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. 1981 Dec;44(4):799–810.

Goblet cell glycoprotein: an organ-specific antigen for gut. Isolation, tissue localization and immune response.

J K Roche, S L Cook, E D Day
PMCID: PMC1554995  PMID: 6172374

Abstract

We report, for the first time, immune responses within two lines of inbred rats to a purified Lewis rat glycoprotein antigen which is organ-specific for intestine. The antigen was prepared by solubilization of gut epithelial cell-associated macromolecules, fractionation in ethanol, and molecular sieve chromatography over Sepharose 2B. Homogeneity of the end product (RGCG-PK1) was supported by results of both double diffusion in agar and SDS polyacrylamide gel electrophoresis. Amino acid analysis and specific sugar determination proved that RGCG-PK1 was not a classical mucin because of its comparatively high tyrosine and low galactosamine + glucosamine content, and the absence of glycosidic linkages to serine and threonine. Organ-specificity was shown by the ability of RGCG (but not liver homogenate) to inhibit precipitation and haemagglutination by heterologous specific sera. Organ-specificity was confirmed by the demonstration of RGCG-PK1-specific immunofluorescence staining of rat small and large intestine, but not esophagus, stomach or liver. RGCG-PK1 determinants within rat and human small bowel were found to be confined to goblet cells and intestinal glycocalyx. Anti-RCGC-PK1 serum showed no reactivity with highly purified xenogeneic mucins nor with syngeneic small bowel mucin. Specific antibody (as well as antibody-dependent cellular cytotoxicity) to RGCG was elicited and detected for up to 10 days in two lines of inbred rats, including the one (Lewis) from which the antigen was isolated. The duration and peak of the humoral immune response were abbreviated compared with that of a xenogeneic control glycoprotein studied in parallel, probably due to immunoregulatory mechanisms operative for self antigens.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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