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Sulphation and secretion of the predominant secretory human colonic mucin MUC2 in ulcerative colitis

Open access
Van Klinken, B J-W, Van der Wal, J-W G, Einerhand, A W C, Büller, H A, Dekker, J·1999·Gut

Abstract

BACKGROUND: Decreased synthesis of the predominant secretory human colonic mucin (MUC2) occurs during active ulcerative colitis. AIMS: To study possible alterations in mucin sulphation and mucin secretion, which could be the cause of decreased mucosal protection in ulcerative colitis. METHODS: Colonic biopsy specimens from patients with active ulcerative colitis, ulcerative colitis in remission, and controls were metabolically labelled with [ 35 S]-amino acids or [ 35 S]-sulphate, chase incubated and analysed by SDS-PAGE, followed by quantitation of mature [ 35 S]-labelled MUC2. For quantitation of total MUC2, which includes non-radiolabelled and radiolabelled MUC2, dot blotting was performed, using a MUC2 monoclonal antibody. RESULTS: Between patient groups, no significant differences were found in [ 35 S]-sulphate content of secreted MUC2 or in the secreted percentage of either [ 35 S]-amino acid labelled MUC2 or total MUC2. During active ulcerative colitis, secretion of [ 35 S]-sulphate labelled MUC2 was significantly increased twofold, whereas [ 35 S]-sulphate incorporation into MUC2 was significantly reduced to half. CONCLUSIONS: During active ulcerative colitis, less MUC2 is secreted, because MUC2 synthesis is decreased while the secreted percentage of MUC2 is unaltered. Furthermore, sulphate content of secreted MUC2 is unaltered by a specific compensatory mechanism, because sulphated MUC2 is preferentially secreted while sulphate incorporation into MUC2 is reduced.

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Metadata

Authors
Van Klinken, B. J.-W., Van der Wal, J.-W. G., Einerhand, A. W. C., Büller, H. A., & Dekker, J.
Venue
Gut
Publisher
BMJ
Published
1999-03-01
Volume
44
Issue
3
Pages
387-393
ISSN
  • 0017-5749 (ISSN-L)
  • 1468-3288
OpenAlex
W2169401839
Cited by
162
References
2
FWCI
1.35
Type
journal article
Language
en
Open access
bronze

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CoChat. (2026). Citation check: Sulphation and secretion of the predominant secretory human colonic mucin MUC2 in ulcerative colitis. https://app.cochat.ai/papers/10.1136/gut.44.3.387
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Van Klinken, B. J.-W., Van der Wal, J.-W. G., Einerhand, A. W. C., Büller, H. A., & Dekker, J. (1999). Sulphation and secretion of the predominant secretory human colonic mucin MUC2 in ulcerative colitis. Gut. https://doi.org/10.1136/gut.44.3.387

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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).

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