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Related Experiment Videos

Endothelin does not affect experimentally induced corneal neovascularization.

R A Eiferman1, J Stagner, M Jumblatt

  • 1Department of Ophthalmology & Visual Sciences, University of Louisville, Kentucky 40292.

Annals of Ophthalmology
|June 1, 1992
PubMed
Summary

Endothelin did not treat corneal neovascularization in rabbits. The blood vessels in the cornea lacked smooth muscle, making them unresponsive to endothelin treatment.

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Area of Science:

  • Ophthalmology
  • Vascular Biology
  • Pharmacology

Background:

  • Corneal neovascularization is an abnormal growth of blood vessels in the cornea.
  • Endothelin is a potent vasoconstrictor with potential therapeutic applications.
  • Understanding the cellular mechanisms of corneal neovascularization is crucial for developing effective treatments.

Purpose of the Study:

  • To investigate the efficacy of endothelin in treating experimentally induced corneal neovascularization.
  • To determine the cellular composition and responsiveness of neovascular corneal vessels to endothelin.

Main Methods:

  • Corneal neovascularization was induced in New Zealand white rabbits.
  • Endothelin was administered via topical, subconjunctival, and intraluminal routes at various concentrations.

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  • Neovascular corneal tissues were examined using electron microscopy.

    • Main Results:

    • Endothelin administration did not affect corneal neovascularization at any tested concentration or route.
    • Electron microscopy revealed that the neovascular vessels were composed solely of endothelial cells and pericytes.
    • Contractile smooth muscle cells, typically responsive to vasoconstrictors, were absent in these vessels.

    Conclusions:

    • Endothelin is ineffective in treating experimental corneal neovascularization.
    • The lack of smooth muscle in neovascular corneal vessels explains their unresponsiveness to endothelin.
    • This finding suggests that therapeutic strategies targeting corneal neovascularization should consider the specific cellular components of the abnormal vessels.