Summary
This study describes the distribution of heparan sulfate proteoglycan (HSPG) within the rat aorta using immunocytochemical (biotin-avidin-peroxidase) and immunoelectron microscopy (125I-autoradiography). Heparan sulfate proteoglycan was isolated from a basement membrane producing mouse EHS sarcoma (Hassell et al. 1980) and used to generate antisera in rabbits. Light microscopic observations revealed intense immunostaining of the intima and media of normal aorta, adventitial vasa vasorum, and aortic intimal fibromuscular thickenings induced by experimental injury (balloon de-endothelialization). Immunoelectron microscopy using 125I labeled antibodies to HSPG revealed that proteoheparan sulfate was localized to the amorphous layer of basement membrane below aortic and capillary endothelium. In addition, labeled anti-HSPG could be localized to the external lamina surrounding the smooth muscle cells in the hyperplastic intima. These studies reveal that antibodies prepared against a proteoheparan sulfate isolated from a basement membrane producting EHS sarcoma cross react with basement membrane structures within the aortic wall. Furthermore, these results demonstrate that the basement membranes beneath aortic and capillary endothelium and the external lamina surrounding aortic smooth muscle cells contain a heparan sulfate proteoglycan that is antigenically similar.
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Clowes, A.W., Clowes, M.M., Gown, A.M. et al. Localization of proteoheparan sulfate in rat aorta. Histochemistry 80, 379–384 (1984). https://doi.org/10.1007/BF00495421
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DOI: https://doi.org/10.1007/BF00495421