Protective effect of nonspecific immunostimulation in postsplenectomy sepsis

Area of Science:

• Immunology
• Microbiology
• Pharmacology

Background:

• Splenectomy increases the risk of severe sepsis, particularly pneumococcal infections.
• Current prophylactic measures like antibiotics and vaccines show limited success in preventing postsplenectomy sepsis.
• There is a need for novel strategies to mitigate postsplenectomy infection risks.

Purpose of the Study:

• To evaluate glucan, a beta-1,3-polyglucose, as a nonspecific immunostimulant against postsplenectomy pneumococcal sepsis.
• To assess the impact of glucan on survival rates and immune function in splenectomized mice challenged with Streptococcus pneumoniae.

Main Methods:

• ICR mice underwent splenectomy or sham operation and were treated with glucan or glucose.
• Mice were intranasally challenged with Streptococcus pneumoniae.
• Survival rates, phagocytic function (using 131I-triolein-labeled lipid emulsion), and leukocytosis were measured.

Main Results:

• Glucan treatment significantly increased survival in splenectomized mice challenged with pneumococcal sepsis (75% vs. 27% in controls).
• Glucan enhanced phagocytic function compared to glucose controls, irrespective of pneumococcal infection.
• Splenectomized, glucan-treated animals exhibited increased leukocytosis in response to infection.

Conclusions:

• Nonspecific immunostimulation with glucan shows significant potential as a therapeutic strategy for postsplenectomy infections.
• Glucan effectively bolsters immune defenses against Streptococcus pneumoniae in the absence of a spleen.
• Further research into glucan as an adjunct therapy for asplenic patients is warranted.