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Expression of a p55 interleukin-2 receptor-like molecule on corneal epithelial cells
R L Hendricks1, T R Malek, B Y Yue
1Department of Ophthalmology, Lions of Illinois Eye Research Institute, University of Illinois, College of Medicine, Chicago 60612.
Insights
Mouse corneal epithelial cells express a molecule resembling the p55 subunit of the high-affinity interleukin-2 receptor (IL-2R). This finding suggests constitutive production of this IL-2R-like molecule by corneal cells.
Area of Science:
- Immunology
- Ophthalmology
- Cell Biology
Background:
- The high-affinity interleukin-2 receptor (IL-2R) plays a crucial role in immune responses.
- The presence and function of IL-2R subunits in ocular tissues, particularly the cornea, are not fully understood.
Purpose of the Study:
- To investigate the presence and characteristics of a molecule similar to the p55 subunit of IL-2R on mouse corneal epithelial cells.
Main Methods:
- Immunoperoxidase staining using a monoclonal antibody (mAb 7D4) specific for p55 IL-2R.
- Analysis of corneal epithelial cells in tissue culture.
- Western Blot analysis of corneal epithelial extracts.
Main Results:
- A molecule antigenically similar to p55 IL-2R was detected on the surface of normal mouse corneal epithelial cells.
- Staining was localized to the corneal epithelium, with highest intensity centrally.
- Cultured corneal epithelial cells retained expression of the molecule, and a 55 kD protein reactive with mAb 7D4 was identified in corneal extracts.
Conclusions:
- Mouse corneal epithelial cells constitutively produce a molecule antigenically and molecularly similar to the p55 subunit of the high-affinity IL-2R.
- This suggests a potential role for this molecule in corneal physiology or immune privilege.
Abstract:
We observed a molecule on the surface of mouse corneal epithelial cells that is similar or identical to the p55 subunit of the high affinity interleukin-2 receptor (p55 IL-2R). The presence of this molecule in normal corneas was demonstrated by immunoperoxidase staining with a monoclonal antibody (mAb) specific for p55 IL-2R (7D4). Staining was observed only in the corneal epithelium. The staining intensity was greatest in the central cornea, becoming weaker toward the corneal scleral limbus, and was very weak or absent in the conjunctival epithelium. Other ocular tissues were not stained. Epithelial cells grown in tissue culture from corneal explants retained expression of the molecule recognized by 7D4 as demonstrated by immunoperoxidase staining. Western Blot analysis of an extract of corneal epithelium demonstrated the presence of a 55 kD protein that reacted with 7D4. Our findings suggest that a molecule similar both antigenically and in molecular size to the p55 IL-2R subunit is constitutively produced by corneal epithelial cells.
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