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Uemi M, Ronsein GE, Prado FM, Motta FD, Miyamoto S, Medeiros MHG, Di Mascio P. Cholesterol Hydroperoxides Generate Singlet Molecular Oxygen [O2(1Δg)]: Near-IR Emission,18O-Labeled Hydroperoxides, and Mass Spectrometry. Chem Res Toxicol 2011; 24:887-95. [DOI: 10.1021/tx200079d] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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Ronsein GE, Prado FM, Mansano FV, Oliveira MCB, Medeiros MHG, Miyamoto S, Di Mascio P. Detection and Characterization of Cholesterol-Oxidized Products Using HPLC Coupled to Dopant Assisted Atmospheric Pressure Photoionization Tandem Mass Spectrometry. Anal Chem 2010; 82:7293-301. [DOI: 10.1021/ac1011987] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Graziella E. Ronsein
- Departamento de Bioquímica, Instituto de Química, Universidade de São Paulo, CP26077, CEP 05513-970, São Paulo, SP, Brazil, and Brazilian Federal Police, Ministry of Justice, Ribeirão Preto Division, CEP 14095-978, Ribeirão Preto, Brazil
| | - Fernanda M. Prado
- Departamento de Bioquímica, Instituto de Química, Universidade de São Paulo, CP26077, CEP 05513-970, São Paulo, SP, Brazil, and Brazilian Federal Police, Ministry of Justice, Ribeirão Preto Division, CEP 14095-978, Ribeirão Preto, Brazil
| | - Fernando V. Mansano
- Departamento de Bioquímica, Instituto de Química, Universidade de São Paulo, CP26077, CEP 05513-970, São Paulo, SP, Brazil, and Brazilian Federal Police, Ministry of Justice, Ribeirão Preto Division, CEP 14095-978, Ribeirão Preto, Brazil
| | - Mauricio C. B. Oliveira
- Departamento de Bioquímica, Instituto de Química, Universidade de São Paulo, CP26077, CEP 05513-970, São Paulo, SP, Brazil, and Brazilian Federal Police, Ministry of Justice, Ribeirão Preto Division, CEP 14095-978, Ribeirão Preto, Brazil
| | - Marisa H. G. Medeiros
- Departamento de Bioquímica, Instituto de Química, Universidade de São Paulo, CP26077, CEP 05513-970, São Paulo, SP, Brazil, and Brazilian Federal Police, Ministry of Justice, Ribeirão Preto Division, CEP 14095-978, Ribeirão Preto, Brazil
| | - Sayuri Miyamoto
- Departamento de Bioquímica, Instituto de Química, Universidade de São Paulo, CP26077, CEP 05513-970, São Paulo, SP, Brazil, and Brazilian Federal Police, Ministry of Justice, Ribeirão Preto Division, CEP 14095-978, Ribeirão Preto, Brazil
| | - Paolo Di Mascio
- Departamento de Bioquímica, Instituto de Química, Universidade de São Paulo, CP26077, CEP 05513-970, São Paulo, SP, Brazil, and Brazilian Federal Police, Ministry of Justice, Ribeirão Preto Division, CEP 14095-978, Ribeirão Preto, Brazil
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Wentworth AD, Song BD, Nieva J, Shafton A, Tripurenani S, Wentworth P. The ratio of cholesterol 5,6-secosterols formed from ozone and singlet oxygen offers insight into the oxidation of cholesterol in vivo. Chem Commun (Camb) 2009:3098-100. [PMID: 19462099 DOI: 10.1039/b821584g] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Ongoing efforts to unravel the origins of the cholesterol 5,6-secosterols (1a and 1b) in biological systems have revealed that the two known chemical routes to these oxysterols, ozonolysis of cholesterol (3) and Hock-cleavage of 5-alpha-hydroperoxycholesterol (4a), are distinguishable based upon the ratio of the hydrazone derivatives (2a and 2b) formed in each case and this ratio offers an insight into the chemical origin of the secosterols in vivo.
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Affiliation(s)
- Anita D Wentworth
- Department of Chemistry and the Skaggs Institute for Chemical Biology, The Scripps Research Institute, La Jolla, CA 92037, USA
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Uemi M, Ronsein GE, Miyamoto S, Medeiros MHG, Di Mascio P. Generation of Cholesterol Carboxyaldehyde by the Reaction of Singlet Molecular Oxygen [O2 (1Δg)] as Well as Ozone with Cholesterol. Chem Res Toxicol 2009; 22:875-84. [DOI: 10.1021/tx800447b] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Miriam Uemi
- Departamento de Bioquímica, Instituto de Química, Universidade de São Paulo, CP26077, CEP 05513-970, São Paulo, SP, Brazil
| | - Graziella E. Ronsein
- Departamento de Bioquímica, Instituto de Química, Universidade de São Paulo, CP26077, CEP 05513-970, São Paulo, SP, Brazil
| | - Sayuri Miyamoto
- Departamento de Bioquímica, Instituto de Química, Universidade de São Paulo, CP26077, CEP 05513-970, São Paulo, SP, Brazil
| | - Marisa H. G. Medeiros
- Departamento de Bioquímica, Instituto de Química, Universidade de São Paulo, CP26077, CEP 05513-970, São Paulo, SP, Brazil
| | - Paolo Di Mascio
- Departamento de Bioquímica, Instituto de Química, Universidade de São Paulo, CP26077, CEP 05513-970, São Paulo, SP, Brazil
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Nelson TJ, Alkon DL. Oxidation of cholesterol by amyloid precursor protein and beta-amyloid peptide. J Biol Chem 2004; 280:7377-87. [PMID: 15591071 DOI: 10.1074/jbc.m409071200] [Citation(s) in RCA: 138] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Alzheimer's disease (AD) is characterized by accumulation of the neurotoxic peptide beta-amyloid, which is produced by proteolysis of amyloid precursor protein (APP). APP is a large membrane-bound copper-binding protein that is essential in maintaining synaptic function and may play a role in synaptogenesis. beta-Amyloid has been shown to contribute to the oxidative stress that accompanies AD. Later stages of AD are characterized by neuronal apoptosis. However, the biochemical function of APP and the mechanism of the toxicity of beta-amyloid are still unclear. In this study, we show that both beta-amyloid and APP can oxidize cholesterol to form 7beta-hydroxycholesterol, a proapoptotic oxysterol that was neurotoxic at nanomolar concentrations. 7beta-Hydroxycholesterol inhibited secretion of soluble APP from cultured rat hippocampal H19-7/IGF-IR neuronal cells and inhibited tumor necrosis factor-alpha-converting enzyme alpha-secretase activity but had no effect on beta-site APP-cleaving enzyme 1 activity. 7beta-Hydroxycholesterol was also a potent inhibitor of alpha-protein kinase C, with a K(i) of approximately 0.2 nm. The rate of reaction between cholesterol and beta-amyloid was comparable to the rates of cholesterol-metabolizing enzymes (k(cat) = 0.211 min(-)1). The rate of production of 7beta-hydroxycholesterol by APP was approximately 200 times lower than by beta-amyloid. Oxidation of cholesterol was accompanied by stoichiometric production of hydrogen peroxide and required divalent copper. The results suggest that a function of APP may be to produce low levels of 7-hydroxycholesterol. Higher levels produced by beta-amyloid could contribute to the oxidative stress and cell loss observed in Alzheimer's disease.
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Affiliation(s)
- Thomas J Nelson
- Blanchette Rockefeller Neurosciences Institute, Rockville, Maryland 20850, USA.
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Bhattacharya PK, Barton JK. Influence of intervening mismatches on long-range guanine oxidation in DNA duplexes. J Am Chem Soc 2001; 123:8649-56. [PMID: 11535068 DOI: 10.1021/ja010996t] [Citation(s) in RCA: 119] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A systematic investigation of the efficiency of oxidative damage at guanine residues through long-range charge transport was carried out as a function of intervening base mismatches. A series of DNA oligonucleotides were synthesized that incorporate a ruthenium intercalator linked covalently to the 5' terminus of one strand and containing two 5'-GG-3' sites in the complementary strand. Single base mismatches were introduced between the two guanine doublet steps, and the efficiency of transport through the mismatches was determined through measurements of the ratio of oxidative damage at the guanine doublets distal versus proximal to the intercalated ruthenium oxidant. Differing relative extents of guanine oxidation were observed for the different mismatches. The damage ratio of oxidation at the distal versus proximal site for the duplexes containing different mismatches varies in the order GC approximately GG approximately GT approximately GA > AA > CC approximately TT approximately CA approximately CT. For all assemblies, damage found with the Delta-Ru diastereomer was found to be greater than with the Lambda-diastereomer. The extent of distal/proximal guanine oxidation in different mismatch-containing duplexes was compared with the helical stability of the duplexes, electrochemical data for intercalator reduction on different mismatch-containing DNA films, and base-pair lifetimes for oligomers containing the different mismatches derived from 1H NMR measurements of the imino proton exchange rates. While a clear correlation is evident both with helix stability and electrochemical data monitoring reduction of an intercalator through DNA films, damage ratios correlate most closely with base-pair lifetimes. Competitive hole trapping at the mismatch site does not appear to be a key factor governing the efficiency of transport through the mismatch. These results underscore the importance of base dynamics in modulating long-range charge transport through the DNA base-pair stack.
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Affiliation(s)
- P K Bhattacharya
- Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, USA
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