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The roles that blood vessels play in the maintenance of organs and tissues in addition to the delivery of oxygen and nutrients are being gradually clarified. The maintenance of tissue-specific organ stem cells, such as hematopoietic and neuronal stem cells, is supported by endothelial cells (ECs), which represent an important component of the stem cell niche. The maintenance of organogenesis, for example, osteogenesis and liver generation/regeneration, is supported by molecules referred to as "angiocrine signals" secreted by EC. The mechanisms responsible for the well-known functions of blood vessels, such as thermoregulation and metabolism, especially removal of local metabolites, have now been determined at the molecular level. Following the development of single-cell genetic analysis, blood cell heterogeneity, especially of mural cell populations, has been established and tissue-specific blood vessel formation and function are now also understood at the molecular level. Among the heterogeneous populations of ECs, it seems that a stem cell population with the ability to maintain the production of ECs long-term is present in pre-existing blood vessels. Neovascularization by therapeutic angiogenesis yields benefits in many diseases, not only ischemic disease but also metabolic disease and other vascular diseases. Therefore, vascular endothelial stem cells should be considered to use in vascular regeneration therapy.

Discovery of a Vascular Endothelial Stem Cell (VESC) Population Required for Vascular Regeneration and Tissue Maintenance