Piedraia hortae: biofilm formation and its importance in the pathogenesis of Piedra nigra (black piedra).
| Autor: | Junior HLA; Postgraduation in Health and Behavior, Universidade Católica de Pelotas; Department of Dermatology, Universidade Federal de Pelotas, Pelotas, RS, Brazil. Electronic address: hiramalmeidajr@hotmail.com., Assis TM; Postgraduation in Health and Behavior, Universidade Católica de Pelotas., Faria EC; Postgraduation in Health and Behavior, Universidade Católica de Pelotas., Costa LRK; Sector of Mycology, Laboratório Ary Costa, Pelotas, RS, Brazil., Ibaldo BM; Sector of Mycology, Laboratório Ary Costa, Pelotas, RS, Brazil. |
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| Jazyk: | angličtina |
| Zdroj: | Anais brasileiros de dermatologia [An Bras Dermatol] 2024 Jul 19. Date of Electronic Publication: 2024 Jul 19. |
| DOI: | 10.1016/j.abd.2023.12.005 |
| Abstrakt: | Background: Little is known about the ultrastructure of Piedraia hortae. Objective: To examine a P. hortae colony with scanning electron microscopy and investigate possible contributions to its pathogenesis. Results: On low magnifications, two distinct aspects of the colony are identified, a compact area and a filamentous area. Analysis of the filamentous area demonstrates hyphae adhered by a thin reticular substance. A recurring finding is the adhesion between the fungal filaments in parallel. On high magnifications, the micro fibrillar substance adhering the hyphae to each other becomes very evident. Examination of the compact area shows the hyphae embedded in the reticular matrix forming a biofilm and the colony well adhered. On high magnification, it can be observed that the hyphae are within this fibrillar matrix, which has the same appearance as the filamentous substance that adheres the hyphae to each other. Study Limitations: Only one strain was examined. Conclusions: The formation of biofilm with fungal structures and reticulated extracellular substance is important in the pathogenesis of Piedra nigra. (Copyright © 2024 Sociedade Brasileira de Dermatologia. Published by Elsevier España, S.L.U. All rights reserved.) |
| Databáze: | MEDLINE |
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