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Adaptive immune responses to Acanthamoeba cysts
Kathy McClellan1, Kevin Howard, Elizabeth Mayhew
1Department of Ophthalmology, University of Sydney, GPO BOX 4337, Sydney, NSW 2121, Australia.
Experimental Eye Research
|October 18, 2002
Summary
Acanthamoeba cysts trigger immune responses but persist in the cornea. This study shows the immune system recognizes these parasitic cysts, yet they evade elimination, causing persistent infections.
Area of Science:
- Immunology
- Ophthalmology
- Parasitology
Background:
- Acanthamoeba cysts persist in corneas, evading immune elimination.
- This suggests a lack of recognition or effective response by host immunity.
Purpose of the Study:
- To investigate the immunogenicity and antigenicity of Acanthamoeba cysts.
- To understand why Acanthamoeba cysts persist despite host immune presence.
Main Methods:
- Mice were immunized intraperitoneally with Acanthamoeba castellanii.
- Serum IgG levels were measured using ELISA.
- Cell-mediated immunity was assessed via lymphoproliferative assays and delayed-type hypersensitivity (DTH) responses.
Main Results:
- Acanthamoeba cysts demonstrated both immunogenicity and antigenicity.
- Immune responses included anti-Acanthamoeba serum IgG, T lymphocyte proliferation, and DTH reactions.
- These findings confirm Acanthamoeba cysts are recognized by the host immune system.
Conclusions:
- Acanthamoeba cysts are recognized by adaptive immune responses.
- Despite recognition, these responses are insufficient to eliminate cysts from the cornea.
- Immune evasion mechanisms allow Acanthamoeba cyst persistence in ocular infections.