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The Journal of Immunology, 2003, 171: 547-551.
Copyright © 2003 by The American Association of Immunologists

CUTTING EDGE

Cutting Edge: Germinal Centers Formed in the Absence of B Cell-Activating Factor Belonging to the TNF Family Exhibit Impaired Maturation and Function

Kalpit A. Vora1,2, Li Chun Wang1,3, Sambasiva P. Rao, Zhong-Ying Liu, Gerard R. Majeau, Anne H. Cutler, Paula S. Hochman, Martin L. Scott and Susan L. Kalled4

Department of Immunology and Inflammation, Biogen, Inc., Cambridge, MA 02142

Germinal centers (GCs) form in B cell follicles and require specific signals for development and maintenance. B cell-activating factor belonging to the TNF family (BAFF) is a fundamental B cell survival factor and therefore may influence GC reactions and subsequent Ab responses. To test this possibility, the effect of BAFF neutralization in immunized mice was assessed. Using B cell maturation Ag-Fc, we demonstrate that BAFF blockade does not inhibit GC formation or somatic hypermutation. However, GCs in B cell maturation Ag-Fc-treated mice dissipated more rapidly than those of control mice and did not form a mature follicular dendritic cell reticulum. Examination of immunized BAFF-null mice validated the BAFF-independent nature of GC formation. Furthermore, Ab responses, including high-affinity responses, were attenuated. This is the first evidence that BAFF is required for maintenance, but not initiation, of the GC reaction, and it further hints that somatic hypermutation within the GC and selection of Ag-specific high-affinity Ab could be uncoupled.




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