Abstract:
:The nucleoside adenosine is a potent regulator of vascular homeostasis, but it remains unclear how expression or function of the adenosine-metabolizing enzyme adenosine kinase (ADK) and the intracellular adenosine levels influence angiogenesis. We show here that hypoxia lowered the expression of ADK and increased the levels of intracellular adenosine in human endothelial cells. Knockdown (KD) of ADK elevated intracellular adenosine, promoted proliferation, migration, and angiogenic sprouting in human endothelial cells. Additionally, mice deficient in endothelial ADK displayed increased angiogenesis as evidenced by the rapid development of the retinal and hindbrain vasculature, increased healing of skin wounds, and prompt recovery of arterial blood flow in the ischemic hindlimb. Mechanistically, hypomethylation of the promoters of a series of pro-angiogenic genes, especially for VEGFR2 in ADK KD cells, was demonstrated by the Infinium methylation assay. Methylation-specific PCR, bisulfite sequencing, and methylated DNA immunoprecipitation further confirmed hypomethylation in the promoter region of VEGFR2 in ADK-deficient endothelial cells. Accordingly, loss or inactivation of ADK increased VEGFR2 expression and signaling in endothelial cells. Based on these findings, we propose that ADK downregulation-induced elevation of intracellular adenosine levels in endothelial cells in the setting of hypoxia is one of the crucial intrinsic mechanisms that promote angiogenesis.
journal_name
EMBO Mol Medjournal_title
EMBO molecular medicineauthors
Xu Y,Wang Y,Yan S,Zhou Y,Yang Q,Pan Y,Zeng X,An X,Liu Z,Wang L,Xu J,Cao Y,Fulton DJ,Weintraub NL,Bagi Z,Hoda MN,Wang X,Li Q,Hong M,Jiang X,Boison D,Weber C,Wu C,Huo Ydoi
10.15252/emmm.201607066subject
Has Abstractpub_date
2017-09-01 00:00:00pages
1263-1278issue
9eissn
1757-4676issn
1757-4684pii
emmm.201607066journal_volume
9pub_type
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