Yellow fat disease was induced in young rats given a vitamin E-deficient diet supplemented with 15% fish oil. The changes in adipose tissue of this oil-induced disorder were different from those of natural yellow fat disease in horse, pig and mink. In the natural disease all fat depots had the early stage of yellow fat disease with interstitial lipofuscin-laden macrophages exclusively. In the rat, however, this change was seen only in the subcutaneous fat depot. Moreover, affected adipose tissue of animals with natural disease had extensive fibrosis, but in the rat fibrosis was always absent.
Rats with fish oil-induced yellow fat disease had degenerative changes in various fat depots that occurred at various times but in the horse, pig and mink fat depots were affected simultaneously. Lipofuscin accumulated in the reticuloendothelial system in rats. Accumulation in spleen and liver was dependent on vitamin E deficiency, but only the accumulation in the Kupffer cells was correlated with yellow fat disease.
Lipofuscin accumulation in the mesenteric lymph node did not depend on vitamin E deficiency.
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