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Long-Term Follow-up Study of Subjects Treated With Autologous T Cells Using the Sleeping Beauty System to Express TCRs

ABSTRACT: Long-Term Follow-Up Study for Subjects Enrolled in the Phase I/II Study of Autologous T Cells Engineered using the Sleeping Beauty System to Express T cell Receptors (TCRs) Reactive Against Cancer-specific Mutations in Subjects with Solid Tumors

DISEASE(S): Ovarian Cancer,Squamous Cell Lung Cancer,Gynecologic Cancer,Adenosquamous Cell Lung Cancer,Colorectal Cancer,Non-small Cell Lung Cancer,Pancreatic Cancer,Ovarian Neoplasms,Adenocarcinoma Of Lung,Lung Neoplasms,Cholangiocarcinoma,Ovary Neoplasm

PROVIDER: 2710397 | ecrin-mdr-crc |

REPOSITORIES: ECRIN MDR

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Project description:Dozens of transplants generated from pluripotent stem cells are currently in clinical trials. The creation of patient-specific iPSCs makes personalized therapy possible due to their main advantage of immunotolerance. However, some reports have claimed recently that aberrant gene expression followed by proteome alterations and neoantigen formation can result in iPSCs recognition by autologous T-cells. Meanwhile, the possibility of NK-cell activation has not been previously considered. This study focused on the comparison of autologous and allogeneic immune response to iPSC-derived cells and isogeneic parental somatic cells used for reprogramming. Here we report that cells differentiated from iPSCs can be recognized by NK-cells rather than by autologous T-cells. We observed that iPS-fibro elicited a high level of NK-cell degranulation and cytotoxicity, while isogeneic parental skin fibroblasts used to obtain iPSCs barely triggered an NK-cell response. iPSC-derivatives with B2M knockout did not cause an additional increase in NK-cell activation, although they were devoid of HLA-I, the major inhibitory molecules for NK-cells. Transcriptome analysis revealed a significant imbalance of ligands for activating and inhibitory NK-cell receptors in iPS-fibro. Compared to parental fibroblasts, iPSC-derivatives had a reduced expression of HLA-I simultaneously with an increased gene expression of major activating ligands, such as MICA, NECTIN2, and PVR. The lack of inhibitory signals might be due to insufficient maturity of cells differentiated from iPSCs. In addition, we showed that pretreatment of iPS-fibro with proinflammatory cytokine IFNγ restored the ligand imbalance, thereby reducing the degranulation and cytotoxicity of NK-cells. In summary, we showed that iPSC-derived cells can be sensitive to the cytotoxic potential of autologous NK-cells regardless of HLA-I status. Thus, the balance of ligands for NK-cell receptors should be considered prior to iPSC-based cell therapies.

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Long-Term Follow-up Study of Subjects Treated With Autologous T Cells Using the Sleeping Beauty System to Express TCRs

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