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  • Title: Suppression of colitis-associated carcinogenesis through modulation of IL-6/STAT3 pathway by balsalazide and VSL#3.
    Author: Do EJ, Hwang SW, Kim SY, Ryu YM, Cho EA, Chung EJ, Park S, Lee HJ, Byeon JS, Ye BD, Yang DH, Park SH, Yang SK, Kim JH, Myung SJ.
    Journal: J Gastroenterol Hepatol; 2016 Aug; 31(8):1453-61. PubMed ID: 26711554.
    Abstract:
    BACKGROUND AND AIM: Recent studies suggest that the anti-inflammatory agent balsalazide (BSZ) and probiotic agent VSL#3 have potential therapeutic benefits for the treatment of patients with inflammatory bowel disease. However, their effectiveness in preventing colitis-associated carcinogenesis (CAC) remains uncertain. The aim of the present study was to determine the chemopreventive effects of BSZ and VSL#3 in the murine azoxymethane (AOM)/dextran sodium sulfate (DSS) model. METHODS: C57B/L6J mice were randomly divided into four groups: CAC group, BSZ group, VSL#3 group, and BSZ + VSL#3 group. After 2 weeks, the AOM/DSS model was induced by AOM injection followed by two cycles of 2% DSS. RESULTS: During first and second cycles of DSS, the number of F4/80-positive macrophages was significantly lower in the drug-treated groups compared with the CAC group (P < 0.05). At the endpoint, the total numbers of tumors in the drug-treated groups were significantly low compared with the CAC group (P < 0.05), and the drug-treated groups had significantly lower F4/80-positive macrophages in the tumor stroma (P < 0.01). The protein production of macrophage inflammatory protein 1 beta, monocyte chemoattractant protein-1, interleukin (IL)-6, and IL-10 in the colon tissues decreased in concordance with the plasma concentrations of the cytokines (P < 0.05). The drug-treated groups revealed lower expression of p-STAT3 compared with the CAC group. In addition, BCL2 decreased, and BAX increased markedly in the BSZ + VSL#3 group. CONCLUSIONS: These results revealed that BSZ and VSL#3 have chemopreventive effects against CAC through IL-6/STAT3 suppression. BSZ and VSL#3 could be suitable options for chemoprevention of colorectal cancer.
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