Pharmacologic targeting of the p62 ZZ domain enhances both anti-tumor and bone-anabolic effects of bortezomib in multiple myeloma

Autor: Silvia Marino, Daniela N. Petrusca, Ryan T. Bishop, Judith L. Anderson, Hayley M. Sabol, Cody Ashby, Justin H. Layer, Annamaria Cesarano, Utpal P. Davé, Fabiana Perna, Jesus Delgado-Calle, John M. Chirgwin, G. David Roodman
Jazyk: angličtina
Rok vydání: 2023
Předmět:
Zdroj: Haematologica, Vol 109, Iss 5 (2023)
Druh dokumentu: article
ISSN: 0390-6078
1592-8721
DOI: 10.3324/haematol.2023.283787
Popis: Multiple myeloma (MM) is a malignancy of plasma cells whose antibody secretion creates proteotoxic stress relieved by the N-end rule pathway, a proteolytic system that degrades N-arginylated proteins in the proteasome. When the proteasome is inhibited, protein cargo is alternatively targeted for autophagic degradation by binding to the ZZ-domain of p62/ sequestosome-1. Here, we demonstrate that XRK3F2, a selective ligand for the ZZ-domain, dramatically improved two major responses to the proteasome inhibitor bortezomib (Btz) by increasing: i) killing of human MM cells by stimulating both Btz-mediated apoptosis and necroptosis, a process regulated by p62; and ii) preservation of bone mass by stimulating osteoblast differentiation and inhibiting osteoclastic bone destruction. Co-administration of Btz and XRK3F2 inhibited both branches of the bimodal N-end rule pathway exhibited synergistic anti-MM effects on MM cell lines and CD138+ cells from MM patients, and prevented stromal-mediated MM cell survival. In mice with established human MM, co-administration of Btz and XRK3F2 decreased tumor burden and prevented the progression of MM-induced osteolytic disease by inducing new bone formation more effectively than either single agent alone. The results suggest that p62-ZZ ligands enhance the anti- MM efficacy of proteasome inhibitors and can reduce MM morbidity and mortality by improving bone health.
Databáze: Directory of Open Access Journals
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