[Increasing the sensitivity of in vitro transformed hamster embryo cells (STHE strain) to cytolysis by resident and activated macrophages].

The sensitivity of low-malignant spontaneously in vitro transformed hamster embryo cells (STHE strain) to cytolysis of both resident and activated macrophages has been examined with cytolytic 3H-thymidine release assay. Activated macrophages were obtained from Syrian hamster peritoneal exudate cells 5 days following priming with 3% thioglycollate-broth and subsequent in vitro activation with proper-myl, levan, LPS, MDP, 1,4-dihydropyridine-derivate PP-256 and PMA. It has been shown that the STHE strain cells were sensitive to cytolysis by only fully activated macrophages. Both resident and non-activated (Thioglycollate-elicited) macrophages have not developed significant levels of the cytolytic activity against STHE cell targets. Short-term treatment of STHE cells with actinomycin D result in augmentation of their sensitivity to cytolysis by resident and activated macrophages.