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Changyang Xing 1 Article
Basic Research
Supplementation of Clostridium butyricum Alleviates Vascular Inflammation in Diabetic Mice
Tian Zhou, Shuo Qiu, Liang Zhang, Yangni Li, Jing Zhang, Donghua Shen, Ping Zhao, Lijun Yuan, Lianbi Zhao, Yunyou Duan, Changyang Xing
Received April 21, 2023  Accepted July 10, 2023  Published online February 2, 2024  
DOI: https://doi.org/10.4093/dmj.2023.0109    [Epub ahead of print]
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Background
Gut microbiota is closely related to the occurrence and development of diabetes and affects the prognosis of diabetic complications, and the underlying mechanisms are only partially understood. We aimed to explore the possible link between the gut microbiota and vascular inflammation of diabetic mice.
Methods
The db/db diabetic and wild-type (WT) mice were used in this study. We profiled gut microbiota and examined the and vascular function in both db/db group and WT group. Gut microbiota was analyzed by 16s rRNA sequencing. Vascular function was examined by ultrasonographic hemodynamics and histological staining. Clostridium butyricum (CB) was orally administered to diabetic mice by intragastric gavage every 2 days for 2 consecutive months. Reactive oxygen species (ROS) and expression of nuclear factor erythroid-derived 2-related factor 2 (Nrf2) and heme oxygenase-1 (HO-1) were detected by fluorescence microscopy. The mRNA expression of inflammatory cytokines was tested by quantitative polymerase chain reaction.
Results
Compared with WT mice, CB abundance was significantly decreased in the gut of db/db mice, together with compromised vascular function and activated inflammation in the arterial tissue. Meanwhile, ROS in the vascular tissue of db/db mice was also significantly increased. Oral administration of CB restored the protective microbiota, and protected the vascular function in the db/db mice via activating the Nrf2/HO-1 pathway.
Conclusion
This study identified the potential link between decreased CB abundance in gut microbiota and vascular inflammation in diabetes. Therapeutic delivery of CB by gut transplantation alleviates the vascular lesions of diabetes mellitus by activating the Nrf2/HO-1 pathway.

Diabetes Metab J : Diabetes & Metabolism Journal