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INTRODUCTION: The purpose of the present study was to evaluate the antiproliferative activity of dehydrocostus lactone against human BON-1 cancer cell lines and to explore the possible underlying mechanism. MATERIAL AND METHODS: MTT cell viability assay was used to determine cytotoxic effects of dehydrocostus lactone in BON-1 cells. Fluorescence and transmission electron microscopic (TEM) techniques were used to study the effect of the compound on cellular morphology and apoptosis. Flow cytometry was used to assess the effect on cell cycle phase distribution. Effects of the drug on cell apoptosis and mitochondrial membrane potential were analyzed by flow cytometry using annexin v and rhodamine-123 as fluorescent probes. RESULTS: The results of the present study indicated that dehydrocostus lactone significantly (p < 0.01) inhibited the growth of BON-1 cancer cells. These growth inhibitory effects of dehydrocostus lactone on BON-1 were found to be time and concentration-dependent. The IC50 of dehydrocostus lactone were found to be 71.9 µM and 52.3 µM at 24 and 48 h time intervals respectively. The growth inhibitory effects of dehydrocostus lactone were found to be due to loss of mitochondrial membrane potential, the induction of apoptosis and sub-G1 cell cycle arrest. CONCLUSIONS: Dehydrocostus inhibits in vitro gastrinoma cancer cell growth and therefore may prove beneficial in the management of gastrinoma cancer.
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OBJECTIVE: In this research, we explored the effect of long non-coding RNA (lncRNA) AOC4P on gastrointestinal stromal tumor (GIST) cells. MATERIALS AND METHODS: The expression of lncRNA AOC4P in tissues was detected by real-time PCR (RT-PCR). The epithelial-mesenchymal transition (EMT)-related proteins in tissues were analyzed by Western blot. The experiment included negative control group (CN), silence AOC4P group (si AOC4P), and silence negative control group (si CT). RT-PCR, MTT, Scratch, Transwell, and Annexin V-FITC methods were used to detect the expression of lncRNA AOC4P, cell proliferation, cell migration ability, cell invasion ability, and apoptosis, respectively. The EMT-related proteins including TGF-ß, ZEB1, Vimentin, Snail, and E-cadherin were analyzed by Western blot. RESULTS: The expression of lncRNA AOC4P and the expression of EMT-related proteins in high-risk GISTs were higher than that in low- and intermediate-risk GISTs (P<0.05). It was revealed that cell proliferative migration and invasive ability in si AOC4P group was decreased than that in CN and si CT groups (P<0.05), and cell apoptosis in si AOC4P group was higher than that in si CT group. The results of Western blot demonstrated that the expression of TGF-ß1, ZEB1, Vimentin, and Snail in si AOC4P group were lower than that in si CT and CN group (P<0.05), and the expression of E-cadherin in si AOC4P group was higher than that in si CT and CN group (P<0.05).
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Colorectal cancer is a common carcinoma of gastrointestinal tract, and its incidence is associated with genetic mutations, environment as well as inflammation. Recent studies have shown that many microorganisms may have played an important role in pathogenesis of colorectal cancer. The common bacteria involved in colorectal cancer are Streptococcus bovis, Helicobacter pylori, Escherichia coli, Bacteroides, and Fusobacterium, etc. The common viruses are Polyomavirus, Epstein Barr virus, Cytomegalovirus and Human papillomavirus, etc. The detailed mechanism of these microorganisms in the pathogenesis of colorectal cancer is unclear, and there are no reports on specific pathogenic microorganisms which cause the disease directly. The direction of future researches will focus on metagenome, metatranscriptome, and metaproteome of microorganisms associated with the incidence of colorectal cancer.