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[Incidence and function of Langerhans cells in various corneal diseases]
1Universitäts-Klinik für Augenheilkunde, Innsbruck.
Insights
Langerhans cells, a type of dendritic cell, are present in diseased corneas, potentially contributing to immune privilege breakdown and corneal transplant rejection. Their presence may also drive inflammatory corneal disease progression.
Area of Science:
- Ophthalmology
- Immunology
- Cell Biology
Context:
- Corneal transplantation is a common procedure for various corneal diseases.
- The role of immune cells, specifically Langerhans cells, in corneal pathology is not fully understood.
- Langerhans cells are antigen-presenting cells crucial for immune responses.
Purpose:
- To investigate the distribution and frequency of Langerhans cells in diseased corneas.
- To explore the potential role of Langerhans cells in corneal immune privilege breakdown and inflammatory diseases.
- To correlate Langerhans cell presence with specific corneal conditions and transplant outcomes.
Summary:
- Immunohistochemical techniques revealed Langerhans cells in corneal buttons from patients with diverse corneal diseases, including alkali burns, viral keratitis (herpes simplex, herpes zoster), bacterial ulcers, corneal scars, rheumatoid arthritis-associated ulcers, and chronic allograft reactions.
- The frequency of Langerhans cells in corneas with epidermalization post-burns was comparable to normal epidermis.
- Numerous Langerhans cells were observed in the central corneal epithelium of patients with various inflammatory and infectious corneal conditions.
Impact:
- The presence and persistence of Langerhans cells in diseased corneas may contribute to the breakdown of corneal immune privilege, leading to increased corneal transplant rejection rates.
- Langerhans cells, as potent antigen-presenting cells, likely play a significant role in initiating and advancing immune responses in inflammatory corneal diseases.
- Understanding Langerhans cell involvement could lead to novel therapeutic strategies for managing corneal diseases and improving transplant success.
Abstract:
Using immunohistochemical techniques, we investigated the distribution and frequency of Langerhans cells in corneal buttons obtained from patients who underwent corneal transplantation because of various corneal diseases. The frequency of these dendritic cells was similar to that in the normal epidermis in corneas with epidermalization after severe alkali burns. Numerous Langerhans cells, albeit in smaller numbers, were also present in the central corneal epithelium of patients with keratitis due to infection with herpes simplex virus, keratitis due to herpes zoster virus, bacterial corneal ulcers, corneal scars, corneal ulcers associated with rheumatoid arthritis, and patients with chronic corneal allograft reactions. The presence and persistence of Langerhans cells in diseased corneas may account for, at least in part, a breakdown of corneal immune privilege with a higher rate of rejection episodes after corneal transplantation. Furthermore, it is probable that Langerhans cells as potent antigen-presenting cells may also play an important role in the initiation and the progression of immune responses in various inflammatory corneal diseases.
