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Gut microbiome-related metabolic changes in plasma of antibiotic-treated rats

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Abstract

The intestinal microbiota contributes to the metabolism of its host. Adequate identification of the microbiota’s impact on the host plasma metabolites is lacking. As antibiotics have a profound effect on the microbial composition and hence on the mammalian-microbiota co-metabolism, we studied the effects of antibiotics on the “functionality of the microbiome”—defined as the production of metabolites absorbed by the host. This metabolomics study presents insights into the mammalian-microbiome co-metabolism of endogenous metabolites. To identify plasma metabolites related to microbiome changes due to antibiotic treatment, we have applied broad-spectrum antibiotics belonging to the class of aminoglycosides (neomycin, gentamicin), fluoroquinolones (moxifloxacin, levofloxacin) and tetracyclines (doxycycline, tetracycline). These were administered orally for 28 days to male rats including blood sampling for metabolic profiling after 7, 14 and 28 days. Fluoroquinolones and tetracyclines can be absorbed from the gut; whereas, aminoglycosides are poorly absorbed. Hippuric acid, indole-3-acetic acid and glycerol were identified as key metabolites affected by antibiotic treatment, beside changes mainly concerning amino acids and carbohydrates. Inter alia, effects on indole-3-propionic acid were found to be unique for aminoglycosides, and on 3-indoxylsulfate for tetracyclines. For each class of antibiotics, specific metabolome patterns could be established in the MetaMap®Tox data base, which contains metabolome data for more than 550 reference compounds. The results suggest that plasma-based metabolic profiling (metabolomics) could be a suitable tool to investigate the effect of antibiotics on the functionality of the microbiome and to obtain insight into the mammalian-microbiome co-metabolism.

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Abbreviations

CKD:

Chronic kidney disease

HA:

Hippuric acid

IAA:

Indole-3-acetic acid

IPA:

Indole-3-propionic acid

IS:

3-Indoxylsulfate

GC:

Gas chromatography

LC:

Liquid chromatography

MOA:

Mode of action

MS:

Mass spectrometry

SPE:

Solid phase extraction

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Acknowledgements

We would like to thank Ms Irmgard Weber for her skillful assistance.

Funding

The authors have no relevant affiliations or financial involvement with any organization or entity with a financial interest in or financial conflict with the subject matter or materials discussed in the manuscript. This includes employment, consultancies, honoraria, stock ownership or options, expert testimony, grants or patents received or pending or royalties. No writing assistance was utilized in the production of this manuscript.

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Correspondence to B. van Ravenzwaay.

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Behr, C., Kamp, H., Fabian, E. et al. Gut microbiome-related metabolic changes in plasma of antibiotic-treated rats. Arch Toxicol 91, 3439–3454 (2017). https://doi.org/10.1007/s00204-017-1949-2

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  • DOI: https://doi.org/10.1007/s00204-017-1949-2

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