An injectable double-network hydrogel for the co-culture of vascular endothelial cells and bone marrow mesenchymal stem cells for simultaneously enhancing vascularization and osteogenesis

2018 ◽  
Vol 6 (47) ◽  
pp. 7811-7821 ◽  
Author(s):  
Congchong Yang ◽  
Bing Han ◽  
Chunling Cao ◽  
Di Yang ◽  
Xiaozhong Qu ◽  
...  

Utilization of a GC/Alg DN hydrogel for the co-culture of BM-MSCs with VECs to promote vascularization and osteogenesis simultaneously.

2019 ◽  
Vol 2019 ◽  
pp. 1-19 ◽  
Author(s):  
Huafang Wang ◽  
Xiaohang Ye ◽  
Haowen Xiao ◽  
Ni Zhu ◽  
Cong Wei ◽  
...  

Protein tyrosine phosphatases (PTPs) act as key regulators in various cellular processes such as proliferation, differentiation, and migration. Our previous research demonstrated that non-receptor-typed PTP21 (PTPN21), a member of the PTP family, played a critical role in the proliferation, cell cycle, and chemosensitivity of acute lymphoblastic leukemia cells. However, the role of PTPN21 in the bone marrow microenvironment has not yet been elucidated. In the study, we explored the effects of PTPN21 on human bone marrow-derived mesenchymal stem cells (BM-MSCs) via lentiviral-mediated overexpression and knock-down of PTPN21 in vitro. Overexpressing PTPN21 in BM-MSCs inhibited the proliferation through arresting cell cycle at the G0 phase but rendered them a higher osteogenic and adipogenic differentiation potential. In addition, overexpressing PTPN21 in BM-MSCs increased their senescence levels through upregulation of P21 and P53 and dramatically changed the levels of crosstalk with their typical target cells including immunocytes, tumor cells, and vascular endothelial cells. BM-MSCs overexpressing PTPN21 had an impaired immunosuppressive function and an increased capacity of recruiting tumor cells and vascular endothelial cells in a chemotaxis transwell coculture system. Collectively, our data suggested that PTPN21 acted as a pleiotropic factor in modulating the function of human BM-MSCs.


2020 ◽  
Author(s):  
Shanhong Fang ◽  
Tianmin He ◽  
Jiarun Jiang ◽  
Yongfeng Li ◽  
Heling Huang ◽  
...  

Abstract Background: Osteonecrosis of femoral head (ONFH) is a common ischemic disease that induces femoral head necrosis. The role of exosomes and miRNA in ONFH has been elucidated, however, whether miRNA-modified exosomes improve the therapy of ONFH is not clear.Methods: We screened ONFH-related miRNAs by RNA sequencing in plasma exosomes of ONFH patients and healthy donors. The key miRNA was overexpressed in bone marrow mesenchymal stem cells (BMSC) exosomes. The regulatory functions of miRNA-modified BMSC exosomes in vascular endothelial cells were illustrated through angiogenesis assay and scratch assay.Results: We identified 9 differently expressed miRNAs (DEmiRNAs) in plasma exosomes between ONFH and healthy groups, with 6 up-regulated and 3 down-regulated miRNAs. Function and pathway analysis revealed DEmiRNAs were primarily involved in angiogenesis, cell migration, focal adhesion. Moreover, miR-150-5p was declined in ONFH exosomes and regulated multiple angiogenesis-related pathways. The miR-150-5p-overexpressed BMSC exosomes were successfully obtained and transported miR-150-5p to endothelial cells. Moreover, the miR-150-5p-modified BMSC exosomes promoted the angiogenesis and migration of endothelial cells.Conclusion: Our results elucidate the exosomal miRNA expression profiles in ONFH, and miR-150-5p-modified BMSC exosomes protect against ONFH by promoting angiogenesis, suggesting a new molecular knowledge for the clinical application of ONFH.


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