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- W2017371347 abstract "The expression of the HLA class I molecules on the cell surface was investigated in hepatocellular carcinoma (HCC) cell lines using complement-mediated cytotoxicity (CMC) and flow cytometric analysis. Although HLA-A antigens were detected by CMC in all cell lines tested, HLA-B and -C antigens were not detectable in six of seven HCC cell lines. These results were also confirmed by flow cytometric analysis focusing on HLA-Bw4 and Bw6 public antigens. Furthermore, complementary DNA (cDNA) from each cell line was tested for the expression of HLA-A, - B, -C and the transporter associated with antigen processing genes (TAP1 and TAP2). Two cell lines showed a reduced level of one or both of the TAP messenger RNAs (mRNAs), and one of these showed a reduction of HLA-B and -C gene expression as well, but the others had detectable mRNA levels. These results demonstrate that hepatocellular carcinoma cell lines tested in the current study lose or decrease the expression of HLA-B and -C alleles on the cell surface, even though mRNA encoding these alleles is present, suggesting that the loss of the HLA molecules might be caused by posttranscriptional events or failure to transport and load peptides necessary for HLA expression. The selective loss of HLA-B and -C, but not -A, molecules (which also excludes a β2-microglobulin defect) is intriguing, and may be attributable to the ability of some of the HLA-A molecules to load signal peptides not requiring TAP transport, or to natural selection of HLA-B or -C locus- specific immune surveillance." @default.
- W2017371347 created "2016-06-24" @default.
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- W2017371347 date "1996-05-01" @default.
- W2017371347 modified "2023-10-17" @default.
- W2017371347 title "Expression of HLA class I molecules and the transporter associated with antigen processing in hepatocellular carcinoma" @default.
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- W2017371347 doi "https://doi.org/10.1002/hep.510230537" @default.
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