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SIgA Binding to Mucosal Surfaces Is Mediated by Mucin-Mucin Interactions

Research output: Contribution to journalArticle

Hannah Gibbins, Gordon Burgess Proctor, Gleb E. Yakubov, Stephen W Wilson, Guy Howard Carpenter

Original languageEnglish
Pages (from-to)1-13
Number of pages13
JournalPLOS One
Volume10
Issue number3
DOIs
Publication statusPublished - 20 Mar 2015

Documents

  • journal.pone.0119677

    journal.pone.0119677.pdf, 8.24 MB, application/pdf

    22/01/2016

    Final published version

    CC BY

King's Authors

Abstract

The oral mucosal pellicle is a layer of absorbed salivary proteins, including secretory IgA (SIgA), bound onto the surface of oral epithelial cells and is a useful model for all mucosal surfaces. The mechanism by which SIgA concentrates on mucosal surfaces is examined here using a tissue culture model with real saliva. Salivary mucins may initiate the formation of the mucosal pellicle through interactions with membrane-bound mucins on cells. Further protein interactions with mucins may then trigger binding of other pellicle proteins. HT29 colon cell lines, which when treated with methotrexate (HT29-MTX) produce a gel-forming mucin, were used to determine the importance of these mucin-mucin interactions. Binding of SIgA to cells was then compared using whole mouth saliva, parotid (mucin-free) saliva and a source of purified SIgA. Greatest SIgA binding occurred when WMS was incubated with HT29-MTX expressing mucus. Since salivary MUC5B was only able to bind to cells which produced mucus and purified SIgA showed little binding to the same cells we conclude that most SIgA binding to mucosal cells occurs because SIgA forms complexes with salivary mucins which then bind to cells expressing membrane-bound mucins. This work highlights the importance of mucin interactions in the development of the mucosal pellicle.

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