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Dual-species biofilms of Streptococcus mutans and Candida albicans exhibit more biomass and are mutually beneficial compared with single-species biofilms.


ABSTRACT: Background: Streptococcus mutans (Sm) and Candida albicans (Ca) are found in biofilms of early childhood caries. Objective: To characterize in vitro dual- and single-species biofilms of Sm and Ca formed on saliva-coated hydroxyapatite discs in the presence of sucrose. Design: Evaluation of biofilms included biochemical [biomass, proteins, matrix's water-soluble (WSP) and alkali-soluble (ASP) polysaccharides, microbiological, 3D structure, gene expression, and stress tolerance analyses. Results: Biomass and proteins were higher for dual-species and lower for Ca (p = 0.001). Comparison of Sm single- and dual-species biofilms revealed no significant difference in Sm numbers or quantity of WSP (p > 0.05). Dual-species biofilms contained a higher population of Ca (p < 0.001). The quantity of ASP was higher in dual-species biofilms (vs Ca single-species biofilms; p = 0.002). The 3D structure showed larger microcolonies and distinct distribution of Sm-derived exopolysaccharides in dual-species biofilms. Compared with dual-species biofilms, expression of gtfB (ASP) and nox1 (oxidative stress) was higher for single-species of Sm whilst expression of BGL2 (matrix), PHR1 (matrix, acid tolerance) and SOD1 (oxidative stress) was higher in single-species of Ca. There was no difference for acid tolerance genes (Sm atpD and Ca PHR2), which was confirmed by acid tolerance challenge. Dual-species biofilms were more tolerant to oxidative and antimicrobial stresses (p < 0.05). Conclusions: Dual-species biofilms present greater 3D complexity, thereby, making them more resistant to stress conditions.

SUBMITTER: Lobo CIV 

PROVIDER: S-EPMC6807867 | biostudies-literature | 2019

REPOSITORIES: biostudies-literature

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Dual-species biofilms of <i>Streptococcus mutans</i> and <i>Candida albicans</i> exhibit more biomass and are mutually beneficial compared with single-species biofilms.

Lobo Carmélia Isabel Vitorino CIV   Rinaldi Talita Baptista TB   Christiano Chiara Mikaella Somogyi CMS   De Sales Leite Luana L   Barbugli Paula Aboud PA   Klein Marlise Inêz MI  

Journal of oral microbiology 20190320 1


<b>Background</b>: <i>Streptococcus mutans</i> (<i>Sm</i>) and <i>Candida albicans</i> (<i>Ca</i>) are found in biofilms of early childhood caries. <b>Objective:</b> To characterize <i>in vitro</i> dual- and single-species biofilms of <i>Sm</i> and <i>Ca</i> formed on saliva-coated hydroxyapatite discs in the presence of sucrose. <b>Design:</b> Evaluation of biofilms included biochemical [biomass, proteins, matrix's water-soluble (WSP) and alkali-soluble (ASP) polysaccharides, microbiological, 3  ...[more]

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