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Electron Transport Chain: Complex I and II01:46

Electron Transport Chain: Complex I and II

The mitochondrial electron transport chain (ETC) is the main energy generation system in the eukaryotic cells. However, mitochondria also produce cytotoxic reactive oxygen species (ROS) due to the large electron flow during oxidative phosphorylation. While Complex I is one of the primary sources of superoxide radicals, ROS production by Complex II is uncommon and may only be observed in cancer cells with mutated complexes.
ROS generation is regulated and maintained at moderate levels necessary...
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Photoreceptors and Visual Pathways

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, whereas...
Diabetic Retinopathy01:27

Diabetic Retinopathy

DefinitionDiabetic retinopathy is a microvascular complication of diabetes affecting the retinal blood vessels.Risk FactorsDiabetic retinopathy is present in almost all individuals with type 1 diabetes and more than 60% of those with type 2 diabetes after two decades of disease.The risk increases with poor glycemic control, hypertension, dyslipidemia, smoking, pregnancy, and puberty.Although cataracts and glaucoma are also more frequent in people with diabetes, retinopathy remains the leading...
Mitochondrial Membranes01:45

Mitochondrial Membranes

A single mitochondrion is a bean-shaped organelle enclosed by a double-membrane system. The outer membrane of mitochondria is smooth and contains many porins - the integral membrane transporters. Porins enable free diffusion of ions and small uncharged molecules through the outer mitochondrial membrane but limit the transport of molecules larger than 5000 Daltons. Further, the outer mitochondrial membrane forms a unique structure called membrane contact sites with other subcellular organelles,...
Mitochondria01:37

Mitochondria

Mitochondria are eukaryotic cellular organelles that are known to produce energy through a process called oxidative phosphorylation. Besides their primary function, mitochondria are involved in various cellular processes, including cell growth, differentiation, signaling, metabolism, and senescence. Age-related changes cause a decline in mitochondrial quality and integrity due to increased mitochondrial mutations and oxidative damage. Thus, aging can severely impact mitochondrial functions,...

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Updated: May 28, 2026

Determination of Mitochondrial Respiration and Glycolysis in Ex Vivo Retinal Tissue Samples
08:45

Determination of Mitochondrial Respiration and Glycolysis in Ex Vivo Retinal Tissue Samples

Published on: August 4, 2021

Mitochondrial dysfunction in retinal diseases.

Megha Barot1, Mitan R Gokulgandhi, Ashim K Mitra

  • 1School of Pharmacy, University of Missouri-Kansas City, Kansas City, MO 64108, USA.

Current Eye Research
|October 8, 2011
PubMed
Summary

Mitochondrial dysfunction and DNA damage contribute to retinal diseases like AMD. Targeting mitochondria may offer new treatments for these conditions.

Area of Science:

  • Ophthalmology
  • Cell Biology
  • Genetics

Background:

  • Mitochondria are crucial for retinal cell function and survival.
  • Mitochondrial dysfunction is increasingly linked to various retinal degenerations.
  • Mitochondrial genomic instability is a factor in age-related retinal pathophysiology.

Purpose of the Study:

  • To review the role of mitochondrial dysfunction in retinal diseases.
  • To highlight mitochondrial DNA damage in age-related macular degeneration (AMD).
  • To explore mitochondria-targeting therapies for retinal diseases.

Main Methods:

  • Literature review focusing on mitochondrial dysfunction and retinal diseases.
  • Analysis of studies on oxidative stress and mitochondrial DNA (mtDNA) damage.

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  • Examination of therapeutic strategies targeting mitochondria.
  • Main Results:

    • Oxidative stress-induced mitochondrial dysfunction is implicated in diabetic retinopathy, glaucoma, and AMD.
    • mtDNA damage and impaired repair pathways contribute to AMD pathogenesis.
    • Aging increases susceptibility of retinal mitochondria to oxidative damage.

    Conclusions:

    • Mitochondria are a vulnerable component of retinal cell antioxidant defenses.
    • Targeting mitochondria to reduce oxidative stress or repair mtDNA damage shows therapeutic promise for retinal diseases.
    • Mitochondria-based therapies offer potential new treatment avenues for retinal degenerative diseases.