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Related Experiment Videos

Decrease of cone opsin mRNA in experimental ocular hypertension.

Heather R Pelzel1, Cassandra L Schlamp, Gretchen L Poulsen

  • 1Department of Ophthalmology and Visual Sciences, University of Wisconsin, Madison, WI 53704, USA.

Molecular Vision
|November 18, 2006
PubMed
Summary

Glaucoma and ocular hypertension damage cone photoreceptors, reducing opsin mRNA in the retina. This effect may be reversible by lowering intraocular pressure (IOP).

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Area of Science:

  • Ophthalmology
  • Neuroscience
  • Genetics

Background:

  • Glaucoma is a leading cause of irreversible blindness worldwide.
  • The disease is characterized by progressive damage to the optic nerve and retina.
  • Photoreceptor dysfunction is increasingly recognized as a component of glaucomatous damage.

Purpose of the Study:

  • To investigate the impact of experimental ocular hypertension and glaucoma on photoreceptor cells.
  • To quantify the expression levels of rod opsin and cone opsin mRNAs in affected eyes.
  • To examine these effects in both animal models and human glaucoma patients.

Main Methods:

  • Induced ocular hypertension in monkeys via laser trabecular meshwork ablation.
  • Measured opsin mRNA levels using RNase Protection Assay and real-time PCR.

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  • Performed in situ hybridization on retinal tissue from monkeys and human glaucoma donors.

    • Main Results:

    • Reduced expression of red/green and blue cone opsin mRNAs observed in monkey eyes with ocular hypertension.
    • No significant change in rod opsin mRNA levels.
    • Decreased cone opsin mRNA in the mid-peripheral retina of human glaucoma eyes, mirroring findings in monkeys.

    Conclusions:

    • Ocular hypertension and glaucoma adversely affect cone photoreceptors in the outer retina.
    • This may involve stress-induced disruption of gene expression, including opsin.
    • Evidence suggests potential reversibility of these photoreceptor changes upon IOP reduction.