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Updated: Jan 26, 2026

Murine Fecal Isolation and Microbiota Transplantation
Published on: May 26, 2023
Relationship Between the Fecal Microbiota and Depression and Anxiety in Pediatric Patients With Orthostatic
Wakako Ishii1,2, Shihoko Komine-Aizawa3,2, Chika Takano1,2
1Department of Pediatrics and Child Health, Nihon University School of Medicine, Tokyo, Japan.
Insights
Children with orthostatic intolerance (OI) have altered gut bacteria, with specific changes linked to depression. Intestinal flora may be a new target for managing pediatric OI and mental health.
Area of Science:
- Microbiome research
- Pediatric gastroenterology
- Child and adolescent psychiatry
Background:
- Orthostatic intolerance (OI) is a significant health issue in children and adolescents.
- Psychosocial factors influence OI onset and severity.
- The role of intestinal microbiota in pediatric mental health is not well understood.
Purpose of the Study:
- To investigate the intestinal microbiota in children with OI.
- To explore the relationship between intestinal microbiota and mental health in pediatric OI patients.
Main Methods:
- Analysis of 56 fecal samples from pediatric OI patients and 9 from healthy children using terminal-restriction fragment length polymorphism.
- Assessment of bacterial diversity via Shannon-Wiener and Simpson indices.
- Evaluation of mental health using the Children's Depression Inventory and Children's Manifest Anxiety Scale.
Main Results:
- A higher proportion of Clostridium subcluster XIVa and/or Enterobacteriaceae was observed in pediatric OI patients compared to controls (P = .02).
- Bifidobacterium was less frequent in OI patients with depression than in those without depression.
- No correlation was found between depression, anxiety, and overall bacterial diversity.
Conclusions:
- Pediatric patients with OI exhibit distinct alterations in their intestinal bacterial flora.
- Intestinal microbiota represents a potential novel therapeutic target for managing treatment-resistant pediatric OI and associated mental health conditions.
Objective:
Orthostatic intolerance (OI) is an important health problem for children and adolescents. The onset and exacerbation of OI are strongly affected by psychosocial factors. Intestinal microbial deviations, which are affected by food and lifestyle factors, are an important risk factor for adult psychiatry patients, but their roles in pediatric patients are unclear. The objective of this study was to investigate the intestinal microbiota and its involvement in the mental health of children with OI.
Methods:
Fifty-six fecal samples from pediatric OI patients and 9 samples from healthy children were examined with terminal-restriction fragment length polymorphism analysis from July 2016 to January 2018 at Nihon University Itabashi Hospital, Tokyo, Japan. Bacterial diversity was analyzed using the Shannon-Wiener index and the Simpson index. All OI patients were assessed using 2 different psychological scales: the Children's Depression Inventory and the Children's Manifest Anxiety Scale. The patients were then divided into the following subgroups: depression or nondepression and anxiety or nonanxiety.
Results:
The mean proportion of Clostridium subcluster XIVa and/or Enterobacteriaceae (operational taxonomic unit [OTU] 940) in the OI patients was significantly higher than that in the healthy controls (P = .02). Among OI patients, Bifidobacterium (OTU 124) was less frequent in the depression group than in the nondepression group. However, depression and anxiety showed no correlation with bacterial diversity.
Conclusions:
Pediatric OI patients showed deviations in the intestinal bacterial flora. The intestinal flora can serve as a novel therapeutic target for the mental health management of intractable pediatric OI patients.
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