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Zaninelli S, Meli C, Borleri G, Quaroni M, Pavoni C, Gaipa G, Biondi A, Introna M, Golay J, Rambaldi A, Rambaldi B. Optimization and validation of in vivo flow cytometry chimeric antigen receptor T cell detection method using CD19his indirect staining. Cytometry A 2024; 105:112-123. [PMID: 37707318 DOI: 10.1002/cyto.a.24796] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2023] [Revised: 09/01/2023] [Accepted: 09/12/2023] [Indexed: 09/15/2023]
Abstract
CD19-targeted chimeric antigen receptor T (CAR-T) cell therapy has shown unprecedented results in patients with B cell relapsed/refractory acute lymphoblastic leukemia (R/R-ALL) and B cell non-Hodgkin lymphomas where no other curative options are available. In vivo monitoring of CAR-T cell kinetics is fundamental to understand the correlation between CAR-T cells expansion and persistence with treatment response and toxicity development. The aim of this study was to define a robust, sensitive, and universal method for CAR-T cell detection using flow cytometry. We set up and compared with each other three assays for CD19 CAR-T cell detection, all based on commercially available reagents. All methods used a recombinant human CD19 protein fragment recognized by the single-chain variable fragment of the CAR construct. The two indirect staining assays (CD19his + APC-conjugated antihistidine antibody and CD19bio + APC-conjugated antibiotin antibody) showed better sensitivity and specificity compared with the direct staining with CD19-FITC, and CD19his had a better cost-effective profile. We validated CAR detection with CD19his with parallel quantitative real-time polymerase chain reaction data and we could demonstrate a strong positive correlation. We also showed that CD19his staining can be easily included in a multicolor flow cytometry panel to achieve additional information about the cell phenotype of CAR-T cell positive subpopulations. Finally, this method can be used for different anti-CD19 CAR-T cell products and for different sample sources. These data demonstrate that detection of CAR-T cells by CD19his flow cytometry staining is a reliable, robust, and broadly applicable tool for in vivo monitoring of CAR-T cells.
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Affiliation(s)
- Silvia Zaninelli
- Division of Hematology, Center of Cellular Therapy "G. Lanzani", ASST Papa Giovanni XXIII Hospital, Bergamo, Italy
| | - Cristian Meli
- Hematology and Bone Marrow Transplant Unit, ASST Papa Giovanni XXIII Hospital, Bergamo, Italy
- Master of Science Programme in Biology Applied to Research in Biomedicine, Facoltà di Scienze e Tecnologie, Università degli Studi di Milano, Milan, Italy
| | - Gianmaria Borleri
- Hematology and Bone Marrow Transplant Unit, ASST Papa Giovanni XXIII Hospital, Bergamo, Italy
| | - Michele Quaroni
- Laboratory of Cell and Gene Therapy Stefano Verri, Fondazione IRCCS San Gerardo dei Tintori, Monza, Italy
- M. Tettamanti Center, Fondazione IRCCS San Gerardo dei Tintori, Monza, Italy
| | - Chiara Pavoni
- Hematology and Bone Marrow Transplant Unit, ASST Papa Giovanni XXIII Hospital, Bergamo, Italy
| | - Giuseppe Gaipa
- Laboratory of Cell and Gene Therapy Stefano Verri, Fondazione IRCCS San Gerardo dei Tintori, Monza, Italy
- M. Tettamanti Center, Fondazione IRCCS San Gerardo dei Tintori, Monza, Italy
| | - Andrea Biondi
- Laboratory of Cell and Gene Therapy Stefano Verri, Fondazione IRCCS San Gerardo dei Tintori, Monza, Italy
- M. Tettamanti Center, Fondazione IRCCS San Gerardo dei Tintori, Monza, Italy
- Department of Pediatrics, University of Milano - Bicocca, Monza, Italy
| | - Martino Introna
- Division of Hematology, Center of Cellular Therapy "G. Lanzani", ASST Papa Giovanni XXIII Hospital, Bergamo, Italy
| | - Josée Golay
- Division of Hematology, Center of Cellular Therapy "G. Lanzani", ASST Papa Giovanni XXIII Hospital, Bergamo, Italy
| | - Alessandro Rambaldi
- Hematology and Bone Marrow Transplant Unit, ASST Papa Giovanni XXIII Hospital, Bergamo, Italy
- Department of Oncology and Hematology, Università degli Studi di Milano, Milan, Italy
| | - Benedetta Rambaldi
- Hematology and Bone Marrow Transplant Unit, ASST Papa Giovanni XXIII Hospital, Bergamo, Italy
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