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- W2079103386 abstract "Choroidal melanocytes and the retinal pigmented epithelium (RPE) were studied morphologically and histochemically in the Smyth chicken, an avian model for human vitiligo. The sequence of cytological events occurring in the ocular tissue of minimally depigmented Smyth birds was determined. Abnormalities of melanocytes and the associated inflammation was least severe in peripheral areas of the choroid and most pronounced in the back of the eye at the base of the optic nerve head. In the peripheral choroid, morphologically normal melanocytes and an occasional mononuclear leukocyte were observed. However, some of these morphologically normal melanocytes histochemically demonstrated atypical tyrosinase activity at the trans area of the Golgi apparatus. Toward the back of the eye, the melanocytes first appeared swollen and had retracting dendrites. Ultrastructurally these melanocytes demonstrated an increase in extramelanosomal cytoplasm. Later, melanocytes became spherical and had membrane bound, autophagosome-like compartments of pigment granules. As the melanocyte injury progressed, macrophages invaded the tissue and phagocytized melanocytic dendrites. These were followed by numerous plasma cells. Eventually, the back of the eye contained no pigment and was infiltrated with numerous mononuclear inflammatory cells. The retinal pigment epithelium also demonstrated a gradient in the degree of destruction, related to its topography. These cytological features consisted of the retraction of apical RPE processes, the disappearance of the basal plasma membrane infoldings, and the replacement of Bruch's membrane by collagen-like fibrils. These results demonstrate that the uveitis which develops in vitiligo appears to be a consequence of an inherent choroidal melanocyte defect." @default.
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- W2079103386 date "1988-03-01" @default.
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- W2079103386 title "Ocular Pathology in the Minimally Depigmented Subline of the Vitiliginous Smyth Chicken" @default.
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- W2079103386 doi "https://doi.org/10.1111/j.1600-0749.1988.tb00125.x" @default.
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