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azoxymethane

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https://www.readbyqxmd.com/read/28107678/nobiletin-and-its-colonic-metabolites-suppress-colitis-associated-colon-carcinogenesis-by-down-regulating-inos-inducing-antioxidative-enzymes-and-arresting-cell-cycle-progression
#1
Xian Wu, Mingyue Song, Zili Gao, Yue Sun, Minqi Wang, Fang Li, Jinkai Zheng, Hang Xiao
Nobiletin (NOB) is a major citrus polymethoxyflavone (PMF) with various beneficial biological activities. We reported previously that dietary NOB significantly inhibited colitis-associated colon carcinogenesis in azoxymethane (AOM)/dextran sulfate sodium (DSS)-treated mice, and the chemopreventive effects were associated with NOB metabolites found in the mouse colonic tissues. In this study, to better understand the role of colonic metabolites of NOB, we determined the anti-inflammation and anticancer effects of a mixture of NOB and its major metabolites (NOB-Met) at the concentrations equivalent to those found in colonic tissues of NOB-fed mice...
January 11, 2017: Journal of Nutritional Biochemistry
https://www.readbyqxmd.com/read/28105173/interleukin-6-promotes-tumor-progression-in-colitis-associated-colorectal-cancer-through-hif-1%C3%AE-regulation
#2
Jun Han, Qiulei Xi, Qingyang Meng, Jingzheng Liu, Yongxian Zhang, Yusong Han, Qiulin Zhuang, Yi Jiang, Qiurong Ding, Guohao Wu
Interleukin-6 (IL-6) is a well-known etiological factor of colitis-associated colorectal cancer (CAC) and has a significant role in CAC progression. In addition, hypoxia-inducible factor 1α (HIF-1α) serves a primary role in the progression of CAC. However, the association between IL-6 and HIF-1α during the progression of CAC remains unclear. To investigate this association, the present study induced CAC in a mouse model using azoxymethane and dextran sulfate sodium. In addition, an anti-IL-6 receptor antibody was used to inhibit IL-6...
December 2016: Oncology Letters
https://www.readbyqxmd.com/read/28094544/red-wine-and-pomegranate-extracts-suppress-cured-meat-promotion-of-colonic-mucin-depleted-foci-in-carcinogen-induced-rats
#3
Nadia M Bastide, Nathalie Naud, Gilles Nassy, Jean-Luc Vendeuvre, Sylviane Taché, Françoise Guéraud, Ditte A Hobbs, Gunter G Kuhnle, Denis E Corpet, Fabrice H F Pierre
Processed meat intake is carcinogenic to humans. We have shown that intake of a workshop-made cured meat with erythorbate promotes colon carcinogenesis in rats. We speculated that polyphenols could inhibit this effect by limitation of endogenous lipid peroxidation and nitrosation. Polyphenol-rich plant extracts were added to the workshop-made cured meat and given for 14 days to rats and 100 days to azoxymethane-induced rats to evaluate the inhibition of preneoplastic lesions. Colons of 100-d study were scored for precancerous lesions (mucin-depleted foci, MDF), and biochemical end points of peroxidation and nitrosation were measured in urinary and fecal samples...
January 17, 2017: Nutrition and Cancer
https://www.readbyqxmd.com/read/28089732/alox15-as-a-suppressor-of-inflammation-and-cancer-lost-in-the-link
#4
REVIEW
Rui Tian, Xiangsheng Zuo, Jonathan Jaoude, Fei Mao, Jennifer Colby, Imad Shureiqi
Mounting evidence supports a mechanistic link between inflammation and cancer, especially colon cancer. ALOX15 (15-lipoxygenase-1) plays an important role in the formation of key lipid mediators (e.g., lipoxins and resolvins) to terminate inflammation. ALOX15 expression is downregulated in colorectal cancer (CRC). Intestinally-targeted transgenic expression of ALOX15 in mice inhibited dextran sodium sulfate-induced colitis from promoting azoxymethane- induced colorectal tumorigenesis, demonstrating that ALOX15 can suppress inflammation-driven promotion of carcinogen-induced colorectal tumorigenesis and therefore ALOX15 downregulation during tumorigenesis is likely to enhance the link between colitis and colorectal tumorigenesis...
January 12, 2017: Prostaglandins & Other Lipid Mediators
https://www.readbyqxmd.com/read/28053962/the-effect-of-sex-on-the-azoxymethane-dextran-sulfate-sodium-treated-mice-model-of-colon-cancer
#5
Sun Min Lee, Nayoung Kim, Hee Jin Son, Ji Hyun Park, Ryoung Hee Nam, Min Hee Ham, Daeun Choi, Sung Hwa Sohn, Eun Shin, Young-Jae Hwang, Jihee Sung, Dong Ho Lee, Ha-Na Lee
BACKGROUND: The colitis-associated cancer exhibits different characteristics according to sex in the initiation and progression of the tumors. The aim of this study was to investigate the sex-associated difference in the azoxymethane/dextran sulfate sodium (AOM/DSS)-induced colitis-associated cancer model. METHODS: The AOM/DSS ICR mouse model was established to compare male with female, and then the severity of colitis-associated carcinogenesis was examined macroscopically and histologically regarding the number, size, and location of tumors...
December 2016: Journal of Cancer Prevention
https://www.readbyqxmd.com/read/28050783/daily-intake-of-high-fat-diet-with-lysophosphatidic-acid-rich-soybean-phospholipids-augments-colon-tumorigenesis-in-kyoto-apc-delta-rats
#6
Toshihiko Tsutsumi, Manami Inoue, Yoko Okamoto, Akira Ishihara, Akira Tokumura
BACKGROUND: Oral administration of lysophosphatidic acid (LPA) was shown to attenuate gastric ulceration in rats and mice but aggravate intestinal tumorigenesis in mice. AIMS: The present study examined whether dietary LPA induces or prevents development of colorectal tumor in rats. METHODS: Kyoto Apc Delta rats fed high-fat diet with or without an LPA-rich soybean phospholipid mixture (LSP, 0.1 or 1%) were treated with azoxymethane and dextran sodium sulfate to induce colorectal tumorigenesis...
January 3, 2017: Digestive Diseases and Sciences
https://www.readbyqxmd.com/read/28045548/vitamin-d-reduces-colitis-and-inflammation-associated-colorectal-cancer-in-mice-independent-of-nod2
#7
Ihsan Elimrani, Jamie Koenekoop, Serge Dionne, Valerie Marcil, Edgar Delvin, Emile Levy, Ernest G Seidman
Inflammatory bowel disease (IBD) patients are at increased risk of developing colorectal cancer (CRC). Vitamin D (vD) induces NOD2 gene expression, enhancing immunity, while deficiency impairs intestinal epithelial integrity, increasing inflammation. This study investigated the effect of vD on CRC in colitis, and if preventive benefits are mediated via NOD2. Inflammation-associated CRC was induced by treating C57BL/6J and Nod2(-/-) mice with azoxymethane (AOM) and dextran sodium sulfate (DSS) cycles (×3). vD-deficient mice displayed more severe colitis compared to vD-supplemented mice, with greater weight loss, higher colitis activity index, increased colonic weight/length ratios, and lower survival rates...
January 3, 2017: Nutrition and Cancer
https://www.readbyqxmd.com/read/28039905/ultraviolet-a-eye-irradiation-ameliorates-colon-carcinoma-induced-by-azoxymethane-and-dextran-sodium-sulfate-through-%C3%AE-endorphin-and-methionine-enkephalin
#8
Keiichi Hiramoto, Satoshi Yokoyama, Yurika Yamate
BACKGROUND: We previously reported that ultraviolet (UV) A eye irradiation reduces the ulcerative colitis induced by dextran sodium sulfate (DSS). This study examined the effects of UVA on colon carcinoma induced by azoxymethane (AOM) and DSS. METHODS: We irradiated the eyes of ICR mice with UVA at a dose of 110 kJ/m(2) using an FL20SBLB-A lamp for the experimental period. RESULTS: In mice treated with these drugs, the symptom of colon carcinoma was reduced by UVA eye irradiation...
December 31, 2016: Photodermatology, Photoimmunology & Photomedicine
https://www.readbyqxmd.com/read/28031321/inflammatory-hypoxia-induces-syndecan-2-expression-through-il-1%C3%AE-mediated-foxo3a-activation-in-colonic-epithelia
#9
Sojoong Choi, Heesung Chung, Heejeong Hong, So Yeon Kim, Seong-Eun Kim, Ju-Young Seoh, Chang Mo Moon, Eun Gyeong Yang, Eok-Soo Oh
Chronic inflammation is known to be a key causative factor in tumor progression, but we do not yet fully understand the molecular mechanism through which inflammation leads to cancer. Here, we report that the dextran sulfate sodium (DSS)-induced mouse model of chronic colitis is associated with increases in the serum level of IL-1β and the colonic epithelial expression of the cell-surface heparan sulfate proteoglycan, syndecan-2. We further show that IL-1β stimulated the transcription of syndecan-2 via NF-κB-dependent FOXO3a activation in normal colonic epithelial cells (CCD841CoN cells) and early-stage colon cancer cells (HT29 cells)...
December 28, 2016: FASEB Journal: Official Publication of the Federation of American Societies for Experimental Biology
https://www.readbyqxmd.com/read/27989839/cilostazol-and-enzymatically-modified-isoquercitrin-attenuate-experimental-colitis-and-colon-cancer-in-mice-by-inhibiting-cell-proliferation-and-inflammation
#10
Yumi Kangawa, Toshinori Yoshida, Kiyoshi Maruyama, Minako Okamoto, Tohru Kihara, Michi Nakamura, Masako Ochiai, Yoshitaka Hippo, Shim-Mo Hayashi, Makoto Shibutani
We previously reported the anti-inflammatory effects of cilostazol, a selective inhibitor of phosphodiesterase 3, and two antioxidants, enzymatically modified isoquercitrin and α-lipoic acid in a dextran sodium sulphate-induced colitis mouse model. We further examined the chemopreventive effects of these substances in a murine azoxymethane/dextran sodium sulphate -induced colorectal carcinoma model and compared the effects with those of the well-known anticancer natural plant pigment, anthocyanin. In addition, the effects on cell proliferation activity were evaluated in colon cancer cell lines and mucosal epithelial cells in a model of acute dextran sodium sulphate-induced colitis...
December 15, 2016: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/27965594/lack-of-adrenomedullin-results-in-microbiota-changes-and-aggravates-azoxymethane-and-dextran-sulfate-sodium-induced-colitis-in-mice
#11
Sonia Martínez-Herrero, Ignacio M Larrayoz, Judit Narro-Íñiguez, María J Villanueva-Millán, Emma Recio-Fernández, Patricia Pérez-Matute, José A Oteo, Alfredo Martínez
The link between intestinal inflammation, microbiota, and colorectal cancer is intriguing and the potential underlying mechanisms remain unknown. Here we evaluate the influence of adrenomedullin (AM) in microbiota composition and its impact on colitis with an inducible knockout (KO) mouse model for AM. Microbiota composition was analyzed in KO and wild type (WT) mice by massive sequencing. Colitis was induced in mice by administration of azoxymethane (AOM) followed by dextran sulfate sodium (DSS) in the drinking water...
2016: Frontiers in Physiology
https://www.readbyqxmd.com/read/27965474/a%C3%A3-a%C3%A3-berries-inhibit-colon-tumorigenesis-in-azoxymethane-dextran-sulfate-sodium-treated-mice
#12
Yoon Jin Choi, Yoon Jeong Choi, Nayoung Kim, Ryoung Hee Nam, Seonmin Lee, Hye Seung Lee, Ha-Na Lee, Young-Joon Surh, Dong Ho Lee
Background/Aims: The aim of this study was to investigate the protective effect of açaí against azoxymethane (AOM)/dextran sulfate sodium (DSS)-induced colorectal cancer development. Methods: The effect of açaí on tumorigenesis was assessed by evaluating tumor incidence, multiplicity and invasiveness in the mouse colon. The levels of myeloperoxidase (MPO) and proinflammatory cytokines (tumor necrosis factor α [TNF-α], interleukin [IL]-1β, and IL-6) were measured via enzyme-linked immunosorbent assay...
December 16, 2016: Gut and Liver
https://www.readbyqxmd.com/read/27935860/t-lymphocyte-shp2-deficiency-triggers-anti-tumor-immunity-to-inhibit-colitis-associated-cancer-in-mice
#13
Wen Liu, Wenjie Guo, Lihong Shen, Zhen Chen, Qiong Luo, Xiaolin Luo, Gen-Sheng Feng, Yongqian Shu, Yanhong Gu, Qiang Xu, Yang Sun
Nonresolving inflammation is involved in the initiation and progression process of tumorigenesis. Src homology 2 domain-containing tyrosine phosphatase 2 (SHP2) is known to inhibit acute inflammation but its role in chronic inflammation-associated cancer remains unclear. The role of SHP2 in T cells in dextran sulfate sodium (DSS)-induced colitis and azoxymethane-DSS-induced colitis-associated carcinogenesis was examined using SHP2CD4-/- conditional knockout mice. SHP2 deficiency in T cells aggravated colitis with increased level of pro-inflammatory cytokines including IFN-γ and IL-17A...
December 7, 2016: Oncotarget
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
#14
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
#15
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
#16
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
#17
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
#18
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
#19
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
#20
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
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