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Published in: Osteoporosis International 1/2021

Open Access 01-01-2021 | Osteoporosis | Original Article

Association between gut microbiota, bone metabolism, and fracture risk in postmenopausal Japanese women

Authors: D. Ozaki, R. Kubota, T. Maeno, M. Abdelhakim, N. Hitosugi

Published in: Osteoporosis International | Issue 1/2021

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Abstract

Introduction

We investigated the relationship between gut microbiota composition and osteoporosis/fracture risk in Japanese postmenopausal women using 16S rRNA gene sequencing, FRAX, bone mineral density, biochemical bone parameters, and a self-administered questionnaire. Variation in abundance of specific microbiota was found to be significantly associated with fracture risk and vitamin K levels.
Gut microbiota data with respect to bone metabolism and fracture risk is limited. Vitamin K is produced by certain intestinal bacteria and has been reported to play a role in maintaining bone quality.

Purpose

We investigated relationships among gut microbiota composition, bone metabolism, and fracture risk in postmenopausal Japanese women.

Methods

Bone mineral density (BMD) was evaluated in 38 postmenopausal women (mean age 62.9 years) using forearm dual-energy X-ray absorptiometry. We collected and analyzed serum bone turnover markers (vitamin K fraction and tartrate-resistant acid phosphatase 5b; TRACP-5b), gut microbiota profiling (16S rRNA gene sequencing), and self-administered questionnaire data, including fracture history and vitamin K intake. Vitamin K2, BMD, and TRACP-5b data were divided into high- and low-level groups using cutoff values of 0.06 ng/mL, 87.05%, and 420 mU/dL, respectively; the proportions of bacteria were analyzed. Fracture incidence and relative risk were investigated for each bacterium.

Results

The genus Bacteroides was predominant in the high vitamin K2 group (29.73% vs 21.58%, P = 0.022). Fracture incidence was significantly higher in the low Bacteroides group, with a 5.6-times higher risk ratio of fracture history.
The family Rikenellaceae was more abundant in the low BMD group and more abundant in the high TRACP-5b group (2.15% vs 0.82%, P = 0.004; 2.38% vs 1.12%, P = 0.013, respectively).

Conclusion

Bacteroides and Rikenellaceae may be involved in bone metabolism and fracture risk. Further investigations of the underlying microbiota-related pathways in bone metabolism may reveal treatment strategies, and facilitate the prevention of osteoporosis.
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Metadata
Title
Association between gut microbiota, bone metabolism, and fracture risk in postmenopausal Japanese women
Authors
D. Ozaki
R. Kubota
T. Maeno
M. Abdelhakim
N. Hitosugi
Publication date
01-01-2021
Publisher
Springer London
Published in
Osteoporosis International / Issue 1/2021
Print ISSN: 0937-941X
Electronic ISSN: 1433-2965
DOI
https://doi.org/10.1007/s00198-020-05728-y

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