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In Vivo Immunogenicity Screening of Tumor-Derived Extracellular Vesicles by Flow Cytometry of Splenic T Cells
Published on: September 23, 2021
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Extracellular vesicle-mediated immunoregulation in cancer
Tomofumi Yamamoto1,2, Yusuke Yamamoto2, Takahiro Ochiya3
1Department of Molecular and Cellular Medicine, Institute of Medical Science, Tokyo Medical University, 6-7-1, Nishishinjuku, Shinjuku-ku, Tokyo, 160-0023, Japan.
International Journal of Hematology
|August 11, 2022
Summary
Extracellular vesicles (EVs) regulate tumor immunity. Suppressing EV secretion boosts immunotherapy, while CAR-T cell-derived EVs offer a novel therapeutic approach by bypassing immune checkpoints.
Area of Science:
- Oncology
- Immunology
- Cell Biology
Background:
- Extracellular vesicles (EVs) are key regulators of tumor progression and immune responses.
- EVs carry diverse molecules (DNA, RNA, proteins) that modulate recipient cell functions.
- Immune checkpoint proteins like PD-L1 on EVs significantly impact tumor immunity.
Purpose of the Study:
- To review the current understanding of extracellular vesicles (EVs) in cancer immunity.
- To summarize the critical roles of EVs in tumor immunomodulation.
- To explore the therapeutic potential of EVs in cancer treatment.
Main Methods:
- Literature review of studies on EVs, cancer immunity, and immunotherapy.
- Analysis of the mechanisms by which EVs influence immune responses.
- Examination of the role of PD-L1 on EVs in immune evasion.
- Investigation of chimeric antigen receptor T (CAR-T) cell-derived EVs.
Main Results:
- EVs, particularly those expressing PD-L1, play a crucial role in immune suppression during cancer.
- Reducing EV secretion enhances the effectiveness of immune checkpoint blockade therapies.
- CAR-T cell-derived EVs express CAR and lack PD1, suggesting potential for sustained antitumor activity.
- EVs are versatile mediators of intercellular communication in the tumor microenvironment.
Conclusions:
- EVs are central players in cancer immunity, influencing both tumor progression and response to therapy.
- Targeting EV secretion or utilizing engineered EVs presents promising avenues for cancer immunotherapy.
- CAR-T-cell-derived EVs represent a novel strategy to overcome limitations of current immunotherapies.
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