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Specific Decrease in B-Cell-Derived Extracellular Vesicles Enhances Post-Chemotherapeutic CD8+ T Cell Responses.

Fanghui Zhang1, Rongrong Li2, Yunshan Yang3

  • 1Institute of Immunology and Department of Orthopaedics of the Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou 310009, China; Institute of Immunology and Bone Marrow Transplantation Center of the First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou 310058, China; Institute of Hematology, Zhejiang University & Zhejiang Engineering Laboratory for Stem Cell and Immunotherapy, Hangzhou 310006, China.

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|February 17, 2019
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Summary
This summary is machine-generated.

B cell-derived extracellular vesicles (EVs) carrying CD19, CD39, and CD73 proteins impair chemotherapy by converting ATP to adenosine, hindering T cell responses. Reducing these EVs enhances chemotherapy

Keywords:
B cellsCD19CD39CD73HIF-1αRab27acancerchemotherapyextracellular vesicles

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Area of Science:

  • Immunology
  • Cancer Biology
  • Extracellular Vesicles Research

Background:

  • Systemic immunosuppression negatively impacts chemotherapy effectiveness.
  • Extracellular vesicles (EVs) play a role in immune modulation and cancer progression.

Purpose of the Study:

  • To investigate the mechanism by which B cell-derived EVs affect chemotherapy outcomes.
  • To identify potential therapeutic targets for enhancing chemotherapeutic efficacy.

Main Methods:

  • Analysis of CD19+ EVs in tumor-bearing mice and patients.
  • Investigating the role of CD39 and CD73 in EV-mediated immunosuppression.
  • Examining the influence of hypoxia-inducible factor-1α (HIF-1α) and Rab27a on EV production.
  • Utilizing Rab27a siRNA delivered by inactivated Epstein-Barr virus in a humanized mouse model.

Main Results:

  • CD19+ EVs from B cells hydrolyze ATP to adenosine via CD39/CD73, suppressing CD8+ T cell responses.
  • Increased serum CD19+ EVs correlate with poorer chemotherapy prognosis.
  • HIF-1α upregulates Rab27a, promoting CD19+ EV release.
  • Deficiency in Rab27a or HIF-1α in B cells enhances chemotherapy efficacy.
  • Silencing Rab27a in B cells significantly improves chemotherapy in vivo.

Conclusions:

  • B cell-derived CD19+ EVs contribute to chemotherapy resistance by inducing immunosuppression.
  • Targeting CD19+ EV production, particularly via the HIF-1α/Rab27a pathway, is a promising strategy to improve cancer chemotherapy.