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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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Tunable pH-Responsive Polymeric Micelle for Cancer Treatment
Xiaolan Zhang1, Yixian Huang2, Mohammed Ghazwani3
1Center for Pharmacogenetics, ‡Department of Pharmaceutical Sciences, School of Pharmacy, and §University of Pittsburgh Cancer Institute, University of Pittsburgh, Pittsburgh, Pennsylvania 15261, United States.
ACS Macro Letters
|May 21, 2022
Summary
Researchers developed novel pH-sensitive micelles for drug delivery. These micelles, loaded with paclitaxel (PTX), showed enhanced antitumor activity in acidic conditions, demonstrating potential for targeted cancer therapy.
Area of Science:
- Biomaterials Science
- Polymer Chemistry
- Nanotechnology
Background:
- Bioresponsive polymers are crucial for advanced drug delivery systems.
- Developing stimuli-responsive materials enhances therapeutic efficacy and reduces side effects.
- pH-sensitive materials are particularly promising for targeting acidic tumor microenvironments.
Purpose of the Study:
- To construct and characterize novel pH-sensitive micelles for drug delivery.
- To investigate the tunable cleavability of hydrazone linkers in response to pH changes.
- To evaluate the potential of these micelles as carriers for anticancer drugs like paclitaxel (PTX).
Main Methods:
- Synthesis of pH-sensitive micelles by conjugating polyethylene glycol (PEG) with a farnesylthiosalicylate derivative (FTS-H) via a hydrazone linker.
- Assessment of micelle hydrolysis rates under neutral and acidic conditions.
- Evaluation of antitumor activity of FTS-H loaded micelles.
- Loading and triggered release studies of paclitaxel (PTX) from the micelles in acidic environments.
Main Results:
- A series of pH-sensitive micelles were successfully constructed.
- The cleavability of the hydrazone linker was modulated by structural modifications.
- The PHF-2 micelle formulation demonstrated high sensitivity to acidic conditions and stability in neutral pH.
- PHF-2 micelles retained the antitumor activity of FTS-H and showed enhanced efficacy when loaded with PTX, attributed to a combinational effect.
Conclusions:
- Novel pH-sensitive micelles utilizing PEG and FTS-H with a tunable hydrazone linker were developed.
- The PHF-2 micelle system exhibits promising characteristics for targeted drug delivery in acidic tumor environments.
- PTX-loaded PHF-2 micelles demonstrate superior antitumor activity compared to free PTX, suggesting potential for combination therapy.
