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Updated: Dec 29, 2025
Preparation and Characterization of Lipophilic Doxorubicin Pro-drug Micelles
Published on: August 2, 2016
Highly loaded deoxypodophyllotoxin nano-formulation delivered by methoxy polyethylene glycol-block-poly (D,L-lactide)
Chang Zu1, Yinglan Yu1, Caiwei Yu2
1Department of Pharmaceutics, China Pharmaceutical University, Nanjing, China.
Abstract:
Cancer is a kind of malignant diseases that threatens human health and the research application of anti-tumor drug therapeutics is growingly always been focused on. Many new compounds with great anticancer activity were synthesized but cannot be hard to be developed into clinical use due to its poor water solubility. Deoxypodophyllotoxin (DPT) is just an example. We develop lyophilized Deoxypodophyllotoxin (DPT) loaded polymeric micelles using methoxy polyethylene glycol-block-Poly (D, L-lactide) (mPEG-PLA). DPT-PM freeze-dried powder was successfully prepared using optimized formulation. mPEG-PLA was added to hydration media before hydrating as cryoprotectants. The freeze-dried powder exhibited white pie-solid without collapsing, and the particle size of DPT-PM reconstituted with water was about 20-35 nm. The entrapment efficiency of the reconstituted solution was 98%, which shows no differences with the micelles before lyophilization. In-vitro cytotoxicity and cellular uptake studies showed that DPT-PM has a higher degree of cytotoxicity comparing with DPT and mPEG-PLA micelles and uptake of mPEG-PLA was concentration and time-dependent. In vivo characterization of DPT-PM was done for pharmacokinetics behaviors, antitumor activity and safety. The obtained results showed significant improvement in plasma clearance bioavailability (p <0.05) and prolonged blood circulation time comparing with DPT-HP-β-CD. Moreover, mPEG-PLA micelles had a better degree of anti-tumor efficacy, this was due to better accumulation of mPEG-PLA in tumor cell via enhanced permeability and retention (EPR) effect. Therefore, DPT-PM has great clinical value, and can be expected to be a novel antitumor preparation.
Insights
Lyophilized Deoxypodophyllotoxin (DPT)-loaded polymeric micelles (DPT-PM) were developed to overcome poor water solubility. DPT-PM showed enhanced cytotoxicity, improved bioavailability, and superior antitumor efficacy in vivo.
Area of Science:
- Nanotechnology in drug delivery
- Polymeric micelles for cancer therapy
- Pharmacokinetics and antitumor efficacy
Background:
- Poor water solubility of anticancer compounds like Deoxypodophyllotoxin (DPT) limits their clinical application.
- Polymeric micelles offer a promising nanocarrier system to improve drug solubility and delivery.
- Methoxy polyethylene glycol-block-Poly (D, L-lactide) (mPEG-PLA) is a suitable material for formulating stable micelles.
Purpose of the Study:
- To develop and characterize lyophilized Deoxypodophyllotoxin (DPT)-loaded polymeric micelles (DPT-PM) using mPEG-PLA.
- To evaluate the in vitro cytotoxicity and cellular uptake of DPT-PM.
- To assess the in vivo pharmacokinetics, antitumor activity, and safety of DPT-PM.
Main Methods:
- Formulation of DPT-loaded mPEG-PLA micelles and subsequent lyophilization with cryoprotectants.
- Characterization of particle size, entrapment efficiency, in vitro cytotoxicity, and cellular uptake.
- In vivo studies including pharmacokinetic analysis, antitumor efficacy assessment, and safety evaluation.
Main Results:
- Successfully prepared stable, lyophilized DPT-PM with particle size of 20-35 nm and 98% entrapment efficiency.
- DPT-PM exhibited significantly higher in vitro cytotoxicity and cellular uptake compared to free DPT.
- In vivo studies demonstrated improved bioavailability, prolonged circulation time, and enhanced antitumor efficacy of DPT-PM, attributed to the EPR effect.
Conclusions:
- Lyophilized DPT-PM formulation effectively overcomes the poor water solubility of DPT.
- DPT-PM shows significant potential as a novel, clinically valuable antitumor preparation.
- The mPEG-PLA micelle system enhances the therapeutic efficacy of DPT through improved delivery and tumor accumulation.
