Nejvíce citovaný článek - PubMed ID 19022512
Cytotoxicity and immunostimulation: double attack on cancer cells with polymeric therapeutics
The study describes the synthesis, physicochemical properties, and biological evaluation of polymer therapeutics based on N-(2-hydroxypropyl)methacrylamide (HPMA) copolymers intended for a tumor-targeted immuno-oncotherapy. Water-soluble linear and cholesterol-containing HPMA precursors were synthesized using controlled reversible addition-fragmentation chain transfer polymerization to reach molecular weight Mn about 2 × 104 g·mol-1 and low dispersity. These linear or self-assembled micellar conjugates, containing immunomodulatory agent cucurbitacin-D (CuD) or the anticancer drug doxorubicin (Dox) covalently bound by the hydrolytically degradable hydrazone bond, showed a hydrodynamic size of 10-30 nm in aqueous solutions. The CuD-containing conjugates were stable in conditions mimicking blood. Importantly, a massive release of active CuD in buffer mimicking the acidic tumor environment was observed. In vitro, both the linear (LP-CuD) and the micellar (MP-CuD) conjugates carrying CuD showed cytostatic/cytotoxic activity against several cancer cell lines. In a murine metastatic and difficult-to-treat 4T1 mammary carcinoma, only LP-CuD showed an anticancer effect. Indeed, the co-treatment with Dox-containing micellar polymer conjugate and LP-CuD showed potentiation of the anticancer effect. The results indicate that the binding of CuD, characterized by prominent hydrophobic nature and low bioavailability, to the polymer carrier allows a safe and effective delivery. Therefore, the conjugate could serve as a potential component of immuno-oncotherapy schemes within the next preclinical evaluation.
Design, controlled synthesis, physico-chemical and biological characteristics of novel well-defined biodegradable star-shaped copolymers intended for advanced drug delivery is described. These new biocompatible star copolymers were synthesised by grafting monodispersed semitelechelic linear (sL) N-(2-hydroxypropyl)methacrylamide copolymers onto a 2,2-bis(hydroxymethyl)propionic acid (bisMPA)-based polyester dendritic core of various structures. The hydrodynamic diameter of the star copolymer biomaterials can be tuned from 13 to 31 nm and could be adjusted to a given purpose by proper selection of the bisMPA dendritic core type and generation and by considering the sL copolymer molecular weight and polymer-to-core molar ratio. The hydrolytic degradation was proved for both the star copolymers containing either dendron or dendrimer core, showing the spontaneous hydrolysis in duration of few weeks. Finally, it was shown that the therapy with the biodegradable star conjugate with attached doxorubicin strongly suppresses the tumour growth in mice and is fully curative in most of the treated animals at dose corresponding approximately to one fourth of maximum tolerated dose (MTD) value. Both new biodegradable systems show superior efficacy and tumour accumulation over the first generation of star copolymers containing non-degradable PAMAM core.
- Klíčová slova
- Cancer, Doxorubicin, Drug delivery, HPMA, Star-like polymers, bisMPA,
- MeSH
- akrylamidy MeSH
- biokompatibilní materiály * MeSH
- doxorubicin MeSH
- léčivé přípravky * MeSH
- lékové transportní systémy MeSH
- methakryláty MeSH
- myši MeSH
- nádorové buněčné linie MeSH
- nosiče léků MeSH
- polymery MeSH
- zvířata MeSH
- Check Tag
- myši MeSH
- zvířata MeSH
- Publikační typ
- časopisecké články MeSH
- práce podpořená grantem MeSH
- Research Support, N.I.H., Extramural MeSH
- Názvy látek
- akrylamidy MeSH
- biokompatibilní materiály * MeSH
- doxorubicin MeSH
- hydroxypropyl methacrylate MeSH Prohlížeč
- léčivé přípravky * MeSH
- methakryláty MeSH
- N-(2-hydroxypropyl)methacrylamide MeSH Prohlížeč
- nosiče léků MeSH
- polymery MeSH
To avoid the side effects of the anti-cancer drug doxorubicin (Dox), we conjugated this drug to a N-(2-hydroxypropyl)methacrylamide (HPMA) copolymer backbone. Dox was conjugated via an amide bond (Dox-HPMA(AM), PK1) or a hydrazone pH-sensitive bond (Dox-HPMA(HYD)). In contrast to Dox and Dox-HPMA(HYD), Dox-HPMA(AM) accumulates within the cell's intracellular membranes, including those of the Golgi complex and endoplasmic reticulum, both involved in protein glycosylation. Flow cytometry was used to determine lectin binding and cell death, immunoblot to characterize the presence of CD7, CD43, CD44, and CD45, and high-performance anion exchange chromatography with pulsed amperometric detector analysis for characterization of plasma membrane saccharide composition. Incubation of EL4 cells with Dox-HPMA(AM) conjugate, in contrast to Dox or Dox-HPMA(HYD), increased the amounts of membrane surface-associated glycoproteins, as well as saccharide moieties recognized by peanut agglutinin, Erythrina cristagalli, or galectin-1 lectins. Only Dox-HPMA(AM) increased expression of the highly glycosylated membrane glycoprotein CD43, while expression of others (CD7, CD44, and CD45) was unaffected. The binding sites for galectin-1 are present on CD43 molecule. Furthermore, we present that EL4 treated with Dox-HPMA(AM) possesses increased sensitivity to galectin-1-induced apoptosis. In this study, we demonstrate that Dox-HPMA(AM) treatment changes glycosylation of the EL4 T cell lymphoma surface and sensitizes the cells to galectin-1-induced apoptosis.
- MeSH
- amidy chemie MeSH
- antigeny CD43 metabolismus MeSH
- apoptóza MeSH
- doxorubicin analogy a deriváty farmakologie MeSH
- endoplazmatické retikulum metabolismus MeSH
- galektin 1 metabolismus MeSH
- glykosylace MeSH
- Golgiho aparát metabolismus MeSH
- kyseliny polymethakrylové farmakologie MeSH
- lymfom T-buněčný farmakoterapie metabolismus patologie MeSH
- myši MeSH
- nádorové buněčné linie účinky léků MeSH
- nosiče léků MeSH
- proliferace buněk MeSH
- protinádorová antibiotika farmakologie MeSH
- průtoková cytometrie MeSH
- western blotting MeSH
- zvířata MeSH
- Check Tag
- myši MeSH
- zvířata MeSH
- Publikační typ
- časopisecké články MeSH
- práce podpořená grantem MeSH
- Názvy látek
- amidy MeSH
- antigeny CD43 MeSH
- doxorubicin-N-(2-hydroxypropyl)methacrylamide copolymer conjugate MeSH Prohlížeč
- doxorubicin MeSH
- galektin 1 MeSH
- kyseliny polymethakrylové MeSH
- nosiče léků MeSH
- protinádorová antibiotika MeSH
PURPOSE: In vivo efficacy and safety of HPMA-based copolymers armed with doxorubicin via a spacer containing pH-sensitive linkage that can be prepared within a broad range of attached drug contents (1) was tested in murine tumor models. METHODS: Mice bearing T cell lymphoma EL4 or B cell lymphoma 38C13 were treated with a single dose of the conjugate (15, 25, and 75 mg Dox eq./kg i.v.) in a therapeutic regime. Anti-tumor resistance of the cured animals was proved by a second challenge with a lethal dose of tumor cells without additional treatment. RESULTS: The content of drug bound to the polymer is an important parameter in relation to the conjugate therapeutic efficacy. The best anti-tumor effects were produced by conjugates with 10 - 13 wt% of bound doxorubicin. Free doxorubicin up to 4.6% relative to total drug content had no impact on the treatment efficacy and acute toxicity. The conjugates induced a complete cure of mice and regular treatment-dependent development of specific anti-tumor resistance. No myelosuppression or organ damage was observed. CONCLUSIONS: A well-defined HPMA copolymer-doxorubicin conjugate with pH-sensitive drug release is a good candidate for clinical trials as it has remarkable anti-tumor efficacy and a favorable safety profile.
- MeSH
- doxorubicin analogy a deriváty chemická syntéza farmakokinetika farmakologie MeSH
- imunomodulace účinky léků MeSH
- koncentrace vodíkových iontů MeSH
- kyseliny polymethakrylové chemická syntéza farmakokinetika farmakologie MeSH
- myši MeSH
- nádorové buněčné linie MeSH
- nosiče léků chemická syntéza farmakokinetika farmakologie MeSH
- polymery * chemická syntéza farmakokinetika farmakologie MeSH
- proliferace buněk účinky léků MeSH
- protinádorová antibiotika farmakokinetika farmakologie MeSH
- xenogenní modely - testy protinádorové aktivity MeSH
- zvířata MeSH
- Check Tag
- mužské pohlaví MeSH
- myši MeSH
- zvířata MeSH
- Publikační typ
- časopisecké články MeSH
- práce podpořená grantem MeSH
- Názvy látek
- doxorubicin-N-(2-hydroxypropyl)methacrylamide copolymer conjugate MeSH Prohlížeč
- doxorubicin MeSH
- kyseliny polymethakrylové MeSH
- nosiče léků MeSH
- polymery * MeSH
- protinádorová antibiotika MeSH
