Enzyme Histochemistry of Aorta

The histochemical activities of dehydroenases, alk- and acid-p-ase, esterases, β-glucuronidase, phosphorylase and leucine aminopeptidase in the human and rabbit aortae were observed. The endothelium covering the innermost surface, fibroblastic cells and muscle cells in every layers, and wandering cells showed the various enzyme activities. These activities resembled those of rest cells in subcutaneous tissues and much weaker than those of sensitized cells. In addition, the findings in atherosclerotic tissues and experimental animals were reported.