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[Effect of lysozyme on the surface structures of mouse peritoneal macrophages]
Abstract:
Surface structures of the peritoneal macrophages of BALB/c mice treated intramuscularly with various doses of egg lysozyme (0.05 to 50 mg/kg) were studied with scanning electron microscopy. It was shown that the effect of lysozyme on the macrophages significantly depended on the dose of the preparation and the frequency of its use. When used in the subtherapeutic (0.5 mg/kg) and therapeutic (5 mg/kg) single doses, lysozyme promoted detection of heterogeneity of the macrophage population, marked activation of their surface membranes and intensification of intercellular cooperation. The highest level of the lysozyme activating effect on the minor macrophages and lymphocytes was observed after administration of the preparation in a single dose of 5 mg/kg or in a dose of 0.5 mg/kg repeatedly (daily for 7 days). When used in a dose of 5 mg/kg repeatedly or especially in a single dose of 50 mg/kg lysozyme induced smoothing of the surface of the macrophages and lymphocytes. The problems of indirect, direct and immune activation of the macrophages with lysozyme are discussed.
Insights
Egg lysozyme dose impacts peritoneal macrophage activation. Lower doses (0.5-5 mg/kg) enhance macrophage surface activity and cooperation, while higher doses (50 mg/kg) smooth surfaces.
Area of Science:
- Immunology
- Cell Biology
- Biochemistry
Background:
- Macrophages are critical immune cells involved in host defense.
- Lysozyme, an enzyme found in egg white, has known antimicrobial properties.
- Understanding lysozyme's immunomodulatory effects on macrophages is important for therapeutic applications.
Purpose of the Study:
- To investigate the dose-dependent effects of egg lysozyme on the surface structures of peritoneal macrophages.
- To determine how varying doses and administration frequencies of lysozyme influence macrophage activation and intercellular communication.
Main Methods:
- BALB/c mice were administered varying doses of egg lysozyme (0.05 to 50 mg/kg) intramuscularly.
- Scanning electron microscopy was employed to examine the surface morphology of peritoneal macrophages.
- Effects were analyzed based on dose and frequency of lysozyme administration.
Main Results:
- Lysozyme's impact on macrophages was significantly dependent on dose and frequency.
- Sub-therapeutic (0.5 mg/kg) and therapeutic (5 mg/kg) single doses increased macrophage heterogeneity, surface membrane activation, and intercellular cooperation.
- Optimal activation of macrophages and lymphocytes occurred with a single 5 mg/kg dose or repeated 0.5 mg/kg doses.
- High doses (5 mg/kg repeated or 50 mg/kg single) led to surface smoothing of macrophages and lymphocytes.
Conclusions:
- Egg lysozyme exhibits dose-dependent immunomodulatory effects on peritoneal macrophages.
- Specific dosages can enhance macrophage activation and immune cell interactions, suggesting potential therapeutic roles.
- Higher lysozyme concentrations may lead to immunosuppressive effects by altering cell surface morphology.