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The Tumor Microenvironment02:17

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Updated: Dec 25, 2025

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Tumor Microenvironment Stimuli-Responsive Nanoparticles for Programmed Anticancer Drug Delivery.

Nan Jia1, Wenpan Li1, Dan Liu1

  • 1School of Pharmacy, Shenyang Pharmaceutical University, 103 Wenhua Road, Shenyang, Liaoning Province 110016, China.

Molecular Pharmaceutics
|April 4, 2020
PubMed
Summary

New hypersensitive nanoparticles improve chemotherapy by releasing drugs specifically in the tumor microenvironment. This programmed delivery enhances antitumor efficacy and reduces side effects of doxorubicin (DOX) in solid tumors.

Keywords:
PAMAM dendrimerscharge-switchablepH-sensitive nanoparticlessize-shrinkabletumor infiltration

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Area of Science:

  • Biomaterials Science
  • Nanotechnology
  • Drug Delivery Systems

Background:

  • Large nanoparticles offer prolonged circulation but hinder tissue penetration and cellular uptake.
  • Optimizing nanodrug delivery requires balancing circulation time, tumor penetration, and cellular uptake.
  • The tumor microenvironment presents unique challenges and opportunities for targeted drug delivery.

Purpose of the Study:

  • To design and synthesize hypersensitive nanoparticles for programmed doxorubicin (DOX) delivery.
  • To create nanoparticles that respond to the tumor microenvironment for enhanced therapeutic outcomes.
  • To reconcile the conflicting requirements of nanodrug delivery systems for improved cancer treatment.

Main Methods:

  • Synthesis of a supersensitive polymer, poly(2-ethyl-2-oxazoline)-poly(methacryloyl sulfadimethoxine) (PEOz-b-PSD).
  • Formation of PEOz-b-PSD/polyamidoamine/DOX (PEPSD/PAM/DOX) nanoparticles via electrostatic adsorption.
  • Evaluation of nanoparticle behavior and drug release in physiological and tumor microenvironments.

Main Results:

  • PEPSD/PAM/DOX nanoparticles exhibited prolonged circulation in physiological environments.
  • In the tumor microenvironment, nanoparticles underwent rapid charge reversal and size reduction, enhancing tumor accumulation and penetration.
  • Rapid drug release was observed within tumor cells due to the polyamidoamine (PAMAM) proton sponge effect.
  • Significant enhancement in in vivo antitumor efficacy and reduced cardiotoxicity of DOX were demonstrated.

Conclusions:

  • Ultrasensitive nanoparticles designed for the tumor microenvironment can effectively overcome limitations of traditional nanodrug delivery.
  • Programmed DOX delivery via these nanoparticles significantly improves antitumor efficacy in solid tumors.
  • The developed nanoparticles offer a promising strategy for enhancing cancer treatment while minimizing systemic toxicity.