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Area of Science:

  • Immunology
  • Microbiology
  • Transplantation

Background:

  • Graft-versus-host disease (GVHD) is a major complication of allogeneic hematopoietic stem cell transplantation (allo-HSCT).
  • The role of fungal infections in modulating GVHD severity remains incompletely understood.
  • C-type lectin receptors on immune cells play critical roles in pathogen recognition and immune responses.

Purpose of the Study:

  • To investigate the mechanistic link between fungal components and GVHD severity.
  • To elucidate the role of Dectin-2 in the context of fungal exposure and allo-HSCT.
  • To understand how fungal recognition influences the lung immune environment post-allo-HSCT.

Main Methods:

  • Utilized mouse models of allo-HSCT.
  • Administered alpha-mannan (Mn), a fungal cell wall component.
  • Assessed lung chemokine environment and T helper 17 (Th17) cell accumulation.
  • Analyzed Dectin-2 expression and function on host macrophages.

Main Results:

  • Recognition of alpha-mannan by Dectin-2 on macrophages induced a pro-inflammatory lung chemokine milieu.
  • This environment promoted the accumulation of donor T helper 17 (Th17) cells.
  • Increased Th17 cell infiltration correlated with severe pulmonary GVHD following allo-HSCT.

Conclusions:

  • Fungal alpha-mannan recognition via Dectin-2 is a key mechanism linking fungal infections to severe pulmonary GVHD.
  • Host macrophage response to fungal components significantly impacts allo-HSCT outcomes.
  • These findings provide a mechanistic basis for understanding fungal infection-associated GVHD severity.