Abstract
Stem/progenitor cells (SPCs) have been implicated to participate in vascular repair. However, the exact role of SPCs in endothelial repair of large vessels still remains controversial. This study aimed to delineate the cellular heterogeneity and possible functional role of endogenous vascular SPCs in large vessels. Using single-cell RNA-sequencing (scRNA-seq) and genetic lineage tracing mouse models, we uncovered the cellular heterogeneity of SPCs, i.e., c-Kit+ cells in the mouse aorta, and found that endogenous c-Kit+ cells acquire endothelial cell fate in the aorta under both physiological and pathological conditions. While c-Kit+ cells contribute to aortic endothelial turnover in the atheroprone regions during homeostasis, recipient c-Kit+ cells of nonbone marrow source replace both luminal and microvessel endothelial cells in transplant arteriosclerosis. Single-cell pseudotime analysis of scRNA-seq data and in vitro cell experiments suggest that vascular SPCs display endothelial differentiation potential and undergo metabolic reprogramming during cell differentiation, in which AKT/mTOR-dependent glycolysis is critical for endothelial gene expression. These findings demonstrate a critical role for c-Kit lineage cells in aortic endothelial turnover and replacement, and may provide insights into therapeutic strategies for vascular diseases.
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Abbreviations
- 2-DG:
-
2-Deoxyglucose
- ECs:
-
Endothelial cells
- ECAR:
-
Extracellular acidification rate
- MSC:
-
Mesenchymal stromal cell
- NK:
-
Natural killer
- OCR:
-
Oxygen consumption rate
- RBC:
-
Red blood cells
- Sca-1/Ly6a:
-
Stem cell antigen-1/lymphocyte antigen 6 complex, locus A
- scRNA-seq:
-
Single-cell RNA-sequencing
- SMCs:
-
Smooth muscle cells
- SPCs:
-
Stem/progenitor cells
- TCA cycle:
-
Tricarboxylic acid cycle
- tdTomato/tdT:
-
Tandem dimer Tomato
- UMAP:
-
Uniform manifold approximation and projection
- VEGF:
-
Vascular endothelial growth factor
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Acknowledgements
This work was supported by grants from British Heart Foundation (RG/14/6/31144), National Natural Science Foundation of China (81220108004, 81570249, 81930010, 81870206, 91339102, 91639302, 91539103, and 31830039), Zhejiang Provincial Natural Science Foundation (LD18H020001) and Royal Society-Newton Advanced Fellowship (NA170109). Some panels in the figure were produced using Servier Medical Art under a Creative Commons Attribution 3.0 Unported License.
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Deng, J., Ni, Z., Gu, W. et al. Single-cell gene profiling and lineage tracing analyses revealed novel mechanisms of endothelial repair by progenitors. Cell. Mol. Life Sci. 77, 5299–5320 (2020). https://doi.org/10.1007/s00018-020-03480-4
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DOI: https://doi.org/10.1007/s00018-020-03480-4