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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

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Polymeric micelles loaded with platinum anticancer drugs target preangiogenic micrometastatic niches associated with

Hailiang Wu1, Horacio Cabral1, Kazuko Toh2

  • 1Department of Bioengineering, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.

Journal of Controlled Release : Official Journal of the Controlled Release Society
|June 24, 2014
PubMed

Insights

Polymeric micelles loaded with (1,2-diaminocyclohexane)platinum(II) (DACHPt) effectively treated liver metastases. These nanocarriers targeted both overt and preangiogenic metastases by exploiting tumor neovasculature and inflammatory microenvironments, respectively.

Area of Science:

  • Oncology
  • Materials Science
  • Pharmacology

Background:

  • Nanocarriers enhance drug delivery to solid tumors via the enhanced permeability and retention (EPR) effect.
  • Metastasis is a primary cause of cancer mortality, yet nanocarrier targeting of early-stage, preangiogenic micrometastases remains poorly understood.
  • Conventional nanocarriers rely on tumor neovasculature for accumulation, limiting their efficacy against nascent metastatic sites.

Purpose of the Study:

  • To investigate the efficacy of micellar nanocarriers loaded with (1,2-diaminocyclohexane)platinum(II) (DACHPt) for treating liver metastases.
  • To evaluate the targeting mechanisms of these nanocarriers in both overt and preangiogenic metastatic stages.
  • To explore the potential of nanocarriers for early detection and treatment of metastatic disease.

Main Methods:

  • Development of micellar nanocarriers encapsulating DACHPt (DACHPt/m).
  • Intravenous administration of DACHPt/m in a murine colon adenocarcinoma (C-26) liver metastasis model.
  • Assessment of tumor growth inhibition and nanocarrier accumulation in both overt and preangiogenic metastatic stages.
  • Analysis of the correlation between nanocarrier targeting and tumor microenvironment characteristics.

Main Results:

  • DACHPt/m significantly inhibited tumor growth in both overt and preangiogenic liver metastasis models.
  • Targeting of overt metastases was attributed to selective accumulation in neovasculature-rich cancerous tissues.
  • Targeting of preangiogenic metastases was linked to the inflammatory microenvironment of the metastatic niche.
  • Demonstrated nanocarrier accumulation and therapeutic effect in early-stage metastatic lesions.

Conclusions:

  • Polymeric micelles loaded with DACHPt are effective against liver metastases at different stages of development.
  • Nanocarrier targeting mechanisms differ between overt (neovasculature-dependent) and preangiogenic (inflammatory microenvironment-dependent) metastases.
  • This study highlights a novel strategy for targeting preangiogenic micrometastases, potentially enabling earlier diagnosis and treatment of cancer spread.
Keywords:
ChemotherapyCyclooxygenase-2Drug delivery systemMetastatic nicheOxaliplatin

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