Exosomal HMGB1 derived from hypoxia‐conditioned bone marrow mesenchymal stem cells increases angiogenesis via the JNK/HIF‐1α pathway. Issue 5 (1st April 2021)

• Record Type: Journal Article
• Authors: Gao, Wenling; He, Ronghan; Ren, Jianhua; Zhang, Wenhui; Wang, Kun; Zhu, Lei; Liang, Tangzhao
• Is Part Of: FEBS open bio. Volume 11:Issue 5(2021)
• Page Start: 1364
• Page End: 1373
• Publication Date: 2021-04-01
• Subjects: angiogenesis -- bone marrow mesenchymal stem cells -- exosome -- HMGB1 -- hypoxia; Molecular biology -- Periodicals; Cytology -- Periodicals; Life sciences -- Periodicals; Biological Science Disciplines -- Periodicals; Molecular Biology -- Periodicals; Cell Biology -- Periodicals; Cytology; Life sciences; Molecular biology; Periodicals; 572.805
• DOI: 10.1002/2211-5463.13142
• Languages: English
• ISSNs: 2211-5463

Abstract

Abstract : Mesenchymal stem cells (MSCs) have been described to induce angiogenesis in various tissues and have been used for the development of novel cell‐based therapies. Increasing evidence suggests that MSCs execute their paracrine function via the secretion of exosomes, especially under hypoxic conditions. However, the mechanisms by which MSC‐derived exosomes secreted under hypoxia enhance angiogenesis still remain unclear. To study exosome physiology under hypoxic or normoxic conditions, we isolated exosomes from bone marrow mesenchymal stem cells (BMSCs). Furthermore, we detected the uptake of exosomes by human umbilical vein endothelial cells (HUVECs) by immunofluorescence staining. In addition, we determined the effects of exosomes on cell viability, migration and tube formation in HUVECs by Cell Counting Kit‐8, migration and tube formation assays, respectively. We examined the expression of key proteins related to exosome‐induced angiogenesis by BMSCs cultured under hypoxic conditions by western blot. Exosomes released by BMSCs cultured under hypoxic conditions enhanced cell proliferation, migration and angiogenesis of HUVECs. Hy poxia induced the expression of high mobility group box 1 protein (HMGB1) in BMSC‐derived exosomes, and silencing of HMGB1 abolished the angiogenic effect in HUVECs. Furthermore, exosomal HMGB1 activated the JNK signaling pathway and induced hypoxia‐inducible factor‐1α/vascular endothelial growth factor expression, consequently enhancing angiogenesis in HUVECs. Our data reveal that exosomal HMGB1 promotes angiogenesis via JNK/hypoxia‐inducible factor‐1α signaling. Therefore, BMSC exosomes derived under hypoxia may have potential for development of novel treatment strategies for angiogenesis‐related diseases. Abstract : To study exosome physiology under hypoxic or normoxic conditions from bone marrow mesenchymal stem cells, we determined the effects of exosomes on cell viability, migration and tube formation in human umbilical vein endothelial cells. Our data reveal that exosomal high mobility group box 1 protein promotes angiogenesis under hypoxic conditions. Bone marrow mesenchymal stem cell exosomes obtained under hypoxic conditions may have potential for development of novel treatment strategies for angiogenesis‐related diseases.