Shaoyao Gancao Decoction protects against dextran sulfate sodium-induced ulcerative colitis by down-regulating ferroptosis

Objectives Shaoyao Gancao Decoction (SGD) is a well-known Chinese herbal prescription used to treat ulcerative colitis (UC). This study was designed to evaluate the effect of SGD in dextran sulfate sodium-induced UC and to reveal the potential mechanism. Methods A UC mouse model was established by the administration of dextran sulfate sodium. The mice were given SGD extract intragastrically for 7 days. Histological pathology, inflammatory factors, and ferroptosis regulators were determined in vivo. In addition, ferroptotic Caco-2 cells were prepared to investigate the underlying mechanism of the effects of SGD. Key findings The results showed that SGD reduced the disease activity index, the level of inflammatory factors, and histological damage in mice with UC. Moreover, SGD down-regulated the level of ferroptosis in cells in colon tissue, as evidenced by a reduced iron overload, decreased glutathione depletion, and a lower level of malondialdehyde production, compared with the model group. Correspondingly, similar effects of SGD on ferroptosis were observed in Erastin-treated Caco-2 cells. The results of our in vitro reactive oxygen species assays and the changes in mitochondrial structure observed by scanning electron microscopy also supported these results. Conclusion Taken together, these findings suggest that SGD protected against UC by down-regulating ferroptosis in colonic tissue.

Automated summary

Objectives: This study aimed to evaluate the effect of Shaoyao Gancao Decoction (SGD) on ulcerative colitis (UC) and its potential mechanism. Key findings: SGD reduced disease activity index, inflammatory factors, and histological damage in UC mice. It also down-regulated ferroptosis in colon tissue by reducing iron overload, glutathione depletion, and malondialdehyde production. Conclusion: SGD protected against UC by modulating ferroptosis in colonic tissue.