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Investigating the Effects of Probiotics on Pneumococcal Colonization Using an In Vitro Adherence Assay
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Immune pathways that regulate neutrophil activation and replenishment prevent persistent pneumococcal colonization.

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Immune pathways involving IL-17RA and IL-1R are crucial for controlling Streptococcus pneumoniae colonization. These pathways ensure neutrophil replenishment and activation, preventing prolonged infection in the upper airway.

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Area of Science:

  • Immunology
  • Microbiology
  • Infectious Disease

Background:

  • Streptococcus pneumoniae (Spn) colonization of the upper airway is common but can lead to transmission and invasive disease.
  • Mechanisms preventing long-term Spn persistence are not fully understood.
  • IL-17RA and IL-1R signaling pathways are investigated for their role in controlling Spn colonization.

Purpose of the Study:

  • To investigate the roles of IL-17RA and IL-1R signaling pathways in preventing persistent Streptococcus pneumoniae colonization.
  • To elucidate the specific contributions of each pathway to immune responses against Spn.

Main Methods:

  • Utilized a mouse model of Spn colonization.
  • Employed RNA-sequencing to analyze gene expression changes.
  • Assessed neutrophil recruitment, trafficking, and activation.

Main Results:

  • IL-17RA signaling is essential for replenishing neutrophils in nasal tissue, promoting their trafficking from circulation.
  • IL-1R signaling activates neutrophils, enhancing their phagocytic capacity via CD11b.
  • Absence of either pathway led to persistent Spn colonization, with a combined effect when both were absent.

Conclusions:

  • Sustained neutrophil presence and activity are critical for preventing persistent mucosal infections by Spn.
  • Distinct IL-17RA and IL-1R pathways cooperate to control Spn colonization by regulating neutrophil recruitment and function.