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Related Experiment Videos

A rapid versatile microassay for cellular retinol-binding protein using Lipidex-1000 microcolumns.

A M Timmers, D A van Groningen-Luyben, F J Daemen

    Journal of Lipid Research
    |September 1, 1986
    PubMed
    Summary
    This summary is machine-generated.

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    A new microassay effectively quantifies cellular retinol-binding protein (cRBP) using Lipidex-1000 for separation. This method overcomes retinol

    Area of Science:

    • Biochemistry
    • Molecular Biology
    • Cell Biology

    Background:

    • Cellular retinol-binding protein (cRBP) plays a crucial role in retinol metabolism and transport.
    • Accurate quantification of cRBP is essential for understanding various physiological and pathological processes.
    • Existing methods for cRBP assay may be time-consuming or lack versatility.

    Purpose of the Study:

    • To develop a novel, rapid, and versatile microassay for quantifying cellular retinol-binding protein (cRBP).
    • To establish a robust method for separating bound and free retinol ligand using Lipidex-1000.
    • To optimize conditions for accurate cRBP measurement in biological samples.

    Main Methods:

    • A microassay was developed utilizing Lipidex-1000, a hydrophobic Sephadex derivative, for separating bound and free retinol.

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  • The detergent Ammonyx LO was employed to overcome retinol's adherence to surfaces and form micellar dispersions.
  • Retinal pigment epithelium (RPE) cells served as the source for cRBP, and binding kinetics were determined.

    • Main Results:

    • The assay demonstrated high binding capacity, with Lipidex-1000 exceeding 400 nmol of retinol per ml of gel.
    • Optimal conditions for cRBP saturation were achieved within 60 minutes at room temperature with free retinol concentrations over 180 nM.
    • The method achieved near 100% total ligand recovery and allowed analysis of approximately 50 samples in 4 hours.

    Conclusions:

    • The developed microassay provides a rapid, versatile, and quantitative method for measuring cellular retinol-binding protein.
    • Lipidex-1000 effectively separates bound and free retinol, enabling accurate cRBP quantification.
    • This assay is suitable for high-throughput analysis and contributes to the study of retinol-related biological processes.