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Two types of deposits, hyaline droplets and eosinophilic bodies, associated with α2u-globulin accumulation in the rat kidney.
Journal of Toxicologic Pathology 2017 October
Alpha2u-globulin is an adult male rat-specific protein that accumulates spontaneously or inductively in the renal proximal tubular epithelium and forms microscopically observable deposits, which are generally referred to as "hyaline droplets," whereas a specific type of deposits is referred to as "eosinophilic bodies" by Japanese toxicologic pathologists. We compared hyaline droplets and eosinophilic bodies using special stains including immunostaining for α2u-globulin and lysosome-associated membrane protein in spontaneously occurring and d-limonene-induced cases. Eosinophilic bodies appeared simultaneously and increased in parallel with the hyaline droplets in the induced case. In both of the spontaneous and induced cases, hyaline droplets and eosinophilic bodies were associated with α2u-globulin and lysosomes, although there were differences in the forms and staining properties that probably reflected the purity or density of α2u-globulin. According to the results, it is not necessary for eosinophilic bodies to be strictly distinguished from hyaline droplets, and it is reasonable to identify eosinophilic bodies as hyaline droplets in α2u-globulin nephropathy in routine toxicity studies, as they have been recognized to be a sequence of changes associated with accumulation of α2u-globulin.
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