Abstract
Liver fibrosis is caused by a variety of pathogenic factors. It is mainly characterized by chronic liver damage mediated by the imbalance between extracellular matrix synthesis and degradation. If the injury factor cannot be removed for a long time, fibrosis will progress to cirrhosis or even cancer. The development of liver fibrosis is a very complex process which is related to the activation of hepatic stellate cells (HSCs), oxidative stress, and cytokines produced by immune cells. At present, screening of substances with anti-inflammatory activity from natural plant extracts has become a new research focus in the prevention and treatment of liver fibrosis. Mulberry twig is a commonly used traditional Chinese medicine. Pharmacological studies have shown that mulberry twig has anti-inflammatory and antioxidant activities. Thus, it is likely that Mulberry twig contains active substances with liver protection functions. The present study aimed to explore the effect of Mulberroside A (MulA), the main active ingredient from Mulberry twig, on acute liver injury induced by CCl4 in mice. MulA treatment could significantly alleviate the CCl4-induced liver injury, as evidenced by histological analysis and Masson staining. However, we observed that MulA inhibited the expressions of collagen I and α-SMA in livers of CCl4-treated mice but did not directly inhibit the proliferation and activation of HSCs. Finally, we analyzed the anti-inflammatory effect of MulA and demonstrated that it could markedly inhibit the pro-inflammatory cytokines release in liver tissues and in cultured macrophages, thereby alleviating liver fibrosis. Our findings suggest MulA as a potential therapeutic candidate for liver injury and inflammatory diseases.
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