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By Frank J. Dixon, K. Frank Austen, Leroy E. Hood, Jonathan W. Uhr (Eds.)
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These cells have not yet reached a sufficient state of maturation that allows them to respond directly to T cell factors. Moreover the majority of them are unable to respond to PWM. The demonstration that the IgD- B cells were enriched in cells responding to T cell factors alone or PWM in the presence of T cells and the finding that they were also enriched for postswitch precursors of IgG- and IgAsecreting cells indicate that they were a more mature subset of B cells. Heterogeneity in the degree of activation could be found in the IgDpopulation.
It was of interest to determine whether the difference between the capacity of r-IL-2 and T cell supernatant to promote responsiveness of SA-activated B cells could be accounted for by IFN-y in the T cell supernatant. As shown in Table XI, T cell supernatant was much more effective than r-IL-2 at promoting DNA synthesis and generation of ISC from SA-activated B cells. The addition of r-IFN-y to r-11-2-supported cultures of SA-activated B cells enhanced the generation of ISC but not DNA synthesis.
However, when a commercially available preparation of low-molecular-weight BCGF was added to the IL-Zsupported cultures, synergistic amplification of responsiveness allowed maximal DNA synthesis. , 1985). 0 r-IL-2 Lymph node Nil T supt r-IL-2 * S . 1 * Spleen or lymph node B cells were cultured alone, with SA, or with 10 pg/ ml F(ab')z anti-p antibody in the presence or absence of T cell supernatant or 100 U/ml r-IL-2. r3H1Thymidineincorporation was assayed on day 5. Adapted from Jelinek and Lipsky (1987).
Advances in Immunology, Vol. 40 by Frank J. Dixon, K. Frank Austen, Leroy E. Hood, Jonathan W. Uhr (Eds.)