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Bacterial Quorum-Sensing Peptides as Immune Modulators Present in Systemic Circulation.

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Bacterial quorum-sensing peptides (QSPs) can activate immune cells. This study found specific QSPs modulate immunity and detected one in human plasma, revealing their potential role in host health.

Keywords:
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Area of Science:

  • Microbiology
  • Immunology
  • Bacterial communication

Background:

  • Quorum-sensing peptides (QSPs) are bacterial signaling molecules.
  • Emerging roles in microbiome-host interactions and diseases like cancer.
  • Limited understanding of their immunomodulatory potential.

Purpose of the Study:

  • Screen QSPs for immune cell activation (IL-6, TNFα).
  • Validate findings in murine and human cells.
  • Investigate the in vivo relevance of immunomodulatory QSPs.

Main Methods:

  • Screened 89 QSPs for cytokine induction in murine splenocytes and macrophages.
  • Confirmatory assays with murine splenocytes and human PBMCs.
  • UHPLC-MS/MS analysis of human plasma for QSP Q010.

Main Results:

  • Identified Q007, Q010, Q017, and Q212 as potent immune cell activators.
  • Confirmed Q007 and Q010 effects in murine and human cells.
  • Detected QSP Q010 in human plasma, indicating circulation.

Conclusions:

  • Specific QSPs possess immunomodulatory capabilities.
  • Demonstrated the presence of an immunomodulatory QSP in human circulation.
  • QSPs represent a novel class of molecules with potential immune-modulating functions.