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Valenzuela B.R.,Institute of Biomedical science | Gormaz J.G.,Institute of Biomedical science | Masson S.L.,Institute of Biomedical science | Vizcarra M.,Institute of Biomedical science | And 3 more authors.
Grasas y Aceites | Year: 2012

The high dietary intake of n-6 fatty acids in relation to n-3 fatty acids generates health disorders, such as cardiovascular diseases, inflammatory diseases and other chronic diseases. The consumption of fish, which is rich in n-3 fatty acids, is low in Latin America and it is necessary to seek other alternatives, such as chia oil (CO) or rosa mosqueta oil (RMO), which are rich in α-linolenic acid (ALA), the precursor of the n -3 fatty acids, eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA). This study evaluates the hepatic bioconversion of ALA to EPA and DHA and the damage to the liver (histology and transaminase) in Sprague-Dawley rats fed different vegetable oils. Four experimental groups (n = 9 animals each group) were fed the following dietary supplements for 21 days: a) sunflower oil (SFO), b) RMO, c) CO d) olive oil with fish oil added (EPA and DHA) (OO/FO). RMO and CO increased the hepatic levels of ALA, EPA and DHA and decreased the n-6/n-3 ratio compared to SFO (p < 0.05) without changes in the parameters of liver damage. It is concluded that CO and RMO may be nutritional alternatives for providing ALA for its bioconversion to EPA and DHA.

Carrasco-Pozo C.,Institute of Nutrition and Food Technology INTA | Carrasco-Pozo C.,University of Chile | Morales P.,Institute of Nutrition and Food Technology INTA | Morales P.,University of Chile | And 2 more authors.
Journal of Agricultural and Food Chemistry | Year: 2013

The aim of this study was to determine the protective effect of quercetin, epigallocatechingallate, resveratrol, and rutin against the disruption of epithelial integrity induced by indomethacin in Caco-2 cell monolayers. Indomethacin decreased the transepithelial electrical resistance and increased the permeability of the monolayers to fluorescein-dextran. These alterations were abolished by all the tested polyphenols but rutin, with quercetin being the most efficient. The protective effect of quercetin was associated with its capacity to inhibit the redistribution of ZO-1 protein induced in the tight junction by indomethacin or rotenone, a mitochondrial complex-I inhibitor, and to prevent the decrease of ZO-1 and occludin expression induced by indomethacin. The fact that the antioxidant polyphenols assayed in this study differ in their protective capacity against the epithelial damage induced by indomethacin suggests that this damage is due to the ability of this agent to induce not only oxidative stress but also mitochondrial dysfunction. © 2013 American Chemical Society.

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