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Guinea pig complement fixation by tissues from hypocomplementaemic renal diseases.

H Ohi, M Seki, T Sakashita

    Clinical Immunology and Immunopathology
    |April 1, 1986
    PubMed
    Summary
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    See all related articles

    Renal tissues from patients with systemic lupus erythematosus (SLE), mesangiocapillary glomerulonephritis (MCGN), and acute glomerulonephritis (AGN) activate complement pathways. SLE tissues activate both classical and alternate pathways, while MCGN and AGN tissues activate only the alternate pathway.

    Area of Science:

    • Immunology
    • Nephrology
    • Pathology

    Background:

    • Complement pathway activation is implicated in various renal diseases.
    • Identifying specific complement pathways involved can aid in understanding disease mechanisms.

    Purpose of the Study:

    • To investigate complement pathway activation in renal tissues from patients with systemic lupus erythematosus (SLE), mesangiocapillary glomerulonephritis (MCGN), and acute glomerulonephritis (AGN).

    Main Methods:

    • Renal biopsy tissues were tested for guinea pig complement fixation (C3 and C4).
    • Further assays used C4-deficient, EDTA, heated, and EGTA Mg2+ guinea pig sera to differentiate pathway activation.

    Main Results:

    • Guinea pig C3 fixation was observed in 9/15 SLE, 4/7 MCGN, and 2/7 AGN cases.

    Related Experiment Videos

  • Guinea pig C4 fixation occurred in 5/9 C3-positive SLE cases, but not in C3-positive MCGN or AGN cases.
  • SLE tissues showed activation of both classical and alternate complement pathways, while MCGN and AGN tissues showed alternate pathway activation.

    • Conclusions:

    • Renal tissues from SLE patients activate both classical and alternate complement pathways.
    • Renal tissues from MCGN and AGN patients primarily activate the alternate complement pathway.
    • These findings highlight distinct complement activation patterns in different renal diseases.