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Extracellular vesicles in human semen modulate antigen-presenting cell function and decrease downstream antiviral T

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This summary is machine-generated.

Human semen extracellular vesicles (SEV) suppress T cell immune responses by affecting antigen-presenting cells. These SEV may normally prevent immune reactions to semen but can be exploited by viral infections.

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Area of Science:

  • Immunology
  • Cell Biology
  • Virology

Background:

  • Human semen contains trillions of extracellular vesicles (SEV) comparable in size to viruses.
  • SEV are known to inhibit HIV and Zika virus infectivity.
  • The impact of SEV on subsequent immune responses remains largely unknown.

Purpose of the Study:

  • To investigate the effect of SEV on antigen-presenting cell (APC) function.
  • To determine the impact of SEV on downstream T cell responses.
  • To elucidate the mechanisms by which SEV modulate immune cell interactions.

Main Methods:

  • SEV were characterized for their interaction with APCs.
  • APC-T cell co-culture systems were used to assess T cell activation.
  • Flow cytometry and functional assays measured cytokine production, degranulation, and cytotoxicity.

Main Results:

  • SEV efficiently bound to and entered APCs.
  • SEV exposure to APCs alone reduced antigen-specific CD8+ T cell responses (cytokine production, degranulation, cytotoxicity).
  • SEV upregulated indoleamine 2,3-dioxygenase (IDO) in APCs, inhibiting T cell activation without altering MHC or co-stimulatory molecule expression.

Conclusions:

  • SEV possess immune-inhibitory properties that reduce APCs' ability to activate T cells.
  • These properties may prevent immune responses against semen-derived antigens.
  • Genitally acquired viral infections could exploit SEV to compromise adaptive cellular immunity.