THE ROLE OF H‐2 AND H‐2‐LIKE DETERMINANTS IN SYNGENEIC AND ALLOGENEIC CYTOSTASIS

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Abstract
SUMMARY: Specific sensitization against H‐2 determinants was effected by immunizing allogeneic mice with spleen and lymph node cells in H‐2 congenic combinations. Lymph nodes from the sensitized and non‐sensitized mice were respectively cultured together with H‐2 syngeneic tumour cell lines. The growth and viability of the tumour cells was subsequently measured by the amount of radiothymidine incorporation. If the tumour cells incorporated less isotope when cultured with the immune cells than with the normal cells this was termed ‘cytostasis’. To identify the H‐2 genes controlling the sensitization phase in the cytostasis assay, we studied the effect on different transplantable tumour target cells of lymphoid cells from mice sensitized against different congenic spleen cells. The results suggest that the cytostasis assay can measure an in vitro specific response to H‐2‐incompatible sensitizing antigens, and that I‐B incompatibility, together with K and/or D, is essential to produce effectors. Furthermore, H‐2 allogeneic sensitization could induce cytostasis even against tumour cells syngeneic for the H‐2 halotype of the responder strain. The implications of these findings are discussed.

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