Effect of dietary soy protein and genistein on disease progression in mice with polycystic kidney disease

American Journal of Kidney Diseases : the Official Journal of the National Kidney Foundation
K TomobeB J Holub

Abstract

The effects of feeding a soy protein isolate or genistein, an isoflavonoid present in soy protein, on cyst development were examined in the DBA/2FG-pcy (pcy) mouse, an accepted animal model of polycystic kidney disease, before the appearance of clinical symptoms. In study 1, 60-day-old male pcy mice were evenly divided into two groups and fed semipurified diets, based on casein or a soy protein isolate (15 g protein/100 g diet) for 90 days. In study 2, the animals were fed a casein-based diet (25 g casein/100 g diet) with or without genistein (0.05 g/100 g diet) for 60 days. In study 1, total kidney weight and kidney weight relative to body weight were significantly reduced (by 24% to 25%) in the animals fed the soy protein-based diet, relative to the casein-fed group, as was kidney water content (by 38%). In addition, mean cyst volume, as measured by morphometry, were lower (by 25%) in kidneys from the soy protein-fed group. No differences were found between these two groups with respect to final body weight, plasma creatinine, and protein content; however, plasma urea values were significantly lower in the soy protein-fed animals. Genistein supplementation of a casein-based diet in study 2 did not reduce the renal enlargement...Continue Reading

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