The Journal of Immunology, Vol 146, Issue 4 1118-1124, Copyright © 1991 by American Association of Immunologists

ARTICLES

Cognate interactions between helper T cells and B cells. V. Reconstitution of T helper cell function using purified plasma membranes from activated Th1 and Th2 T helper cells and lymphokines

RJ Noelle, J Daum, WC Bartlett, J McCann and DM Shepherd
Department of Microbiology, Dartmouth Medical School, Hanover, NH 03755.

Th physically interact with B cells and produce lymphokines that influence B cell growth and differentiation. The respective contribution of cell contact and lymphokines to induction of B cell growth and differentiation was addressed using purified plasma membranes (PM) from resting Th (PMrest) and anti-CD3-activated Th (PMCD3) together with lymphokines. Results show that PMCD3, but not PMrest, induce 10% of resting B cells to enter the G1 phase of the cell cycle, with few B cells entering G1b and S/G2. The inclusion of IL-4, but not IL-2, IL-5, or IFN-gamma, amplifies the B cell response to PMCD3 by increasing the total percentage of activatable B cells to greater than 40% and inducing B cell progression into G1b, S, and G2. Direct comparison between PMrest and PMCD3 purified from Th1 and Th2 indicate that both Th1 and Th2 induce similar levels of B cell proliferation in the presence of IL-4. Further, the lymphokine requirements for B cell proliferation induced by PMCD3 from Th1 and Th2 is indistinguishable. B cell differentiation to IgM, IgG1, and IgG2a synthesis by PMCD3 required IL-4 and IL-5. Using lymphokine conditions that supported B cell differentiation, PMCD3 purified from Th1 and Th2 induced similar levels of IgM, and IgG1. Given the functional data on PMCD3 from Th1 and Th2, the data indicate that there are no substantive differences between Th1- and Th2-derived PMCD3, and that the major differences in the ability of viable Th1 and Th2 to activate B cells is the lymphokines produced by the cells.

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