This study was designed to investigate whether follicular dendritic cells (FDC) can activate B cells to a state in which they can function as effective antigen-presenting cells (APC). High buoyant density (i.e., resting) B cells specific for 2,4-dinitro-fluorobenzene (DNP) were incubated with DNP-ovalbumin (OVA) bearing FDC, after which their capacity to process and present to an OVA-specific T cell clone was assessed. The efficacies of alternative sources of antigen and activation signals in the induction of B cell APC function were compared with those provided by FDC. Only FDC and Sepharose beads coated with anti-immunoglobulin (Ig)kappa monoclonal antibody provided the necessary stimulus. FDC carrying inappropriate antigens also induced B cell APC function in the presence of exogenous DNP-OVA. However, in circumstances where soluble DNP-OVA was limiting, FDC bearing complexes containing DNP, which could crosslink B cell Ig receptors, induced the most potent APC function. Analysis by flow cytometry revealed that within 24 h of coculture with FDC, a significant percentage of B cells increased in size and expressed higher levels of major histocompatibility complex class II. By 48 h, an upregulation of the costimulatory molecule, B7/BB1, occurred, but only when exposed to the FDC bearing DNP. Taken together, the results demonstrate that FDC have the capacity to activate resting B cells to a state in which they can function as APC for T cells. The stimuli that FDC provide may include: (a) an antigen-dependent signal that influences the upregulation of B7/BB1; and (b) possibly a signal independent of crosslinking mIg that results in Ig internalization. The relevance of these findings to the formation of germinal centers and maintenance of the humoral response is discussed.
Article|
December 01 1993
Follicular dendritic cells help resting B cells to become effective antigen-presenting cells: induction of B7/BB1 and upregulation of major histocompatibility complex class II molecules.
M H Kosco-Vilbois,
M H Kosco-Vilbois
Basel Institute for Immunology, Switzerland.
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D Gray,
D Gray
Basel Institute for Immunology, Switzerland.
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D Scheidegger,
D Scheidegger
Basel Institute for Immunology, Switzerland.
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M Julius
M Julius
Basel Institute for Immunology, Switzerland.
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M H Kosco-Vilbois
Basel Institute for Immunology, Switzerland.
D Gray
Basel Institute for Immunology, Switzerland.
D Scheidegger
Basel Institute for Immunology, Switzerland.
M Julius
Basel Institute for Immunology, Switzerland.
Online ISSN: 1540-9538
Print ISSN: 0022-1007
J Exp Med (1993) 178 (6): 2055–2066.
Citation
M H Kosco-Vilbois, D Gray, D Scheidegger, M Julius; Follicular dendritic cells help resting B cells to become effective antigen-presenting cells: induction of B7/BB1 and upregulation of major histocompatibility complex class II molecules.. J Exp Med 1 December 1993; 178 (6): 2055–2066. doi: https://doi.org/10.1084/jem.178.6.2055
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