Possible Role for External Environmental Stimuli in Nasopharyngeal NK/T-Cell Lymphomas in the Northeast of China with EBV Infection-Related Autophagic Cell Death : A Pathoepidemiological Analysis
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概要
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This study examined the relationship between external environmental factors and Epstein-Barr virus (EBV) infection in nasal natural killer (NK)/T-cell lymphomagenesis. Archival paraffin sections from 134 cases of nasopharyngeal lymphomas in the northeast of China were investigated by in situ hybridization of EBV-encoded small RNA-1 (EBER-1) and by immunohistochemistry of the status of programmed cell death (PCD). The cases examined included 74 (55.2%) cases of NK/T-cell lymphomas (NKTCL) in T-cell and NK-cell neoplasms as well as 32 (23.9%) cases of B-cell neoplasms (B-MLs) and 9 (6.7%) cases of carcinomas. These cases indicated a significant dominant occurrence of NKTCL in the nasal cavity and of B-MLs in the pharynx. Many EBV-associated NKTCLs were seen in the nasopharynx, all three cases of EBV-associated B-MLs were in the nasal cavity and all three cases of EBV-associated carcinomas were only seen in the pharynx. The low number of NKTCL cases showing little or no EBV association, together with the existence of EBER-1-free lymphoma cells in EBV-associated NKTCLs, suggested EBV-related lymphoma cell expansion during lymphomagenesis. Peculiar necrosis, frequently observed in NKTCLs, was due to accelerated PCD. This PCD was autophagic cell death as judged by labeling of Beclin-1 and LC3, which possibly occurred due to EBV infection, when apoptosis was suppressed by survivin. Very minute squamous carcinomas, observed in 10 of 23 cases of NKTCLs with residual epithelia that were survivin-positive but not EBV-associated suggested that carcinogenesis occurred before lymphomagenesis. These data suggest that external environmental oncogenic factors initiate nasopharyngeal carcinomas and lymphomas whereas EBV infection promotes them. [J Clin Exp Hematopathol 49(2) : 97-108, 2009]
- 2009-11-01
著者
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EIZURU Yoshito
Division of Persistent & Oncogenic Viruses, Center for Chronic Disease, Faculty of Medicine, Kagoshi
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JIA Xinshan
Department of Pathology, China Medical University
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Eizuru Yoshito
Division Of Oncogenic And Persistent Viruses Center For Chronic Viral Diseases Kagoshima University
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Eizuru Yoshito
Division Of Persistent & Oncogenic Viruses Center For Chronic Viral Diseases Department Of Infec
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Matsuyama Takami
Division Of Immunology Department Of Infection And Immunity Graduate School Of Medical And Dental Sc
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Wang Jia
Division Of Persistent & Oncogenic Viruses Center For Chronic Viral Diseases Department Of Infec
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Hasui K
Division Of Persistent & Oncogenic Viruses Center For Chronic Viral Diseases Department Of Infec
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HASUI Kazuhisa
Division of Persistent & Oncogenic Viruses, Center for Chronic Viral Diseases, Department of Infecti
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Jia Xinshan
Department Of Pathology China Medical University
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Hasui Kazuhisa
Division of Immunology, Department of Infection and Immunity, Institute Research Center (Health Research Course), Kagoshima University Graduate School of Medical and Dental Sciences
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Wang Jia
Division of Immunology, Department of Infection and Immunity, Institute Research Center (Health Research Course), Kagoshima University Graduate School of Medical and Dental Sciences
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