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Complex surveillance of Streptococcus pyogenes V. Protective features complex surveillance of streptococcus of
Abstract:
Exoproducts of incubated white blood elements from persons hypersensitive to zymosan were found to promote the phagocytic activity of human microphages (and guinea pig macrophages) under conditions of a combined model of "MIF-opsonophagocytic test". The stimulation resulted in a bacteriostatic effect, was non-type-specific and improved microphage potential to inactivate streptococci opsonized with anti-M antibodies in low titre. The microphages pre-exposed to anti-M sera remained unaffected, the effect was non-species-specific and nontype-specific and the stimulation resulted from the action of albumin fraction exoproducts. This seems to suggest that human mediators (lymphokines) may promote the activity of phagocytes. The cell-mediated immunity appears thus to have protective features even in the case of streptococci which are the typical extracellular parasites. The drawbacks of the model used, which make it difficult to quantify the found mechanism under in vivo conditions, are discussed in detail.
Insights
White blood cell exoproducts enhance macrophage phagocytosis, improving their ability to fight streptococci. This suggests cell-mediated immunity offers protection against extracellular parasites like streptococci.
Area of Science:
- Immunology
- Cell Biology
Background:
- Phagocytic activity is crucial for innate and adaptive immunity.
- Understanding factors that enhance phagocytosis is key to developing new therapeutic strategies.
Purpose of the Study:
- To investigate the effect of white blood cell exoproducts on macrophage phagocytic activity.
- To determine if these exoproducts can enhance the inactivation of Streptococcus bacteria.
Main Methods:
- Utilized a combined MIF-opsonophagocytic test model.
- Incubated white blood elements from zymosan-hypersensitive individuals.
- Assessed the effect of exoproducts on human and guinea pig macrophages.
Main Results:
- Exoproducts significantly promoted macrophage phagocytic activity.
- A non-type-specific bacteriostatic effect was observed, enhancing streptococci inactivation.
- Albumin fraction exoproducts were identified as the active component, suggesting lymphokine involvement.
Conclusions:
- Cell-mediated immunity, potentially through lymphokines, can enhance phagocyte activity against extracellular parasites.
- This mechanism offers protective features against bacteria like Streptococcus.
- The study highlights the potential of exoproducts in modulating immune responses.