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Morphological and morphometric changes in rat optic nerve microvessels in a glaucoma experimental model.

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  • 1Área de Oftalmología, Facultad de Medicina, Universidad de Málaga, Málaga, España.

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|August 4, 2014
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Summary

Elevated intraocular pressure (IOP) caused significant changes in optic nerve (ON) head capillaries. While changes were less severe in the ON

Keywords:
Barrera hematoencefálicaCapilaresCapillariesGLUT-1Hematoencephalic barrierIntraocular pressureNervio ópticoOptic nervePresión intraocular

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Area of Science:

  • Ophthalmology
  • Neuroscience
  • Vascular Biology

Background:

  • Intraocular pressure (IOP) elevation is a key risk factor for optic neuropathies.
  • Optic nerve (ON) head vasculature is crucial for retinal ganglion cell survival.
  • Understanding microvascular changes in the ON head under elevated IOP is vital.

Purpose of the Study:

  • To investigate morphological and morphometric alterations in optic nerve (ON) head capillaries.
  • To assess changes in response to experimentally induced and sustained intraocular pressure (IOP) increase.
  • To evaluate the role of GLUT-1 in capillary changes within the ON head.

Main Methods:

  • Wistar rats experienced episcleral vein cauterization to induce sustained IOP increase for 3 months.
  • Immunohistochemical analysis using GLUT-1 antibody was performed on optic nerve (ON) head sections.
  • Capillary density, area, perimeter, and mean diameter were quantified.

Main Results:

  • Control ON heads showed lower capillary density and larger caliber in the prelaminar region.
  • Experimental group exhibited reduced capillary density (except prelaminar region) and smaller caliber in ON head.
  • These vascular changes were less pronounced in the initial portion of the optic nerve.

Conclusions:

  • Sustained IOP increase induced significant qualitative and quantitative capillary changes in the ON head.
  • The initial portion of the ON showed less severe vascular compromise, suggesting some resilience.
  • Findings may elucidate reduced ocular blood flow observed in primary open-angle glaucoma.