RAPID ACQUISITION OF AN ENHANCED CAPACITY TO PRODUCE TUMOR-NECROSIS-FACTOR, ALPHA-BETA-INTERFERON, AND INTERLEUKIN-6 AFTER IMPLANTATION OF TUMOR-CELLS

This study shows that the ability of mice to produce tumor necrosis factor (TNF), alpha/beta interferon (IFN-α/β), and interleukin 6 (IL-6), but not interleukin 1 (IL-1), in response to endotoxin was dramatically augmented within 24 h intradermal implantation of 106 tumor cells. Tumor cell implantation also caused endotoxin-independent appearance of IFN-α/β and IL-6 in serum within 24 h. Priming for endotoxin-induced TNF production was not evident during the first 12 h of tumor cell implantation and it had decreased by 72 h. However, this decrease was followed by a second peak of priming on day 6 of tumor growth. Priming for endotoxin-induced TNF production was not induced by injection of dead tumor cells, the products of live tumor cells, or syngeneic or allogeneic splenocytes. Priming for TNF production was associated with an increased susceptibility of mice to endotoxin toxicity. These data suggest the existence of a cytokine-dependent host defense mechanism that is rapidly elicited in response to tumor cell implantation. © 1991.