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Development and optimization of sustained release triptolide microspheres.

Hui-Lin Zeng1, Qian Qiu1, Ting-Xiong Fu1

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Sustained release microspheres of triptolide were developed to improve treatment for rheumatoid arthritis. This formulation offers potential for better bioavailability and patient compliance, though initial burst release requires further investigation.

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Area of Science:

  • Pharmacology
  • Materials Science
  • Drug Delivery

Background:

  • Rheumatoid arthritis is a chronic autoimmune disease causing joint destruction.
  • Triptolide shows therapeutic potential but faces limitations like narrow therapeutic window and poor bioavailability.
  • Current triptolide treatments suffer from side effects and poor patient compliance due to frequent dosing.

Purpose of the Study:

  • To develop and optimize sustained-release triptolide microspheres using poly(lactide-co-glycolide) (PLGA).
  • To address limitations of conventional triptolide formulations, including low bioavailability and poor patient compliance.

Main Methods:

  • Microspheres were prepared using an oil-in-water emulsion solvent evaporation technique with PLGA and polyvinyl alcohol (PVA).
  • Response surface methodology (RSM) with central composite design (CCD) was employed for formulation optimization.
  • Key variables included PVA concentration, PLGA concentration, and theoretical drug content; responses were drug content, encapsulation efficiency, mean diameter, and initial release.

Main Results:

  • The optimized formulation achieved a mean diameter of 42.36 μm, 7.96% drug content, and 80.16% encapsulation efficiency.
  • In vitro studies demonstrated a sustained release profile of triptolide over 4 weeks, fitting the Korsmeyer-Peppas model.
  • A notable initial burst release of approximately 14% was observed, warranting further investigation.

Conclusions:

  • Sustained-release triptolide microspheres represent a viable strategy to enhance oral bioavailability and patient compliance for rheumatoid arthritis treatment.
  • Further research is needed to investigate the initial burst release phenomenon and conduct in vivo evaluations.