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Related Concept Videos

Glaucoma: Overview01:25

Glaucoma: Overview

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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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Mitochondrial precursors are translocated to the internal subcompartments via independent mechanisms involving distinct protein machineries called translocases.
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Open Angle Glaucoma: Treatment01:27

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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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Amyloid fibrils are aggregates of misfolded proteins.  Under most circumstances, misfolded proteins are either refolded by chaperone proteins or degraded by the proteasome. However, in the case of a mutation or a disease, these proteins can accumulate to form large clusters and often further assemble to form elongated fibers, called fibrils. 
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At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category,...
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ATP Synthase: Mechanism01:48

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In animals, the mitochondrial F1F0 ATP synthase is the key protein that synthesizes ATP molecules through a complex catalytic mechanism. While the nuclear genome encodes the majority of ATP synthase subunits, the mitochondrial genome encodes some of the enzyme's most critical components. The formation of this multi-subunit enzyme is a complex multi-step process regulated at the level of transcription, translation, and assembly. Defects in one or more of these steps can result in decreased...
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Updated: May 21, 2025

Determination of Mitochondrial Respiration and Glycolysis in Ex Vivo Retinal Tissue Samples
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Protein misfolding and mitochondrial dysfunction in glaucoma.

Arunkumar Venkatesan1, Audrey M Bernstein1,2

  • 1Department of Ophthalmology and Visual Sciences, SUNY Upstate Medical University, Syracuse, NY, United States.

Frontiers in Cell and Developmental Biology
|May 19, 2025
PubMed
Summary
This summary is machine-generated.

Protein misfolding and mitochondrial issues contribute to open-angle glaucoma, causing retinal ganglion cell death. Targeting these cellular defects may offer new therapeutic strategies for glaucoma patients.

Keywords:
NTGPOAGXFGautophagyer stressglaucomamitochondrial dysfunctionupr

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Area of Science:

  • Ophthalmology
  • Cell Biology
  • Genetics

Background:

  • Glaucoma is a primary cause of irreversible blindness globally.
  • Elevated intraocular pressure damages retinal ganglion cells (RGCs).
  • Protein folding and mitochondrial dysfunction are implicated in open-angle glaucoma pathogenesis.

Purpose of the Study:

  • To review the roles of protein folding defects and mitochondrial dysfunction in POAG, NTG, and XFG.
  • To explore the genetic links to these cellular pathologies.
  • To identify potential therapeutic targets for glaucoma.

Main Methods:

  • Review of existing literature on glaucoma pathogenesis.
  • Analysis of genetic mutations associated with open-angle glaucoma.
  • Discussion of cellular mechanisms including ER stress, UPR, autophagy, and mitochondrial dynamics.

Main Results:

  • Genetic mutations (MYOC, OPTN, LOXL1) disrupt protein homeostasis, leading to ER stress and apoptosis.
  • Mitochondrial dysfunction, oxidative stress, and impaired mitophagy contribute to RGC death and optic nerve damage.
  • Interplay between protein folding and mitochondrial defects exacerbates glaucoma progression.

Conclusions:

  • Cellular stress, protein misfolding, and mitochondrial dysfunction are key drivers of glaucoma.
  • Therapeutic strategies targeting protein homeostasis and mitochondrial function show promise for neuroprotection.
  • Understanding these complex pathways is crucial for developing effective glaucoma treatments.