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Resistance to candidiasis and macrophage activity in chitin-treated mice
A Rementería1, F Abaitua, R García-Tobalina
1Departamento de Immunología, Microbiología y Parasitología, Universidad del País Vasco, Bilbao, Spain.
Abstract:
The effect of chitin, a polysaccharide of the cell wall of Candida albicans, on both the survival of C. albicans infected mice and the activity of the murine peritoneal macrophages has been studied. Pretreatment of mice with 30 mg kg(-1) C. albicans chitin enhanced the survival of the infected animals. The protective effect was concomitant with an enhancement of both phagocytic and candidacidal activities of the peritoneal macrophages. Chitin by itself did not induce the nitric oxide (NO) synthase in the macrophages, which remained at a level similar to that shown by the macrophages from untreated animals. The administration of 10 mg kg(-1) C. albicans chitin diminished the long term survival of the infected animals. This effect was coincident with a lower candidacidal activity and NO production by the macrophages of the chitin treated and infected animals, compared to the untreated infected animals.
Insights
Chitin from Candida albicans impacts survival in infected mice. Moderate chitin doses enhance survival by boosting macrophage activity, while higher doses decrease survival and immune response.
Area of Science:
- Immunology
- Microbiology
- Biochemistry
Background:
- Candida albicans is an opportunistic fungal pathogen.
- Chitin is a major component of the fungal cell wall.
- The immunomodulatory effects of chitin are not fully understood.
Purpose of the Study:
- To investigate the effect of Candida albicans chitin on the survival of infected mice.
- To evaluate the impact of chitin on murine peritoneal macrophage activity.
Main Methods:
- Mice were infected with Candida albicans.
- Mice were pretreated with different doses of Candida albicans chitin.
- Murine peritoneal macrophages were isolated and their phagocytic and candidacidal activities were assessed.
- Nitric oxide (NO) production by macrophages was measured.
Main Results:
- Pretreatment with 30 mg/kg chitin enhanced survival of infected mice.
- This enhanced survival correlated with increased macrophage phagocytic and candidacidal activities.
- Administration of 10 mg/kg chitin diminished long-term survival.
- Lower doses of chitin led to reduced macrophage candidacidal activity and NO production.
Conclusions:
- Chitin from Candida albicans exhibits dose-dependent effects on host immunity.
- Moderate chitin administration can enhance innate immune responses against candidiasis.
- Higher chitin doses may suppress immune function, potentially increasing susceptibility to infection.