Light and electron microscopic detection of lectin binding sites in normal and disordered human gastric tissues.

Lectins are now widely used as histochemical markers and probes for carbohydrate structures in glycoproteins. In the present study, a method is described for the light and electron microscopic detection of Ulex europaeus agglutinin I binding sites in the normal and neoplastic tissues. The results showed that the gastric mucus-producing cells and some vascular endothelial cells could be strongly stained with labelled lectin in normal mucous membrane. The positive staining reactivity was reduced greatly in neoplastic tissue either in paraffin sections or in thin sections. This suggested that the secretions of gastric carcinoma are different from those of normal gastric mucosa and represent differentiation of neoplastic cells to some degree.