Feeding soy protein isolate and oils rich in omega-3 polyunsaturated fatty acids affected mineral balance, but not bone in a rat model of autosomal recessive polycystic kidney disease

Abstract

BackgroundPolycystic kidney disease (PKD), a genetic disorder characterized by multiple cysts and renal failure at an early age. In children, kidney disease is often accompanied by disordered mineral metabolism, failure to achieve peak bone mass, and reduced adult height. Optimizing bone health during the growth stage may preserve against bone loss associated with early renal dysfunction in PKD. Dietary soy protein and omega-3 polyunsaturated fatty acid (n-3 PUFA) have been reported to ameliorate PKD and to promote bone health. The study objective was to determine the bone effects of feeding soy protein and/or n-3 PUFAs in a rat model of PKD.MethodsWeanling female PCK rats (n = 12/group) were randomly assigned to casein + corn oil (Casein + CO), casein + soybean oil (Casein + SO), soy protein isolate + soybean oil (SPI + SO) or soy protein isolate + 1:1 soybean oil:salmon oil blend (SPI + SB) for 12 weeks.ResultsRats fed SPI + SO diet had shorter (P = 0.001) femur length than casein-fed rats. Rats fed SPI + SO and SPI + SB diet had higher (P = 0.04) calcium (Ca) and phosphorus (P) retention. However, there were no significant differences in femur and tibial Ca, P or bone mass between diet groups. There were also no significant difference in bone microarchitecture measured by micro-computed tomography or bone strength determined by three-point bending test between diet groups.ConclusionsEarly diet management of PKD using SPI and/or n-3 PUFAs influenced bone longitudinal growth and mineral balance, but neither worsened nor enhanced bone mineralization, microarchitecture or strength.

Застосування Препарату Есенціальних Жирних Кислот «ліпосан-Форте» На Тлі Тривалого Введення Преднізолона Білим Щурам

“…Установлено, что введение в рацион жиров с повышенным содержанием ω-3 полиненасыщенных жирных кислот (ПНЖК) при моделировании глюкокортикоидного остеопороза у лабораторных животных, усиливает абсорбцию кальция в кишечнике и снижает его экскрецию почками, что способствует снижению интенсивности резорбции костей [9,10). Предполагается, что определяющими факторами остеопротекторных свойств жиров, содержащих ω-3 ПНЖК, являются суточная доза потребляемого жира и соотношение в нём ω-6 и ω-3 ПНЖК.…”