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Human yeast-specific CD8 T lymphocytes show a nonclassical effector molecule profile

Tanja Breinig1, Nicoletta Scheller, Birgit Glombitza

  • 1Junior Research Group for Virology/Immunology, Saarland University, 66421, Homburg, Germany. breinig@cs.uni-saarland.de

Medical Microbiology and Immunology
|September 28, 2011
PubMed

Insights

Researchers discovered a unique type of CD8 T cell in healthy individuals that targets yeast and fungi. These cells use granulysin, an antifungal molecule, to eliminate fungal pathogens, highlighting a novel defense mechanism against mycoses.

Area of Science:

  • Immunology
  • Microbiology
  • Cellular Biology

Background:

  • Pathogenic yeasts and fungi cause diverse human infections, from skin mycosis to life-threatening sepsis.
  • Cell-mediated immunity is crucial for controlling fungal infections, but antifungal effector cell mechanisms remain unclear.
  • Healthy individuals possess yeast-specific CD8 T lymphocytes, yet their precise function is not fully understood.

Purpose of the Study:

  • To directly analyze yeast-specific CD8 T lymphocytes in whole blood from healthy individuals.
  • To characterize the phenotype and effector molecules of these antifungal CD8 T cells.
  • To elucidate the defense mechanisms employed by these cells against fungal pathogens.

Main Methods:

  • Direct analysis of yeast-specific CD8 T lymphocytes in whole blood.
  • Phenotypic characterization including expression of effector molecules.
  • Stimulation assays using yeast and dendritic cells.
  • Analysis of degranulation and granule content after stimulation and cultivation.

Main Results:

  • Yeast-specific CD8 T cells exhibit a nonclassical phenotype, expressing granulysin and granzyme K, not perforin and granzyme B.
  • These cells degranulate upon stimulation and refill granules with granulysin.
  • Dendritic cell-mediated stimulation, but not yeast cells alone, induced effector cell degranulation.

Conclusions:

  • Yeast-specific CD8 T cells represent a nonclassical effector population with a unique antimicrobial machinery.
  • Granulysin, known for its antifungal properties, is the key effector molecule used by these cells.
  • This suggests a specialized defense mechanism tailored for efficient elimination of fungi as pathogens.

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