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A Novel Car Expressing Nk Cell Targeting Cd25 With the Prospect of Overcoming Immune Escape Mechanism in Cancers Publisher



Dehbashi M1 ; Hojati Z1 ; Motovalibashi M1 ; Ganjalikhany MR2 ; Cho WC3 ; Shimosaka A4 ; Navabi P5 ; Ganjalikhanihakemi M5, 6
Authors
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Authors Affiliations
  1. 1. Division of Genetics, Department of Cell and Molecular Biology and Microbiology, Faculty of Biological Science and Technology, University of Isfahan, Isfahan, Iran
  2. 2. Division of Biochemistry, Department of Cell and Molecular Biology and Microbiology, Faculty of Biological Science and Technology, University of Isfahan, Isfahan, Iran
  3. 3. Department of Clinical Oncology, Queen Elizabeth Hospital, Hong Kong
  4. 4. Institute of Hematology, Peking Union Medical College, Beijing, China
  5. 5. Department of Immunology, Faculty of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran
  6. 6. Acquired Immunodeficiency Research Center, Isfahan University of Medical Sciences, Isfahan, Iran

Source: Frontiers in Oncology Published:2021


Abstract

For many years, high-affinity subunit of IL-2 receptor (CD25) has been considered as a promising therapeutic target for different pathologic conditions like allograft rejection, autoimmunity, and cancers. Although CD25 is transiently expressed by newly-activated T cells, it is the hallmark of regulatory T (Treg) cells which are the most important immunosuppressive elements in tumor microenvironment. Thus, Tregs can be considered as a potential target for chimeric antigen receptor (CAR)-based therapeutic approaches. On the other hand, due to some profound adverse effects pertaining to the use of CAR T cells, CAR NK cells have caught researchers’ attention as a safer choice. Based on these, the aim of this study was to design and develop a CAR NK cell against CD25 as the most prominent biomarker of Tregs with the prospect of overcoming immune escape mechanism in solid and liquid cancers. In the current study, an anti-CD25 CAR was designed and evaluated by comprehensive in silico analyses. Then, using lentiviral transduction system, NK-92 cell line was engineered to express this anti-CD25 CAR construct. In vitro functional analyses of anti-CD25 CAR for its reactivity against CD25 antigen as well as for cytotoxicity and cytokine production assays against CD25 bearing Jurkat cell line were done. In silico analyses demonstrated that the anti-CD25 CAR transcript and scFv protein structures were stable and had proper interaction with the target. Also, in vitro analyses showed that the anti-CD25 CAR-engineered NK-92 cells were able to specifically detect and lyse target cells with an appropriate cytokine production and cytotoxic activity. To conclude, the results showed that this novel CAR NK cell is functional and warrant further investigations. © Copyright © 2021 Dehbashi, Hojati, Motovali-bashi, Ganjalikhany, Cho, Shimosaka, Navabi and Ganjalikhani-Hakemi.
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