Aug 1, 1976

Effects of Tumor-like assay conditions, lonizing radiation, and hyperthermia on immune lysis of tumor cells by cytotoxic T-lymphocytes

Cancer Research
J R Harris


Cytotoxic T-lymphocytes (CTL's) harvested from mixed splenic lymphocyte cultures (DBA/2 + C57BL) were tested for their ability to lyse allogeneic P815 mastocytoma cells under various tumor-like assay conditions, with or without previous exposure to ionizing radiation or hyperthermia (43 degrees). There was little or no decrease of immune cytolysis when CTL's were assayed by 51Cr release under tumor-like conditions (plateau-phase target cells, low pH, or anoxia) or after irradiation, but cytolytic activity was greatly reduced when CTL's were exposed to heat; 45 min of hyperthermic treatment decreased activity by greater than or equal to 99% while reducing the apparent cell viability (as indicated by trypan blue exclusion) by only 30%. When the P815 target cells rather than the CTL's were exposed to heat their susceptibility to immune lysis was not affected even after treatment times that were lethal to the tumor cells. Despite the dissimilar heat sensitivities of CTL and P815 cells, the dose-response curves for inhibition of protein synthesis by heat, as indicated by [3H]leucine incorporation, were similar for both cell types: neither the depression of protein synthesis in heated CTL's nor the decreased cytolytic ability of thes...Continue Reading

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Mentioned in this Paper

Severe Combined Immunodeficiency With Sensitivity to Ionizing Radiation
Effects of Radiation
Tumor Lysis Syndrome
Protein Biosynthesis
Cell Survival
Benign Mastocytoma

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