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Osteogenic Differentiation In Vitro of Human Osteoblasts Is Associated with Only Slight Shift in Their Proteomics Profile

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Abstract

Fracture healing is a complex process in which the periosteum and endosteum become the main sources of osteoblast progenitor cells. However, cellular mechanisms and signaling cascades underlying the early stages of osteoblast progenitors differentiation in adult bone are still not well understood. Therefore, we performed shotgun proteomics analysis of primary culture of isolated human osteoblasts from femur of adult donors in undifferentiated conditions and on the fifth day of osteogenic differentiation in vitro. This is an early timepoint in which we have observed no extracellular matrix mineralization yet. 1612 proteins identified with at least two unique peptides were included in proteomics analysis. Data are available via ProteomeXchange with identifier PXD033697. Despite the fact, that matrix mineralization starts only after induction of osteogenic differentiation, we revealed unexpectedly weak physiological shift associated with a decrease of cells proliferative activity and changes in proteins involved in extracellular matrix secretion and organization. We demonstrated that osteoblasts were positive for markers of later osteogenic differentiation stages during standard cultivation: osteopontin, osteocalcin, BMP-2/4 and RUNX2. Therefore, further differentiation required for matrix mineralization needs minimal physiological changes.

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ACKNOWLEDGMENTS

Shotgun proteomics were performed in the research center «Molecular and cell technologies» of St. Petersburg State University Research Park.

Funding

The work was supported by the Russian Science Foundation (RSF), research grant no. 18-14-00152.

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Authors and Affiliations

Authors

Contributions

Conceptualization, A.A.L.; methodology, I.A.K., A.A.L., A.B.M.; software, I.A.K., A.A.L.; validation, A.A.L., D.S.K., A.B.M.; formal analysis: I.A.K.; investigation, I.A.K., D.S.K., B.R.Z., E.S.G., R.M.T., S.A.B., A.P.S., V.V.K.; resources, A.A.L., A.B.M.; data curation, I.A.K., D.S.K.; writing—original draft preparation, I.A.K.; review and editing, A.A.L. and A.B.M.; visualization, E.S.G., I.A.K.; supervision, A.A.L., A.B.M.; project administration, A.B.M.; funding acquisition, A.A.L., A.B.M. All authors have read and agreed to the published version of the manuscript.

Corresponding author

Correspondence to A. A. Lobov.

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Conflict of interest. The authors declare no conflicts of interest.

Statement of compliance with standards of research involving humans as subjects. All procedures performed in the study involving human beings complied with the ethical standards of the institutional and/or national research ethics committee and the 1964 Helsinki Declaration and its subsequent changes or comparable ethical standards. An informed written consent was obtained from each of the participants enrolled in the study.

Additional information

Abbreviations: DAVID—database for Aanotation, visualization and integrated discovery, DMEM—Dulbecco’s modified Eagle medium; ECM—extracellular matrix, FBS—fetal bovine serum, FDR—false discovery rate; GO BP—gene ontology biological process, MSC—mesenchymal stem cells, PBS—phosphate-buffered saline, PCA—principal component analysis, sPLS-DA—sparse partial least squares discriminant analysis, VEGF— vascular endothelial growth factors.

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Khvorova, I.A., Kostina, D.A., Zainullina, B.R. et al. Osteogenic Differentiation In Vitro of Human Osteoblasts Is Associated with Only Slight Shift in Their Proteomics Profile. Cell Tiss. Biol. 16, 540–546 (2022). https://doi.org/10.1134/S1990519X22060025

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