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Evaluation of Nanoparticle Uptake in Tumors in Real Time Using Intravital Imaging

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Published on: June 21, 2011

Sequential intra-intercellular nanoparticle delivery system for deep tumor penetration.

Caoyun Ju¹, Ran Mo, Jingwei Xue

¹State Key Laboratory of Natural Medicines, Center of Drug Discovery and Department of Pharmaceutics, China Pharmaceutical University, 24 Tong Jia Xiang, Nanjing, 210009 (China).

Angewandte Chemie (International Ed. in English)

|April 18, 2014

Summary

This summary is machine-generated.

This study introduces a pH-responsive nanogel for deep tumor penetration. The nanogel releases drugs inside cancer cells and then infects nearby cells, improving chemotherapy delivery.

Keywords:

antitumor agents drug delivery nanogels pH responsive tumor penetration

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Area of Science:

Biomaterials Science
Nanotechnology
Drug Delivery

Background:

Achieving deep tumor penetration for large nanoparticles (NPs) remains a challenge in cancer therapy.
Sequential delivery systems are needed to overcome biological barriers and enhance therapeutic efficacy.
Nanoparticle-based drug delivery requires precise control over release kinetics and cellular targeting.

Purpose of the Study:

To develop a novel reversible swelling-shrinking nanogel for enhanced tumor penetration and sequential drug delivery.
To engineer nanoparticles capable of responding to the acidic tumor microenvironment for targeted drug release.
To investigate the potential of these nanogels for intra- and intercellular delivery within tumor tissues.

Main Methods:

Fabrication of a nanogel with a polyelectrolyte core (N-lysinal-N'-succinyl chitosan and poly(N-isopropylacrylamide)) and a bovine serum albumin shell.
Characterization of nanogel swelling and shrinking behavior in response to varying pH conditions (acidic vs. neutral).
Evaluation of chemotherapeutic release kinetics and cytotoxicity in cancer cells, followed by assessment of subsequent cellular infection.

Main Results:

The developed nanogel exhibited reversible swelling in acidic conditions and shrinking under neutral pH.
Swelling facilitated rapid release of encapsulated chemotherapeutics within cancer cells, leading to efficient cytotoxicity.
The contractive nanogel, after cell lysis, demonstrated the ability to infect neighboring cancer cells, promoting deeper tumor penetration.

Conclusions:

The pH-responsive nanogel system enables sequential intra- and intercellular delivery, overcoming limitations of deep tumor penetration.
This innovative approach enhances chemotherapeutic efficacy through targeted release and secondary cell infection.
The nanogel design offers a promising strategy for improving nanoparticle-based cancer drug delivery systems.