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Published in: BMC Oral Health 1/2012

Open Access 01-12-2012 | Research article

Effects of salivary protein flow and indigenous microorganisms on initial colonization of Candida albicans in an in vivo model

Authors: Norihiko Kanaguchi, Naoki Narisawa, Tatsuro Ito, Yosuke Kinoshita, Yasuka Kusumoto, Osamu Shinozuka, Hidenobu Senpuku

Published in: BMC Oral Health | Issue 1/2012

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Abstract

Background

Candida albican s is a dimorphic fungus that is part of the commensal microbial flora of the oral cavity. When the host immune defenses are impaired or when the normal microbial flora is disturbed, C. albicans triggers recurrent infections of the oral mucosa and tongue. Recently, we produced NOD/SCID.e2f1 -/- mice that show hyposalivation, decrease of salivary protein flow, lack IgA and IgG in saliva, and have decreased NK cells. Our objective was to characterize C. albicans infection and biofilm formation in mice.

Methods

NOD/SCID.e2f1 -/- mice were used as an animal model for C. albicans infection. C. albicans yeast and hyphal forms solutions were introduced in the oral cavity after disinfection by Chlorhexidine.

Results

The numbers of C. albicans colonized and decreased in a time-dependent manner in NOD/SCID.e2f1 +/+ after inoculation. However, the colonization levels were higher in NOD/SCID.e2f1 +/+ than NOD/SCID.e2f1 -/- mice. In the mice fed 1% sucrose water before inoculation, C. albicans sample was highly contaminated by indigenous microorganisms in the oral cavity; and was not in the mice fed no sucrose water. The colonization of C. albicans was not influenced by the contamination of indigenous microorganisms. The hyphal form of C. albicans restricted the restoration of indigenous microorganisms. The decreased saliva in NOD/SCID.e2f1 -/- did not increase the colonization of C. albicans in comparison to NOD/SCID.e2f1 +/+ mice. We suggest that the receptor in saliva to C. albicans may not be sufficiently provided in the oral cavity of NOD/SCID.e2f1 -/- mice.

Conclusion

The saliva protein flow may be very important for C. albicans initial colonization, where the indigenous microorganisms do not affect colonization in the oral cavity.
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Metadata
Title
Effects of salivary protein flow and indigenous microorganisms on initial colonization of Candida albicans in an in vivo model
Authors
Norihiko Kanaguchi
Naoki Narisawa
Tatsuro Ito
Yosuke Kinoshita
Yasuka Kusumoto
Osamu Shinozuka
Hidenobu Senpuku
Publication date
01-12-2012
Publisher
BioMed Central
Published in
BMC Oral Health / Issue 1/2012
Electronic ISSN: 1472-6831
DOI
https://doi.org/10.1186/1472-6831-12-36

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