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Area of Science:

  • Ophthalmology
  • Immunology
  • Molecular Biology

Background:

  • Age-related macular degeneration (AMD) involves choroidal inflammation, complement deposition, and C-reactive protein (CRP) accumulation.
  • Pro-inflammatory signals regulating immune cell recruitment in AMD choroids are not fully understood.

Purpose of the Study:

  • To identify inflammatory molecules upregulated in human AMD choroidal tissue.
  • To investigate the role of monomeric C-reactive protein (mCRP) in regulating G-CSF secretion.

Main Methods:

  • Cytokine profiling of human AMD and control donor RPE/choroid tissues using a multiplex inflammation array.
  • Validation of G-CSF protein expression by ELISA in a separate cohort.
  • Assay of G-CSF secretion in RPE/choroid organ cultures treated with mCRP.
  • Single nuclei RNA sequencing to identify G-CSF secreting cell types.

Main Results:

  • Elevated G-CSF protein was identified in the choroids of AMD donors compared to controls.
  • mCRP treatment significantly increased G-CSF protein secretion in RPE/choroid organ cultures.
  • Choroidal endothelial cells and fibroblasts were identified as key G-CSF secreting cells in response to mCRP.
  • G-CSF receptor expression was primarily observed on choroidal macrophages and dendritic cells.

Conclusions:

  • Elevated G-CSF in AMD choroids, potentially induced by mCRP, may contribute to AMD pathogenesis by recruiting immune cells.
  • This finding highlights a potential therapeutic target for modulating inflammatory responses in AMD.