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Martínez JJ, Páez LA, Gutiérrez LF, Pardo Cuervo OH, Rojas HA, Romanelli GP, Portilla J, Castillo J, Becerra D. Obtaining Protoanemonin through Selective Oxidation of D‐Fructose and 5‐(Hydroxymethyl)furfural in a Self‐catalysed Reaction. ASIAN J ORG CHEM 2020. [DOI: 10.1002/ajoc.202000406] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- José J. Martínez
- Escuela de Ciencias Química, Facultad de Ciencias Universidad Pedagógica y Tecnológica de Colombia UPTC Avenida Central del Norte 39–115 150003 Tunja Colombia
| | - Luis A. Páez
- Escuela de Ciencias Química, Facultad de Ciencias Universidad Pedagógica y Tecnológica de Colombia UPTC Avenida Central del Norte 39–115 150003 Tunja Colombia
| | - Luisa F. Gutiérrez
- Escuela de Ciencias Química, Facultad de Ciencias Universidad Pedagógica y Tecnológica de Colombia UPTC Avenida Central del Norte 39–115 150003 Tunja Colombia
| | - Oscar H. Pardo Cuervo
- Escuela de Ciencias Química, Facultad de Ciencias Universidad Pedagógica y Tecnológica de Colombia UPTC Avenida Central del Norte 39–115 150003 Tunja Colombia
| | - Hugo A. Rojas
- Escuela de Ciencias Química, Facultad de Ciencias Universidad Pedagógica y Tecnológica de Colombia UPTC Avenida Central del Norte 39–115 150003 Tunja Colombia
| | - Gustavo P. Romanelli
- Centro de Investigación y Desarrollo en Ciencias Aplicadas “Dr. Jorge J. Ronco” CINDECA, (CONICET-CCT La Plata, CIC, UNLP), Facultad de Ciencias Exactas Universidad Nacional de La Plata Calle 47 No 257 B1900AJK La Plata Argentina
- CISAV. Cátedra de Química Orgánica, Facultad de Ciencias Agrarias y Forestales Universidad Nacional de La Plata Calles 60 y 119 s/n B1904AAN La Plata Argentina
| | - Jaime Portilla
- Bioorganic Compounds Research Group, Department of Chemistry Universidad de los Andes Carrera 1 No. 18 A-10 111711 Bogotá Colombia
| | - Juan‐Carlos Castillo
- Escuela de Ciencias Química, Facultad de Ciencias Universidad Pedagógica y Tecnológica de Colombia UPTC Avenida Central del Norte 39–115 150003 Tunja Colombia
- Bioorganic Compounds Research Group, Department of Chemistry Universidad de los Andes Carrera 1 No. 18 A-10 111711 Bogotá Colombia
| | - Diana Becerra
- Escuela de Ciencias Química, Facultad de Ciencias Universidad Pedagógica y Tecnológica de Colombia UPTC Avenida Central del Norte 39–115 150003 Tunja Colombia
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Griffith C, Dayoub AS, Jaranatne T, Alatrash N, Mohamedi A, Abayan K, Breitbach ZS, Armstrong DW, MacDonnell FM. Cellular and cell-free studies of catalytic DNA cleavage by ruthenium polypyridyl complexes containing redox-active intercalating ligands. Chem Sci 2017; 8:3726-3740. [PMID: 28553531 PMCID: PMC5428021 DOI: 10.1039/c6sc04094b] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2016] [Accepted: 03/08/2017] [Indexed: 01/21/2023] Open
Abstract
The ruthenium(ii) polypyridyl complexes (RPCs), [(phen)2Ru(tatpp)]2+ (32+ ) and [(phen)2Ru(tatpp)Ru(phen)2]4+ (44+ ) are shown to cleave DNA in cell-free studies in the presence of a mild reducing agent, i.e. glutathione (GSH), in a manner that is enhanced upon lowering the [O2]. Reactive oxygen species (ROS) are involved in the cleavage process as hydroxy radical scavengers attenuate the cleavage activity. Cleavage experiments in the presence of superoxide dismutase (SOD) and catalase reveal a central role for H2O2 as the immediate precursor for hydroxy radicals. A mechanism is proposed which explains the inverse [O2] dependence and ROS data and involves redox cycling between three DNA-bound redox isomers of 32+ or 44+ . Cultured non-small cell lung cancer cells (H358) are sensitive to 32+ and 44+ with IC50 values of 13 and 15 μM, respectively, and xenograft H358 tumors in nude mice show substantial (∼80%) regression relative to untreated tumors when the mice are treated with enantiopure versions of 32+ and 44+ (Yadav et al. Mol Cancer Res, 2013, 12, 643). Fluorescence microscopy of H358 cells treated with 15 μM 44+ reveals enhanced intracellular ROS production in as little as 2 h post treatment. Detection of phosphorylated ATM via immunofluorescence within 2 h of treatment with 44+ reveals initiation of the DNA damage repair machinery due to the ROS insult and DNA double strand breaks (DSBs) in the nuclei of H358 cells and is confirmed using the γH2AX assay. The cell data for 32+ is less clear but DNA damage occurs. Notably, cells treated with [Ru(diphenylphen)3]2+ (IC50 1.7 μM) show no extra ROS production and no DNA damage by either the pATM or γH2AX even after 22 h. The enhanced DNA cleavage under low [O2] (4 μM) seen in cell-free cleavage assays of 32+ and 44+ is only partially reflected in the cytotoxicity of 32+ and 44+ in H358, HCC2998, HOP-62 and Hs766t under hypoxia (1.1% O2) relative to normoxia (18% O2). Cells treated with RPC 32+ show up to a two-fold enhancement in the IC50 under hypoxia whereas cells treated with RPC 44+ gave the same IC50 whether under hypoxia or normoxia.
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Affiliation(s)
- Cynthia Griffith
- Department of Chemistry and Biochemistry , University of Texas at Arlington , Arlington , TX 76019 , USA .
| | - Adam S Dayoub
- Department of Chemistry and Biochemistry , University of Texas at Arlington , Arlington , TX 76019 , USA .
| | - Thamara Jaranatne
- Department of Chemistry and Biochemistry , University of Texas at Arlington , Arlington , TX 76019 , USA .
| | - Nagham Alatrash
- Department of Chemistry and Biochemistry , University of Texas at Arlington , Arlington , TX 76019 , USA .
| | - Ali Mohamedi
- Department of Chemistry and Biochemistry , University of Texas at Arlington , Arlington , TX 76019 , USA .
| | - Kenneth Abayan
- Department of Chemistry and Biochemistry , University of Texas at Arlington , Arlington , TX 76019 , USA .
| | - Zachary S Breitbach
- Department of Chemistry and Biochemistry , University of Texas at Arlington , Arlington , TX 76019 , USA .
| | - Daniel W Armstrong
- Department of Chemistry and Biochemistry , University of Texas at Arlington , Arlington , TX 76019 , USA .
| | - Frederick M MacDonnell
- Department of Chemistry and Biochemistry , University of Texas at Arlington , Arlington , TX 76019 , USA .
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Bobadilla Fazzini RA, Skindersoe ME, Bielecki P, Puchałka J, Givskov M, Martins sos Santos VAP. Protoanemonin: a natural quorum sensing inhibitor that selectively activates iron starvation response. Environ Microbiol 2012; 15:111-20. [PMID: 22672701 DOI: 10.1111/j.1462-2920.2012.02792.x] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Many Gram-negative bacteria employ cell-to-cell communication mediated by N-acyl homoserine lactones (quorum sensing) to control expression of a wide range of genes including, but not limited to, genes encoding virulence factors. Outside the laboratory, the bacteria live in complex communities where signals may be perceived across species. We here present a newly found natural quorum sensing inhibitor, produced by the pseudomonads Pseudomonas sp. B13 and Pseudomonas reinekei MT1 as a blind end in the biodegradation of organochloride xenobiotics, which inhibits quorum sensing in P. aeruginosa in naturally occurring concentrations. This catabolite, 4-methylenebut-2-en-4-olide, also known as protoanemonin, has been reported to possess antibacterial properties, but seems to have dual functions. Using transcriptomics and proteomics, we found that protoanemonin significantly reduced expression of genes and secretion of proteins known to be under control of quorum sensing in P. aeruginosa. Moreover, we found activation of genes and gene products involved in iron starvation response. It is thus likely that inhibition of quorum sensing, as the production of antibiotics, is a phenomenon found in complex bacterial communities.
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Affiliation(s)
- Peter C. Dedon
- Department of Biological Engineering and Center for Environmental Health Sciences, Massachusetts Institute of Technology, NE47-277, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139
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