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Experimental nephropathy induced by human polyclonal light chains.

J C Voltarelli, I F Carvalho

    Brazilian Journal of Medical and Biological Research = Revista Brasileira De Pesquisas Medicas E Biologicas
    |January 1, 1985
    PubMed
    Summary
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    Human immunoglobulin light chains (LC) cause acute kidney injury in rats, mimicking human myeloma kidney. The route of administration influences the specific renal damage observed, highlighting LC

    Area of Science:

    • Nephrology
    • Immunology
    • Toxicology

    Background:

    • Human immunoglobulin G (IgG) contains light chains (LC) implicated in kidney damage.
    • The precise mechanisms of LC-induced nephrotoxicity require further elucidation.
    • Myeloma kidney and certain autoimmune diseases involve renal pathology potentially linked to LC.

    Purpose of the Study:

    • To investigate the nephrotoxic effects of isolated human IgG light chains (LC) in a rat model.
    • To determine the influence of dose and route of administration on LC-induced renal lesions.
    • To compare LC nephrotoxicity with that of human albumin and IgG F(ab )2 fragments.

    Main Methods:

    • Preparation of human IgG light chains (LC) via reduction and alkylation.
    • Administration of LC to hydropenic rats via intravenous bolus injection or slow infusion.

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  • Assessment of kidney alterations using classical histology, immunofluorescence, and toluidine blue staining.
  • Measurement of urinary and kidney N-acetyl-beta-D-glucosaminidase levels.

    • Main Results:

    • Intravenous bolus injection of LC induced cast formation in distal and collecting tubules, resembling human myeloma kidney.
    • Slow infusion of LC resulted in proximal tubular cell degeneration without significant cast formation.
    • No kidney alterations were observed with comparable doses of human albumin or IgG F(ab )2 fragments.
    • Increased urinary and kidney N-acetyl-beta-D-glucosaminidase was observed in the infused LC group.

    Conclusions:

    • Human IgG light chains possess inherent nephrotoxic potential, with effects dependent on administration route.
    • LC-induced renal damage in rats shares similarities with human myeloma kidney.
    • These findings contribute to understanding the pathogenesis of nephropathy in multiple myeloma and autoimmune diseases.