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Characterizing dry mass and volume changes in human multiple myeloma cells upon treatment with proteotoxic and genotoxic drugs

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Abstract

Multiple myeloma (MM) is a cancer of terminally differentiated plasma cells. MM remains incurable, but overall survival of patients has progressively increased over the past two decades largely due to novel agents such as proteasome inhibitors (PI) and the immunomodulatory agents. While these therapies are highly effective, MM patients can be de novo resistant and acquired resistance with prolonged treatment is inevitable. There is growing interest in early, accurate identification of responsive versus non-responsive patients; however, limited sample availability and need for rapid assays are limiting factors. Here, we test dry mass and volume as label-free biomarkers to monitor early response of MM cells to treatment with bortezomib, doxorubicin, and ultraviolet light. For the dry mass measurement, we use two types of phase-sensitive optical microscopy techniques: digital holographic tomography and computationally enhanced quantitative phase microscopy. We show that human MM cell lines (RPMI8226, MM.1S, KMS20, and AMO1) increase dry mass upon bortezomib treatment. This dry mass increase after bortezomib treatment occurs as early as 1 h for sensitive cells and 4 h for all tested cells. We further confirm this observation using primary multiple myeloma cells derived from patients and show that a correlation exists between increase in dry mass and sensitivity to bortezomib, supporting the use of dry mass as a biomarker. The volume measurement using Coulter counter shows a more complex behavior; RPMI8226 cells increase the volume at an early stage of apoptosis, but MM.1S cells show the volume decrease typically observed with apoptotic cells. Altogether, this cell study presents complex kinetics of dry mass and volume at an early stage of apoptosis, which may serve as a basis for the detection and treatment of MM cells.

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Acknowledgements

The authors acknowledge the late professor Michael Feld for initiating this research. Some early findings reported in this article were published in the Ph.D. dissertation (MIT, 2011) by Yongjin Sung. The authors thank Professor Marc Kirschner of Harvard Medical School for making available the ceQPM microscope and analytical tools.

Funding

This work was funded by the National Institutes of Health (P41EB015871-33, R01GM026875, ZY, YS; R56AG073341, XL, SO; 5K08CA245100, GB), the National Science Foundation (DBI-0754339, ZY, YS), and Hamamatsu Photonics, Japan, (ZY, YS).

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Authors

Contributions

WC, KCA GB and YS developed the concept; XL, WC, GB and YS designed the experiments; XL, MM, SO, TC, BE, GB and YS performed the experiments; XL, MM, SO, WC, TC, BE, ZY, GB and YS analyzed the data; SMR, ON, CCM, ASS and GB contributed primary samples; ZY and GB secured funding for research; XL, GB and YS wrote the manuscript; all authors read and approved the final version of the manuscript.

Corresponding authors

Correspondence to Giada Bianchi or Yongjin Sung.

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Conflict of interest

OM serves on the advisory committees of Karyopharm, Adaptive Biotechnologies, Takeda, Bristol Myers Squibb (BMS) and GlaxoSmithKline (GSK). CMM has received honoraria and/or serves on the advisory committees of Sanofi, GSK, BMS, Epizyme, Eli Lilly, Janssen and Karyopharm. ASS serves as a consultant for Adaptive Biotechnologies. KCA serves on advisory boards to Takeda, Janssen, Sanofi-Aventis, BMS, Celgene, Gilead, Pfizer, Astrazeneca, Mana Therapeutics, and is a Scientific Founder of OncoPep and C4 Therapeutics. GB received honoraria for consulting from Karyopharm and Pfizer. All other authors declare no conflict of interest.

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Liu, X., Moscvin, M., Oh, S. et al. Characterizing dry mass and volume changes in human multiple myeloma cells upon treatment with proteotoxic and genotoxic drugs. Clin Exp Med 23, 3821–3832 (2023). https://doi.org/10.1007/s10238-023-01124-y

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