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Ingestion of Lactobacillus helveticus WHH1889 improves depressive and anxiety symptoms induced by chronic unpredictable mild stress in mice

In: Beneficial Microbes
Authors:
K. Gao Key Laboratory of Food And Biological Engineering of Zhejiang Province, Hangzhou 310018, China P.R.
Research and Development Department, Hangzhou Wahaha Group Co., Ltd, Hangzhou 310018, China P.R.
College of Animal Science, MOE Key Laboratory of Molecular Animal Nutrition, Zhejiang University, Hangzhou 310058, China P.R.

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C.-L. Chen Key Laboratory of Food And Biological Engineering of Zhejiang Province, Hangzhou 310018, China P.R.
Research and Development Department, Hangzhou Wahaha Group Co., Ltd, Hangzhou 310018, China P.R.

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X.-Q. Ke Key Laboratory of Food And Biological Engineering of Zhejiang Province, Hangzhou 310018, China P.R.
Research and Development Department, Hangzhou Wahaha Group Co., Ltd, Hangzhou 310018, China P.R.

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Y.-X Yu Key Laboratory of Food And Biological Engineering of Zhejiang Province, Hangzhou 310018, China P.R.
Research and Development Department, Hangzhou Wahaha Group Co., Ltd, Hangzhou 310018, China P.R.

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S. Chen Key Laboratory of Food And Biological Engineering of Zhejiang Province, Hangzhou 310018, China P.R.
Research and Development Department, Hangzhou Wahaha Group Co., Ltd, Hangzhou 310018, China P.R.

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G.-C. Liu Key Laboratory of Food And Biological Engineering of Zhejiang Province, Hangzhou 310018, China P.R.
Research and Development Department, Hangzhou Wahaha Group Co., Ltd, Hangzhou 310018, China P.R.

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H.-F. Wang College of Animal Science, MOE Key Laboratory of Molecular Animal Nutrition, Zhejiang University, Hangzhou 310058, China P.R.

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Y.-J. Li Key Laboratory of Food And Biological Engineering of Zhejiang Province, Hangzhou 310018, China P.R.
Research and Development Department, Hangzhou Wahaha Group Co., Ltd, Hangzhou 310018, China P.R.
College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310058, China P.R.

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Emerging evidence indicates that the alterations in the gut microbiota-brain axis (GBA), which is the bilateral connection between the gut microbial communities and brain function, are involved in several mental illnesses, including depression. Certain probiotic strains have been revealed to improve depressive behaviours and the dysregulation of 5-hydroxytryptamine (5-HT) metabolism in depression. Here we evaluated the potential antidepressant effects of Lactobacillus helveticus strains using an in vitro enterochromaffin cell model (RIN14B). The L. helveticus strain WHH1889 was shown to significantly promote the level of 5-hydroxytryptamine (5-HTP, 5-HT precursor) and the gene expression of tryptophan hydroxylase 1 (Tph1), which is the key synthetase in the 5-HT biosynthesis in RIN14B cells. Ingestion of 0.2 ml WHH1889 (1´109 cfu/ml) in a chronic unpredictable mild stress (CUMS) mouse model of depression for five weeks normalised depressive and anxiety-like behaviours in the forced swim test, tail suspension test, sucrose preference test, and open field test. Meanwhile, the CUMS-induced elevated level of serum corticosterone and declined levels of hippocampal 5-HT and 5-HTP were reversed by WHH1889. Furthermore, the disturbances of the gut microbiome composition with reduced microbial diversity were also improved by WHH1889, accompanied by the increased colonic 5-HTP level and Tph1 gene expression. In summary, these findings indicate that WHH1889 exerts antidepressant-like effects on CUMS mice, which is associated with the modulations of the 5-HT/5-HTP metabolism and gut microbiome composition. Therefore, ingestion of the L. helveticus strain WHH1889 with antidepressant potentials may become an encouraging therapeutic option in the treatment of depression.

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