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• W2079257060 abstract "Electron microscopic immunostaining was used to examine the localization of type IV collagen, laminin, entactin , heparan sulfate proteoglycan, and fibronectin within the basement membranes of the rat kidney. In preliminary experiments, various methods of processing formaldehyde-fixed kidney were compared using antilaminin antiserum and the indirect immunoperoxidase method. Little or no laminin immunostaining of the glomerular basement membrane was present in sections unless they had been frozen-thawed; and even in this case, the immunostaining was light in comparison to that of basement membranes in adjacent tubules. However, when frozen-thawed sections were treated with 0.5% sodium borohydride, immunostaining was then as strong in glomerular as in tubular basement membranes. Accordingly, this treatment was applied to frozen-thawed sections before immunostaining for any of the substances under study. Immunostaining of the glomerular basement membrane for each of the five substances was fairly uniform throughout the lamina densa (also called basal lamina), but uneven in the lamina lucida interna and externa (also called lamina rara interna and externa) in which stained bands extended from the lamina densa. Similarly in the basement membranes of tubules, immunostaining for the five substances was localized to the lamina densa and bands extending into the lamina lucida. When the ultrastructure of the glomerular basement membrane was examined, three structures were found: (1) a network of 4-nm-thick cords, which seems to be the main component; the cords are closely packed in the lamina densa and more loosely arranged in the lamina lucida interna and externa; (2) straight, hollow 7-10-nm-thick structures referred to as basotubules ; and (3) 3.5-nm elements composed of minute paired rods, referred to as double pegs. The distribution of the cords, but not that of the other two structures, was related to the immunostaining pattern. It is concluded that (1) to fully reveal the antigenicity of the glomerular basement membrane, frozen-thawed sections must be treated with sodium borohydride prior to immunostaining, possibly because this basement membrane is more compact than the others; and (2) in both glomerular and tubular basement membranes, type IV collagen, laminin, entactin , heparan sulfate proteoglycan and fibronectin are colocalized in the lamina densa and its extensions to the laminae lucidae . Since the distribution of the cords corresponds to that of immunostaining, it is likely that the five substances are present within the cords." @default.
• W2079257060 created "2016-06-24" @default.
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• W2079257060 date "1984-04-01" @default.
• W2079257060 modified "2023-10-15" @default.
• W2079257060 title "Fine structure of the glomerular basement membrane and immunolocalization of five basement membrane components to the lamina densa (basal lamina) and its extensions in both glomeruli and tubules of the rat kidney" @default.
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• W2079257060 doi "https://doi.org/10.1002/aja.1001690408" @default.
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