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Original Article |
Correspondence to: Klaus Rajewsky, Department of Immunology, Institute for Genetics, University of Cologne, Weyertal 121, D-50931 Cologne, Germany. Tel:49-221-4702467 Fax:49-221-4705185 E-mail:klaus.rajewsky{at}mac.genetik.uni-koeln.de.
To study homeostasis of peripheral B lymphocytes in the absence of B cell influx from the bone marrow, we generated a mouse mutant in which the recombination-activating gene (RAG)-2 can be inducibly deleted. When RAG-2 was deleted at the age of 810 wk, splenic naive follicular B cells were gradually lost over a year of observation, with a half-life of
4.5 mo. By contrast, the pool of marginal zone B cells in the spleen and of B-1 cells in the peritoneal cavity were kept at normal level. In lymph nodes,
90% of the B cells were lost within 4 mo, and B cell numbers remained constant thereafter. Mice in which RAG-2 was deleted at birth maintained a small population of activated B cells with an increased proportion of marginal zone B cells. Additionally, an increase of the pool of IgM secreting cells and B-1a cells was observed.
Key Words: RAG-2, mouse, marginal zone B cells, follicular B cells, half-life
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