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Department of Cell Biology and Histology, Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands
Follicular dendritic cells (FDCs) select B cells during germinal center (GC) reactions. The B cells that are able to bind to the FDCs receive a signal that leads to the termination of endonuclease activity in the nuclei of those B cells. This signal must be in addition to the signals transferred through the cross-linkage of the B cell receptors and signals resulting from the interactions of the adhesion molecules lymphocyte function-associated Ag-1 and very late Ag-4 with ICAM-1 and VCAM-1, respectively. In this report, we present evidence that the FDCs silence all apoptotic processes in GC B lymphocytes and additionally switch off pre-present endonuclease activity. We also show that GC B cell apoptosis requires cathepsin activity downstream of caspase-3. This cathepsin activity is directly connected to endonuclease activity and therefore may be an interesting target for the antiapoptotic factors produced by FDCs.
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