期刊
MICRON
卷 41, 期 6, 页码 604-608出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.micron.2010.03.011
关键词
Candida parapsilosis; SEM; Smooth phenotype; Crepe phenotype; Adhesion
类别
资金
- Fundacao-Araucaria-Parana-Brazil
- PROPPG/UEL-Brazil
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES)-Brazil
Candida parapsilosis is found frequently as commensal organism on epithelial tissues, and is also an increasing cause of nosocomial infection. Scanning electron microscope (SEM) observations were used to analyse the capability of C parapsilosis cells to adhere and grow as biofilm on human natural substrates and to compare the adherence pattern of isolates exhibiting distinct phenotypes. Cells from the crepe phenotype are predominantly elongated and form pseudohyphae whereas cells from the smooth phenotype are yeast-shaped, either in liquid cultures or on human nail and hair surfaces. The electron micrographs revealed that C. parapsilosis cells from the smooth phenotype adhered in higher number to both surfaces compared to the observed for the crepe phenotype. SEM analysis of human hair surface revealed that cells from the smooth phenotype appear as clumped blastoconidia of uniform morphology embedded in a flocculent extracellular material forming biofilm. The extracellular material and biofilm were seeing in a less extension in the crepe phenotype. A distinct adherence pattern was observed when human nail was used as substrate. Here C. parapsilosis cells seem to be linked to surface structures of human nail plate. Fibrillar extracellular material was observed connecting neighbouring cells as well as nail surface. (C) 2010 Elsevier Ltd. All rights reserved.
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