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Induction of let-7e gene expression attenuates oncogenic phenotype in HCT-116 colorectal cancer cells through targeting of DCLK1 regulation
Publication date: Available online 8 May 2019Source: Life SciencesAuthor(s): Alisa Khodadadi Kohlan, Massoud Saidijam, Razieh Amini, Pouria Samadi, Rezvan NajafiAbstractAimsMicroRNAs (miRNAs) are small noncoding RNAs that negatively control gene expression at the translational level. There are compelling evidences indicating that the expression of let-7e is downregulated in various cancers, however, the role of let-7e in colorectal cancer (CRC) and its mechanism has been remained unknown. Here, we investigated the potential role of let-7e in regulating CRC cells phenotypes.Main methodsLet-7e and DCLK1 siRNA were transfecte...
Source: Life Sciences - May 8, 2019 Category: Biology Source Type: research

Honokiol induces endoplasmic reticulum stress-mediated apoptosis in human lung cancer cells
Publication date: Available online 29 January 2019Source: Life SciencesAuthor(s): Jianfei Zhu, Shuonan Xu, Wenli Gao, Jianyu Feng, Guolong ZhaoAbstractAimsHonokiol is a hydroxylated biphenyl natural product and displays potent antitumor activity against several cancers including prostate cancer, melanoma, leukemia, and colorectal cancer. The present study was to investigate the in vitro activity of honokiol against A549 and 95-D human lung cancer cells.Main methodsA549 and 95-D cells were used with honokiol treatment. Cell viability was determined by CCK-8 assay. The cell migration and apoptosis were evaluated by wound hea...
Source: Life Sciences - January 29, 2019 Category: Biology Source Type: research

Specific Delivery of Delta-5-Desaturase siRNA via RNA Nanoparticles Supplemented with Dihomo-γ-Linolenic Acid for Colon Cancer Suppression
In this study, we employed RNA nanotechnology for specific delivery of D5D-siRNA to xenograft colon tumors using 3WJ RNA nanoparticles. When a targeting module, i.e., the EpCAM aptamer, was incorporated, the 3WJ pRNA nanoparticles were able specifically deliver D5D siRNA to human colon cancer HCA-7 cells both in vitro and in vivo, resulting in significant downregulation of D5D expression. Co-treatment with DGLA in combination with 3WJ-EpCAM-siRNA induced a higher DGLA/AA ratio and enhanced formation of 8-HOA at a threshold level, and in HCA-7 tumor-bearing mice, induced significant tumor suppression. We further confirmed t...
Source: Redox Biology - December 19, 2018 Category: Biology Source Type: research

Endoplasmic reticulum stress triggered by Soyasapogenol B promotes apoptosis and autophagy in colorectal cancer
Publication date: Available online 14 December 2018Source: Life SciencesAuthor(s): Luping Wang, Lu Yun, Xiaojun Wang, Liying Sha, Luning Wang, Yingying Sui, Hui ZhangAbstractAimColorectal cancer (CRC) is a common human malignancy which accounts for 600,000 deaths annually at the global level. Soyasapogenol B (Soy B), an ingredient of soybean, has been found to exert anti-proliferative activities in vitro in human breast cancer cells. The current study aimed to evaluate the efficacy of Soy B in suppressing CRC.Methods and materialsThe effect of Soy B on cell viability was assessed using the Cell Counting Kit-8 (CCK-8) assay...
Source: Life Sciences - December 14, 2018 Category: Biology Source Type: research

Cytosolic calcium mediates RIP1/RIP3 complex-dependent necroptosis through JNK activation and mitochondrial ROS production in human colon cancer cells.
In this study, a RIP1/RIP3 complex was formed in 2-methoxy-6-acetyl-7-methyljuglone (MAM)-treated HCT116 and HT29 colon cancer cells. With this formation, mitochondrial reactive oxygen species (ROS) levels increased, mitochondrial depolarization occurred, and ATP concentrations decreased. This process was identified as necroptosis. This finding was confirmed by experiments showing that MAM-induced cell death was attenuated by the pharmacological or genetic blockage of necroptosis signaling, including RIP1 inhibitor necrostatin-1s (Nec-1s) and siRNA-mediated gene silencing of RIP1 and RIP3, but was unaffected by caspase inh...
Source: Free Radical Biology and Medicine - April 14, 2017 Category: Biology Authors: Sun W, Wu X, Gao H, Yu J, Zhao W, Lu JJ, Wang J, Du G, Chen X Tags: Free Radic Biol Med Source Type: research

CQ synergistically sensitizes human colorectal cancer cells to SN-38/CPT-11 through lysosomal and mitochondrial apoptotic pathway via p53-ROS cross-talk.
In this study, we found the chemotherapy agent SN-38 induced autophagy in colorectal cancer (CRC) cells. However, inhibition of autophagy using a small molecular inhibitor 3-methyladenine (3-MA) and ATG5 siRNA did not increase SN-38-induced cytotoxicity in CRC cells. Notably, another autophagy inhibitor chloroquine (CQ) synergistically enhanced the anti-tumor activity of SN-38 in CRC cells with wild type (WT) p53. Subsequently, we identified a potential mechanism of this cooperative interaction by showing that CQ and SN-38 acted together to trigger reactive oxygen species (ROS) burst, upregulate p53 expression, elicit the ...
Source: Free Radical Biology and Medicine - January 24, 2017 Category: Biology Authors: Chen P, Luo X, Nie P, Wu B, Xu W, Shi X, Chang H, Li B, Yu X, Zou Z Tags: Free Radic Biol Med Source Type: research

TLR4 siRNA inhibits proliferation and invasion in colorectal cancer cells by downregulating ACAT1 expression
Publication date: Available online 10 May 2016 Source:Life Sciences Author(s): Kai Ye, Yiyang Wu, Yafeng Sun, Jian'an Lin, Jianhua Xu Aims Toll-like receptor 4 (TLR4) is involved in tumor development. Numerous studies have confirmed that TLR4 mediates processes in tumorigenesis, for example, inflammation, proliferation and invasion. However, the effects of TLR4 on colorectal cancer development have not been fully elucidated. The present study aimed to evaluate the effects and mechanisms of TLR4 on colorectal cancer development. Main methods The expression of TLR4 and Acyl coenzyme A cholesterol acyltransferase 1 (A...
Source: Life Sciences - May 10, 2016 Category: Biology Source Type: research

DHA-induced stress response in human colon cancer cells-focus on oxidative stress and autophagy.
Abstract Polyunsaturated fatty acids (PUFAs) are important constituents of the diet and health benefits of omega-3/n-3 PUFAs, especially eicosapentaenoic acid (EPA, 20:5n-3) and docosahexaenoic acid (DHA, 22:6n-3) have been well documented in relation to several diseases. Increasing evidence suggests that n-3 PUFAs may have anticancer activity and improve the effect of conventional cancer therapy. The mechanisms behind these effects are still unclear and need to be elucidated. We have examined the DHA-induced stress response in two human colon cancer cell lines, SW620 and Caco-2. SW620 cells are growth-inhibited a...
Source: Free Radical Biology and Medicine - November 13, 2015 Category: Biology Authors: Pettersen K, Monsen VT, Hakvåg Pettersen CH, Overland HB, Pettersen G, Samdal H, Tesfahun AN, Lundemo AG, Bjørkøy G, Schønberg S Tags: Free Radic Biol Med Source Type: research

Oxaliplatin activates the KEAP1/NRF2 antioxidant system conferring protection against the cytotoxicity of anticancer drugs.
Abstract Oxaliplatin is an important drug in the treatment of advanced metastatic colorectal cancer. NF-E2 P45-related factor 2 (NRF2) is a key transcription factor that controls genes encoding cytoprotective and detoxifying enzymes through antioxidant response elements (AREs) in their regulatory regions. Here, we report that oxaliplatin is an activator of the NRF2 signaling pathway, with up-regulation of ARE-driven genes and glutathione elevation. An injection of oxaliplatin into mice enhanced the expression of glutathione transferases and antioxidant enzymes in the small and large intestines of wild-type (WT) mi...
Source: Free Radical Biology and Medicine - February 17, 2014 Category: Biology Authors: Wang XJ, Li Y, Luo L, Wang H, Chi Z, Xin A, Li X, Wu J, Tang X Tags: Free Radic Biol Med Source Type: research