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Related Experiment Videos

Controlled release of polypeptides from polyanhydrides

E Ron1, T Turek, E Mathiowitz

  • 1Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge 02138.

Proceedings of the National Academy of Sciences of the United States of America
|May 1, 1993
PubMed
Summary

Highly hydrophobic polymers effectively protect encapsulated proteins like recombinant bovine somatotropin and zinc insulin, ensuring their intact release over three weeks. This polymer hydrophobicity enhances protein stability and integrity during delivery.

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Area of Science:

  • Biomaterials Science
  • Protein Chemistry
  • Drug Delivery Systems

Background:

  • Polymer-encapsulation is a key strategy for protein drug delivery.
  • Maintaining protein integrity during release is critical for therapeutic efficacy.
  • The influence of polymer properties on protein stability requires further investigation.

Purpose of the Study:

  • To investigate the impact of polymer hydrophobicity on protein release and integrity.
  • To evaluate the role of stabilizers in conjunction with polymer properties.
  • To explore methods for enhancing protein stability within polymer matrices.

Main Methods:

  • Utilized highly hydrophobic poly[1,3-bis(p-carboxyhydroxy)hexane anhydride].
  • Incorporated sucrose as an excipient for protein stabilization.

Related Experiment Videos

  • Assessed protein integrity using acidic reverse-phase HPLC, size-exclusion HPLC, radioimmunoassay, and conformation-sensitive immunoassays.

    • Main Results:

    • Recombinant bovine somatotropin and zinc insulin were released intact over a three-week period.
    • The released proteins maintained their structural and functional integrity, confirmed by multiple analytical techniques.
    • Polymer hydrophobicity was identified as a significant factor in preserving protein stability.

    Conclusions:

    • Highly hydrophobic polymers, when formulated with appropriate excipients like sucrose, can ensure the stable and intact release of encapsulated proteins.
    • Polymer hydrophobicity offers a promising approach to enhance protein stability in delivery systems.
    • This study provides insights into optimizing polymer-based protein delivery systems for improved therapeutic outcomes.