Abstract
Due to the accumulation of reactive oxygen species (ROS) and heightened activity of osteoclasts, postmenopausal osteoporosis could cause severe pathological bone destruction. Protein disulfide isomerase (PDI), an endoplasmic prototypic thiol isomerase, plays a central role in affecting cellular redox state. To test whether suppression of PDI could inhibit osteoclastogenesis through cellular redox regulation, bioinformatics network analysis was performed on the causative genes, followed by biological validation on the osteoclastogenesis in vitro and ovariectomy (OVX) mice model in vivo. The analysis identified PDI as one of gene targets for postmenopausal osteoporosis, which was positively expressed during osteoclastogenesis. Therefore, PDI expression inhibitor and chaperone activity inhibitor were used to verify the effects of PDI inhibitors on osteoclastogenesis. Results demonstrated that PDI inhibitors could reduce osteoclast number and inhibit resorption function via suppression on osteoclast marker genes. The mechanisms behind the scenes were the PDI inhibitors-caused intracellular ROS reduction via enhancement of the antioxidant system. Micro-CT and histological results indicated PDI inhibitors could effectively alleviate or even prevent bone loss in OVX mice. In conclusion, our findings unveiled the suppressive effects of PDI inhibitors on osteoclastogenesis by reducing intracellular ROS, providing new therapeutic options for postmenopausal osteoporosis.
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The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.
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Acknowledgements
Funding
National Natural Science Foundation of China,82100936,81972056,Natural Science Foundation of Shandong Province,ZR2021QH077,Taishan Scholar Foundation of Shandong Province,tsqnz20221170
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All authors contributed to the study conception and design. YW and TY conceived the experiments, analyzed data, and wrote the manuscript. HJW and HYL collected data from databases and performed bioinformatics analysis. QM and CGF participated in the experiments. ZQL and SS designed experiments and polished the manuscript. All authors approved the final version.
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All experiments involving mice were performed following the protocol approved by the Institutional Animal Care and Use Committee (IACUC) of the Shandong Provincial Hospital Affiliated to Shandong First Medical University (Shandong, China; NSFC: no. 2021–038).
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10753_2023_1933_MOESM1_ESM.xlsx
Supplementary file1: Top 1500 genes retrieved from the GeneCards using “osteoporosis”, “osteoclast”, “estrogen”, “fracture” and “oxidative stress” as keywords. (XLSX 91 KB)
10753_2023_1933_MOESM2_ESM.xlsx
Supplementary file2: Top 100 associated gene targets of drugs retrieved from the CTD using “osteoporosis” as the keyword. (XLSX 14 KB)
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Wang, Y., Yuan, T., Wang, H. et al. Inhibition of Protein Disulfide Isomerase Attenuates Osteoclast Differentiation and Function via the Readjustment of Cellular Redox State in Postmenopausal Osteoporosis. Inflammation 47, 626–648 (2024). https://doi.org/10.1007/s10753-023-01933-z
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DOI: https://doi.org/10.1007/s10753-023-01933-z