Açaí (Euterpe oleracea Martius) supplementation in the diet during gestation and lactation attenuates liver steatosis in dams and protects offspring.

PURPOSE: Maternal high-fat diet affects offspring and can induce metabolic disorders such as non-alcoholic fatty liver disease (NAFLD). New therapeutic strategies are being investigated as way to prevent or attenuate this condition. The objective of this study was to evaluate the effect of açaí supplementation in the maternal high-fat diet on dams and offspring lipid metabolism. METHODS: Female Fisher rats were divided in four groups and fed a control diet (C), a high-fat diet (HF), an açaí supplemented diet (CA) and a high-fat diet supplemented with açaí (HFA) 2 weeks before mating, during gestation and lactation. The effects of açaí were evaluated in the male offspring after birth (P1) and weaning (P21). RESULTS: HFA reduced relative liver weight, fat and cholesterol liver content in dams and improved liver steatosis as confirmed by histological analyses. HFA increased serum cholesterol and expression of Srebpf1 and Fasn genes. In offspring, HFA decreased relative liver weight, and serum cholesterol only in P21. An increase in the Sirt1, Srebpf1 and Fasn genes expression was observed in P21. CONCLUSIONS: These results suggest that açaí supplementation may attenuate NAFLD in dams and protect offspring from the detrimental effects of lipid excess from a maternal high-fat diet.

Physical activity is associated with malignant and benign breast diseases in low-income Brazilian women.

We compared the relationships among percentage of body fat (%BF) and physical activity with breast cancer (BC) and benign breast diseases (BBD) in low-income Brazilian women. A case-control study including 106 incident BC cases, 178 incident BBD cases, and 181 control women recruited from a public hospital-based screening center was conducted. Logistic regression models showed that sedentary women have a higher odds of developing BC in the age adjusted model [odds ratio (OR) = 2.39, 95% confidence interval (CI) 1.43-3.99]. After adjusting for hormonal-related risk factors and family history of breast cancer (OR = 2.94, 95% CI 1.50-5.79) and also for the % BF (OR = 2.71, 95% CI 1.36-5.37) the odds remained high. Independent of the adjustments made, %BF did not affect the odds for developing BC. When the same models were tested for women with BBD, we found a significant association with sedentary lifestyle in all models tested, with an OR = 3.03 (95% CI 1.69-5.42) in the fully adjusted model. In the same way, in the fully adjusted model %BF was significantly associated to risk for BBD (OR = 0.54, 95% CI 0.30-0.98). Similar to results found in other populations, our data suggest that physical activity is an important, independent protective factor for the risk of developing BC and BBD in low-income women from an admixed population.

Açaí (Euterpe oleracea Martius) supplementation improves oxidative stress biomarkers in liver tissue of dams fed a high-fat diet and increases antioxidant enzymes' gene expression in offspring.

Lipids excess from an uterine environment can increase free radicals production of and thus induce oxidative status imbalance, a key factor for progression of non-alcoholic fatty liver disease (NAFLD) in offspring. Food antioxidant components in maternal diet may play an important role in preventing offspring metabolic disorders. The objective of the study was to evaluate the effects of açaí pulp supplementation on maternal high-fat diet, by assessing activity and expression of antioxidant enzymes and biomarkers of oxidative stress in the liver. Female Fisher rats were divided into four groups and fed a control diet (C), a high-fat diet (HF), a control diet supplemented with açaí (CA) and a high-fat diet supplemented with açaí (HFA) before mating, during gestation and lactation. The effects of açaí supplementation on oxidative stress biomarkers and antioxidant enzymes expression were evaluated in dams and male offspring after weaning. HFA diet increased body weight in dams, however reduced absolute and relative liver weight. There was a reduction in liver biomarkers of oxidative stress, malondialdehyde and carbonyl protein, as well as in catalase, glutathione peroxidase and superoxide dismutase activity. In offspring, HFA diet reduced liver weight and increased Gpx1, Gpx4 and Sod1 mRNA expression. These results suggest that açaí is able to restore redox status, preventing oxidative damage in dams by a direct mechanism and to promote beneficial effects on expression of antioxidant defences related genes in offspring.

HMGCR gene polymorphism is associated with stroke risk in the EPIC-Norfolk study.

BACKGROUND: Earlier, a G/T single nucleotide polymorphism (SNP) in the HMGCR gene was shown to significantly reduce the overall serum lipids response to pravastatin. This study aimed to investigate the relationship of the rs17238540 SNP with coronary heart disease, stroke and cardiovascular disease risk. DESIGN: Cross-sectional study from the European Prospective Investigation into Cancer and Nutrition-Norfolk cohort. METHODS: Genotype was determined by pyrosequencing 23,011 participants, for whom clinical and biochemical data were available. Baseline risk factors according to genotype were evaluated, and the risk for fatal and nonfatal stroke, ischaemic heart disease and all types of cardiovascular diseases were assessed by logistic regression after approximately 11 years of follow-up. RESULTS: The G allele carriers presented 1.4 mmHg higher systolic blood pressure and 0.8 mmHg higher diastolic blood pressure than those who were TT carriers. They also presented higher risk of prevalent total (odds ratio: 1.44, 95% confidence interval: 1.05-1.97, P = 0.025) and nonfatal (odds ratio: 1.56, 95% confidence interval: 1.12-2.17, P = 0.009) stroke events compared with the TT individuals in the multivariate models. CONCLUSION: An association between the rs17238540 SNP and stroke risk was observed, independent of the effect of the SNP on the blood pressure. The possible mechanisms involved, besides the effect on blood pressure, might be related to pleiotropic functions of the HMGCR, and remain to be explored.

A single nucleotide polymorphism in the 3-hydroxy-3-methylglutaryl-coenzyme A reductase gene ( HMGCR) influences the serum triacylglycerol relationship with dietary fat and fibre in the European Prospective Investigation into Cancer and Nutrition in Norfolk (EPIC-Norfolk) study.

The objective of the present study was to investigate the influence of the single nucleotide polymorphism (rs17238540) at the 3-hydroxy-3-methylglutaryl-coenzyme A reductase gene (HMGCR) on the relationship between serum lipids and dietary fat and fibre (NSP). FFQ and pyrosequencing were used to assess cross-sectional dietary intake and HMGCR genotype in a population study with data for serum lipids available. Genotype frequencies and allele distributions for 23 011 participants were: TT 95.65 %, TG 4.29 % and GG 0.06 %; T 97.8 % and G 2.2 %. In regression analyses, the TG+GG group showed a significant positive relationship between TAG and SFA intake (+0.11 (95 % CI 0.02, 0.20) mmol TAG/l; P = 0.017; per 3 % SFA energy increase) while the TT individuals showed no change in the TAG levels related to SFA intake ( - 0.0007 (95 % CI - 0.02, 0.02) mmol TAG/l; P = 0.99). TG+GG individuals showed an inverse relationship between TAG and fibre intake higher ( - 0.14 (95 % CI - 0.22, - 0.05) mmol TAG/l than the TT group ( - 0.04 (95 % CI - 0.06, - 0.02) mmol TAG/l). In both cases the respective coefficient regressions of TAG were different between the genotype groups (Z = 2.27, P = 0.023 for SFA intake; Z = 2.19, P = 0.029 for fibre intake). Individuals carrying the G allele may show a greater response in lower TAG levels with reduced SFA intake and increased fibre intake compared with those homozygous for the T allele. The effectiveness of different dietary interventions to control serum lipids may vary according to HMGCR genotype.

Cardiovascular risk factors in children and adolescents living in an urban area of Southeast of Brazil: Ouro Preto Study.

This study aims to identify risk factors for cardiovascular disorders in schoolchildren living in Ouro Preto City, Brazil. A cross-sectional study was carried out in a population-based sampling of schoolchildren (6-14 years old), randomly selected and stratified by the proportion of students according to age and gender in each schools of the city. Biochemical, clinical and anthropometric variables as well as physical activity and family history were used in a logistic regression model for obesity or arterial hypertension. Out of 780 schoolchildren sampled, the risk of obesity was greater in subjects presenting high triglyceride and low high density lipoprotein-cholesterol levels, and those whose parents were obese, while the risk of hypertension was high in obese subjects and those who presented low birth weight. It was observed that 44.4% of the schoolchildren were exposed to two or three cardiovascular disease (CVD) risk factors and 8.2% were exposed to four or six factors. These findings should be considered in preventive measures to reduce the future risk for CVD among schoolchildren in Brazil.

Bracken fern-induced malignant tumors in rats: absence of mutations in p53, H-ras and K-ras and no microsatellite instability.

Bracken fern (genus Pteridium) has been shown to induce tumors in domestic and experimental animals. Epidemiological studies have also shown an association between human exposure to bracken toxins and increased risk for the development of upper gastrointestinal tract tumors. Our aim in this study was to investigate possible genomic alterations in bracken fern-induced tumors of experimental animals searching for molecular markers that might be used for human epidemiological studies. Using human colorectal carcinogenesis as a molecular model, we examined eight malignant bracken fern-induced tumors of rats for mutations in the genes associated with the "classic pathway" of colorectal cancer, i.e. p53 and ras, and also in the "mutator pathway" by evaluating microsatellite instability. Exons 5-9 of the p53 gene and exons 1 and 2 of the K-ras and H-ras genes were examined by DNA sequencing and no mutations were found in any of the eight tumors. Amplification of five previously validated microsatellite loci (one with mono-, three with di- and one with tetra-nucleotide repeat motifs) in the malignant tumors and in the surrounding normal tissue did not reveal any instability. The involvement of epigenetic alterations or of mutations in other tumor suppressor genes or oncogenes should be further investigated in the search for human epidemiological markers.

Spotted fever group Rickettsia in small rodents from areas of low endemicity for Brazilian spotted fever in the eastern region of Minas Gerais State, Brazil.

We investigated the humoral immune response against different species of Rickettsia in serum samples from small rodents collected in two areas of a silent focus for Brazilian spotted fever in the eastern region of Minas Gerais State, Brazil. Sera samples were analyzed by indirect immunofluorescence assay using antigens from Rickettsia species of the spotted fever, ancestral, and transition groups. Titers ≥ 1:64 were considered positive. In Santa Cruz do Escalvado, 94% (30 of 32) of the samples collected from Rattus rattus, 22% (5 of 23) from Nectomys squamipes, and 80% (4 of 5) from Akodon sp., reacted by indirect immunofluorescence assay with Rickettsia antigens of the spotted fever group. In the municipality of Pingo D'Água, 84% (26 of 31) of the samples collected from R. rattus, 86% (6 of 7) of the samples from Oryzomys subflavus, 86% (6 of 7) from N. squamipes, and 100% (1 of 1) from Bolomys sp. contained antibodies that reacted with rickettsial antigens of the spotted fever group. These results demonstrated the previous exposure of small rodents to spotted fever group Rickettsia, suggesting the participation of these animals in the natural history of these rickettsiae in this region.

Rickettsia in synanthropic and domestic animals and their hosts from two areas of low endemicity for Brazilian spotted fever in the eastern region of Minas Gerais, Brazil.

The aim of this study was to understand the current epidemiology of rickettsial diseases in two rickettsial-endemic regions in Brazil. In the municipalities of Pingo D'Agua and Santa Cruz do Escalvado, among serum samples obtained from horses and dogs, reactivity by immunofluorescent assay against spotted fever group rickettsiae was verified. In some serum samples from opossums (Didelphis aurita) captured in Santa Cruz do Escalvado, serologic response against rickettsiae was also verified. Polymerase chain reaction identified rickettsiae only in ticks and fleas obtained in Santa Cruz do Escalvado. Rickettsiae in samples had 100% sequence homology with Rickettsia felis. These results highlight the importance of marsupials in maintenance of the sylvatic cycle of rickettsial disease and potential integration with the domestic cycle. Our data also support the importance of horses and dogs as sentinels in monitoring circulation of rickettsiae in an urban area.

A HMGCR polymorphism is associated with relations between blood pressure and urinary sodium and potassium ratio in the Epic-Norfolk Study.

A polymorphism in the HMGCR gene (rs17238540) was related to a lower response to pravastatin treatment and we aimed to investigate whether an interaction is present for this polymorphism on blood pressure (BP) and salt intake. Cross-sectional urinary sodium and potassium concentration and the polymorphism were assessed in a large population study. Participants with the mutated allele (G) had significantly higher BP than homozygous TT. There were highly significant positive trends between BP and urinary sodium:potassium ratio across quartiles in men, with less effect in women, especially women carrying the mutated allele, G. Multivariate regression showed a significant positive association between BP and the urinary sodium: potassium ratio that differed in men and women according to genotype. In men carrying the G allele, the regression slopes for diastolic BP and systolic BP were higher than in men TT and the opposite was observed in women. Our results suggest that the SNP rs17238540 in the HMGCR is associated with the BP response to urinary sodium: potassium ratio, the magnitude of the association differing according to possession of the G allele.