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Oral administration of a streptococcal agent OK-432 activates peritoneal macrophages in mice
I Suzuki1, A Kinoshita, H Tanaka
1Laboratory of Immunopharmacology of Microbial Products, Tokyo College of Pharmacy, Japan.
Abstract:
The effect of orally administered OK-432, a streptococcal preparation, on the function of peritoneal macrophages in mice was examined. The administration of OK-432 orally (1 KE or 2 KE, four times every three days) did not affect the numbers of both total peritoneal cells and macrophages recovered five days after the final administration. However, the macrophages exhibited an increase in their spreading ability. Other functions of the peritoneal macrophages including lysosomal enzyme activity, phagocytic activity and interleukin 1 (IL-1) production were also enhanced significantly by the oral administration of OK-432 (1 KE or 2 KE). The production of H2O2, however, was not affected by the same treatment with OK-432. The activation of peritoneal macrophages by orally administered OK-432 reported here may contribute to expansion of the clinical application of this drug.
Insights
Oral administration of OK-432, a streptococcal preparation, enhances peritoneal macrophage function in mice. This immune activation, including increased spreading and interleukin-1 production, suggests potential for broader clinical applications.
Area of Science:
- Immunology
- Pharmacology
- Microbiology
Background:
- OK-432 is a streptococcal preparation with known immunomodulatory effects.
- Peritoneal macrophages play a crucial role in innate immunity and host defense.
- Understanding the impact of oral OK-432 on macrophage function is essential for its therapeutic development.
Purpose of the Study:
- To investigate the effects of orally administered OK-432 on the functional capacity of murine peritoneal macrophages.
- To determine if oral OK-432 influences macrophage numbers, spreading ability, lysosomal enzyme activity, phagocytosis, IL-1 production, and H2O2 generation.
Main Methods:
- Mice were orally administered OK-432 at doses of 1 KE or 2 KE, four times every three days.
- Peritoneal cells and macrophages were recovered five days after the final administration.
- Macrophage functions including spreading, lysosomal enzyme activity, phagocytosis, IL-1, and H2O2 production were assessed.
Main Results:
- Oral OK-432 did not alter the total number of peritoneal cells or macrophages.
- Significant enhancements were observed in macrophage spreading ability, lysosomal enzyme activity, phagocytic activity, and interleukin-1 (IL-1) production.
- Hydrogen peroxide (H2O2) production by macrophages remained unaffected by oral OK-432 treatment.
Conclusions:
- Oral administration of OK-432 effectively activates peritoneal macrophages in mice, enhancing key immune functions.
- The observed macrophage activation suggests that OK-432 holds promise for expanded clinical applications.
- Further research into the mechanisms and therapeutic potential of orally administered OK-432 is warranted.