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Related Experiment Videos

Testosterone delivery using glutamide-based complex high axial ratio microstructures.

A S Goldstein1, J K Amory, S M Martin

  • 1Departments of Chemistry and Biochemistry, University of Washington, Box 351700, Seattle, WA 98195-1700, USA.

Bioorganic & Medicinal Chemistry
|October 13, 2001
PubMed
Summary

Complex high axial ratio microstructures (CHARMs) effectively delivered testosterone in vivo. Testosterone-loaded CHARMs demonstrated biphasic release kinetics and sustained presence at the injection site in rats.

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Area of Science:

  • Biomaterials Science
  • Drug Delivery Systems
  • Endocrinology

Background:

  • Complex high axial ratio microstructures (CHARMs) offer potential for controlled substance delivery.
  • Testosterone replacement therapy requires effective and sustained delivery methods.

Purpose of the Study:

  • To evaluate CHARMs for in vivo testosterone delivery.
  • To investigate methods for incorporating testosterone into CHARMs.
  • To characterize the release kinetics and in vivo persistence of testosterone from CHARMs.

Main Methods:

  • Testosterone was incorporated into CHARMs via noncovalent mixing or covalent attachment to form a prodrug monomer.
  • In vitro hydrolysis resistance of testosterone-loaded CHARMs was assessed.
  • In vivo testosterone release and pharmacokinetics were studied in rats following injection.

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Main Results:

  • Covalently attached testosterone-loaded CHARMs exhibited resistance to in vitro hydrolysis.
  • In vivo administration resulted in biphasic testosterone release: an initial burst followed by a slow-release phase.
  • CHARM material remained at the injection site for at least 9 days.

Conclusions:

  • Testosterone-loaded CHARMs are a viable system for in vivo testosterone delivery.
  • Covalent attachment enhances the stability of testosterone within CHARMs.
  • The biphasic release profile and prolonged local persistence suggest potential for sustained testosterone therapy.