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Lactiplantibacillus plantarum attenuates 2,4,6-trinitrobenzenesulfonic acid-induced ulcerative colitis in rats by regulating the inflammatory response, T helper 17 immune response, and intestinal permeability

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Abstract

Ulcerative colitis (UC) is an idiopathic chronic inflammatory bowel disease. The effect of current therapy is far from satisfactory; therefore, it is necessary to develop new UC therapeutic strategies. Lactiplantibacillus plantarum 21 (LAB 21) has a protective effect in UC. We investigated the underlying mechanisms of action of LAB 21 using UC rat models established by 2,4,6-trinitrobenzenesulfonic acid. The results showed that LAB 21 administration reduced the disease activity index, macroscopic scoring, and histopathological damage scores in UC rats. UC rats had up-regulated levels of tumor necrosis factor-α (TNF-α), interleukin (IL)-1β, IL-6, and IL-17A, and an increased percentage of T helper 17 (Th17) cells, while LAB 21 treatment inhibited the up-regulation of inflammatory cytokines level and Th17 cell proportion. Moreover, LAB 21 administration attenuated the decrease of E-cadherin, ZO-1, and Occludin proteins in UC rats, and inhibited toll-like receptor 4 (TLR4) expression and nuclear factor (NF)-κB nuclear translocation. In conclusion, this study demonstrates that LAB 21 exerts a protective effect in UC rats by inhibiting the TLR4/NF-κB pathway and inflammatory response, down-regulating the proportion of Th17 cells, and reducing intestinal permeability.

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Abbreviations

UC:

Ulcerative colitis

IBD:

Idiopathic chronic inflammatory bowel disease

LAB 21:

Lactiplantibacillus plantarum 21

TNF-α:

Tumor necrosis factor-α

IL:

Interleukin

Th17:

T helper 17

NF:

Nuclear factor

TLR4:

Toll-like receptor 4

TNBS:

2,4,6-Trinitrobenzenesulfonic acid

ELISA:

Enzyme-linked immunosorbent assay

FITC:

Fluorescein isothiocyanate

HRP:

Horseradish peroxidase

ECL:

Electrochemiluminescence

DAPI:

4′,6-Diamidino-2-phenylindole

ANOVA:

Analysis of variance (ANOVA)

SD:

Standard deviation

DAI:

Disease activity index

MS:

Macroscopic scoring

HDS:

Histopathological damage scores

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Funding

This study was supported by Natural Science Foundation of Zhejiang Province (LY17H030008), Medical and health science and technology plan of Zhejiang Province (2017KY190), and Medical and health science and technology plan of Zhejiang Province (2019KY253).

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Correspondence to Pei-Fen Zheng.

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Statement of ethics

All animal experimental procedures were approved by by the Institutional Animal Ethics Committee of Zhejiang Hospital (protocol number: 2017–033).

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The authors declare that they have no conflict of interest.

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Wang, WF., Zhou, F., Xu, S. et al. Lactiplantibacillus plantarum attenuates 2,4,6-trinitrobenzenesulfonic acid-induced ulcerative colitis in rats by regulating the inflammatory response, T helper 17 immune response, and intestinal permeability. Biologia 77, 2667–2676 (2022). https://doi.org/10.1007/s11756-022-01111-w

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  • DOI: https://doi.org/10.1007/s11756-022-01111-w

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