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Related Experiment Videos

Tissue C3b receptors.

L Schrieber, R Penny

    Clinical and Experimental Immunology
    |November 1, 1979
    PubMed
    Summary
    This summary is machine-generated.

    Researchers confirmed a C3b receptor in human glomeruli using fluorescein-labelled bacteria (FBC). This receptor was not found in other tissues, suggesting alternative mechanisms for immune complex localization in systemic diseases.

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    Area of Science:

    • Immunology
    • Nephrology
    • Pathology

    Background:

    • Immune complex deposition is implicated in various systemic diseases.
    • The glomerulus is a key site for immune complex filtration and deposition.
    • The presence and function of complement receptors in different human tissues are not fully understood.

    Purpose of the Study:

    • To confirm the presence of a C3b receptor in normal human glomeruli.
    • To develop a quantitative method for assessing C3b receptor binding.
    • To investigate the presence of this receptor in other tissues affected by immune complex diseases.

    Main Methods:

    • Utilized fluorescein-labelled Salmonella typhi coated with C3b (FBC) for detection.
    • Developed a quantitative assay measuring FBC bound per unit area of glomerulus.

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  • Optimized experimental conditions including FBC concentration, temperature, and incubation time.
  • Examined target tissues: synovium, skin, lung, choroid plexus, and uveal tract.

    • Main Results:

    • Confirmed the presence of a C3b receptor in normal human glomeruli.
    • Established a standardized, quantitative method for FBC binding.
    • Demonstrated glomerular FBC binding is dependent on FBC concentration, temperature, and incubation time.
    • Found no evidence of the C3b receptor in the examined non-renal tissues.

    Conclusions:

    • A specific C3b receptor exists in human glomeruli.
    • This glomerular C3b receptor plays a role in immune complex localization within the kidney.
    • Alternative mechanisms, not involving this C3b receptor, likely mediate immune complex deposition in other affected tissues.