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Effects of trans-10, cis-12 conjugated linoleic acid on body fat and serum lipids in young and adult hamsters

Efectos del isómero trans-10,cis-12 del ácido linoleico conjugado en la grasa y los lipidos séricos en hamsteres jóvenes y adultos

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Abstract

The aim of the present work was to determine whether t-10, c-12 conjugated linoleic acid (CLA) feeding was able to reduce body fat accumulation and improve the serum lipid profile in adult hamsters fed an atherogenic diet, in order to compare these effects with those observed in young growing hamsters. Young and adult hamsters were fed semi-purified atherogenic diets supplemented with 0.5% linoleic acid or 0.5% t-10, c-12 CLA for 6 weeks. Body weight and food intake were measured every two days. Adipose tissue from different anatomical locations, liver and gastrocnemious muscle were dissected and weighed. Cholesterol, triacylglycerols, non-esterified fatty acids and proteins were determined spectrophotometrically and water content by gravimetry. In young hamsters, no significant differences were found in food intake, final body weight and gastrocnemious muscle weight. White adipose tissue weights were reduced, liver weight was increased and cholesterol and triacylglycerols in both serum and liver were reduced. In adult hamsters, CLA feeding decreased food intake and adipose tissue weights. No changes were observed in other parameters. The present study demonstrates that age has an influence in hamster responsiveness to t-10, c-12 CLA because, although when this isomer is added to an atherogenic diet it reduces body fat accumulation in both young and adults hamsters, the lessening of the effects on serum lipids brought about by atherogenic feeding is only observed in young animals. Moreover, it is clear that liver is a target for CLA in young but not in adult hamsters.

Resumen

El objetivo del presente estudio fue determinar si el isómero t-10, c-12 del ácido linoleico conjugado (ALC) era capaz de reducir la acumulación de grasa corporal y de mejorar el perfil lipídico en hámsteres adultos alimentados con una dieta aterogénica, con el fin de compararlos con los observados en hámsteres jóvenes en crecimiento. Los animales se alimentaron con dietas aterogénicas suplementadas con 0,5% de ácido linoleico ó 0,5% de ALC t-10, c-12 durante 6 semanas. Se midió cada dos días la ingesta de alimento y el peso corporal. Se diseccionaron y pesaron tejidos adiposos de diferentes localizaciones anatómicas, el hígado y los dos músculos gastrocnemios. El colesterol, los triglicéridos, los ácidos grasos libres y las proteínas se valoraron espectrofotométricamente ricamente y el agua por gravimetría. En los animales jóvenes no se observaron diferencias significativas en la ingesta, el peso corporal final y el peso de los músculos gastrocnemios. Los pesos de los tejidos adiposos blancos se redujeron, el peso de hígado aumentó y el colesterol y los triglicéridos disminuyeron, tanto en suero como en higado. En hámsteres adultos, el ALC disminuyó la ingesta y los pesos de los tejidos adiposos, pero no se observaron cambios en los demás parámetros. El presente estudio demuestra que la edad influye en la respuesta del hámster al ALC t-10, c-12 porque, aunque al ser anadido a una dieta aterogénica reduce la grasa corporal tanto en animales jóvenes como adultos, la atenuación de los efectos de esta dieta sobre los lípidos séricos sólo se pone de manifiesto en los jóvenes. Además, sólo en estos últimos, el hígado es claramente una diana para el ALC.

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Navarro, V., Miranda, J., Churruca, I. et al. Effects of trans-10, cis-12 conjugated linoleic acid on body fat and serum lipids in young and adult hamsters. J. Physiol. Biochem. 62, 81–87 (2006). https://doi.org/10.1007/BF03174069

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  • DOI: https://doi.org/10.1007/BF03174069

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