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Gut microbiota and liver metabolomics reveal the potential mechanism of Lactobacillus rhamnosus GG modulating the liver toxicity caused by polystyrene microplastics in mice

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Abstract

Microplastics (MPs) are known to cause liver toxicity as they can spread through the food chain. Most researches on their toxicity have focused on individual organs, neglecting the crucial “gut-liver axis”—a bidirectional communication pathway between the gut and liver. Probiotics have shown promise in modulating the effects of environmental pollutants. In this study, we exposed mice to Lactobacillus rhamnosus GG (LGG, 100 mg/kg b.w./d) and/or polystyrene microplastics (PS-MPs, 5 mg/kg b.w./d) for 28 d via gavage to investigate how probiotics influence live toxicity through the gut-liver axis. Our results demonstrated that PS-MPs induced liver inflammation (increased IL-6 and TNF-α) and disrupted lipid metabolism. However, when combined with LGG, these effects were alleviated. LGG also improved colon health, rectifying ciliary defects and abnormal mucus secretion caused by PS-MPs. Furthermore, LGG improved gut microbiota dysbiosis induced by PS-MPs. Metabolomics and gene expression analysis (Cyp7a1 and Cyp7b1) indicated that LGG modulated bile acid metabolism. In summary, LGG appears to protect the liver by maintaining gut homeostasis, enhancing gut barrier integrity, and reducing the liver inflammation. These findings confirm the potential of LGG to modulate liver toxicity caused by PS-MPs through the gut-liver axis, offering insights into probiotics' application for environmental pollutant detoxification.

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Data availability

Data will be made available on request.

Abbreviations

MPs:

microplastics

PS-MPs:

polystyrene microplastics

TEM:

transmission electron microscopy

LGG:

Lactobacillus rhamnosus GG

SPF:

specific pathogen-free

DW:

distilled water

H&E:

Hematoxylin-eosin

AB-PAS:

Alcian Blue-Periodic Acid Schiff

PBS:

phosphate buffered saline

TP:

total protein

BCA:

bicinchoninic acid

ALT:

alanine aminotransferase

AST:

aspartate aminotransferase

SOD:

superoxide dismutase

GSH-PX:

glutathione peroxidase

LPS:

lipopolysaccharide

ELISA:

enzyme-linked immunosorbent assay

qRT-PCR:

quantitative real-time polymerase chain reaction

OTUs:

operational taxonomic units

PLS-DA:

partialleast squares discriminant analysis

UPGMA:

unweighted pair-group method with arithmetic mean

LDA:

Linear discriminant analysis

LEfse:

linear discriminant analysis effect size

UPLC-Q-TOF-MS:

ultra performance liquid chromatography- quadrupole-time of flight- mass spectrometer

QC:

quality control

KEGG:

the Kyoto Encylopaedia of Genes and Genomes

HMDB:

the Human Metabolome Database

OPLS-DA:

orthogonal partial least-squares discrimination analysis

FC:

fold change

VIP:

variable importance in projection

SCMs:

significantly changed metabolites

SD:

standard deviations

ANOVA:

a one-way analysis of variance

Keap1-Nrf2/ARE:

kelch-like ECH associated protein 1- nuclear factor-erythroid-2-related factor 2/ antioxidant response element

SCFAs:

short-chain fatty acids

TNF-α:

tumor necrosis factor-α

IL-6:

interleukin-6

Cyp7a1:

cytochrome P450 family 7 subfamily A member 1

Cyp7b1:

cytochrome P450 family 7 subfamily B member 1

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Funding

This study was supported by the National Natural Science Foundation of China (22306100) and the Natural Science Foundation of the Jiangsu Higher Education Institutions of China (NO. 23KJB610012).

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Authors and Affiliations

Authors

Contributions

Changhao Yu: Validation, Formal analysis, Investigation, Writing - original draft. Yawen Xu: Methodology, Investigation. Yiping Wei: Methodology, Investigation. Yuxue Guo: Investigation. Yi Wang: Investigation. Ping Song: Methodology, Supervision. Jing Yu: Conceptualization, Methodology, Software, Writing - review & editing, Funding acquisition, Project administration.

Corresponding author

Correspondence to Jing Yu.

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Ethics approval

All animal experimental procedures were approved by the Ethics Committee of Nanjing Normal University (IACUC-20230260).

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No human participant is involved in this study.

Consent for publication

All authors have read and agreed to publish the manuscript in this version.

Competing interests

The authors declare no competing interests.

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Responsible Editor: Diane Purchase

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Yu, C., Xu, Y., Wei, Y. et al. Gut microbiota and liver metabolomics reveal the potential mechanism of Lactobacillus rhamnosus GG modulating the liver toxicity caused by polystyrene microplastics in mice. Environ Sci Pollut Res 31, 6527–6542 (2024). https://doi.org/10.1007/s11356-023-31564-8

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  • DOI: https://doi.org/10.1007/s11356-023-31564-8

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