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Circulating Exosomes Inhibit B Cell Proliferation and Activity.

Jan C Schroeder1, Lisa Puntigam1, Linda Hofmann1

  • 1Department of Otorhinolaryngology and Head and Neck Surgery, Ulm University, 89075 Ulm, Germany.

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Summary
This summary is machine-generated.

Circulating exosomes inhibit B cell function, impacting anti-tumor immunity in head and neck squamous cell carcinoma (HNSCC). These exosomes reduce B cell proliferation and survival, suggesting a physiological role in immune suppression.

Keywords:
B cellsBruton’s tyrosine kinaseHead and Neck Cancerexosomes

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Area of Science:

  • Immunology
  • Oncology
  • Cell Biology

Background:

  • Head and neck squamous cell carcinoma (HNSCC) is associated with suppressed anti-tumor immunity.
  • Tumor-derived exosomes contribute to immune suppression by affecting T cells.
  • The impact of exosomes on B cells in HNSCC remains largely unexplored.

Purpose of the Study:

  • To investigate the effects of exosomes on B cell function in HNSCC.
  • To analyze checkpoint receptor expression on B cells from HNSCC patients.
  • To determine the influence of circulating exosomes on B cell proliferation, survival, and signaling.

Main Methods:

  • Peripheral B cells isolated from healthy donors and HNSCC patients.
  • Circulating exosomes isolated from plasma using mini size-exclusion chromatography.
  • Co-culture of healthy B cells with exosomes, followed by flow cytometry analysis of proliferation, viability, checkpoint receptors, and intracellular signaling.

Main Results:

  • Increased expression of PD-1 and LAG3 checkpoint receptors on B cells from HNSCC patients.
  • Elevated protein concentration of circulating exosomes in HNSCC patients.
  • Exosomes from both HNSCC patients and healthy donors inhibited B cell proliferation and survival in vitro.
  • Exosomes modulated surface expression of checkpoint receptors and inhibited B cell receptor (BCR) signaling.

Conclusions:

  • Plasma-derived exosomes exert inhibitory effects on healthy B cell function.
  • These inhibitory effects are comparable between exosomes from HNSCC patients and healthy individuals.
  • Circulating exosomes may play a physiological role in B cell-mediated immune suppression.