High glucose-induced jagged 1 in endothelial cells disturbs notch signaling for angiogenesis: a novel mechanism of diabetic vasculopathy
Abstract
Angiogenesis is a multistep process which is orchestrated by intercellular signaling. We developed an in vitro model of human angiogenesis to identify a pathologic angiogenesis and intercellular signaling in high glucose condition. We co-cultivated human endothelial cells (ECs) and smooth muscle cells (SMCs) in a spheroid on an SMC monolayer for 7 days either in high glucose or in control condition. We analyzed vascular growth and expression of notch or its ligands with confocal microscopy. Abnormal angiogenesis by high glucose condition was characterized by (1) increased sprouting and branching (high glucose vs. normal: number of sprouts 20.3±1.5 vs. 13.7±2.9, p=0.024; number of branching points 7.6±2.5 vs. 2.3±2.1, p=0.047), (2) decreased vascular diameter (diameter of the tubes 13.4±6. 1μm vs. 19.1±8.8 μm, p=0.012) and (3) destabilization of the tubes. We identified that high glucose induced jagged 1 and suppressed notch1 in ECs whereas it did not affect Dll4. Constitutive jagged 1 overexpression or inhibition of notch1 in ECs induced abnormal angiogenesis as the high glucose condition did. Endothelial-specific shRNA targeting jagged 1 rescued the aberrant angiogenesis in high glucose condition. High glucose condition induce...Continue Reading
References
Fringe glycosyltransferases differentially modulate Notch1 proteolysis induced by Delta1 and Jagged1
Citations
Proangiogenic cells enhanced persistent and physiologic neovascularization compared with macrophages
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