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Related Experiment Videos

Bioabsorbable polyphosphazene matrices as systems for calcitonin controlled release

P Caliceti1, N Nicoli Aldini, M Fini

  • 1Department of Pharmaceutical Sciences, University of Padova, Italy.

Farmaco (Societa Chimica Italiana : 1989)
|April 29, 1998
PubMed
Summary

Bioabsorbable polyphosphazene matrices effectively delivered calcitonin for controlled release in osteoporotic rats. This system demonstrated good biocompatibility and improved bone density after two months of treatment.

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Area of Science:

  • Biomaterials Science
  • Pharmacology
  • Osteoporosis Research

Background:

  • Osteoporosis treatment often requires effective drug delivery systems.
  • Calcitonin is a peptide hormone used to treat bone diseases.
  • Developing sustained-release formulations for calcitonin is crucial for therapeutic efficacy.

Purpose of the Study:

  • To develop and evaluate a bioabsorbable polyphosphazene matrix for controlled calcitonin delivery.
  • To assess the in vitro release profile and in vivo biocompatibility of the matrices.
  • To investigate the therapeutic effect of calcitonin-loaded matrices on bone density in an osteoporotic rat model.

Main Methods:

  • Fabrication of 80 mg polyphosphazene matrices with 50 or 250 micrograms of calcitonin.
  • In vitro release studies to determine peptide release kinetics.

Related Experiment Videos

  • Surgical implantation of matrices in osteoporotic female rats (treatment and control groups).
  • Histological evaluation of explanted matrices and surrounding tissues, and residual calcitonin dosage.
  • Densitometric analysis of femoral bone to assess therapeutic effects.

    • Main Results:

    • Polyphosphazene matrices exhibited an initial release burst followed by slow peptide release over weeks in vitro.
    • In vivo studies demonstrated good biocompatibility of the matrices with host tissues.
    • Complete calcitonin release was observed within 30 days post-implantation.
    • A significant improvement in femoral bone densitometry was noted in treated rats compared to controls after 60 days.

    Conclusions:

    • Bioabsorbable polyphosphazene matrices serve as a suitable and biocompatible delivery system for calcitonin.
    • The controlled release formulation effectively improved bone mineral density in an osteoporotic rat model.
    • This system holds promise for the long-term management of osteoporosis through sustained calcitonin delivery.