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Preparation and Characterization of Individual and Multi-drug Loaded Physically Entrapped Polymeric Micelles
Published on: August 28, 2015
Peptide modified polymeric micelles specific for breast cancer cells
Anu Stella Mathews1, Sahar Ahmed, Mostafa Shahin
1Faculty of Pharmacy and Pharmaceutical Sciences, University of Alberta, Edmonton, Alberta, Canada, T6G 2E1.
Bioconjugate Chemistry
|March 22, 2013
Summary
Novel breast cancer targeting peptides, peptide 11 and peptide 18, were conjugated to polymeric micelles. These targeted micelles showed enhanced uptake in breast cancer cells, indicating potential for improved cancer therapy and diagnosis.
Area of Science:
- Biomaterials Science
- Nanotechnology
- Oncology
Background:
- Developing targeted drug delivery systems is crucial for improving cancer therapy efficacy and reducing side effects.
- Polymeric micelles offer a versatile platform for drug encapsulation and targeted delivery.
- Novel peptides can be engineered to specifically recognize and bind to cancer cells.
Purpose of the Study:
- To evaluate the specific targeting ability of novel breast cancer targeting peptides (peptide 11 and peptide 18) conjugated to polymeric micelles.
- To compare the targeting efficiency of these novel peptides with established peptides (p160 and c-RGD).
- To assess the cellular uptake and selectivity of peptide-modified polymeric micelles in various cancer and non-cancerous cell lines.
Main Methods:
- Synthesis and characterization of poly(ethylene oxide)-b-poly(caprolactone) (PEO-b-PCL) polymeric micelles.
- Conjugation of breast cancer targeting peptides (peptide 11, peptide 18, p160, c-RGD) to polymeric micelles.
- Preparation of physically blended combination micelles.
- Incorporation of a lipophilic fluorescent probe (DiI) to mimic drug loading.
- Analysis of cellular uptake using flow cytometry and confocal microscopy in MDA-MB-435, MDA-MB-231, MCF7, HUVEC, and MCF10A cell lines.
Main Results:
- Polymeric micelles modified with peptide 11 or peptide 18 demonstrated significantly increased uptake in breast cancer cell lines compared to unmodified or p160/c-RGD modified micelles.
- Physically blended combination micelles (comPM11, comPM18) showed higher cellular uptake than covalently conjugated micelles but exhibited lower cancer cell selectivity.
- Structural confirmation, size distribution, and zeta potential of all prepared micellar systems were characterized.
Conclusions:
- Peptide 11 and peptide 18 conjugated to PEO-b-PCL micelles are effective in targeting breast cancer cells.
- These peptide-micelle conjugates represent a promising platform for enhancing the delivery of chemotherapeutic drugs and imaging agents in cancer treatment and diagnostics.
- Further optimization of conjugation methods may improve the selectivity of combination micelles.
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