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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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In open-angle glaucoma, the iridocorneal angle remains open, but the trabecular meshwork becomes stiff, slowing down the outflow of aqueous humor. This causes a buildup of aqueous humor in the anterior chamber, leading to a sudden increase in intraocular pressure. The treatment for open-angle glaucoma focuses on reducing the elevated intraocular pressure by either decreasing the secretion of aqueous humor or increasing its outflow.
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Ophthalmic drug delivery faces major limitations due to poor absorption across the corneal membrane. This process is primarily driven by diffusion and is influenced by two main factors: the physicochemical properties of the drug and tear drainage. Most ophthalmic drugs, such as pilocarpine, epinephrine, atropine, and local anesthetics, are weak bases. They are typically formulated at an acidic pH to enhance chemical stability. However, this leads to high ionization, reducing their ability to...
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Tracking Single Proteins in Lipid Bilayers Using Fluorescence Microscopy
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A decrease in the permeability of aquaporin zero as a possible cause for presbyopia.

R Gerometta1, O A Candia1

  • 1Departamento de Oftalmologia, Facultad de Medicina, UNNE, Corrientes, Argentina; Department of Ophthalmology, Icahn School of Medicine at Mount Sinai, United States.

Medical Hypotheses
|December 1, 2015
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Summary

Presbyopia, or age-related farsightedness, may be caused by decreased permeability of aquaporin zero (AQP-0), a protein crucial for fluid flow within the eye lens during accommodation.

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Area of Science:

  • Ophthalmology
  • Cell Biology
  • Biophysics

Background:

  • The crystalline lens focuses light but has complex physiological processes.
  • Aging leads to presbyopia and cataracts, with incomplete explanations for presbyopia.
  • Current theories for presbyopia include lens enlargement, ciliary muscle weakening, and fiber hardening.

Purpose of the Study:

  • To analyze potential causes of presbyopia.
  • To propose a novel hypothesis for presbyopia involving aquaporin zero (AQP-0) permeability.
  • To investigate the role of fluid flow and AQP-0 in lens accommodation.

Main Methods:

  • Analysis of existing research on lens physiology and aging.
  • Proposal of a new hypothesis based on laboratory findings.
  • Conceptualization of methods to visualize and measure fluid volume changes in the lens.

Main Results:

  • A fluid flow mechanism within the avascular lens during accommodation is proposed.
  • Aquaporin zero (AQP-0), abundant in lens fiber cells, is hypothesized to facilitate this fluid transport.
  • Decreased AQP-0 permeability is suggested as a potential cause of presbyopia.

Conclusions:

  • Defects in AQP-0 permeability may contribute to presbyopia.
  • Age-related decline in lens water permeability could impair accommodation.
  • Further research is needed to visualize and quantify age-related fluid loss in the lens.