Interactions of Anticancer Active Platinum(II) Complexes with DNA PDF Download

Author: Johan Kjellström
Publisher:
ISBN: 9789162850562
Category :
Languages : en
Pages : 62

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Author: Anna Ericson
Publisher:
ISBN: 9789162828110
Category :
Languages : en
Pages : 107

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Author: Seiji Komeda
Publisher:
ISBN:
Category :
Languages : en
Pages : 181

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Author: Laura Schubert
Publisher:
ISBN:
Category : Cancer
Languages : en
Pages : 0

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Author: Bernhard Lippert
Publisher: John Wiley & Sons
ISBN: 9783906390208
Category : Medical
Languages : en
Pages : 628

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30 years after its discovery as an antitumor agent, cisplatin represents today one of the most successful drugs in chemotherapy. This book is intended to reminisce this event, to take inventory, and to point out new lines of development in this field. Divided in 6 sections and 22 chapters, the book provides an up-to-date account on topics such as - the chemistry and biochemistry of cisplatin, - the clinical status of Pt anticancer drugs, - the impact of cisplatin on inorganic and coordination chemistry, - new developments in drug design, testing and delivery. It also includes a chapter describing the historical development of the discovery of cisplatin. The ultimate question - How does cisplatin kill a cell? - is yet to be answered, but there are now new links suggesting how Pt binding to DNA may trigger a cascade of cellular reactions that eventually result in apoptosis. p53 and a series of damage recognition proteins of the HMG-domain family appear to be involved. The book addresses the problem of mutagenicity of Pt drugs and raises the question of the possible relevance of the minor DNA adducts, e.g. of interstrand cross-links, and the possible use of trans-(NH3)2Pt(II)-modified oligonucleotides in antisense and antigene strategies. Our present understanding of reactions of cisplatin with DNA is based upon numerous model studies (from isolated model nucleobases to short DNA fragments) and application of a large body of spectroscopic and other physico-chemical techniques. Thanks to these efforts there is presently no other metal ion whose reactions with nucleic acids are better understood than Pt. In a series of chapters, basic studies on the interactions of Pt electrophiles with nucleobases, oligonucleotides, DNA, amino acids, peptides and proteins are reported, which use, among others, sophisticated NMR techniques or X-ray crystallography, to get remarkable understanding of details on such reactions. Reactivity of cisplatin, once bound to DNA and formerly believed to be inert enough to stay, is an emerging phenomenon. It has (not yet) widely been studied but is potentially extremely important. Medicinal bioinorganic chemistry - the role of metal compounds in medicine - has received an enormous boost from cisplatin, and so has bioinorganic chemistry as a whole. There is hardly a better example than cisplatin to demonstrate what bioinorganic chemistry is all about: The marriage between classic inorganic (coordination) chemistry and the other life sciences - medicine, pharmacy, biology, biochemistry. Cisplatin has left its mark also on areas that are generally considered largely inorganic. The subject of mixed-valance Pt compounds is an example: From the sleeping beauty it made its way to the headlines of scientific journals, thanks to a class of novel Pt antitumor agents, the so-called "platinum pyrimidine blues". In the aftermath diplatinum (III) compounds were recognized and studies in large numbers, and now an organometalic chemistry of these diplatinum (III) species is beginning to emerge. The final section of the book is concerned with new developments such as novel di- and trinuclear Pt(II) drugs with DNA binding properties different from those of cisplatin, with orally active Pt(IV) drugs which are presently in clinical studies, and with attempts to modify combinatorial chemistry in such a way that it may become applicable to fast screening of Pt antitumor drugs. The potential of including computational methods in solving questions of Pt-DNA interactions is critically dealt with in the concluding chapter.

Author: Janina Baranowska-Kortylewicz
Publisher:
ISBN:
Category :
Languages : en
Pages : 806

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Author: Stephen B. Howell
Publisher: Springer Science & Business Media
ISBN: 030644027X
Category : Medical
Languages : en
Pages : 563

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Taken together the data presented in this review, and work by many other investigators, support the notion that DNA excision repair is important in a tumor cell's resistance to platinum compounds. Inhibition of this repair system by combination chemotherapy with the excision repair inhibitors HU and Ara-C produces synergistic cell kills and increased levels and persistance of DNA interstrand crosslinks. The studies with cis-DDP and ~-DDP in combination with UV induced thymine dimers suggest that there may be competition for DNA repair enzymes between the dimer and the platinum lesion. Whether the competing lesion is an intrastrand crosslink, interstrand crosslink, or platinum monoadduct (or all of these lesions) cannot be determined. The similarity between an intrastrand crosslink and a cyclobutane dimer suggests that these lesions may compete for repair. However, the increased peak levels of interstrand crosslinks, and increased persistence of these lesions at later time points suggest that this lesion may also be a substrate for the repair system. These observations may be of clinical relevance. Recently Dr. Kathy Albain of our institution has completed a Phase III I study using a 12 hour pretreatment with HU and Ara-C in patients prior to their cis-DDP therapy. She observed a significant number of responders in this trial (54). She is currently completing a second Phase IIII study substituting IV HU for the oral formulation. We anticipate initiating other clinical trials based upon these observations.

Author: Nick Hadjiliadis
Publisher: John Wiley & Sons
ISBN: 9781405194105
Category : Science
Languages : en
Pages : 544

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Metal ions and metal complexes have long been recognized ascritically important components of nucleic acid chemistry, both inregulation of gene expression and as promising therapeutic agents.Understanding how metal complexes interact with DNA has become anactive research area at the interface between chemistry, molecularbiology and medicine. Metal Complex - DNA Interactions provides a comprehensiveoverview of this increasingly diverse field, presenting recentdevelopments and the latest research with particular emphasis onmetal-based drugs and metal ion toxicity. The text is divided intofour parts: Basic Structural and Kinetic Aspects: includes chapterson sequence-selective metal binding to DNA and thermodynamicmodels. Medical Applications: focuses on anticancer platinumdrugs, including discussions on DNA repair in antitumor effects ofplatinum drugs and photo-dynamic therapy. DNA-Recognition - Nucleases and Sensor: describesprobes for DNA recognition, artificial restriction agents,metallo-DNAzymes for metal sensing applications and metal iondependent catalysis in nucleic acid enzymes. Toxicological Aspects: deals with structural studies ofmercury–DNA interactions, chromium-induced DNA damage andrepair, and the effect of arsenic and nickel on DNAintegrity. This book will be a valuable resource for academic researchersand professionals from a range of pharmaceutical and chemicalindustries, particularly those involved in the development of newand less toxic anticancer metallo-drugs, and in the field ofenvironmental and toxicological chemistry.

Author: Carmen Avendaño
Publisher: Elsevier
ISBN: 0444626670
Category : Science
Languages : en
Pages : 767

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Medicinal Chemistry of Anticancer Drugs, Second Edition, provides an updated treatment from the point of view of medicinal chemistry and drug design, focusing on the mechanism of action of antitumor drugs from the molecular level, and on the relationship between chemical structure and chemical and biochemical reactivity of antitumor agents. Antitumor chemotherapy is a very active field of research, and a huge amount of information on the topic is generated every year. Cytotoxic chemotherapy is gradually being supplemented by a new generation of drugs that recognize specific targets on the surface or inside cancer cells, and resistance to antitumor drugs continues to be investigated. While these therapies are in their infancy, they hold promise of more effective therapies with fewer side effects. Although many books are available that deal with clinical aspects of cancer chemotherapy, this book provides a sorely needed update from the point of view of medicinal chemistry and drug design. Presents information in a clear and concise way using a large number of figures Historical background provides insights on how the process of drug discovery in the anticancer field has evolved Extensive references to primary literature

Author: Yuen-Ting Shum
Publisher: Open Dissertation Press
ISBN: 9781361428115
Category :
Languages : en
Pages :

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This dissertation, "Functionalized Platinum (II) and Gold (I) Acetylide Complexes: Structural and Spectroscopic Properties and Anticancer Activities" by Yuen-ting, Shum, 岑婉婷, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Abstract of thesis entitled FUNCTIONALIZED PLATINUM(II) AND GOLD(I) ACETYLIDE COMPLEXES. STRUCTURAL AND SPECTROSCOPIC PROPERTIES AND ANTICANCER ACTIVITIES Submitted by SHUM YUEN TING For the degree of Doctor of Philosophy at The University of Hong Kong in April 2007 Planar [Pt(terpy)X] complexes (terpy = 2,2':6',2''-terpyridine; X = Cl, SR) have frequently been cited as classic DNA metallointercalators in bioinorganic chemistry; + however, application studies of [Pt(terpy)L] (L = monoanionic ligand) and its derivatives in metal-based therapeutics are limited. In this work, a series of platinum(II) terpyridine complexes containing different glycosylated acetylide and arylacetylide ligands were prepared and characterized, the photophysical properties of which were investigated. A low-energy absorption band at 409-476 nm, which was assignable to a MLCT transition was observed in its electronic absorption spectra. Upon photoexcitation, intense emission bands at 513-733 nm were observed and were believed to originate from the excited states of 3 3 MLCT and LLCT character. Cytotoxic activities of the ''Pt(terpy)(glycosylated arylacetylide)'' system with significant inhibitory effect toward a series of carcinoma cell lines were discovered. [Pt( Bu terpy)(L3)](CF SO ) (L3 = 4-ethynylphenoxy 3 3 3 -2,3,4,6-tetra-O-acetyl-β-D-glucopyranoside) (IC = 0.06-0.1 M) was found to be 50 i260-fold more effective in growth inhibition of the human brain cancer cell line (SF-268) than cisplatin. The binding interactions of selected platinum(II) complexes 4 5 -1 3 to calf-thymus DNA featured binding constants of 10-10 mol dm . Significantly, the spectral data were found to support a specific binding mode at the AT sequences of DNA for selected complexes. The results of cytometry experiments showed that [Pt( Bu terpy)(L3)](CF SO ) 3 3 3 induce 52.4% apoptosis in NCI-H460 cells. Based on microarray and Western blotting analyses, down-regulation of anti-apoptotic proteins, including Bcl-2 and caspase-3, were observed for platinum-treated NCI-H460 cells. When taken together, the [Pt( Bu terpy)(L3)](CF SO)-induced apoptosis in NCI-H460 cells should 3 3 3 normally occur via the mitochondrial pathway. A family of mono- and binuclear Cy P-supported gold(I) complexes which contained various π-conjugated arylacetylide ligands, were prepared and characterized. The lowest-energy singlet transitions were predominately intraligand in nature and exhibited both phenyl and acetylenic (ππ*) character. The organic triplet emissions of arylacetylide groups were thus "illuminated" at ambient conditions by ligation to the [Au(PCy )] fragment. Strong photoluminescence was detected in solid and solution states of the gold(I) complexes under ambient conditions with lifetimes in the microsecond regime. Selected gold(I) complexes were also subjected to cytotoxicity analysis; only [Au(PCy )(C≡CC H )] showed cytotoxicities (IC = 3 10 7 50 4.9-14.5 M) that were comparable to clinical cisplatin. An acetylide ligand that was appended with lomefloxacin moiety was coordinated to ii with gold(I) and platinum(II) complexes to form [CyPAu(lome)] and [Pt( Bu tpy)(lome)] (CF SO ) (lome = modified lomefloxacin), both of which were 3 3 3 structurally characterized. Tw