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Depression of phagocytic activity of human polymorphonuclear leukocytes by methyl linoleate hydroperoxides
1Research Center for Pathogenic Fungi and Microbial Toxicoses, Chiba University, Japan.
Abstract:
Methyl linoleate hydroperoxides (MLHPO), a model for lipid hydroperoxides, decreased fungicidal activity of human polymorphonuclear leukocytes (PMN) for fungi of Candida albicans. When PMN was cultured with MLHPO, phagocytosis to fungi was depressed. Degree of the depression was dependent on the concentration of MLHPO and the treatment time with MLHPO. These findings indicate that phagocytic activity of human PMN can be depressed by lipid hydroperoxides.
Insights
Methyl linoleate hydroperoxides (MLHPO) impair the ability of human polymorphonuclear leukocytes (PMN) to fight Candida albicans. This study shows MLHPO reduces PMN phagocytosis, impacting immune defense.
Area of Science:
- Immunology
- Biochemistry
- Mycology
Background:
- Lipid hydroperoxides are products of lipid oxidation.
- Candida albicans is an opportunistic fungal pathogen.
- Polymorphonuclear leukocytes (PMN) are key immune cells.
Purpose of the Study:
- To investigate the effect of methyl linoleate hydroperoxides (MLHPO) on the fungicidal activity of human PMN against Candida albicans.
- To determine if MLHPO affects the phagocytic capacity of PMN.
Main Methods:
- Human PMN were cultured with varying concentrations of MLHPO for different durations.
- Fungicidal activity and phagocytosis of Candida albicans by PMN were assessed.
Main Results:
- MLHPO significantly decreased the fungicidal activity of PMN against Candida albicans.
- Phagocytosis of Candida albicans by PMN was depressed in a dose- and time-dependent manner with MLHPO exposure.
- The degree of phagocytic depression correlated with MLHPO concentration and treatment time.
Conclusions:
- Lipid hydroperoxides, using MLHPO as a model, can depress the phagocytic activity of human PMN.
- This depression of phagocytosis may contribute to reduced fungicidal activity against Candida albicans.
- These findings highlight a potential mechanism by which oxidative stress impacts innate immunity.