| Summary: | Dong Zhang,1,2 Siwei Duan,3 Zhangyou He,4 Zeming Zhu,3 Zhiping Li,3 Qincheng Yi,4 Tiantian Cai,1,2 Juanjuan Li,1,2 Nan Chen,1,2 Shaoju Guo1,2 1Gastrointestinal Ward, The Fourth Clinical Medical College of Guangzhou University of Chinese Medicine, Shenzhen, People’s Republic of China; 2Gastrointestinal Ward, Shenzhen Hospital of Traditional Chinese Medicine, Shenzhen, People’s Republic of China; 3Institute of Gastroenterology, Science and Technology Innovation Center of Guangzhou University of Chinese Medicine, Guangzhou, People’s Republic of China; 4Institute of Gastroenterology, Guangzhou University of Chinese Medicine, Guangzhou, People’s Republic of ChinaCorrespondence: Shaoju Guo, Gastrointestinal Ward, The Fourth Clinical Medical College of Guangzhou University of Chinese Medicine, Shenzhen, People’s Republic of China, Tel +86-0755-82571384, Email gsj1080@163.comPurpose: This study was conducted to explore the mechanism of Sijunzi Decoction (SJZ) in the treatment of ulcerative colitis (UC).Methods: The study aimed to investigate the active components and targets of SJZ in the treatment of UC by screening databases such as TCMSP, GeneCards, OMIM, Distinct, TTD, and Drugbank. An online Venn tool, Cytoscape 3.7.2, and Autodock Tools were used to analyze the components and targets. The study also used a mouse model of UC to further investigate the effects of SJZ. HE staining, immunofluorescence, ELISA, qPCR, and Western blot were used to detect various indices.Results: Eighty-three active components and 112 action targets were identified from SJZ, including 67 targets for treating UC-related NETs. The five core targets identified were AKT1, JUN, IL1B, PTGS2, and TNF, and molecular docking studies indicated that the five targets were well-docked with ginsenoside Rh2, isoflavones, and formononetin. Animal experiments demonstrated that SJZ could alleviate various parameters such as weight, colon length, spleen index, disease activity index, and intestinal pathology of the UC mice. Immunofluorescence and Western blot showed that SJZ could reduce the expression of IL1B and TNF in intestinal neutrophils while increasing the expression of Occludin. Cellular immunofluorescence suggests that SJZ can reduce the expression of TNF and IL1B in NETs. The qPCR results also suggested that SJZ could inhibit TNF signal. Furthermore, ELISA results suggested that SJZ could inhibit the expression of pro-inflammatory cytokines (TNF-α, IL-1β, IL-6) while promoting the expression of anti-inflammatory cytokines (IL-10, IL-37, TGF-β).Conclusion: SJZ treats UC by reducing the content of intestinal NETs, with primary targets on the NETs being IL1B and TNFand suppress TNF signal. The practical components of SJZ may be ginsenoside Rh2, isoflavones, and formononetin.Graphical Abstract: Keywords: ulcerative colitis, Sijunzi decoction, network pharmacology, IL1B, TNF
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