Oncotarget

Research Papers:

Molecular responses to therapeutic proteasome inhibitors in multiple myeloma patients are donor-, cell type- and drug-dependent

Eleni-Dimitra Papanagnou, Evangelos Terpos, Efstathios Kastritis, Issidora S. Papassideri, Ourania E. Tsitsilonis, Meletios A. Dimopoulos _ and Ioannis P. Trougakos

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Oncotarget. 2018; 9:17797-17809. https://doi.org/10.18632/oncotarget.24882

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Abstract

Eleni-Dimitra Papanagnou1, Evangelos Terpos2, Efstathios Kastritis2, Issidora S. Papassideri1, Ourania E. Tsitsilonis3, Meletios A. Dimopoulos2 and Ioannis P. Trougakos1

1Department of Cell Biology and Biophysics, Faculty of Biology, National and Kapodistrian University of Athens, 15784 Athens, Greece

2Department of Clinical Therapeutics, School of Medicine, National and Kapodistrian University of Athens, 11528 Athens, Greece

3Department of Animal and Human Physiology, Faculty of Biology, National and Kapodistrian University of Athens, 15784 Athens, Greece

Correspondence to:

Meletios A. Dimopoulos, email: [email protected]

Ioannis P. Trougakos, email: [email protected]

Keywords: bortezomib; cancer; carfilzomib; multiple myeloma; proteasome

Received: July 14, 2017    Accepted: March 06, 2018    Published: April 03, 2018

ABSTRACT

Proteasome is central to proteostasis network functionality and its over-activation represents a hallmark of advanced tumors; thus, its selective inhibition provides a strategy for the development of novel antitumor therapies. In support, proteasome inhibitors, e.g. Bortezomib or Carfilzomib have demonstrated clinical efficacy against hematological cancers. Herein, we studied proteasome regulation in peripheral blood mononuclear cells and erythrocytes isolated from healthy donors or from Multiple Myeloma patients treated with Bortezomib or Carfilzomib. In healthy donors we found that peripheral blood mononuclear cells express higher, as compared to erythrocytes, basal proteasome activities, as well as that proteasome activities decline during aging. Studies in cells isolated from Multiple Myeloma patients treated with proteasome inhibitors revealed that in most (but, interestingly enough, not all) patients, proteasome activities decline in both cell types during therapy. In peripheral blood mononuclear cells, most proteostatic genes expression patterns showed a positive correlation during therapy indicating that proteostasis network modules likely respond to proteasome inhibition as a functional unit. Finally, the expression levels of antioxidant, chaperone and aggresomes removal/autophagy genes were found to inversely associate with patients’ survival. Our studies will support a more personalized therapeutic approach in hematological malignancies treated with proteasome inhibitors.


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