The BCL6 RD2 domain governs commitment of activated B cells to form germinal centers.

Abstract:

:To understand how the Bcl6 transcriptional repressor functions in the immune system, we disrupted its RD2 repression domain in mice. Bcl6RD2(MUT) mice exhibit a complete loss of germinal center (GC) formation but retain normal extrafollicular responses. Bcl6RD2(MUT) antigen-engaged B cells migrate to the interfollicular zone and interact with cognate T helper cells. However, these cells fail to complete early GC-commitment differentiation and coalesce as nascent GC aggregates. Bcl6 directly binds and represses trafficking receptors S1pr1 and Gpr183 by recruiting Hdac2 through the RD2 domain. Deregulation of these genes impairs B cell migration and may contribute to GC failure in Bcl6RD2(MUT) mice. The development of functional GC-TFH cells was partially impaired in Bcl6RD2(MUT) mice. In contrast to Bcl6(-/-) mice, Bcl6RD2(MUT) animals experience no inflammatory disease or macrophage deregulation. These results reveal an essential role for RD2 repression in early GC commitment and striking biochemical specificity in Bcl6 control of humoral and innate immune-cell phenotypes.

journal_name

Cell Rep

journal_title

Cell reports

authors

Huang C,Gonzalez DG,Cote CM,Jiang Y,Hatzi K,Teater M,Dai K,Hla T,Haberman AM,Melnick A

doi

10.1016/j.celrep.2014.07.059

subject

Has Abstract

pub_date

2014-09-11 00:00:00

pages

1497-508

issue

5

issn

2211-1247

pii

S2211-1247(14)00662-7

journal_volume

8

pub_type

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