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The Journal of Immunology, Vol 138, Issue 3 704-712, Copyright © 1987 by American Association of Immunologists

ARTICLES

Specific inhibition of hybrid resistance in F1 hybrid mice pretreated with parent strain spleen cells. I. Induction of a nylon-adherent, Thy- 1+Lyt-1+2- suppressor cell

K Kosmatopoulos and S Orbach-Arbouys

Hybrid resistance, which is observed in certain strain combinations when parent-strain bone marrow cells are grafted into lethally irradiated F1 hybrids, can be specifically overcome by the i.v. injection, 1 wk before the graft, of spleen cells syngeneic with the bone marrow graft. This phenomenon is due to a suppressor mechanism, induced in the spleen of the F1 hybrid by the injection of parent- strain spleen cells and mediated by a nylon-adherent Thy-1+Lyt-1+2- cell population of hybrid origin, because hybrid resistance can be inhibited by the transfer into a normal B6D2F1 of nylon-adherent Thy- 1+Lyt-1+2- spleen cells from B6D2F1 mice pretreated with B6 spleen cells 1 wk earlier (B6-pretreated B6D2F1); spleen cells from B6- pretreated B6D2F1 mice not depleted of their nylon-adherent subpopulation cannot restore hybrid resistance when they are injected into a B6D2F1 rendered nonresistant by split-dose irradiation; and spleen cells from normal B6D2F1 mice cannot restore hybrid resistance when they are injected into B6-pretreated B6D2F1 hybrids. The suppressor cells specifically inhibit resistance against bone marrow cells syngeneic with the spleen cells used for pretreatment, because transfer of nylon-adherent B6-pretreated B6D2F1 spleen cells into a normal B6D2F1 does not enhance syngeneic B6D2F1 or parent-strain D2 bone marrow growth, and when injected into normal B6D2F1 hybrids, nylon- adherent spleen cells from B6D2F1 mice pretreated with D2 spleen cells 1 wk earlier (D2-pretreated B6D2F1) are not able to transfer the inhibition of hybrid resistance against B6 bone marrow cells. Moreover, the activity of the suppressor cells depends on the genetic environment of the hybrid host mice, because nylon-adherent B6-pretreated B6D2F1 spleen cells injected into normal B6C3F1 hybrids do not transfer an inhibition of hybrid resistance, and when injected into B6C3F1 hosts previously rendered nonresistant by split-dose irradiation, spleen cells from B6-pretreated B6D2F1 mice can, in contrast, transfer hybrid resistance.


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