Abstract 1873: Effect of intermittent calorie restriction on cancer stem cells.

Abstract

Abstract Effect of intermittent calorie restriction (ICR) on cancer is controversial. We then examined the effect of ICR and food contents on cancer using mouse model. CT26 mouse colon cancer cells were inoculated into the back of syngeneic BALB/c mouse. A 24 hours-fasting was performed once a week for 4 weeks. A control diet and a high calorie diet were used for feeding. The body weight at week 4 of mice was not different among control diet (Group C), control diet+ICR (Group CI) and high fat diet+ICR (Group FI). The tumor weight, nodal metastasis and CD133-positive cancer stem cells (CSC) in the tumor were more pronounced in Group CI and FI than those in Group C and F. Blood CD133 mRNA levels after fasting breakage were increased in Group CI and FI. We have reported the prometastatic effect of trans fatty acids in colorectal cancer. Here effect of oral intake of trans fatty acids on tumor stem cells with ICR was examined using the same model. Mice fed with 10% elaidic acid diet with ICR- (Group E) or ICR+ (Group EI) were compared with Group C and CI. The tumor weight and tumor MIB1 index was Group EI, Group E, Group CI and Group C in high order. In Group EI, nucleostemin (NS)-positive tumor cells were transiently increased on the next day of ICR. During 12 ICR cycle, NS-positive CSCs were gradually increased in Group EI. These findings suggest that ICR might enhance cancer stem cell-activating factors. Citation Format: Yi Luo, Yasuhiko Kitadai, Yoshitomo Chihara, Rina Fujiwara, Kiyohide Fujimoto, Hiroki Kuniyasu. Effect of intermittent calorie restriction on cancer stem cells. [abstract]. In: Proceedings of the 104th Annual Meeting of the American Association for Cancer Research; 2013 Apr 6-10; Washington, DC. Philadelphia (PA): AACR; Cancer Res 2013;73(8 Suppl):Abstract nr 1873. doi:10.1158/1538-7445.AM2013-1873