Immunohistochemical properties in the patients with Buergerʹs disease—possible role of plasminogen activator inhibitor-1 for preservation of vessel wall architecture

Background chitecture of the arterial wall affected with Buergerʹs disease has been known to be preserved in all three layers, while the one affected by arteriosclerosis obliterans (ASO) is degenerated and destroyed. We analyzed affected arteries with immunohistochemical methods to clarify the differences between Buergerʹs disease and ASO. als and methods arteries obtained from 13 patients with Buergerʹs disease and 6 patients with ASO at our institute were studied. In addition, we examined seven specimens from six patients who were thought to be normal (without Buergerʹs disease or ASO) as negative control. Immunohistochemical studies were performed on paraffin-embedded tissues. The primary antibodies were urokinase-type plasminogen activator (uPA) and matrix metalloproteinase-3 (MMP-3). Both are known to play an important role of extracellular proteolysis and to activate each other. Additionally, plasminogen activator inhibitor-1(PAI-1) was also examined. s rgerʹs disease, PAI-1 was well expressed along the internal elastic lamina. Urokinase-type plasminogen activator and MMP-3 were slightly positive in intima and media. In ASO, a slight amount of PAI-1 was recognized on vessel walls, and both uPA and MMP-3 were strongly positive in media. In addition, in the control group, PAI-1, uPA, and MMP-3 were well expressed in media. sion rgerʹs disease, PAI-1 was strongly expressed around the internal elastic lamina, while both uPA and MMP-3 were slightly recognized on vessel walls. These findings could be one of the reasons the general architecture of vessel walls in Buergerʹs disease is preserved.