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Acanthamoeba binds to extracellular matrix proteins in vitro
V R Gordon1, E K Asem, M H Vodkin
1Department of Veternary Pathobiology, Purdue University, West Lafayette, Indiana.
Investigative Ophthalmology & Visual Science
|March 1, 1993
Summary
Acanthamoeba polyphaga binds to collagen, laminin, and fibronectin, key extracellular matrix components. Mannose inhibits this binding, offering insights into Acanthamoeba keratitis pathogenesis.
Area of Science:
- Microbiology
- Cell Biology
- Ophthalmology
Background:
- Acanthamoeba keratitis is a severe eye infection.
- Understanding host-pathogen interactions is crucial for treatment.
- Extracellular matrix (ECM) components play a role in tissue adherence.
Purpose of the Study:
- To investigate the in vitro binding of Acanthamoeba polyphaga to ECM proteins.
- To identify potential host-tissue interactions in Acanthamoeba keratitis pathogenesis.
Main Methods:
- Acanthamoeba polyphaga isolated from keratitis cases was used.
- Radiolabeled amoeba were incubated with ECM proteins (collagen IV, laminin, fibronectin) and casein (control) in 96-well plates.
- Scintillation counting measured amoeba binding to coated plates.
Main Results:
- Acanthamoeba polyphaga demonstrated significant, concentration-dependent binding to collagen IV, laminin, and fibronectin.
- Binding affinity followed the order: collagen ≥ laminin >> fibronectin.
- Mannose (alpha-methyl-mannopyranoside) inhibited amoeba binding, while fucose did not.
Conclusions:
- Acanthamoeba exhibits preferential adherence to specific ECM components.
- Mannose-sensitive binding suggests a role for mannose-binding lectins in Acanthamoeba adherence.
- These findings contribute to understanding Acanthamoeba keratitis pathogenesis and potential therapeutic targets.