Caries Research

Original Paper

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Manganese Affects Streptococcus mutans Virulence Gene Expression

Arirachakaran P.a · Benjavongkulchai E.a · Luengpailin S.b · Ajdić D.c · Banas J.A.d

Author affiliations

aChulalongkorn University, Bangkok, and bKhon Kaen University, Khon Kaen, Thailand; cUniversity of Oklahoma Health Sciences Center, Oklahoma City, Okla., and dUniversity of Iowa College of Dentistry, Iowa City, Iowa, USA

Corresponding Author

Jeffrey A. Banas

University of Iowa College of Dentistry

Dows Institute for Research, Dental Science N 436

Iowa City, IA 52242 (USA)

Tel. +1 319 335 9911, Fax +1 319 335 8895, E-Mail Jeffrey-banas@uiowa.edu

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Caries Res 2007;41:503–511

Abstract

Background/Aims: Studies of trace metals in drinking water and tooth enamel have suggested a caries-promoting potential for manganese (Mn). Additionally, Mn has been shown to be essential for the expression of mutans streptococci virulence factors such as the glucan-binding lectin (GBL) of Streptococcus sobrinus. The Streptococcus mutans glucan-binding protein (Gbp) GbpC is the functional analogue of the S. sobrinus GBL. S. mutans Gbps have been shown to contribute to biofilm architecture and virulence. This study was undertaken to examine the effects of Mn on the transcription of genes encoding S. mutans Gbps, including gbpC, along with other critical S. mutans virulence genes. Methods: Microarray analyses suggested the potential for an Mn effect on Gbp genes. Further investigation of the Mn effects on selected genes was undertaken by performing Northern blots, Western blots, and RT-PCR under conditions of planktonic and biofilm growth in Mn-depleted media or in media containing 50 µM Mn. Results: Mn resulted in increased expression of gbpC and gtfB, and decreased expression of wapA, in both planktonic and biofilm cultures. The expression levels of gbpA and gbpD were also decreased in the presence of Mn, but only in biofilms. The expression of gtfC was increased in the presence of Mn only in planktonic cultures. The spaP gene was expressed more highly in Mn-supplemented planktonic cultures but less in Mn-supplemented biofilms. Conclusion: Mn availability affects the expression of multiple S. mutans genes involved in adhesion and biofilm formation. Furthermore, these effects depend on the growth state of the organism.

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Article / Publication Details

First-Page Preview
Abstract of Original Paper

Received: January 12, 2007
Accepted: August 14, 2007
Published online: November 08, 2007
Issue release date: November 2007

Number of Print Pages: 9
Number of Figures: 5
Number of Tables: 1

ISSN: 0008-6568 (Print)
eISSN: 1421-976X (Online)

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