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JOURNAL ARTICLE
RESEARCH SUPPORT, N.I.H., EXTRAMURAL
RESEARCH SUPPORT, U.S. GOV'T, P.H.S.
The proteasome inhibitor bortezomib (PS-341) inhibits growth and induces apoptosis in primary effusion lymphoma cells.
Cancer Biology & Therapy 2005 January
The ubiquitin-proteasome pathway is responsible for degrading many critical regulatory proteins involved in immune and inflammatory responses, control of cell growth and apoptosis. Recently, proteasome inhibitors have emerged as promising new therapeutic agents in hematological malignancies. Here we show that Bortezomib (PS-341), a proteasome-inhibitor, inhibits cellular proliferation and induces apoptosis in cell lines derived from Primary Effusion Lymphoma (PEL), a subtype of non-Hodgkin's lymphoma associated with infection by human herpes virus 8 (HHV-8). Bortezomib demonstrated more cytotoxicity against PEL cells than against cell lines derived from multiple myeloma, a disease for which is in current clinical use. Apoptosis induced by Bortezomib was associated with inhibition of the classical and alternative NF-kappaB pathways, upregulation of p53, p21 and p27 and activation of caspase cascade. Finally, treatment of PEL cells with Bortezomib exerted a synergistic or additive cytotoxic effect in combination with chemotherapeutic drugs or TRAIL. Taken together, these findings suggest that Bortezomib represents a promising agent for the treatment of PEL.
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