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Related Experiment Videos

Complement levels in human tears

J Imanishi, F Takahashi, A Inatomi

    Japanese Journal of Ophthalmology
    |January 1, 1982
    PubMed
    Summary

    Tear complement component C3 (C3) levels can now be measured with small tear samples. Higher C3 concentrations indicate more severe anterior ocular segment inflammation in eye diseases.

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    Area of Science:

    • Ophthalmology
    • Immunology
    • Biochemistry

    Background:

    • The complement system, particularly complement component C3 (C3), plays a role in ocular inflammation.
    • Measuring tear C3 levels can provide insights into ocular disease activity.

    Purpose of the Study:

    • To modify the single radial immunodiffusion technique for accurate tear C3 quantification using minimal sample volumes.
    • To establish reference tear C3 levels in normal subjects and correlate tear C3 concentrations with various ocular diseases.

    Main Methods:

    • Modified single radial immunodiffusion assay.
    • Tear samples collected from 18 healthy individuals and 42 patients with ocular conditions.
    • Quantification of C3 protein concentration in tear fluid.

    Main Results:

    • Mean tear C3 level in normal subjects was 5.12 mg/100 ml.
    • Physiological tear C3 levels were estimated below 10 mg/100 ml.
    • Elevated tear C3 levels were observed in severe inflammatory conditions (e.g., herpetic keratitis, conjunctivitis), while mild inflammation (e.g., allergic conjunctivitis) showed lower levels.

    Conclusions:

    • The modified assay allows for sensitive tear C3 measurement.
    • Tear C3 protein concentration is a potential biomarker for the severity of anterior ocular inflammation.
    • This method can aid in diagnosing and monitoring inflammatory eye diseases.

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