RESUMEN
BACKGROUND: Cholesterol-dependent and independent mechanisms were proposed to explain anti-atherosclerotic action of statins in humans. However, their effects in murine models of atherosclerosis have not been consistently demonstrated. Here, we studied the effects of pravastatin on atherosclerosis in ApoE/LDLR-/- mice fed a control and atherogenic diet. METHODS: ApoE/LDLR-/- mice were fed a control (CHOW) or an atherogenic (Low Carbohydrate High Protein, LCHP) diet. Two doses of pravastatin (40mg/kg and 100mg/kg) were used. The anti-atherosclerotic effects of pravastatin in en face aorta, cross-sections of aortic roots and brachiocephalic artery (BCA) were analysed. The lipid profile was determined. Fourier Transform Infrared Spectroscopy followed by Fuzzy C-Means (FCM) clustering was used for the quantitative assessment of plaque composition. RESULTS: Treatment with pravastatin (100mg/kg) decreased total and LDL cholesterol only in the LCHP group, but displayed a pronounced anti-atherosclerotic effect in BCA and abdominal aorta. The anti-atherosclerotic effect of pravastatin (100mg/kg) in BCA was associated with significant alterations of the chemical plaque composition, including a fall in cholesterol and cholesterol esters contents independently on total cholesterol and LDL concentration in plasma. CONCLUSIONS: Pravastatin at high (100mg/kg), but not low dose displayed a pronounced anti-atherosclerotic effect in ApoE/LDLR-/- mice fed a CHOW or LCHP diet that was remarkable in BCA, visible in en face aorta, whereas it was not observed in aortic roots, suggesting that previous inconsistencies might have been due to the various sites of atherosclerotic plaque analysis.
Asunto(s)
Aorta/efectos de los fármacos , Apolipoproteínas E/deficiencia , Aterosclerosis/tratamiento farmacológico , Tronco Braquiocefálico/efectos de los fármacos , Pravastatina/uso terapéutico , Receptores de LDL/deficiencia , Animales , Anticolesterolemiantes/farmacología , Anticolesterolemiantes/uso terapéutico , Aorta/metabolismo , Aorta/patología , Aterosclerosis/metabolismo , Aterosclerosis/patología , Tronco Braquiocefálico/metabolismo , Tronco Braquiocefálico/patología , Femenino , Ratones , Ratones Noqueados , Pravastatina/farmacología , Resultado del TratamientoRESUMEN
The objective of the study was to determine the effects of pomegranate seed oil, used as a source of punicic acid (CLnA) in the diets of laying hens, on the physicochemical properties of eggs. Forty Isa Brown laying hens (26weeks old) were equally subjected to 4 dietary treatments (n=10) and fed a commercial layer diet supplying 2.5% sunflower oil (control) or three levels (0.5, 1.0 and 1.5%) of punicic acid in the diets. After 12weeks of feeding the hens, eggs collection began. Sixty eggs - randomly selected from each group - were analysed for physicochemical properties. Eggs naturally enriched with CLnA preserve their composition and conventional properties in most of the analysed parameters (including chemical composition, physical as well as organoleptic properties). Dietary CLnA had positive impact on the colour of the eggs' yolk, whereas the hardness of hard-boiled egg yolks was not affected. Additionally, increasing dietary CLnA led to an increase not only the CLnA concentrations, but also CLA in egg-yolk lipids.