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The complement abnormalities of lipodystrophy.

J G Sissons, R J West, J Fallows

    The New England Journal of Medicine
    |February 26, 1976
    PubMed
    Summary
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    Patients with partial lipodystrophy often exhibit low serum C3 levels and alternative pathway complement activation. This may predispose them to developing mesangiocapillary nephritis, a form of glomerular disease.

    Area of Science:

    • Immunology
    • Nephrology
    • Genetics

    Background:

    • Lipodystrophy encompasses a group of rare genetic and acquired disorders characterized by loss of adipose tissue.
    • The serum complement system plays a crucial role in innate and adaptive immunity.
    • Alterations in the complement system have been implicated in various autoimmune and inflammatory conditions.

    Purpose of the Study:

    • To investigate the role of the serum complement system in patients with different forms of lipodystrophy.
    • To determine the prevalence of complement abnormalities in partial lipodystrophy.
    • To explore the association between complement activation and renal disease in lipodystrophy patients.

    Main Methods:

    • Serum samples from 25 lipodystrophy patients were analyzed for complement component levels (C3, C4, C2).

    Related Experiment Videos

  • Detection of C3 splitting factor (nephritic factor) to identify alternative pathway activation.
  • Renal biopsies were performed on patients with overt nephritis for histological examination.

    • Main Results:

    • No complement abnormalities were found in total lipodystrophy patients.
    • One patient with limb lipodystrophy showed classical pathway activation.
    • 17 of 21 partial lipodystrophy patients had low serum C3, with 14 positive for C3 splitting factor, indicating alternative pathway activation.
    • 10 patients without overt renal disease showed these complement abnormalities.
    • Six of seven patients with overt nephritis were diagnosed with mesangiocapillary (membranoproliferative) nephritis.

    Conclusions:

    • The majority of partial lipodystrophy patients exhibit hypocomplementemia, primarily due to alternative pathway activation.
    • Complement activation via the alternative pathway is a potential predisposing factor for mesangiocapillary nephritis in lipodystrophy.
    • Further research is warranted to elucidate the precise mechanisms linking complement dysregulation and kidney disease in lipodystrophy.