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Preparation and Characterization of Individual and Multi-drug Loaded Physically Entrapped Polymeric Micelles
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Preparation and Characterization of Individual and Multi-drug Loaded Physically Entrapped Polymeric Micelles

Published on: August 28, 2015

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Hydrogen-bonded and reduction-responsive micelles loading atorvastatin for therapy of breast cancer metastasis

Pengfei Xu1, Haijun Yu1, Zhiwen Zhang1

  • 1Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 201203, China.

Biomaterials
|June 6, 2014
PubMed

Insights

A novel nano-drug delivery system effectively suppresses breast cancer metastasis. This system, loaded with atorvastatin calcium (Ator), shows high efficacy and minimal toxicity by targeting cancer cells and reducing metastasis-promoting proteins.

Area of Science:

  • Biomedical Engineering
  • Nanotechnology
  • Oncology

Background:

  • Metastasis is a primary challenge in breast cancer therapy, often limiting drug efficacy and causing toxicity.
  • Existing treatments for cancer metastasis face hurdles in clinical translation due to toxicity and low effectiveness.

Purpose of the Study:

  • To develop a nano-drug delivery system for efficient suppression of breast cancer metastasis.
  • To load atorvastatin calcium (Ator) into a novel micelle system for enhanced therapeutic outcomes.

Main Methods:

  • Constructed a nano-drug delivery system using mPEG-s-s-VES (PSV) copolymer to form atorvastatin calcium-loaded PSV micelles (ASM).
  • Evaluated ASM's colloidal stability, drug loading, encapsulation efficiency, and in vitro drug release.
  • Assessed the inhibition of 4T1 breast cancer cell migration and invasion, and evaluated metastatic blocking in a 4T1 orthotropic model.
  • Investigated the underlying molecular mechanisms, including the downregulation of MMP-9, Twist, and uPA proteins.

Main Results:

  • ASM exhibited good colloidal stability, high drug loading (up to 50%), and excellent encapsulation efficiency (99.09%).
  • ASM efficiently released Ator intracellularly and significantly inhibited 4T1 cell migration (79.2%) and invasion (88.5%).
  • In vivo studies demonstrated complete blockage of lung and liver metastasis with minimal toxicity, attributed to enhanced Ator accumulation in target tissues.
  • Confirmed downregulation of metastasis-promoting proteins MMP-9, Twist, and uPA.

Conclusions:

  • The developed Ator-loaded PSV micelles (ASM) represent a promising nano-drug delivery system for breast cancer metastasis therapy.
  • ASM offers enhanced efficacy and reduced toxicity compared to free Ator, highlighting its potential for clinical application.
  • The system effectively targets metastatic pathways, providing a novel strategy for managing advanced breast cancer.
Keywords:
AtorvastatinMetastasisMicellesPolyethylene glycol-s-s-vitamin E succinateReduction-responsive

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