Effect of Long-Snake Moxibustion on Gut Microbiota of Patients with Ankylosing Spondylitis

Objective: The objectively was to study the effect of long-snake moxibustion intervention on gut microbiota of patients with ankylosing spondylitis (AS) by 16S rDNA sequencing technology. Methods: Thirty AS patients and 30 healthy volunteers were recruited and treated with long-snake moxibustion once a week for 12 weeks. AS patients were divided into pretreatment and posttreatment groups. VAS, BASDAI, and BASFI scores of AS patients before and after treatment were collected. 16S rDNA high-throughput sequencing technology was used to analyze the characteristics and differences of gut microbiota in AS patients before and after treatment and in healthy volunteers. Results: VAS, BASDAI, and BASFI scores of AS patients after long-snake moxibustion treatment were lower than those of pretreatment group (p < 0.05). The results of gut microbiota alpha diversity showed that Ace and Chao1 index of the posttreatment group were higher than those of the health group (p < 0.05), but there was no statistical significance in Ace and Chao1 index between the pretreatment group and the posttreatment group (p > 0.05). Beta diversity analysis showed that mild classification aggregation occurred between the health group and the pretreatment group but did not reach a significant level, and there was no significant difference between the pretreatment group and the posttreatment group. The results of species abundance showed that, at the phylum level, compared with the health group, the relative abundance of Firmicutes and Proteobacteria decreased in the pretreatment group, while the relative abundance of Bacteroidetes and Actinobacteria increased. Compared with the pretreatment group, the relative abundance of Firmicutes increased and the relative abundance of Actinobacteria decreased in the posttreatment group, but there were no statistically significant differences in the above changes (p > 0.05). At the genus level, compared with the health group, the relative abundances of Subdoligranulum in the pretreatment group were increased (p < 0.05), while the relative abundances of Bifidobacterium and Streptococcus were decreased (p < 0.05). Compared with the pretreatment group, the relative abundance of Romboutsia in the posttreatment group was increased (p < 0.05). Conclusion: Long-snake moxibustion can obviously improve the clinical symptoms of AS patients. The possible mechanism of action is related to regulating the abundance of gut microbiota, increasing beneficial bacteria, and restoring the homeostasis of gut microorganisms.