Abstract
Chimeric antigen receptor T cells (CAR T cells) have improved the prognosis of patients with certain hematologic malignancies. However, broader clinical application of this type of therapy is dependent on production protocols. We characterized VHH-based CD19-redirected CAR T cells generated using the transduction enhancers (TEs) polybrene or retronectin. The proliferation rate of activated T cells transduced using polybrene concentrations > 6 mg/mL decreased compared with untreated group. There was a direct relationship between polybrene concentration and transduction efficacy. Moreover, we demonstrated the proliferation of retronectin-transduced T cells increased in a dose-dependent manner (4–20 μg/mL). Whereas, different retronectin concentrations did not mediate a significant increase in T cell transduction rate. Moreover, lentiviral transduction rate was also dependent on the concentration of lentiviruses. At optimized TE concentrations, multiplicity of infection (MOI) of > 10 decreased living T cell transduction rate. Additionally, we demonstrated that CAR T cell phenotype is highly affected by TE type. Naïve T cell differentiation to central memory T cell was observed in the beginning of the expansion process and effector memory T cells became the predominant subset in the second week of expansion. Importantly, retronectin increased the proliferation of CAR T cells alongside medicating higher transduction rates, resulting in more naïve and central memory T cells. We demonstrated that a higher percentage of CAR T cells were generated using retronectin (with a less differentiated phenotype) making retronectin a more effective TE than polybrene for long-term CAR T cell processing in preclinical or clinical studies.
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Acknowledgements
This work was partly supported by the National Institute for Medical Research Development (NIMAD) [Grant No. 971379 and 984179], by the Council for Development of Stem Cell Sciences and Technologies [Grant No. 9811642], and by Tarbiat Modares University of Medical Sciences, Tehran, Iran.
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FN: Data curation, Formal analysis, Investigation, Methodology, Project administration, Validation, Visualization, Writing—original draft. SM: Formal analysis, Methodology. FR: Conceptualization, Data curation, Formal analysis, Funding acquisition, Methodology, Project administration, Resources, Software, Supervision, Validation. All authors reviewed the manuscript.
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Nasiri, F., Muhammadnejad, S. & Rahbarizadeh, F. Effects of polybrene and retronectin as transduction enhancers on the development and phenotypic characteristics of VHH-based CD19-redirected CAR T cells: a comparative investigation. Clin Exp Med 23, 2535–2549 (2023). https://doi.org/10.1007/s10238-022-00928-8
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DOI: https://doi.org/10.1007/s10238-022-00928-8