Drosophila melanogaster model for Mycobacterium abscessus infection
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Published on: September 9, 2015
Chun-Taek Oh1, Cheol Moon, Myeong Seon Jeong
1Drug Biology, Institut Pasteur Korea, Seongnam-si, Gyeonggi-do, Republic of Korea.
Abstract:
Mycobacterium abscessus is a human pathogen that is responsible for a broad spectrum of tissue infections and disseminated infections in immunodeficient patients. This pathogen is one of the most resistant organisms to chemotherapeutic agents. Therefore, we tested the hypothesis that the fruit fly, Drosophila melanogaster, is a genetically tractable model host for M. abscessus. In this context, we infected D. melanogaster with M. abscessus. This M. abscessus infection results in dissemination in the fly body, followed by death, which is accompanied by severe indirect flight muscle and brain damage. Our data show that M. abscessus can grow and replicate in D. melanogaster w(1118) and that it elicited a humoral immune response, especially of the Toll antimicrobial peptide pathway. To the best of our knowledge, this is the first report that mycobacteria induce the production of antimicrobial peptides in D. melanogaster.
Insights
The fruit fly, Drosophila melanogaster, serves as a viable model for studying Mycobacterium abscessus infections. This research demonstrates M. abscessus replication and host immune response in flies, offering new avenues for antimicrobial peptide research.
Area of Science:
- Microbiology
- Infectious Diseases
- Genetics
Background:
- Mycobacterium abscessus is a resilient human pathogen causing diverse infections, particularly in immunocompromised individuals.
- Its resistance to antibiotics poses significant challenges for treatment.
- Developing effective model systems is crucial for understanding M. abscessus pathogenesis and identifying new therapeutic targets.
Purpose of the Study:
- To investigate the utility of Drosophila melanogaster as a genetically tractable model host for Mycobacterium abscessus.
- To characterize the host-pathogen interactions and immune responses in M. abscessus-infected fruit flies.
Main Methods:
- Infection of Drosophila melanogaster (w1118 strain) with Mycobacterium abscessus.
- Observation of pathogen dissemination, host survival, and tissue damage (indirect flight muscle, brain).
- Analysis of the host's humoral immune response, focusing on antimicrobial peptide pathways.
Main Results:
- Mycobacterium abscessus successfully disseminated and replicated within the fruit fly.
- Infection led to host death and significant damage to indirect flight muscles and the brain.
- A humoral immune response was elicited, notably involving the Toll antimicrobial peptide pathway.
- This study is the first to report mycobacteria inducing antimicrobial peptide production in Drosophila.
Conclusions:
- Drosophila melanogaster is a suitable and genetically tractable model for studying Mycobacterium abscessus infections.
- The fruit fly model recapitulates key aspects of M. abscessus pathogenesis, including dissemination, tissue damage, and immune activation.
- This model provides a platform for exploring mycobacterial infections and the role of antimicrobial peptides in host defense.
