AN ULTRASTRUCTURAL ANALYSIS OF ENDOTHELIAL CHANGE PARALLELING PLATELET-AGGREGATION IN A LIGHT DYE MODEL OF MICROVASCULAR INSULT

  • 1 January 1983
    • journal article
    • research article
    • Vol. 110  (2) , 148-160
Abstract
Those microvascular endothelial events that parallel the evolution of platelet aggregation were evaluated in a well-controlled animal model. Cat pial microvessels were observed through a cranial window, while local platelet aggregation was produced by i.v. injection of sodium fluorescein and simultaneous exposure of the pial vessels to light from a filtered Hg lamp that excited the fluorescein. The vessels were fixed in situ when the in vivo observations of a preselected vessel indicated early, intermediate or advanced aggregation in that vessel. The preselected vessel was then harvested for ultrastructural study together with adjacent vessels from the illuminated field. These vessels and appropriate controls were compared in semiserial thin sections. The onset of platelet aggregation in both venules and arterioles was accompanied by focal endothelial lucency, vacuole formation, luminal membrane rupture and swelling of the nuclear envelope. These changes were not found in control material. With intermediate aggregation these changes were more common, while with advanced aggregation these abnormalities occurred together with focal endothelial denudation. In this model, denudation occurred only with advanced aggregation and was not a prerequisite for aggregation.