Summary
The distribution of hyaluronic acid and proteoglycans in bovine thoracic aorta was studied by Alcian Blue staining of frozen tissue sections under controlled electrolyte conditions with and without prior enzymic digestion. Some sections were digested with chondroitinase ABC, testicular hyaluronidase or bacterial collagenase and subsequent staining permitted conclusions to be drawn about the distribution of specific glycosaminoglycans within the tissue. The total glycosaminoglycan content was maximal in the intima and decreased across the arterial wall to the outermost adventitial layer. The content of proteoglycan containing chondroitin sulphate and/or dermatan sulphate chains paralleled this distribution. However, other glycosaminoglycans also contributed significantly to staining, although there was no evidence for any appreciable concentration of heparin or highly sulphated heparan sulphate.
Several experiments indicated that proteoglycan containing chondroitin sulphate and/or dermatan sulphate was associated with elastic laminae which were often seen stained along their periphery. Hyaluronic acid was present at significant concentrations in all locations of the aorta and there was evidence for a similar distribution of heparan sulphate which was possibly also present at a high concentration in the endothelium. Staining of sections after treatment with 4m guanidinium chloride confirmed that this extractant removed most of the proteoglycan from the tissue section.
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Bartholomew, J.S., Anderson, J.C. Distribution of proteoglycans and hyaluronic acid in transverse sections of bovine thoracic aorta. Histochem J 15, 941–951 (1983). https://doi.org/10.1007/BF01002490
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DOI: https://doi.org/10.1007/BF01002490