The essential role of endogenous IFN α/β in the anti‐metastatic action of sensitized T lymphocytes in mice injected with friend erythroleukemia cells

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Abstract
Adoptive transfer of splenic T lymphocytes from DBA/2 mice immunized against Friend erythroleukemia cells (FLC) inhibited the development of visceral metastases and increased the survival time of DBA/2 mice challenged i.v. with parental FLC 24 hr to 2 months later. Immune spleen cells were ineffective in mice pre-treated with potent neutralizing antibody to mouse IFN α/β (but not to IFN γ), demonstrating the essential participation of endogenous IFN α/β in the inhibitory action of immune T lymphocytes against FLC metastases. These findings suggest that the reported inability of immune T lymphocytes to exert an anti-FLC effect in immunodeficient DBA/2 mutant beige (bg/bg) mice (unless these mice had also been treated with IFN α/β), may have been due to lower levels of endogenous IFN α/β in DBA/2 bg/bg mice than in normal DBA/2 +/bg mice. Experimental results in support of this hypothesis are presented. © 1995 Wiley-Liss, Inc.

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