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Preparation and Characterization of Individual and Multi-drug Loaded Physically Entrapped Polymeric Micelles
Published on: August 28, 2015
MPEG-DSPE polymeric micelle for translymphatic chemotherapy of lymph node metastasis
Xue Li1, Qing Dong1, Zhiqiang Yan2
1Key Laboratory of Smart Drug Delivery, Department of Pharmaceutics, School of Pharmacy, Fudan University, 826 Zhangheng Road, Shanghai 201203, China.
Abstract:
Lymph node metastasis is one of the major pathways for tumor formation and it is difficult to deliver chemotherapeutics at therapeutic concentrations to lymph node metastasis. This study prepared methyl poly(ethylene glycol)-distearoylphosphatidylethanolamine/doxorubicin (MPEG-DSPE/DOX) micelle for the treatment of lymph node metastasis. The MPEG-DSPE/DOX micelle prepared were of spherical morphology with a particle size of 20 ± 5 nm. The uptake rates of DOX and MPEG-DSPE/DOX micelle by A375 cells were 51.2% and 88.7%, respectively. The phagocytosis rate of MPEG-DSPE/Rhodamine B micelle by RAW264.7 cells was 17.2-fold lower than for Rhodamine B alone. After subcutaneous injection, MPEG-DSPE micelle underwent lymphatic absorption and accumulated in popliteal lymph nodes. MPEG-DSPE/DOX micelle significantly alleviated damage to the subcutaneous tissue of the injection sites compared with DOX alone. We established a model of nude mice bearing lymph node metastasis of A375 cells. After subcutaneous injection, the weights of both the popliteal and iliac lymph nodes of the MPEG-DSPE/DOX micelle group were significantly lower than in the saline and DOX groups. MPEG-DSPE/DOX micelle effectively killed the tumor cells in popliteal and iliac lymph nodes. In conclusion, MPEG-DSPE micelle is a promising drug delivery system for the treatment of lymph node metastasis.
Insights
This study developed a novel micelle drug delivery system for treating lymph node metastasis. The methyl poly(ethylene glycol)-distearoylphosphatidylethanolamine/doxorubicin (MPEG-DSPE/DOX) micelle effectively targets and treats lymph node tumors.
Area of Science:
- Biomedical Engineering
- Nanotechnology
- Oncology
Background:
- Lymph node metastasis is a critical pathway for cancer spread, posing challenges for effective chemotherapy delivery.
- Current chemotherapeutic strategies struggle to achieve therapeutic concentrations within lymph node metastases.
- Developing targeted drug delivery systems is crucial for improving treatment efficacy and reducing side effects.
Purpose of the Study:
- To prepare and evaluate methyl poly(ethylene glycol)-distearoylphosphatidylethanolamine/doxorubicin (MPEG-DSPE/DOX) micelles for treating lymph node metastasis.
- To assess the cellular uptake, lymphatic absorption, and anti-tumor efficacy of the MPEG-DSPE/DOX micelle system.
- To compare the therapeutic effects and local tissue damage of MPEG-DSPE/DOX micelles with free doxorubicin.
Main Methods:
- Synthesis and characterization of MPEG-DSPE/DOX micelles, including morphology and particle size analysis.
- In vitro studies assessing cellular uptake by A375 cells and phagocytosis by RAW264.7 cells.
- In vivo studies in a nude mouse model of lymph node metastasis, evaluating lymphatic absorption, accumulation, and anti-tumor activity.
Main Results:
- MPEG-DSPE/DOX micelles exhibited spherical morphology with a particle size of 20 ± 5 nm.
- Enhanced cellular uptake of doxorubicin by A375 cells when encapsulated in micelles (88.7% vs 51.2%).
- Reduced phagocytosis of micelles by macrophages compared to free dye, indicating improved stealth properties.
- Demonstrated lymphatic absorption and accumulation in popliteal lymph nodes after subcutaneous injection.
- Significantly reduced local tissue damage at injection sites compared to free doxorubicin.
- In vivo studies showed significantly reduced lymph node weights in the MPEG-DSPE/DOX micelle group, indicating effective tumor inhibition.
- MPEG-DSPE/DOX micelles effectively eradicated tumor cells within the popliteal and iliac lymph nodes.
Conclusions:
- MPEG-DSPE/DOX micelle formulation is a promising nanocarrier for targeted delivery of doxorubicin to lymph node metastases.
- This drug delivery system enhances therapeutic efficacy while minimizing local tissue damage.
- The study highlights the potential of MPEG-DSPE micelles as a viable strategy for managing lymph node metastasis in cancer therapy.
