September 2016
Volume 57, Issue 12
Open Access
ARVO Annual Meeting Abstract  |   September 2016
Quantification and Distribution of Choroidal Macrophages in Human Eyes with Age-Related Macular Degeneration
Author Affiliations & Notes
  • Gerard A Lutty
    Ophthalmology, Johns Hopkins Univ Sch of Med, Baltimore, Maryland, United States
  • Imran Ahmed Bhutto
    Ophthalmology, Johns Hopkins Univ Sch of Med, Baltimore, Maryland, United States
  • Malia Michelle Edwards
    Ophthalmology, Johns Hopkins Univ Sch of Med, Baltimore, Maryland, United States
  • Rachel E Silver
    Ophthalmology, Tufts University School of Medicine, Boston, Massachusetts, United States
  • Johanna M Seddon
    Ophthalmology, Tufts University School of Medicine, Boston, Massachusetts, United States
  • D. Scott McLeod
    Ophthalmology, Johns Hopkins Univ Sch of Med, Baltimore, Maryland, United States
  • Footnotes
    Commercial Relationships   Gerard Lutty, None; Imran Bhutto, None; Malia Edwards, None; Rachel Silver, None; Johanna Seddon, None; D. Scott McLeod, None
  • Footnotes
    Support  NIH grants EY016151 (GL), EY01765 (Wilmer); the Arnold and Mabel Beckman Foundation, the Altsheler-Durell Foundation, Foundation Fighting Blindness, an RPB Unrestricted Grant (Wilmer and Tufts Medical Center) and the Macular Degeneration Research Fund, Tufts Medical Center, Boston, MA (JMS). Gerard Lutty received an RPB Senior Scientific Investigator Award in 2008.
Investigative Ophthalmology & Visual Science September 2016, Vol.57, 5012. doi:
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    • Get Citation

      Gerard A Lutty, Imran Ahmed Bhutto, Malia Michelle Edwards, Rachel E Silver, Johanna M Seddon, D. Scott McLeod; Quantification and Distribution of Choroidal Macrophages in Human Eyes with Age-Related Macular Degeneration. Invest. Ophthalmol. Vis. Sci. 2016;57(12):5012.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

Purpose : Increasing evidence suggests a role for macrophages in the pathogenesis of age-related macular degeneration (AMD). It is unclear whether they participate in early AMD, geographic atrophy (GA), and/or exudative AMD. In this study, we examined choroidal macrophages in postmortem eyes from aged control subjects and in eyes with early and late stage AMD and evaluated the characteristics of activation: HLA-DR expression and shape change.

Methods : Choroids from postmortem human eyes with clinically documented AMD were incubated with a cocktail of antibodies against IBA-1 to label macrophages and HLA-DR as a macrophage activation marker as well as with UEA lectin to label blood vessels. Whole mounts were imaged using confocal microscopy. IBA-1 and HLA-DR positive cells were counted in three areas (submacula, paramacula, and nonmacula) using computer-assisted image analysis and cell volume and sphericity were determined with Imaris software.

Results : In aged control eyes, the mean number of submacular IBA-1+ and HLA-DR+ choroidal macrophages was 444/mm2 and 153/mm2 respectively. The number was not statistically significantly different in paramacular and nonmacular regions. In early AMD, there was a significant increase in IBA-1+ (p=0.03) in submacula; however, the increase in HLA-DR+ macrophages was not significant compared to controls. In eyes with GA, the number of IBA-1+ and HLA-DR+ cells was not significantly different than controls in most regions; however, HLA-DR+ cells were slightly increased in areas of RPE atrophy. In eyes with exudative AMD, there was a significant increase in HLA-DR+ cells associated with choroidal neovascularization (CNV)(p=0.004). Also, cell volume decreased significantly (p≤0.02) and sphericity increased significantly (p≤0.005) in all AMD groups compared to controls.

Conclusions : Our results demonstrate that the number of macrophages in AMD choroid is not significantly different compared to aged controls but increased activated (HLA-DR+) macrophages were associated with CNV. Macrophage shape became significantly more round and their size decreased significantly in the submacular choroid of all AMD groups.

This is an abstract that was submitted for the 2016 ARVO Annual Meeting, held in Seattle, Wash., May 1-5, 2016.

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