Abstract
To investigate in a murine model the mechanism by which micrometastatic melanoma, which spreads from the eye to the liver, is controlled by interferon (IFN)-alpha 2b. Major histocompatibility (MHC) class I antigen (H-2, all haplotypes) expression in three murine melanoma cell lines (Queens, B16LS9, B16F10) was determined by flow cytometric immunophenotyping. The cell lines were heterotopically inoculated into the posterior compartments (PCs) of C57Bl/6 mice, and the mice were given intraperitoneal (IP) injections of IFN-alpha 2b or PBS for 1 or 4 days before enucleation at 7 days after inoculation. Groups of mice were made NK deficient or depleted with subcutaneous (s.c.) injection of anti-asialo GM1. The mice were killed at 28 days or 56 days (survival experiment) after inoculation, and the number of hepatic micrometastases was histologically determined. NK cells were isolated from the spleen and liver at necropsy, and propidium iodide labeled target-specific cytolysis was determined by flow cytometry. The micrometastases were evaluated for apoptosis and proliferation with TUNEL and MIB1 immunostaining, respectively, and TUNEL-to-MIB1 ratios were determined. Hepatic NK cells were immunostained with CD49b. MHC class I antigen w...Continue Reading
Citations
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