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J. Exp. Med., Volume 190, Number 1, July 5, 1999 75-90
Copyright © 1999 by The Rockefeller University Press.

B Cell Development in the Spleen Takes Place in Discrete Steps and Is Determined by the Quality of B Cell Receptor–derived Signals

Florienne Lodera, Bettina Mutschlera, Robert J. Rayc, Christopher J. Paigec, Paschalis Siderasd, Raul Torrese, Marinus C. Lamersb, and Rita Carsettia
a From the Department of Molecular Immunology, Institute of Biology III, University of Freiburg, and the Max-Planck-Institute for Immunobiology, D-79108 Freiburg, Germany
b Department of Developmental Immunology, Max-Planck-Institute for Immunobiology, D-79108 Freiburg, Germany
c Wellesley Hospital Research Institute, Toronto, Ontario M4Y 1J3, Canada
d Department of Applied Cellular and Molecular Biology, Umeå University, S-901 87 Umeå, Sweden
e Basel Institute for Immunology, 4005 Basel, Switzerland

Correspondence to: Rita Carsetti

Only mature B lymphocytes can enter the lymphoid follicles of spleen and lymph nodes and thus efficiently participate in the immune response. Mature, long-lived B lymphocytes derive from short-lived precursors generated in the bone marrow. We show that selection into the mature pool is an active process and takes place in the spleen. Two populations of splenic B cells were identified as precursors for mature B cells. Transitional B cells of type 1 (T1) are recent immigrants from the bone marrow. They develop into the transitional B cells of type 2 (T2), which are cycling and found exclusively in the primary follicles of the spleen. Mature B cells can be generated from T1 or T2 B cells.

Key Words: B cell development, transitional B cells, spleen, CD45, Bruton's tyrosine kinase


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