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The Journal of Immunology, Vol 131, Issue 6 2682-2686, Copyright © 1983 by American Association of Immunologists

ARTICLES

Desensitization of contact allergy to DNFB in mice. I. Description of a model system

HN Claman and BD Jaffee

We investigated the down-regulation of contact sensitivity (desensitization) in mice sensitized to DNFB. Mice were sensitized with DNFB, desensitized with antigen 2 wk later, and resensitized 2 wk after desensitization. Large doses of antigen (DNFB or DNBSO3) produced about 50% inhibition of the anamnestic response as measured by ear swelling after challenge with DNFB. Desensitization was antigen specific and long lasting. Lymph node cells from desensitized mice showed diminished antigen-induced proliferation in vitro. Although the anamnestic response can be inhibited by afferent- or efferent-acting suppressor cells, such suppressor cells were not demonstrated in desensitized animals. The most likely explanation is that antigen desensitizes by inactivating effector cells for contact sensitivity, although suppressor mechanisms have not been completely excluded.




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