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Oxidative damage induces MCP-1 secretion and macrophage aggregation in age-related macular degeneration (AMD)
Zhaojiang Du1, Xuemei Wu2, Meixia Song3,4
1Department of Ophthalmology, Tangdu Hospital, The Fourth Military Medical University, Xi'an, 710038, China. duzhaojiang@126.com.
Purpose:
Age-related macular degeneration (AMD) is a major cause of progressive and degenerative visual impairment. Although the exact pathogenic mechanism of AMD is still unknown, clinical observations such as the high accumulation of oxidative products and macrophages in retina suggest the importance of oxidative stress and inflammation in AMD.
Methods:
Mouse photoreceptor-derived 661 W cells and human ARPE-19 cells were treated with oxidized phospholipids (Ox-PC) or H2O2 to mimic oxidative damage. The effect of monocyte chemoattractant protein 1 (MCP-1) secreted by retina cells on the migration of monocyte macrophage RAW 264.7 cells was determined using transwell chambers and antibody neutralization assay. MCP-1, tumor necrosis factor-α (TNF-α), interleukin-1β (IL-1β), and vascular endothelial growth factor (VEGF) that secreted into supernatant were measured by ELISA and their intracellular expression was detected by qRT-PCR and western blot. Intracellular Ox-PC level was detected by competitive ELISA. The amount of migrated RAW 264.7 cells was counted by flow cytometry.
Results:
Oxidative damage by both H2O2 and Ox-PC induced the secretion of MCP-1 in human ARPE-19 and mouse 661 W cells. MCP-1 induced by oxidative damage enhanced the migration ability of macrophage RAW 264.7 cells and the secretion of TNF-α, IL-1β and VEGF, which could be reduced by anti-MCP-1 neutralizing antibodies.
Conclusion:
The results indicated that oxidative damage increases intracellular Ox-PC and the secretion of MCP-1 in retina cells. The increased MCP-1 induced by oxidative damage attracts macrophages to retinas, and macrophages release pro-inflammatory factor and promote the process of AMD.
Insights
Oxidative damage in retina cells increases oxidized phospholipids and monocyte chemoattractant protein 1 (MCP-1). This attracts macrophages, promoting inflammation and age-related macular degeneration (AMD) progression.
Area of Science:
- Ophthalmology
- Cell Biology
- Immunology
Background:
- Age-related macular degeneration (AMD) is a leading cause of vision loss.
- Oxidative stress and inflammation are implicated in AMD pathogenesis.
- Accumulation of oxidative products and macrophages in the retina suggests their role.
Purpose of the Study:
- To investigate the role of oxidative damage in retina cells.
- To determine the effect of oxidative damage on monocyte chemoattractant protein 1 (MCP-1) secretion.
- To elucidate the mechanism by which MCP-1 influences macrophage activity and AMD progression.
Main Methods:
- Retina cells (ARPE-19, 661W) were exposed to H2O2 or oxidized phospholipids (Ox-PC) to induce oxidative damage.
- MCP-1 secretion was measured, and its effect on macrophage (RAW 264.7) migration was assessed using transwell assays.
- Pro-inflammatory factors (TNF-α, IL-1β) and VEGF secretion were quantified via ELISA and gene expression analysis.
Main Results:
- Oxidative damage significantly increased MCP-1 secretion in both human and mouse retina cells.
- MCP-1 enhanced macrophage migration and promoted the secretion of pro-inflammatory cytokines (TNF-α, IL-1β) and VEGF.
- Neutralizing antibodies against MCP-1 reduced these effects, confirming MCP-1's central role.
Conclusions:
- Oxidative damage elevates intracellular Ox-PC and MCP-1 secretion in retina cells.
- Increased MCP-1 attracts macrophages to the retina, initiating inflammatory responses.
- This macrophage-mediated inflammation contributes to the pathological process of AMD.
