapy using chimeric antigen receptor (CAR) T cells as a treatment option for patients with lymphoma and leukemia has proven to be remarkably efficacious. This success has sparked the development of new cellular therapy ...

    Abstract Purpose of the review: Cellular therapy using chimeric antigen receptor (CAR) T cells as a treatment option for patients with lymphoma and leukemia has proven to be remarkably efficacious. This success has sparked the development of new cellular therapy products for numerous indications. Similar to pharmaceutical products, challenges exist at nearly every stage of process development; however, the unique nature of a cellular therapy product can present exceptional challenges that are just beginning to emerge. The purpose of this review is to explore some of the most common challenges experienced during the early phases of development of CAR T cell products and to provide suggestions for navigating these challenges.
    Recent findings: Recent articles focused on CAR T cells are highlighted with special attention on aspects that relate to CAR T cell process development and clinical manufacturing. We examine the various stages of process development for CAR T cells and outline some of the obstacles that must be overcome in order to move from pre-clinical development into clinical manufacturing. As the field of CAR T cell therapy continues to grow, it is important to quickly move new CAR T cell products into and through early phase clinical trials and to ensure that the result of these trials can be adequately compared. Having laboratory and clinical investigators and GMP manufacturing facilities aligned on the numerous aspects of new product development will facilitate this process.
    MeSH term(s) Animals ; Antibodies/immunology ; Antigen-Presenting Cells/immunology ; Antigen-Presenting Cells/metabolism ; Batch Cell Culture Techniques ; Bioreactors ; Cell Culture Techniques ; Cell Engineering/methods ; Cell Separation/methods ; Cell- and Tissue-Based Therapy/adverse effects ; Cell- and Tissue-Based Therapy/methods ; Cell- and Tissue-Based Therapy/standards ; Cytokines/metabolism ; Gene Transfer Techniques ; Genetic Engineering/methods ; Humans ; Immunotherapy, Adoptive ; Receptors, Antigen, T-Cell/genetics ; Receptors, Antigen, T-Cell/metabolism ; Receptors, Chimeric Antigen/genetics ; Receptors, Chimeric Antigen/metabolism ; T-Lymphocytes/immunology ; T-Lymphocytes/metabolism
    Chemical Substances Antibodies ; Cytokines ; Receptors, Antigen, T-Cell ; Receptors, Chimeric Antigen
    Language English
    Publishing date 2019-07-07
    Publishing country United States
    Document type Journal Article ; Review
    ZDB-ID 2229765-0
    ISSN 1558-822X ; 1558-8211
    ISSN (online) 1558-822X
    ISSN 1558-8211
    DOI 10.1007/s11899-019-00529-5
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article: Optimization of anti-CD19 CAR T cell production for treatment of patients with chronic lymphocytic leukemia.

    Amatya, Christina / Weissler, Katherine A / Fellowes, Vicki / Lam, Norris / Cutmore, Lauren C / Natrakul, Danielle A / Highfill, Steven L / Kochenderfer, James N

    Molecular therapy. Methods & clinical development

    2024  Volume 32, Issue 1, Page(s) 101212

    Abstract: T cells expressing anti-CD19 chimeric antigen receptors (CARs) have activity against chronic lymphocytic leukemia (CLL), but complete response rates range from 18% to 29%, so improvement is needed. Peripheral blood mononuclear cells (PBMCs) of CLL ... ...

    Abstract T cells expressing anti-CD19 chimeric antigen receptors (CARs) have activity against chronic lymphocytic leukemia (CLL), but complete response rates range from 18% to 29%, so improvement is needed. Peripheral blood mononuclear cells (PBMCs) of CLL patients often contain high levels of CLL cells that can interfere with CAR T cell production, and T cells from CLL patients are prone to exhaustion and other functional defects. We previously developed an anti-CD19 CAR designated Hu19-CD828Z. Hu19-CD828Z has a binding domain derived from a fully human antibody and a CD28 costimulatory domain. We aimed to develop an optimized process for producing Hu19-CD828Z-expressing T cells (Hu19-CAR T) from PBMC of CLL patients. We determined that supplementing Hu19-CAR-T cultures with interleukin (IL)-7 + IL-15 had advantages over using IL-2, including greater accumulation of Hu19-CAR T cells during
    Language English
    Publishing date 2024-02-13
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2872938-9
    ISSN 2329-0501 ; 2329-0501
    ISSN (online) 2329-0501
    ISSN 2329-0501
    DOI 10.1016/j.omtm.2024.101212
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: CAR-T cell expansion platforms yield distinct T cell differentiation states.

    Song, Hannah W / Prochazkova, Michaela / Shao, Lipei / Traynor, Roshini / Underwood, Sarah / Black, Mary / Fellowes, Vicki / Shi, Rongye / Pouzolles, Marie / Chou, Hsien-Chao / Cheuk, Adam T / Taylor, Naomi / Jin, Ping / Somerville, Robert P / Stroncek, David F / Khan, Javed / Highfill, Steven L

    Cytotherapy

    2024  

    Abstract: With investigators looking to expand engineered T cell therapies such as CAR-T to new tumor targets and patient populations, a variety of cell manufacturing platforms have been developed to scale manufacturing capacity using closed and/or automated ... ...

    Abstract With investigators looking to expand engineered T cell therapies such as CAR-T to new tumor targets and patient populations, a variety of cell manufacturing platforms have been developed to scale manufacturing capacity using closed and/or automated systems. Such platforms are particularly useful for solid tumor targets, which typically require higher CAR-T cell doses. Although T cell phenotype and function are key attributes that often correlate with therapeutic efficacy, how manufacturing platforms influence the final CAR-T cell product is currently unknown. We compared 4 commonly used T cell manufacturing platforms (CliniMACS Prodigy, Xuri W25 rocking platform, G-Rex gas-permeable bioreactor, static bag culture) using identical media, stimulation, culture length, and donor starting material. Selected CD4
    Language English
    Publishing date 2024-03-12
    Publishing country England
    Document type Journal Article
    ZDB-ID 2039821-9
    ISSN 1477-2566 ; 1465-3249
    ISSN (online) 1477-2566
    ISSN 1465-3249
    DOI 10.1016/j.jcyt.2024.03.003
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Assessment and comparison of viability assays for cellular products.

    Cai, Yihua / Prochazkova, Michaela / Kim, Yong-Soo / Jiang, Chunjie / Ma, Jinxia / Moses, Larry / Martin, Kathryn / Pham, Victoria / Zhang, Nan / Highfill, Steven L / Somerville, Robert P / Stroncek, David F / Jin, Ping

    Cytotherapy

    2023  Volume 26, Issue 2, Page(s) 201–209

    Abstract: Background aims: Accurate assessment of cell viability is crucial in cellular product manufacturing, yet selecting the appropriate viability assay presents challenges due to various factors. This study compares and evaluates different viability assays ... ...

    Abstract Background aims: Accurate assessment of cell viability is crucial in cellular product manufacturing, yet selecting the appropriate viability assay presents challenges due to various factors. This study compares and evaluates different viability assays on fresh and cryopreserved cellular products, including peripheral blood stem cell (PBSC) and peripheral blood mononuclear cell (PBMC) apheresis products, purified PBMCs and cultured chimeric antigen receptor and T-cell receptor-engineered T-cell products.
    Methods: Viability assays, including manual Trypan Blue exclusion, flow cytometry-based assays using 7-aminoactinomycin D (7-AAD) or propidium iodide (PI) direct staining or cell surface marker staining in conjunction with 7-AAD, Cellometer (Nexcelom Bioscience LLC, Lawrence, MA, USA) Acridine Orange/PI staining and Vi-CELL BLU Cell Viability Analyzer (Beckman Coulter, Inc, Brea, CA, USA), were evaluated. A viability standard was established using live and dead cell mixtures to assess the accuracy of these assays. Furthermore, precision assessment was conducted to determine the reproducibility of the viability assays. Additionally, the viability of individual cell populations from cryopreserved PBSC and PBMC apheresis products was examined.
    Results: All methods provided accurate viability measurements and generated consistent and reproducible viability data. The assessed viability assays were demonstrated to be reliable alternatives when evaluating the viability of fresh cellular products. However, cryopreserved products exhibited variability among the tested assays. Additionally, analyzing the viability of each subset of the cryopreserved PBSC and PBMC apheresis products revealed that T cells and granulocytes were more susceptible to the freeze-thaw process, showing decreased viability.
    Conclusions: The study demonstrates the importance of careful assay selection, validation and standardization, particularly for assessing the viability of cryopreserved products. Given the complexity of cellular products, choosing a fit-for-purpose viability assay is essential.
    MeSH term(s) Leukocytes, Mononuclear ; Reproducibility of Results ; Cell Survival ; Trypan Blue ; Cryopreservation/methods ; Flow Cytometry/methods
    Chemical Substances Trypan Blue (I2ZWO3LS3M)
    Language English
    Publishing date 2023-12-11
    Publishing country England
    Document type Journal Article
    ZDB-ID 2039821-9
    ISSN 1477-2566 ; 1465-3249
    ISSN (online) 1477-2566
    ISSN 1465-3249
    DOI 10.1016/j.jcyt.2023.11.008
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: Optimizing a fully automated and closed system process for red blood cell reduction of human bone marrow products.

    Remley, Victoria Ann / Collins, Ashley / Underwood, Sarah / Jin, Jianjian / Kim, Yoon / Cai, Yihua / Prochazkova, Michaela / Moses, Larry / Byrne, Karen M / Jin, Ping / Stroncek, David F / Highfill, Steven L

    Cytotherapy

    2023  Volume 25, Issue 4, Page(s) 442–450

    Abstract: Background aims: Hematopoietic stem cell transplantation using bone marrow as the graft source is a common treatment for hematopoietic malignancies and disorders. For allogeneic transplants, processing of bone marrow requires the depletion of ABO- ... ...

    Abstract Background aims: Hematopoietic stem cell transplantation using bone marrow as the graft source is a common treatment for hematopoietic malignancies and disorders. For allogeneic transplants, processing of bone marrow requires the depletion of ABO-mismatched red blood cells (RBCs) to avoid transfusion reactions. Here the authors tested the use of an automated closed system for depleting RBCs from bone marrow and compared the results to a semi-automated platform that is more commonly used in transplant centers today. The authors found that fully automated processing using the Sepax instrument (Cytiva, Marlborough, MA, USA) resulted in depletion of RBCs and total mononuclear cell recovery that were comparable to that achieved with the COBE 2991 (Terumo BCT, Lakewood, CO, USA) semi-automated process.
    Methods: The authors optimized the fully automated and closed Sepax SmartRedux (Cytiva) protocol. Three reduction folds (10×, 12× and 15×) were tested on the Sepax. Each run was compared with the standard processing performed in the authors' center on the COBE 2991. Given that bone marrow is difficult to acquire for these purposes, the authors opted to create a surrogate that is more easily obtainable, which consisted of cryopreserved peripheral blood stem cells that were thawed and mixed with RBCs and supplemented with Plasma-Lyte A (Baxter, Deerfield, IL, USA) and 4% human serum albumin (Baxalta, Westlake Village, CA, USA). This "bone marrow-like" product was split into two starting products of approximately 600 mL, and these were loaded onto the COBE and Sepax for direct comparison testing. Samples were taken from the final products for cell counts and flow cytometry. The authors also tested a 10× Sepax reduction using human bone marrow supplemented with human liquid plasma and RBCs.
    Results: RBC reduction increased as the Sepax reduction rate increased, with an average of 86.06% (range of 70.85-96.39%) in the 10×, 98.80% (range of 98.1-99.5%) in the 12× and 98.89% (range of 98.80-98.89%) in the 15×. The reduction rate on the COBE ranged an average of 69.0-93.15%. However, white blood cell (WBC) recovery decreased as the Sepax reduction rate increased, with an average of 47.65% (range of 38.9-62.35%) in the 10×, 14.56% (range of 14.34-14.78%) in the 12× and 27.97% (range of 24.7-31.23%) in the 15×. COBE WBC recovery ranged an average of 53.17-76.12%. Testing a supplemented human bone marrow sample using a 10× Sepax reduction resulted in an average RBC reduction of 84.22% (range of 84.0-84.36%) and WBC recovery of 43.37% (range of 37.48-49.26%). Flow cytometry analysis also showed that 10× Sepax reduction resulted in higher purity and better recovery of CD34+, CD3+ and CD19+ cells compared with 12× and 15× reduction. Therefore, a 10× reduction rate was selected for the Sepax process.
    Conclusions: The fully automated and closed SmartRedux program on the Sepax was shown to be effective at reducing RBCs from "bone marrow-like" products and a supplemented bone marrow product using a 10× reduction rate.
    MeSH term(s) Humans ; Bone Marrow ; Erythrocytes ; Hematopoietic Stem Cell Transplantation/methods ; Bone Marrow Transplantation ; Flow Cytometry
    Language English
    Publishing date 2023-01-27
    Publishing country England
    Document type Journal Article ; Research Support, N.I.H., Intramural ; Research Support, N.I.H., Extramural
    ZDB-ID 2039821-9
    ISSN 1477-2566 ; 1465-3249
    ISSN (online) 1477-2566
    ISSN 1465-3249
    DOI 10.1016/j.jcyt.2022.12.006
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article ; Online: Reference gene selection for clinical chimeric antigen receptor T-cell product vector copy number assays.

    Ma, Jinxia / Shao, Lipei / Fuksenko, Tatyana / Liu, Hui / Shi, Rongye / Dinh, Anh / Highfill, Steven L / Zhang, Nan / Panch, Sandhya R / Somerville, Robert P / Stroncek, David F / Jin, Ping

    Cytotherapy

    2023  Volume 25, Issue 6, Page(s) 598–604

    Abstract: Background aims: Reference genes are an essential part of clinical assays such as droplet digital polymerase chain reaction (ddPCR), which measure the number of copies of vector integrated into genetically engineered cells and the loss of plasmids in ... ...

    Abstract Background aims: Reference genes are an essential part of clinical assays such as droplet digital polymerase chain reaction (ddPCR), which measure the number of copies of vector integrated into genetically engineered cells and the loss of plasmids in reprogrammed cells used in clinical cell therapies. Care should be taken to select reference genes, because it has been discovered that there may be thousands of variations in copy number from genomic segments among different individuals. In addition, within the same person in the context of cancer and other proliferative disorders, substantial parts of the genome also can differ in copy number between cells from diseased and healthy people. The purpose of this study was to identify reference genes that could be used for copy number variation analysis of transduced chimeric antigen receptor T cells and for plasmid loss analysis in induced pluripotent stem cells using ddPCR.
    Methods: We used The Cancer Genome Atlas (TCGA) to evaluate candidate reference genes. If TCGA found a candidate gene to have low copy number variance in cancer, ddPCR was used to measure the copy numbers of the potential reference gene in cells from healthy subjects, cancer cell lines and patients with acute lymphocytic leukemia, lymphoma, multiple myeloma and human papillomavirus-associated cancers.
    Results: In addition to the rPP30 gene, which we have has been using in our copy number assays, three other candidate reference genes were evaluated using TCGA, and this analysis found that none of the four gene regions (AGO1, AP3B1, MKL2 and rPP30) were amplified or deleted in all of the cancer cell types that are currently being treated with cellular therapies by our facility. The number of copies of the genes AP3B1, AGO1, rPP30 and MKL2 measured by ddPCR was similar among cells from healthy subjects. We found that AGO1 had copy number alteration in some of the clinical samples, and the number of copies of the genes AP3B1, MKL2 and rPP30 measured by ddPCR was similar among cells from patients with the cancer cell types that are currently being treated with genetically engineered T-cell therapies by our facility.
    Conclusions: Based on our current results, the three genes, AP3B1, MKL2 and rPP30, are suitable for use as reference genes for assays measuring vector copy number in chimeric antigen receptor T cells produced from patients with acute leukemia, lymphoma, multiple myeloma and human papillomavirus-associated cancers. We will continue to evaluate AGO1 on our future samples.
    MeSH term(s) Humans ; DNA Copy Number Variations/genetics ; Receptors, Chimeric Antigen/genetics ; Multiple Myeloma/genetics ; Multiple Myeloma/therapy ; T-Lymphocytes ; Polymerase Chain Reaction/methods
    Chemical Substances Receptors, Chimeric Antigen
    Language English
    Publishing date 2023-03-21
    Publishing country England
    Document type Journal Article ; Research Support, N.I.H., Intramural
    ZDB-ID 2039821-9
    ISSN 1477-2566 ; 1465-3249
    ISSN (online) 1477-2566
    ISSN 1465-3249
    DOI 10.1016/j.jcyt.2023.02.010
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article ; Online: Immunomagnetic B cell isolation as a tool to study blood cell subsets and enrich B cell transcripts.

    Henning, Amanda N / Green, Daniel / Baumann, Ryan / Grandinetti, Patrick / Highfill, Steven L / Zhou, Huizhi / De Giorgi, Valeria

    BMC research notes

    2021  Volume 14, Issue 1, Page(s) 418

    Abstract: Objective: Transcriptional profiling of immune cells is an indispensable tool in biomedical research; however, heterogenous sample types routinely used in transcriptomic studies may mask important cell type-specific transcriptional differences. ... ...

    Abstract Objective: Transcriptional profiling of immune cells is an indispensable tool in biomedical research; however, heterogenous sample types routinely used in transcriptomic studies may mask important cell type-specific transcriptional differences. Techniques to isolate desired cell types are used to overcome this limitation. We sought to evaluate the use of immunomagnetic B cell isolation on RNA quality and transcriptional output. Additionally, we aimed to develop a B cell gene signature representative of a freshly isolated B cell population to be used as a tool to verify isolation efficacy and to provide a transcriptional standard for evaluating maintenance or deviation from traditional B cell identity.
    Results: We found RNA quality and RNA-sequencing output to be comparable between donor-matched PBMC, whole blood, and B cells following negative selection by immunomagnetic B cell isolation. Transcriptional analysis enabled the development of an 85 gene B cell signature. This signature effectively clustered isolated B cells from heterogeneous sample types in our study and naïve and memory B cells when applied to transcriptional data from a published source. Additionally, by identifying B cell signature genes whose functional role in B cells is currently unknown, our gene signature has uncovered areas for future investigation.
    MeSH term(s) B-Lymphocytes ; Cell Separation ; Gene Expression Profiling ; Leukocytes, Mononuclear ; RNA ; Transcriptome
    Chemical Substances RNA (63231-63-0)
    Language English
    Publishing date 2021-11-18
    Publishing country England
    Document type Journal Article
    ZDB-ID 2413336-X
    ISSN 1756-0500 ; 1756-0500
    ISSN (online) 1756-0500
    ISSN 1756-0500
    DOI 10.1186/s13104-021-05833-z
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: Deciphering the importance of culture pH on CD22 CAR T-cells characteristics.

    Prochazkova, Michaela / Dreyzin, Alexandra / Shao, Lipei / Garces, Pam / Cai, Yihua / Shi, Rongye / Pelayo, Alejandra / Kim, Yong Soo / Pham, Victoria / Frodigh, Sue Ellen / Fenton, Shannon / Karangwa, Catherine / Su, Yan / Martin, Kathryn / Zhang, Nan / Highfill, Steven L / Somerville, Robert P / Shah, Nirali N / Stroncek, David F /
    Jin, Ping

    Journal of translational medicine

    2024  Volume 22, Issue 1, Page(s) 384

    Abstract: Background: Chimeric antigen receptor (CAR) T-cells have demonstrated significant efficacy in targeting hematological malignancies, and their use continues to expand. Despite substantial efforts spent on the optimization of protocols for CAR T-cell ... ...

    Abstract Background: Chimeric antigen receptor (CAR) T-cells have demonstrated significant efficacy in targeting hematological malignancies, and their use continues to expand. Despite substantial efforts spent on the optimization of protocols for CAR T-cell manufacturing, critical parameters of cell culture such as pH or oxygenation are rarely actively monitored during cGMP CAR T-cell generation. A comprehensive understanding of the role that these factors play in manufacturing may help in optimizing patient-specific CAR T-cell therapy with maximum benefits and minimal toxicity.
    Methods: This retrospective study examined cell culture supernatants from the manufacture of CAR T-cells for 20 patients with B-cell malignancies enrolled in a phase 1/2 clinical trial of anti-CD22 CAR T-cells. MetaFLEX was used to measure supernatant pH, oxygenation, and metabolites, and a Bio-Plex assay was used to assess protein levels. Correlations were assessed between the pH of cell culture media throughout manufacturing and cell proliferation as well as clinical outcomes. Next-generation sequencing was conducted to examine gene expression profiles of the final CAR T-cell products.
    Results: A pH level at the lower range of normal at the beginning of the manufacturing process significantly correlated with measures of T-cell expansion and metabolism. Stable or rising pH during the manufacturing process was associated with clinical response, whereas a drop in pH was associated with non-response.
    Conclusions: pH has potential to serve as an informative factor in predicting CAR T-cell quality and clinical outcomes. Thus, its active monitoring during manufacturing may ensure a more effective CAR T-cell product.
    MeSH term(s) Humans ; Hydrogen-Ion Concentration ; T-Lymphocytes/immunology ; Sialic Acid Binding Ig-like Lectin 2/metabolism ; Receptors, Chimeric Antigen/metabolism ; Cell Proliferation ; Cell Culture Techniques
    Chemical Substances Sialic Acid Binding Ig-like Lectin 2 ; Receptors, Chimeric Antigen
    Language English
    Publishing date 2024-04-24
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2118570-0
    ISSN 1479-5876 ; 1479-5876
    ISSN (online) 1479-5876
    ISSN 1479-5876
    DOI 10.1186/s12967-024-05197-5
    Database MEDical Literature Analysis and Retrieval System OnLINE

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