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No Effect of High Fat Diet-Induced Obesity on Spontaneous Reporter Gene Mutations in gpt Delta Mice
Takasu, Shinji,Ishii, Yuji,Matsushita, Kohei,Kuroda, Ken,Kijima, Aki,Kodama, Yukio,Ogawa, Kumiko,Umemura, Takashi Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.17
A large number of epidemiological studies have demonstrated that obesity is a risk factor for several human cancers. Several animal studies using rodents with diet-induced or genetic obesity have also demonstrated that obesity can promote tumor development. However, the effects of obesity on the early stages of carcinogenesis, and especially on the spontaneous occurrence of somatic gene mutations, remain unclear. To investigate the effects of obesity on the rate of spontaneous gene mutations, we performed reporter gene mutation assays in liver, kidney, and colon, organs in which obesity appears to be associated with cancer development on the basis of epidemiological or animal studies, in mice with high fat diet (HFD)-induced obesity. Six-week-old male and female C57BL/6 gpt delta mice were fed HFD or standard diet (STD) for 13 or 26 weeks. At the end of the experiments, reporter gene mutation assays of liver, kidney, and colon were performed. Final body weights and serum leptin levels of male and female mice fed HFD for 13 or 26 weeks were significantly increased compared with corresponding STD-fed groups. Reporter gene mutation assays of liver, kidney, and colon revealed that there were no significant differences in gpt or $Spi^-$ mutant frequencies between STD- and HFD-fed mice in either the 13-week or 26-week groups. These results indicate that HFD treatment and consequent obesity does not appear to influence the spontaneous occurrence of somatic gene mutations.
( Takashi Nonaka ),( Takaomi Kessoku ),( Yuji Ogawa ),( Shogo Yanagisawa ),( Tadahiko Shiba ),( Takashi Sakaguchi ),( Kazuhiro Atsukawa ),( Hisao Takahashi ),( Yusuke Sekino ),( Hiroshi Iida ),( Hirok 대한소화기기능성질환·운동학회 2013 Journal of Neurogastroenterology and Motility (JNM Vol.19 No.1
Background/Aims The aim of this study was to examine the convenience of the quality of life and utility evaluation survey technology (QUEST) questionnaire and the frequency scale for the symptoms of gastroesophageal reflux disease (FSSG) questionnaire as self-assessment diagnostic instrument. Methods This was a two-way crossover study conducted over 6 weeks from September 2010 to November 2010. The subjects were 60 consecutive patients admitted to the Hiratsuka city hospital with a gastrointestinal condition, regardless of the coexistence of heartburn. They were assigned to fill in both the QUEST and FSSG questionnaires in random order. We analyzed the time taken to complete the questionnaires, whether subjects asked any questions as they filled in the questionnaire, and the questionnaire scores. Results Comparison of the QUEST and the FSSG revealed significant differences in the completion time (196.5 vs. 97.5 seconds, respectively; P < 0.0001) and in whether subjects asked any questions (37 vs. 15 subjects, respectively; P < 0.0001). Completion time in QUEST scores of ≥ 4 was lower than < 4 (170.5 vs. 214.0 seconds, respectively; P = 0.022), and the QUEST score was significantly higher without questions than with question (3 vs. 1 points, respectively; P = 0.025). Conclusions This study revealed that the FSSG questionnaire may be easier for Japanese subjects to complete than the QUEST questionnaire. (J Neurogastroenterol Motil 2013; 19:54-60)
( Takashi Nonaka ),( Takaomi Kessoku ),( Yuji Ogawa ),( Kento Imajyo ),( Shogo Yanagisawa ),( Tadahiko Shiba ),( Takashi Sakaguchi ),( Kazuhiro Atsukawa ),( Hisao Takahashi ),( Yusuke Sekino ),( Eiji 대한소화기기능성질환·운동학회 2011 Journal of Neurogastroenterology and Motility (JNM Vol.17 No.3
Background/Aims The effects of Histamine-2 receptor antagonists and proton pump inhibitors on the gastrointestinal motility have not yet been sufficiently investigated. The aim of this study was to determine the effects of intravenous bolus administration of famotidine and omeprazole on the rate of gastric emptying using the continuous 13C breath test (BreathID system, Exalenz Bioscience Ltd, Israel). Methods Twelve healthy male volunteers participated in this randomized, 3-way crossover study. After fasting overnight, the subjects were randomly assigned to receive 20 mg of famotidine, 20 mg of omeprazole or 20 mL of saline alone by intravenous bolus injection before a test meal (200 kcal per 200 mL, containing 100 mg of 13C-acetate). Gastric emptying was monitored for 4 hours after the ingestion of test meal by the 13C-acetic acid breath test performed using the BreathID system. Results No significant differences in the calculated parameters, namely, the T1/2, Tlag, GEC, β and κ, were observed among the 3 test conditions. Conclusions The study revealed that intravenous administration of gastric acid suppressant drugs had no significant influence on the rate of gastric emptying in comparison with that of saline alone as a placebo. Our results indicating the absence of any effect of either famotidine or omeprazole on accelerating the rate of gastric emptying suggest that both medications can be administered safely to patients suffering from hemorrhagic peptic ulcers who need to be kept nil by mouth from the viewpoint of possible acceleration of gastrointestinal motility in the clinical setting.
Takashi Nonaka,Takaomi Kessoku,Yuji Ogawa,Shogo Yanagisawa,Tadahiko Shiba,Takashi Sakaguchi,Kazuhiro Atsukawa,Hisao Takahashi,Yusuke Sekino,Hiroshi Iida,Hiroki Endo,Yasunari Sakamoto,Tomoko Koide,Hiro 대한소화기 기능성질환∙운동학회 2013 Journal of Neurogastroenterology and Motility (JNM Vol.19 No.1
Background/Aims The aim of this study was to examine the convenience of the quality of life and utility evaluation survey technology (QUEST) questionnaire and the frequency scale for the symptoms of gastroesophageal reflux disease (FSSG) questionnaire as self-assessment diagnostic instrument. Methods This was a two-way crossover study conducted over 6 weeks from September 2010 to November 2010. The subjects were 60 consecutive patients admitted to the Hiratsuka city hospital with a gastrointestinal condition, regardless of the coexistence of heartburn. They were assigned to fill in both the QUEST and FSSG questionnaires in random order. We analyzed the time taken to complete the questionnaires, whether subjects asked any questions as they filled in the questionnaire, and the questionnaire scores. Results Comparison of the QUEST and the FSSG revealed significant differences in the completion time (196.5 vs. 97.5 seconds, respectively; P < 0.0001) and in whether subjects asked any questions (37 vs. 15 subjects, respectively; P < 0.0001). Completion time in QUEST scores of ≥ 4 was lower than < 4 (170.5 vs. 214.0 seconds, respectively; P = 0.022), and the QUEST score was significantly higher without questions than with question (3 vs. 1 points, respectively; P = 0.025). Conclusions This study revealed that the FSSG questionnaire may be easier for Japanese subjects to complete than the QUEST questionnaire.
Asako Nogami,Masato Yoneda,Michihiro Iwaki,Takashi Kobayashi,Yasushi Honda,Yuji Ogawa,Kento Imajo,Satoru Saito,Atsushi Nakajima 대한간학회 2023 Clinical and Molecular Hepatology(대한간학회지) Vol.29 No.-
Non-alcoholic fatty liver disease is currently the most common chronic liver disease, affecting up to 25% of the global population. Simple fatty liver, in which fat is deposited in the liver without fibrosis, has been regarded as a benign disease in the past, but it is now known to be prognostic. In the future, more emphasis should be placed on the quantification of liver fat. Traditionally, fatty liver has been assessed by histological evaluation, which requires an invasive examination; however, technological innovations have made it possible to evaluate fatty liver by non-invasive imaging methods, such as ultrasonography, computed tomography, and magnetic resonance imaging. In addition, quantitative as well as qualitative measurements for the detection of fatty liver have become available. In this review, we summarize the currently used qualitative evaluations of fatty liver and discuss quantitative evaluations that are expected to further develop in the future.