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Ultrastructural localization of acidic glycoconjugates with the low iron diamine method

M Takagi, RT Parmley, SS Spicer, FR Denys and ME Setser

The present study has applied the low iron diamine (LID) method at the ultrastructural level to demonstrate acid glycoconjugates. We have examined rat epiphyseal cartilage, human bone marrow, rat tracheal glands, and mouse sublingual glands stained with LID prior to embedment. The LID staining appeared to require postosmication for adequate visualization at the electron microscope level. Thiocarbohydrazide-silver proteinate (TCH-SP) staining of thin sections variably enhanced LID reactive sites. LID-TCH-SP stained carboxyl and sulfate groups of glycosaminoglycans in the extracellular cartilage matrix, secretory granules, and expanded Golgi saccules of chondrocytes. In human bone marrow, LID-TCH-SP variably stained the cytoplasmic granules, known to contain sulfated glycosaminoglycans, and the external surface of the plasma membrane of leukocytes. Moderately strong LID staining was observed in secretory granules in mucous tubules of rat tracheal glands, known to contain sulfated glycoproteins, and in acinar cells of mouse sublingual glands, known to contain a sialoglycoprotein. The lack of sulfated glycoconjugates in acinar cells of the mouse sublingual gland was confirmed by their failure to stain with the high iron diamine method. Thus these studies indicate that the LID and LID-TCH-SP methods are useful for the ultrastructural localization of carboxylated and sulfated glycoconjugates in extracellular and intracellular sites.

Volume 30, Issue 5, pp. 471-476, 05/01/1982
Copyright © 1982 by The Histochemical Society


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