Objectives: The study was conducted to assess whole-grain intake pattern and factors influencing intake among Malaysian medical students.
Methods: A cross-sectional study investigating whole-grain intake among 151 medical students in a private medical university in Malaysia was conducted from January to June 2018. A self-administered questionnaire was used to assess sociodemographic variables, the whole-grain intake pattern and the knowledge and attitudes toward whole-grain intake. Data were analyzed using IBM SPSS software. Chi-square test and multivariable logistic regression were used.
Results: The prevalence of reported whole-grain intake in the past 3 months was 51%. Chinese ethnicity, readiness to adhere to Malaysian food pyramid, and self-preparation of food, and eating at home were significantly associated with whole-grain consumption. However, the primary determinants of food choice such as education, knowledge, and affordability did not seem to influence whole-grain consumption. Whole-grain consumption is relatively low among Malaysian medical students. Cultural background and self-belief influence this practice despite being from the medical fraternity.
Conclusions: Efforts are needed to bridge the knowledge-practice gap by assessing the barriers to whole-grain consumption to design effective initiatives to promote an increase in whole-grain consumption.
METHODS: The tricistronic expression construct that encodes MOAP-1, Bax, and RASSF1A (MBR) or its mutant, MOAP-1∆BH3L, Bax and RASSF1A (MBRX) was expressed from an IRES (Internal Ribosome Entry Site)-based tricistronic expression vector in human breast cancer cells, including MCF-7, MCF-7-CR (cisplatin resistant) and triple negative breast cancer cells, BMET05, for functional characterization through in vitro and in vivo models.
RESULTS: Transient expression of MBR potently promoted dose-dependent apoptotic signaling and chemo-sensitization in the cancer cells, as evidenced by loss of cell viability, nuclei condensation and Annexin-V positive staining while stable expression of MBR in MCF-7 cells significantly reduced the number of MBR stable clone by 86% and the stable clone exhibited robust chemo-drug sensitivity. In contrast, MBRX stable clone exhibited chemo-drug resistance while transiently over-expressed MOAP-1ΔBH3L inhibited the apoptotic activity of MBR. Moreover, the spheroids derived from the MBR stable clone displayed enhanced chemo-sensitivity and apoptotic activity. In mouse xenograft model, the tumors derived from MBR stable clone showed relatively high level of tumor growth retardation associated with the increase in apoptotic activity, leading to the decreases in both tumor weight and volume.
CONCLUSIONS: Expression of MBR in cancer cells induces apoptotic cell death with enhanced chemo-sensitization requiring the BH3L domain of MOAP-1. In animal model, the expression of MBR significantly reduces the growth of tumors, suggesting that MBR is a potent apoptotic sensitizer with potential therapeutic benefits for cancer treatment.