Abstract
Interferon has been shown to enhance the ability of nonspecific cytotoxic mononuclear cells to lyse some, but not all, tumor cells. We have examined the effect of recombinant human gamma interferon (rIFNγ) on the cell-mediated cytolysis of tumor target cells derived from continuously cultured lines of small cell carcinoma of the lung (SCCL). Cells from the SCCL lines DMS 44, 53, 79, 92, and 406 were labeled with 51Cr and incubated with normal and rIFNγ-stimulated peripheral blood mononuclear cells for 18 h at 37 °C and tumor cell lysis estimated by measuring 51Cr release. Although cells from certain SCCL lines were good targets for cell mediated cytotoxicity, susceptibility to lysis was heterogenous among the different SCCL lines. DMS 406 and 79 were, on average, maximally lysed, while DMS 44, 53, and 92 showed less susceptibility to lysis by either control or rIFNγ-stimulated effector cells. In addition, although pretreatment with rIFNγ increased the cytolytic capacity of normal peripheral blood mononuclear cells from several different donors, preincubation of the tumor cell lines with rIFNγ resulted in inhibition of cytolysis mediated by both control and IFN-activated effector cells. These findings suggest that although rIFNγ may enhance cell-mediated lysis of SCCL tumor cells, it may also decrease susceptibility to lysis.
Keywords: Peripheral Blood Mononuclear Cell, Tumor Cell Line, Gamma Interferon, Small Cell Carcinoma, Cell Mediate Cytotoxicity
Footnotes
This work was supported by Grants CA 37868, CA 31888, CA31918, CA33852, and AI 19053 awarded by the National Cancer Institute and Institute of Allergy and Infectious Diseases, DHHS. Statistical assistance was provided by Therese Stukel, biostatistician at the Norris Cotton Cancer Center, Hanover, H. H. and supported by Grant CA 23108 from the National Cancer Institute
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