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By Frank J. Dixon, K. Frank Austen, Leroy E. Hood, Jonathan W. Uhr (Eds.)

ISBN-10: 0120224402

ISBN-13: 9780120224401

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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).

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Advances in Immunology, Vol. 40 by Frank J. Dixon, K. Frank Austen, Leroy E. Hood, Jonathan W. Uhr (Eds.)

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