Abstract
Angiogenesis plays a pivotal role in the aggressive proliferation of synovial cells in rheumatoid arthritis. We have previously reported the overexpression of inhibitor of DNA binding/differentiation (Id) in the endothelial cells within the synovial tissues of rheumatoid arthritis. In this study, we investigated the role of Id in inflammation and angiogenesis in an in vitro model using HUVECs. Vascular endothelial growth factor (VEGF) and TGFbeta induced the expression of Id1 and Id3 in HUVECs. Forced expression of Id induced proliferative activity in HUVECs accompanied by down-regulation of p16INK4a. Overexpression of Id enhanced expression of ICAM-1 and E-selectin, and induced angiogenic processes such as transmigration, matrix metalloproteinase-2 and -9 expression, and tube formation. In contrast, knockdown of Id1 and Id3 with RNA interference abolished proliferation, activation, and angiogenic processes of HUVECs induced by VEGF. These results indicated that Id plays a crucial role in VEGF-induced signals of endothelial cells by causing activation and potentiation of angiogenic processes. Based on these findings, it was proposed that inhibition of expression and/or function of Id1 and Id3 may potentially be of therapeutic value for conditions associated with pathological angiogenesis.
Publication types
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Research Support, Non-U.S. Gov't
MeSH terms
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Angiogenesis Inhibitors / pharmacology
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Cell Differentiation / genetics
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Cell Differentiation / physiology
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Cell Division / genetics
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Cell Division / physiology
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Cell Movement / physiology
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Cells, Cultured
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DNA-Binding Proteins / antagonists & inhibitors*
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DNA-Binding Proteins / physiology
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E-Selectin / biosynthesis
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Endothelium, Vascular / cytology*
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Endothelium, Vascular / enzymology
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Endothelium, Vascular / metabolism*
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Growth Inhibitors / biosynthesis
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Growth Inhibitors / genetics
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Growth Inhibitors / physiology*
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Humans
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Inhibitor of Differentiation Protein 1
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Inhibitor of Differentiation Proteins
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Intercellular Adhesion Molecule-1 / biosynthesis
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Neoplasm Proteins / antagonists & inhibitors
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Neoplasm Proteins / biosynthesis
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Neoplasm Proteins / genetics
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Neoplasm Proteins / physiology*
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Neovascularization, Physiologic / genetics
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Neovascularization, Physiologic / physiology*
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RNA, Small Interfering / pharmacology
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Repressor Proteins / antagonists & inhibitors
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Repressor Proteins / biosynthesis
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Repressor Proteins / genetics
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Repressor Proteins / physiology*
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Transcription Factors / antagonists & inhibitors
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Transcription Factors / biosynthesis
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Transcription Factors / genetics
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Transcription Factors / physiology*
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Transforming Growth Factor beta / physiology
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Vascular Endothelial Growth Factor A / antagonists & inhibitors
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Vascular Endothelial Growth Factor A / physiology*
Substances
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Angiogenesis Inhibitors
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DNA-Binding Proteins
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E-Selectin
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Growth Inhibitors
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ID1 protein, human
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Inhibitor of Differentiation Protein 1
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Inhibitor of Differentiation Proteins
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Neoplasm Proteins
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RNA, Small Interfering
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Repressor Proteins
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Transcription Factors
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Transforming Growth Factor beta
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Vascular Endothelial Growth Factor A
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Intercellular Adhesion Molecule-1
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ID3 protein, human