Abstract P4-07-11: MicroRNA-367a promotes tumor growth and stemness potential by targeting FBXW7 in breast cancer

Increasing studies showed that MicroRNAs (miRNAs)participate in the carcinogenesis and progression of breast cancer, but the specific mechanism of miRNAs in breast cancer needs to be furtherexplored. in this study, wefound that miR-367a was significantly up-regulated in breast cancer tissue samples and cell lines, compared to paired normal tumor-adjacent samples and MCF-10A. meanwhile, Kaplan–Meier analysis demonstrated high miR-367a expression was evidently correlated with poor prognostic features of breast cancer. overexpression of miR-367a remarkably promoted proliferation, cell cycle,inhibited apoptosis ratios and stem-like capacity of breast cancer cells in vitro, whilesilencing the expression of miR-367a dramaticallyreversed these cellular events .in addition,In vivo studies showed that knockdown of miR-367a inhibited tumor growth of breast cancer ,moreover, F-box and WD repeat domain-containing 7 (FBXW7) was identified as a direct target genes of miR-367a, as miR-367a directly bound to the 3'untranslated region of FBXW7 . Notably, alterations of FBXW7 levels abrogated the effects of miR-367a on breast cancer cell proliferation, cell cycle, apoptosis and stemness potential. In conclusion,evidence from this study demonstrated that miR-367amay serve as a novel prognostic indicator for breast cancer patients andexerts tumor promotion,at least in part, by inhibiting FBXW7.

Key words: miR-367a, FBXW7, breast cancer, tumor growth, stem-like capacity.

Citation Format: Xiao G, Zhang J, Sun X, Qin S, Zhang B, Liu D, Liu J, Ren H. MicroRNA-367a promotes tumor growth and stemness potential by targeting FBXW7 in breast cancer [abstract]. In: Proceedings of the 2016 San Antonio Breast Cancer Symposium; 2016 Dec 6-10; San Antonio, TX. Philadelphia (PA): AACR; Cancer Res 2017;77(4 Suppl):Abstract nr P4-07-11.

Influence of dietary rapeseed meal levels on growth performance, organ health and standardized ileal amino acid digestibility in meat ducks from 15 to 35 days of age

This study was conducted to investigate the effects of dietary rapeseed meal (RSM) inclusion levels on growth performance, organ health and standardized ileal amino acid digestibility (SIAAD) in meat ducks from 15 to 35 days of age. Six hundred and eighty 15-days-old ducks were randomly allotted to five treatments based on body weight. Five isonitrogenous and isoenergetic diets were formulated on a digestible amino acid basis by replacing 0% (the control), 25%, 50%, 75% and 100% (based on fresh) of protein from soya bean meal (SBM) with protein from RSM. The corresponding levels of RSM in experimental diets were 0%, 6.66%, 13.32%, 19.98% and 26.64% respectively. With increasing dietary RSM levels, body weight (BW) and average daily gain (ADG) linearly decreased (p < 0.001), whereas feed-to-gain ratio (F: G) linearly increased (p = 0.0078). Ducks fed the diets with 13.32% or more RSM had significantly lower (p < 0.05) BW, ADG and ADFI, or higher F: G than ducks fed the control diet. The maximum limit of dietary RSM supplementation was estimated to range from 4.27% to maximize ADG for 15 to 35 days to 11.69% to maintain feed intake for 15 to 35 days on the basis of a broken-line model. At day35, the 4th primary wing feather length and SIAAD (except for Met, Thr and Val) linearly decreased (p < 0.001), and the thyroid glands weight (% of BW) linearly increased (p < 0.05) with increasing dietary RSM levels. Ducks fed the RSM inclusion diets had significantly lower (p < 0.0001) serum aspartate aminotransferase (AST) and alanine transaminase (ALT) activities than ducks fed the control diet. These results suggested that the maximum limit of dietary RSM containing 7.57 μmol/g glucosinolates was estimated to be 4.27% to avoid growth reduction.