Distribution and quantification of choroidal macrophages in human eyes with age-related macular degeneration

D. Scott McLeod, Imran Bhutto, Malia M. Edwards, Rachel E. Silver, Johanna M. Seddon, Gerard A. Lutty

Research output: Contribution to journalArticle

Abstract

PURPOSE. Increasing evidence suggests a role for macrophages in the pathogenesis of agerelated macular degeneration (AMD). This study examined choroidal macrophages and their activation in postmortem eyes from subjects with and without AMD. METHODS. Choroids were incubated with anti-ionized calcium-binding adapter molecule 1 (anti-IBA1) to label macrophages, anti-human leukocyte antigen-antigen D-related (anti-HLADR) as a macrophage activation marker, and Ulex europaeus agglutinin lectin to label blood vessels. Whole mounts were imaged using confocal microscopy. IBA1-and HLA-DR–positive (activated) cells were counted in submacula, paramacula, and nonmacula, and cell volume and sphericity were determined using computer-assisted image analysis. RESULTS. In aged control eyes, the mean number of submacular IBA1+ and HLA-DR+ macrophages was 433/mm2 and 152/mm2, respectively. In early AMD eyes, there was a significant increase in IBA1+ and HLA-DR+ cells in submacula compared to those in controls (P = 0.0015 and P = 0.008, respectively). In eyes with neovascular AMD, there were significantly more HLA-DR+ cells associated with submacular choroidal neovascularization (P = 0.001). Mean cell volume was significantly lower (P ≤ 0.02), and sphericity was significantly higher (P ≤ 0.005) in all AMD groups compared to controls. CONCLUSIONS. The average number of IBA1+ macrophages in submacular and paramacular choroid was significantly higher in early/intermediate AMD compared to that in aged controls. HLA-DR+ submacular macrophages were significantly increased in all stages of AMD, and they were significantly more round and smaller in size in the submacular AMD choroid, suggesting their activation. These findings support the concept that AMD is an inflammatory disease.

Original languageEnglish (US)
Pages (from-to)5843-5855
Number of pages13
JournalInvestigative Ophthalmology and Visual Science
Volume57
Issue number14
DOIs
StatePublished - Nov 2016

Keywords

  • Age-related macular degeneration
  • Choriocapillaris
  • Choroidal neovascularization
  • Choroidal vasculature
  • Macrophages

ASJC Scopus subject areas

  • Ophthalmology
  • Sensory Systems
  • Cellular and Molecular Neuroscience

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