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Mammalian kidney lectin.

I Matsumoto, H Kitagaki, N Iida

    Carbohydrate Research
    |August 15, 1986
    PubMed
    Summary
    This summary is machine-generated.

    Kidney extracts contain lectins that bind to red blood cells and are inhibited by specific glycoproteins. Bovine kidney lectin specifically binds sialylglycoproteins, revealing insights into renal lectin interactions.

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    Area of Science:

    • Biochemistry
    • Immunology
    • Nephrology

    Background:

    • Lectins are proteins known for their ability to bind carbohydrates.
    • Kidney tissues contain endogenous lectins and inhibitors that play roles in biological processes.
    • Understanding these interactions is crucial for comprehending kidney function and disease.

    Purpose of the Study:

    • To identify and characterize lectins and their endogenous inhibitors in mammalian kidney extracts.
    • To investigate the binding specificity of bovine kidney lectin.
    • To analyze the inhibitory properties of various glycoproteins on renal lectins.

    Main Methods:

    • Extraction of lectins and inhibitors from cow, pig, rat, and human kidneys.
    • Gel chromatography (Toyopearl HW-75) for lectin-inhibitor separation.

    Related Experiment Videos

  • Adsorption tests with immobilized glycoconjugates and ion-exchange gels.
  • Hemagglutination inhibition assays.
  • Purification of bovine kidney lectin via ion-exchange chromatography (DEAE-Sephadex A-50).
  • SDS-polyacrylamide gel electrophoresis for subunit analysis.

    • Main Results:

    • Lectins and inhibitors were detected in extracts from multiple mammalian kidneys.
    • Bovine kidney lectin demonstrated sugar-specific binding to sialylglycoproteins, not electrostatic interactions.
    • Endogenous inhibitor fractions inhibited all tested renal lectins.
    • Glycoproteins with sialyl residues and heparin showed significant inhibitory activity.
    • Human urinary Tamm-Horsfall glycoproteins exhibited variable inhibitory activity, not always correlating with sialic acid content.
    • Purified bovine kidney lectin comprised a subunit of approximately 63,000 daltons.

    Conclusions:

    • Mammalian kidneys contain specific lectins and inhibitors involved in carbohydrate recognition.
    • Bovine kidney lectin exhibits specific binding to sialylglycoproteins.
    • Sialylated glycoproteins and heparin are key inhibitors of renal lectins.
    • Further research is needed to elucidate the functional significance of these renal lectins and inhibitors in kidney physiology and pathology.