Title |
The Rac2 Guanosine Triphosphatase Regulates B Lymphocyte Antigen Receptor Responses and Chemotaxis and Is Required for Establishment of B-1a and Marginal Zone B Lymphocytes
|
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Published in |
The Journal of Immunology, April 2002
|
DOI | 10.4049/jimmunol.168.7.3376 |
Pubmed ID | |
Authors |
Ben A. Croker, David M. Tarlinton, Leonie A. Cluse, Alana J. Tuxen, Amanda Light, Feng-Chun Yang, David A. Williams, Andrew W. Roberts |
Abstract |
We have defined roles for the hemopoietic-specific Rho guanosine triphosphatase, Rac2, in B lymphocyte development and function through examination of rac2(-/-) mice. Rac2-deficient mice displayed peripheral blood B lymphocytosis and marked reductions in peritoneal cavity B-1a lymphocytes, marginal zone B lymphocytes, and IgM-secreting plasma cells as well as reduced concentrations of serum IgM and IgA. The rac2(-/-) B lymphocytes exhibited reduced calcium flux following coligation of B cell AgR and CD19 and reduced chemotaxis in chemokine gradients. T cell-independent responses to DNP-dextran were of reduced magnitude, but normal kinetics, in rac2(-/-) mice, while T-dependent responses to nitrophenyl-keyhole limpet hemocyanin were subtly abnormal. Rac2 is therefore an essential element in regulating B lymphocyte functions and maintaining B lymphocyte populations in vivo. |
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Geographical breakdown
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United States | 1 | 2% |
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Demographic breakdown
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Student > Ph. D. Student | 10 | 23% |
Professor | 3 | 7% |
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