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Related Experiment Videos

Hemolytic complement in tears.

B J Mondino, G W Zaidman

    Ophthalmic Research
    |January 1, 1983
    PubMed
    Summary

    Tear complement levels, including C5, are elevated in corneal ulcers, suggesting a role in host defense against microbial infections. These findings highlight the importance of complement in ocular immunity.

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    Area of Science:

    • Immunology
    • Ophthalmology
    • Biochemistry

    Background:

    • The ocular surface is protected by innate and adaptive immune mechanisms.
    • Tears contain various immune components, including complement proteins, crucial for host defense.
    • Corneal ulcers, particularly microbial keratitis, can compromise ocular integrity and lead to vision loss.

    Purpose of the Study:

    • To investigate the hemolytic activities of complement components C1, C4, C3, and C5 in tear samples.
    • To compare complement levels in normal subjects versus patients with corneal ulcers.
    • To explore the potential role of tear complement in the host defense against microbial corneal ulcers.

    Main Methods:

    • Hemolytic assays were performed on tear samples from 7 normal subjects and 10 patients with corneal ulcers.
    • Complement component activity was quantified by measuring the 50% hemolysis of sensitized sheep red blood cells.
    • Specific complement components analyzed included C1, C4, C3, and C5.

    Main Results:

    • Normal tears exhibited absent or low hemolytic activities for C1, C4, and C3.
    • Complement component C5 was detected in tears from 4 out of 7 normal subjects.
    • Tears from patients with corneal ulcers showed significantly elevated levels of C1, C4, C3, and C5, with wide value ranges.
    • Complement component C5 demonstrated the highest hemolytic activities in both normal and corneal ulcer tear samples.

    Conclusions:

    • Elevated levels of complement components C1, C4, C3, and C5 are present in tears of patients with corneal ulcers.
    • Complement component C5 appears to be a significant contributor to hemolytic activity in tears.
    • Tear complement, particularly C5, may play a crucial role in the host defense mechanisms against microbial corneal ulcers.

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