Abstract
The health and environment of the host influence the ‘natural cytotoxicity’ of mouse peritoneal macrophages against tumor targets in vitro. In these studies, we have used mice derived by hysterectomy and maintained under barrier conditions. Peritoneal macrophages harvested from untreated mice and from those that received IP injections of thioglycollate broth, bactopeptone, or soluble concanavalin A were not cytotoxic to tumor targets in vitro. Resident and various inflammatory macrophages responded alike to activation by lipopolysaccharide or macrophage-activating factor.
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