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Related Experiment Videos

Albumin-binding surfaces for implantable devices.

J R Keogh1, F F Velander, J W Eaton

  • 1Department of Laboratory Medicine and Pathology, University of Minnesota, Minneapolis 55455.

Journal of Biomedical Materials Research
|April 1, 1992
PubMed
Summary
This summary is machine-generated.

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Researchers developed a new polymer modification technique to improve the biocompatibility of implantable devices. This method enhances selective and reversible albumin adsorption, potentially reducing adverse biological reactions like inflammation and coagulation.

Area of Science:

  • Biomaterials Science
  • Polymer Chemistry
  • Surface Science

Background:

  • Implantable devices and blood-contacting materials accumulate denatured proteins, potentially triggering adverse biological responses like coagulation and inflammation.
  • Surface passivation with albumin is a known strategy to improve material biocompatibility.

Purpose of the Study:

  • To develop polymers that can spontaneously, selectively, and reversibly adsorb host albumin when exposed to biological fluids.
  • To create implantable materials with enhanced biocompatibility through surface modification.

Main Methods:

  • A novel derivatization technique was employed to increase the albumin affinity of polyetherurethane (PU).
  • High-molecular-weight dextran, covalently attached to the albumin-binding dye Cibacron Blue, was incorporated into the PU.

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  • Adsorption of human albumin onto modified and unmodified PU was quantified and characterized.

    • Main Results:

    • Derivatized PU showed specific albumin binding, not easily blocked by other serum proteins.
    • The majority of albumin adsorbed onto the modified PU was reversibly bound.
    • Albumin binding to derivatized PU was primarily mediated by ligand-specific interactions with the albumin-binding dextran-dye conjugate.

    Conclusions:

    • Implantable polymers can be engineered to display albumin-binding dyes that selectively and reversibly bind albumin.
    • This surface modification strategy may lead to an infinitely renewable albumin coating from physiological fluids.
    • The developed materials hold promise for a new generation of implantable devices with improved biological compatibility.