Journal
JOURNAL OF CELLULAR AND MOLECULAR MEDICINE
Volume 24, Issue 16, Pages 9428-9438Publisher
WILEY
DOI: 10.1111/jcmm.15605
Keywords
bortezomib; cell cycle; mesenchymal stem cells; p21(Cip1); p27(Kip1); Xbp1s
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Funding
- National Natural Science Foundation of China [81570192, 81372534]
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Mesenchymal stem cells (MSCs) are multipotent cells capable of differentiating into a variety of cell types. Bortezomib, the first approved proteasome inhibitor used for the treatment of multiple myeloma (MM), has been shown to induce osteoblast differentiation, making it beneficial for myeloma bone disease. In the present study, we aimed to investigate the effects and underlying mechanisms of bortezomib on the cell cycle during osteogenic differentiation. We confirmed that low doses of bortezomib can induce MSCs towards osteogenic differentiation, but high doses are toxic. In the course of bortezomib-induced osteogenic differentiation, we observed cell cycle exit characterized by G(0)/G(1)phase cell cycle arrest with a significant reduction in cell proliferation. Additionally, we found that the cell cycle exit was tightly related to the induction of the cyclin-dependent kinase inhibitors p21(Cip1)and p27(Kip1). Notably, we further demonstrated that the up-regulation of p21(Cip1)and p27(Kip1)is transcriptionally dependent on the bortezomib-activated ER stress signalling branch Ire1 alpha/Xbp1s. Taken together, these findings reveal an intracellular pathway that integrates proteasome inhibition, osteogenic differentiation and the cell cycle through activation of the ER stress signalling branch Ire1 alpha/Xbp1s.
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