Fluoride Depletes Acidogenic Taxa in Oral but Not Gut Microbial Communities in Mice.

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Yasuda K, Hsu T, Gallini CA, Mclver LJ, Schwager E, Shi A, DuLong CR, Schwager RN, Abu-Ali GS, Franzosa EA, Garrett WS, Huttenhower C, Morgan XC

Fluoride Depletes Acidogenic Taxa in Oral but Not Gut Microbial Communities in Mice.

mSystems. 2017 Aug 8;2(4). pii: mSystems00047-17. doi: 10.1128/mSystems.00047-17. eCollection 2017 Jul-Aug.

PubMed ID

28808691 [ View in PubMed

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Abstract

Fluoridation of drinking water and dental products prevents dental caries primarily by inhibiting energy harvest in oral cariogenic bacteria (such as Streptococcus mutans and Streptococcus sanguinis), thus leading to their depletion. However, the extent to which oral and gut microbial communities are affected by host fluoride exposure has been underexplored. In this study, we modeled human fluoride exposures to municipal water and dental products by treating mice with low or high levels of fluoride over a 12-week period. We then used 16S rRNA gene amplicon and shotgun metagenomic sequencing to assess fluoride's effects on oral and gut microbiome composition and function. In both the low- and high-fluoride groups, several operational taxonomic units (OTUs) belonging to acidogenic bacterial genera (such as Parabacteroides, Bacteroides, and Bilophila) were depleted in the oral community. In addition, fluoride-associated changes in oral community composition resulted in depletion of gene families involved in central carbon metabolism and energy harvest (2-oxoglutarate ferredoxin oxidoreductase, succinate dehydrogenase, and the glyoxylate cycle). In contrast, fluoride treatment did not induce a significant shift in gut microbial community composition or function in our mouse model, possibly due to absorption in the upper gastrointestinal tract. Fluoride-associated perturbations thus appeared to have a selective effect on the composition of the oral but not gut microbial community in mice. Future studies will be necessary to understand possible implications of fluoride exposure for the human microbiome. IMPORTANCE Fluoride has been added to drinking water and dental products since the 1950s. The beneficial effects of fluoride on oral health are due to its ability to inhibit the growth of bacteria that cause dental caries. Despite widespread human consumption of fluoride, there have been only two studies of humans that considered the effect of fluoride on human-associated microbial communities, which are increasingly understood to play important roles in health and disease. Notably, neither of these studies included a true cross-sectional control lacking fluoride exposure, as study subjects continued baseline fluoride treatment in their daily dental hygiene routines. To our knowledge, this work (in mice) is the first controlled study to assess the independent effects of fluoride exposure on the oral and gut microbial communities. Investigating how fluoride interacts with host-associated microbial communities in this controlled setting represents an effort toward understanding how common environmental exposures may potentially influence health.

DrugBank Data that Cites this Article

Drug Enzymes

Drug	Enzyme	Kind	Organism	Pharmacological Action	Actions
Sodium fluoride	Enolase	Protein	Streptococcus mutans	Unknown	Inhibitor	Details
Sodium fluoride	Enolase	Protein	Lactobacillus casei (strain BL23)	Unknown	Inhibitor	Details
Sodium fluoride	Enolase	Protein	Streptococcus sanguinis (strain SK36)	Unknown	Inhibitor	Details
Sodium fluoride	Enolase	Protein	Streptococcus salivarius	Unknown	Inhibitor	Details