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Antigen presenting phenotype of Hodgkin Reed-Sternberg cells: analysis of the HLA class I processing pathway and the effects of interleukin-10 on epstein-barr virus-specific cytotoxic T-cell recognition

Antigen presenting phenotype of Hodgkin Reed-Sternberg cells: analysis of the HLA class I processing pathway and the effects of interleukin-10 on epstein-barr virus-specific cytotoxic T-cell recognition

Blood 92(3): 1020-1030

Approximately 40% of Hodgkin's disease (HD) cases in Western countries carry Epstein-Barr virus (EBV) in the malignant Hodgkin-Reed-Sternberg (H-RS) cells. HLA class I-restricted cytotoxic T lymphocytes (CTLs) with specificity for viral antigens expressed in H-RS cells therefore have therapeutic potential. However, a prerequisite for CTL therapy is that the tumor target be capable of processing and presenting endogenously expressed antigens via the transporter associated with antigen processing (TAP)-dependent HLA class I pathway. We have assessed the antigen-presenting phenotype of H-RS cells in two ways. First, immunohistochemical analysis of 38 HD biopsies showed that H-RS cells were uniformly TAP1/TAP2-positive and expressed HLA class I in the majority (18 of 24, 75%) of EBV-positive cases compared with only 4 of 14 (29%) of EBV-negative cases. Second, using a panel of 5 H-RS cell lines, we showed that 4 of 5 could process and present EBV proteins to HLA class I-restricted EBV-specific CTL clones. Others have reported that human interleukin-10 (IL-10), which is expressed by H-RS cells in the majority of EBV-positive HD cases, can abrogate CTL recognition in some circumstances. However, IL-10 pretreatment of the H-RS lines or of the EBV-specific CTLs had no such effect in this system. These results support the possibility that EBV-specific CTLs may be used to treat virus-positive HD.

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Accession: 008172208

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PMID: 9680372

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