Summary
Several connective tissues were stained for proteoglycans using the cationic dye Cuprolinic Blue according to the critical electrolyte concentration method. With this method, proteoglycans are visualized as electron-dense filaments. In most tissues, two types of proteoglycan filaments are present: a small (maximum length 60 nm), thin, collagen fibril-associated filament, and a thick, heavily-staining filament which is predominantly localized between bundles of collagen fibrils. Cartilage contains very large (about 300 nm) proteoglycan filaments while in cornea they are very small. Comparison with biochemical data from the literature suggests that the appearance of the proteoglycan filaments may be indicative for the glycosaminoglycan—protein ratio and for the molecular weight of the part of the protein core to which glycosaminoglycans are attached. The data thus obtained on the localization and structure of a proteoglycan may be useful when planning a strategy for its isolation.
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Van Kuppevelt, T.H.M.S.M., Rutten, T.L.M. & Kuyper, C.M.A. Ultrastructural localization of proteoglycans in tissue using Cuprolinic Blue according to the critical electrolyte concentration method: Comparison with biochemical data from the literature. Histochem J 19, 520–526 (1987). https://doi.org/10.1007/BF01675423
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DOI: https://doi.org/10.1007/BF01675423