By Frank J. (Editor) Dixon
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Extra resources for Advances in Immunology, Vol. 32
In contrast to the observations with seropositive individuals, when T cells from seronegative individuals were added to autologous B cells stimulated with EBV, no effect in either a positive or negative direction was observed during the 14 days of coculture. 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).
In addition, Dimitriu and Fauci (1978) have identified a factor released from human monocytes stimulated by supernatants of mixed lymphocyte cultures that augments the PWM-driven generation of anti-sheep red cell antibody secreting cells in human peripheral blood lymphocyte cultures. This monokine was specifically absorbed by a B-cell-enriched subpopulation, but not a T-cell-enriched population, supporting the view that the B cell was the target for that monocyte-derived factor. Finally, it has been easiest to demonstrate monocyte factor-augmented immunoglobulin production in T-cell-depleted B-cell systems in studies performed with cells from animals or from man (Wood, 1979).
After PWM activation, Tac-positive T cells possessed suppressor cell activity that was radiosensitive as well as helper T cell activity that was resistant to 2000 R irradiation. On the other hand, the Tac-negative cells manifested only helper-cell activity. , 1981b). , reactivity with anti-Ia and Tac antisera) and in terms of their radiosensitivity. V. Differences i n Polyclonal B-Cell Activators in Terms of Their Capacity to Activate Prosuppressor T Cells into Suppressor Effector Cells A distinct group of interacting T cells constitutes a suppressor cell network that inhibits antigen or polyclonally induced B cell maturation and immunoglobulin synthesis.
Advances in Immunology, Vol. 32 by Frank J. (Editor) Dixon