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Rapid induction and creation of functional vascular networks is essential for the success of treating ischemic tissues. The formation of mature and functional vascular networks requires the cooperation of endothelial cells (ECs) and perivascular cells. In the study, we used a thermo-responsive hydrogel system to fabricate core-shell cell bodies composed of cord-blood mesenchymal stem cells (cbMSCs) and human umbilical vascular ECs (HUVECs) for functional vasculogenesis. When seeded on Matrigel, the shelled HUVECs attempted to interact and communicate vigorously with the cored cbMSCs initially. Subsequently, HUVECs migrated out and formed tubular structures; cbMSCs were observed to coalesce around the HUVEC-derived tubes. With time progressing, the tubular networks continued to expand without regression, indicating that cbMSCs might function as perivascular cells to stabilize the nascent networks. In the in vivo study, cbMSC/HUVEC bodies were embedded in Matrigel and implanted subcutaneously in nude mice. At day 7, visible blood-filled vessels were clearly identified within the implant containing cbMSC/HUVEC bodies, indicating that the formed vessels anastomosed with the host vasculature. The cored cbMSCs were stained positive for smooth muscle actin, suggesting that they underwent smooth muscle differentiation and formed microvessels with the shelled HUVECs, as the role of perivascular cells. These data confirm that the formation of mature vessels requires heterotypic cooperation of HUVECs and MSCs. This study provides a new strategy for therapeutic vasculogenesis, by showing the feasibility of using cbMSC/HUVEC bodies to create functional vascular networks.
The carbonate/phosphate ratio impacts bone mechanical properties and in very old subjects can be associated with deterioration in the structural and mechanical material properties of bone (7, 10, 20). For example, carbonate substitution (carbonate/phosphate ratio) was significantly higher in skeletally mature, old murine bones compared to skeletally mature, young murine bones, and the carbonate/phosphate ratio positively correlated with bone plasticity (deformation) index (20). McCreadie et al. (9) found a greater carbonate/phosphate ratio in the iliac crest cortical bone from women (>50 years old) with osteoporosis when measured by Raman spectrometry and concluded that the carbonate/phosphate ratio was an important determinant in the occurrence of osteoporotic fracture (9). 59ce067264