Células B foliculares

Las células B foliculares o células FO B, son un tipo de linfocito B que reside en los folículos linfoides primarios y secundarios (que contienen centros germinales) de los órganos linfoides secundarios y terciarios, incluidos el bazo y los ganglios linfáticos. Se cree que las respuestas de anticuerpos contra proteínas implican vías de células B foliculares en órganos linfoides secundarios.[1]

Pulpa blanca (flecha A), contiene los nódulos linfoides con células B foliculares en su interior.

Las células B maduras del bazo se pueden dividir en dos poblaciones principales:

  1. células FO B, que constituyen la mayoría,
  2. células B de la zona marginal (MZ B), que recubren el seno marginal y bordean la pulpa roja.[2]

Características

Las células FO B expresan altos niveles de IgD y CD23; niveles más bajos de CD21 e IgM; y no CD1 o CD5, distinguiendo fácilmente este compartimento de las células B, B1 y las células B de la zona marginal. Las células FO B se organizan en los folículos primarios de las zonas de células B enfocadas alrededor de las células dendríticas foliculares en la pulpa blanca del bazo y las áreas corticales de los ganglios linfáticos periféricos. Las imágenes en vivo de los ganglios linfáticos, basadas en multifotón indican el movimiento continuo de las células FO B dentro de estas áreas foliculares a velocidades de ~6 µm por min.[3]​ Estudios del 2006 indican movimiento a lo largo de los procesos de FDC como un sistema de guía para las células B en reposo maduras en los ganglios linfáticos periféricos.[4]​ A diferencia de su contraparte célula B de zona marginal, las células FO B recirculan libremente, y comprenden> 95% de las células B en los ganglios linfáticos periféricos.

El repertorio BCR del compartimento folicular de células B también aparece bajo presiones de selección positivas durante la maduración final en el bazo. Sin embargo, la diversidad es sustancialmente más amplia que los compartimentos de células B1 B y MZ B. Más importante aún, las células FO B requieren la ayuda de células TFH dependientes de CD40-CD40L para promover respuestas inmunes primarias efectivas y cambio de isotipo de anticuerpos y para establecer memoria de células B de alta afinidad.[5]

Véase también

Referencias

  1. Nutt, Stephen L.; Hodgkin, Philip D.; Tarlinton, David M.; Corcoran, Lynn M. (2015). «The generation of antibody-secreting plasma cells». Nature Reviews Immunology 15 (3): 160-171. PMID 25698678. doi:10.1038/nri3795. 
  2. Cerutti A, Cols M, Puga I (February 2013). «Marginal zone B cells: virtues of innate-like antibody-producing lymphocytes». Nature Reviews. Immunology 13 (2): 118-32. PMC 3652659. PMID 23348416. doi:10.1038/nri3383. 
  3. Miller M.J., Wei S.H., Parker I., et al. Two-photon imaging of lymphocyte motility and antigen response in intact lymph node. Science. 2002;296(5574):1869–1873.
  4. Bajenoff M, Egen JG, Koo LY, et al. Stromal cell networks regulate lymphocyte entry, migration, and territoriality in lymph nodes. Immunity. 2006;25(6):989–1001.
  5. McHeyzer-Williams LJ, McHeyzer-Williams MG. Antigen-specific memory B cell development. Annu Rev Immunol. 2005;23:487–513.

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