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Muller glia in retinal innate immunity: a perspective on their roles in endophthalmitis
Ashok Kumar1, Rajeev K Pandey, Lindsay J Miller
1Department of Ophthalmology, Kresge Eye Institute, Department of Anatomy & Cell Biology, Wayne State University, Detroit, MI 48201, USA. akuma@med.wayne.edu
Abstract:
Muller cells are the predominant glial cell type in the retina and have a unique anatomy, with processes that span the entire retinal thickness. Although extensive morphological and physiological studies of Muller glia have been performed, much less is known about their role in retinal innate immunity, specifically in infectious endophthalmitis. They were found to express toll-like receptors (TLRs), a major family of pattern recognition receptors that mediate innate responses and provide an important mechanism by which Muller glia are able to sense both pathogen- and host-derived ligands in the vitreous and the retina. An increasing body of evidence suggests that TLR-signaling mediates beneficial effects in the retina via production of proinflammatory cytokines/chemokines, antimicrobial peptides, and neuroprotective growth factors to restore tissue homeostasis. In this review, we discussed retinal innate immunity in general with emphasis on the role of Muller glia in initiating retinal innate defense.
Insights
Muller glial cells in the retina express toll-like receptors (TLRs) to detect pathogens and initiate innate immune responses. This signaling promotes beneficial effects, aiding in tissue repair and defense against infection.
Area of Science:
- Ophthalmology
- Immunology
- Neuroscience
Background:
- Muller glia are the primary glial cells in the retina, spanning its full thickness.
- Their role in retinal innate immunity, particularly during infectious endophthalmitis, is not well understood.
- Muller glia express toll-like receptors (TLRs), crucial for innate immune responses.
Purpose of the Study:
- To review the role of Muller glia in retinal innate immunity.
- To emphasize Muller glia's function in initiating defense against pathogens.
Main Methods:
- Literature review focusing on Muller glia and retinal innate immunity.
- Analysis of studies on toll-like receptor expression and signaling in Muller cells.
Main Results:
- Muller glia express TLRs, enabling them to sense pathogen- and host-derived ligands.
- TLR signaling in the retina promotes beneficial outcomes, including inflammation, antimicrobial peptide production, and neuroprotection.
- These responses contribute to restoring tissue homeostasis.
Conclusions:
- Muller glia play a significant role in the retina's innate immune defense.
- TLR-mediated signaling by Muller glia is critical for managing retinal infections and maintaining tissue health.
