O-GlcNAcylation of FoxO1 mediates nucleoside diphosphate kinase B deficiency induced endothelial damage

Nucleoside diphosphate kinase B (NDPK-B) acts as a protective factor in the retinal vasculature. NDPK-B deficiency leads to retinal vasoregression mimicking diabetic retinopathy (DR). Angiopoetin 2 (Ang-2), an initiator of retinal vasoregression in DR, is upregulated in NDPK-B deficient retinas and...

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Main Authors: Shan, Shenliang (Author) , Chatterjee, Anupriya (Author) , Qiu, Yi (Author) , Hammes, Hans-Peter (Author) , Wieland, Thomas (Author) , Feng, Yuxi (Author)
Format: Article (Journal)
Language:English
Published: 12 July 2018
In: Scientific reports
Year: 2018, Volume: 8
ISSN:2045-2322
DOI:10.1038/s41598-018-28892-y
Online Access:Verlag, kostenfrei, Volltext: http://dx.doi.org/10.1038/s41598-018-28892-y
Verlag, kostenfrei, Volltext: https://www.nature.com/articles/s41598-018-28892-y
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Author Notes:Shenliang Shan, Anupriya Chatterjee, Yi Qiu, Hans-Peter Hammes, Thomas Wieland & Yuxi Feng

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520 |a Nucleoside diphosphate kinase B (NDPK-B) acts as a protective factor in the retinal vasculature. NDPK-B deficiency leads to retinal vasoregression mimicking diabetic retinopathy (DR). Angiopoetin 2 (Ang-2), an initiator of retinal vasoregression in DR, is upregulated in NDPK-B deficient retinas and in NDPK-B depleted endothelial cells (ECs) in vitro. We therefore investigated the importance of Ang-2 in NDPK-B deficient retinas and characterized the mechanisms of Ang-2 upregulation upon NDPK-B depletion in cultured ECs. The crucial role of retinal Ang-2 in the initiation of vasoregression was verified by crossing NDPK-B deficient with Ang-2 haplodeficient mice. On the molecular level, FoxO1, a transcription factor regulating Ang-2, was upregulated in NDPK-B depleted ECs. Knockdown of FoxO1 abolished the elevation of Ang-2 induced by NDPK-B depletion. Furthermore O-GlcNAcylated FoxO1 was found preferentially in the nucleus. An increased O-GlcNAcylation of FoxO1 was revealed upon NDPK-B depletion. In accordance, the inhibition of protein O-GlcNAcylation normalized NDPK-B depletion induced Ang-2 upregulation. In summary, we demonstrated that the upregulation of Ang-2 upon NDPK-B deficiency is driven by O-GlcNAcylation of FoxO1. Our data provide evidence for a central role of protein O-GlcNAcylation in NDPK-B associated vascular damage and point to the hexosamine pathway as an important target in retinal vasoregression. 
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