Abstract:
:The human peripheral B-cell compartment displays a large population of immunoglobulin M-positive, immunoglobulin D-positive CD27(+) (IgM(+)IgD(+)CD27(+)) "memory" B cells carrying a mutated immunoglobulin receptor. By means of phenotypic analysis, complementarity-determining region 3 (CDR3) spectratyping during a T-independent response, and gene-expression profiling of the different blood and splenic B-cell subsets, we show here that blood IgM(+)IgD(+)CD27(+) cells correspond to circulating splenic marginal zone B cells. Furthermore, analysis of this peripheral subset in healthy children younger than 2 years shows that these B cells develop and mutate their immunoglobulin receptor during ontogeny, prior to their differentiation into T-independent antigen-responsive cells. It is therefore proposed that these IgM(+)IgD(+)CD27(+) B cells provide the splenic marginal zone with a diversified and protective preimmune repertoire in charge of the responses against encapsulated bacteria.
journal_name
Bloodjournal_title
Bloodauthors
Weller S,Braun MC,Tan BK,Rosenwald A,Cordier C,Conley ME,Plebani A,Kumararatne DS,Bonnet D,Tournilhac O,Tchernia G,Steiniger B,Staudt LM,Casanova JL,Reynaud CA,Weill JCdoi
10.1182/blood-2004-01-0346subject
Has Abstractpub_date
2004-12-01 00:00:00pages
3647-54issue
12eissn
0006-4971issn
1528-0020pii
2004-01-0346journal_volume
104pub_type
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