TWEAK/Fn14 pathway is a novel mediator of retinal neovascularization

Hossein Ameri, Hua Liu, Rong Liu, Yonju Ha, Adriana A. Paulucci-Holthauzen, Shuqun Hu, Massoud Motamedi, Bernard F. Godley, Ronald Tilton, Wenbo Zhang

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Purpose. Retinal neovascularization (NV) is a major cause of vision loss in ischemia-induced retinopathy. Tumor necrosis factor (TNF)-like weak inducer of apoptosis (TWEAK) and its receptor, fibroblast growth factor inducible-14 (Fn14), have been implicated in angiogenesis, but their role in retinal diseases is unknown. The goal of this study was to investigate the role of TWEAK/Fn14 pathway in retinal NV. Methods. Studies were performed in a mouse model of oxygen-induced retinopathy (OIR) and in primary human retinal microvascular endothelial cells (HRMECs). Hyperoxia treatment was initiated on postnatal day (P)14. Immunohistochemistry and quantitative PCR (qPCR) were used to assess retinal vascular changes in relation to expression of Fn14 and TWEAK. Results. Fibroblast growth factor-inducible 14 mRNA was prominently increased from P13 to P17 in OIR retinas, whereas TWEAK level was slightly decreased. These alterations were normalized by hyperoxia treatment and were more striking in isolated retinal vessels. There was a discernible shift in the immunoreactivity of Fn14 and TWEAK from the neuronal layers in the healthy retina to the neovascular tufts in that of OIR. Blockade of TWEAK/Fn14 significantly prevented retinal NV while slightly accelerated revascularization. In contrast, activation of Fn14 positively regulated survival pathways in the B-cell lymphoma-2 (Bcl2) family and robustly enhanced HRMEC survival. Furthermore, gene analysis revealed the regulatory region of Fn14 gene contains several conserved hypoxia inducible factor (HIF)-1α binding sites. Overexpression of HIF-1α prominently induced Fn14 expression in HRMECs. Conclusions. We found that the TNF-like weak inducer of apoptosis (TWEAK)/fibroblast growth factor inducible-14 (Fn14) pathway is involved in the development of pathologic retinal neovascularization. Hypoxia inducible factor-1α is likely implicated in the upregulation of Fn14.

Original languageEnglish (US)
Pages (from-to)801-813
Number of pages13
JournalInvestigative Ophthalmology and Visual Science
Volume55
Issue number2
DOIs
StatePublished - Jan 9 2014

Fingerprint

Retinal Neovascularization
Hypoxia-Inducible Factor 1
Retinal Vessels
Hyperoxia
Endothelial Cells
Oxygen
Retina
Tumor Necrosis Factor-alpha
Pathologic Neovascularization
Apoptosis
Retinal Diseases
Nucleic Acid Regulatory Sequences
B-Cell Lymphoma
Genes
Cell Survival
Up-Regulation
Ischemia
Immunohistochemistry
Binding Sites
Polymerase Chain Reaction

Keywords

  • Fn14
  • Ischemia-induced retinopathy
  • Neovascularization
  • Retina
  • TWEAK

ASJC Scopus subject areas

  • Ophthalmology
  • Sensory Systems
  • Cellular and Molecular Neuroscience

Cite this

TWEAK/Fn14 pathway is a novel mediator of retinal neovascularization. / Ameri, Hossein; Liu, Hua; Liu, Rong; Ha, Yonju; Paulucci-Holthauzen, Adriana A.; Hu, Shuqun; Motamedi, Massoud; Godley, Bernard F.; Tilton, Ronald; Zhang, Wenbo.

In: Investigative Ophthalmology and Visual Science, Vol. 55, No. 2, 09.01.2014, p. 801-813.

Research output: Contribution to journalArticle

Ameri, Hossein ; Liu, Hua ; Liu, Rong ; Ha, Yonju ; Paulucci-Holthauzen, Adriana A. ; Hu, Shuqun ; Motamedi, Massoud ; Godley, Bernard F. ; Tilton, Ronald ; Zhang, Wenbo. / TWEAK/Fn14 pathway is a novel mediator of retinal neovascularization. In: Investigative Ophthalmology and Visual Science. 2014 ; Vol. 55, No. 2. pp. 801-813.
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abstract = "Purpose. Retinal neovascularization (NV) is a major cause of vision loss in ischemia-induced retinopathy. Tumor necrosis factor (TNF)-like weak inducer of apoptosis (TWEAK) and its receptor, fibroblast growth factor inducible-14 (Fn14), have been implicated in angiogenesis, but their role in retinal diseases is unknown. The goal of this study was to investigate the role of TWEAK/Fn14 pathway in retinal NV. Methods. Studies were performed in a mouse model of oxygen-induced retinopathy (OIR) and in primary human retinal microvascular endothelial cells (HRMECs). Hyperoxia treatment was initiated on postnatal day (P)14. Immunohistochemistry and quantitative PCR (qPCR) were used to assess retinal vascular changes in relation to expression of Fn14 and TWEAK. Results. Fibroblast growth factor-inducible 14 mRNA was prominently increased from P13 to P17 in OIR retinas, whereas TWEAK level was slightly decreased. These alterations were normalized by hyperoxia treatment and were more striking in isolated retinal vessels. There was a discernible shift in the immunoreactivity of Fn14 and TWEAK from the neuronal layers in the healthy retina to the neovascular tufts in that of OIR. Blockade of TWEAK/Fn14 significantly prevented retinal NV while slightly accelerated revascularization. In contrast, activation of Fn14 positively regulated survival pathways in the B-cell lymphoma-2 (Bcl2) family and robustly enhanced HRMEC survival. Furthermore, gene analysis revealed the regulatory region of Fn14 gene contains several conserved hypoxia inducible factor (HIF)-1α binding sites. Overexpression of HIF-1α prominently induced Fn14 expression in HRMECs. Conclusions. We found that the TNF-like weak inducer of apoptosis (TWEAK)/fibroblast growth factor inducible-14 (Fn14) pathway is involved in the development of pathologic retinal neovascularization. Hypoxia inducible factor-1α is likely implicated in the upregulation of Fn14.",
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AU - Liu, Hua

AU - Liu, Rong

AU - Ha, Yonju

AU - Paulucci-Holthauzen, Adriana A.

AU - Hu, Shuqun

AU - Motamedi, Massoud

AU - Godley, Bernard F.

AU - Tilton, Ronald

AU - Zhang, Wenbo

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