| Literature DB >> 33388419 |
Michelle J Cox1, Fabrice Lucien2, Reona Sakemura3, Justin C Boysen4, Yohan Kim2, Paulina Horvei5, Claudia Manriquez Roman6, Michael J Hansen7, Erin E Tapper3, Elizabeth L Siegler3, Cynthia Forsman8, Sydney B Crotts9, Kendall J Schick10, Mehrdad Hefazi3, Michael W Ruff11, Ismail Can12, Mohamad Adada13, Evandro Bezerra13, Lionel Aurelien Kankeu Fonkoua13, Wendy K Nevala7, Esteban Braggio14, Wei Ding4, Sameer A Parikh4, Neil E Kay15, Saad S Kenderian16.
Abstract
Chimeric antigen receptor (CAR) T cell therapy has yielded unprecedented outcomes in some patients with hematological malignancies; however, inhibition by the tumor microenvironment has prevented the broader success of CART cell therapy. We used chronic lymphocytic leukemia (CLL) as a model to investigate the interactions between the tumor microenvironment and CART cells. CLL is characterized by an immunosuppressive microenvironment, an abundance of systemic extracellular vesicles (EVs), and a relatively lower durable response rate to CART cell therapy. In this study, we characterized plasma EVs from untreated CLL patients and identified their leukemic cell origin. CLL-derived EVs were able to induce a state of CART cell dysfunction characterized by phenotypical, functional, and transcriptional changes of exhaustion. We demonstrate that, specifically, PD-L1+ CLL-derived EVs induce CART cell exhaustion. In conclusion, we identify an important mechanism of CART cell exhaustion induced by EVs from CLL patients.Entities:
Keywords: CART cell exhaustion; chimeric antigen receptor T cells; chronic lymphocytic leukemia; extracellular vesicles; microenvironment
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Year: 2021 PMID: 33388419 PMCID: PMC8058445 DOI: 10.1016/j.ymthe.2020.12.033
Source DB: PubMed Journal: Mol Ther ISSN: 1525-0016 Impact factor: 11.454