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Enriched environment provides neuroprotection against experimental glaucoma.

María F González Fleitas1, Julián D Devouassoux1, Marcos L Aranda1

  • 1Laboratory of Retinal Neurochemistry and Experimental Ophthalmology, Department of Human Biochemistry, School of Medicine/CEFyBO, University of Buenos Aires/CONICET, Buenos Aires, Argentina.

Journal of Neurochemistry
|October 7, 2019
PubMed
Summary

An enriched environment (EE) housing protected against glaucoma-induced vision loss and optic nerve damage in rats. EE also preserved retinal ganglion cells (RGCs) and improved visual function, even when introduced later.

Keywords:
enriched environmentglaucomamicrogliaoptic nerveretinal ganglion cells

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Area of Science:

  • Neuroscience
  • Ophthalmology
  • Cell Biology

Background:

  • Glaucoma is a leading cause of global vision impairment, characterized by retinal ganglion cell (RGC) and axon damage.
  • Ocular hypertension is a key risk factor for glaucoma, leading to progressive visual field loss.

Purpose of the Study:

  • To investigate the neuroprotective effects of enriched environment (EE) housing on the optic nerve and retina in an experimental model of ocular hypertension.
  • To determine if EE housing can mitigate glaucomatous damage and preserve visual function.

Main Methods:

  • Male Wistar rats were subjected to ocular hypertension via intraocular chondroitin sulfate injections for 10 weeks.
  • Animals were housed in either a standard environment or an enriched environment (EE).
  • Evaluated visual evoked potentials, retinal transport, neurofilament and glial markers, axon counts, and RGC survival.

Main Results:

  • EE housing prevented glaucoma-induced deficits in visual evoked potentials, axonal transport, and neuroinflammation.
  • EE protected against optic nerve demyelination, astrocytosis, and RGC loss.
  • EE increased retinal brain-derived neurotrophic factor (BDNF) levels and preserved RGCs and axons when initiated after 6 weeks of hypertension.

Conclusions:

  • Enriched environment housing demonstrates significant neuroprotective effects against experimental glaucoma.
  • EE preserves visual function, reduces optic nerve damage, and protects RGCs from glaucomatous injury.
  • EE represents a potential therapeutic strategy for mitigating vision loss in glaucoma.