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Related Experiment Videos

Reduction of phagocyte adherence by nephritic sera: relation to complement activation.

C F Strife, E J Ruley

    Pediatric Research
    |July 1, 1984
    PubMed
    Summary

    Phagocyte adherence to glass (PAg) was reduced in patient sera from various glomerulonephritis conditions. This reduction correlated with low complement C3 levels and improved with clinical recovery, suggesting a role for complement in PAg.

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    Area of Science:

    • Immunology
    • Nephrology
    • Complement System

    Background:

    • Phagocyte adherence to glass (PAg) is a measure of immune cell function.
    • Glomerulonephritis encompasses several kidney diseases, including poststreptococcal glomerulonephritis (P-SGN), lupus erythematosus glomerulonephritis (SLE-GN), and membranoproliferative glomerulonephritis (MPGN).
    • The complement system plays a crucial role in innate immunity and inflammatory responses.

    Purpose of the Study:

    • To investigate the effect of patient sera from various glomerulonephritis conditions on phagocyte adherence.
    • To explore the relationship between phagocyte adherence and complement levels (specifically C3) in these patients.
    • To understand the in vitro mechanisms affecting phagocyte adherence in the context of complement activation.

    Main Methods:

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    • Phagocytes were isolated from healthy donors and patients with P-SGN, SLE-GN, and MPGN.
    • Phagocyte adherence to glass (PAg) was measured after incubation in normal human serum (NHS) and patient sera.
    • Serum C3 levels were quantified, and regression analysis was used to correlate C3 levels with PAg.
    • In vitro experiments involved treating NHS with zymosan or bovine serum albumin (BSA)-anti-BSA complexes to assess their impact on PAg.

    Main Results:

    • Phagocytes showed normal PAg in NHS but reduced PAg after incubation in sera from patients with P-SGN, SLE-GN, and MPGN.
    • Low PAg was observed across a significant proportion of patients with P-SGN, SLE-GN, MPGN types I-III, and nephritis associated with chronic bacteremia.
    • A strong correlation was found between low C3 levels and decreased PAg in sera from patients with P-SGN, SLE-GN, and MPGN type I.
    • In patients with P-SGN and nephritis associated with chronic bacteremia, PAg and complement levels normalized with clinical improvement.
    • In vitro, PAg was reduced by NHS treated with zymosan or BSA-anti-BSA complexes, indicating complement activation's role.

    Conclusions:

    • Reduced phagocyte adherence is a feature associated with sera from patients with various glomerulonephritis conditions.
    • Complement component C3 levels are significantly correlated with impaired phagocyte adherence in these kidney diseases.
    • The findings suggest that complement system dysregulation contributes to altered phagocyte function in glomerulonephritis.
    • Restoration of complement levels and PAg paralleled clinical improvement, highlighting the potential therapeutic relevance of targeting the complement system.