Related Experiment Videos
Nonspecific immunoglobulin E in aqueous humor: evaluation in uveitis
C P Hamel1, H De Luca, C Billotte
1Laboratory of Immunology, National Eye Institute, Bethesda, MD 20892.
Summary
Elevated immunoglobulin E (IgE) in aqueous humor (AH) suggests intraocular synthesis in uveitis patients. High IgE levels were particularly noted in those with toxocaral retinitis, indicating a localized immune response.
Area of Science:
- Ophthalmology
- Immunology
- Clinical Chemistry
Background:
- Uveitis is an inflammatory eye condition with diverse causes.
- Immunoglobulin E (IgE) plays a role in allergic reactions and parasitic infections.
- Intraocular IgE levels have not been extensively studied in uveitis.
Purpose of the Study:
- To measure and compare immunoglobulin E (IgE) levels in aqueous humor (AH) and serum of uveitis patients and controls.
- To investigate the correlation between high intraocular IgE and specific conditions like toxocaral retinitis.
- To assess the potential for intraocular IgE synthesis in uveitis.
Main Methods:
- Quantitative analysis of IgE levels in AH and serum using the paper radioimmunosorbent test (PRIST).
- Inclusion of 74 uveitis patients and 13 control patients with senile cataract.
- Calculation of the AH/serum IgE ratio, normalized to albumin concentration, in a subset of patients.
Main Results:
- Significantly higher IgE levels were found in the AH of uveitis patients compared to controls.
- Four out of five patients with the highest AH IgE levels were diagnosed with toxocaral retinitis.
- A normalized AH/serum IgE ratio greater than 0.60 was observed in 13 out of 25 uveitis patients, suggesting intraocular production.
Conclusions:
- Elevated intraocular IgE is a characteristic finding in a significant proportion of uveitis patients.
- Toxocaral retinitis is strongly associated with high levels of intraocular IgE.
- The findings support the hypothesis of intraocular IgE synthesis contributing to ocular inflammation in uveitis.