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Pathogenicity, morphology, and differentiation of Acanthamoeba
11135 Ross, Division of Infectious Diseases, Johns Hopkins University School of Medicine, 720 Rutland Avenue, Baltimore, MD 21205, USA. nkhan@jhmi.edu
Current Microbiology
|October 31, 2001
Summary
Pathogenic Acanthamoeba, causing serious eye infections, show more acanthopodia and adhere to corneal cells. These microbes use phagocytosis, a key factor in Acanthamoeba keratitis development.
Area of Science:
- Microbiology
- Ophthalmology
- Cell Biology
Background:
- Acanthamoeba keratitis is a severe corneal infection linked to Acanthamoeba species.
- Prior research highlighted genotypic distinctions between pathogenic and non-pathogenic Acanthamoeba strains.
Purpose of the Study:
- To investigate morphological differences between pathogenic and non-pathogenic Acanthamoeba strains.
- To analyze the interaction of Acanthamoeba with corneal epithelial cells.
Main Methods:
- Scanning electron microscopy was employed to visualize Acanthamoeba morphology.
- Co-culture experiments were performed to observe amoeba-epithelial cell interactions.
Main Results:
- Pathogenic Acanthamoeba displayed a greater number of acanthopodia compared to non-pathogenic strains.
- Adhesion to corneal epithelial cells was observed exclusively with pathogenic Acanthamoeba.
- Phagocytosis, via amoebastome formation, was evident in pathogenic Acanthamoeba.
Conclusions:
- Morphological differences, specifically acanthopodia count and adhesion capability, distinguish pathogenic Acanthamoeba.
- Acanthamoeba phagocytosis is crucial for nutrient acquisition and a significant contributor to keratitis pathogenesis.