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Related Concept Videos

Electron Transport Chain: Complex I and II01:46

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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.
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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,...
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Quantification of Reactive Oxygen Species Using 2′,7′-Dichlorofluorescein Diacetate Probe and Flow-Cytometry in Müller Glial Cells
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Mitochondrial ROS in Retinal Neurodegeneration: Thresholds, Quality Control Failure, and Precision Therapeutic

Snježana Kaštelan1,2, Antonela Gverović Antunica3, Suzana Konjevoda4,5

  • 1Department of Ophthalmology, Clinical Hospital Dubrava, 10000 Zagreb, Croatia.

Biomolecules
|March 28, 2026
PubMed
Summary

Mitochondrial reactive oxygen species (mtROS) are vital for retinal health but can cause neurodegeneration when dysregulated. Targeting mtROS recalibration, not suppression, offers new therapeutic avenues for retinal diseases.

Keywords:
mitochondria-targeted interventionmitochondrial quality controlmitochondrial reactive oxygen species (mtROS)mitophagyprecision medicineredox signallingretinal ganglion cellsretinal neurodegenerationreverse electron transport

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Area of Science:

  • Redox biology
  • Mitochondrial function
  • Neuroscience

Background:

  • Mitochondrial reactive oxygen species (mtROS) are crucial for retinal signaling but can cause oxidative damage.
  • Retinal neurons' high energy needs make them vulnerable to mitochondrial redox imbalance.
  • Retinal neurodegenerative diseases exhibit specific mtROS signatures linked to mitochondrial quality control.

Purpose of the Study:

  • To review mtROS sources, regulation, and signaling in the retina.
  • To examine the role of mitochondrial quality control in retinal neurodegeneration.
  • To discuss novel therapeutic strategies for retinal diseases.

Main Methods:

  • Literature review synthesizing current research on mtROS in retinal physiology and disease.
  • Analysis of mitochondrial quality control mechanisms (mitophagy, dynamics, transcriptional networks).
  • Critical examination of antioxidant strategies and emerging therapeutic approaches.

Main Results:

  • mtROS play a dual role, essential for homeostasis but damaging when thresholds are exceeded.
  • Disease-specific mtROS signatures are influenced by mitochondrial quality control capacity.
  • Non-selective antioxidant therapies have limited clinical benefits.

Conclusions:

  • Retinal neurodegeneration is driven by regulated mtROS signaling and failing mitochondrial resilience.
  • Therapeutic strategies should focus on recalibrating mitochondrial redox homeostasis, not abolishing ROS.
  • A unifying framework integrating redox biology, quality control, and precision medicine can guide interventions.