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Targetable HPMA copolymer-adriamycin conjugates. Recognition, internalization, and subcellular fate
V Omelyanenko1, P Kopecková, C Gentry
1Department of Pharmaceutics and Pharmaceutical Chemistry, University of Utah, Salt Lake City 84112, USA.
Summary
N-(2-hydroxypropyl)methacrylamide (HPMA) copolymer conjugates demonstrate targeted delivery and intracellular release of anticancer drugs. This approach shows potential for overcoming multidrug resistance by evading efflux pumps.
Area of Science:
- Polymer chemistry and drug delivery
- Cancer biology and therapeutics
- Cellular and molecular pharmacology
Background:
- N-(2-hydroxypropyl)methacrylamide (HPMA) copolymers are investigated as drug delivery vehicles.
- Targeted delivery of anticancer agents is crucial for improving efficacy and reducing side effects.
- Multidrug resistance (MDR) mediated by P-glycoprotein efflux pumps limits chemotherapy effectiveness.
Purpose of the Study:
- To investigate the cellular uptake, trafficking, and intracellular fate of HPMA copolymer conjugates in cancer cells.
- To evaluate the targeting potential of galactosamine (GalN) and monoclonal antibodies (Ab) conjugated to HPMA copolymers.
- To assess the efficacy of HPMA copolymer-drug conjugates in overcoming P-glycoprotein-mediated multidrug resistance.
Main Methods:
- Synthesis of HPMA copolymer conjugates with N-acylated galactosamine (GalN) or OV-TL16 antibodies (Ab).
- Confocal fluorescence microscopy and fluorescence spectroscopy to track fluorescently labeled conjugates (fluorescein or adriamycin [ADR]).
- Incubation of conjugates with human hepatocarcinoma HepG2, ovarian carcinoma OVCAR-3, and multidrug-resistant (A2780/AD) cell lines.
Main Results:
- HPMA copolymer-ADR-GalN conjugates were recognized, internalized, and trafficked to lysosomes in HepG2 cells, releasing ADR into the cytoplasm and nucleus.
- Antibody-targeted HPMA copolymer conjugates showed similar uptake and trafficking patterns in OVCAR-3 cells.
- Preliminary data suggest higher intracellular adriamycin retention in MDR cells when delivered via HPMA copolymer conjugates compared to free ADR.
Conclusions:
- HPMA copolymer conjugates facilitate targeted cellular uptake and intracellular drug release in cancer cells.
- The polymer-drug conjugate system shows promise in bypassing P-glycoprotein efflux pumps, potentially overcoming multidrug resistance.
- Further investigation into HPMA copolymer-drug conjugates is warranted for developing novel anticancer therapies.