Abstract
We have investigated differential mechanism for differentiation of human peripheral blood resting B cells to Ig-secreting cells. Purified resting B cells were further fractionated into subsets by discontinuous density gradients of Percoll, and proliferation and differentiation responses to Staphylococcus aureus Cowan I (SAC) and/or T cell-derived soluble factors were studied. High density resting B cells were stimulated to proliferate vigorously in response to SAC, but were poorly differentiated by SAC in presence of T cell factors. In contrast, low density resting B cells failed to proliferate in response to SAC and/or T cell factors; these cells could, however, be induced by stimulation with SAC plus T cell factors to become cells actively secreting Ig. These results indicate that there may exist heterogeneity in the human resting B cells: one subset of resting B cells (B cells with low density) can differentiate directly into Ig-secreting cells without the need for proliferation, and another subset (B cells with high density) can proliferate actively without subsequent differentiation into Ig-secreting cells. To address whether these resting B cell subsets belong to the same lineage, only high density B cells recovered from circulating resting B cells were first stimulated for 7 d with SAC, refractionated on Percoll gradients, and differentiation response of the refractionated B cells to SAC and T cell factors was examined. B cells shifting toward low density fraction were located in the resting status and could differentiate in response to SAC plus T cell factors. These results indicate that some of B cells with high density belong to the same cell lineage as those with low density and they must first proliferate before differentiation.
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Selected References
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