Characterizing the mechanisms underpinning interleukin-15Rα-mediated protection against sepsis and candidiasis

Area of Science:

• Immunology
• Infectious Diseases

Background:

• The interleukin-15 receptor alpha (IL-15Rα) plays a protective role in sepsis and candidiasis by binding its ligand, IL-15.
• The precise mechanisms underlying IL-15Rα's function in these conditions are not fully understood.

Purpose of the Study:

• To confirm the protective effects of IL-15 in sepsis and candidiasis.
• To elucidate the specific roles of IL-15Rα in the treatment of these infections.

Main Methods:

• Confirmation of IL-15 protective effects using clinical samples from sepsis and candidiasis patients.
• Therapeutic administration of IL-15 to IL-15Rα-deficient mice to assess receptor necessity.
• Evaluation of infection-induced mortality, organ damage, microbial burden, and macrophage function.

Main Results:

• Bacterial and fungal infections led to increased mortality, organ damage, higher microbial loads, and impaired macrophage function.
• Recombinant IL-15 supplementation alleviated these adverse effects in wild-type mice.
• IL-15 treatment did not improve conditions in IL-15Rα-deficient mice, demonstrating the receptor's essential role.

Conclusions:

• IL-15Rα is indispensable for protection against both bacterial and fungal sepsis.
• Targeting IL-15Rα presents a promising therapeutic strategy for clinical sepsis treatment with significant potential value.