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. 1984 Jun;52(2):261–267.

T helper factor in contact sensitivity: antigen-specific I-A+ helper factor is made by an Lyt-1+2-, I-A+, I-J- T cell.

V Colizzi, G L Asherson, B M James, M Malkovsky
PMCID: PMC1454622  PMID: 6203833

Abstract

Antigen-specific T helper factor appears in the 24 hr supernatant of lymph node cells taken 4 days after immunization with contact sensitizer. The factor is assayed by its ability to augment the contact sensitivity response induced by haptenized spleen cells. In practice, picrylated or oxazolonated spleen cells are treated with the factor for 1 hr at 4 degrees and 4 x 10(6) cells are injected into the footpads of recipient mice. Contact sensitivity is assessed 5 days later. The factor first appears 3 days after immunization and its production depends on an Lyt-1+2-, I-A+, I-J- T cell. It is antigen-specific in its action in a criss-cross experiment, and can be absorbed with and eluted from haptenized beads. It bears I-A determinant(s) and the I-A determinant and the antigen binding site(s) occur on the same molecule. The molecular weight is around 60,000. The possible role of T helper factors in the activation of the antigen-presenting cell in the induction stage of the immune response is discussed.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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