The bilateral responsiveness between intestinal microbes and IgA

Macpherson, Andrew; Köller, Yasmin; McCoy, Kathleen (2015). The bilateral responsiveness between intestinal microbes and IgA. Trends in immunology, 36(8), pp. 460-470. Elsevier 10.1016/j.it.2015.06.006

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The immune system has developed strategies to maintain a homeostatic relationship with the resident microbiota. IgA is central in holding this relationship, as the most dominant immunoglobulin isotype at the mucosal surface of the intestine. Recent studies report a role for IgA in shaping the composition of the intestinal microbiota and exploit strategies to characterise IgA-binding bacteria for their inflammatory potential. We review these findings here, and place them in context of the current understanding of the range of microorganisms that contribute to the IgA repertoire and the pathways that determine the quality of the IgA response. We examine why only certain intestinal microbes are coated with IgA, and discuss how understanding the determinants of this specific responsiveness may provide insight into diseases associated with dysbiosis.

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