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Blood, 15 March 2005, Vol. 105, No. 6, pp. 2510-2518.
Prepublished online as a Blood First Edition Paper on November 30, 2004; DOI 10.1182/blood-2004-08-3052.
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NEOPLASIA
Inhibiting primary effusion lymphoma by lentiviral vectors encoding short hairpin RNA
Andrew Godfrey,
John Anderson,
Antigoni Papanastasiou,
Yasu Takeuchi, and
Chris Boshoff
From the Cancer Research United Kingdom Viral Oncology Group, Wolfson Institute for Biomedical Research; Unit of Molecular Haematology and Cancer Biology, Institute of Child Health; and Windeyer Institute for Medical Sciences, University College London, London, United Kingdom.
We use lentiviral-delivered RNA interference (RNAi) to inhibit the growth of a model of primary effusion lymphoma (PEL) in vitro and in vivo. RNAi is a phenomenon allowing the sequence-specific targeting and silencing of exogenous and endogenous gene expression and is being applied to inhibit viral replication both in vitro and in vivo. We show that silencing of genes believed to be essential for the Kaposi sarcoma-associated herpesvirus (KSHV) latent life cycle (the oncogenic cluster) has a varied effect in PEL cell lines cultured in vitro, however, concomitant silencing of the viral cyclin (vcyclin) and viral FLICE (Fas-associating protein with death domain-like interleukin-1 -converting enzyme) inhibitory protein (vFLIP) caused efficient apoptosis in all PEL lines tested. We demonstrate that in a murine model of PEL, lentiviral-mediated RNA interference both inhibits development of ascites and can act as a treatment for established ascites. We also show that the administered lentiviral vectors are essentially limited to the peritoneal cavity, which has advantages for safety and dosage in a therapeutic setting. This shows the use of lentiviral-mediated RNA interference in vivo as a potential therapeutic against a virally driven human cancer.
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