ABSTRACT
BACKGROUND: Pathological neovascularization in neovascular age-related macular degeneration (nAMD) is the leading cause of vision loss in the elderly. Increasing evidence shows that cells of myeloid lineage play important roles in controlling pathological endothelium formation. Suppressor of cytokine signaling 3 (SOCS3) pathway has been linked to neovascularization. METHODS: We utilised a laser-induced choroidal neovascularization (CNV) mouse model to investigate the neovascular aspect of human AMD. In several cell lineage reporter mice, bone marrow chimeric mice and Socs3 loss-of-function (knockout) and gain-of-function (overexpression) mice, immunohistochemistry, confocal, and choroidal explant co-culture with bone marrow-derived macrophage medium were used to study the mechanisms underlying pathological CNV formation via myeloid SOCS3. FINDINGS: SOCS3 was significantly induced in myeloid lineage cells, which were recruited into the CNV lesion area. Myeloid Socs3 overexpression inhibited laser-induced CNV, reduced myeloid lineage-derived macrophage/microglia recruitment onsite, and attenuated pro-inflammatory factor expression. Moreover, SOCS3 in myeloid regulated vascular sprouting ex vivo in choroid explants and SOCS3 agonist reduced in vivo CNV. INTERPRETATION: These findings suggest that myeloid lineage cells contributed to pathological CNV formation regulated by SOCS3. FUNDING: This project was funded by NIH/NEI (R01EY030140, R01EY029238), BrightFocus Foundation, American Health Assistance Foundation (AHAF), and Boston Children's Hospital Ophthalmology Foundation for YS and the National Institutes of Health/National Heart, Lung and Blood Institute (U01HL098166) for PZ.
Subject(s)
Choroidal Neovascularization/etiology , Choroidal Neovascularization/metabolism , Disease Susceptibility , Myeloid Cells/metabolism , Suppressor of Cytokine Signaling 3 Protein/genetics , Animals , Biomarkers , Choroid/blood supply , Choroid/metabolism , Choroid/pathology , Choroidal Neovascularization/drug therapy , Choroidal Neovascularization/pathology , Disease Models, Animal , Flavanones/pharmacology , Fluorescent Antibody Technique , Immunohistochemistry , Macrophages/immunology , Macrophages/metabolism , Mice , Mice, Knockout , Models, Biological , Suppressor of Cytokine Signaling 3 Protein/agonists , Suppressor of Cytokine Signaling 3 Protein/metabolism , Tocopherols/adverse effectsABSTRACT
Wound healing and the management of chronic wounds represent a significant burden on the NHS. Members of the suppressor of cytokine signalling (SOCS) family have been implicated in the regulation of a range of cellular processes. The current study aims to explore the importance of SOCS-3 and SOCS-4 in regulating cellular traits associated with wound healing. SOCS-3 over-expression and SOCS-4 knockdown mutant lines were generated and verified using q-PCR and western blotting in human keratinocytes (HaCaT) and endothelial cells (HECV). Over-expression of SOCS-3 resulted in a significantly reduced proliferative rate in HaCaT keratinocytes and also enhanced the tubule formation capacity of HECV cells. SOCS-4 knockdown significantly reduced HaCaT migration and HECV cell tubule formation. Suppression of SOCS-4 influenced the responsiveness of HaCaT and HECV cells to EGF and TGFß and resulted in a dysregulation of phospho-protein expression in HaCaT cells. SOCS-3 and SOCS-4 appear to play regulatory roles in a number of keratinocyte and endothelial cellular traits associated with the wound healing process and may also be able to regulate the responsiveness of these cells to EGF and TGFß. This implies a potential regulatory role in the wound healing process and, thus highlights their potential as novel therapies.