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Krop I , deFougerolles AR , Hardy RR , Allison M , Schlissel MS , Fearon DT
Self-renewal of B-1 lymphocytes is dependent on CD19
European Journal of Immunology. 1996 Jan;26(1) :238-242
PMID: ISI:A1996UD13800036   
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The B-1 subset of B lymphocytes is maintained by self-renewal of mature cells, and this process may involve signaling through membrane immunoglobulin (mIg). We determined whether CD19, a membrane protein that co-stimulates B cells by mig, has a role in this process. Pre-natal treatment of mice with 1D3, a rat anti-mouse CD19 monoclonal antibody, down-regulated CD19 expression and reduced by sixfold the number of B-1a cells at birth: B-2 cells were relatively unaffected. Prolonged treatment of adult mice with 1D3 caused the loss of approximately 2% per day of peritoneal B-1a cells, without diminishing the recovery of splenic B-2 cells. The loss of B-1a cells was associated with inhibition of their replication rather than with accelerated turnover. Therefore, CD19 is involved in the development and self-renewal of B-1a cells, perhaps through its ability to amplify signaling through mIgM.
Times Cited: 66 English Article UD138 EUR J IMMUNOL