The major objective of this research is to elucidate the mechanism of action of the antitumor drug cis-diamminedichloroplatinum(II), cis-DDP. Detailed information about how this leading anticancer drug functions will facilitate both clinical protocols for its use in cancer chemotherapy as well as the design of more effective drugs. Several new reagents to modulate and map the platinum binding sites on DNA, its most likely biological target, will be prepared and characterized. These include chelating diamine platinum(II) complexes linked by a polymethylene or polyamine chain to intercalators or to a pendant EDTA-containing side chain. Addition of Fe(II), O2, and dithiothreitol to the latter will cleave the DNA backbone near the platinum binding sites, providing an internal """"""""molecular scissors"""""""" by which the platinum loci on DNA can be mapped through subsequent electrophoresis on DNA sequencing gels. Platinum-DNA binding locations will also be mapped by using existing and proposed new mono- and polyclonal antibodies prepared agaist cis-DDP modified DNAs. To examine the hypothesis that cis-DDP is selectively cytotoxic to cancer cells because of their lesser ability, compared with normal cells, to repair a specific DNA-Pt lesion, such as the intrastrand d(GpG) crosslink, the genome of M13 virus will be modified with cis-DDP at a unique, chemically programmable site and introduced into normal and repair-deficient cells. Both repair of, and mutagenesis directed by, the platinum lesion will be studied. Replication of the cis-DDP modified M13 viral genome will also be investigated in vitro, and in vivo using E. coli cells mutant in their ability to repair and/or replicate DNA. These experiments require the synthesis of oligonucleotides containing bound cis-diammineplatinum(II). Platinated oligonucleotides from 2 to 21 monomer units in length will be synthesized, purified by HPLC chromatography, and structurally characterized in solution by NMR spectroscopic methods. Where possible, X-ray crystal structures of crystalline complexes will be determined. Mammalian cells will be infected with SV40 virus, treated with cis-DDp, and the platinum binding sites on the SV40 minichromosome mapped. Platinum binding at critical control regions, e.g. enhancer sequences, will be correlated with inhibition of viral directed processes. The speciation of cis-DDp in vivo and in buffers constructed to simulate intracellular conditions will be studied chemically by 195Pt NMR spectroscopy. The chemical characterization of cis-diammine- and ethylenediamineplatinum Alpha-pyridone blues and their Pt(III) derivatives will be completed.

Agency
National Institute of Health (NIH)
Institute
National Cancer Institute (NCI)
Type
Research Project (R01)
Project #
5R01CA034992-04
Application #
3172767
Study Section
Metallobiochemistry Study Section (BMT)
Project Start
1983-01-01
Project End
1989-12-31
Budget Start
1986-01-01
Budget End
1986-12-31
Support Year
4
Fiscal Year
1986
Total Cost
Indirect Cost
Name
Massachusetts Institute of Technology
Department
Type
Schools of Arts and Sciences
DUNS #
City
Cambridge
State
MA
Country
United States
Zip Code
02139
Riddell, Imogen A (2018) Cisplatin and Oxaliplatin: Our Current Understanding of Their Actions. Met Ions Life Sci 18:
Lannagan, Tamsin R M; Lee, Young K; Wang, Tongtong et al. (2018) Genetic editing of colonic organoids provides a molecularly distinct and orthotopic preclinical model of serrated carcinogenesis. Gut :
Roper, Jatin; Tammela, Tuomas; Akkad, Adam et al. (2018) Colonoscopy-based colorectal cancer modeling in mice with CRISPR-Cas9 genome editing and organoid transplantation. Nat Protoc 13:217-234
Ling, Xiang; Chen, Xing; Riddell, Imogen A et al. (2018) Glutathione-Scavenging Poly(disulfide amide) Nanoparticles for the Effective Delivery of Pt(IV) Prodrugs and Reversal of Cisplatin Resistance. Nano Lett 18:4618-4625
Zhou, Wen; Almeqdadi, Mohammad; Xifaras, Michael E et al. (2018) The effect of geometric isomerism on the anticancer activity of the monofunctional platinum complex trans-[Pt(NH3)2(phenanthridine)Cl]NO3. Chem Commun (Camb) 54:2788-2791
Hucke, Anna; Park, Ga Young; Bauer, Oliver B et al. (2018) Interaction of the New Monofunctional Anticancer Agent Phenanthriplatin With Transporters for Organic Cations. Front Chem 6:180
Mihaylova, Maria M; Cheng, Chia-Wei; Cao, Amanda Q et al. (2018) Fasting Activates Fatty Acid Oxidation to Enhance Intestinal Stem Cell Function during Homeostasis and Aging. Cell Stem Cell 22:769-778.e4
Vernekar, Amit A; Berger, Gilles; Czapar, Anna E et al. (2018) Speciation of Phenanthriplatin and Its Analogs in the Core of Tobacco Mosaic Virus. J Am Chem Soc 140:4279-4287
Roper, Jatin; Yilmaz, Ömer H (2017) Metabolic Teamwork in the Stem Cell Niche. Cell Metab 25:993-994
Mana, Miyeko D; Kuo, Elaine Yih-Shuen; Yilmaz, Ömer H (2017) Dietary Regulation of Adult Stem Cells. Curr Stem Cell Rep 3:1-8

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