Dysbiosis of the Gut Microbiota and Kynurenine (Kyn) Pathway Activity as Potential Biomarkers in Patients with Major Depressive Disorder

Lin, P; Li, D; Shi, Y; Li, Q; Guo, X; Dong, K; Chen, Q; Lou, X; Li, Z; Li, P; Jin, W; Chen, S; Sun, Y; Sun, J; Cheng, X

Dysbiosis of the Gut Microbiota and Kynurenine (Kyn) Pathway Activity as Potential Biomarkers in Patients with Major Depressive Disorder

Lin, P Li, D Shi, Y Li, Q Guo, X Dong, K Chen, Q Lou, X Li, Z Li, P Jin, W Chen, S Sun, Y Sun, J

Cheng, X

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Publisher:: MDPI AG
Publication Type:: Journal Article
Citation:: Nutrients, 15, (7), pp. 1752-1752

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Field	Value	Language
dc.contributor.author	Lin, P
dc.contributor.author	Li, D
dc.contributor.author	Shi, Y
dc.contributor.author	Li, Q
dc.contributor.author	Guo, X
dc.contributor.author	Dong, K
dc.contributor.author	Chen, Q
dc.contributor.author	Lou, X
dc.contributor.author	Li, Z
dc.contributor.author	Li, P
dc.contributor.author	Jin, W
dc.contributor.author	Chen, S
dc.contributor.author	Sun, Y
dc.contributor.author	Sun, J https://orcid.org/0000-0002-0097-2438
dc.contributor.author	Cheng, X
dc.date.accessioned	2023-04-07T12:16:44Z
dc.date.available	2023-04-07T12:16:44Z
dc.identifier.citation	Nutrients, 15, (7), pp. 1752-1752
dc.identifier.issn	2072-6643
dc.identifier.uri	http://hdl.handle.net/10453/169387
dc.description.abstract	<jats:p>With increasing attention paid to the concept of the microbiota–gut–brain axis, mounting evidence reveals that the gut microbiota is involved in a variety of neurological and psychiatric diseases. However, gut microbiota changes in major depressive disorder (MDD) patients and their association with disease mechanisms remain undefined. Fifty MDD patients and sixty healthy controls were recruited from the Shanghai Healthy Mental Center, China. Fecal samples were collected, and the compositional characteristics of the intestinal flora were determined in MDD patients by MiSeq sequencing. Venous blood was collected for the detection of plasma indoleamine-2,3-dioxygenase (Ido), kynurenine (Kyn) and tryptophan (Trp) levels. Stool samples of bacterial 16S sequencing was carried out. A total of 2,705,809 optimized sequences were obtained, with an average of 54,116 per sample. More unique OTUs were observed at the family, genus and species levels in the control group compared with the MDD cases. Further analysis showed significant changes in the α- and β-diversities and relative abundance levels of gut microbial entities in MDD patients, as well as elevated amounts of Ido and Kyn indicating Kyn pathway activation, KEGG bacterial 16S function prediction analysis shows a variety of amino acids and metabolic (including Ido, Trp and Kyn) changes in the body of patients with MDD. These may result in increased neurotoxic metabolites and reduced generation of serotonin in the disease process. These changed factors may potentially be utilized as biomarkers for MDD in the future, playing more important roles in the disease course.</jats:p>
dc.language	en
dc.publisher	MDPI AG
dc.relation.ispartof	Nutrients
dc.relation.isbasedon	10.3390/nu15071752
dc.rights	info:eu-repo/semantics/openAccess
dc.subject	0908 Food Sciences, 1111 Nutrition and Dietetics
dc.title	Dysbiosis of the Gut Microbiota and Kynurenine (Kyn) Pathway Activity as Potential Biomarkers in Patients with Major Depressive Disorder
dc.type	Journal Article
utslib.citation.volume	15
utslib.for	0908 Food Sciences
utslib.for	1111 Nutrition and Dietetics
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Computer Science
utslib.copyright.status	open_access	*
dc.date.updated	2023-04-07T12:16:42Z
pubs.issue	7
pubs.publication-status	Published online
pubs.volume	15
utslib.citation.issue	7

Abstract:

With increasing attention paid to the concept of the microbiota–gut–brain axis, mounting evidence reveals that the gut microbiota is involved in a variety of neurological and psychiatric diseases. However, gut microbiota changes in major depressive disorder (MDD) patients and their association with disease mechanisms remain undefined. Fifty MDD patients and sixty healthy controls were recruited from the Shanghai Healthy Mental Center, China. Fecal samples were collected, and the compositional characteristics of the intestinal flora were determined in MDD patients by MiSeq sequencing. Venous blood was collected for the detection of plasma indoleamine-2,3-dioxygenase (Ido), kynurenine (Kyn) and tryptophan (Trp) levels. Stool samples of bacterial 16S sequencing was carried out. A total of 2,705,809 optimized sequences were obtained, with an average of 54,116 per sample. More unique OTUs were observed at the family, genus and species levels in the control group compared with the MDD cases. Further analysis showed significant changes in the α- and β-diversities and relative abundance levels of gut microbial entities in MDD patients, as well as elevated amounts of Ido and Kyn indicating Kyn pathway activation, KEGG bacterial 16S function prediction analysis shows a variety of amino acids and metabolic (including Ido, Trp and Kyn) changes in the body of patients with MDD. These may result in increased neurotoxic metabolites and reduced generation of serotonin in the disease process. These changed factors may potentially be utilized as biomarkers for MDD in the future, playing more important roles in the disease course.

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