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Exosomes secreted from mutant‐HIF‐1α‐modified bone‐marrow‐derived mesenchymal stem cells attenuate early steroid‐induced avascular necrosis of femoral head in rabbit
Author(s) -
Li Haile,
Liu Danping,
Li Chen,
Zhou Shanjian,
Tian Dachuan,
Xiao Dawei,
Zhang Huan,
Gao Feng,
Huang Jianhua
Publication year - 2017
Publication title -
cell biology international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.932
H-Index - 77
eISSN - 1095-8355
pISSN - 1065-6995
DOI - 10.1002/cbin.10869
Subject(s) - mesenchymal stem cell , angiogenesis , microvesicles , bone marrow , chemistry , avascular necrosis , microbiology and biotechnology , in vivo , cancer research , femoral head , immunology , biology , anatomy , biochemistry , microrna , gene
Mesenchymal stem cells (MSCs)‐derived exosomes exhibit protective effects on damaged or diseased tissues. Hypoxia‐inducible factor 1α (HIF‐1α) plays a critical role in bone development. However, HIF‐1α is easily biodegradable under normoxic conditions. The bone‐marrow‐derived mesenchymal stem cells (BMSCs) were transfected with adenovirus carrying triple point‐mutations (amino acids 402, 564, and 803) in the HIF‐1α coding sequence (CDS). The mutant HIF‐1α can efficiently express functional proteins under normoxic conditions. To date, no study has reported the role of exosomes secreted by mutant HIF‐1α modified BMSCs in the recovery of the early steroid‐induced avascular necrosis of femoral head (SANFH). In this study, we firstly analyzed exosomes derived from BMSCs modified by mutant (BMSC‐Exos MU ) or wild‐type HIF‐1α (BMSC‐Exos WT ). In vitro, we investigated the osteogenic differentiation capacity of BMSCs modified by BMSC‐Exos MU or BMSC‐Exos WT , and the angiogenesis effects of BMSC‐Exos MU and BMSC‐Exos WT on human umbilical vein endothelial cells (HUVECs). Besides, the healing of the femoral head was also assessed in vivo. We found that the potential of osteogenic differentiation of BMSCs treated with BMSC‐Exos MU was higher than the wild‐type group in vitro. In addition, BMSC‐Exos MU stimulated the proliferation, migration, and tube formation of HUVECs in a dose‐dependent manner. Compared with the BMSC‐Exos WT or PBS control group, the injection of BMSC‐Exos MU into the necrosis region markedly accelerated the bone regeneration and angiogenesis, which were indicated by the increased trabecular reconstruction and microvascular density. Taken together, our data suggest that BMSC‐Exos MU facilitates the repair of SANFH by enhancing osteogenesis and angiogenesis.