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Normal and glaucomatous outflow regulation.

Ted S Acott1, Janice A Vranka2, Kate E Keller2

  • 1Department of Ophthalmology, Casey Eye Institute, Oregon Health & Science University, Portland, OR, 97239, USA; Department of Chemical Physiology and Biochemistry, Oregon Health & Science University, Portland, OR, 97239, USA.

Progress in Retinal and Eye Research
|August 16, 2020
PubMed
Summary
This summary is machine-generated.

Glaucoma research reveals that trabecular meshwork (TM) cells are crucial for regulating intraocular pressure (IOP). Loss of these cells impairs IOP homeostasis, while restoring them re-establishes this vital function.

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Area of Science:

  • Ophthalmology
  • Cell Biology
  • Biophysics

Background:

  • Intraocular pressure (IOP) regulation is critical for preventing optic nerve damage in glaucoma.
  • The trabecular meshwork (TM) and Schlemm's canal inner wall endothelium (SCE) are key regulators of aqueous humor outflow.
  • The extracellular matrix (ECM) of the TM and SCE plays a significant role in maintaining IOP homeostasis.

Purpose of the Study:

  • To investigate the role of TM cells and ECM in IOP regulation and aqueous humor outflow.
  • To understand the molecular and biomechanical differences in the outflow pathway between normal and glaucomatous eyes.
  • To propose and test a hypothetical model for the primary source of aqueous humor outflow resistance.

Main Methods:

  • Analysis of TM and SCE extracellular matrix (ECM) characteristics and functions.
  • Investigation of TM cell depletion and restoration effects on IOP homeostasis.
  • Examination of segmental differences in aqueous humor outflow, molecular composition, and biomechanical properties.
  • Development and testing of a hypothetical model for outflow resistance involving the SCE basal lamina and JCT cell interactions.

Main Results:

  • Loss of TM cells eliminates IOP homeostatic response; restoration of TM cells restores it.
  • Glaucomatous eyes exhibit more low-flow regions and significantly stiffer juxtacanalicular (JCT) ECM compared to normal eyes.
  • A hypothetical model suggests the SCE basal lamina is the primary resistance source, modulated by JCT cells via versican relocation into basement membrane discontinuities.

Conclusions:

  • TM cell integrity and function are essential for maintaining IOP homeostasis.
  • Alterations in the JCT ECM's biomechanical properties and molecular composition contribute to glaucomatous pathology.
  • The proposed model offers a novel perspective on aqueous humor outflow resistance and its regulation, with implications for glaucoma understanding.