AUTHOR=Qin Qian , Yan Su , Yang Yang , Chen Jingfeng , Yan Hang , Li Tiantian , Gao Xinxin , Wang Youxiang , Li Ang , Wang Shoujun , Ding Suying 

TITLE=The Relationship Between Osteoporosis and Intestinal Microbes in the Henan Province of China

JOURNAL=Frontiers in Cell and Developmental Biology

VOLUME=9

YEAR=2021

URL=https://www.frontiersin.org/journals/cell-and-developmental-biology/articles/10.3389/fcell.2021.752990

DOI=10.3389/fcell.2021.752990

ISSN=2296-634X

ABSTRACT=<p>Osteoporosis (OP) is a chronic disease in the elderly, and China is entering an aging demographic trend. In recent years, increasing evidence has demonstrated that probiotics can treat osteoporosis. This study aimed to explore the relevant mechanisms and to validate the beneficial effect on osteoporosis by high-throughput metagenome-wide gene sequencing in humans. In this study, compared with controls, several species had altered abundances, and specific functional pathways were found in the OP group. At the species level, the species that had increased in OP individuals were positively correlated to bone resorption markers and negatively correlated to 25-OH-D3 and bone formation markers, with <italic>Streptococcus sanguinis</italic> showing the strongest relevance, followed by <italic>Streptococcus gordonii</italic>, <italic>Actinomyces odontolyticus</italic>, and <italic>Olsenella unclassified.</italic> Additionally, <italic>Actinomyces graevenitzii</italic>, enriched in the OP group, was positively correlated to inflammation indicators that included white blood cell (WBC), neutrophil count (NEC), and the neutrophil-to-lymphocyte ratio (NLR) (<italic>p</italic> &lt; 0.05). Conversely, the levels of <italic>Akkermansia muciniphila</italic>, <italic>Bacteroides eggerthii</italic>, <italic>Bacteroides fragilis</italic>, <italic>Bacteroides uniformis</italic>, and <italic>Butyricimonas synergistic</italic> were increased in the control group, which had a negative correlation with bone resorption markers and positive correlation with bone formation markers and 25-OH-D3. Additionally, <italic>Bacteroides fragilis</italic> had a negative correlation with inflammation indicators (WBC, NEC, and NLR) and the above pathways (<italic>p</italic> &lt; 0.05). Functional prediction revealed that 106 metabolic pathways, enriched in the OP group, were significantly higher than in the control group (<italic>p</italic> &lt; 0.05). In particular, pathways related to LPS biosynthesis, phytate degradation, lactate acid, and ethanol fermentation were more abundant in the OP group than in the control and were positively related to WBC and NEC. Taken together, several species with altered abundances and specific functional pathways were found in OP individuals. The role of phytases in OP provides novel epidemiological evidence to elucidate the underlying microbiota-relevant mechanisms in bone mineralization and should be explored further.</p>