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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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Electrostatic interactions between polyglutamic acid and polylysine yields stable polyion complex micelles for
Yutong Wang1,2,3, Liping Huang1,2, Yan Shen1,2
1Center for Research Development and Evaluation of Pharmaceutical Excipients and Generic Drugs, China Pharmaceutical University.
International Journal of Nanomedicine
|November 15, 2017
Summary
Methoxy poly(ethylene glycol)-poly(d,l-lactide) copolymers formed stable polyion complex micelles (PCMs) for enhanced drug delivery. These deoxypodophyllotoxin-loaded PCMs demonstrated improved stability, pH-triggered release, and potent antitumor effects.
Area of Science:
- Materials Science
- Nanotechnology
- Biomedical Engineering
Background:
- Polymeric micelles (PMs) based on poly(ethylene glycol)-poly(d,l-lactide) (PEG-PDLLA) offer potential for drug delivery.
- Enhancing the physical stability of these nanocarriers is crucial for effective therapeutic applications.
- Polyion complexation presents a strategy to stabilize micellar structures.
Purpose of the Study:
- To develop physically stable polymeric micelles (PMs) using a blend of methoxy PEG-PDLLA-polyglutamate (mPEG-PDLLA-PLG) and mPEG-PDLLA-poly(l-lysine) (mPEG-PDLLA-PLL) copolymers.
- To investigate the characteristics and performance of deoxypodophyllotoxin (DPT)-loaded polyion complex micelles (DPT-PCMs).
- To evaluate the stability, drug release profile, antitumor efficacy, and biocompatibility of the developed DPT-PCMs.
Main Methods:
- Synthesis and characterization of mPEG-PDLLA-PLG and mPEG-PDLLA-PLL copolymers using 1H-NMR, IR spectroscopy, and GPC.
- Preparation of DPT-loaded PMs (DPT-PCMs) via dialysis.
- Morphological and size analysis of DPT-PCMs using transmission electron microscopy (TEM).
- Assessment of DPT-PCM stability under varying temperatures and pH conditions.
- Evaluation of in vitro antitumor effect and in vivo biocompatibility.
Main Results:
- Spherical DPT-PCMs with uniform distribution and a particle size of 36.3±0.8 nm were successfully prepared.
- DPT-PCMs exhibited significantly enhanced physical stability compared to nonpeptide-modified DPT-PMs across different temperatures.
- The charged peptides induced pH sensitivity, leading to a pH-triggered release profile and enhanced antitumor activity.
- In vivo studies confirmed the retention of dynamic characteristics and high biocompatibility of DPT-PCMs.
Conclusions:
- The combination of anionic and cationic charged polyionic segments is an effective strategy for improving the stability of polymer-based nanocarriers.
- Polyion complexation enhances the physical stability and enables controlled drug release from PEG-PDLLA micelles.
- The developed DPT-PCMs show promise for improved cancer therapy due to enhanced stability, targeted release, and potent antitumor effects.
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