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Galleria mellonella Larvae as an Infection Model for Penicillium marneffei
Xiaowen Huang1, Dedong Li, Liyan Xi
1Department of Dermatology, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, 107 West Yanjiang Road, Guangzhou, China.
Abstract:
Penicillium marneffei, the only known dimorphic and pathogenic species in the genus of Penicillium, is responsible for severe to deadly infection in immunocompromised patients. In this study, P. marneffei was able to infect the greater wax moth Galleria mellonella. The increasing inoculum doses of P. marneffei cells resulted in greater larval mortality, and the larval mortality rate also depended on the incubation temperature after P. marneffei infection and different P. marneffei strains. Moreover, the phagocytosis of hemocytes to P. marneffei was investigated, and it showed that the phagocytosis was increasing during the infection. These results demonstrated that G. mellonella can be effectively used to facilitate the in vivo study of P. marneffei infection and hemocytes are the key component of the larvae's immune defenses.
Insights
The greater wax moth Galleria mellonella serves as a model for studying Penicillium marneffei infections. Larval mortality increases with fungal dose, temperature, and strain, with hemocytes crucial for defense.
Area of Science:
- Mycology
- Infectious Diseases
- Immunology
- Invertebrate Pathology
Background:
- Penicillium marneffei is the sole dimorphic and pathogenic species within the Penicillium genus.
- This fungus causes severe, potentially fatal infections, particularly in immunocompromised individuals.
Purpose of the Study:
- To investigate the efficacy of the greater wax moth (Galleria mellonella) as a model organism for studying Penicillium marneffei infections.
- To determine the impact of inoculum dose, incubation temperature, and fungal strain on P. marneffei pathogenicity in G. mellonella.
- To explore the role of hemocytes in the immune response of G. mellonella against P. marneffei.
Main Methods:
- Infection of Galleria mellonella larvae with varying doses of Penicillium marneffei.
- Incubation of infected larvae at different temperatures and assessment of mortality rates.
- Comparison of pathogenicity across different Penicillium marneffei strains.
- Microscopic investigation of hemocyte phagocytosis of P. marneffei during infection.
Main Results:
- Galleria mellonella larvae were susceptible to Penicillium marneffei infection.
- Larval mortality rates correlated positively with increasing inoculum doses of P. marneffei.
- Mortality was influenced by incubation temperature and the specific P. marneffei strain used.
- Hemocyte phagocytosis of P. marneffei increased throughout the infection period.
Conclusions:
- Galleria mellonella is a suitable and effective model for in vivo studies of Penicillium marneffei pathogenesis.
- Hemocytes represent a critical component of the innate immune defense in G. mellonella against P. marneffei.
- Understanding these interactions can inform strategies for managing P. marneffei infections.
