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Updated: Apr 23, 2026
Primary Cell Cultures to Study the Regeneration Potential of Murine Müller Glia after MicroRNA Treatment
Published on: March 28, 2022
Müller glia-microglia cross talk reprograms the Müller glia transcriptome for cell division-related processes during
Soumitra Mitra1, Sulochana Devi1, Mi-Sun Lee1
1Department of Biological Chemistry, Michigan Neuroscience Institute, University of Michigan, Ann Arbor, MI 48109.
Abstract:
In the zebrafish retina, Müller glia (MG) respond to retinal injury by dividing and producing a multipotent progenitor for retinal repair. This cell division is regulated by microglia; however, the underlying mechanism remains unknown. Here, we report that MG-derived Il34 attracts microglia to sites of retinal injury where they stimulate MG proliferation via the release of cytokines, like M17, Spp1, Tnfa, and Tnfb. Remarkably, RNA sequencing analysis of MG's regeneration-associated transcriptome with and without microglia depletion suggests microglia stimulate MG proliferation by preferentially enhancing the expression of regeneration-associated genes involved in cell division-related processes. In contrast, genetic ablation of essentially all microglia from early development appears to reprogram MG, so they exhibit enhanced injury-dependent proliferation, but their survival is compromised. Our studies illustrate the profound effects MG-microglia cross talk can have on MG transcriptional programs related to cell division processes.
Insights
Müller glia (MG) in zebrafish repair retinal injuries by dividing. Microglia attract to injury sites, stimulating MG proliferation and enhancing cell division genes. This MG-microglia crosstalk is crucial for retinal regeneration.
Area of Science:
- Neuroscience
- Developmental Biology
- Regenerative Medicine
Background:
- Müller glia (MG) in zebrafish are crucial for retinal repair following injury.
- MG respond to injury by dividing and generating progenitor cells.
- The role of microglia in regulating MG proliferation during retinal repair is not well understood.
Purpose of the Study:
- To elucidate the mechanism by which microglia regulate Müller glia proliferation after retinal injury in zebrafish.
- To investigate the molecular signaling pathways involved in MG-microglia communication during retinal regeneration.
Main Methods:
- Zebrafish models of retinal injury.
- Microglia depletion experiments.
- RNA sequencing to analyze MG transcriptomes.
- Cytokine analysis.
Main Results:
- MG-derived Il34 attracts microglia to injury sites.
- Microglia stimulate MG proliferation through cytokine release (e.g., M17, Spp1, Tnfa, Tnfb).
- Microglia enhance the expression of regeneration-associated genes in MG, particularly those involved in cell division.
- Early and complete microglia ablation leads to altered MG proliferation and compromised survival.
Conclusions:
- MG-microglia crosstalk is a key regulator of MG proliferation and transcriptional programs during retinal repair.
- Microglia play a critical role in promoting MG-driven retinal regeneration.
- Targeting MG-microglia interactions may offer therapeutic strategies for retinal diseases.
