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Sci Signal. 2015 Sep 22;8(395):ra94. doi: 10.1126/scisignal.aaa8695.

SOCS3 in retinal neurons and glial cells suppresses VEGF signaling to prevent pathological neovascular growth.

Author information

1
Department of Ophthalmology, Harvard Medical School, Boston Children's Hospital, 300 Longwood Avenue, Boston, MA 02115, USA.
2
Department of Cardiology, Harvard Medical School, Boston Children's Hospital, Boston, MA 02115, USA.
3
Department of Cardiology, Harvard Medical School, Boston Children's Hospital, Boston, MA 02115, USA. Harvard Stem Cell Institute, Harvard University, Cambridge, MA 02138, USA.
4
University Eye Hospital Freiburg, Killianstr. 5, Freiburg 79106, Germany.
5
Department of Pediatrics, Centre Hospitalier Universitaire (CHU) Sainte-Justine Research Center, Université de Montréal, Montréal, Québec H3T1C4, Canada.
6
Department of Ophthalmology, Harvard Medical School, Boston Children's Hospital, 300 Longwood Avenue, Boston, MA 02115, USA. lois.smith@childrens.harvard.edu.

Abstract

Neurons and glial cells in the retina contribute to neovascularization, or the formation of abnormal new blood vessels, in proliferative retinopathy, a condition that can lead to vision loss or blindness. We identified a mechanism by which suppressor of cytokine signaling 3 (SOCS3) in neurons and glial cells prevents neovascularization. We found that Socs3 expression was increased in the retinal ganglion cell and inner nuclear layers after oxygen-induced retinopathy. Mice with Socs3 deficiency in neuronal and glial cells had substantially reduced vaso-obliterated retinal areas and increased pathological retinal neovascularization in response to oxygen-induced retinopathy, suggesting that loss of neuronal/glial SOCS3 increased both retinal vascular regrowth and pathological neovascularization. Furthermore, retinal expression of Vegfa (which encodes vascular endothelial growth factor A) was higher in these mice than in Socs3 flox/flox controls, indicating that neuronal and glial SOCS3 suppressed Vegfa expression during pathological conditions. Lack of neuronal and glial SOCS3 resulted in greater phosphorylation and activation of STAT3, which led to increased expression of its gene target Vegfa, and increased endothelial cell proliferation. In summary, SOCS3 in neurons and glial cells inhibited the STAT3-mediated secretion of VEGF from these cells, which suppresses endothelial cell activation, resulting in decreased endothelial cell proliferation and angiogenesis. These results suggest that neuronal and glial cell SOCS3 limits pathological retinal angiogenesis by suppressing VEGF signaling.

PMID:
26396267
PMCID:
PMC4659437
DOI:
10.1126/scisignal.aaa8695
[Indexed for MEDLINE]
Free PMC Article

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