Summary
In this study a variety of immunostimulatory agents was tested alone or in combination with other agents to measure their ability to enhance nonspecific resistance to challenge with the TA3-Ha transplantable murine ascites tumor. Lipopolysaccharides (LPS) were effective alone in protecting mice from tumor. Their lipid-free, nontoxic, polysaccharide-rich hydrolytic products (PS) showed a much reduced, but still significant effect in anti-TA3-Ha resistance induction. Other agents that stimulated tumor resistance included nontoxic ‘native hapten’ and trehalose-6,6′-dimycolate (P3) of Ribi, synthetic glycolipids, cord factor, and killed BCG preparations. Simultaneous pretreatment with a combination of any of these agents and either LPS or PS resulted in a significantly higher level of tumor resistance. Administration of LPS, PS, or native hapten to mice that had been previously infected with viable BCG resulted in the strongest antitumor effect. These studies demonstrate that nonspecific resistance can be enhanced in an additive or synergistic manner by using combinations of agents, which presumably stimulate different cell populations of the host's immune system.
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Butler, R.C., Nowotny, A. Combined immunostimulation in the prevention of tumor take in mice using endotoxins, their derivatives, and other immune adjuvants. Cancer Immunol Immunother 6, 255–262 (1979). https://doi.org/10.1007/BF00200213
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DOI: https://doi.org/10.1007/BF00200213