Galili N, Devens B, Naor D, Becker S, Klein E. Immune responses to weakly immunogenic virally induced tumors. I. Overcoming low responsiveness by priming mice with a syngeneic in vitro tumor line or allogeneic cross-reactive tumor.
Eur J Immunol 1978;
8:17-22. [PMID:
639838 DOI:
10.1002/eji.1830080105]
[Citation(s) in RCA: 21] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
This report describes model systems which show low primary in vitro syngeneic cytotoxic responses to a Moloney-induced YAC tumor (syngeneic in A mice) and a Rauscher-induced RBL5 tumor (syngeneic in C57BL/6 mice) and examines different approaches to overcome these defects. Two major findings were obtained: (a) spleen cells from A mice, injected with tumor cells from an in vitro tumor line YAC-1, derived from YACL, could generate a significant syngeneic cytotoxic response. In contrast, spleen cells from A mice injected with tumor cells from the in vivo tumor line failed to generate a syngeneic cytotoxic response. Thus, tumor cells from the in vitro line were more immunogeneic that those from the in vivo line. (b) Spleen cells from A mice which were injected with the cross-reactive allogeneic tumor RBL5, could generate significant cytotoxic responses to the syngeneic tumors YAC and YAC-1. Similarly, spleen cells from C57BL/6 mice injected with the cross-reactive allogeneic tumor YAC-1, could generate a significant cytotoxic response to the syngeneic tumor RBL5. Thus, cross-reactive allogeneic tumors could stimulate syngeneic cytotoxicity. The theoretical and the practical implications of these studies are discussed.
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