Candida albicans Quorum Sensing Molecules Stimulate Mouse Macrophage Migration

Area of Science:

• Mycology
• Immunology
• Pathogenesis

Background:

• Candida albicans is a polymorphic fungus causing severe infections in immunocompromised individuals.
• This fungus employs immune evasion strategies, interacting with macrophages in a way that promotes its survival and pathogenesis.
• Distinct cell forms (white and opaque) exhibit different interactions with host immune cells.

Purpose of the Study:

• To elucidate the physiological mechanism behind the differential interaction of Candida albicans white and opaque cells with macrophages.
• To identify the specific molecule secreted by white cells that influences macrophage behavior.

Main Methods:

• Investigated the secretion products of C. albicans white and opaque cells.
• Assayed the effect of secreted molecules on macrophage migration (chemokinesis) in vitro.
• Evaluated the in vivo effect of the identified molecule on macrophage infiltration into the peritoneal cavity.

Main Results:

• E,E-farnesol is exclusively secreted by C. albicans white cells.
• E,E-farnesol significantly stimulates macrophage chemokinesis, increasing migration up to 8.5-fold in vitro.
• E,E-farnesol promotes a 3-fold increase in peritoneal macrophage infiltration in vivo.
• Activity of E,E-farnesol is enhanced by yeast cell wall components and aromatic alcohols.

Conclusions:

• E,E-farnesol secretion by white cells is a key mechanism for C. albicans to modulate host immune response.
• This farnesol-mediated stimulation of macrophage migration may explain the commensal's success as a pathogen.
• Targeting farnesol secretion could be a strategy to enhance host immune recognition and combat C. albicans infections.