The habitat, double life, citizenship, and forgetfulness of IgA

Macpherson, Andrew J; Geuking, Markus B; Slack, Emma; Hapfelmeier, Siegfried; McCoy, Kathy D (2012). The habitat, double life, citizenship, and forgetfulness of IgA. Immunological reviews, 245(1), pp. 132-146. Oxford: Wiley-Blackwell 10.1111/j.1600-065X.2011.01072.x

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Immunoglobulin A (IgA) is the main secretory immunoglobulin of mucous membranes and is powerfully induced by the presence of commensal microbes in the intestine. B cells undergo class switch recombination to IgA in the mucosa-associated lymphoid tissues, particularly mesenteric lymph nodes (MLNs) and Peyer's patches, through both T-dependent and T-independent pathways. IgA B cells primed in the mucosa traffic from the intestinal lymphoid structures, initially through the lymphatics and then join the bloodstream, to home back to the intestinal mucosa as IgA-secreting plasma cells. Once induced, anti-bacterial IgA can be extremely long-lived but is replaced if there is induction of additional IgA specificities by other microbes. The mucosal immune system is anatomically separated from the systemic immune system by the MLNs, which act as a firewall to prevent penetration of live intestinal bacteria to systemic sites. Dendritic cells sample intestinal bacteria and induce B cells to switch to IgA. In contrast, intestinal macrophages are adept at killing extracellular bacteria and are able to clear bacteria that have crossed the mucus and epithelial barriers. There is both a continuum between innate and adaptive immune mechanisms and compartmentalization of the mucosal immune system from systemic immunity that function to preserve host microbial mutualism.

Item Type:

Journal Article (Further Contribution)

Division/Institute:

04 Faculty of Medicine > Service Sector > Institute for Infectious Diseases > Research
04 Faculty of Medicine > Department of Gastro-intestinal, Liver and Lung Disorders (DMLL) > Clinic of Visceral Surgery and Medicine > Gastroenterology
04 Faculty of Medicine > Department of Gastro-intestinal, Liver and Lung Disorders (DMLL) > Clinic of Visceral Surgery and Medicine > Visceral Surgery

UniBE Contributor:

Macpherson, Andrew; Geuking, Markus; Hapfelmeier, Siegfried Hektor and McCoy, Kathleen

ISSN:

0105-2896

Publisher:

Wiley-Blackwell

Language:

English

Submitter:

Siegfried Hektor Hapfelmeier-Balmer

Date Deposited:

04 Oct 2013 14:39

Last Modified:

15 May 2015 10:46

Publisher DOI:

10.1111/j.1600-065X.2011.01072.x

PubMed ID:

22168417

Web of Science ID:

000298299800009

URI:

https://boris.unibe.ch/id/eprint/16028 (FactScience: 223578)

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