RESUMO
Olive oil (OO) is the most representative food of the traditional Mediterranean Diet (MedDiet). Increasing evidence suggests that monounsaturated fatty acids (MUFA) as a nutrient, OO as a food, and the MedDiet as a food pattern are associated with a decreased risk of cardiovascular disease, obesity, metabolic syndrome, type 2 diabetes and hypertension. A MedDiet rich in OO and OO per se has been shown to improve cardiovascular risk factors, such as lipid profiles, blood pressure, postprandial hyperlipidemia, endothelial dysfunction, oxidative stress, and antithrombotic profiles. Some of these beneficial effects can be attributed to the OO minor components. Therefore, the definition of the MedDiet should include OO. Phenolic compounds in OO have shown antioxidant and anti-inflammatory properties, prevent lipoperoxidation, induce favorable changes of lipid profile, improve endothelial function, and disclose antithrombotic properties. Observational studies from Mediterranean cohorts have suggested that dietary MUFA may be protective against age-related cognitive decline and Alzheimer's disease. Recent studies consistently support the concept that the OO-rich MedDiet is compatible with healthier aging and increased longevity. In countries where the population adheres to the MedDiet, such as Spain, Greece and Italy, and OO is the principal source of fat, rates of cancer incidence are lower than in northern European countries. Experimental and human cellular studies have provided new evidence on the potential protective effect of OO on cancer. Furthermore, results of case-control and cohort studies suggest that MUFA intake including OO is associated with a reduction in cancer risk (mainly breast, colorectal and prostate cancers).
Assuntos
Dieta Mediterrânea , Saúde , Óleos de Plantas , Envelhecimento/psicologia , Doenças Cardiovasculares/epidemiologia , Doença Crônica , Cognição/fisiologia , Consenso , Diabetes Mellitus/epidemiologia , Expectativa de Vida , Síndrome Metabólica/epidemiologia , Neoplasias/epidemiologia , Obesidade/epidemiologia , Azeite de Oliva , Óleos de Plantas/química , Medição de Risco , Fatores de RiscoRESUMO
BACKGROUND: Cholesterol ester transfer protein (CETP) mediates the transfer of cholesteryl esters from HDL to apolipoprotein (apo) B-containing lipoproteins. The possible atherogenic role of this protein is controversial. Diet may influence plasma CETP concentrations. OBJECTIVE: The objective was to determine whether the changes in plasma lipids observed after consumption of 2 lipid-lowering diets are associated with changes in plasma CETP concentrations. DESIGN: : We studied 41 healthy, normolipidemic men over 3 consecutive 4-wk dietary periods: a saturated fatty acid-rich diet (SFA diet: 38% fat, 20% saturated fat), a National Cholesterol Education Program Step I diet (NCEP Step I diet: 28% fat, 10% saturated fat), and a monounsaturated fatty acid-rich diet (MUFA diet: 38% fat, 22% monounsaturated fat). Cholesterol content (27.5 mg/MJ) was kept constant during the 3 periods. Plasma concentrations of total, LDL, and HDL cholesterol; triacylglycerol; apo A-I and B; and CETP were measured at the end of each dietary period. RESULTS: Compared with the SFA diet, both lipid-lowering diets significantly decreased plasma total and LDL cholesterol, apo B, and CETP. Only the NCEP Step I diet lowered plasma HDL cholesterol. Positive, significant correlations were found between plasma CETP and total (r = 0.3868, P < 0.0001) and LDL (r = 0.4454, P < 0.0001) cholesterol and also between changes in CETP concentrations and those of total (r = 0.4543, P < 0.0001) and LDL (r = 0.4554, P < 0.0001) cholesterol. CONCLUSIONS: The isoenergetic substitution of a high-saturated fatty acid diet with an NCEP Step I or a high-monounsaturated fatty acid diet decreases plasma CETP concentrations.
Assuntos
Proteínas de Transporte/sangue , Ésteres do Colesterol/metabolismo , Dieta com Restrição de Gorduras , Gorduras Insaturadas na Dieta/administração & dosagem , Ácidos Graxos Monoinsaturados/administração & dosagem , Glicoproteínas , Adulto , Análise de Variância , Proteínas de Transferência de Ésteres de Colesterol , HDL-Colesterol/sangue , LDL-Colesterol/sangue , Humanos , Masculino , Valores de Referência , Triglicerídeos/sangueRESUMO
The effects on plasma lipid concentrations of two oleic acid-rich diets, prepared with two different plant oils--olive oil and sunflower oil high in monounsaturated fatty acids (MUFAs)-- were compared with a National Cholesterol Education Program (NCEP) I diet. Twenty-one healthy, normolipidemic, young males consumed an NCEP-I diet (30% of energy as fat) during a 25-d period. Subjects were then assigned to two 4-wk study periods, according to a randomized, crossover design. Group one was placed on an olive oil-enriched diet (40% fat, 22% MUFAs), followed by a 4-wk period of a sunflower oil-enriched diet (40% fat, 22% MUFAs). In group two, the order of the diets was reversed. Both MUFA dietary periods resulted in an increase in high-density-lipoprotein (HDL) cholesterol (7% for the olive oil diet and 4% for the sunflower oil diet) and in apolipoprotein (apo) A-I (9% for both) compared with the NCEP-I diet. Low-density-lipoprotein (LDL) cholesterol and apo B concentrations (x +/- SEM) were lower (P < 0.05) during the sunflower oil diet (2.40 +/- 0.11 mmol/L, 0.85 +/- 0.04 mg/L) than during the olive oil diet (2.64 +/- 0.15 mmol/L, 0.93 +/- 0.05 mg/L). No significant differences were observed in these variables between the sunflower oil and NCEP-I (2.48 +/- 0.13 mmol/L, 0.89 +/- 0.04 mg/L) diets.(ABSTRACT TRUNCATED AT 250 WORDS)
Assuntos
Gorduras na Dieta/administração & dosagem , Lipoproteínas/sangue , Ácidos Oleicos/administração & dosagem , Óleos de Plantas , Adulto , Colesterol/sangue , Estudos Cross-Over , Ácidos Graxos Monoinsaturados/administração & dosagem , Ácidos Graxos Insaturados/administração & dosagem , Humanos , Lipídeos/sangue , Masculino , Ácidos Oleicos/farmacologia , Azeite de Oliva , Óleo de GirassolRESUMO
The plasma lipid response to changes in dietary fat and cholesterol can vary between individuals. The SstI polymorphism, arising from a cytosine to guanosine substitution in the 3' untranslated region of the APOC3 gene distinguishes between two alleles--S1 and S2. The S2 allele has been associated with elevated plasma triacylglycerol, cholesterol, and apolipoprotein (apo) C-III concentrations. In 90 young men we examined the effect of the same mutation on the response of low-density-lipoprotein (LDL) cholesterol to dietary monounsaturated fat. The frequency for the S2 allele was 0.14. Subjects were fed a low-fat diet for 25 d, followed by a diet rich in monounsaturated fatty acid (22% MUFA, 38% total fat) for 28 d; lipoproteins were measured at the end of each diet. There were no significant differences in initial total cholesterol between subjects with the APOC3*S1/APOC3*S1 (S1/S1) and APOC3*S1/APOC3*S2 (S1/S2) genotypes. After consumption of the diet high in MUFA, significant increases in LDL cholesterol (0.13 mmol/L, P < 0.027) were noted in the S1/S1 subjects whereas a significant decrease was observed in the S1/S2 subjects (-0.18 mmol/L, P < 0.046). Significant genotypic effects were seen for diet-induced changes in LDL cholesterol (P < 0.00034), total cholesterol (P < 0.009), and apo B (P < 0.0014). A study of the effect of the interaction between this mutation with that present in position -76 of the APOA1 gene promoter region (G/A) revealed that both mutations had an additive effect on changes in total cholesterol, LDL cholesterol, and apo B induced by diets. Plasma LDL-cholesterol responsiveness to the diet may be explained, at least in part, by variation at the APOC3 gene locus.
Assuntos
Apolipoproteínas C/genética , LDL-Colesterol/sangue , Gorduras na Dieta/metabolismo , Adulto , Alelos , Apolipoproteína A-I/sangue , Apolipoproteína C-III , Gorduras na Dieta/administração & dosagem , Amplificação de Genes , Genótipo , Humanos , Masculino , Polimorfismo GenéticoRESUMO
The S2 allele of the SstI polymorphism of the apolipoprotein (apo) C-III gene has been associated with elevated triacylglycerol concentrations, high blood pressure, and increased risk of coronary artery disease, all of which are characteristic of an insulin-resistant state. To study the effect of this mutation on carbohydrate metabolism in healthy persons, we gave 41 male subjects 3 consecutive diets. The first was rich in saturated fat [15% protein, 47% carbohydrate, 38% fat (20% saturated)], the second was a National Cholesterol Education Program Step 1 diet [15% protein, 57% carbohydrate, 28% fat (< 10% saturated)], and the last was rich in monounsaturated fat [15% protein, 47% carbohydrate, 38% fat (22% monounsaturated, < 10% saturated)]. At the end of each dietary period, subjects received an oral-glucose-tolerance test (OGTT). Apo C-III genotype significantly affected basal glucose concentrations (P < 0.045) and insulin concentrations after the OGTT (P < 0.012). APOC3*S1/APOC3*S2 subjects (n = 13) had higher insulin concentrations after the OGTT than APOC3*S1/APOC3*S1 subjects (n = 28) in the 3 periods (diet 1: P < 0.0004; diet 2: P < 0.01; diet 3: P < 0.008). Multiple regression analysis showed that this polymorphism predicted the insulin response to the OGTT (P < 0.031) and the difference between basal insulin concentrations and insulin concentrations after the OGTT (P < 0.002) with the saturated fat diet. In summary, our results suggest that the mutation in the apo C-III gene affects insulin response to an OGTT, which could result in reduced sensitivity to insulin, especially when persons consume diets rich in saturated fat.
Assuntos
Apolipoproteínas C/genética , Metabolismo dos Carboidratos , Gorduras na Dieta/administração & dosagem , Insulina/farmacologia , Polimorfismo Genético , Administração Oral , Adulto , Apolipoproteína C-III , Índice de Massa Corporal , Teste de Tolerância a Glucose , Humanos , MasculinoRESUMO
BACKGROUND: The fatty acid composition of the diet can modulate the effect of dietary cholesterol on plasma lipoproteins. However, HDL composition and its capacity to promote cholesterol efflux can be influenced by the diet. OBJECTIVE: Modifications in plasma lipids and in the capacity of serum to stimulate the cholesterol efflux induced by a low-fat diet [National Cholesterol Education Program (NCEP) Step I diet], by a monounsaturated fatty acid (MUFA)-rich diet, and by addition of cholesterol to both diets was studied. DESIGN: Fifteen young, healthy men followed 2 NCEP Step I diets (<30% of fat as energy, with <10% saturated fat and 14% MUFAs) for 24 d, providing 0.027 or 0.068 mg cholesterol x kJ(-1) x d(-1), and 2 oleic acid-enriched diets (38% of energy as fat, with 24% MUFAs) providing the same amount of dietary cholesterol as the NCEP Step I diets. RESULTS: Total cholesterol, LDL cholesterol, apolipoprotein (apo) B, and apo A-I concentrations decreased after the NCEP Step I and MUFA diets compared with the usual diet. HDL cholesterol also decreased after the NCEP Step I diet. Total:HDL cholesterol, apo B, and apo B:apo A-I were lower after the MUFA diets than after the NCEP Step I diets. There were no significant differences between the lipid profiles obtained after the NCEP Step I and MUFA diets were enriched with cholesterol. The capacity of serum to promote cholesterol efflux was significantly higher after the cholesterol-enriched NCEP Step I diet than after the NCEP Step I diet. CONCLUSIONS: The MUFA diet induced a better lipid profile than the NCEP Step I diet; however, the increase in the cholesterol content of both diets produced similar plasma lipid changes. The cholesterol in the NCEP Step I diet increased the cholesterol efflux induced by total serum.
Assuntos
Colesterol na Dieta/administração & dosagem , Colesterol/sangue , Ácidos Graxos Monoinsaturados/administração & dosagem , Lipoproteínas/sangue , Neoplasias Hepáticas Experimentais/metabolismo , Adulto , Animais , Colesterol/metabolismo , Colesterol na Dieta/farmacologia , Ingestão de Energia , Humanos , Masculino , Células Tumorais CultivadasRESUMO
BACKGROUND: For the most part, the benefits of monounsaturated-rich diets (MUFA-diet) have been related to their action on plasma lipid levels. However other non-lipidic effects could also be involved in their protective effects. One of these involves the decrease in plasma levels of plasminogen activator inhibitor type 1 (PAI-1), the main inhibitor of fibrinolysis. Given that the PAI-1 is of endothelial origin, one hypothesis is that the MUFA-diet could protect against CHD by modulating some endothelial components. METHODS AND RESULTS: Healthy male subjects (n = 25) received three different consecutive diets, each lasting 28 days: a low fat NCEP-I-diet, with 28% calories as fat, 10% saturated fat (SAT), 12% monounsaturated (MUFA) and 6% polyunsaturated (PUFA); a MUFA-diet, with 38% calories as fat, 10% SAT, 22% MUFA and 6% PUFA; and a SAT rich-diet (SAT-diet), with 38% calories as fat, 20% SAT, 12% MUFA and 6% PUFA. After each dietary period, the plasma lipid profile was determined, including total cholesterol, HDL cholesterol, LDL cholesterol, total triglyceride, apo A1, apo B plasma levels and conjugated diene formation, after incubation of LDL particles with Cu 5 microM/l. Endothelial products measured in plasma were von Willebrand factor (vWF), E-selectin, Thrombomodulin and Tissue Factor Pathway Inhibitor (TFPI) levels. We observed a decrease in vWF, PAI-1 and TFPI plasma levels and an increase in lag time of conjugated diene formation after the MUFA-diet. There was a positive correlation between the decreases in TFPI and vWF and the changes in total cholesterol, LDL-C, apo B plasma levels. The decrease in TFPI was negatively correlated with the increase in lag time of conjugated diene formation. PAI-1 plasma levels were positively correlated with total cholesterol, LDL-C and triglycerides and negatively correlated with HDL-C. CONCLUSIONS: Consumption of a Mediterranean-type MUFA-diet produces a decrease in plasma levels of vWF, TFPI and PAI-1 plasma levels in young healthy males. Given that these substances are of endothelial origin, one could suggest that the MUFA of the diet has a beneficial effect on endothelial function resulting in protective changes against thrombogenesis.
Assuntos
Gorduras Insaturadas na Dieta/administração & dosagem , Selectina E/sangue , Endotélio Vascular/fisiologia , Ácidos Graxos Monoinsaturados/administração & dosagem , Lipoproteínas/sangue , Trombomodulina/sangue , Fator de von Willebrand/metabolismo , Adulto , Apolipoproteína A-I/sangue , Apolipoproteínas B/sangue , HDL-Colesterol/sangue , LDL-Colesterol/sangue , Dieta com Restrição de Gorduras , Ingestão de Energia , Ensaio de Imunoadsorção Enzimática , Inibidores do Fator Xa , Humanos , Masculino , Inibidor 1 de Ativador de Plasminogênio/sangueRESUMO
We have studied the effect of cyclosporine on the exocrine pancreas of rats submitted to treatment with different parenteral doses (15, 30, 50 mg/kg/day) for different time periods (7 and 30 days). Serum amylase levels, pancreas weight, and total pancreatic amylase and protein content showed a dose-dependent decrease. Basal amylase secretion from isolated lobules remained unchanged. Furthermore, the pancreatic lobules from animals under cyclosporine treatment exhibited a decreased response to bethanechol stimulation. Our data suggest that cyclosporine produces a toxic effect on exocrine pancreatic function.
Assuntos
Amilases/metabolismo , Ciclosporinas/farmacologia , Pâncreas/fisiologia , Animais , Betanecol , Compostos de Betanecol/farmacologia , Peso Corporal/efeitos dos fármacos , Técnicas In Vitro , Cinética , Masculino , Tamanho do Órgão/efeitos dos fármacos , Pâncreas/efeitos dos fármacos , Proteínas/metabolismo , Ratos , Ratos Endogâmicos , Valores de ReferênciaRESUMO
This study evaluates the effect on high-density lipoprotein (HDL) binding activity in cultured granulocytes before and after metabolic control of non-insulin-dependent diabetes mellitus ([NIDDM] type 2 diabetes) patients. In 20 type 2 diabetic patients, diabetic control was accomplished by administration of oral antidiabetic agents and dietary restrictions. Adequate metabolic control was reflected by a decrease in the fasting glucose, glycosylated hemoglobin (HbA1c), mean insulin, and body mass index (BMI). After control of the diabetes, the mean HDL3 cholesterol was increased from 0.918 +/- 0.05 to 1.008 +/- 0.05 mmol/L (P < .05) and apolipoprotein AI (apo AI) was increased from 103 +/- 5.8 to 115 +/- 5.1 mg/dL (P < .01). The HDL3 maximum specific binding was higher after versus before diabetic control, 77 +/- 6 versus 122 +/- 8 ng/mg cell protein (P < .01). This increase was related to an increase in maximum binding ([Bmax] from 4.97 x 10(-10) to 8.3 x 10(-10) mol/L, P < .001), and no significant changes were observed in the Kd (from 1.47 x 10(-7) v 2.04 x 10(-7) mol/L). These results suggest that the metabolic control of type 2 diabetes increases HDL3 binding activity.
Assuntos
Glicemia/metabolismo , Proteínas de Transporte , Diabetes Mellitus Tipo 2/metabolismo , Granulócitos/metabolismo , Lipoproteínas HDL/sangue , Proteínas de Ligação a RNA , Adulto , Diabetes Mellitus Tipo 2/sangue , Feminino , Humanos , Radioisótopos do Iodo , Lipídeos/sangue , Lipoproteínas HDL3 , Masculino , Pessoa de Meia-Idade , Ligação Proteica , Receptores de Lipoproteínas/sangueRESUMO
BACKGROUND: A study of the effect of smokers' diets on their atherogenic lipidic profile. SUBJECTS AND METHODS: 41 healthy males (32 non-smokers and 9 smokers) consumed consecutively a diet low in fat and rich in carbohydrates (28% total fat content < 10% saturated fats, and 57% carbohydrates), and a diet rich in monounsaturated fatty acids (38% total fat content with 22% monounsaturated fats). At the end of each dietary period, adhesion was confirmed by quantification of LDL cholesterol esters, plasma lipids and insulin levels. RESULTS: There were no significant differences between the age or the body mass of the groups of smokers or non-smokers. After both diets tobacco was found to have a significant effect on triglyceride levels (p < 0.0007), HDLc (p < 0.007), apo A-I (p < 0.02) and the LDLc/HDLc ratio (p < 0.005), revealing an interaction between diet and both HDLc levels (p < 0.004) and LDLc/HDLc ratios (p < 0.003). With the low fat and high monounsaturated fatty acid content diets smokers presented higher triglyceride levels (both with p < 0.0002) and LDLc/HDLc ratios (p < 0.0002 and p < 0.05, respectively) and lower levels of apo A-I (p < 0.002 and p < 0.004, respectively). However, in smokers the HDLc levels were only reduced after the low fat diet (p < 0.0003) and after the diet with a high monounsaturated fat content there was a rise in HDLc levels (p < 0.02) and a drop in the LDLc/HDLc ratio (p < 0.005) compared to the group of non-smokers. There were no significant differences in the insulin levels between groups. CONCLUSION: The atherogenic lipidic profile of smokers is due to an effect of tobacco on the lipidic metabolism. This atherogenic profile is accentuated with a low fat diet rich in carbohydrates and can be rectified to some degree with a diet with a high monounsaturated fatty acid content.
Assuntos
Apolipoproteínas/sangue , Colesterol/sangue , Dieta , Fumar/sangue , Triglicerídeos/sangue , Adulto , Humanos , Masculino , Pessoa de Meia-IdadeRESUMO
OBJECTIVE: Two dietary regimens recommended for the reduction of coronary risk, by way of their effects on lipid profile, are the diet low in saturated fat and a diet rich in monounsaturated fats (MUFA). However the effects of these diets on carbohydrate metabolism in healthy subjects are not well known. The objective of this study was to compare the effect of both diets on various parameters of carbohydrate metabolism. METHODS: 41 healthy young males were submitted to 3 consecutive diets, each for a duration of 4 weeks. The first diet was rich in saturated fat (SAT) (38% fat, 20% saturated). The second was rich in carbohydrates following the recommendations of the NCEP-I (National Cholesterol Education Program type I) (28% fat, 47% carbohydrates). The last one was a diet rich in monounsaturated fatty acids (38% fat, 22% MUFA). At the end of each dietary period, blood pressure (BP) and blood levels of glucose, insulin and free fatty acids were determined. 29 subjects were also submitted to an oral glucose tolerance test (OGTT) at the end of each diet. RESULTS: The SAT diet induced the highest levels of insulin after the OGTT. The consumption of the MUFA diet determined the lowest levels of fasting blood glucose (-0.60 mmol/l [13%], p < 0.0002), insulin (-9 microUl/ml [47%], p < 0.0002) and free fatty acids (-0.11 mmol/l [24%], p = 0.006), compared to the NCEP-I diet. Systolic and diastolic blood pressure were higher in the NCEP-I diet than during the other periods (SBP: +6 mmHg compare with SAT [5%], p = 0.0001; and +5 mmHg compare with MUFA [4%], p = 0.0001; DBP: +20 mmHg compare with MUFA [27%], p = 0.0001) and +6 mmHg compared with SAT [8%], p = 0.0001). CONCLUSION: Of the diets most commonly used for the treatment and prevention of arteriosclerosis, a diet rich in monounsaturated fats is the most beneficial for the healthy population from the point of view of carbohydrate metabolism and blood pressure.
Assuntos
Pressão Sanguínea/fisiologia , Carboidratos/sangue , Gorduras Insaturadas na Dieta/administração & dosagem , Ácidos Graxos Monoinsaturados/administração & dosagem , Adulto , Análise de Variância , Arteriosclerose/prevenção & controle , Glicemia/análise , Gorduras Insaturadas na Dieta/sangue , Ácidos Graxos Monoinsaturados/sangue , Ácidos Graxos não Esterificados/sangue , Humanos , Insulina/sangue , Resistência à Insulina/fisiologia , Masculino , Valores de Referência , Fatores de TempoRESUMO
In patients treated with cyclosporine, an increase in the incidence of goiter has been demonstrated. This agent produces changes in the lipidic metabolisms, among which the increase in VLDL stands put. Given that the hyperlipemia more frequently associated to hyperuricemia is the increase of such lipoprotein, we decided to study the behaviour of plasmatic uric acid in patients receiving treatment with cyclosporine. The study was conducted in patients with bone marrow transplant undergoing immunosuppressive therapy, considering the effect of cyclosporine as the only drug or following a scheme of mixed immunosuppression associated to prednisone. We observed a reversible increase in the plasmatic levels of uric acid in patients treated with cyclosporine, which was positively correlated to an increase in VLDL triglycerides. Hence, the cyclosporine produced an increase of uric acid which was neither observed when associated to prednisone nor in the group of self-transplanted patients.
Assuntos
Transplante de Medula Óssea , Ciclosporina/farmacologia , Ácido Úrico/sangue , Humanos , Prednisona/farmacologiaRESUMO
SCOPE: Heating during the process of cooking alters the chemical properties of foods and may affect subsequent postprandial inflammation. We tested the effects of four meals rich in different oils subjected to heating on the postprandial inflammatory metabolism of peripheral blood mononuclear cells (PBMCs). METHODS AND RESULTS: Twenty obese participants received four breakfasts following a randomized crossover design, consisting of milk and muffins made with different oils (virgin olive oil (VOO), sunflower oil (SFO), and a mixture of seeds oil (SFO/canola oil) with added either dimethylpolysiloxane (SOD), or natural antioxidants from olive mill wastewater alperujo (phenols; SOP)), previously subjected to 20 heating cycles. Postprandial inflammatory status in PBMCs was assessed by the activation of nuclear NF-κB, the concentration in cytoplasm of the NF-κB inhibitor (IκB-α), the mRNA levels of NF-κB subunits and activators (p65, IKKß, and IKKα) and other inflammatory molecules (TNF-α, IL-1ß, IL-6, MIF, and JNK), and lipopolysaccharide (LPS) levels. VOO and SOP breakfasts reduced NF-κB activation, increased IκB-α, and decreased LPS plasma concentration. SFO increased IKKα, IKKß, p65, IL-1b, IL-6, MIF, and JNK mRNA levels, and plasma LPS. CONCLUSION: Oils rich in phenols, whether natural (VOO) or artificially added (SOP), reduce postprandial inflammation, compared with seed oil (sunflower).
Assuntos
Antioxidantes/administração & dosagem , Ácidos Graxos Monoinsaturados/administração & dosagem , Obesidade/metabolismo , Fenol/administração & dosagem , Óleos de Plantas/administração & dosagem , Estudos Cross-Over , Dimetilpolisiloxanos/metabolismo , Ácidos Graxos Monoinsaturados/química , Manipulação de Alimentos/métodos , Temperatura Alta , Humanos , Quinase I-kappa B/sangue , Proteínas I-kappa B/sangue , Inflamação/tratamento farmacológico , Interleucina-1beta/sangue , Interleucina-6/sangue , Leucócitos Mononucleares/efeitos dos fármacos , Leucócitos Mononucleares/metabolismo , Lipopolissacarídeos/sangue , Pessoa de Meia-Idade , Inibidor de NF-kappaB alfa , NF-kappa B/sangue , Obesidade/fisiopatologia , Azeite de Oliva , Óleos de Plantas/química , Período Pós-Prandial , Óleo de Brassica napus , Óleo de Girassol , Fator de Necrose Tumoral alfa/metabolismoRESUMO
1. Ageing represents a great concern in developed countries because the number of people involved and the pathologies related with it, like atherosclerosis, morbus Parkinson, Alzheimer's disease, vascular dementia, cognitive decline, diabetes and cancer. 2. Epidemiological studies suggest that a Mediterranean diet (which is rich in virgin olive oil) decreases the risk of cardiovascular disease. 3. The Mediterranean diet, rich in virgin olive oil, improves the major risk factors for cardiovascular disease, such as the lipoprotein profile, blood pressure, glucose metabolism and antithrombotic profile. Endothelial function, inflammation and oxidative stress are also positively modulated. Some of these effects are attributed to minor components of virgin olive oil. Therefore, the definition of the Mediterranean diet should include virgin olive oil. 4. Different observational studies conducted in humans have shown that the intake of monounsaturated fat may be protective against age-related cognitive decline and Alzheimer's disease. 5. Microconstituents from virgin olive oil are bioavailable in humans and have shown antioxidant properties and capacity to improve endothelial function. Furthermore they are also able to modify the haemostasis, showing antithrombotic properties. 6. In countries where the populations fulfilled a typical Mediterranean diet, such as Spain, Greece and Italy, where virgin olive oil is the principal source of fat, cancer incidence rates are lower than in northern European countries. 7. The protective effect of virgin olive oil can be most important in the first decades of life, which suggests that the dietetic benefit of virgin olive oil intake should be initiated before puberty, and maintained through life. 8. The more recent studies consistently support that the Mediterranean diet, based in virgin olive oil, is compatible with a healthier ageing and increased longevity. However, despite the significant advances of the recent years, the final proof about the specific mechanisms and contributing role of the different components of virgin olive oil to its beneficial effects requires further investigations.
Assuntos
Doenças Cardiovasculares/prevenção & controle , Dieta Mediterrânea , Neoplasias/prevenção & controle , Óleos de Plantas , Envelhecimento/efeitos dos fármacos , Gorduras Insaturadas na Dieta/farmacologia , Medicina Baseada em Evidências , Humanos , Azeite de Oliva , Estresse Oxidativo/efeitos dos fármacos , Óleos de Plantas/química , Óleos de Plantas/farmacologiaRESUMO
In the present study, the effect of TRH on amylase secretion was determined both in vivo, by cannulating the pancreatic duct of rats, as well as in vitro, by using isolated lobules and dissociated acini. The results show that TRH inhibited both basal and stimulated in vivo amylase secretion. Nevertheless, the in vitro experiments failed to show a TRH-related inhibitory effect when TRH was used alone, although the hormone did blunt the secretion elicited by CCK8 and bethanechol from isolated lobules and dissociated acini. Results suggest that TRH can inhibit stimulated amylase secretion in rats through a direct effect on acinar cells.
Assuntos
Amilases/metabolismo , Pâncreas/efeitos dos fármacos , Hormônio Liberador de Tireotropina/farmacologia , Animais , Betanecol , Compostos de Betanecol/antagonistas & inibidores , Compostos de Betanecol/farmacologia , Masculino , Pâncreas/metabolismo , Ratos , Ratos Endogâmicos , Taxa Secretória/efeitos dos fármacos , Sincalida/antagonistas & inibidores , Sincalida/farmacologiaRESUMO
We have studied ambulatory hypertensive patients by means of a survey protocol, in order to observe the possible causes of inadequate control. In 8% of patients, hygienic and dietetic measures were applied, specially low-salt diet and weight loss. This percentage is very low compared to that reported by other authors. A 67% of our patients received monotherapy, being diuretics the most frequently used drug. A 71% of patients fulfilled (correctly) the prescribed drug treatment, independently of its complexity and the arterial hypertension evolution time. The degree of good treatment fulfillment, in relation to the scarce fulfillment of hygienic and dietetic measures, make us believe that in our environment patients trust drugs effects more than that of the diet. We believe that this is due, in part, to the fact that health professionals do not insist sufficiently in its fulfillment. Patient follow-up was satisfactory in only 46% of them, which conditioned the fact that hypertension control was efficient in only 39% of total. We suggest the importance of treatment and control programs in primary assistance given the better results claimed by other authors who worked with patients following protocols. Only thus the Internal Medicine Departments could be relieved from problems derived from these patients.
Assuntos
Hipertensão/tratamento farmacológico , Cooperação do Paciente , População Urbana , Anti-Hipertensivos/uso terapêutico , Quimioterapia Combinada , Feminino , Seguimentos , Humanos , Hipertensão/epidemiologia , Masculino , Pessoa de Meia-Idade , Espanha/epidemiologia , Recusa do Paciente ao Tratamento , População Urbana/estatística & dados numéricosRESUMO
The plasma lipid response to changes in dietary fat and cholesterol can vary between individuals. At present, responders cannot be identified in advance. An adenine to guanine (A-->G) mutation in the promoter of the apolipoprotein A1 gene (apoA-1) has been suggested as affecting plasma high-density lipoprotein cholesterol. In 50 young men we examined the effect of the same mutation on the responses of both high and low density lipoprotein cholesterol to low-fat diet. The frequency for the A allele was 0.14. Subjects were fed a low-fat diet for 25 days, followed by a diet rich in monounsaturated fatty acid (MUFA, 22% out of 40% fat) for 28 days and lipoproteins were measured at the end of each diet. There were no differences in initial total cholesterol between subjects with the G/G mutation (170 mg/dL: 100 mg/dL = 2.59 mmol/L) and the G/A mutation (169 mg/dL) genotypes. After consumption of the high monounsaturated fat diet, significant increases were noted in plasma LDL cholesterol (10 mg/dL, p = 0.035) in the G/A subjects but not in the G/G subjects (1 mg/dL, p = 0.996). These differences showed that a significant diet-gene interaction (p = 0.015) existed. No differences were observed on HDL cholesterol between groups. Plasma low-density lipoprotein cholesterol responsiveness to diet may be explained by variation at the apoA-I gene locus.
Assuntos
Apolipoproteína A-I/genética , Colesterol na Dieta/metabolismo , LDL-Colesterol/sangue , Gorduras na Dieta/metabolismo , Regiões Promotoras Genéticas , Adulto , Alelos , Sequência de Bases , Colesterol na Dieta/administração & dosagem , LDL-Colesterol/genética , Primers do DNA/química , Gorduras na Dieta/administração & dosagem , Humanos , Masculino , Dados de Sequência Molecular , Mutação , FenótipoRESUMO
Previous studies have shown that the A-IV-347Ser polymorphism is associated with the variability in low density lipoprotein (LDL)-cholesterol response to dietary therapy. The present study was designed to evaluate the association of this polymorphism with the individual variability observed in postprandial lipemic response. This polymorphism was characterized in 50 healthy male subjects homozygous for the apolipoprotein (apo)E3 allele. All subjects were subjected to a vitamin A-fat load test. Blood was drawn at time 0 and every hour over a period of 11 hours. Cholesterol and triglycerides (TG) in plasma and lipoprotein fractions of CH, TG, and retinyl palmitate (RP) were determined. Data from the postprandial lipemia revealed that subjects with the A-IV-347Ser allele (n = 14) have a lower postprandial response in total TG (P < 0.025), large triglyceride rich lipoproteins (TRL) TG (P < 0.02), and small-TRL TG levels (P < 0.007), and a higher postprandial response in large-TRL apoA-IV (P < 0.006) and apoB-100 (P < 0.041) levels than subjects homozygous for the A-IV-347Thr subjects (n = 36). In conclusion, the modifications observed in postprandial lipoprotein metabolism associated with this polymorphism within the apoA-IV gene locus may be involved in the variability in LDL-CH response observed in subjects consuming high saturated fat diets.
Assuntos
Apolipoproteínas A/genética , LDL-Colesterol/metabolismo , Gorduras na Dieta/farmacocinética , Variação Genética , Adolescente , Adulto , Análise de Variância , Mapeamento Cromossômico , Humanos , Metabolismo dos Lipídeos , Masculino , Taxa de Depuração Metabólica , Pessoa de Meia-Idade , Mutação , Período Pós-PrandialRESUMO
Lipid response to dietary fat and cholesterol is, to a large extent, genetically controlled. Apoprotein (apo) A-IV has been related to fat absorption and to the activation of some of the enzymes involved in lipid metabolism. One mutation has been described in the apo A-IV gene that causes substitution of Ser for Thr at position 347. To study the influence of this mutation on the plasma LDL cholesterol (LDL-C) response in diets of various fat content and fatty acid saturation, 41 healthy male subjects were studied, 25 of whom were homozygous for the Thr allele (347Thr) and the rest who were either homozygous (n = 2) or heterozygous carriers of the Ser allele (347Ser). They consumed three consecutive diets, each of 4 weeks' duration: one rich in saturated fat (SFA diet: 38% fat, 20% saturated), a National Cholesterol Education Program (NCEP) type 1 diet (28% fat, 10% saturated), and a third rich in monounsaturated fat (MUFA diet; 38% fat, 22% monounsaturated). Carriers of the 347Ser allele presented a greater decrease in total cholesterol (-0.7 vs -0.44 mmol/L, P < .034), LDL-C (-0.62 vs -0.31 mmol/L, P < .012), and apo B (-14 vs -8 mg/dL, P < .01) levels when they were switched from the SFA to the NCEP type 1 diet than homozygous carriers of the 347Thr allele. The change from the NCEP type 1 to the MUFA diet resulted in a greater increase in total cholesterol (0.18 vs -0.05 mmol/L, P < .028) and apo B (5 vs -1 mg/dL, P < .006) levels in the 347Ser than in the 347Thr individuals. In a previous study, we demonstrated that the G-->A polymorphism at position -76 of the gene promoter of apo A-I affects the LDL-C response to dietary fat. We therefore decided to study the effect of the interaction between these mutations on this response. We found that both mutations have an additive effect on total cholesterol, LDL-C, and apo B dietary-induced changes. Our results suggest that total cholesterol and LDL-C response to dietary fat is influenced by the 347Ser mutation of apo A-IV.
Assuntos
Apolipoproteínas A/genética , LDL-Colesterol/sangue , Gorduras na Dieta/farmacologia , Serina/genética , Adulto , Índice de Massa Corporal , Ácidos Graxos Monoinsaturados/farmacologia , Genótipo , Homozigoto , Humanos , Lipídeos/sangue , Masculino , Mutação , Análise de RegressãoRESUMO
Apolipoprotein B (apo B) plays a dominant role in cholesterol homeostasis. Several polymorphic sites within or adjacent to the gene locus for apo B have been detected. The X+ allele (XbaI restriction site present) of the XbaI restriction fragment polymorphism on the apo B gene has been found in some studies to be associated with higher serum cholesterol and/or triglyceride levels and with greater dietary response. The present study was designed to evaluate whether the apo B XbaI polymorphism was associated with the interindividual variability observed during postprandial lipemia. Fifty-one healthy young male volunteers [20 X-/X- (X-), and 31 X+/X- or X+/X+ (X+)], homozygotes for the apo E3 allele, were subjected to a vitamin A-fat load test. Subjects with the X- genotype had significantly greater retinyl palmitate (RP) and apo B-48 postprandial responses on both the large and the small TRL lipoprotein fractions compared with X+ subjects. In summary, subjects with the X-/X- genotype at the apo B locus have a greater postprandial response than X+ subjects. These differences observed in postprandial lipoprotein metabolism could explain some of the reported associations of this polymorphism to coronary heart disease risk.