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Related Experiment Videos

Tissue response to biodegradable injectable microcapsules.

G E Visscher1, M A Robison, G J Argentieri

  • 1Department of Drug Safety and Metabolism, Sandoz Research Institute, East Hanover, NJ 07936.

Journal of Biomaterials Applications
|July 1, 1987
PubMed
Summary

Biodegradable microcapsules show minimal initial inflammation and degrade over time. This suggests a safe profile for sustained drug delivery applications, with complete tissue resolution expected.

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Area of Science:

  • Biomaterials Science
  • Drug Delivery Systems
  • Tissue Engineering

Background:

  • Biodegradable microcapsules are utilized for sustained drug delivery.
  • Understanding the in vivo tissue response is crucial for safety and efficacy.

Purpose of the Study:

  • To evaluate the tissue response to intramuscularly injected biodegradable microcapsules.
  • To assess the degradation profile and long-term biocompatibility of these microcapsules.

Main Methods:

  • Intramuscular injection of microcapsules made from various polymers in experimental models.
  • Histological evaluation of tissue response at different time points post-injection.
  • Assessment of microcapsule degradation and associated cellular reactions (macrophages, giant cells, connective tissue).

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Main Results:

  • Observed a minimal, localized acute inflammatory response upon injection.
  • Demonstrated a diminishing cellular response (macrophages, foreign body giant cells) over time.
  • Confirmed microcapsule degradation and absence of fibrous capsule formation, indicating complete tissue resolution.

Conclusions:

  • Biodegradable microcapsules elicit a transient and resolving inflammatory response.
  • The observed biocompatibility supports their use in sustained medicinal agent delivery.
  • Complete resolution of tissue reactions is achievable, dependent on the polymer properties.