Vitamin A Decreases Cytotoxicity of Oxidized Low-Density Lipoprotein in Patients with Atherosclerosis.

BACKGROUND: Oxidized low-density lipoprotein (ox-LDL) is implicated in initiation and progression of atherosclerosis. Previously, we found that ox-LDL increases vulnerability of peripheral blood mononuclear cells (PBMCs) in atherosclerotic patients compared to controls. Vitamin A induces proliferation of PBMCs. The aim of this study was to determine the effect of vitamin A supplementation on PBMC survival against LDL and different doses of ox-LDL. METHOD: In this double-blind placebo-controlled trial, we recruited 35 atherosclerotic patients and 38 healthy controls and randomly allocated them into placebo and vitamin A groups, which received either placebo or 25,000 IU/day of vitamin A for 3 months. PBMCs were isolated, cultured, and stimulated by 1 µg/mL LDL as well as 1 µg/mL and 50 µg/mL ox-LDL. The stimulation indexes (SIs) of PBMCs were calculated to identify cell viability. Additionally, the circulating ox-LDL levels were measured by ELISA. RESULTS: Viability of PBMCs stimulated by 50 µg/mL ox-LDL significantly increased following vitamin A supplementation in patients (p < 0.01). The levels of circulating ox-LDL were not changed by vitamin A treatment. Ox-LDL levels were strongly and positively correlated to SI of PBMCs stimulated by 1 µg/mL LDL and1 µg/mL ox-LDL in all groups. CONCLUSION: Vitamin A decreases cytotoxicity of high-dose ox-LDL and improves PBMC viability. The protective effect of vitamin A is not mediated by an antioxidative mechanism, but may instead have been due to intracellular protection of the apoptotic machinery or induction of proliferation of the cells. Higher levels of ox-LDL increase PBMC irritability in all participants.

Relationship between dietary diversity score and general health in female students.

BACKGROUND: Adolescence is a critical period with respect to mental and psychological issues. The role of nutrients is well known in health condition in adolescents, but little emphasis is placed on total diet quality. Dietary diversity score (DDS) is often used to assess diet quality. The objective of this study was to investigate the relationship between DDS and general health in girl students. METHODS: The present research is a cross-sectional study which used descriptive-analytical approach. A total of 384 high-school female students selected using proportional stratified sampling. Physical activity level, diet and general health information collected using International Physical Activity Questionnaire (IPAQ), Dietary Diversity Questionnaire (FAO-2013) and 28-item self-reported general health questionnaire (GHQ-28), respectively. In addition, weight, height and waist circumference (WC) measured. Data analyzed using Chi-Square test, one-way ANOVA and Multinomial Logistic Regression. RESULTS: Mean DDS was 4.43±1.09. After adjustment for confounders of age, body mass index, physical activity, socioeconomic status and nutritional supplement intake, students with higher DDS were less prone to general health disorders (P≤0.05). CONCLUSIONS: These finding implicate higher DDS in adolescents may associate with better general health.

Does Resveratrol Improve Insulin Signalling in HepG2 Cells?

OBJECTIVES: Diabetes mellitus is a common metabolic disorder with high global prevalence. It is characterized by a decrease in insulin secretion or a decrease in insulin sensitivity or both. The aim of the present study was to investigate the effects of resveratrol treatment on the expression of the genes involved in insulin signalling cascade, such as Forkhead box protein O1 (FoxO1), 3-phosphoinositide-dependent protein kinase 1 (PDPK1) and mammalian target of rapamycin (mTOR). METHODS: HepG2 cells were cultured in serum-free medium with high concentrations of glucose and insulin and then were treated with resveratrol (5, 10 and 20 µM) for 24 and 48 hours. Complementary deoxyribonucleic acids (cDNAs) were synthesized followed by RNA extraction. Real-time quantitative reverse transcription polymerase chain reaction was used to analyze the expression of FoxO1, PDPK1 and mTOR. RESULTS: Resveratrol increased the expression of PDPK1, mTOR and FoxO1. No significant difference was seen among differing dosages of resveratrol, but treatments for 48 hours exerted the greatest effectiveness. CONCLUSIONS: Our results were consistent with other studies showing the beneficial effects of resveratrol on diabetes. However, considering the effects of resveratrol in increasing FoxO1 and gluconeogenic gene expression, long-term usage of resveratrol should be investigated in greater depth in future studies.

Comparison of Serum LP-PLA2 Level and some Nutritional Factors between Well-Controlled and Poorly-Controlled Diabetic Patients.

Lipoprotein-associated phospholipase A2 (Lp-PLA2) is produced by inflammatory cells, bound to LDL and other lipoproteins, and hydrolyzes oxidized phospholipids in LDL. Type 2 diabetes is the most common form of diabetes some investigations show the association of lipoprotein-associated phospholipase A2 mass and activity with the incidence of cardiovascular disease (CVD) in populations with high prevalences of insulin resistance and diabetes. This study is a cross-sectional descriptive and analytic study on 80 individuals with diabetes referring to the Tehran Diabetes Association. Patients divided into two groups (well-controlled and poorly controlled) based on their HbA1C. Personal information, anthropometric assessments (including height, weight, waist circumference and hip circumference) and semi-quantitative 147 items FFQ was used and vein blood samples were taken. After plasma separation, blood sample used for FBS, HbA1c and LP-PLA2 measurement. The independent sample T test was used for comparing means. Data analyses showed a significant difference between weight and WHR (waist to hip ratio) means in two studied groups, also there was a statistically significant difference in food intake (Energy, carbohydrate, protein, micronutrients percent and some of the micronutrients). FBS, HbA1C and LP-PLA2 means showed statistically significant difference (P<0/001) between two groups. This study showed LP-PLA2 is elevated in poorly-controlled patients compared to well-controlled diabetic patients, which may suggest some nutritional factors contributing to the regulation of this enzyme.