Acanthamoeba spp. as Factors for Severe Infectious Diseases in Humans, 2nd Edition

A special issue of Microorganisms (ISSN 2076-2607). This special issue belongs to the section "Medical Microbiology".

Deadline for manuscript submissions: 31 July 2024 | Viewed by 1426

Special Issue Editors


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Guest Editor
Department of Medical Biology, Medical University of Warsaw, Litewska 14/16, 00-575 Warsaw, Poland
Interests: infections, pathogenesis, pathogens, clinical and laboratory diagnosis, in vitro investigation, molecular biology examination, PCR, TEM, SEM, medical microbiology, medical .parasitology, nosocomial Infections
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Guest Editor
Head of the Department of Ophthalmology, Medical University of Warsaw, Warsaw, Poland
Interests: diagnosis; diagnosis and treatment; cataract surgery; glaucoma surgery and glaucoma/cataract surgery; lens implants; corneal diseases
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

This Special Issue is a continuation of our previous Special Issue, “Acanthamoeba spp. as Factors for Severe Infectious Diseases in Humans”.

Different strains of Acanthamoeba spp., widely distributed in natural and man-made environments, are able to enter the human body from different sources, causing pathogenic effects. They are etiological agents of a rare, usually fatal granulomatous amoebic encephalitis developing in immunocompromised individuals. Pathogenic Acanthamoeba strains cause the vision-threatening, difficult-to-diagnose corneal disease Acanthamoeba keratitis (AK). The progressive, devastating, considered-rare disease can result in a loss of visual acuity and even blindness; successful treatment has not yet been fully established. In recent decades, incidents of AK have been detected with increasing frequency, especially in contact lens wearers. Threats to individual and public health caused by AK remain poorly investigated. They are a worldwide medical problem; however, the knowledge and awareness of them are still insufficient. There are challenges in AK management: suitable clinical and laboratory diagnosis, in vivo/in vitro and molecular techniques, epidemiology aspects, chemotherapy, pathogenesis mechanisms, the potential role of concomitant infections and endosymbiotic microorganisms as secondary disease factors, an association with oral cavity microbiota, the influence of various risk factors. In this Special Issue, we will present up-to-date data and advanced research on the prevention of health threats caused by Acanthamoeba spp. infections.

Prof. Dr. Lidia Chomicz
Prof. Dr. Jacek P. Szaflik
Guest Editors

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Keywords

  • Acanthamoeba
  • facultative parasites
  • epidemiological aspects
  • contact lens
  • diagnosis and treatment
  • Acanthamoeba keratitis
  • concomitant infections bacteria and fungi
  • endosymbiotic microorganisms
  • trophozoites and cysts
  • oral cavity microbiota
  • slit lamp
  • confocal microscopy
  • corneal isolates and cultivation methods
  • in vivo and in vitro and molecular techniques.

Published Papers (1 paper)

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Research

16 pages, 3550 KiB  
Article
Extracellular Vesicles Secreted by Acanthamoeba culbertsoni Have COX and Proteolytic Activity and Induce Hemolysis
by Francisco Sierra-López, Ismael Castelan-Ramírez, Dolores Hernández-Martínez, Lizbeth Salazar-Villatoro, David Segura-Cobos, Catalina Flores-Maldonado, Verónica Ivonne Hernández-Ramírez, Tomás Ernesto Villamar-Duque, Adolfo René Méndez-Cruz, Patricia Talamás-Rohana and Maritza Omaña-Molina
Microorganisms 2023, 11(11), 2762; https://doi.org/10.3390/microorganisms11112762 - 14 Nov 2023
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Abstract
Several species of Acanthamoeba genus are potential pathogens and etiological agents of several diseases. The pathogenic mechanisms carried out by these amoebae in different target tissues have been documented, evidencing the relevant role of contact-dependent mechanisms. With the purpose of describing the pathogenic [...] Read more.
Several species of Acanthamoeba genus are potential pathogens and etiological agents of several diseases. The pathogenic mechanisms carried out by these amoebae in different target tissues have been documented, evidencing the relevant role of contact-dependent mechanisms. With the purpose of describing the pathogenic processes carried out by these protozoans more precisely, we considered it important to determine the emission of extracellular vesicles (EVs) as part of the contact-independent pathogenicity mechanisms of A. culbertsoni, a highly pathogenic strain. Through transmission electronic microscopy (TEM) and nanoparticle tracking analysis (NTA), EVs were characterized. EVs showed lipid membrane and a size between 60 and 855 nm. The secretion of large vesicles was corroborated by confocal and TEM microscopy. The SDS-PAGE of EVs showed proteins of 45 to 200 kDa. Antigenic recognition was determined by Western Blot, and the internalization of EVs by trophozoites was observed through Dil-labeled EVs. In addition, some EVs biological characteristics were determined, such as proteolytic, hemolytic and COX activity. Furthermore, we highlighted the presence of leishmanolysin in trophozites and EVs. These results suggest that EVs are part of a contact-independent mechanism, which, together with contact-dependent ones, allow for a better understanding of the pathogenicity carried out by Acanthamoeba culbertsoni. Full article
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