Journal
MABS
Volume 1, Issue 1, Pages 31-40Publisher
TAYLOR & FRANCIS INC
DOI: 10.4161/mabs.1.1.7472
Keywords
mantle cell lymphoma; proteasome inhibition; CD20; survival and death pathways; apoptosis
Categories
Funding
- Leukemia and Lymphoma society
- American Cancer Society
- D. Warren Brown Foundation
- Italian Association Against Leukemia and Lymphoma, section of Bologna (BolognAIL ONLUS)
- [P01 CA95426]
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Mande cell lymphoma. (MCL) is a distinct histologic subtype of B cell non-Hodgkins lymphoma (NHL) associated with an aggressive clinical course. Inhibition of the ubiquitin-proteasome pathway modulates survival and proliferation signals in MCL and has shown clinical benefit in this disease. This has provided rationale for exploring combination regimens with B-cell selective immunotherapies such as rituximab. In this study, we examined the effects of combined treatment with bortezomib and rituximab on patient-derived MCL cell lines (Jeko, Mino, SP53) and tumor samples from patients with MCL where we validate reversible proteasome inhibition concurrent with cell cycle arrest and additive induction of apoptosis. When MCL cells were exposed to single agent bortezomib or combination bortezomib/rituximab, caspase dependent and independent apoptosis was observed. Single agent bortezomib or rituximab treatment of Mino and Jeko cell lines and patient samples resulted in decreased levels of nuclear NF kappa B complex(es) capable of binding p65 consensus oligonudeotides, and this decrease was enhanced by the combination. Constitutive activation of the Akt pathway was also diminished with bortezomib alone or in combination with rituximab. On the basis of in vitro data demonstrating additive apoptosis and enhanced NF kappa B and phosphorylated Akt depletion in MCL with combination bortezomib plus rituximab, a phase II trial of bortezomib-rituximab in patients with relapsed/refractory MCL is underway.
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