M&#252;ller Glia Cell Activation in a Laser-induced Retinal Degeneration and Regeneration Model in Zebrafish

Federica M. Conedera; Petra Arendt; Carolyn Trepp; Markus Tschopp; Volker Enzmann

doi:10.3791/56249

Müller Glia Cell Activation in a Laser-induced Retinal Degeneration and Regeneration Model i...

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JoVE Journal Neuroscience

Müller Glia Cell Activation in a Laser-induced Retinal Degeneration and Regeneration Model in Zebrafish

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06:27 min

October 27, 2017

DOI: 10.3791/56249-v

Federica M. Conedera^1,2,3, Petra Arendt¹, Carolyn Trepp^1,2,3, Markus Tschopp¹, Volker Enzmann^1,2

¹Department of Ophthalmology, University Hospital of Bern,University of Bern, ²Department of Clinical Research,University of Bern, ³Graduate School for Cellular and Biomedical Sciences,University of Bern

Overview

This study focuses on the use of zebrafish as a model to explore retinal degeneration and regeneration mechanisms. A protocol is described for inducing localized laser injury to the outer retina, monitoring subsequent cellular responses, particularly the involvement of Müller glia, throughout the recovery process.

Key Study Components

Area of Science

Neuroscience
Retinal biology
Regenerative medicine

Background

Zebrafish are recognized for their ability to regenerate retinal tissue.
Studying glial cell responses can provide insights into regenerative processes.
Localized injury models help minimize damage while focusing on specific cellular dynamics.

Purpose of Study

To establish a method for inducing focal retinal damage.
To observe morphological changes and cellular responses during regeneration.
To provide a framework for exploring repair mechanisms in other models.

Methods Used

The study utilized a zebrafish model to induce focal retinal damage using laser treatment.
Anesthetic procedures were detailed for the humane handling of zebrafish during experiments.
The protocol includes imaging techniques like optical coherence tomography (OCT) for monitoring changes.
Critical steps include preparing anesthetic solutions, applying laser treatment, and immediate imaging post-injury.

Main Results

Laser-induced injuries produced distinct hyper-reflective signals in the retina, indicating damage.
Müller glial responses were evident through immunohistochemistry, showing varying GFAP levels post-injury.
Recovery milestones were tracked, revealing a significant decrease in lesion size and restoration of retinal morphology over time.
The findings underline the dynamic cellular responses associated with retinal healing processes.

Conclusions

This study successfully demonstrates a method for inducing and monitoring retinal injury and regeneration in zebrafish.
The insights gained enhance understanding of regenerative mechanisms and their potential therapeutic implications for retinal diseases.

Frequently Asked Questions

What are the advantages of using zebrafish in retinal studies?

Zebrafish are advantageous due to their rapid retinal regeneration capabilities and the transparency of their embryos, allowing for easy in vivo imaging of cellular processes.

How is retinal damage induced in zebrafish?

Retinal damage is induced using a focused laser that targets specific regions of the outer retina, allowing for minimal impact on surrounding structures.

What types of data are obtained from this method?

Data obtained include morphological changes captured through imaging techniques like OCT, as well as immunohistochemical markers indicating cellular responses during regeneration.

How can this method be adapted for other models?

The protocol can be adapted to other vertebrate models by modifying anesthetic procedures and laser settings according to the specific anatomical and physiological needs of the species.

What are the critical considerations for anesthesia in this study?

Appropriate anesthesia is crucial for the welfare of zebrafish and to ensure successful operation; using freshly prepared anesthetic solutions is essential.

The zebrafish is a popular animal model to study mechanisms of retinal degeneration/regeneration in vertebrates. This protocol describes a method to induce localized injury disrupting the outer retina with minimal damage to the inner retina. Subsequently, we monitor in vivo the retinal morphology and the Müller glia response throughout retinal regeneration.

The overall goal of this video is to show how to monitor cellular changes in vivo following a focal, laser-induced retinal damage in Zebrafish. This model can help you answer key questions of retinal regeneration, such as morphological changes, kinetics, as well as cell types involved. The main advantage of this technique is that by inducing a focal injury, biological processes can be investigated directly at the site of injury.

Though this method can provide insight into regeneration of Zebrafish retina, it can also be applied to study the repair mechanism in different animal models. Prepare a stock solution of anesthetic by dissolving 400 milligrams of tricaine powder in 97.9 millimeters of tank water, and 2.1 millimeters of one molar TBS. Adjust to pH 7.0 with one molar tris at pH 9.

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