Endothelial Glycocalyx Morphology in Different Flow Regions of the Aqueous Outflow Pathway of Normal and Laser-Induced Glaucoma Monkey Eyes

Shayna Sosnowik, David L. Swain, Neil Liu, Shan Fan, Carol B. Toris, Haiyan Gong

Research output: Contribution to journalArticlepeer-review

Abstract

Glycocalyx morphology was examined in the trabecular outflow pathway of monkey eyes with and without experimental glaucoma. Laser burns were administered along ~270 degrees of the trabecular meshwork (TM) of one eye (n = 6) or both eyes (n = 2) of each monkey until intraocular pressure remained elevated. Portions of the TM were not laser-treated. Unlasered eyes (n = 6) served as controls. Enucleated eyes were perfused at 15 mmHg to measure the outflow facility, perfused with fluorescein to evaluate the outflow pattern, perfusion-fixed for glycocalyx labeling, and processed for electron microscopy. Coverage and thickness of the glycocalyx were measured in the TM, Schlemm’s canal (SC), collector channels (CCs), intrascleral veins (ISVs), and episcleral veins (ESVs) in non-lasered regions and high- and low-flow regions of controls. Compared to controls, laser-treated eyes had decreased outflow facility (p = 0.02). Glycocalyx thickness increased from the TM to ESVs in non-lasered regions and controls (p < 0.05). Glycocalyx coverage was generally greater distally in non-lasered regions (p < 0.05). In lasered regions, TM, SC, and CCs were partly to completely obliterated, and ISVs and ESVs displayed minimal glycocalyx. Whether the glycocalyx is decreased in the trabecular outflow pathway of human glaucomatous eyes warrants investigation.

Original languageEnglish (US)
Article number2452
JournalCells
Volume11
Issue number15
DOIs
StatePublished - Aug 2022

Keywords

  • Schlemm’s canal
  • collector channel
  • endothelial glycocalyx
  • episcleral vein
  • intraocular pressure
  • intrascleral vein
  • laser-induced ocular hypertension
  • monkey eye
  • segmental outflow
  • trabecular meshwork

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)

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