Analysis of therapeutic mechanism of Liushen Wan against colitis-associated colorectal cancer based on network pharmacology and validation in mice / 南方医科大学学报

OBJECTIVE@#To explore the therapeutic mechanism of Liushen Wan (LSW) against colitis-associated colorectal cancer (CAC) by network pharmacology.@*METHODS@#TCMSP, BATMAN-TCM, CNKI, PubMed, Genecards, OMIM, and TTD databases were used to obtain the related targets of LSW and CAC. The common targets of LSW and CAC were obtained using Venny online website. The PPI network was constructed using Cytoscape 3.8.2 to screen the core targets of LSW in the treatment of CAC. GO and KEGG enrichment analysis were conducted using DAVID database. The therapeutic effect of LSW on CAC was evaluated in a C57BL/6J mouse model of AOM/DSS-induced CAC by observing the changes in body weight, disease activity index, colon length, and size and number of the tumor. HE staining and RT-qPCR were used to analyze the effect of LSW on inflammatory mediators. Immunohistochemistry and TUNEL staining were used to evaluate the effect of LSW on the proliferation and apoptosis of AOM/DSS-treated colon tumor cells. Immunohistochemistry and Western blotting were used to detect the effects of LSW on the expression of TLR4 proteins in CAC mice.@*RESULTS@#Network pharmacology analysis identified 69 common targets of LSW and CAC, and 33 hub targets were screened in the PPI network. KEGG pathway enrichment analysis suggested that the effect of LSW on CAC was mediated by the Toll-like receptor signaling pathway. In the mouse model of AOM/DSS-induced CAC, LSW significantly inhibited colitis-associated tumorigenesis, reduced tumor number and tumor load (P < 0.05), obviously improved histopathological changes in the colon, downregulated the mRNA levels of proinflammatory cytokines, and inhibited the proliferation (P < 0.01) and promoted apoptosis of colon tumor cells (P < 0.001). LSW also significantly decreased TLR4 protein expression in the colon tissue (P < 0.05).@*CONCLUSION@#LSW can inhibit CAC in mice possibly by regulating the expression of TLR4 to reduce intestinal inflammation, inhibit colon tumor cell proliferation and promote their apoptosis.

Bufalin induces apoptosis of HCT116 cells by activating endoplasmic reticulum stress pathway / 安徽医科大学学报

Objective @#To study the effect of bufalin on the proliferation and apoptosis of human colorectal cancer cell line HCT116，and to explore the role of endoplasmic reticulum stress ( ERS) in this process．@*Methods @#The effect of bufalin on the proliferation of HCT116 cells was determined by CCK-8 assay．After HCT116 cells were treated with different concentrations of bufalin for 48 hours，cell apoptosis was detected by Annexin V / PI assay， and the expression of apoptosis-related proteins Bax and Bcl-2 was detected by Western blot．At the same time，the expression of ERS-related proteins glucose regulated protein 78 ( GRP78) ，phosphorylated protein kinase R like endoplasmic reticulum kinase ( p-PERK) ，eukaryotic translation initiation factor 2 α ( eIF2 α) ，phosphorylated eukaryotic translation initiation factor 2 α (p-eIF2 α) and C / EBP homologous protein ( CHOP) was detected by Western blot．HCT116 cells were divided into control group，bufalin group and combination group (bufalin + 4-phenylbutyric acid) ，and the expression of apoptosis-related proteins Bax and Bcl-2 was observed by Western blot. @*Results@#CCK-8 assay showed that bufalin could inhibit the proliferation of HCT116 cells．Apoptosis assay showed that bufalin could induce apoptosis of HCT116 cells．The results of Western blot showed that bufalin could up-regulate the expression of pro-apoptotic protein Bax and down-regulate the expression of anti-apoptotic protein Bcl-2．It could also induce ERS and activate PERK / eIF2 α/ CHOP pathway．When bufalin combined with 4-phenylbutyric acid，the apoptosis-promoting effect of bufalin was inhibited．@*Conclusion@#Bufalin can effectively inhibit the prolif- erative activity and induce apoptosis of HCT116，which is achieved to some extent by activating ERS.