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As in Real Estate, Location Matters: Cellular Expression of Complement Varies Between Macular and Peripheral Regions
Randy Zauhar1, Josef Biber2, Yassin Jabri3
1Department of Chemistry and Biochemistry, The University of the Sciences in Philadelphia, Philadelphia, PA, United States.
Insights
Complement pathway activation in age-related macular degeneration (AMD) is complex. This study reveals distinct cellular roles in the retina and choroid during AMD progression, identifying potential therapeutic targets.
Area of Science:
- Ophthalmology
- Immunology
- Cell Biology
Background:
- The initiation of the complement pathway in ocular degeneration, specifically age-related macular degeneration (AMD), is not well understood.
- Understanding cellular contributions to complement homeostasis is crucial for developing effective treatments.
Purpose of the Study:
- To investigate the cellular mechanisms underlying complement pathway activation in the context of age-related macular degeneration (AMD).
- To identify specific retinal and choroidal cell types involved in maintaining complement balance in healthy and diseased eyes.
Main Methods:
- Utilized gene expression analysis, including single-cell (scRNA-seq) and bulk RNA sequencing.
- Employed mass spectrometry and immunohistochemistry to analyze cellular and molecular changes.
- Dissected the roles of various retinal and choroidal cell populations.
Main Results:
- Early AMD shows a stronger cellular response in the choroid, involving fibroblasts, pericytes, and endothelial cells.
- Late AMD exhibits more prominent complement alterations in the retina, particularly with classical pathway initiators.
- Significant spatial heterogeneity was observed in these complement-related cellular responses.
Conclusions:
- The study highlights the diverse cellular responses and intercellular cooperation in complement pathway regulation in healthy and AMD eyes.
- Identified specific cell types and pathways as potential therapeutic targets for AMD treatment.
Abstract:
The cellular events that dictate the initiation of the complement pathway in ocular degeneration, such as age-related macular degeneration (AMD), is poorly understood. Using gene expression analysis (single cell and bulk), mass spectrometry, and immunohistochemistry, we dissected the role of multiple retinal and choroidal cell types in determining the complement homeostasis. Our scRNA-seq data show that the cellular response to early AMD is more robust in the choroid, particularly in fibroblasts, pericytes and endothelial cells. In late AMD, complement changes were more prominent in the retina especially with the expression of the classical pathway initiators. Notably, we found a spatial preference for these differences. Overall, this study provides insights into the heterogeneity of cellular responses for complement expression and the cooperation of neighboring cells to complete the pathway in healthy and AMD eyes. Further, our findings provide new cellular targets for therapies directed at complement.
