Summary
The nature of Cuprolinic Blue-positive anionic filaments in mouse lung alveoli has been characterized. The contrast of filaments in the alveolar basement membrane of type I epithelial cells was lost on treatment with nitrous acid and pronase (without prefixation). In contrast, neither neuraminidase, chondroitinase ABC or AC, norStreptomyces hyaluronidase had any effect. Treatment with pronase (after prefixation) and 2.0m MgCl2 (after prefixation) also had no effect, indicating that the filaments are heparan sulphate proteoglycans. The filaments in the alveolar basement membrane of type II epithelial cells and in the capillary basement membrane of the endothelial cells were also nitrous acid sensitive, but chondroitinase ABC-insensitive. A model in which the whole alveolus contains a single layer of heparan sulphate-containing proteoglycan monomers is proposed. Furthermore, the collagen fibril associated filaments remained unaffected after treatment with nitrous acid, neuraminidase orStreptomyces hyaluronidase, or after digestion with pronase (after prefixation) and treatment with 2.0m MgCl2 (after prefixation). These filaments, however, could no longer be detected when digestion with chondroitinase ABC or pronase (without prefixation) was applied; chondroitinase AC treatment clearly affected the filaments, although they still were visible. These results indicate that the filaments are dermatan sulphate-containing proteoglycans. Some functional aspects of the proteoglycans are discussed.
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Van Kuppevelt, T.H.M.S.M., Cremers, F.P.M., Domen, J.G.W. et al. Staining of proteoglycans in mouse lung alveoli. II. Characterization of the Cuprolinic Blue-positive, anionic sites. Histochem J 16, 671–686 (1984). https://doi.org/10.1007/BF01003394
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DOI: https://doi.org/10.1007/BF01003394