We have examined the reactivity of monoclonal antibodies (MAbs) specific for Lewis antigens (Le(x), Le(y), Le(a), and Le(b)) with Helicobacter pylori lipopolysaccharides (LPS) by immunoblot analysis and enzyme-linked immunosorbent assay (ELISA). Sixty-eight strains of H. pylori were isolated from patients with chronic gastritis, gastric and duodenal ulcers, and gastric cancer in Japan. The cell...

Comparisons of carbohydrate profiles between control and apoptotic colon carcinoma cells were performed by flow cytometry using a set of lectins and anti-carbohydrate antibodies. The six cell lines analyzed presented distinct carbohydrate profiles before induction of apoptosis. PHA-L and MAA binding decreased after induction of apoptosis by UV-treatment. In contrast an increase of PNA binding w...

BACKGROUND In normal gastric epithelium, MUC5AC is detected in superficial epithelium associated with Lewis type 1 antigens and MUC6 is detected in antral glands with Lewis type 2. Therefore, the stomach constitutes an excellent model to examine the role of glycosyltransferases in determining the specificity of apomucin glycosylation. AIMS To determine the molecular basis of this association ...

In order to evaluate the importance of an extracellular matrix on mucin secretion, human bronchial epithelial cells were cultured for 3 weeks on either plastic or type I collagen. By metabolically labeling cells with tritiated glucosamine, we found that cells grown on collagen secreted more radiolabeled mucins than cells grown on plastic, and their amount increased from week 1 to week 3 in both...

A new rat asthma model was devised, and with the model, allergic bronchoconstrictor responses and effects of disodium cromoglycate (DSCG) were compared among Wistar, Lewis and Fischer 344 rats. Rats were actively sensitized with DNP-Ascaris antigen (DNP-As) and killed Bordetella pertussis vaccine. After eight days, asthmatic response was provoked by inhalation of DNP-As. The bronchomotor respon...

A library of glycosylated porphyrins (glycoporphyrins) was prepared and the compounds were evaluated for their photodynamic therapy (PDT) activity against the oesophageal squamous-cell carcinoma cell line OE21 in vitro. A synthetic methodology was developed to allow incorporation of biologically active carbohydrates, including the histo-blood-group antigen trisaccharide Lewis(X), onto the porph...

Four monoclonal antibodies produced by hybridomas obtained from a mouse immunized with a human adenocarcinoma cell line SW1116 (Koprowski, H., Steplewski, Z., Mitchell, K., Herlyn, M., Herlyn, D., and Fuhrer, P. (1979) Somatic Cell Genet. 5, 957-972) are directed against the Leb antigen of the human Lewis blood group system. Their specificities were established by binding studies using purified...

A prospective study with two gastric biopsies taken several years apart was carried out in 1 1 7 subjects with intestinal metaplasia who are of the Lewis(a-b+) phenotype. They are residents of a rural Andean region in Colombia displaying very high rates of gastric cancer. The anamalous expression of Lewisa antigens in the metaplastic epithelium carried a significantly increased risk of colonic ...

This article summarizes the main findings concerning Helicobacter pylori associated with gastric MALT lymphoma (GML). Considered together, GML strains based on their virulence factor profile appear to be less virulent than those associated with peptic ulcers or gastric adenocarcinoma. A particular Lewis antigen profile has been identified in GML strains and could represent an alternative adapti...