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Enhancement of macrophage spreading and phagocytosis by peroxidative enzymes
D Lefkowitz1, P Perez, T Jester
1Department of Biological Sciences, Texas Tech University, Lubbock 79409.
Abstract:
Macrophages stimulated by various substances exhibit altered morphology, metabolism, and enhanced phagocytosis. The present studies were done to show if peroxidative enzymes would affect macrophage spreading and phagocytosis. Resident peritoneal macrophages, collected from C57BI mice were exposed to various concentrations of peroxidases and compared with appropriate controls. Results indicated that 0.01 microM myeloperoxidase (MyPO), 0.09 microM horseradish peroxidase (HRP), 0.16 microM lactoperoxidase (LPO) and 70 microM microperoxidase (MPO) significantly enhanced macrophage spreading. It was also noted that peroxidases were able to stimulate phagocytosis by increasing the number of cells with internalized zymosan at least twofold. Stimulation of these functions suggests a possible role of endogenous peroxidases as natural cell activators.
Insights
Peroxidative enzymes like myeloperoxidase significantly enhance macrophage spreading and phagocytosis. These findings suggest endogenous peroxidases may act as natural activators of immune cells.
Area of Science:
- Immunology
- Cell Biology
- Biochemistry
Background:
- Macrophages are key immune cells with functions including phagocytosis.
- Macrophage activity is modulated by various stimuli, affecting their morphology and metabolism.
- The role of peroxidative enzymes in modulating macrophage functions requires further investigation.
Purpose of the Study:
- To investigate the effect of peroxidative enzymes on macrophage spreading and phagocytosis.
- To determine if specific peroxidases can enhance these critical macrophage functions.
Main Methods:
- Resident peritoneal macrophages were isolated from C57BI mice.
- Macrophages were exposed to varying concentrations of different peroxidases: myeloperoxidase (MyPO), horseradish peroxidase (HRP), lactoperoxidase (LPO), and microperoxidase (MPO).
- Macrophage spreading and phagocytosis of zymosan were assessed and compared to controls.
Main Results:
- Myeloperoxidase (MyPO), horseradish peroxidase (HRP), lactoperoxidase (LPO), and microperoxidase (MPO) significantly enhanced macrophage spreading at specific concentrations.
- Peroxidases stimulated phagocytosis, at least doubling the number of cells internalizing zymosan.
- The observed effects were concentration-dependent for each enzyme tested.
Conclusions:
- Peroxidative enzymes can significantly enhance macrophage spreading and phagocytic activity.
- These findings suggest a potential role for endogenous peroxidases as natural activators of macrophages.
- Further research could explore the therapeutic implications of modulating peroxidase activity in immune responses.