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Characterisation of Candida albicans infection of an in vitro oral epithelial model using confocal laser scanning microscopy

Malic, Sladjana, Hill, Katja E., Ralphs, James Robert, Hayes, Anthony Joseph, Thomas, David William, Potts, Albert John Cornel and Williams, David Wynne 2007. Characterisation of Candida albicans infection of an in vitro oral epithelial model using confocal laser scanning microscopy. Oral Microbiology And Immunolology 22 (3) , pp. 188-194. 10.1111/j.1399-302X.2007.00344.x

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Abstract

INTRODUCTION: Oral candidosis presents as several distinct forms and one of these, chronic hyperplastic candidosis, is distinguished by penetration of the epithelium by Candida. The aim of this study was to use confocal laser scanning microscopy to examine invasion of the oral epithelium by Candida albicans from different oral conditions and to determine whether inherent strain differences exist that could relate to infection type. Reverse transcription-polymerase chain reaction was also used to detect products from virulence gene families. METHODS: C. albicans (n = 19) was used to infect reconstituted human oral epithelium, which was incubated for 12 h. One half of the reconstituted human oral epithelium was then fixed and stained with concanavalin A-Alexa 594, pan-cytokeratin antibody-Alexa 488 and Hoechst nucleic acid dye. RNA was extracted from the remaining tissue for reverse transcription-polymerase chain reaction targeting secreted aspartyl proteinase, phospholipase and agglutinin-like sequence genes of C. albicans. RESULTS: Confocal laser scanning microscopy revealed strain-dependent tissue invasion, with differences evident in surface colonization, C. albicans morphology and the extent and pattern of tissue penetration. Hyphae were seen to directly penetrate epithelial cells and migrate between keratinocytes with yeast budding also evident in the reconstituted human oral epithelium. A relationship between 'high tissue invasion' and expression of secreted aspartyl proteinase genes 4-6 was noted. Interestingly, four of the five 'high invaders' originated from chronic hyperplastic candidosis. CONCLUSIONS: Confocal laser scanning microscopy permitted high resolution analysis of reconstituted human oral epithelium invasion by C. albicans and identified strain differences in the invasion process. Association between extensive hyphal morphology, direct epithelial penetration and high surface colonization were made with the 'highly invasive' strains.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Biosciences
Dentistry
Systems Immunity Research Institute (SIURI)
Subjects: R Medicine > RK Dentistry
Uncontrolled Keywords: Candida albicans ; confocal laser scanning microscopy ; oral epithelial model ; virulence factors
Publisher: Blackwell Publishing
ISSN: 1399-302X
Last Modified: 15 Dec 2017 08:34
URI: http://orca.cf.ac.uk/id/eprint/707

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