The Journal of Experimental Medicine
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Journal of Experimental Medicine, Vol 178, 257-264, Copyright © 1993 by Rockefeller University Press


ARTICLES

Inhibition of murine B and T lymphopoiesis in vivo by an anti- interleukin 7 monoclonal antibody

KH Grabstein, TJ Waldschmidt, FD Finkelman, BW Hess, AR Alpert, NE Boiani, AE Namen and PJ Morrissey
Immunex Research and Development Corporation, Seattle, Washington 98101.

The effects of interleukin 7 (IL-7) on the growth and differentiation of murine B cell progenitors has been well characterized using in vitro culture methods. We have investigated the role of IL-7 in vivo using a monoclonal antibody that neutralizes IL-7. We find that treatment of mice with this antibody completely inhibits the development of B cell progenitors from the pro-B cell stage forward. We also provide evidence that all peripheral B cells, including those of the B-1 and conventional lineages, are derived from IL-7-dependent precursors. The results are consistent with the rapid turnover of B cell progenitors in the marrow, but a slow turnover of mature B cells in the periphery. In addition to effects on B cell development, anti-IL-7 treatment substantially reduced thymus cellularity, affecting all major thymic subpopulations.
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