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Szabó I, Orbán E, Schlosser G, Hudecz F, Bánóczi Z. Cell-penetrating conjugates of pentaglutamylated methotrexate as potential anticancer drugs against resistant tumor cells. Eur J Med Chem 2016; 115:361-8. [PMID: 27031212 DOI: 10.1016/j.ejmech.2016.03.034] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2016] [Revised: 02/28/2016] [Accepted: 03/14/2016] [Indexed: 12/27/2022]
Abstract
The emerging resistance of tumor cells against methotrexate (MTX) is one of the major limitations of the MTX treatment of tumorous diseases. The disturbance in the polyglutamation which is a main step in the mechanism of methotrexate action is often the reason of the resistance. Delivery of polyglutamylated MTX into cells may evade the mechanisms that are responsible for drug resistance. In this study conjugates of methotrexate and its pentaglutamylated derivatives with cell-penetrating peptides - penetratin and octaarginine - were investigated. The cellular-uptake and in vitro cytostatic activity of conjugates were examined on breast cancer cell cultures (MDA-MB-231 as resistant and MCF-7 as sensitive cell culture). These cell cultures showed very different behaviour towards the conjugates. Although the presence of pentaglutamyl moiety significantly decreased the internalisation of conjugates, some of them were significantly active in vitro. All of the conjugates were able to penetrate in some extent into both cell types, but only the conjugates of penetratin showed in vitro cytostatic activity. The most effective conjugates were the MTX-Glu5-Penetratin(desMet) and MTX-Glu5-GFLG-Penetratin(desMet). The latter was effective on both cell cultures while the former was active only on the resistant tumor cells. Our results suggest that the translocation of polyglutamylated MTX may be a new way to treat sensitive and more importantly resistant tumors. While both penetratin and octaarginine peptides were successfully used to deliver several kinds of cargos earlier in our case the activity of penetratin conjugates was more pronounced.
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Affiliation(s)
- Ildikó Szabó
- MTA-ELTE Research Group of Peptide Chemistry, Budapest, Hungary
| | - Erika Orbán
- MTA-ELTE Research Group of Peptide Chemistry, Budapest, Hungary
| | - Gitta Schlosser
- MTA-ELTE Research Group of Peptide Chemistry, Budapest, Hungary
| | - Ferenc Hudecz
- MTA-ELTE Research Group of Peptide Chemistry, Budapest, Hungary; Department of Organic Chemistry, Eötvös L. University, Budapest, Hungary
| | - Zoltán Bánóczi
- MTA-ELTE Research Group of Peptide Chemistry, Budapest, Hungary; Department of Organic Chemistry, Eötvös L. University, Budapest, Hungary.
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Paul A, James C, Heenan RK, Schweins R. Drug Mimic Induced Conformational Changes in Model Polymer−Drug Conjugates Characterized by Small-Angle Neutron Scattering. Biomacromolecules 2010; 11:1978-82. [DOI: 10.1021/bm1003338] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- A. Paul
- School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff, CF10 3AT, United Kingdom, ISIS Facility, STFC, Rutherford Appleton Laboratories, Chilton, Didcot, Oxfordshire, OX11 0QX, United Kingdom, and Institute Laue-Langevin, BP 156, 6, rue Jules Horowitz, 38042 Grenoble Cedex 9, France
| | - C. James
- School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff, CF10 3AT, United Kingdom, ISIS Facility, STFC, Rutherford Appleton Laboratories, Chilton, Didcot, Oxfordshire, OX11 0QX, United Kingdom, and Institute Laue-Langevin, BP 156, 6, rue Jules Horowitz, 38042 Grenoble Cedex 9, France
| | - R. K. Heenan
- School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff, CF10 3AT, United Kingdom, ISIS Facility, STFC, Rutherford Appleton Laboratories, Chilton, Didcot, Oxfordshire, OX11 0QX, United Kingdom, and Institute Laue-Langevin, BP 156, 6, rue Jules Horowitz, 38042 Grenoble Cedex 9, France
| | - R. Schweins
- School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff, CF10 3AT, United Kingdom, ISIS Facility, STFC, Rutherford Appleton Laboratories, Chilton, Didcot, Oxfordshire, OX11 0QX, United Kingdom, and Institute Laue-Langevin, BP 156, 6, rue Jules Horowitz, 38042 Grenoble Cedex 9, France
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Hudecz F, Reményi J, Szabó R, Kóczán G, Mezo G, Kovács P, Gaál D. Drug targeting by macromolecules without recognition unit? J Mol Recognit 2003; 16:288-98. [PMID: 14523942 DOI: 10.1002/jmr.639] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
his review will summarize available information on the ability of macromolecular conjugates containing no specific recognition motifs to deliver anthracyclines (daunomycin, adriamycin) or methotrexate to target cells such as tumour cells or macrophages. Conjugates with natural (proteins, DNA, carbohydrates) and synthetic macromolecules (linear and branched chain poly-alpha-amino acids, non-biodegradable DIVEMA, HPMA etc.) will be reviewed. Experimental data from several laboratories indicate that these conjugates are taken up by cells mainly by fluid-phase or adsorptive endocytosis. It is believed that these processes do not involve 'specific receptors'. Two examples of methotrexate and daunomycin conjugates will be discussed to show the effect of the chemical structure of branched chain polypeptides on the uptake and antitumour or antiparasitic (Leishmania donovani infection) efficacy of conjugates.
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Affiliation(s)
- Ferenc Hudecz
- Research Group of Peptide Chemistry, Hungarian Academy of Sciences, Eötvös L University, Budapest, Hungary.
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Ismail AA, Mantsch HH. Salt bridge induced changes in the secondary structure of ionic polypeptides. Biopolymers 1992; 32:1181-6. [PMID: 1384749 DOI: 10.1002/bip.360320907] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
The carboxylate-containing homopolypeptides poly(L-glutamate) [poly(Glu)] and poly(L-aspartate) [poly(Asp)] were found to form different types of ordered structures in the presence of poly(L-lysine) [poly(Lys)]. Mixing poly(Glu) with poly(Lys) in aqueous solution at neutral pH results in the instantaneous formation of a gel-like precipitate. The secondary structure of the gel precipitate can be best described as intermolecular antiparallel beta-strands, involving the backbone amide groups, as evidenced by the presence of characteristic amide I bands in the ir spectrum at 1684 and 1612 cm-1. Mixing poly(Asp) with poly(Lys) under identical conditions results in the formation of a fine precipitate with a different morphology. Examination of the ir spectrum of the precipitate revealed that unlike poly(Glu), poly(Asp) did not yield any discrete secondary structure upon precipitation with poly(Lys). Addition of solutions containing Ca2+ or Mg2+ to the poly(Glu)/poly(Lys) aggregates resulted in complete dissolution of the gel, with the disappearance of the ir bands characteristic of the intermolecular hydrogen-bonded network. The results demonstrate the importance of salt bridges in establishing strong hydrogen bonds between the backbone amide groups. Reaggregation occurred upon heating the poly(Glu)/poly(Lys) mixture in the presence of Ca2+, but not in the presence of Mg2+ ions. In the presence of Ca2+ ions, aggregation and formation of an extended hydrogen-bonded network occurred upon heating. The aggregates formed upon heating poly(Glu)/poly(Lys) in the presence of Ca2+ were attributed solely to complexation of Ca2+ to the carboxylate groups of poly(Glu) with poly(Lys) remaining free in solution. Dissolution of the aggregate could be accomplished through addition of Mg2+ at room temperature.
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Affiliation(s)
- A A Ismail
- Institute for Biodiagnostics, National Research Council of Canada, Winnipeg, Manitoba
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Search for new anti-tumor drugs among compounds inhibiting enzymes involved in folic acid metabolism (a review). Pharm Chem J 1991. [DOI: 10.1007/bf00777683] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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