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VEGF-A-induced changes in distal outflow tract structure and function.

Jannis Oltmann1, Mark Morell1, Mohamad Dakroub1

  • 1Department of Ophthalmology, University Hospital Würzburg, Josef-Schneider-Straße 11, 97080, Würzburg, Germany.

Graefe'S Archive for Clinical and Experimental Ophthalmology = Albrecht Von Graefes Archiv Fur Klinische Und Experimentelle Ophthalmologie
|October 13, 2023
PubMed
Summary
This summary is machine-generated.

Vascular Endothelial Growth Factor-A (VEGF-A) dilates distal outflow tract vessels, enhancing fluid outflow facility. This effect occurs independently of the trabecular meshwork (TM), suggesting a novel glaucoma regulation pathway.

Keywords:
Distal outflow tractOutflow facilityPorcine eyesSD-OCTVEGF-A

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Area of Science:

  • Ophthalmology
  • Vascular Biology
  • Glaucoma Research

Background:

  • The distal outflow tract is crucial for maintaining intraocular pressure (IOP).
  • Vascular Endothelial Growth Factor-A (VEGF-A) plays a role in vascularization and tissue remodeling.
  • Understanding VEGF-A's impact on ocular outflow is vital for glaucoma treatment strategies.

Purpose of the Study:

  • To investigate the effects of VEGF-A on distal outflow tract vessels.
  • To determine how VEGF-A-induced changes impact ocular fluid outflow facility.

Main Methods:

  • Porcine anterior segments perfused with VEGF-A were compared to controls.
  • Spectral-domain optical coherence tomography (SD-OCT) was used for 3D imaging of outflow tract vessel volume changes over 3 hours.
  • Intraocular pressure (IOP) and outflow facility were measured over 48 hours in response to VEGF-A.

Main Results:

  • VEGF-A significantly increased distal outflow tract vessel volume by 16.8% within 100 minutes.
  • VEGF-A enhanced outflow facility by 38.6% at 24 hours in eyes without trabecular meshwork (TM).
  • Control eyes showed no significant changes in vessel volume or outflow facility.

Conclusions:

  • VEGF-A causes vasodilation in the distal outflow tract.
  • VEGF-A increases outflow facility, an effect independent of the trabecular meshwork.
  • These findings suggest a potential therapeutic target for glaucoma related to distal outflow regulation.