The Journal of Experimental Medicine
VeriKine-HS Human IFN-Beta
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Journal of Experimental Medicine, Vol 145, 1501-1510, Copyright © 1977 by Rockefeller University Press

ARTICLES

Suppression of IgE antibody production in SJL mice. III. Characterization of a suppressor substance extracted from normal SJL spleen cells

N Watanabe and Z Ovary

SJL mice were immunized with 1 microng dinitrophenylated keyhole limpet hemocyanin in 1 mg Al(OH)3. The mice were infected 21 days later with 750 third stage larvae of Nippostrongylus brasiliensis. On day 35, 14 days after infection, they were injected with 1 microng DNP-N, brasiliensis extract (Nb) in 1 mg Al(OH)3. In order to obtain high titer and persistent anti-DNP IgE antibody the mice were irradiated (540 R) 1 day after injection of DNP-Nb. Suppression of anti-DNP IgE antibody production was induced by spleen cells from normal SJL mice. Suppression of IgE antibody response is also obtained by an extract from normal SJL spleen cells. The suppressor substance from normal SJL spleen cell extract is a heat-labile protein, and is not absorbed by anti-mouse immunoglobulin. The mol wt of this substance is larger than 300,000 daltons as determined by gel filtration on Sephadex G-200, but after ultracentifugation, the supernate still has suppressive activity on IgE antibody production.
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