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azoxymethane

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https://www.readbyqxmd.com/read/27921383/consumption-of-the-total-western-diet-differentially-affects-the-response-to-green-tea-in-rodent-models-of-chronic-disease-compared-to-the-ain93g-diet
#1
Robert E Ward, Abby D Benninghoff, Brett J Healy, Minghao Li, Bharath Vagu, Korry J Hintze
SCOPE: In pre-clinical studies investigating bioactive components, the efficacy of the bioactive is likely influenced by the basal diet provided to rodents. In this study, we hypothesized that a model bioactive, green tea extract (GTE), would have different effects on colon carcinogenesis, body composition, and lipid metabolism in mice fed a basal diet formulated to promote animal health and growth (AIN93G) as compared to a Western diet that emulates typical American intakes of micro- and macronutrients, the total Western diet (TWD)...
December 6, 2016: Molecular Nutrition & Food Research
https://www.readbyqxmd.com/read/27876571/fusobacterium-nucleatum-increases-proliferation-of-colorectal-cancer-cells-and-tumor-development-in-mice-by-activating-tlr4-signaling-to-nf%C3%AE%C2%BAb-upregulating-expression-of-microrna-21
#2
Yongzhi Yang, Wenhao Weng, Junjie Peng, Leiming Hong, Lei Yang, Yuji Toiyama, Renyuan Gao, Minfeng Liu, Mingming Yin, Cheng Pan, Hao Li, Bomin Guo, Qingchao Zhu, Qing Wei, Mary-Pat Moyer, Ping Wang, Sanjun Cai, Ajay Goel, Huanlong Qin, Yanlei Ma
BACKGROUND & AIMS: Nearly 20% of the global cancer burden can be linked to infectious agents. Fusobacterium nucleatum promotes tumor formation by epithelial cells via unclear mechanisms. We aimed to identify microRNAs (miRNAs) induced by F nucleatum and evaluate their ability to promote colorectal carcinogenesis in mice. METHODS: Colorectal cancer (CRC) cell lines were incubated with F nucleatum or control reagents and analyzed in proliferation and would healing assays...
November 19, 2016: Gastroenterology
https://www.readbyqxmd.com/read/27869785/classic-il-6r-signalling-is-dispensable-for-intestinal-epithelial-proliferation-and-repair
#3
K Aden, A Breuer, A Rehman, H Geese, F Tran, J Sommer, G H Waetzig, T M Reinheimer, S Schreiber, S Rose-John, J Scheller, P Rosenstiel
Inflammatory bowel disease is characterized by disturbed cytokine signalling in the mucosa. Inhibition of the proinflammatory interleukin (IL)-6 pathway is a promising new therapeutic strategy, but safety concerns arise as IL-6 signalling also contributes to epithelial repair of the intestinal mucosa. To which extent IL-6 classic or trans-signalling contributes to intestinal repair remains elusive. We tested the influence of IL-6 classic signalling on intestinal repair and proliferation. Whereas IL-6 induced STAT3 phosphorylation in the colonic cancer cell lines, primary non-malignant intestinal organoids did not respond to IL-6 classic signalling...
November 21, 2016: Oncogenesis
https://www.readbyqxmd.com/read/27869219/a-novel-role-of-spred2-in-the-colonic-epithelial-cell-homeostasis-and-inflammation
#4
Sakuma Takahashi, Teizo Yoshimura, Takahiro Ohkura, Masayoshi Fujisawa, Soichiro Fushimi, Toshihiro Ito, Junya Itakura, Sakiko Hiraoka, Hiroyuki Okada, Kazuhide Yamamoto, Akihiro Matsukawa
Rapid and adequate mucosal healing is important for a remission of ulcerative colitis (UC) patients. Here, we examined whether Spred2, a member of the Sprouty-related EVH1-domain-containing proteins that inhibit the Ras/Raf/ERK pathway, plays a role in colonic mucosal homeostasis and inflammation by using Spred2 knockout (KO) mice. We first detected increased epithelial cell proliferation and cadherin 1 expression in the colon of naïve Spred2 KO mice compared to wild-type mice. Interestingly, Spred2 KO mice were resistant to dextran sulfate sodium (DSS)-induced acute colitis as indicated by lower levels of body weight loss and disease activity index...
November 21, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27865352/plum-polyphenols-inhibit-colorectal-aberrant-crypt-foci-formation-in-rats-potential-role-of-the-mir-143-protein-kinase-b-mammalian-target-of-rapamycin-axis
#5
Nivedita Banerjee, Hyemee Kim, Stephen T Talcott, Nancy D Turner, David H Byrne, Susanne U Mertens-Talcott
The nutritional prevention of aberrant crypt foci by polyphenols may be a crucial step to dietary cancer prevention. The objective of this study was to determine the underlying mechanisms that contribute to the anti-inflammatory and antitumorigenic properties of plum (Prunus salicina L.) polyphenols, including chlorogenic acid and neochlorogenic acid, in azoxymethane (AOM)-treated rats. The hypothesis was that plum polyphenolics suppress AOM-induced aberrant crypt foci formation through alterations in the protein kinase B (AKT)/mammalian target of rapamycin (mTOR) pathway and relative micro-RNA expressions...
October 2016: Nutrition Research
https://www.readbyqxmd.com/read/27863401/isoliquiritigenin-decreases-the-incidence-of-colitis-associated-colorectal-cancer-by-modulating-the-intestinal-microbiota
#6
Minna Wu, Yaqi Wu, Baoguo Deng, Jinsong Li, Haiying Cao, Yan Qu, Xinlai Qian, Genshen Zhong
Imbalances in intestinal bacteria correlate with colitis-associated colorectal cancer (CAC). Traditional Chinese medicines have been used to adjust the gut microbiota, and isoliquiritigenin (ISL), a flavonoid extracted from licorice, has shown antitumor efficacy. In this study, the effects of ISL on CAC development and the gut microbiota were evaluated using an azoxymethane and dextran sulphate sodium (AOM/DSS)-induced mouse model of CAC (CACM). Histopathological analysis suggested that ISL reduced tumor incidence in vivo...
November 15, 2016: Oncotarget
https://www.readbyqxmd.com/read/27845862/bamboo-salt-suppresses-colon-carcinogenesis-in-c57bl-6-mice-with-chemically-induced-colitis
#7
Jaehyun Ju, Ga-Young Lee, Yoon-Se Kim, Hee Kyung Chang, Myoung-Sool Do, Kun-Young Park
The aim of our experiment was to evaluate the anticancer effect of bamboo salt (BS) on C57BL/6 mice in an azoxymethane (AOM)/dextran sodium sulfate (DSS)-induced colon cancer model. BS, solar salt, and purified salt were evaluated for their protective effects during AOM/DSS-induced colon carcinogenesis in C57BL/6 mice. BS, especially after baking for nine separate intervals (BS9x), suppressed colon carcinogenesis in the mice. BS9x decreased colon length shortening, weight-to-length ratios, and tumor counts...
November 2016: Journal of Medicinal Food
https://www.readbyqxmd.com/read/27845068/combination-of-metformin-and-vsl-3-additively-suppresses-western-style-diet-induced-colon-cancer-in-mice
#8
Eun-Ju Chung, Eun-Ju Do, Sang-Yeob Kim, Eun A Cho, Dong-Hee Kim, Sehyung Pak, Sung Wook Hwang, Hyo Jeong Lee, Jeong-Sik Byeon, Byong Duk Ye, Dong Hoon Yang, Sang Hyoung Park, Suk-Kyun Yang, Jin-Ho Kim, Seung-Jae Myung
Western-style diet (WD) and dysbiosis are known to be associated with colonic inflammation, which contributes to carcinogenesis. Metformin (Met) exerts anti-inflammatory effects to induce AMP-activated protein kinase (AMPK), resulting in suppressed protein synthesis and reduced cell proliferation. Probiotic VSL#3 (V) modifies microbial composition. We investigated the chemopreventive mechanisms of Met and V in WD-induced colitis-associated colon carcinogenesis. Male BALB/c mice were randomly divided into five groups: a control diet (CD) group, WD group, WD+ Met (250mg/kg/day) group, WD+V (1...
November 12, 2016: European Journal of Pharmacology
https://www.readbyqxmd.com/read/27835986/activins-and-their-related-proteins-in-colon-carcinogenesis-insights-from-early-and-advanced-azoxymethane-rat-models-of-colon-cancer
#9
Bassem Refaat, Adel Galal El-Shemi, Amr Mohamed Mohamed, Osama Adnan Kensara, Jawwad Ahmad, Shakir Idris
BACKGROUND: Activin-A may exert pro- or anti-tumorigenic activities depending on cellular context. However, little is known about its role, or the other mature activin proteins, in colorectal carcinoma (CRC). This study measured the expression of activin βA- & βB-subunits, activin type IIA & IIB receptors, smads 2/3/4/6/7 and follistatin in CRC induced by azoxymethane (AOM) in rats. The results were compared with controls and disseminated according to the characteristics of histopathological lesions...
November 11, 2016: BMC Cancer
https://www.readbyqxmd.com/read/27831561/rapidly-cycling-lgr5-stem-cells-are-exquisitely-sensitive-to-extrinsic-dietary-factors-that-modulate-colon-cancer-risk
#10
Eunjoo Kim, Laurie A Davidson, Roger S Zoh, Martha E Hensel, Michael L Salinas, Bhimanagouda S Patil, Guddadarangavvanahally K Jayaprakasha, Evelyn S Callaway, Clinton D Allred, Nancy D Turner, Brad R Weeks, Robert S Chapkin
The majority of colon tumors are driven by aberrant Wnt signaling in intestinal stem cells, which mediates an efficient route toward initiating intestinal cancer. Natural lipophilic polyphenols and long-chain polyunsaturated fatty acids (PUFAs) generally suppress Wnt- and NF-κB- (nuclear factor-κ light-chain enhancer of activated B-cell) related pathways. However, the effects of these extrinsic agents on colonic leucine-rich repeat-containing G-protein-coupled receptor 5-positive (Lgr5(+)) stem cells, the cells of origin of colon cancer, have not been documented to date...
November 10, 2016: Cell Death & Disease
https://www.readbyqxmd.com/read/27825961/repression-of-microrna-function-mediates-inflammation-associated-colon-tumorigenesis
#11
Takeshi Yoshikawa, Jianfeng Wu, Motoyuki Otsuka, Takahiro Kishikawa, Nobumi Suzuki, Akemi Takata, Motoko Ohno, Rei Ishibashi, Mari Yamagami, Ryo Nakagawa, Naoya Kato, Masaaki Miyazawa, Jiahuai Han, Kazuhiko Koike
BACKGROUND & AIMS: Little is known about the mechanisms by which chronic inflammation contributes to carcinogenesis, such as the development of colon tumors in patients with inflammatory bowel diseases. Specific microRNA (miRNAs) can function as suppressors or oncogenes, and widespread alterations in miRNA expression have been associated with tumorigenesis. We studied whether alterations in miRNA function contribute to inflammation-associated colon carcinogenesis. METHODS: We studied the effects of inflammatory cytokines such as tumor necrosis factor (TNF), interleukin-1 alpha (IL1A), and IL1 beta (IL1B) on miRNA function, measured by activity of reporter constructs containing miRNA-binding sites in their 3' untranslated regions, in human 293T embryonic kidney, Caco-2, HT29, and HCT116 colon carcinoma cells, as well as dicer +/+ and dicer -/- and Apobec3 +/+ and Apobec3 -/- mouse embryonic fibroblasts...
November 5, 2016: Gastroenterology
https://www.readbyqxmd.com/read/27824363/ability-of-lactobacillus-plantarum-ls-07-to-modify-intestinal-enzymes-activity-in-chronic-diseases-prevention
#12
Emília Hijová, Jozef Kuzma, Ladislav Strojný, Alojz Bomba, Izabela Bertková, Anna Chmelárová, Zdena Hertelyová, Veronika Benetinová, Jana Štofilová, Ľuboš Ambro
The ability of probiotic strain Lactobacillus plantarum LS/07 to modify the activity of intestinal bacterial enzymes - β-glucuronidase (β-GLUCUR), β-galactosidase (β-GAL), and β-glucosidase (β-GLU) in prevention of chronic diseases - cancer, atherosclerosis and dysbiosis was investigated. The male Sprague-Dawley rats were randomly divided into 12 experimental groups: controls groups - C (control), AT (atherosclerotic), CC (carcinogenic), dysbiotic groups - each group in combination with antibiotics (ATB), probiotics groups - in combinatioan with probiotic (PRO) alone, and each group with combination of antibiotic and probiotic (ATB+PRO)...
November 7, 2016: Acta Biochimica Polonica
https://www.readbyqxmd.com/read/27805617/oral-administration-of-a-recombinant-cholera-toxin-b-subunit-promotes-mucosal-healing-in-the-colon
#13
K J Baldauf, J M Royal, J C Kouokam, B Haribabu, V R Jala, K Yaddanapudi, K T Hamorsky, G W Dryden, N Matoba
Cholera toxin B subunit (CTB) is a component of a licensed oral cholera vaccine. However, CTB has pleiotropic immunomodulatory effects whose impacts on the gut are not fully understood. Here, we found that oral administration in mice of a plant-made recombinant CTB (CTBp) significantly increased several immune cell populations in the colon lamina propria. Global gene expression analysis revealed that CTBp had more pronounced impacts on the colon than the small intestine, with significant activation of TGFβ-mediated pathways in the colon epithelium...
November 2, 2016: Mucosal Immunology
https://www.readbyqxmd.com/read/27801847/different-susceptibilities-between-apoe-and-ldlr-deficient-mice-to-inflammation-associated-colorectal-carcinogenesis
#14
Takuji Tanaka, Takeru Oyama, Shigeyuki Sugie, Masahito Shimizu
Hypercholesterolemia resulting in atherosclerosis is associated with an increased risk of ischemic heart disease and colorectal cancer (CRC). However, the roles of apoliprotein (Apo) E (Apoe) and low-density lipoprotein (Ldl) receptor (Ldlr) in colorectal carcinogenesis have not yet been investigated. In this study, we examined the susceptibility of Apoe-deficient and Ldlr-deficient mice, which are genetic animal models of atherosclerosis to azoxymethane (AOM)/dextran sodium sulfate (DSS)-induced colorectal carcinogenesis...
October 28, 2016: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/27797827/anti-inflammatory-natural-product-goniothalamin-reduces-colitis-associated-and-sporadic-colorectal-tumorigenesis
#15
Débora Barbosa Vendramini-Costa, Ralph Francescone, David Posocco, Vivianty Hou, Oxana Dmitrieva, Harvey Hensley, João Ernesto de Carvalho, Ronaldo Aloise Pilli, Sergei Grivennikov
The tumor microenvironment offers multiple targets for cancer therapy, including pro-tumorigenic inflammation. Natural compounds represent an enormous source of new anti-inflammatory and anticancer agents. We previously showed that the styryl lactone goniothalamin (GTN) has promising antiproliferative and anti-inflammatory activities. Because inflammation is a major driver of colorectal cancer (CRC), we therefore evaluated the therapeutic and preventive potentials of GTN in colitis, colitis associated cancer (CAC) and spontaneous CRC...
October 24, 2016: Carcinogenesis
https://www.readbyqxmd.com/read/27768599/a-role-for-the-vitamin-d-pathway-in-non-intestinal-lesions-in-genetic-and-carcinogen-models-of-colorectal-cancer-and-in-familial-adenomatous-polyposis
#16
Yong-Sik Bong, Shahin Assefnia, Therese Tuohy, Deborah W Neklason, Randall W Burt, Jaeil Ahn, Hao-Wen J Jiang, Stephen W Byers
Vitamin D is implicated in the etiology of cancers of the gastrointestinal tract, usually characterized by alteration in the APC/β-catenin/TCF tumor suppressor pathway. The vitamin D receptor (VDR) is also implicated in cardiovascular and skin diseases as well as in immunity. Activated VDR can indirectly alter β-catenin nuclear localization and directly suppress β-catenin/TCF mediated transcriptional activity. We treated VDR null mice with the carcinogen azoxymethane (AOM) and generated mice bearing a mutated APC (hypomorph) on a VDR null background (Apc1638N/+Vdr-/-)...
October 19, 2016: Oncotarget
https://www.readbyqxmd.com/read/27730672/daikenchuto-tu-100-suppresses-tumor-development-in-the-azoxymethane-and-apc-min-mouse-models-of-experimental-colon-cancer
#17
Takumu Hasebe, Jun Matsukawa, Daina Ringus, Jun Miyoshi, John Hart, Atsushi Kaneko, Masahiro Yamamoto, Toru Kono, Mikihiro Fujiya, Yutaka Kohgo, Chong-Zi Wang, Chun-Su Yuan, Marc Bissonnette, Mark W Musch, Eugene B Chang
Chemopreventative properties of traditional medicines and underlying mechanisms of action are incompletely investigated. This study demonstrates that dietary daikenchuto (TU-100), comprised of ginger, ginseng, and Japanese pepper effectively suppresses intestinal tumor development and progression in the azoxymethane (AOM) and APC(min/+) mouse models. For the AOM model, TU-100 was provided after the first of six biweekly AOM injections. Mice were sacrificed at 30 weeks. APC(min/+) mice were fed diet without or with TU-100 starting at 6 weeks, and sacrificed at 24 weeks...
October 12, 2016: Phytotherapy Research: PTR
https://www.readbyqxmd.com/read/27701718/evaluation-of-nanocarrier-targeted-drug-delivery-of-capecitabine-pamam-dendrimer-complex-in-a-mice-colorectal-cancer-model
#18
Fatemeh Nabavizadeh, Hafseh Fanaei, Alireza Imani, Jalal Vahedian, Fahimeh Asadi Amoli, Jamal Ghorbi, Hamid Sohanaki, Seyed Mehdi Mohammadi, Ravieh Golchoobian
Capecitabine, an effective anticancer drug in colorectal cancer chemotherapy, may create adverse side effects on healthy tissues. In the present study, we first induced colon adenocarcinoma with azoxymethane, a carcinogen agent, and then investigated the potentiality of polyamidoamine (PAMAM) dendrimer to improve capecitabine therapeutic index and decrease its adverse side effects on healthy tissues like liver and bone marrow. Other variables such as nanoparticle concentrations have also been investigated. Drug loading concentration (DLC) and encapsulation efficiency (EE) were calculated for capecitabine/dendrimer complex...
August 2016: Acta Medica Iranica
https://www.readbyqxmd.com/read/27697726/prevention-of-azoxymethane-dextran-sodium-sulfate-induced-mouse-colon-carcinogenesis-by-processed-aloe-vera-gel
#19
Sun-A Im, Ji-Wan Kim, Hee-Suk Kim, Chan-Su Park, Eunju Shin, Seon-Gil Do, Young In Park, Chong-Kil Lee
The preventive effect of a processed Aloe vera gel (PAG) on colon carcinogenesis was examined using an azoxymethane (AOM)-initiated and dextran sodium sulfate (DSS)-promoted mouse colon carcinogenesis model. Oral administration of PAG (200, or 400mg/kg/day) significantly reduced the multiplicity of colonic adenomas and adenocarcinomas compared with the AOM/DSS only-treated mice. In the mice treated with 400mg/kg of PAG, adenoma and adenocarcinoma development was reduced to 80% and 60%, respectively, compared to 100% in the PAG-untreated AOM/DSS-treated mice...
September 30, 2016: International Immunopharmacology
https://www.readbyqxmd.com/read/27670445/dendrophthoe-pentandra-l-miq-extract-effectively-inhibits-inflammation-proliferation-and-induces-p53-expression-on-colitis-associated-colon-cancer
#20
Agustina Tri Endharti, Adisti Wulandari, Anik Listyana, Eviana Norahmawati, Sofy Permana
BACKGROUND: Indonesian mistletoe grows on various trees. Mango Mistletoes (Dendrophthoe pentandra) is one type of mistletoe that grown on mango tree (.benalu mangga in bahasa Indonesia). Our study used mistletoe as a parasitic plant that has been used for traditional medicine. It has been known that Dendrophtoe pentandra extract (DPE) anti-inflammatory and anticancer. Furthermore, it is necessary to follow-up study in vivo to evaluate the response to treatment of new cancer therapeutic agents...
September 26, 2016: BMC Complementary and Alternative Medicine
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