The novel β2-selective proteasome inhibitor LU-102 decreases phosphorylation of I kappa B and induces highly synergistic cytotoxicity in combination with ibrutinib in multiple myeloma cells.

Publication

The novel β2-selective proteasome inhibitor LU-102 decreases phosphorylation of I kappa B and induces highly synergistic cytotoxicity in combination with ibrutinib in multiple myeloma cells.

Journal Paper/Review - Jun 23, 2015

Kraus Johannes, Kraus Marianne, Liu Nora, Besse Lenka, Bader Jürgen, Geurink Paul P, de Bruin Gerjan, Kisselev Alexei F, Overkleeft Herman, Driessen Christoph

Citation

Kraus J, Kraus M, Liu N, Besse L, Bader J, Geurink P, de Bruin G, Kisselev A, Overkleeft H, Driessen C. The novel β2-selective proteasome inhibitor LU-102 decreases phosphorylation of I kappa B and induces highly synergistic cytotoxicity in combination with ibrutinib in multiple myeloma cells. Cancer Chemother Pharmacol 2015; 76:383-96.

Type

Journal Paper/Review (English)

Journal

Cancer Chemother Pharmacol 2015; 76

Publication Date

Jun 23, 2015

Issn Electronic

1432-0843

Pages

383-96

Brief description/objective

Proteasome-inhibiting drugs (PI) are gaining importance in hematologic oncology. The proteasome carries three proteolytically active subunits (β1, β2, β5). All established PI (bortezomib and carfilzomib), as well as experimental drugs in the field (dalanzomib, oprozomib, and ixazomib), by design target the rate-limiting β5 subunit. It is unknown whether β2-selective proteasome inhibition can also be exploited toward anticancer treatment. Combining PI with the pan B-cell-directed Bruton tyrosine kinase inhibitor ibrutinib appears a natural option for future improved treatment of multiple myeloma (MM) and B-cell lymphomas. However, bortezomib induces phosphorylation of IκB and activation of NF-κB in MM cells, while ibrutinib inhibits the IκB/NF-κB axis, suggesting antagonistic signaling. A β2-selective proteasome inhibitor may lack such antagonistic signaling effects.