Pterostilbene supresses inflammation-induced melanoma metastasis by impeding neutrophil elastase-mediated thrombospondin-1 degradation  

作　　者：Dan Su Shan Xu Kailin Ji Hailing Xu Yan Li Zhisheng Zhang Yuqing Shen Gaoyang Chen 

机构地区：[1]Department of Pharmacy,Changzhou No.2 People’s Hospital,Affiliated Hospital of Nanjing Medical University,Changzhou 213004,China [2]School of Pharmacy,Changzhou University,Changzhou 213164,China [3]Department of Oncology,The Second People’s Hospital of Taizhou,Taizhou 225300,China

出　　处：《Chinese Herbal Medicines》2023年第1期94-101,共8页中草药（英文版）

基　　金：supported by the Key Project of Health Commission of Changzhou (No. ZD201911);Applied Basic Research Program of Changzhou Municipal Science and Technology Burean (No. CJ20209014);Program of Taizhou Municipal Bureau of Science and Technology (No. TZ201831)。

摘　　要：Objective: Chronic inflammation plays a fatal role in tumor metastasis. Pterostilbene(PTE) is a natural dimethylated analogue of resveratrol with anticancer and anti-inflammatory activities. This study aimed to investigate the inhibitory effect of PTE on inflammation-associated metastasis and explore the underlying mechanisms.Methods: Lipopolysaccharide(LPS)-induced lung inflammation and melanoma metastasis models were established in mice. After PTE treatment for four weeks, the organ index, histological changes, proinflammatory cytokines, and the expression and activity of neutrophil elastase(NE), a biomarker of neutrophil influx in the lungs, were analysed. Additionally, direct effects of PTE on NE-induced B16 cell migration were explored in wound healing and Transwell assays, and the expression of thrombospondin-1(TSP-1) and epithelial-mesenchymal transition(EMT) markers were also detected.Results: PTE obviously attenuated the LPS-induced metastasis of circulatory B16 cells to lungs by reducing the number of metastatic nodules on the lung surfaces and the lung weight/body weight ratio. PTE treatment also significantly reduced LPS-activated increase levels of tumor necrosis factor(TNF)-a and interleukin(IL)-6 in the lungs of tumor-bearing mice. In addition, increased expression and enzyme activity of NE and decreased expression of TSP-1 were observed, and these were blocked by PTE. In vitro, PTE at concentrations without cytotoxicity also markedly suppressed NE-triggered B16 cell migration, prevented NE-induced TSP-1 proteolysis and reversed the expression of vimentin, N-cadherin and Ecadherin.Conclusion: PTE could block inflammation-enhanced tumor metastasis, and the underlying mechanism might be associated with the inhibition of NE-mediated TSP-1 degradation.

关 键 词：INFLAMMATION MELANOMA METASTASIS neutrophil elastase PTEROSTILBENE thrombospondin-1 

分 类 号：R285.5[医药卫生—中药学]