Enhancement of terminal B lymphocyte differentiation in vitro by fibroblast-like stromal cells from human spleen - PubMed (original) (raw)
Enhancement of terminal B lymphocyte differentiation in vitro by fibroblast-like stromal cells from human spleen
G Skibinski et al. Eur J Immunol. 1998 Dec.
Free article
Abstract
Stromal elements are major components of lymphoid tissues contributing to both tissue architecture and function. In this study we report on the phenotype and function of fibroblast-like stromal cells obtained from human spleen. These cells express high levels of CD44 and ICAM-1 and moderate levels of VLA-4, VCAM, CD40 and CD21. They fail to express endothelial, epithelial, lymphocyte and monocyte/macrophage markers. We show that these cells interact with B cell blasts induced in vitro by anti-CD40 and anti-mu stimulation. As a result of these interactions both IL-6 and IgG secretion into culture medium is increased. The enhanced secretion of IgG is partly inhibited by abolishing B cell blaststromal cell contact or by anti-IL-6, anti-VCAM or anti-CD49d antibodies. Our studies also suggest that the ability of stromal cells to promote B cell survival is most likely the underlying mechanism of the enhanced immunoglobulin secretion. Comparison of stromal cells from different lymphoid and non-lymphoid organs revealed that bone marrow- and spleen-derived stromal cells are the most effective in promoting B cell blast differentiation.
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