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Clinical Oral Investigations

, Volume 23, Issue 3, pp 1225–1235 | Cite as

Correlation between relative bacterial activity and lactate dehydrogenase gene expression of co-cultures in vitro

  • Carolin WaltherEmail author
  • Hendrik Meyer-Lueckel
  • Georg Conrads
  • Marcella Esteves-Oliveira
  • Karsten Henne
Original Article

Abstract

Objectives

The present study aims at correlating the relative bacterial activity with the H+ concentration and the ldh expression of caries-associated bacteria in co-cultures.

Materials and methods

Well plates were prepared with BHI medium and cultures of Lactobacillus paracasei and Fusobacterium nucleatum. Bacterial growth at 37 °C was measured using a microplate-photometer before and after adding sucrose to the samples. Samples of co-cultures (n = 12) and single-species cultures (n = 3) were taken and pH was assessed. Real-time quantitative PCRs were applied targeting the 16S-gene, the 16S-rRNA, the ldh-gene, and the ldh-mRNA.

Results

For L. paracasei with sucrose, an increase in relative bacterial activity (62.8% ± 23.5% [mean, SE]) was observed, while F. nucleatum showed a clear decrease in relative bacterial activity (− 35.0% ± 9.6%). Simultaneously, the H+ concentration increased (1.15E-05 mol*l-1 ± 4.61E-07 mol*l-1). Consequently, a significant positive correlation was found between L. paracasei’s relative bacterial activity and H+ concentration (Spearman rank correlation, r = 0.638; p = 0.002), while F. nucleatum exhibited a negative correlation (r = − 0.741; p ≤ 0.001). Furthermore L. paracasei with sucrose showed a moderate, but significant positive correlation between relative bacterial activity and ldh-expression (r = 0.307; p = 0.024).

Conclusions and clinical relevance

The relative bacterial activity after sucrose pulse showed a significant correlation not only to the acid production (H+ concentration) but also to ldh expression of L. paracasei. However, further research is required to confirm these findings in a mature biofilm in vivo.

Keywords

Dental caries/etiology Relative bacterial activity 16S rRNA Lactobacilli Fusobacteria Biofilm ldh-expression 

Notes

Acknowledgements

The technical assistance of Beate Melzer-Krick and Laura Katharina Wendt is greatly acknowledged.

Funding

The funding of this research work was done with the internal resources of the Department of Operative Dentistry, Periodontology and Preventive Dentistry of RWTH Aachen University and the Division of Oral Microbiology and Immunology, Department of Operative Dentistry, Periodontology, and Preventive Dentistry of RWTH Aachen University.

Compliance with ethical standards

Conflict of interest

The authors declare they have no conflict of interest.

Ethical approval

This article does not contain any studies with human participants or animals performed by any authors.

Informed consent

For this type of study, formal consent is not required.

Supplementary material

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Carolin Walther
    • 1
    Email author
  • Hendrik Meyer-Lueckel
    • 2
  • Georg Conrads
    • 3
  • Marcella Esteves-Oliveira
    • 1
  • Karsten Henne
    • 3
  1. 1.Department of Operative Dentistry, Periodontology, and Preventive DentistryUniversity Hospital RWTH AachenAachenGermany
  2. 2.Department of Preventive, Restorative and Pediatric DentistryUniversity of BernBernSwitzerland
  3. 3.Division of Oral Microbiology and Immunology, Department of Operative Dentistry, Periodontology, and Preventive DentistryRWTH Aachen UniversityAachenGermany

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