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A Proteoliposome-Based Efflux Assay to Determine Single-molecule Properties of Cl- Channels and Transporters
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Tumor Site-Dependent Transport Properties Determine Nanotherapeutics Delivery and Its Efficacy

Megumi Kai1, Arturas Ziemys1, Yan Ting Liu1

  • 1Department of Nanomedicine, Houston Methodist Research Institute, 6670 Bertner Street, Houston, TX 77030, USA.

Translational Oncology
|June 23, 2019
PubMed

Insights

PEGylated liposomal doxorubicin (PLD) effectively treats primary tumors but not liver metastases. Tumor site-specific transport properties, not cell resistance, dictate PLD delivery and therapeutic efficacy.

Area of Science:

  • Oncology
  • Nanomedicine
  • Pharmacology

Background:

  • Systemic anticancer drug delivery to tumors is often insufficient, leading to resistance.
  • Nanotherapeutics like PEGylated liposomal doxorubicin (PLD) aim to improve tumor accumulation via the enhanced permeation and retention effect.
  • Current clinical outcomes for PLD are modest and vary significantly between tumors.

Purpose of the Study:

  • To investigate if the delivery and efficacy of PLD are dependent on the tumor site.
  • To understand the factors contributing to heterogeneous therapeutic outcomes of PLD.

Main Methods:

  • Establishment of orthotopic primary breast cancer and liver metastasis models in mice using 4T1 cells.
  • Administration of PLD and assessment of therapeutic effects.
  • Analysis of tumor transport properties, including PLD delivery, vascular function, permeability, and mechanical pressure.

Main Results:

  • PLD demonstrated significant therapeutic effects in primary mammary tumors.
  • PLD showed minimal therapeutic effects in liver metastases.
  • Differences in efficacy were attributed to tumor site-dependent transport properties, not intrinsic cancer cell resistance.

Conclusions:

  • Tumor site significantly influences the transport properties of nanotherapeutics like PLD.
  • Factors such as PLD delivery amount, vascular function, permeability, and pressure vary by tumor location.
  • Tumor transport properties can serve as predictive markers for nanotherapeutic delivery and efficacy.

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