1
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A couple of antitumor Pd(II) complexes make DNA-refolding and HSA-unfolding: Experimental and docking studies. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2021.118450] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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2
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Franich AA, Živković MD, Milovanović J, Arsenijević D, Arsenijević A, Milovanović M, Djuran MI, Rajković S. In vitro cytotoxic activities, DNA- and BSA-binding studies of dinuclear palladium(II) complexes with different pyridine-based bridging ligands. J Inorg Biochem 2020; 210:111158. [DOI: 10.1016/j.jinorgbio.2020.111158] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2020] [Revised: 06/18/2020] [Accepted: 06/21/2020] [Indexed: 02/06/2023]
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3
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New minor groove covering DNA binding mode of dinuclear Pt(II) complexes with various pyridine-linked bridging ligands and dual anticancer-antiangiogenic activities. J Biol Inorg Chem 2020; 25:395-409. [PMID: 32162071 DOI: 10.1007/s00775-020-01770-7] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2019] [Accepted: 02/25/2020] [Indexed: 12/11/2022]
Abstract
New anticancer platinum(II) compounds simultaneously targeting tumor cells and tumor-derived neoangiogenesis, with new DNA interacting mode and large therapeutic window are appealing alternative to improve efficacy of clinical platinum chemotherapeutics. Herein, we describe three novel dinuclear [{Pt(en)Cl}2(μ-L)]2+ complexes with different pyridine-like bridging ligands (L), 4,4'-bipyridine (Pt1), 1,2-bis(4-pyridyl)ethane (Pt2) and 1,2-bis(4-pyridyl)ethene (Pt3), which highly, positively charged aqua derivatives, [{Pt(en)(H2O)}2(μ-L)]4+, interact with the phosphate backbone forming DNA-Pt adducts with an unique and previously undescribed binding mode, called a minor groove covering. The results of this study suggested that the new binding mode of the aqua-Pt(II) complexes with DNA could be attributed to the higher anticancer activities of their chloride analogues. All three compounds, particularly complex [{Pt(en)Cl}2(μ-4,4'-bipy)]Cl2·2H2O (4,4'-bipy is 4,4'-bipyridine) (Pt1), overcame cisplatin resistance in vivo in the zebrafish-mouse melanoma xenograft model, showed much higher therapeutic potential than antiangiogenic drug sunitinib malate, while effectively blocking tumor neovascularization and melanoma cell metastasis. Overall therapeutic profile showed new dinuclear Pt(II) complexes could be novel, effective and safe anticancer agents. Finally, the correlation with the structural characteristics of these complexes can serve as a useful tool for developing new and more effective anticancer drugs.
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4
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Kimutai B, He CC, Roberts A, Jones ML, Bao X, Jiang J, Yang Z, Rodgers MT, Chow CS. Amino acid-linked platinum(II) compounds: non-canonical nucleoside preferences and influence on glycosidic bond stabilities. J Biol Inorg Chem 2019; 24:985-997. [PMID: 31359185 PMCID: PMC6806012 DOI: 10.1007/s00775-019-01693-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2019] [Accepted: 07/14/2019] [Indexed: 12/18/2022]
Abstract
Abstract Nucleobases serve as ideal targets where drugs bind and exert their anticancer activities. Cisplatin (cisPt) preferentially coordinates to 2′-deoxyguanosine (dGuo) residues within DNA. The dGuo adducts that are formed alter the DNA structure, contributing to inhibition of function and ultimately cancer cell death. Despite its success as an anticancer drug, cisPt has a number of drawbacks that reduce its efficacy, including repair of adducts and drug resistance. Some approaches to overcome this problem involve development of compounds that coordinate to other purine nucleobases, including those found in RNA. In this work, amino acid-linked platinum(II) (AAPt) compounds of alanine and ornithine (AlaPt and OrnPt, respectively) were studied. Their reactivity preferences for DNA and RNA purine nucleosides (i.e., 2′-deoxyadenosine (dAdo), adenosine (Ado), dGuo, and guanosine (Guo)) were determined. The chosen compounds form predominantly monofunctional adducts by reacting at the N1, N3, or N7 positions of purine nucleobases. In addition, features of AAPt compounds that impact the glycosidic bond stability of Ado residues were explored. The glycosidic bond cleavage is activated differentially for AlaPt-Ado and OrnPt-Ado isomers. Formation of unique adducts at non-canonical residues and subsequent destabilization of the glycosidic bonds are important features that could circumvent platinum-based drug resistance. Graphic abstract ![]()
Electronic supplementary material The online version of this article (10.1007/s00775-019-01693-y) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Bett Kimutai
- Department of Chemistry, Wayne State University, Detroit, MI, 48202, USA
| | - C C He
- Department of Chemistry, Wayne State University, Detroit, MI, 48202, USA
| | - Andrew Roberts
- Department of Chemistry, Wayne State University, Detroit, MI, 48202, USA
| | - Marcel L Jones
- Department of Chemistry, Wayne State University, Detroit, MI, 48202, USA
| | - Xun Bao
- Department of Chemistry, Wayne State University, Detroit, MI, 48202, USA
| | - Jun Jiang
- Department of Chemistry, Wayne State University, Detroit, MI, 48202, USA
| | - Zhihua Yang
- Department of Chemistry, Wayne State University, Detroit, MI, 48202, USA
| | - M T Rodgers
- Department of Chemistry, Wayne State University, Detroit, MI, 48202, USA
| | - Christine S Chow
- Department of Chemistry, Wayne State University, Detroit, MI, 48202, USA.
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5
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Štarha P, Vančo J, Trávníček Z. Platinum complexes containing adenine-based ligands: An overview of selected structural features. Coord Chem Rev 2017. [DOI: 10.1016/j.ccr.2016.09.017] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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6
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Riddell IA, Johnstone TC, Park GY, Lippard SJ. Nucleotide Binding Preference of the Monofunctional Platinum Anticancer-Agent Phenanthriplatin. Chemistry 2016; 22:7574-81. [PMID: 27111128 PMCID: PMC4884344 DOI: 10.1002/chem.201600236] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2016] [Indexed: 11/10/2022]
Abstract
The monofunctional platinum anticancer agent phenanthriplatin generates covalent adducts with the purine bases guanine and adenine. Preferential nucleotide binding was investigated by using a polymerase stop assay and linear DNA amplification with a 163-base pair DNA double helix. Similarly to cisplatin, phenanthriplatin forms the majority of adducts at guanosine residues, but significant differences in both the number and position of platination sites emerge when comparing results for the two complexes. Notably, the monofunctional complex generates a greater number of polymerase-halting lesions at adenosine residues than does cisplatin. Studies with 9-methyladenine reveal that, under abiological conditions, phenanthriplatin binds to the N(1) or N(7) position of 9-methyladenine in approximately equimolar amounts. By contrast, comparable reactions with 9-methylguanine afforded only the N(7) -bound species. Both of the 9-methyladenine linkage isomers (N(1) and N(7) ) exist as two diastereomeric species, arising from hindered rotation of the aromatic ligands about their respective platinum-nitrogen bonds. Eyring analysis of rate constants extracted from variable-temperature NMR spectroscopic data revealed that the activation energies for ligand rotation in the N(1) -bound platinum complex and the N(7) -linkage isomers are comparable. Finally, a kinetic analysis indicated that phenanthriplatin reacts more rapidly, by a factor of eight, with 9-methylguanine than with 9-methyladenine, suggesting that the distribution of lesions formed on double-stranded DNA is kinetically controlled. In addition, implications for the potent anticancer activity of phenanthriplatin are discussed herein.
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Affiliation(s)
- Imogen A Riddell
- Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA, 02139-4307, USA
| | - Timothy C Johnstone
- Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA, 02139-4307, USA
| | - Ga Young Park
- Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA, 02139-4307, USA
| | - Stephen J Lippard
- Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA, 02139-4307, USA.
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7
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Musumeci D, Platella C, Riccardi C, Merlino A, Marzo T, Massai L, Messori L, Montesarchio D. A first-in-class and a fished out anticancer platinum compound: cis-[PtCl2(NH3)2] and cis-[PtI2(NH3)2] compared for their reactivity towards DNA model systems. Dalton Trans 2016; 45:8587-600. [PMID: 27126508 DOI: 10.1039/c6dt00294c] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Contrary to what was believed for many years, cis-PtI2(NH3)2, the diiodido analogue of cisplatin, displays high in vitro antiproliferative activity toward a set of tumour cell lines, overcoming resistance to cisplatin in a platinum-resistant cancer cell line. In the context of a general reappraisal of iodinated Pt(ii) derivatives, aiming at a more systematic evaluation of their chemical and biological profiles, here we report on the reactivity of cis-PtI2(NH3)2 with selected DNA model systems, in single, double strand or G-quadruplex form, using cisplatin as a control. A combined approach has been exploited in this study, including circular dichroism (CD), UV-visible spectroscopy and electrospray mass spectrometry (ESI-MS) analyses. The data reveal that cis-PtI2(NH3)2 shows an overall reactivity towards the investigated oligonucleotides significantly higher than cisplatin.
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Affiliation(s)
- Domenica Musumeci
- Department of Chemical Sciences, University of Napoli Federico II, Via Cintia, 21, I-80126 Napoli, Italy.
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8
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Elucidating the reactivity of Pt(II) complexes with (O,S) bidentate ligands towards DNA model systems. J Inorg Biochem 2016; 160:198-209. [PMID: 26921982 DOI: 10.1016/j.jinorgbio.2016.02.013] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2015] [Revised: 02/01/2016] [Accepted: 02/10/2016] [Indexed: 01/01/2023]
Abstract
In the search for novel platinum-based anticancer therapeutic agents, we have recently established a structural motif of (O,S) bidentate ligands bound to a Pt(II) metal center which is effective against various cancer cell lines. Aiming at further enhancing the cytotoxicity of metal-based drugs, the identification of potential biological targets and elucidation of the mode of action of selected lead compounds is of utmost importance. Here we report our studies on the DNA interaction of three representative Pt(II) complexes of the investigated series, using various model systems and analytical techniques. In detail, CD spectroscopy as well as ESI-MS and MS(2) techniques were applied to gain an overall picture of the binding properties of this class of (O,S) bidentate Pt(II) compounds with defined oligonucleotide sequences in single strand, duplex or G-quadruplex form, as well as with the nucleobase 9-methylguanine. On the whole, it was demonstrated that the tested compounds interact with DNA and produce conformational changes of different extents depending on the sequence and structure of the examined oligonucleotide. Guanine was established as the preferential target within the DNA sequence, but in the absence or unavailability of guanines, alternative binding sites can be addressed. The implications of these results are thoroughly discussed.
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9
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Bhanuchandra M, Kuram MR, Sahoo AK. Silver(I)-Catalyzed Reaction between Pyrazole and Propargyl Acetates: Stereoselective Synthesis of the Scorpionate Ligands (E)-Allyl-gem-dipyrazoles (ADPs). J Org Chem 2013; 78:11824-34. [DOI: 10.1021/jo401867e] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- M. Bhanuchandra
- School
of Chemistry, University of Hyderabad, Hyderabad 500046, India
| | | | - Akhila K. Sahoo
- School
of Chemistry, University of Hyderabad, Hyderabad 500046, India
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10
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Yue H, Yang B, Wang Y, Chen G. Investigations of the binding of [Pt2(DTBPA)Cl2](II) and [Pt2(TPXA)Cl2](II) to DNA via various cross-linking modes. Int J Mol Sci 2013; 14:19556-86. [PMID: 24077126 PMCID: PMC3821573 DOI: 10.3390/ijms141019556] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2013] [Revised: 08/14/2013] [Accepted: 09/10/2013] [Indexed: 12/14/2022] Open
Abstract
We have constructed models for a series of platinum-DNA adducts that represent the binding of two agents, [Pt2(DTBPA)Cl2](II) and [Pt2(TPXA)Cl2](II), to DNA via inter- and intra-strand cross-linking, and carried out molecular dynamics simulations and DNA conformational dynamics calculations. The effects of trans- and cis-configurations of the centers of these di-nuclear platinum agents, and of different bridging linkers, have been investigated on the conformational distortions of platinum-DNA adducts formed via inter- and intra-strand cross-links. The results demonstrate that the DNA conformational distortions for the various platinum-DNA adducts with differing cross-linking modes are greatly influenced by the difference between the platinum-platinum distance for the platinum agent and the platinum-bound N7–N7 distance for the DNA molecule, and by the flexibility of the bridging linkers in the platinum agent. However, the effects of trans/cis-configurations of the platinum-centers on the DNA conformational distortions in the platinum-DNA adducts depend on the inter- and intra-strand cross-linking modes. In addition, we discuss the relevance of DNA base motions, including opening, shift and roll, to the changes in the parameters of the DNA major and minor grooves caused by binding of the platinum agent.
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Affiliation(s)
| | | | - Yan Wang
- Authors to whom correspondence should be addressed; E-Mails: (Y.W.); (G.C.); Tel.: +86-10-5880-5247 (Y.W.); +86-10-5880-5424 (G.C.); Fax: +86-10-5880-2075 (Y.W. & G.C.)
| | - Guangju Chen
- Authors to whom correspondence should be addressed; E-Mails: (Y.W.); (G.C.); Tel.: +86-10-5880-5247 (Y.W.); +86-10-5880-5424 (G.C.); Fax: +86-10-5880-2075 (Y.W. & G.C.)
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11
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Jarocka I, Gęgotek A, Bielawska A, Bielawski K, Łuczaj W, Hodun T, Skrzydlewska E. Effect of novel dinuclear platinum(II) complexes on redox status of MOLT-4 leukemic cells. Toxicol Mech Methods 2013; 23:641-9. [DOI: 10.3109/15376516.2013.825359] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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12
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Ghosh I, Nau WM. The strategic use of supramolecular pK(a) shifts to enhance the bioavailability of drugs. Adv Drug Deliv Rev 2012; 64:764-83. [PMID: 22326487 DOI: 10.1016/j.addr.2012.01.015] [Citation(s) in RCA: 256] [Impact Index Per Article: 21.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2011] [Revised: 01/19/2012] [Accepted: 01/27/2012] [Indexed: 01/27/2023]
Abstract
Macrocyclic hosts of the cyclodextrin, sulfonatocalixarene, and cucurbituril type can be employed as discrete supramolecular drug delivery systems, thereby complementing existing supramolecular drug formulation strategies based on polymers, hydrogels, liposomes, and related microheterogeneous systems. Cucurbiturils, in particular, stand out in that they do not only provide a hydrophobic cavity to encapsulate the drug in the form of a host-guest complex, but in that they possess cation-receptor properties, which favor the encapsulation of protonated drugs over their unprotonated forms, resulting in pronounced pK(a) shifts up to 5 units. These pK(a) shifts can be rationally exploited to activate prodrug molecules, to stabilize the active form of drug molecules, to enhance their solubility, and to increase their degree of ionization, factors which can jointly serve to enhance the bioavailability of drugs, particularly weakly basic ones. Additionally, macrocycles can serve to increase the chemical stability of drugs by protecting them against reactions with nucleophiles (e.g., thiols) and electrophiles, by increasing their photostability, and by causing a higher thermal stability in the solid state. Detailed examples of the different effects of macrocyclic encapsulation of drugs and the associated pK(a) shifts are provided and discussed. Other important considerations, namely a potential lowering of the bioactivity of drugs by macrocyclic complexation, interferences of the macrocycles with biocatalytic processes, the toxicity of the macrocyclic host molecules, and problems and opportunities related to a targeted release and the rate of release of the drug from the host-guest complexes are critically evaluated.
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Affiliation(s)
- Indrajit Ghosh
- School of Engineering and Science, Jacobs University Bremen, D-28759 Bremen, Germany
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13
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Scaffidi-Domianello YY, Legin AA, Jakupec MA, Roller A, Kukushkin VY, Galanski M, Keppler BK. Novel oximato-bridged platinum(II) di- and trimer(s): synthetic, structural, and in vitro anticancer activity studies. Inorg Chem 2012; 51:7153-63. [PMID: 22691006 DOI: 10.1021/ic300148e] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Novel platinum complexes of trans geometry [PtCl(2){(Z)-R(H)C═NOH}(2)] [R = Me (1), Et (3)] and [PtCl(2){(E)-R(H)C═NOH}{(Z)-R(H)C═NOH}] [R = Me (2), Et (4)] as well as the classic trans-[PtCl(2)(R(2)C═NOH)(2)] [R = Me, Et] were reacted with an equivalent amount of silver acetate in acetone solution at ambient temperature, resulting in formation of unprecedented head-to-tail-oriented oximato-bridged dimers [PtCl{μ-(Z)-R(H)C═NO}{(Z)-R(H)C═NOH}](2) [R = Me (5), Et (7)], [PtCl{μ-(Z)-R(H)C═NO}{(E)-R(H)C═NOH}](2) [R = Me (6), Et (8)], and [PtCl(μ-R(2)C═NO)(R(2)C═NOH)](2) [R = Me (9), Et (10)], correspondingly. The dimeric species feature a unique six-membered diplatinacycle and represent the first example of oxime ligands coordinated to platinum via the oxygen atom. All complexes were characterized by elemental analyses, electrospray ionization mass spectrometry, IR and multinuclear ((1)H, (13)C, and (195)Pt) NMR spectroscopy, as well as X-ray diffraction in the cases of dimers 6 and 9. Furthermore, the crystal and molecular structures of a trimeric oximato-bridged complex 11 comprising three platinum units connected in a chain way were established. The cytotoxicity of both dimers and the respective monomers was comparatively evaluated in three human cancer cell lines: cisplatin-sensitive CH1 cells as well as cisplatin-resistant SW480 and A549 cells, whereupon structure-activity relationships were drawn. Thus, it was found that dimerization results in a substantial (up to 7-fold) improvement of IC(50) values of (aldoxime)Pt(II) compounds, whereas for the analogous complexes featuring ketoxime ligands the reverse trend was observed. Remarkably, the novel dimers yielded no cross-resistance with cisplatin in SW480 cells, exhibiting up to 2-fold enhanced cytotoxicity in comparison with the CH1 cell line and thereby possessing a promising potential to overcome resistance toward platinum anticancer drugs. The latter point was also confirmed by investigating the potency of apoptosis induction in the case of one monomer as well as one dimer; the investigated complexes proved to be strong apoptotic agents which could induce cell death even in the cisplatin-resistant SW480 cell line.
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Qu Y, Moniodis JJ, Harris AL, Yang X, Hegmans A, Povirk LF, Berners-Price SJ, Farrell NP. Non-Covalent Polynuclear Platinum Compounds as Polyamine Analogs. POLYAMINE DRUG DISCOVERY 2011. [DOI: 10.1039/9781849733090-00191] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Polynuclear platinum compounds (PPCs) represent a discrete class of antitumor agents that bear structural resemblance to polyamines. This chapter reviews developments on the chemistry and biology of polynuclear platinum drugs and especially the recognition that “non-covalent” agents based on this motif represent a further challenge to the structure-activity paradigms for platinum antitumor agents. Pt-DNA bond formation is not a strict requirement for DNA affinity leading to manifestation of promising cytotoxicity and antitumor activity. Non-covalent PPCs bind to DNA in a non-covalent manner through a novel binding motif, the phosphate clamp, analogous to the arginine fork. This binding mode is discrete from “classical” intercalation and minor groove binding. In solution, analysis of 1-D and 2-D 1HNMR data places the compounds in the minor groove of the DNA, spanning several base pairs. A melphalan protection assay indicated that the complex was at least as effective in blocking melphalan access to the minor groove as distamycin. Further biological consequences of the structure are remarkably enhanced cellular accumulation, further distinguishing the non-covalent group as a unique class of agents.
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Affiliation(s)
- Yun Qu
- Department of Chemistry Virginia Commonwealth University, Richmond, VA 23284-2006 Australia
| | - Joseph J. Moniodis
- Chemistry M313 School of Biomedical, Biomolecular & Chemical Sciences, University of Western Australia, Crawley, WA 6009 Australia
| | - Amanda L. Harris
- Department of Chemistry Virginia Commonwealth University, Richmond, VA 23284-2006 Australia
| | - Xiaohong Yang
- Department of Chemistry Virginia Commonwealth University, Richmond, VA 23284-2006 Australia
| | - Alex Hegmans
- Department of Chemistry Virginia Commonwealth University, Richmond, VA 23284-2006 Australia
| | - Lawrence F. Povirk
- Department of Pharmacology 380A Goodwin Laboratory, Massey Cancer Center, Virginia Commonwealth University, 401 College St., Richmond, VA 23298-0035 USA
| | - Susan J. Berners-Price
- Chemistry M313 School of Biomedical, Biomolecular & Chemical Sciences, University of Western Australia, Crawley, WA 6009 Australia
- Institute of Glycomics Griffith University, Gold Coast Campus, Qld. 4222 Australia
| | - Nicholas P. Farrell
- Department of Chemistry Virginia Commonwealth University, Richmond, VA 23284-2006 Australia
- Institute of Glycomics Griffith University, Gold Coast Campus, Qld. 4222 Australia
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15
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Montagner D, Marzano C, Gandin V. Synthesis, characterization and cytotoxic activity of palladium (II) dithiocarbamate complexes with α,ω-diamines. Inorganica Chim Acta 2011. [DOI: 10.1016/j.ica.2011.07.031] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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16
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Komeda S, Moulaei T, Chikuma M, Odani A, Kipping R, Farrell NP, Williams LD. The phosphate clamp: a small and independent motif for nucleic acid backbone recognition. Nucleic Acids Res 2010; 39:325-36. [PMID: 20736180 PMCID: PMC3017591 DOI: 10.1093/nar/gkq723] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
The 1.7 Å X-ray crystal structure of the B-DNA dodecamer, [d(CGCGAATTCGCG)]2 (DDD)-bound non-covalently to a platinum(II) complex, [{Pt(NH3)3}2-µ-{trans-Pt(NH3)2(NH2(CH2)6NH2)2}](NO3)6 (1, TriplatinNC-A,) shows the trinuclear cation extended along the phosphate backbone and bridging the minor groove. The square planar tetra-am(m)ine Pt(II) units form bidentate N-O-N complexes with OP atoms, in a Phosphate Clamp motif. The geometry is conserved and the interaction prefers O2P over O1P atoms (frequency of interaction is O2P > O1P, base and sugar oxygens > N). The binding mode is very similar to that reported for the DDD and [{trans-Pt(NH3)2(NH2(CH2)6(NH3+)}2-µ-{trans-Pt(NH3)2(NH2(CH2)6NH2)2}](NO3)8 (3, TriplatinNC), which exhibits in vivo anti-tumour activity. In the present case, only three sets of Phosphate Clamps were found because one of the three Pt(II) coordination spheres was not clearly observed and was characterized as a bare Pt2+ ion. Based on the electron density, the relative occupancy of DDD and the sum of three Pt(II) atoms in the DDD-1 complex was 1:1.69, whereas the ratio for DDD-2 was 1:2.85, almost the mixing ratio in the crystallization drop. The high repetition and geometric regularity of the motif suggests that it can be developed as a modular nucleic acid binding device with general utility.
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Affiliation(s)
- Seiji Komeda
- School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, GA 30332-0400, USA
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17
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Substituted 9-aminoacridine-4-carboxamides tethered to platinum(II)diamine complexes: Chemistry, cytotoxicity and DNA sequence selectivity. J Inorg Biochem 2010; 104:815-9. [PMID: 20494445 DOI: 10.1016/j.jinorgbio.2010.03.011] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2009] [Revised: 02/16/2010] [Accepted: 03/19/2010] [Indexed: 11/24/2022]
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18
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Gao EJ, Yin HX, Zhu MC, Sun YG, Gu XF, Wu Q, Ren LX. Study on the interaction of a palladium complex with DNA. J STRUCT CHEM+ 2009. [DOI: 10.1007/s10947-008-0177-2] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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19
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Kravtsov IV, Baranin SV, Belyakov PA, Dorokhov VA. Boron-chelate assisted synthesis of di[pyrazol-3(5)-yl]methane and 1,1’,2,2’-tetra[pyrazol-3(5)-yl]ethane. MENDELEEV COMMUNICATIONS 2009. [DOI: 10.1016/j.mencom.2009.01.011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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20
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Mello LD, Ribeiro ES, Kubota LT, Elmroth SKC, Pereira RMS. Electrochemical and spectroscopic evidences of the interaction between DNA and Pt(II)(dppf)-complex. Biometals 2008; 22:385-92. [DOI: 10.1007/s10534-008-9175-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2008] [Accepted: 10/14/2008] [Indexed: 12/31/2022]
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21
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Tsuchimoto T, Aoki K, Wagatsuma T, Suzuki Y. Lewis Acid Catalyzed Addition of Pyrazoles to Alkynes: Selective Synthesis of Double and Single Addition Products. European J Org Chem 2008. [DOI: 10.1002/ejoc.200800353] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Krause-Heuer AM, Grant MP, Orkey N, Aldrich-Wright JR. Drug Delivery Devices and Targeting Agents for Platinum(II) Anticancer Complexes. Aust J Chem 2008. [DOI: 10.1071/ch08157] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
An ideal platinum-based delivery device would be one that selectively targets cancerous cells, can be systemically delivered, and is non-toxic to normal cells. It would be beneficial to provide drug delivery devices for platinum-based anticancer agents that exhibit high drug transport capacity, good water solubility, stability during storage, reduced toxicity, and enhanced anticancer activity in vivo. However, the challenges for developing drug delivery devices include carrier stability in vivo, the method by which extracellular or intracellular drug release is achieved, overcoming the various mechanisms of cell resistance to drugs, controlled drug release to cancer cells, and platinum drug bioavailability. There are many potential candidates under investigation including cucurbit[n]urils, cyclodextrins, calix[n]arenes, and dendrimers, with the most promising being those that are synthetically adaptable enough to attach to targeting agents.
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Ali MS, Longoria E, Ely TO, Whitmire KH, Khokhar AR. Homopiperazine Pt(II) adducts with DNA bases and nucleosides: Crystal structure of [PtII(homopiperazine)(9-ethylguanine)2](NO3)2. Polyhedron 2006. [DOI: 10.1016/j.poly.2006.01.003] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Wheate NJ, Buck DP, Day AI, Collins JG. Cucurbit[n]uril binding of platinum anticancer complexes. Dalton Trans 2005:451-8. [PMID: 16395444 DOI: 10.1039/b513197a] [Citation(s) in RCA: 151] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The encapsulation of cisplatin by cucurbit[7]uril (Q[7]) and multinuclear platinum complexes linked via a 4,4'-dipyrazolylmethane (dpzm) ligand by Q[7] and cucurbit[8]uril (Q[8]) has been studied by NMR spectroscopy and molecular modelling. The NMR studies suggest that some cisplatin binds in the cucurbituril cavity, while cis-[PtCl(NH3)2(H2O)]+ only binds at the portals. Alternatively, the dpzm-linked multinuclear platinum complexes are quantitatively encapsulated within the cavities of both Q[7] and Q[8]. Upon encapsulation, the non-exchangeable proton resonances of the multinuclear platinum complexes show significant upfield shifts in 1H NMR spectra. The H3/H3* resonances shift upfield by 0.08 to 0.55 ppm, the H5/H5* shift by 0.9 to 1.6 ppm, while the methylene resonances shift by 0.74 to 0.88 ppm. The size of the resonance shift is dependent on the cavity size of the encapsulating cucurbituril, with Q[7] encapsulation producing larger shifts than Q[8]. The upfield shifts of the dpzm resonances observed upon cucurbituril encapsulation indicate that the Q[7] or Q[8] is positioned directly over the dpzm linking ligand. The terminal platinum groups of trans-[{PtCl(NH3)2}2 mu-dpzm]2+ (di-Pt) and trans-[trans-{PtCl(NH3)2}2-trans-{Pt(dpzm)2(NH3)2}]4+ (tri-Pt) provide a barrier to the on and off movement of cucurbituril, resulting in binding kinetics that are slow on the NMR timescale for the metal complex. Although the dpzm ligand has relatively few rotamers, encapsulation by the larger Q[8] resulted in a more compact di-Pt conformation with each platinum centre retracted further into each Q[8] portal. Encapsulation of the hydrolysed forms of di-Pt and tri-Pt is considerably slower than for the corresponding Cl forms, presumably due to the high-energy cost of passing the +2 platinum centres through the cucurbituril portals. The results of this study suggest that cucurbiturils could be suitable hosts for the pharmacological delivery of multinuclear platinum complexes.
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Affiliation(s)
- Nial J Wheate
- School of Physical, Environmental and Mathematical Sciences, University College, University of New South Wales, Australian Defence Force Academy, Canberra, ACT 2600, Australia
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