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Cell-Type-Specific Complement Expression in the Healthy and Diseased Retina.

Diana Pauly1, Divyansh Agarwal2, Nicholas Dana3

  • 1Experimental Ophthalmology, University Hospital Regensburg, Regensburg 93053, Germany.

Cell Reports
|November 28, 2019
PubMed
Summary

This study maps complement gene expression in mouse retinal cells. Müller cells and RPE are key sources, with expression changing with age and ischemia.

Keywords:
Müller cellage-dependentalternativeclassicalcomplement expressioneyeischemialectinneuronretina

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Area of Science:

  • Ophthalmology
  • Immunology
  • Genomics

Background:

  • Complement dysregulation is implicated in retinal diseases, but cellular expression patterns remain unclear.
  • Understanding cell-specific complement activity is crucial for deciphering retinal disease mechanisms.

Purpose of the Study:

  • To comprehensively map complement gene expression across diverse retinal cell types in mice.
  • To investigate how aging and ischemia impact complement expression in the retina.

Main Methods:

  • Single-cell RNA sequencing of approximately 92,000 mouse retinal cells.
  • Validation of transcriptomic data in five purified retinal cell types.

Main Results:

  • Identified cell-type-specific complement expression patterns across 11 retinal cell types.
  • Müller cells are major sources of complement activators (c1s, c3, c4, cfb).
  • Retinal pigment epithelium (RPE) expresses terminal components and cfh; neurons express cfi and cfp.
  • Aging alters complement expression (increased c1s, cfb, cfp, cfi; decreased cfh).
  • Transient retinal ischemia upregulates complement in microglia, Müller cells, and RPE.

Conclusions:

  • Revealed a distinct complement expression signature in murine retinal cells.
  • Suggests localized, orchestrated regulation of complement within the retinal microenvironment.
  • Provides a foundational dataset for understanding complement's role in retinal health and disease.