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. 1991 Oct;59(10):3492–3497. doi: 10.1128/iai.59.10.3492-3497.1991

Interaction of a salivary mucin-secretory immunoglobulin A complex with mucosal pathogens.

A R Biesbrock 1, M S Reddy 1, M J Levine 1
PMCID: PMC258911  PMID: 1910004

Abstract

This study examined the interaction of a human salivary low-molecular-weight mucin (MG2) with Staphylococcus aureus and Pseudomonas aeruginosa by using both solution-phase and solid-phase assays. In solution phase, MG2 in human submandibular-sublingual saliva (HSMSL) bound to the bacterial surface; however, the highly purified mucin isoforms (MG2a and MG2b) did not. Mucin binding appeared to be dependent on heterotypic complexing between MG2 and secretory immunoglobulin A (IgA), although other salivary molecules may also be involved. In contrast, in a solid-phase assay in which HSMSL, MG2-containing fractions with secretory IgA, and purified MG2 were immobilized onto a solid surface, there was minimal adherence of S. aureus. The collective results suggest that mucin binding to S. aureus and P. aeruginosa may be predicated on the formation of an MG2-secretory IgA complex. Such interactions may facilitate microbial clearance from the oral cavity and play an important role in preventing colonization of the oral cavity and the respiratory tract by potential pathogens.

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Selected References

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