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Journal Article
Research Support, Non-U.S. Gov't
Epstein-Barr virus, B cell lymphoproliferative disease, and SCID mice: modeling T cell immunotherapy in vivo.
Journal of Medical Virology 2011 September
Epstein-Barr virus (EBV)-associated post-transplant lymphoproliferative disease (PTLD) arises in up to 10% of organ transplant recipients and is fatal in ∼50% of cases. PTLD can be modeled in SCID mice using EBV+ve human B lymphoblastoid cell lines (BLCLs), and the current study investigated intraperitoneal (ip) inoculation of such animals in experiments which assessed the effect of EBV-specific cytotoxic T lymphocytes (CTLs) and cytokines on PTLD growth. Ip transfer of one dose of autologous CTLs, or CD8-enriched T cells, into ip BLCL-inoculated animals significantly delayed tumor development (P = 0.001) and prevented tumor formation in a significant proportion (40%) of mice (P = 0.001). A combination of interleukin (IL)2, 7, and 15 conditioning of CTLs prior to ip injection significantly delayed ip BLCL-derived tumor formation in vivo when compared to CTLs expanded in vitro using only IL2 (P = 0.04) and prevented tumor outgrowth in a significant proportion (60%) of mice (P = 0.02). Daily ip IL2 dosing of ip CTL-inoculated mice significantly delayed tumor development in vivo (P = 0.004) and prevented tumor outgrowth in a significant proportion (78%) of mice (P = 0.02) when compared to animals dosed with vehicle only. In SCID mice, autologous CTLs, and CD8-enriched T cells, have significant capacity to hinder development of PTLD-like tumors. Whilst studies are needed to delineate the role of cytokine conditioning and CD4-enriched T cells, the results suggest that IL2 plays a key role in supporting CTL funtion in vivo.
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