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• W2045164564 abstract "Endothelin-1 (ET-1) is a vasoconstrictor peptide which is produced by endothelial cells. The subcellular distribution of ET-1 in human skin and the variation of immunostaining for ET-1 by light microscopy in skin biopsies of diabetic patients have been analysed using immunohistochemistry and image analysis quantification. Skin biopsies were collected from 17 patients with type 1 diabetes of different durations and with presence or absence of microangiopathy in the retina; skin biopsies of healthy subjects were utilized as controls. The distribution of ET-1 immunoreactivity (IR) at both light and electron microscopy was compared to that of von Willebrand factor (vWf), a general marker of total cutaneous microvessels. Immunohistochemistry revealed that in controls the distribution of immunostaining was similar for ET-1 and vWf, being localized to microvessels in all areas of the skin. However, at the electron microscopical level ET-1-IR was localized in the endothelial cytoplasm rather than in specific organelles, while vWf immunostaining was associated with Weibel-Palade bodies. ET-1-IR was observed in 4/8 (50 per cent) biopsies from healthy subjects; this increased to 81.8 per cent in biopsies of patients affected by diabetes for less than 10 years and decreased to 16.6 per cent in patients with diabetes for more than 10 years. Quantification of ET-1 staining showed a significant decrease of ET-1-IR in patients affected by diabetes for more than 10 years compared with those affected by diabetes for less than 10 years (P<0.05). Also, the percentage of biopsies showing positive ET-1 staining was lower in patients with retinopathy than in patients without retinopathy. On the contrary, vWf-IR was observed in all skin specimens and its quantification showed no differences between diabetic patients and controls. These changes are not related to variations in the number of blood vessels, and it is suggested that they reflect a possible functional alteration of the endothelial cells during diabetes." @default.
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• W2045164564 date "1995-02-01" @default.
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• W2045164564 title "Early increase precedes a depletion of endothelin-1 but not of von Willebrand factor in cutaneous microvessels of diabetic patients. A quantitative immunohistochemical study" @default.
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• W2045164564 doi "https://doi.org/10.1002/path.1711750213" @default.
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