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The Retina01:32

The Retina

The retina is a layer of nervous tissue at the back of the eye that transduces light into neural signals. This process, called phototransduction, is carried out by rod and cone photoreceptor cells in the back of the retina.
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Updated: Jun 26, 2026

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REDOX Balance in Oligodendrocytes Is Important for Zebrafish Visual System Regeneration.

Cristina Pérez-Montes1,2,3, Jhoana Paola Jiménez-Cubides1, Almudena Velasco1,3,4

  • 1Instituto de Neurociencias de Castilla y León (INCyL), 37007 Salamanca, Spain.

Antioxidants (Basel, Switzerland)
|December 23, 2023
PubMed
Summary

Reactive oxygen species (ROS) are crucial for zebrafish optic nerve regeneration. Melatonin, an antioxidant, disrupts this process, leading to detrimental effects on oligodendrocyte recovery and neuronal differentiation.

Keywords:
ROSmelatoninregenerationvisual systemzebrafish

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Area of Science:

  • Neuroscience
  • Regenerative Medicine
  • Zebrafish Models

Background:

  • Zebrafish exhibit remarkable regenerative capabilities, particularly in the central nervous system.
  • Oligodendrocytes, microglia, and astrocytes are key glial cells supporting central nervous system regeneration.
  • Understanding oligodendrocyte function and signaling is vital for effective neural repair.

Purpose of the Study:

  • To investigate the role of oligodendrocytes in optic nerve regeneration in zebrafish.
  • To elucidate the signaling pathways, including reactive oxygen species (ROS), involved in this regenerative process.
  • To assess the impact of melatonin, an antioxidant, on oligodendrocyte response and optic tectum regeneration.

Main Methods:

  • Utilized a zebrafish optic nerve crush model.
  • Employed sox10 fluorescent transgenic lines to track differentiated oligodendrocytes.
  • Measured ROS production via flow cytometry.
  • Analyzed optic tectum regeneration, oligodendrocyte, and mitochondrial responses using confocal microscopy and Western blot.
  • Administered melatonin to evaluate its antioxidant effects.

Main Results:

  • Oligodendrocytes produced ROS and activated JNK signaling 3 hours post-injury, correlating with decreased oligodendrocyte and mitochondrial numbers.
  • Melatonin administration prevented these early changes and promoted oligodendrocyte recovery by 24 hours.
  • Melatonin also inhibited JNK upregulation but induced aberrant neuronal differentiation in the optic tectum.
  • A proper balance of ROS is necessary for effective visual system regeneration.

Conclusions:

  • Oligodendrocyte response to injury involves ROS production and JNK activation.
  • Melatonin's antioxidant effect interferes with natural regenerative processes in the zebrafish optic nerve.
  • Disruption of ROS balance by melatonin has a detrimental impact on optic nerve regeneration and neuronal differentiation.