Article thumbnail

\u3cem\u3eCandida Albicans\u3c/em\u3e Stimulates \u3cem\u3eStreptococcus Mutans\u3c/em\u3e Microcolony Development via Cross-Kingdom Biofilm-Derived Metabolites

By Dongyeop Kim, Arjun Sengupta, Tagbo H. R Niepa, Byung-Hoo Lee, Aalim Weljie, Veronica S Freitas-Blanco, Ramiro M Murata, Kathleen J Stebe, Daeyeon Lee and Hyun Koo

Abstract

Candida albicans is frequently detected with heavy infection of Streptococcus mutans in plaque-biofilms from children affected with early-childhood caries, a prevalent and costly oral disease. The presence of C. albicans enhances S. mutans growth within biofilms, yet the chemical interactions associated with bacterial accumulation remain unclear. Thus, this study was conducted to investigate how microbial products from this cross-kingdom association modulate S. mutans build-up in biofilms. Our data revealed that bacterial-fungal derived conditioned medium (BF-CM) significantly increased the growth of S. mutans and altered biofilm 3D-architecture in a dose-dependent manner, resulting in enlarged and densely packed bacterial cell-clusters (microcolonies). Intriguingly, BF-CM induced S. mutans gtfBC expression (responsible for Gtf exoenzymes production), enhancing Gtf activity essential for microcolony development. Using a recently developed nanoculture system, the data demonstrated simultaneous microcolony growth and gtfB activation in situ by BF-CM. Further metabolites/chromatographic analyses of BF-CM revealed elevated amounts of formate and the presence of Candida-derived farnesol, which is commonly known to exhibit antibacterial activity. Unexpectedly, at the levels detected (25–50 μM), farnesol enhanced S. mutans-biofilm cell growth, microcolony development, and Gtf activity akin to BF-CM bioactivity. Altogether, the data provide new insights on how extracellular microbial products from cross-kingdom interactions stimulate the accumulation of a bacterial pathogen within biofilms

Topics: Biofilms, Microbial Ecology, Biochemical and Biomolecular Engineering, Chemical Engineering, Engineering
Publisher: ScholarlyCommons
Year: 2017
OAI identifier: oai:repository.upenn.edu:cbe_papers-1183
Provided by: ScholarlyCommons@Penn

Suggested articles


To submit an update or takedown request for this paper, please submit an Update/Correction/Removal Request.