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Updated: Apr 25, 2026
Analysis of the Epithelial Damage Produced by Entamoeba histolytica Infection
Published on: June 12, 2014
Proteomic profiling of the infective trophozoite stage of Acanthamoeba polyphaga
Karin Silva Caumo1, Karina Mariante Monteiro2, Thiely Rodrigues Ott2
1Laboratório de Parasitologia, Instituto de Ciências Básicas da Saúde, Departamento de Microbiologia, Imunologia e Parasitologia, Universidade Federal do Rio Grande do Sul, CEP: 90050170 Porto Alegre, RS, Brazil.
Abstract:
Acanthamoeba polyphaga is a free-living protozoan pathogen, whose infective trophozoite form is capable of causing a blinding keratitis and fatal granulomatous encephalitis in humans. The damage caused by A. polyphaga trophozoites in human corneal or brain infections is the result of several different pathogenic mechanisms that have not yet been elucidated at the molecular level. We performed a comprehensive analysis of the proteins expressed by A. polyphaga trophozoites, based on complementary 2-DE MS/MS and gel-free LC-MS/MS approaches. Overall, 202 non-redundant proteins were identified. An A. polyphaga proteomic map in the pH range 3-10 was produced, with protein identification for 184 of 370 resolved spots, corresponding to 142 proteins. Additionally, 94 proteins were identified by gel-free LC-MS/MS. Functional classification revealed several proteins with potential importance for pathogen survival and infection of mammalian hosts, including surface proteins and proteins related to defense mechanisms. Our study provided the first comprehensive proteomic survey of the trophozoite infective stage of an Acanthamoeba species, and established foundations for prospective, comparative and functional studies of proteins involved in mechanisms of survival, development, and pathogenicity in A. polyphaga and other pathogenic amoebae.
Insights
This study identified 202 proteins in Acanthamoeba polyphaga, revealing key molecules involved in its ability to cause severe human infections like keratitis and encephalitis. This provides a foundation for understanding amoebic pathogenicity.
Area of Science:
- Proteomics
- Microbiology
- Pathogen Biology
Background:
- Acanthamoeba polyphaga is a protozoan pathogen causing human keratitis and encephalitis.
- The molecular mechanisms of A. polyphaga pathogenicity remain poorly understood.
Purpose of the Study:
- To conduct a comprehensive proteomic analysis of the A. polyphaga trophozoite infective stage.
- To identify proteins crucial for pathogen survival and host infection.
Main Methods:
- Utilized complementary 2-DE MS/MS and gel-free LC-MS/MS approaches for protein identification.
- Generated a proteomic map of A. polyphaga in the pH range 3-10.
- Identified 202 non-redundant proteins in total.
Main Results:
- Identified 142 proteins from resolved spots on the 2-DE map and 94 additional proteins via LC-MS/MS.
- Functional classification revealed proteins important for survival and defense mechanisms.
- Highlighted surface proteins with potential roles in host interaction.
Conclusions:
- This is the first comprehensive proteomic survey of the A. polyphaga trophozoite stage.
- The findings lay the groundwork for future studies on Acanthamoeba survival, development, and pathogenicity.
- Provides insights into proteins involved in infections caused by pathogenic amoebae.
