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Direct antigen binding to glomerular immune complex deposits.

D M Ward, S Lee, C B Wilson

    Kidney International
    |November 1, 1986
    PubMed
    Summary
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    Intrarenal factors significantly increase bovine serum albumin (BSA) accumulation in kidneys affected by chronic serum sickness (CSS). Transplant studies confirm that CSS kidneys exhibit higher BSA uptake than normal kidneys, regardless of immune exposure.

    Area of Science:

    • Nephrology
    • Immunology
    • Renal Physiology

    Background:

    • Chronic serum sickness (CSS) is associated with increased renal accumulation of bovine serum albumin (BSA).
    • The specific contribution of intrarenal factors to this phenomenon remains unclear.

    Purpose of the Study:

    • To evaluate the role of intrarenal factors in the heightened renal uptake of BSA in CSS.
    • To differentiate between systemic and local kidney contributions to BSA accumulation.

    Main Methods:

    • Utilized renal transplantation techniques in rabbits with CSS.
    • Employed single and paired label techniques with radiolabeled BSA (125I BSA) to quantify uptake.
    • Compared BSA uptake in native CSS kidneys versus transplanted normal kidneys, and vice versa, under identical immunologic conditions.

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    Main Results:

    • Transplanted normal kidneys exposed to the CSS milieu showed significantly lower BSA uptake compared to the recipient's native CSS kidney (CSS/normal uptake ratios ranging from 2.1 to 17.5).
    • Transplantation of CSS kidneys into normal hosts demonstrated markedly higher BSA uptake in the CSS kidney (ratios from 18 to 289) compared to the host's normal kidney.
    • Uptake in transplanted CSS kidneys mirrored levels seen in intact CSS kidneys, reinforcing the influence of intrinsic renal factors.

    Conclusions:

    • Intrarenal factors play a critical role in the increased renal accumulation of BSA during chronic serum sickness.
    • The intrinsic properties of the CSS kidney, rather than solely circulating immune complexes, drive enhanced BSA uptake.