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Blood, 15 December 2005, Vol. 106, No. 13, pp. 4345-4350.
Prepublished online as a Blood First Edition Paper on August 30, 2005; DOI 10.1182/blood-2005-06-2342.


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NEOPLASIA

Transformation of BCR-deficient germinal-center B cells by EBV supports a major role of the virus in the pathogenesis of Hodgkin and posttransplantation lymphomas

Dörte Bechtel, Julia Kurth, Claus Unkel, and Ralf Küppers

From the Institute for Cell Biology (Tumor Research), University of Duisburg-Essen, Essen, Germany; and the Department of Otorhinolaryngology, University of Duisburg-Essen, Essen, Germany.

In classic Hodgkin lymphoma (HL) and posttransplantation lymphoproliferative disease (PTLD), 2 malignancies frequently associated with Epstein-Barr virus (EBV), the tumor cells often appear to derive from B-cell receptor (BCR)–deficient and therefore preapoptotic germinal center (GC) B cells. To test whether EBV can rescue BCR-less GC B cells, we infected human tonsillar CD77+ GC B cells in vitro with EBV. More than 60 monoclonal lymphoblastoid cell lines (LCLs) were established. Among these, 28 cell lines did not express surface immunoglobulin (sIg). Two of the sIg-negative cell lines carry obviously destructive mutations that have been introduced into originally functional VH gene rearrangements during the process of somatic hypermutation. Quantitative reverse transcriptase–polymerase chain reaction (RT-PCR) showed that in most other lines the sIg deficiency was not simply the result of transcriptional down-regulation, but it was rather due to posttranscriptional defects. These findings strongly support the idea that EBV plays a central role in the pathogenesis of classic HL and PTLD by rescuing BCR-deficient, preapoptotic GC B cells from apoptosis, and that EBV infection renders the cells independent from survival signals normally supplied by a BCR. The monoclonal LCLs represent valuable models for early stages of lymphoma development in classic HL and PTLD.


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