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Aquaporins or AQPs are a family of integral membrane proteins whose primary function is to transport water, while some called aquaglyceroporins also transport glycerol. In addition, aquaporins have also been suspected to be involved in transporting volatile substances, such as carbon dioxide and ammonia, across membranes. Such AQPs that act as gas channels are often highly expressed in cells involved in the gaseous exchange, such as red blood cells, epithelial cells, and pulmonary capillaries.
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Glaucoma is an eye condition characterized by increased intraocular pressure that damages the retina and optic nerve, leading to irreversible blindness if left untreated. The human eye has various components, including the cornea, iris, pupil, lens, and optic nerve. Aqueous humor is secreted by the epithelium of the ciliary body in the posterior chamber and flows through the trabecular meshwork and canal of Schlemm, maintaining normal intraocular pressure. The trabecular meshwork and the canal...
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Altered aquaporin expression in glaucoma eyes.

Thuy Linh Tran1, Toke Bek, Morten la Cour

  • 1Eye Pathology Institute, Department of Neuroscience and Pharmacology, University of Copenhagen, Copenhagen, Denmark.

APMIS : Acta Pathologica, Microbiologica, Et Immunologica Scandinavica
|February 1, 2014
PubMed
Summary

Aquaporin (AQP) water channel expression changes in the eye are linked to glaucoma. This study found reduced AQP7 and AQP9 in the ciliary body and decreased AQP9 in retinal ganglion cells of glaucoma patients.

Keywords:
Aquaporinglaucomahuman eyeimmunohistochemistry

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Area of Science:

  • Ophthalmology
  • Cell Biology
  • Molecular Biology

Background:

  • Aquaporins (AQPs) are water channels crucial for fluid transport.
  • In the eye, AQPs are present in the ciliary body and retina, potentially influencing glaucoma pathogenesis.
  • Understanding AQP expression in glaucoma is vital for disease mechanism research.

Purpose of the Study:

  • To investigate the expression levels of specific aquaporins (AQP1, AQP3, AQP4, AQP5, AQP7, and AQP9) in human glaucoma eyes compared to normal eyes.
  • To determine the role of aquaporins in the pathogenesis of different types of glaucoma.

Main Methods:

  • Human eye tissues from glaucoma patients (n=9) and normal controls (n=6) were analyzed.
  • Immunohistochemistry was employed to detect the expression of AQP1, AQP3, AQP4, AQP5, AQP7, and AQP9.
  • Staining intensities were quantified using optical density measurements.

Main Results:

  • Reduced expression of AQP7 and AQP9 was observed in the nonpigmented ciliary epithelium of glaucoma eyes.
  • Increased AQP7 expression was found in Müller cell endfeet in glaucoma eyes.
  • Decreased AQP9 labeling intensity was noted in retinal ganglion cells (RGCs) of glaucoma eyes.

Conclusions:

  • Aquaporin expression patterns are altered in human glaucoma eyes.
  • Reduced AQP9 in RGCs and altered AQP7 expression in Müller cells suggest a role in glaucoma.
  • Changes in AQP7 and AQP9 in the ciliary body indicate their involvement in the disease process.