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A unique B2 B cell subset in the intestine

Over 80% of the body's activated B cells are located in mucosal sites, including the intestine. The intestine contains IgM(+) B cells, but these cells have not been characterized phenotypically or in terms of their developmental origins. We describe a previously unidentified and unique subset o...

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Detalles Bibliográficos
Autores principales: Shimomura, Yasuyo, Ogawa, Atsuhiro, Kawada, Mayumi, Sugimoto, Ken, Mizoguchi, Emiko, Shi, Hai-Ning, Pillai, Shiv, Bhan, Atul K., Mizoguchi, Atsushi
Formato: Texto
Lenguaje:English
Publicado: The Rockefeller University Press 2008
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2413032/
https://www.ncbi.nlm.nih.gov/pubmed/18519649
http://dx.doi.org/10.1084/jem.20071572
Descripción
Sumario:Over 80% of the body's activated B cells are located in mucosal sites, including the intestine. The intestine contains IgM(+) B cells, but these cells have not been characterized phenotypically or in terms of their developmental origins. We describe a previously unidentified and unique subset of immunoglobulin M(+) B cells that present with an AA4.1(−)CD21(−)CD23(−) major histocompatibility complex class II(bright) surface phenotype and are characterized by a low frequency of somatic hypermutation and the potential ability to produce interleukin-12p70. This B cell subset resides within the normal mucosa of the large intestine and expands in response to inflammation. Some of these intestinal B cells originate from the AA4.1(+) immature B2 cell pool in the steady state and are also recruited from the recirculating naive B cell pool in the context of intestinal inflammation. They develop in an antigen-independent and BAFF-dependent manner in the absence of T cell help. Expansion of these cells can be induced in the absence of the spleen and gut-associated lymphoid tissues. These results describe the existence of an alternative pathway of B cell maturation in the periphery that gives rise to a tissue-specific B cell subset.