4.7 Article

Selective inhibition of chymotrypsin-like activity of the immunoproteasome and constitutive proteasome in Waldenstrom macroglobulinemia

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BLOOD
卷 115, 期 20, 页码 4051-4060

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AMER SOC HEMATOLOGY
DOI: 10.1182/blood-2009-09-243402

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  1. International Waldenstrom Macroglobulinemia Foundation (IWMF)
  2. [R21 1R21CA126119-01]

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Proteasome inhibition represents a valid antitumor approach and its use has been validated in Waldenstrom macroglobulinemia (WM), where bortezomib has been successfully tested in clinical trials. Nevertheless, a significant fraction of patients relapses, and many present toxicity due to its off-target effects. Selective inhibition of the chymotrypsin-like (CT-L) activity of constitutive proteasome 20S (c20S) and immunoproteasome 20S (i20S) represents a sufficient and successful strategy to induce antineoplastic effect in hematologic tumors. We therefore studied ONX0912, a novel selective, irreversible inhibitor of the CT-L activity of i20S and c20S. Primary WM cells express higher level of i20S compared with c20S, and that ONX0912 inhibited the CT-L activity of both i20S and c20S, leading to induction of toxicity in primary WM cells, as well as of apoptosis through c-Jun N-terminal kinase activation, nuclear factor kappa B (NF-kappa B) inhibition, caspase cleavage, and initiation of the unfolded protein response. Importantly, ONX0912 exerted toxicity in WM cells, by reducing bone marrow (BM)derived interleukin-6 (IL-6) and insulinlike growth factor 1 (IGF-1) secretion, thus inhibiting BM-induced p-Akt and phosphorylated extracellular signal-related kinase (p-ERK) activation in WM cells. These findings suggest that targeting i20S and c20S CT-L activity by ONX0912 represents a valid antitumor therapy in WM. (Blood. 2010; 115(20): 4051-4060)

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