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Published on: March 28, 2022
Microglia Suppress Ascl1-Induced Retinal Regeneration in Mice
Levi Todd1, Connor Finkbeiner1, Claire K Wong1
1Department of Biological Structure, University of Washington, Seattle, WA 98195, USA.
Abstract:
The innate immune system plays key roles in tissue regeneration. For example, microglia promote neurogenesis in Müller glia in birds and fish after injury. Although mammalian retina does not normally regenerate, neurogenesis can be induced in mouse Müller glia by Ascl1, a proneural transcription factor. We show that in mice, microglia inhibit the Ascl1-mediated retinal regeneration, suggesting that the innate immune system limits the regenerative response to injury.
Insights
Microglia, immune cells in the brain, normally inhibit retinal regeneration in mice. This innate immune response prevents the regrowth of nerve cells in the mammalian retina, even when regeneration is chemically induced.
Area of Science:
- Neuroscience
- Immunology
- Regenerative Medicine
Background:
- The innate immune system is crucial for tissue repair and regeneration.
- Microglia are known to promote neurogenesis in non-mammalian species after injury.
- Mammalian retinal regeneration is typically absent but can be induced.
Purpose of the Study:
- To investigate the role of microglia in Ascl1-induced retinal regeneration in mice.
- To understand how the innate immune system influences the potential for neural regeneration in the mammalian retina.
Main Methods:
- Utilized a mouse model for induced retinal regeneration.
- Investigated the effect of microglia on Ascl1-mediated neurogenesis in Müller glia.
- Analyzed the innate immune response in the context of retinal injury and regeneration.
Main Results:
- Microglia were found to inhibit Ascl1-mediated retinal regeneration in mice.
- The innate immune system actively limits the regenerative capacity of the mammalian retina.
- This inhibition occurs despite the presence of a pro-regenerative factor (Ascl1).
Conclusions:
- Microglia play an inhibitory role in mammalian retinal regeneration.
- The innate immune system acts as a barrier to retinal repair in mammals.
- Targeting microglia may offer therapeutic strategies for inducing retinal regeneration.
