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Eosinophil cationic protein in tears in allergic conjunctivitis
P G Montan1, M van Hage-Hamsten
1Department of Ophthalmology, St Eriks Hospital, Stockholm, Sweden.
The British Journal of Ophthalmology
|June 1, 1996
Summary
Eosinophil cationic protein (ECP) levels in tears indicate eosinophil activity in allergic conjunctivitis. Higher ECP levels correlate with disease severity, particularly in atopic and vernal forms.
Area of Science:
- Ophthalmology
- Allergy Research
- Immunology
Background:
- Eosinophil cationic protein (ECP) is a marker of eosinophil activation.
- Allergic conjunctivitis encompasses various forms with differing pathomechanisms.
- Understanding eosinophil involvement is crucial for managing allergic eye diseases.
Purpose of the Study:
- To quantify tear ECP levels in different types of allergic conjunctivitis.
- To assess the correlation between ECP levels and clinical disease severity.
- To elucidate the role of eosinophils in the pathogenesis of allergic conjunctivitis.
Main Methods:
- Tear samples collected from patients with seasonal allergic conjunctivitis (SAC), vernal keratoconjunctivitis (VKC), atopic keratoconjunctivitis (AKC), giant papillary conjunctivitis (GPC), and healthy controls.
- Radioimmunoassay (RIA) used for precise ECP quantification in tear samples.
- Statistical analysis to compare ECP levels across different groups and correlate with disease severity.
Main Results:
- Significantly elevated tear ECP levels were observed in all allergic conjunctivitis groups compared to healthy controls (p < 0.001).
- Higher ECP concentrations were found in patients with atopic keratoconjunctivitis (AKC) and vernal keratoconjunctivitis (VKC) compared to seasonal allergic conjunctivitis (SAC) and giant papillary conjunctivitis (GPC).
- A significant positive correlation was established between tear ECP levels and the severity of allergic conjunctivitis across all studied forms.
Conclusions:
- Eosinophil cationic protein (ECP) plays a significant pathogenic role in atopic keratoconjunctivitis (AKC) and vernal keratoconjunctivitis (VKC).
- Eosinophil involvement is also important, though less pronounced, in giant papillary conjunctivitis (GPC) and seasonal allergic conjunctivitis (SAC).
- Tear ECP measurement serves as a valuable biomarker for assessing eosinophil activity and disease severity in allergic conjunctivitis.