RESUMO
Smith-Lemli-Opitz syndrome (SLOS) is a severe monogenic disorder resulting in low cholesterol and high 7-dehydrocholesterol (7-DHC) levels. 7-DHC-derived oxysterols likely contribute to disease pathophysiology, and thus antioxidant treatment might be beneficial because of high oxidative stress. In a three-year prospective study, we investigated the effects of vitamin E supplementation in six SLOS patients already receiving dietary cholesterol treatment. Plasma vitamin A and E concentrations were determined by the high-performance liquid chromatography (HPLC) method. At baseline, plasma 7-DHC, 8-dehydrocholesterol (8-DHC) and cholesterol levels were determined by liquid chromatography-tandem mass spectrometry (LC-MS/MS) method. The clinical effect of the supplementation was assessed by performing structured parental interviews. At baseline, patients were characterized by low or low-normal plasma vitamin E concentrations (7.19-15.68 µmol/L), while vitamin A concentrations were found to be normal or high (1.26-2.68 µmol/L). Vitamin E supplementation resulted in correction or significant elevation of plasma vitamin E concentration in all patients. We observed reduced aggression, self-injury, irritability, hyperactivity, attention deficit, repetitive behavior, sleep disturbance, skin photosensitivity and/or eczema in 3/6 patients, with notable individual variability. Clinical response to therapy was associated with a low baseline 7-DHC + 8-DHC/cholesterol ratio (0.2-0.4). We suggest that determination of vitamin E status is important in SLOS patients. Supplementation of vitamin E should be considered and might be beneficial.
Assuntos
Suplementos Nutricionais , Síndrome de Smith-Lemli-Opitz/sangue , Síndrome de Smith-Lemli-Opitz/terapia , Vitamina E/uso terapêutico , Adolescente , Alelos , Antioxidantes/metabolismo , Comportamento , Criança , Pré-Escolar , Colesterol na Dieta/metabolismo , Cromatografia Líquida de Alta Pressão , Cromatografia Líquida , Desidrocolesteróis/sangue , Feminino , Humanos , Lipídeos/química , Masculino , Estresse Oxidativo , Oxirredutases atuantes sobre Doadores de Grupo CH-CH/genética , Oxisteróis/metabolismo , Estudos Prospectivos , Esteróis/química , Espectrometria de Massas em Tandem , Vitamina A/metabolismo , Vitamina E/metabolismo , Adulto JovemRESUMO
BACKGROUND AND AIMS: Hypercholesterolemia is a major risk factor for atherosclerosis and cardiovascular diseases. Although resistant to hypercholesterolemia, the mouse is a prominent model in cardiovascular research. To assess the contribution of bile acids to this protective phenotype, we explored the impact of a 2-week-long dietary cholesterol overload on cholesterol and bile acid metabolism in mice. METHODS: Bile acid, oxysterol, and cholesterol metabolism and transport were assessed by quantitative real-time PCR, western blotting, GC-MS/MS, or enzymatic assays in the liver, the gut, the kidney, as well as in the feces, the blood, and the urine. RESULTS: Plasma triglycerides and cholesterol levels were unchanged in mice fed a cholesterol-rich diet that contained 100-fold more cholesterol than the standard diet. In the liver, oxysterol-mediated LXR activation stimulated the synthesis of bile acids and in particular increased the levels of hydrophilic muricholic acids, which in turn reduced FXR signaling, as assessed in vivo with Fxr reporter mice. Consequently, biliary and basolateral excretions of bile acids and cholesterol were increased, whereas portal uptake was reduced. Furthermore, we observed a reduction in intestinal and renal bile acid absorption. CONCLUSIONS: These coordinated events are mediated by increased muricholic acid levels which inhibit FXR signaling in favor of LXR and SREBP2 signaling to promote efficient fecal and urinary elimination of cholesterol and neo-synthesized bile acids. Therefore, our data suggest that enhancement of the hydrophilic bile acid pool following a cholesterol overload may contribute to the resistance to hypercholesterolemia in mice. This work paves the way for new therapeutic opportunities using hydrophilic bile acid supplementation to mitigate hypercholesterolemia.
Assuntos
Ácidos e Sais Biliares/metabolismo , Colesterol na Dieta/efeitos adversos , Ácidos Cólicos/uso terapêutico , Hipercolesterolemia/prevenção & controle , Animais , Colesterol na Dieta/metabolismo , Avaliação Pré-Clínica de Medicamentos , Hipercolesterolemia/etiologia , Masculino , Camundongos Endogâmicos C57BL , Receptores Citoplasmáticos e Nucleares/metabolismoRESUMO
Ursolic acid (UA) is a triterpenoid acid widely abundant in fruits and vegetables such as apple, blueberry and cranberry. The present study was carried out to investigate the effect of UA supplementation in diet on blood cholesterol, intestinal cholesterol absorption and gut microbiota in hypercholesterolemic hamsters. A total of thirty-two hamsters were randomly assigned to four groups and given a non-cholesterol diet (NCD), a high-cholesterol diet containing 0.1% cholesterol (HCD), an HCD diet containing 0.2% UA (UAL), or an HCD diet containing 0.4% UA (UAH) for 6 weeks. Results showed that UA supplementation reduced plasma cholesterol by 15-16% and inhibited intestinal cholesterol absorption by 2.6-9.2%. The in vitro micellar cholesterol solubility experiment clearly demonstrated that UA could displace 40% cholesterol from micelles. In addition, UA decreased the ratio of Firmicutes to Bacteroidetes, whereas it enhanced the growth of short chain fatty acid (SCFA)-producing bacteria in the intestine. In conclusion, UA possessed a cholesterol-lowering activity and could favorably modulate the gut microbiota.
Assuntos
Bactérias/efeitos dos fármacos , Colesterol na Dieta/metabolismo , Suplementos Nutricionais , Microbioma Gastrointestinal/efeitos dos fármacos , Hipercolesterolemia/tratamento farmacológico , Absorção Intestinal/efeitos dos fármacos , Triterpenos/farmacologia , Animais , Anticolesterolemiantes/farmacologia , Anticolesterolemiantes/uso terapêutico , Bacteroidetes/efeitos dos fármacos , Colesterol na Dieta/efeitos adversos , Colesterol na Dieta/sangue , Cricetinae , Dieta , Dieta Hiperlipídica/efeitos adversos , Ácidos Graxos Voláteis/metabolismo , Firmicutes/efeitos dos fármacos , Hipercolesterolemia/etiologia , Hipercolesterolemia/metabolismo , Intestinos/efeitos dos fármacos , Intestinos/microbiologia , Masculino , Mesocricetus , Micelas , Distribuição Aleatória , Solubilidade , Triterpenos/uso terapêutico , Ácido UrsólicoRESUMO
The aim is to test the hypothesis whether the cholesterol loaded lysosomes are capable of mediating lysosomal membrane permeabilization (LMP) during aging and to study the efficacy of epigallocatechin-3-gallate (EGCG) in preserving the lysosomal membrane stability. Aged rats were fed with high cholesterol diet (HCD) and treated with EGCG orally. Serum and tissue lipid status, cholesterol levels in lysosomal fraction, activities of lysosomal enzymes in lysosomal, and cytosolic fractions were measured. Transmission electron microscopic studies (TEM), oil red "O" (ORO) staining, and immunohistochemical analysis of oxidized low density lipoprotein (OxLDL) were carried out. Significant increase in serum, tissue lipid profile, and lysosomal cholesterol levels were observed in aged HCD-fed rats with a concomitant decrease in high density lipoprotein (HDL) levels. We also observed a significant increase in lipid accumulation in hepatocytes of aged HCD-fed rats by TEM, ORO, and immunohistochemical staining. Upon treatment with EGCG to aged HCD-fed animals, we found augmented levels of HDL with a concomitant decrease in lysosomal cholesterol levels and other lipoproteins. TEM studies and immunohistochemistry of OxLDL also showed a marked reduction in lipid deposition of hepatocytes. Thus, EGCG has preserved the lysosomal membrane stability in HCD stressed aged rats. SIGNIFICANCE OF THE STUDY: The research article is focused mainly on the effect of EGCG and its capability on mitigating the release of lysosomal enzymes in aged animals fed with HCD. The study signifies the cellular function of the organelle lysosome following administration of aged rats with HCD, which would make the readers to understand the action of EGCG and the interrelationship of both cholesterol and activity of lysosomes when cholesterol is loaded.
Assuntos
Catequina/análogos & derivados , Colesterol na Dieta/metabolismo , Fígado/efeitos dos fármacos , Lisossomos/efeitos dos fármacos , Envelhecimento , Animais , Antioxidantes/química , Catequina/farmacologia , Citosol/metabolismo , Suplementos Nutricionais , Hepatócitos/efeitos dos fármacos , Imuno-Histoquímica , Lipídeos/química , Lipoproteínas LDL/química , Lisossomos/enzimologia , Masculino , Microscopia Eletrônica de Transmissão , Estresse Oxidativo , Oxigênio/química , Ratos , Ratos WistarRESUMO
BACKGROUND: Trimethylamine N-oxide (TMAO) has been shown to be involved in cardiovascular disease (CVD). However, its role in nonalcoholic steatohepatitis (NASH) is unknown. AIM: To determine the effect of TMAO on the progression of NASH. METHODS: A rat model was induced by 16-wk high-fat high-cholesterol (HFHC) diet feeding and TMAO was administrated by daily oral gavage for 8 wk. RESULTS: Oral TMAO intervention attenuated HFHC diet-induced steatohepatitis in rats. Histological evaluation showed that TMAO treatment significantly alleviated lobular inflammation and hepatocyte ballooning in the livers of rats fed a HFHC diet. Serum levels of alanine aminotransferase and aspartate aminotransferase were also decreased by TMAO treatment. Moreover, hepatic endoplasmic reticulum (ER) stress and cell death were mitigated in HFHC diet-fed TMAO-treated rats. Hepatic and serum levels of cholesterol were both decreased by TMAO treatment in rats fed a HFHC diet. Furthermore, the expression levels of intestinal cholesterol transporters were detected. Interestingly, cholesterol influx-related Niemann-Pick C1-like 1 was downregulated and cholesterol efflux-related ABCG5/8 were upregulated by TMAO treatment in the small intestine. Gut microbiota analysis showed that TMAO could alter the gut microbial profile and restore the diversity of gut flora. CONCLUSION: These data suggest that TMAO may modulate the gut microbiota, inhibit intestinal cholesterol absorption, and ameliorate hepatic ER stress and cell death under cholesterol overload, thereby attenuating HFHC diet-induced steatohepatitis in rats. Further studies are needed to evaluate the influence on CVD and define the safe does of TMAO treatment.
Assuntos
Fígado/efeitos dos fármacos , Metilaminas/administração & dosagem , Hepatopatia Gordurosa não Alcoólica/tratamento farmacológico , Administração Oral , Animais , Colesterol na Dieta/efeitos adversos , Colesterol na Dieta/metabolismo , Dieta Hiperlipídica/efeitos adversos , Modelos Animais de Doenças , Progressão da Doença , Avaliação Pré-Clínica de Medicamentos , Estresse do Retículo Endoplasmático/efeitos dos fármacos , Microbioma Gastrointestinal/efeitos dos fármacos , Humanos , Absorção Intestinal/efeitos dos fármacos , Mucosa Intestinal/efeitos dos fármacos , Mucosa Intestinal/metabolismo , Fígado/patologia , Masculino , Hepatopatia Gordurosa não Alcoólica/etiologia , Hepatopatia Gordurosa não Alcoólica/patologia , Ratos , Ratos Sprague-Dawley , Resultado do TratamentoRESUMO
We hypothesized that schizandrin (SCH) A, a lignan found in the fruits of the Schisandra genus, would exert protective effects against high-fat and high-cholesterol (HFHC) diet-induced nonalcoholic fatty liver disease (NAFLD) via regulation of lipid metabolism and oxidative stress. To test our hypothesis, male C57BL/6J mice were fed an HFHC diet with or without SCH A for 15â¯weeks. There were no significant differences in food intake, body weight, fat mass, and plasma total cholesterol level between the 2 groups. However, supplementation of SCH A significantly decreased levels of plasma free fatty acid and triglyceride, whereas plasma high-density lipoprotein cholesterol level was increased in the SCH A-supplemented mice. Moreover, hepatic free fatty acid, triglyceride, and cholesterol content, as well as hepatic lipid droplet accumulation, were markedly lower in the SCH A group in contrast to the control group. Activity of hepatic enzymes involved in fatty acid and triglyceride synthesis was significantly decreased by SCH A supplementation, whereas SCH A markedly increased hepatic ß-oxidation and fatty acid oxidation-related gene expression as well as fecal excretion of free fatty acid and triglyceride. SCH A also significantly increased expression of genes involved in cholesterol homeostasis (biliary cholesterol excretion and cholesterol efflux to high-density lipoprotein) in the liver. Moreover, SCH A significantly decreased hepatic lipid peroxidation, which was accompanied by increased hepatic antioxidant enzymes activity. These results suggest that SCH A could alleviate HFHC diet-induced NAFLD by regulating hepatic lipid metabolism and oxidative stress as well as fecal lipid excretion.
Assuntos
Colesterol na Dieta/metabolismo , Ciclo-Octanos/uso terapêutico , Lignanas/uso terapêutico , Metabolismo dos Lipídeos/efeitos dos fármacos , Fígado/efeitos dos fármacos , Hepatopatia Gordurosa não Alcoólica/tratamento farmacológico , Estresse Oxidativo/efeitos dos fármacos , Compostos Policíclicos/uso terapêutico , Schisandra/química , Animais , Antioxidantes/metabolismo , Colesterol/sangue , Colesterol/metabolismo , Colesterol na Dieta/administração & dosagem , Colesterol na Dieta/efeitos adversos , Colesterol na Dieta/sangue , HDL-Colesterol/sangue , Ciclo-Octanos/farmacologia , Dieta Hiperlipídica , Gorduras na Dieta/administração & dosagem , Gorduras na Dieta/efeitos adversos , Gorduras na Dieta/metabolismo , Suplementos Nutricionais , Ácidos Graxos/metabolismo , Ácidos Graxos não Esterificados/sangue , Fezes/química , Lignanas/farmacologia , Fígado/metabolismo , Masculino , Camundongos Endogâmicos C57BL , Hepatopatia Gordurosa não Alcoólica/sangue , Hepatopatia Gordurosa não Alcoólica/etiologia , Hepatopatia Gordurosa não Alcoólica/metabolismo , Fitoterapia , Extratos Vegetais/farmacologia , Extratos Vegetais/uso terapêutico , Compostos Policíclicos/farmacologia , Triglicerídeos/sangueRESUMO
Heating oils and fats for a considerable length of time results in chemical reactions, leading to the aggravation of a free radical processes, which ultimately contributes to atherosclerosis. Our study focused on elucidating the effect of feeding heated oils with or without dietary cholesterol on the development of atherosclerosis in rabbits. We heated palm olein and corn oil at 180 °C for 18 h and 9 h per day, respectively, for two consecutive days. Next, 20 male rabbits were divided into four groups and fed the following diet for 12 weeks: (i) heated palm olein (HPO); (ii) HPO with cholesterol (HPOC); (iii) heated corn oil (HCO); and (iv) HCO with cholesterol (HCOC). Plasma total cholesterol (TC) was significantly lower in the HCO group compared to the HCOC group. Atherosclerotic lesion scores for both fatty plaques and fatty streaks were significantly higher in the HCO and HCOC groups as compared to the HPO and HPOC groups. Additionally, fibrous plaque scores were also higher in the HCO and HCOC groups as compared to the HPO and HPOC groups. These results suggest that heated palm oil confers protection against the onset of atherosclerosis compared to heated polyunsaturated oils in a rabbit model.
Assuntos
Aterosclerose , Óleo de Coco/farmacologia , Culinária , Dieta , Gorduras na Dieta/farmacologia , Ácidos Graxos/farmacologia , Temperatura Alta , Animais , Aterosclerose/sangue , Aterosclerose/etiologia , Aterosclerose/patologia , Aterosclerose/prevenção & controle , Colesterol/sangue , Colesterol/metabolismo , Colesterol/farmacologia , Colesterol na Dieta/efeitos adversos , Colesterol na Dieta/metabolismo , Colesterol na Dieta/farmacologia , Óleo de Coco/metabolismo , Óleo de Milho/metabolismo , Óleo de Milho/farmacologia , Gorduras na Dieta/efeitos adversos , Gorduras na Dieta/metabolismo , Ácidos Graxos/efeitos adversos , Ácidos Graxos/metabolismo , Masculino , Óleo de Palmeira/metabolismo , Óleo de Palmeira/farmacologia , Óleos de Plantas/efeitos adversos , Óleos de Plantas/metabolismo , Óleos de Plantas/farmacologia , Coelhos , Triglicerídeos/sangueRESUMO
The present study explored the effect of cholesterol on the immunity and inflammation response in the immune organs (head kidney, spleen and skin) of young grass carp (Ctenopharyngodon idella) fed graded levels of dietary cholesterol (0.041-1.526%) for 60 days and then infected with Aeromonas hydrophila for 14 days. The results showed that low levels of cholesterol (1) depressed the innate immune components [lysozyme (LZ), acid phosphatase (ACP), complements and antimicrobial peptides] and adaptive immune component [immunoglobulin M (IgM)], (2) up-regulated the mRNA levels of pro-inflammatory cytokines [interleukin 1ß (IL-1ß), IL-6, IL-8, IL-12p35, IL-12p40, IL-15, IL-17D, tumor necrosis factor α (TNF-α) and interferon γ2 (IFN-γ2)], partly due to the activated nuclear factor kappa B (NF-κB) signalling, and (3) down-regulated the mRNA levels of anti-inflammatory cytokines [IL-4/13B, IL-10, IL-11, transforming growth factor (TGF)-ß1 and TGF-ß2], partly due to the suppression of target of rapamycin (TOR) signalling in the immune organs of young grass carp. Interestingly, dietary cholesterol had no influences on the IκB kinase α (IKKα) and IL-4/13A mRNA levels in the head kidney, spleen and skin, the IL-1ß and IL-12p40 mRNA levels in the spleen and skin, or the ß-defensin-1 mRNA level in the skin of young grass carp. Additionally, low levels of cholesterol increased the skin haemorrhage and lesion morbidity. In summary, low levels of cholesterol impaired immunity by depressing the innate and adaptive immune components, and low levels of cholesterol aggravated the inflammation response via up-regulating the expression of pro-inflammatory cytokines as well as down-regulating the expression of anti-inflammatory cytokines partly through the modulation of NF-κB and TOR signalling in the immune organs of fish. Similar to the low level of cholesterol, the excess level of dietary cholesterol impaired immunity and aggravated inflammation response in the immune organs of fish. Finally, based on the percent weight gain (PWG), the ability against skin haemorrhage and lesions as well as the LZ activity in the head kidney and the ACP activity in the spleen, the optimal dietary cholesterol levels for young grass carp were estimated as 0.721, 0.826, 0.802 and 0.772% diet, respectively.
Assuntos
Imunidade Adaptativa/efeitos dos fármacos , Carpas/imunologia , Colesterol na Dieta/metabolismo , Citocinas/metabolismo , Doenças dos Peixes/imunologia , Imunidade Inata/efeitos dos fármacos , Inflamação/imunologia , Aeromonas hydrophila/fisiologia , Ração Animal/análise , Animais , Colesterol na Dieta/administração & dosagem , Dieta/veterinária , Suplementos Nutricionais/análise , Relação Dose-Resposta a Droga , Infecções por Bactérias Gram-Negativas/imunologia , Distribuição Aleatória , Transdução de Sinais/efeitos dos fármacosRESUMO
Background: Lipoapoptosis has been identified as a key event in the progression of nonalcoholic fatty liver disease (NAFLD), and hence, antiapoptotic agents have been recommended as a possible effective treatment for nonalcoholic steatohepatitis (NASH). Silicon, included in meat as a functional ingredient, improves lipoprotein profiles and liver antioxidant defenses in aged rats fed a high-saturated fat, high-cholesterol diet (HSHCD). However, to our knowledge, the antiapoptotic effect of this potential functional meat on the liver has never been tested.Objective: This study was designed to evaluate the effect of silicon on NASH development and the potential antiapoptotic properties of silicon in aged rats.Methods: One-year-old male Wistar rats weighing â¼500 g were fed 3 experimental diets containing restructured pork (RP) for 8 wk: 1) a high-saturated fat diet, as an NAFLD control, with 16.9% total fat, 0.14 g cholesterol/kg diet, and 46.8 mg SiO2/kg (control); 2) the HSHCD as a model of NASH, with 16.6% total fat, 16.3 g cholesterol/kg diet, and 46.8 mg SiO2/kg [high-cholesterol diet (Chol-C)]; and 3) the HSHCD with silicon-supplemented RP with amounts of fat and cholesterol identical to those in the Chol-C diet, but with 750 mg SiO2/kg (Chol-Si). Detailed histopathological assessments were performed, and the NAFLD activity score (NAS) was calculated. Liver apoptosis and damage markers were evaluated by Western blotting and immunohistochemical staining.Results: Chol-C rats had a higher mean NAS (7.4) than did control rats (1.9; P < 0.001). The score in Chol-Si rats (5.4) was intermediate and different from that in both other groups (P < 0.05). Several liver apoptosis markers-including hepatocyte terminal deoxynucleotidyl transferase 2'-deoxyuridine 5'-triphosphate (dUTP) nick end labeling, cytosolic cytochrome c, apoptosis-inducing factor, caspases 9 and 3, and the mitochondrial Bcl-2-associated X protein (BAX)-to-B-cell lymphoma 2 (BCL2) ratio-were 9-45% lower in Chol-Si than in Chol-C rats (P < 0.05) and did not differ from values in the control group.Conclusions: Supplemental silicon substantially affects NASH development in aged male Wistar rats fed an HSHCD by partially blocking apoptosis. These results suggest that silicon-enriched RP could be used as an effective nutritional strategy in preventing NASH.
Assuntos
Apoptose/efeitos dos fármacos , Colesterol na Dieta/administração & dosagem , Dieta Hiperlipídica , Fígado/efeitos dos fármacos , Hepatopatia Gordurosa não Alcoólica/prevenção & controle , Carne Vermelha , Silício/uso terapêutico , Animais , Biomarcadores/metabolismo , Colesterol na Dieta/metabolismo , Fígado/metabolismo , Fígado/patologia , Masculino , Hepatopatia Gordurosa não Alcoólica/etiologia , Hepatopatia Gordurosa não Alcoólica/metabolismo , Hepatopatia Gordurosa não Alcoólica/patologia , Ratos Wistar , Silício/farmacologia , Dióxido de Silício/farmacologia , Dióxido de Silício/uso terapêutico , Suínos , Oligoelementos/farmacologia , Oligoelementos/uso terapêuticoRESUMO
Chia oil has the highest recognized α-linolenic acid (ALA) content. ALA is associated with beneficial changes in plasma lipids and the prevention of cardiovascular diseases. Present article aims to analyze the effect of Chia oil-enriched restructured pork (RP) on aged rats in a nonalcoholic steatohepatitis (NASH) model. Groups of six male Wistar rats (1-year old) were fed the experimental diets: control RP diet (C) noncholesterol high saturated; cholesterol-enriched high-saturated fat/high-cholesterol control RP diet (HC) with added cholesterol and cholic acid; and Chia oil- or Hydroxytyrosol RP cholesterol-enriched high-saturated fat/high cholesterol (CHIA and HxT). Total cholesterol, hepatosomatic index, Nrf2, antioxidant, and inflammation markers were determined. CHIA reduced the hypercholesterolemic effect by lowering levels similar to C; also, ameliorated redox index. CHIA, despite high polyunsaturated fatty acids (PUFA) content, reduced thiobarbituric acid reactive substances (TBARS) and induced the lowest SOD protein synthesis but not a reduction on its activity. Chia oil activated the Nrf2 to arrest the pro-oxidative response to cholesterol and aging. Endothelial nitric oxide synthase (eNOS) system was lower in HxT than in CHIA, suggesting its antiatherogenic activity and related protective effect against high PUFA. Increase in tumor necrosis factor alpha (TNFα) was partially blocked by CHIA. Chia oil has the ability to prevent oxidative damage and modify the inflammatory response, suggesting adequate regulation of the antioxidant system. Results stress the importance of incorporating ALA into the diet.
Assuntos
Envelhecimento , Colesterol na Dieta , Hipercolesterolemia , Carne , Hepatopatia Gordurosa não Alcoólica , Óleos de Plantas , Salvia , Animais , Humanos , Masculino , Ratos , Envelhecimento/efeitos dos fármacos , Envelhecimento/imunologia , Envelhecimento/metabolismo , Colesterol na Dieta/efeitos adversos , Colesterol na Dieta/metabolismo , Dieta Hiperlipídica/efeitos adversos , Hipercolesterolemia/dietoterapia , Hipercolesterolemia/genética , Hipercolesterolemia/imunologia , Hipercolesterolemia/metabolismo , Carne/análise , Hepatopatia Gordurosa não Alcoólica/dietoterapia , Hepatopatia Gordurosa não Alcoólica/genética , Hepatopatia Gordurosa não Alcoólica/imunologia , Hepatopatia Gordurosa não Alcoólica/metabolismo , Estresse Oxidativo , Óleos de Plantas/química , Óleos de Plantas/metabolismo , Ratos Wistar , Salvia/química , Suínos , Fator de Necrose Tumoral alfa/genética , Fator de Necrose Tumoral alfa/imunologiaRESUMO
BACKGROUND: Silkworm pupae is a good resource of edible oil that is especially rich in unsaturated fatty acids and is considered to be an excellent dietary supplement for hyperlipidemia. RESULTS: Groups fed a high-cholesterol diet (HCD) with silkworm pupae oil (SPO) supplementation (1, 2, or 4 mL kg-1 day-1 ) orally had significantly lower levels of serum total cholesterol (P < 0.05) and low-density lipoprotein cholesterol (P < 0.05) compared to the HCD group. With regard to antioxidant parameters, except for levels of glutathione peroxidase (GSH-Px) in the liver, 2 and 4 mL kg-1 day-1 of SPO supplementation leaded to higher total antioxidant capacity (P < 0.05), superoxide dismutase (P < 0.05) and GSH-Px levels (P < 0.05), as well as lower malondialdehyde levels (P < 0.05), both in serum and liver compared to the HCD group. CONCLUSION: The results of the present study indicate that supplementation with SPO can improve lipid profiles and alleviate oxidative stress in high-cholesterol diet-fed rats. © 2016 Society of Chemical Industry.
Assuntos
Antioxidantes/administração & dosagem , Fatores Biológicos/administração & dosagem , Bombyx/química , Colesterol na Dieta/metabolismo , Hipercolesterolemia/tratamento farmacológico , Pupa/química , Animais , Antioxidantes/isolamento & purificação , Fatores Biológicos/isolamento & purificação , Bombyx/crescimento & desenvolvimento , Colesterol na Dieta/efeitos adversos , LDL-Colesterol/metabolismo , Suplementos Nutricionais/análise , Glutationa Peroxidase/metabolismo , Humanos , Hipercolesterolemia/enzimologia , Hipercolesterolemia/etiologia , Hipercolesterolemia/metabolismo , Fígado/metabolismo , Masculino , Malondialdeído/metabolismo , Estresse Oxidativo/efeitos dos fármacos , Pupa/crescimento & desenvolvimento , Ratos , Ratos WistarRESUMO
Non-alcoholic steatohepatitis (NASH), is the form of non-alcoholic fatty liver disease posing risk to progress into serious long term complications. Human and pre-clinical models implicate cellular cholesterol dysregulation playing important role in its development. Mouse model studies suggest synergism between dietary cholesterol and fat in contributing to NASH but the mechanisms remain poorly understood. Our laboratory previously reported the primary importance of hepatic endoplasmic reticulum cholesterol (ER-Chol) in regulating hepatic ER stress by comparing the responses of wild type, Ldlr-/-xLcat+/+ and Ldlr-/-xLcat-/- mice, to a 2% high cholesterol diet (HCD). Here we further investigated the roles of ER-Chol and ER stress in HFHS diet-induced NASH using the same strains. With HFHS diet feeding, both WT and Ldlr-/-xLcat+/+ accumulate ER-Chol in association with ER stress and inflammasome activation but the Ldlr-/-xLcat-/- mice are protected. By contrast, all three strains accumulate cholesterol crystal, in correlation with ER-Chol, albeit less so in Ldlr-/-xLcat-/- mice. By comparison, HCD feeding per se (i) is sufficient to promote steatosis and activate inflammasomes, and (ii) results in dramatic accumulation of cholesterol crystal which is linked to inflammasome activation in Ldlr-/-xLcat-/- mice, independent of ER-Chol. Our data suggest that both dietary fat and cholesterol each independently promote steatosis, cholesterol crystal accumulation and inflammasome activation through distinct but complementary pathways. In vitro studies using palmitate-induced hepatic steatosis in HepG2 cells confirm the key roles by cellular cholesterol in the induction of steatosis and inflammasome activations. These novel findings provide opportunities for exploring a cellular cholesterol-focused strategy for treatment of NASH.
Assuntos
Colesterol na Dieta/metabolismo , Estresse do Retículo Endoplasmático/efeitos dos fármacos , Fígado/metabolismo , Hepatopatia Gordurosa não Alcoólica/genética , Fosfatidilcolina-Esterol O-Aciltransferase/genética , Receptores de LDL/genética , Animais , Colesterol na Dieta/efeitos adversos , Dieta Hiperlipídica/efeitos adversos , Modelos Animais de Doenças , Estresse do Retículo Endoplasmático/genética , Feminino , Regulação da Expressão Gênica , Células Hep G2 , Humanos , Inflamassomos/efeitos dos fármacos , Inflamassomos/metabolismo , Deficiência da Lecitina Colesterol Aciltransferase/genética , Deficiência da Lecitina Colesterol Aciltransferase/metabolismo , Metabolismo dos Lipídeos/genética , Fígado/patologia , Camundongos , Camundongos Endogâmicos C57BL , Camundongos Knockout , Hepatopatia Gordurosa não Alcoólica/etiologia , Hepatopatia Gordurosa não Alcoólica/metabolismo , Hepatopatia Gordurosa não Alcoólica/fisiopatologia , Oxirredução , Ácido Palmítico/farmacologia , Fosfatidilcolina-Esterol O-Aciltransferase/metabolismo , Receptores de LDL/deficiência , Transdução de SinaisRESUMO
This study was designed to investigate the effects of dietary taurine on cholesterol metabolism in high-cholesterol-fed rats. Male Sprague-Dawley rats were randomly divided into two dietary groups (n = 6 in each group): a high-cholesterol diet containing 0.5% cholesterol and 0.15% sodium cholate, and a high-cholesterol diet with 5% (w/w) taurine. The experimental diets were given for 2 weeks. Taurine supplementation reduced the serum and hepatic cholesterol levels by 37% and 32%, respectively. Faecal excretion of bile acids was significantly increased in taurine-treated rats, compared with untreated rats. Biliary bile acid concentrations were also increased by taurine. Taurine supplementation increased taurine-conjugated bile acids by 61% and decreased glycine-conjugated bile acids by 53%, resulting in a significant decrease in the glycine/taurine (G/T) ratio. Among the taurine-conjugated bile acids, cholic acid and deoxycholic acid were significantly increased. In the liver, taurine supplementation increased the mRNA expression and enzymatic activity of hepatic cholesterol 7α-hydroxylase (CYP7A1), the rate-limiting enzyme for bile acid synthesis, by three- and two-fold, respectively. Taurine also decreased the enzymatic activity of acyl-CoA:cholesterol acyltransferase (ACAT) and microsomal triglyceride transfer protein (MTP). These observations suggest that taurine supplementation increases the synthesis and excretion of taurine-conjugated bile acids and stimulates the catabolism of cholesterol to bile acid by elevating the expression and activity of CYP7A1. This may reduce cholesterol esterification and lipoprotein assembly for very low density lipoprotein (VLDL) secretion, leading to reductions in the serum and hepatic cholesterol levels.
Assuntos
Anticolesterolemiantes/farmacologia , Ácidos e Sais Biliares/biossíntese , Colesterol na Dieta/efeitos adversos , Colesterol na Dieta/metabolismo , Dieta Hiperlipídica/efeitos adversos , Taurina/farmacologia , Animais , Ácidos e Sais Biliares/metabolismo , Proteínas de Transporte/metabolismo , Colesterol 7-alfa-Hidroxilase/genética , Colesterol na Dieta/sangue , Regulação Enzimológica da Expressão Gênica/efeitos dos fármacos , Hidroximetilglutaril-CoA Redutases/metabolismo , Fígado/efeitos dos fármacos , Fígado/metabolismo , Masculino , RNA Mensageiro/genética , RNA Mensageiro/metabolismo , Ratos , Ratos Sprague-Dawley , Esterol O-Aciltransferase/metabolismoRESUMO
Dietary lipids are efficiently absorbed by the small intestine, incorporated into triglyceride-rich lipoproteins (chylomicrons), and transported in the circulation to various tissues. Intestinal lipid absorption and mobilization and chylomicron synthesis and secretion are highly regulated processes. Elevated chylomicron production rate contributes to the dyslipidemia seen in common metabolic disorders such as insulin-resistant states and type 2 diabetes and likely increases the risk for atherosclerosis seen in these conditions. An in-depth understanding of the regulation of chylomicron production may provide leads for the development of drugs that could be of therapeutic utility in the prevention of dyslipidemia and atherosclerosis. Chylomicron secretion is subject to regulation by various factors, including diet, body weight, genetic variants, hormones, nutraceuticals, medications, and emerging interventions such as bariatric surgical procedures. In this review we discuss the regulation of chylomicron production, mechanisms that underlie chylomicron dysregulation, and potential avenues for future research.
Assuntos
Quilomícrons/biossíntese , Homeostase/fisiologia , Aterosclerose/sangue , Colesterol na Dieta/metabolismo , Colesterol na Dieta/farmacologia , Quilomícrons/sangue , Quilomícrons/genética , Ritmo Circadiano , Diabetes Mellitus Tipo 2/sangue , Dieta , Gorduras na Dieta/metabolismo , Gorduras na Dieta/farmacocinética , Suplementos Nutricionais , Microbioma Gastrointestinal/fisiologia , Hormônios/fisiologia , Humanos , Resistência à Insulina , Absorção Intestinal , Mucosa Intestinal/metabolismo , Metabolismo dos Lipídeos/fisiologia , Fenômenos Fisiológicos da Nutrição , Triglicerídeos/biossíntese , Triglicerídeos/sangue , Triglicerídeos/genéticaRESUMO
Atherosclerosis, a major form of cardiovascular disease, has now been recognized as a chronic inflammatory disease. Nonpharmacological means of treating chronic diseases have gained attention recently. We previously reported that sesame oil has anti-atherosclerotic properties. In this study, we have determined the mechanisms by which sesame oil might modulate atherosclerosis by identifying genes and inflammatory markers. Low-density lipoprotein receptor knockout (LDLR(-/-)) female mice were fed with either an atherogenic diet or an atherogenic diet reformulated with sesame oil (sesame oil diet). Plasma lipids and atherosclerotic lesions were quantified after 3 months of feeding. Plasma samples were used for cytokine analysis. RNA was extracted from the liver tissue and used for global gene arrays. The sesame oil diet significantly reduced atherosclerotic lesions, plasma cholesterol, triglyceride, and LDL cholesterol levels in LDLR(-/-) mice. Plasma inflammatory cytokines, such as MCP-1, RANTES, IL-1α, IL-6, and CXCL-16, were significantly reduced, demonstrating an anti-inflammatory property of sesame oil. Gene array analysis showed that sesame oil induced many genes, including ABCA1, ABCA2, APOE, LCAT, and CYP7A1, which are involved in cholesterol metabolism and reverse cholesterol transport. In conclusion, our studies suggest that a sesame oil-enriched diet could be an effective nonpharmacological treatment for atherosclerosis by controlling inflammation and regulating lipid metabolism.
Assuntos
Aterosclerose/dietoterapia , Colesterol na Dieta/metabolismo , Dieta Aterogênica , Inflamação/tratamento farmacológico , Metabolismo dos Lipídeos/efeitos dos fármacos , Óleo de Gergelim/uso terapêutico , Sesamum/química , Animais , Anti-Inflamatórios/farmacologia , Anti-Inflamatórios/uso terapêutico , Aterosclerose/sangue , Transporte Biológico , Colesterol/sangue , LDL-Colesterol/sangue , Citocinas/sangue , Feminino , Regulação da Expressão Gênica/efeitos dos fármacos , Inflamação/sangue , Fígado/metabolismo , Camundongos Knockout , Fitoterapia , Receptores de LDL/metabolismo , Óleo de Gergelim/farmacologia , Triglicerídeos/sangueRESUMO
BACKGROUND & AIMS: Anthocyanins may have beneficial effects on lipid metabolism and inflammation and are demonstrated to have hepatoprotective properties in models of restraint-stress- and chemically-induced liver damage. However, their potential to protect against non-alcoholic steatohepatitis (NASH) under conditions relevant for human pathogenesis remains unclear. Therefore, we studied the effects of the standardised anthocyanin-rich extract Mirtoselect on diet-induced NASH in a translational model of disease. METHODS: ApoE(∗)3Leiden mice were fed a Western-type cholesterol-containing diet without (HC) or with 0.1% (w/w) Mirtoselect (HCM) for 20weeks to study the effects on diet-induced NASH. RESULTS: Mirtoselect attenuated HC-induced hepatic steatosis, as observed by decreased macro- and microvesicular hepatocellular lipid accumulation and reduced hepatic cholesteryl ester content. This anti-steatotic effect was accompanied by local anti-inflammatory effects in liver, as demonstrated by reduced inflammatory cell clusters and reduced neutrophil infiltration in HCM. On a molecular level, HC diet significantly induced hepatic expression of pro-inflammatory genes Tnf, Emr1, Ccl2, Mpo, Cxcl1, and Cxcl2 while this induction was less pronounced or significantly decreased in HCM. A similar quenching effect was observed for HC-induced pro-fibrotic genes, Acta2 and Col1a1 and this anti-fibrotic effect of Mirtoselect was confirmed histologically. Many of the pro-inflammatory and pro-fibrotic parameters positively correlated with intrahepatic free cholesterol levels. Mirtoselect significantly reduced accumulation and crystallisation of intrahepatic free cholesterol, providing a possible mechanism for the observed hepatoprotective effects. CONCLUSIONS: Mirtoselect attenuates development of NASH, reducing hepatic lipid accumulation, inflammation and fibrosis, possibly mediated by local anti-inflammatory effects associated with reduced accumulation and crystallisation of intrahepatic free cholesterol.
Assuntos
Antocianinas/farmacologia , Cirrose Hepática/prevenção & controle , Hepatopatia Gordurosa não Alcoólica , Vaccinium myrtillus/química , Actinas/metabolismo , Animais , Anti-Infecciosos/farmacologia , Proteínas de Ligação ao Cálcio , Quimiocina CXCL1/metabolismo , Ésteres do Colesterol/metabolismo , Colesterol na Dieta/metabolismo , Colágeno Tipo I/metabolismo , Cadeia alfa 1 do Colágeno Tipo I , Citoproteção , Dieta Ocidental , Humanos , Inflamação/tratamento farmacológico , Inflamação/metabolismo , Fígado/metabolismo , Fígado/patologia , Cirrose Hepática/etiologia , Cirrose Hepática/fisiopatologia , Camundongos , Hepatopatia Gordurosa não Alcoólica/complicações , Hepatopatia Gordurosa não Alcoólica/tratamento farmacológico , Hepatopatia Gordurosa não Alcoólica/fisiopatologia , Extratos Vegetais , Receptores de Superfície Celular/metabolismo , Receptores Acoplados a Proteínas G , Resultado do TratamentoRESUMO
High-density lipoproteins (HDLs) are atheroprotective because of their role in reverse cholesterol transport. The intestine is involved in this process because it synthesizes HDL, removes cholesterol from plasma and excretes it into the lumen. We investigated the role of selected dietary fatty acids on intestinal cholesterol uptake and HDL functionality. Caco-2 monolayers grown on Transwells were supplemented with either palmitic, palmitoleic, oleic, linoleic, docosahexaenoic, eicosapentaenoic, arachidonic or conjugated linoleic acids (CLAs): c9,t11-CLA; t9,t11-CLA; c10,t12-CLA. Cells synthesized HDL in the basolateral compartment for 24 h in the absence or presence of an antibody to SR-BI (aSR-BI), which inhibits its interaction with HDL. Free cholesterol (FC) accumulated to a greater extent in the presence than in the absence of aSR-BI, indicating net uptake of FC by SR-BI. Uptake's efficiency was significantly decreased when cells were treated with c9,t11-CLA relative to the other fatty acids. These differences were associated with lower HDL functionality, since neither SR-BI protein expression nor expression and alternative splicing of other genes involved lipid metabolism were affected. Only INSIG2 expression was decreased, with no increase of its target genes. Increasing pre-ß-HDL synthesis, by inducing ABCA1 and adding APOA1, resulted in reduced uptake of FC by SR-BI after c9,t11-CLA treatment, indicating reduced functionality of pre-ß-HDL. Conversely, treatment with c9,t11-CLA resulted in a greater uptake of FC and esterified cholesterol from mature HDL. Therefore, Caco-2 monolayers administered c9,t11-CLA produced a nonfunctional pre-ß-HDL but took up cholesterol more efficiently via SR-BI from mature HDL.
Assuntos
Colesterol na Dieta/metabolismo , HDL-Colesterol/metabolismo , Enterócitos/metabolismo , Circulação Êntero-Hepática , Absorção Intestinal , Ácidos Linoleicos Conjugados/metabolismo , Lipoproteínas HDL/metabolismo , Processamento Alternativo , Transporte Biológico , Antígenos CD36/antagonistas & inibidores , Antígenos CD36/genética , Antígenos CD36/metabolismo , Células CACO-2 , Polaridade Celular , Ésteres do Colesterol/metabolismo , HDL-Colesterol/sangue , Enterócitos/citologia , Regulação da Expressão Gênica , Lipoproteínas de Alta Densidade Pré-beta/genética , Lipoproteínas de Alta Densidade Pré-beta/metabolismo , Humanos , Peptídeos e Proteínas de Sinalização Intracelular/antagonistas & inibidores , Peptídeos e Proteínas de Sinalização Intracelular/genética , Peptídeos e Proteínas de Sinalização Intracelular/metabolismo , Cinética , Lipoproteínas HDL/sangue , Proteínas de Membrana/antagonistas & inibidores , Proteínas de Membrana/genética , Proteínas de Membrana/metabolismo , EstereoisomerismoRESUMO
PURPOSE: The aqueous enzymatic extract from rice bran (AEERB) was rich in protein, γ-oryzanol and tocols. The aim of this study was to investigate the effects of AEERB on the regulation of lipid metabolism and the inhibition of oxidative damage. METHODS: The antioxidant activity of AEERB in vitro was measured in terms of radical scavenging capacity, ferric reducing ability power (FRAP) and linoleic acid emulsion system-ferric thiocyanate method (FTC). Male Wistar rats were fed with a normal diet and a high-fat and high-cholesterol diet with or without AEERB. After treatment, biochemical assays of serum, liver and feces lipid levels, the antioxidant enzyme activity, malondialdehyde (MDA) and protein carbonyl were determined. RESULT: AEERB is completely soluble in water and rich in hydrophilic and lipophilic functional ingredients. AEERB scavenged DPPH⢠and ABTSâ¢+ and exhibited antioxidant activity slightly lower than that of ascorbic acid in the linoleic acid system. The administration of AEERB reduced serum lipid levels and the atherogenic index compared with those of the hyperlipidemic diet group (HD). The administration of AEERB significantly lowered liver lipid levels, inhibited hepatic 3-hydroxyl-3-methylglutaryl CoA reductase activity, and efficiently promoted the fecal excretion of total lipids and total cholesterol (TC) (p < 0.05). Dietary AEERB enhanced antioxidant status in the serum, liver and brain by increasing the antioxidant enzyme activity of superoxide dismutase (SOD), catalase (CAT), and glutathione peroxidase (GSH-Px) and decreasing the content of MDA and protein carbonyl. CONCLUSIONS: The results indicated that AEERB might act as a potent hypolipidemic and antioxidant functional food.
Assuntos
Antioxidantes/uso terapêutico , Colesterol na Dieta/administração & dosagem , Hiperlipidemias/dietoterapia , Hipolipemiantes/uso terapêutico , Metabolismo dos Lipídeos/efeitos dos fármacos , Oryza/química , Estresse Oxidativo/efeitos dos fármacos , Animais , Antioxidantes/metabolismo , Antioxidantes/farmacologia , Benzotiazóis/metabolismo , Compostos de Bifenilo/metabolismo , Colesterol na Dieta/metabolismo , Dieta Hiperlipídica/efeitos adversos , Hiperlipidemias/sangue , Hipolipemiantes/farmacologia , Fígado/efeitos dos fármacos , Fígado/metabolismo , Masculino , Malondialdeído/sangue , Fenilpropionatos/farmacologia , Fenilpropionatos/uso terapêutico , Picratos/metabolismo , Extratos Vegetais/farmacologia , Extratos Vegetais/uso terapêutico , Carbonilação Proteica/efeitos dos fármacos , Ratos Wistar , Sementes , Ácidos Sulfônicos/metabolismoRESUMO
This study was conducted to evaluate the effects of cholesterol on growth and cholesterol metabolism of rainbow trout (Oncorhynchus mykiss) fed diets with cottonseed meal (CSM) or rapeseed meal (RSM). Four experimental diets were formulated to contain 550 g kg(-1) CSM or 450 g kg(-1) RSM with or without 9 g kg(-1) supplemental cholesterol. Growth rate and feed utilization efficiency of fish fed diets with 450 g kg(-1) RSM were inferior to fish fed diets with 550 g kg(-1) CSM regardless of cholesterol level. Dietary cholesterol supplementation increased the growth rate of fish fed diets with RSM, and growth rate and feed utilization efficiency of fish fed diets with CSM. Similarly, dietary cholesterol supplementation increased the plasma total cholesterol (TC), high-density lipoprotein cholesterol, low-density lipoprotein cholesterol, and triiodothyronine levels, but decreased the plasma triglycerides and cortisol levels of fish fed diets with RSM or CSM. In addition, supplemental cholesterol increased the free cholesterol and TC levels in intestinal contents, but decreased the hepatic 3-hydroxy-3-methyl-glutaryl-CoA reductase activity of fish fed diets with RSM or CSM. These results indicate that 9 g kg(-1) cholesterol supplementation seems to improve the growth of rainbow trout fed diets with CSM or RSM, and the growth-promoting action may be related to the alleviation of the negative effects caused by antinutritional factors and/or make up for the deficiency of endogenous cholesterol in rainbow trout.
Assuntos
Ração Animal/análise , Brassica rapa/química , Óleo de Sementes de Algodão/química , Dieta/veterinária , Oncorhynchus mykiss/metabolismo , Fenômenos Fisiológicos da Nutrição Animal , Animais , Cálcio/sangue , Colesterol/sangue , Colesterol/metabolismo , Colesterol/farmacologia , Colesterol 7-alfa-Hidroxilase/genética , Colesterol 7-alfa-Hidroxilase/metabolismo , Colesterol na Dieta/metabolismo , Hidrocortisona/sangue , Mucosa Intestinal/metabolismo , Fígado/enzimologia , Fígado/metabolismo , Músculo Esquelético/metabolismo , Oncorhynchus mykiss/sangue , Fósforo/metabolismo , Tiroxina/sangue , Tri-Iodotironina/sangueRESUMO
Dietary lutein intake is postulated to interfere with the development of age-related macular degeneration (AMD). Because egg yolk-derived lutein has a high bioavailability, long-term consumption of lutein-enriched eggs might be effective in preventing AMD development, but alternatively might increase cardiovascular disease risk. Here, we report the effect of 1-y daily consumption of a buttermilk drink containing 1.5 lutein-rich egg yolks on serum lipid and lipoprotein and plasma lutein concentrations. Additionally, subgroups that could potentially benefit the most from the intervention were identified. Men and women who had early signs of AMD in at least 1 eye, but were otherwise healthy, participated in a 1-y randomized, placebo-controlled parallel intervention trial. At the start of the study, 101 participants were included: 52 in the experimental (Egg) group and 49 in the control (Con) group. Final analyses were performed with 45 participants in the Egg group and 43 participants in the Con group. As expected, the increase in plasma lutein concentrations in the Egg group was 83% higher than that in the Con group (P < 0.001). Changes in serum total, HDL, and LDL cholesterol, as well as the ratio of total cholesterol to HDL cholesterol, were not different between the 2 groups. Interestingly, participants classified as cholesterol absorbers had higher serum HDL cholesterol concentrations than participants classified as cholesterol synthesizers or participants with average campesterol-to-lathosterol ratios (P < 0.05) at baseline. In addition, cholesterol absorbers had a 229% higher increase in plasma lutein concentrations than participants who were classified as having an average campesterol-to-lathosterol ratio upon consumption of the lutein-enriched egg yolk drink (P < 0.05). Moreover, the change in serum HDL cholesterol upon consumption was significantly different between these 3 groups (P < 0.05). We suggest that cholesterol absorbers particularly might benefit from the lutein-enriched buttermilk drink. This study was registered at clinicaltrials.gov as NCT00902408.