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TLT-1 Promotes Platelet-Monocyte Aggregate Formation to Induce IL-10-Producing B Cells in Tuberculosis.

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Platelet-monocyte aggregates (PMAs) increase in active tuberculosis (TB). Triggering receptors expressed on myeloid cells (TREMs)-like transcript-1 (TLT-1) drives PMA formation and cytokine release, impacting B10 cell polarization in TB patients.

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Area of Science:

  • Immunology
  • Hematology
  • Infectious Diseases

Background:

  • Platelet-monocyte aggregates (PMAs) and their immunoregulatory roles are gaining attention.
  • The specific involvement of PMAs in tuberculosis (TB) pathogenesis requires further investigation.

Purpose of the Study:

  • To elucidate the role of PMAs and triggering receptors expressed on myeloid cells (TREMs)-like transcript-1 (TLT-1) in active TB.
  • To investigate the impact of PMAs on cytokine production and B cell polarization in TB.

Main Methods:

  • Quantification of CD14+CD41+ PMAs in peripheral blood of active TB patients.
  • In vitro studies assessing platelet-monocyte aggregation and cytokine production.
  • Assessment of TLT-1 expression and function using TLT-1 fusion protein (TLT-1 Fc).
  • Coculture systems to evaluate PMA-mediated B cell polarization.

Main Results:

  • Elevated levels of CD14+CD41+ PMAs expressing TLT-1, P-selectin (CD62P), and CD40L were observed in active TB patients.
  • TB patient platelets induced IL-1β and IL-6 production from monocytes via aggregation.
  • TLT-1 was essential for PMA formation; blocking TLT-1-ligand interaction reduced PMA formation and pro-inflammatory cytokine release.
  • PMAs promoted B10 cell polarization, dependent on IL-1β, IL-6, and CD40L.
  • TLT-1 Fc treatment suppressed B10 polarization by inhibiting PMA formation.

Conclusions:

  • TLT-1 promotes PMA formation and subsequent IL-1β, IL-6, and CD40L production.
  • PMAs enhance B10 cell polarization through TLT-1-mediated signaling.
  • Targeting the TLT-1 pathway may offer novel therapeutic strategies for TB.