Name: an analytical tool-box for comprehensive biochemical, structural and transcriptome evaluation of oral biofilms mediated by mutans streptococci
Uploaded: 2011-01-25T17:00:00
Description: Watch this Scientific Journal Video about An Analytical Tool-box for Comprehensive Biochemical, Structural and Transcriptome Evaluation of Oral Biofilms Mediated by Mutans Streptococci at JoVE.com

The authors would like to thank Dr. Gary Xie and Herbert Lee for the development of MDV. We also thank Drs. Simone Duarte, Ramiro Murata, Jae-Gyu Jeon, Jacqueline Abranches, and Ms. Stacy Gregoire for their technical and scientific contribution for the analytical components of the tool-box. This study was supported in part by USPHS Research grant DE018023 from the National Institute of Dental and Craniofacial Research.

1. STEP 1 - BIOASSAYS
The biofilm method uses discs of hydroxyapatite (HA) as tooth surrogate (Clarkson Chromatography Products, Inc., South Williamsport, PA, USA; surface area = 2.7&plusmn;0.2 cm2) coated with saliva (mimicking the presence of acquired pellicle), placed in a vertical position 4, 5, 8.
<ol>
 <li>Biochemical Assays.
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 <li>The biofilms are either (i) homogenized by sonication 9 or (ii) kept ...

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C. u. r. y. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+role+of+sucrose+in+cariogenic+dental+biofilm+formation--new+insight.">The role of sucrose in cariogenic dental biofilm formation--new insight.</a> J Dent Res. 85, 878-887 (2006).</li><li>Koo, H., Schobel, B. D., Scott-Annem, K., Watson, G., Bowen, W. H., Cury, J. A., Rosalen, P. L., Park, Y. K. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Apigenin+and+tt-farnesol+with+fluoride+effects+on+S.+mutans+biofilms+and+dental+caries.">Apigenin and tt-farnesol with fluoride effects on S. mutans biofilms and dental caries.</a> J Dent Res. 84, 1016-1020 (2005).</li><li>Koo, H., Xiao, J., Klein, M. I., Jeon, J. 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L., Koo, H. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Influences+of+naturally+occurring+agents+in+combination+with+fluoride+on+gene+expression+and+structural+organization+of+Streptococcus+mutans+in+biofilms.">Influences of naturally occurring agents in combination with fluoride on gene expression and structural organization of Streptococcus mutans in biofilms.</a> BMC Microbiol. 9, 228-228 (2009).</li><li>Klein, M. I., DeBaz, L., Agidi, S., Lee, H., Xie, G., Lin, A. H. M., Hamaker, B. R., Lemos, J. A., Koo, H. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Dynamics+of+Streptococcus+mutans+transcriptome+in+response+to+starch+and+sucrose+during+biofilm+development.">Dynamics of Streptococcus mutans transcriptome in response to starch and sucrose during biofilm development.</a> PLoS ONE. , 0013478-0013478 (2010).</li><li>Lemos, J. A., Abranches, J., Koo, H., Marquis, R. E., Burne, R. A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Protocols+to+Study+the+Physiology+of+Oral+Biofilms.">Protocols to Study the Physiology of Oral Biofilms.</a> Methods Mol Biol. 666, 87-102 (2010).</li><li>Koo, H., Hayacibara, M. F., Schobel, B. D., Cury, J. A., Rosalen, P. L., Park, Y. K., Vacca-Smith, A. M., Bowen, W. H. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Inhibition+of+Streptococcus+mutans+biofilm+accumulation+and+polysaccharide+production+by+apigenin+and+tt-farnesol.">Inhibition of Streptococcus mutans biofilm accumulation and polysaccharide production by apigenin and tt-farnesol.</a> J Antimicrob Chemother. 52, 782-789 (2003).</li><li>Koo, H., Seils, J., Abranches, J., Burne, R. A., Bowen, W. H., Quivey, R. G. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Influence+of+apigenin+on+gtf+gene+expression+in+Streptococcus+mutans+UA159.">Influence of apigenin on gtf gene expression in Streptococcus mutans UA159.</a> Antimicrob. Agents Chemother. 50, 542-546 (2006).</li><li>Klein, M. I., Duarte, S., Xiao, J., Mitra, S., Foster, T. H., Koo, H. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Structural+and+molecular+basis+of+the+role+of+starch+and+sucrose+in+Streptococcus+mutans+biofilm+development.">Structural and molecular basis of the role of starch and sucrose in Streptococcus mutans biofilm development.</a> Appl Environ Microbiol. 75, 837-841 (2009).</li><li>Cury, J. 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In this presentation, we demonstrated two critical components of the Analytical Tool-Box (EPS/bacteria imaging and microarray data mining/processing), the versatility and usefulness of the various assays integrated in the system. Clearly, the tool-box facilitated the comprehensive (comparative) and simultaneous analysis of the various aspects of the biofilms biochemistry, architecture and gene expression in response to the different experimental conditions using an in vitro model.7 Considering the dy...

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		<th>Material Name</th>
		<th>Type</th>
		<th>Company</th>
		<th>Catalogue Number</th>
		<th>Comment</th>
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<td>Syto 9</td>
<td>&nbsp;</td>
<td>Invitrogen </td>
<td>S34854</td>
<td>&nbsp;</td>
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<td>Syto 60</td>
<td>&nbsp;</td>
<td>Invitrogen </td>
<td>S11342</td>
<td>&nbsp;</td>
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<td>Dextran conjugated alexa 647</td>
<td>&nbsp;</td>
<td>Invitrogen </td>
<td>D22914</td>
<td>&nbsp;</td>
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<td>Olympus FV1000 two-photon laser scanning microscope</td>
<td>&nbsp;</td>
<td>Olympus, Tokyo, Japan</td>
<td>&nbsp;</td>
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an analytical tool-box for comprehensive biochemical, structural and transcriptome evaluation of oral biofilms mediated by mutans streptococci

Biofilms are highly dynamic, organized and structured communities of microbial cells enmeshed in an extracellular matrix of variable density and composition 1, 2. In general, biofilms develop from initial microbial attachment on a surface followed by formation of cell clusters (or microcolonies) and further development and stabilization of the microcolonies, which occur in a complex extracellular matrix. The majority of biofilm matrices harbor exopolysaccharides (EPS), and dental biofilms are no exception; especially those associated with caries disease, which are mostly mediated by mutans streptococci 3. The EPS are synthesized by microorganisms (S. mutans, a key contributor) by means of extracellular enzymes, such as glucosyltransferases using sucrose primarily as substrate 3.
Studies of biofilms formed on tooth surfaces are particularly challenging owing to their constant exposure to environmental challenges associated with complex diet-host-microbial interactions occurring in the oral cavity. Better understanding of the dynamic changes of the structural organization and composition of the matrix, physiology and transcriptome/proteome profile of biofilm-cells in response to these complex interactions would further advance the current knowledge of how oral biofilms modulate pathogenicity. Therefore, we have developed an analytical tool-box to facilitate biofilm analysis at structural, biochemical and molecular levels by combining commonly available and novel techniques with custom-made software for data analysis. Standard analytical (colorimetric assays, RT-qPCR and microarrays) and novel fluorescence techniques (for simultaneous labeling of bacteria and EPS) were integrated with specific software for data analysis to address the complex nature of oral biofilm research.
The tool-box is comprised of 4 distinct but interconnected steps (Figure 1): 1) Bioassays, 2) Raw Data Input, 3) Data Processing, and 4) Data Analysis. We used our in vitro biofilm model and specific experimental conditions to demonstrate the usefulness and flexibility of the tool-box. The biofilm model is simple, reproducible and multiple replicates of a single experiment can be done simultaneously 4, 5. Moreover, it allows temporal evaluation, inclusion of various microbial species 5 and assessment of the effects of distinct experimental conditions (e.g. treatments 6; comparison of knockout mutants vs. parental strain 5; carbohydrates availability 7). Here, we describe two specific components of the tool-box, including (i) new software for microarray data mining/organization (MDV) and fluorescence imaging analysis (DUOSTAT), and (ii) in situ EPS-labeling. We also provide an experimental case showing how the tool-box can assist with biofilms analysis, data organization, integration and interpretation.

Watch this Scientific Journal Video about An Analytical Tool-box for Comprehensive Biochemical, Structural and Transcriptome Evaluation of Oral Biofilms Mediated by Mutans Streptococci at JoVE.com

An Analytical Tool-box for Comprehensive Biochemical, Structural and Transcriptome Evaluation of Oral Biofilms Mediated by Mutans Streptococci

Biofilms formed on tooth surfaces are highly complex and exposed to constant innate and exogenous environmental challenges, which modulate their architecture, physiology and transcriptome. We developed a toolbox to examine the composition, structural organization and gene expression of oral biofilms, which can be adapted to other areas of biofilm research.

Biofilms are highly dynamic, organized and structured communities of microbial cells enmeshed in an extracellular matrix of variable density and ...

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