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Lomkova EA, Chytil P, Janoušková O, Mueller T, Lucas H, Filippov SK, Trhlíková O, Aleshunin PA, Skorik YA, Ulbrich K, Etrych T. Biodegradable Micellar HPMA-Based Polymer-Drug Conjugates with Betulinic Acid for Passive Tumor Targeting. Biomacromolecules 2016; 17:3493-3507. [PMID: 27636143 DOI: 10.1021/acs.biomac.6b00947] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Here, we present the synthesis, physicochemical, and preliminary biological characterization of micellar polymer-betulinic acid (BA) conjugates based on N-(2-hydroxypropyl)methacrylamide (HPMA) copolymer carriers, enabling the controlled release of cytotoxic BA derivatives in solid tumors or tumor cells. Various HPMA copolymer conjugates differing in the structure of the spacer between the drug and the carrier were synthesized, all designed for pH-triggered drug release in tumor tissue or tumor cells. The high molecular weight of the micellar conjugates should improve the uptake of the drug in solid tumors due to the Enhanced permeability and retention (EPR) effect. Nevertheless, only the conjugate containing BA with methylated carboxyl groups enabled pH-dependent controlled release in vitro. Moreover, drug release led to the disassembly of the micellar structure, which facilitated elimination of the water-soluble HPMA copolymer carrier from the body by renal filtration. The methylated BA derivative and its polymer conjugate exhibited high cytostatic activity against DLD-1, HT-29, and HeLa carcinoma cell lines and enhanced tumor accumulation in HT-29 xenograft in mice.
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Affiliation(s)
- Ekaterina A Lomkova
- Institute of Macromolecular Chemistry, The Czech Academy of Sciences , Heyrovsky Sq. 2, Prague 6, 162 06, Czech Republic.,St. Petersburg State Chemical Pharmaceutical Academy, 14 Prof. Popov St., St. Petersburg 197022, Russian Federation
| | - Petr Chytil
- Institute of Macromolecular Chemistry, The Czech Academy of Sciences , Heyrovsky Sq. 2, Prague 6, 162 06, Czech Republic
| | - Olga Janoušková
- Institute of Macromolecular Chemistry, The Czech Academy of Sciences , Heyrovsky Sq. 2, Prague 6, 162 06, Czech Republic
| | - Thomas Mueller
- Martin-Luther-University Halle-Wittenberg , Department of Internal Medicine IV, Oncology and Haematology, Ernst-Grube-Str. 40, 06120 Halle (Saale), Germany
| | - Henrike Lucas
- Martin-Luther-University Halle-Wittenberg , Institute of Pharmacy, AG Pharmaceutical Technology, Wolfgang-Langenbeck-Str. 4, 06120 Halle (Saale), Germany
| | - Sergey K Filippov
- Institute of Macromolecular Chemistry, The Czech Academy of Sciences , Heyrovsky Sq. 2, Prague 6, 162 06, Czech Republic
| | - Olga Trhlíková
- Institute of Macromolecular Chemistry, The Czech Academy of Sciences , Heyrovsky Sq. 2, Prague 6, 162 06, Czech Republic
| | - Pavel A Aleshunin
- St. Petersburg State Technological Institute (Technical University), 26 Moskovsky Pr., St. Petersburg, 190013, Russian Federation
| | - Yury A Skorik
- St. Petersburg State Chemical Pharmaceutical Academy, 14 Prof. Popov St., St. Petersburg 197022, Russian Federation.,Institute of Macromolecular Compounds, Russian Academy of Sciences , 31 Bolshoy pr. VO, St. Petersburg 199004, Russian Federation
| | - Karel Ulbrich
- Institute of Macromolecular Chemistry, The Czech Academy of Sciences , Heyrovsky Sq. 2, Prague 6, 162 06, Czech Republic
| | - Tomáš Etrych
- Institute of Macromolecular Chemistry, The Czech Academy of Sciences , Heyrovsky Sq. 2, Prague 6, 162 06, Czech Republic
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