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Gut microbiome perturbations induced by bacterial infection affect arsenic biotransformation.

Abstract：

:Exposure to arsenic affects large human populations worldwide and has been associated with a long list of human diseases, including skin, bladder, lung, and liver cancers, diabetes, and cardiovascular disorders. In addition, there are large individual differences in susceptibility to arsenic-induced diseases, which are frequently associated with different patterns of arsenic metabolism. Several underlying mechanisms, such as genetic polymorphisms and epigenetics, have been proposed, as these factors closely impact the individuals' capacity to metabolize arsenic. In this context, the role of the gut microbiome in directly metabolizing arsenic and triggering systemic responses in diverse organs raises the possibility that perturbations of the gut microbial communities affect the spectrum of metabolized arsenic species and subsequent toxicological effects. In this study, we used an animal model with an altered gut microbiome induced by bacterial infection, 16S rRNA gene sequencing, and inductively coupled plasma mass spectrometry-based arsenic speciation to examine the effect of gut microbiome perturbations on the biotransformation of arsenic. Metagenomics sequencing revealed that bacterial infection significantly perturbed the gut microbiome composition in C57BL/6 mice, which in turn resulted in altered spectra of arsenic metabolites in urine, with inorganic arsenic species and methylated and thiolated arsenic being perturbed. These data clearly illustrated that gut microbiome phenotypes significantly affected arsenic metabolic reactions, including reduction, methylation, and thiolation. These findings improve our understanding of how infectious diseases and environmental exposure interact and may also provide novel insight regarding the gut microbiome composition as a new risk factor of individual susceptibility to environmental chemicals.

journal_name

Chem Res Toxicol

journal_title

Chemical research in toxicology

authors

Lu K,Cable PH,Abo RP,Ru H,Graffam ME,Schlieper KA,Parry NM,Levine S,Bodnar WM,Wishnok JS,Styblo M,Swenberg JA,Fox JG,Tannenbaum SR

doi

10.1021/tx4002868

subject

Has Abstract

pub_date

2013-12-16 00:00:00

pages

1893-903

issue

12

eissn

0893-228X

issn

1520-5010

journal_volume

26

pub_type

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