Antigen-specific suppressor cells and suppressive extracts obtained from the thymuses of DBA/2 mice bearing small syngeneic P815 mastocytomas were compared for their immunogenetic properties and requirements. The assay for specific suppression involved the ability of either cells or extracts to inhibit the primary in vitro cytotoxic response of normal DBA/2 splenocytes to mitomycin-treated P815 cells. It was shown that pretreatment of suppressor cell populations with anti-Iad antiserum plus rabbit complement removed the suppressive activity. Similarly, absorption of the suppressor factor with anti-Ia(d) antiserum removed the suppressive properties of the material. It was found that the suppressor cells, generated in DBA/2 tumor bearers, were capable of specifically suppressing the anti-P815 response of B6D2 F1 radiation chimeras possessing lymphoid cells of the H-2(b) or H-2(t2) haplotype equally as well as they could suppress the response of H-2(d)-bearing effector cells. This indicates that the suppressor cells are not H-2 restricted with respect to K or D markers on the responder cells in this system.
|Original language||English (US)|
|Number of pages||6|
|Journal||Journal of Immunology|
|State||Published - Dec 1 1979|
ASJC Scopus subject areas
- Immunology and Allergy