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By Frank J. (Editor) Dixon

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One of the critical differences between the EBV and PWM systems of B-cell activation is on the effects observed when-allogeneic cells are mixed in cocultures. , 1977). However, when similar allogeneic cellmixing experiments were performed using EBV as the B-cell stimulant, a very different effect was observed (Blaese and Tosato, 1982). Strong suppression of the expected reverse plaque response to EBV was observed when allogeneic cells that were not matched at the HLA-A or B locus were cocultured.

In addition, suppression was observed with all polyclonal B-cell activators examined. Most polyclonal B-cell activators could theoretically act as monocyte activators as well. , 1976) and thus would presumably not do so. These observations support the view that high numbers of monocytes that have not been specially activated inhibit the proliferation and differentiation of human B cells. The mode of action and the cellular target of monocyte suppressors has been examined in the in uitro immunoglobulin synthesis system.

In addition, when lop5 M hydrocortisone was added to these cultures, the immunoglobulin synthesized at a T:B cell ratio of 9: 1was greater than the synthesis of T and B cells cultured in the absence of hydrocortisone at a ratio of 1:l (Fig. 4C compared to 4A). As noted below, there was no inhibition of immunoglobulin synthesis at high T:B cell ratios when NWSM was the sole activator of immunoglobulin synthesis. However, the NWSM-stimulated immunoglobulin synthesis was reduced by 98% when PWM was added to these NWSM-stimulated cells cultured at T:B cell ratios of 9:l.

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