» Articles » PMID: 39489938

Polyclonal Regeneration of Mouse Bone Marrow Endothelial Cells After Irradiative Conditioning

Abstract

Bone marrow endothelial cells (BM-ECs) are the essential components of the BM niche and support the function of hematopoietic stem cells (HSCs). However, conditioning for HSC transplantation causes damage to the recipients' BM-ECs and may lead to transplantation-related morbidity. Here, we investigated the cellular and clonal mechanisms of BM-EC regeneration after irradiative conditioning. Using single-cell RNA sequencing, imaging, and flow cytometry, we revealed how the heterogeneous pool of BM-ECs changes during regeneration from irradiation stress. Next, we developed a single-cell in vitro clonogenic assay and demonstrated that all EC fractions hold a high potential to reenter the cell cycle and form vessel-like structures. Finally, we used Rainbow mice and a machine-learning-based model to show that the regeneration of BM-ECs after irradiation is mostly polyclonal and driven by the broad fraction of BM-ECs; however, the cell output among clones varies at later stages of regeneration.

References
1.
Li X, Hu Z, Jorgenson M, Wingard J, Slayton W . Bone marrow sinusoidal endothelial cells undergo nonapoptotic cell death and are replaced by proliferating sinusoidal cells in situ to maintain the vascular niche following lethal irradiation. Exp Hematol. 2008; 36(9):1143-1156. DOI: 10.1016/j.exphem.2008.06.009. View

2.
Chen E, Tan C, Kou Y, Duan Q, Wang Z, Meirelles G . Enrichr: interactive and collaborative HTML5 gene list enrichment analysis tool. BMC Bioinformatics. 2013; 14:128. PMC: 3637064. DOI: 10.1186/1471-2105-14-128. View

3.
Tikhonova A, Dolgalev I, Hu H, Sivaraj K, Hoxha E, Cuesta-Dominguez A . The bone marrow microenvironment at single-cell resolution. Nature. 2019; 569(7755):222-228. PMC: 6607432. DOI: 10.1038/s41586-019-1104-8. View

4.
Szade K, Gulati G, Chan C, Kao K, Miyanishi M, Marjon K . Where Hematopoietic Stem Cells Live: The Bone Marrow Niche. Antioxid Redox Signal. 2017; 29(2):191-204. PMC: 6016729. DOI: 10.1089/ars.2017.7419. View

5.
Helker C, Eberlein J, Wilhelm K, Sugino T, Malchow J, Schuermann A . Apelin signaling drives vascular endothelial cells toward a pro-angiogenic state. Elife. 2020; 9. PMC: 7567607. DOI: 10.7554/eLife.55589. View