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Expansion in scid mice of Epstein–Barr virus-associated post-transplantation lymphoproliferative disease biopsy material

Laboratory for Clinical and Molecular Virology, University of Edinburgh, Summerhall, Edinburgh EH9 1QH, UK¹
Department of Infectious and Tropical Diseases, London School of Hygiene & Tropical Medicine, Keppel Street, London WC1E 7HT, UK²
Leukaemia Research Fund Virus Centre, University of Glasgow, Bearsden, Glasgow G61 1QH, UK³

Author for correspondence: Dorothy Crawford. Fax +44 131 650 3711. e-mail d.crawford{at}ed.ac.uk

Post-transplant lymphoproliferative disease (PTLD) biopsy material is rarely available in adequate quantity for research. Therefore, the present study was designed to expand biopsy material in scid mice. Epstein–Barr virus (EBV)+ve PTLD samples from five transplant patients were established in scid mice. PCR analysis of immunoglobulin gene rearrangements demonstrated that four of the five biopsies (80%) gave rise to scid tumours which represented the original tumour cell clones. Immunophenotyping showed that these four biopsies (and all scid tumours) expressed all EBV latent genes and a B lymphoblast phenotype; 26% T cells were found in the biopsy material whereas scid tumours showed a paucity of T lymphocytes. RT–PCR analysis revealed expression of IL-2, -4, -6, -10 and IFN- in all tumour material, suggesting key roles for these factors in tumour growth. The results show that EBV+ve PTLD material can be expanded in scid mice giving rise to quantities of homogeneous malignant tissue sufficient for research studies.

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