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Related Experiment Videos

Complexation of basic fibroblast growth factor with gelatin

Muniruzzaman1, Y Tabata, Y Ikada

  • 1Research Center for Biomedical Engineering, Kyoto University, Japan.

Journal of Biomaterials Science. Polymer Edition
|July 2, 1998
PubMed
Summary

Basic fibroblast growth factor (bFGF) forms complexes with acidic gelatin through electrostatic interactions, evidenced by increased solution turbidity and altered heparin affinity. This complexation is pH-dependent and influenced by ionic strength.

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Area of Science:

  • Biochemistry
  • Materials Science

Background:

  • Basic fibroblast growth factor (bFGF) is a key protein in cell growth and wound healing.
  • Gelatin, a derivative of collagen, is widely used in biomedical applications.
  • Understanding the interaction between bFGF and gelatin is crucial for developing effective drug delivery systems.

Purpose of the Study:

  • To investigate the polyion complexation between basic fibroblast growth factor (bFGF) and gelatin.
  • To elucidate the role of electrostatic interactions in this complexation process.
  • To characterize the impact of pH and ionic strength on the complex formation.

Main Methods:

  • Turbidity measurements of mixed solutions.
  • Heparin high-performance liquid affinity chromatography (HPLAC).

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  • Isoelectric electrophoresis.

    • Main Results:

    • Acidic gelatin (IEP 5.0) formed complexes with bFGF, indicated by increased solution turbidity, while basic gelatin (IEP 9.0) did not.
    • Maximum complexation occurred at a bFGF/gelatin molar ratio of 1.0, with turbidity decreasing as ionic strength increased.
    • Complexation reduced bFGF's affinity for heparin, and the isoelectric point (IEP) of bFGF shifted to a lower value post-complexation.

    Conclusions:

    • Electrostatic interaction is the primary driving force for the complexation between acidic gelatin and basic bFGF.
    • The pH of gelatin is critical for complex formation with bFGF.
    • The findings provide insights into the behavior of bFGF-gelatin complexes in physiological environments.