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Tang R, Zhang P, Li H, Liu Y, Wang W. Photosensitized xanthone-based oxidation of guanine and its repair: a laser flash photolysis study. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY. B, BIOLOGY 2011; 105:157-61. [PMID: 21908198 DOI: 10.1016/j.jphotobiol.2011.08.005] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/03/2011] [Revised: 08/05/2011] [Accepted: 08/11/2011] [Indexed: 01/22/2023]
Abstract
The photosensitized oxidation of guanine (G) by the triplet state of xanthone (XT) and the repair for photo-damaged G(-H)(·) by ferulic acid (FCA) were investigated using the laser flash photolysis technique. The rate constants of the reaction of triplet state of XT with G and with FCA were determined as 4.5×10(9) and 8.0×10(9) L mol(-1) s(-1), respectively. Laser exposure was performed on the N(2)-saturated acetonitrile/water (v/v, 1:1) solution containing G, XT and FCA. The transient absorption spectra indicated that the triplet state of XT first reacted with G predominantly to form the oxidized radical G(-H)(·). The radical G(-H)(·) was rapidly repaired by FCA, and the rate constant for the repair reaction was determined as 1.1×10(9) L mol(-1) s(-1). These results demonstrated that non-enzymatic repair is a feasible method for repairing photosensitized DNA bases oxidation.
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Affiliation(s)
- Ruizhi Tang
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
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2
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Zheng R, Jia Z, Li J, Huang S, Mu P, Zhang F, Wang C, Yuan C. Fast repair of DNA radicals in the earliest stage of carcinogenesis suppresses hallmarks of cancer. RSC Adv 2011. [DOI: 10.1039/c1ra00523e] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
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Abstract
This tutorial review highlights the mechanism of a novel non-enzymatic fast repair of DNA damage, which refers exclusively to repair DNA radicals including DNA-OH* adducts, DNA radical cations and anions by various endogenous, natural and synthetic compounds. The repair rate constants are as high as 10(9) M(-1) s(-1). In cells, when the enzymatic repair system was inhibited or before the enzymatic repair mechanism was initiated, DNA oxidative damage was significantly reduced by natural polyphenols. This decrease of DNA damage is assigned to the fast repair. Fast repair takes place through an electron transfer process, and docking of polyphenol into the DNA minor groove could be the essential step.
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Affiliation(s)
- Rongliang Zheng
- School of Life Sciences, Lanzhou University, Lanzhou, 730000, China.
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Tan X, Zhao C, Pan J, Shi Y, Liu G, Zhou B, Zheng R. In vivo non-enzymatic repair of DNA oxidative damage by polyphenols. Cell Biol Int 2009; 33:690-6. [PMID: 19375512 DOI: 10.1016/j.cellbi.2009.03.005] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2008] [Revised: 01/27/2009] [Accepted: 03/20/2009] [Indexed: 11/18/2022]
Abstract
The non-enzymatic repair of DNA oxidative damage can occur in a purely chemical system, but data show that it might also occur in cells. Human hepatoma cells (SMMC-7721) and human hepatocyte cells (LO2) were treated with 200microM H(2)O(2) for 30min to induce oxidative DNA damage quantified by amount of 8-OHdG and degree of DNA strand breaks, without inducing enzymatic repair. The dynamics of enzymatic repair activity quantified by unscheduled DNA synthesis, within 30min after removal of H(2)O(2) enzymatic repair mechanism has not been initiated. However, pre-incubation with low micromolar level polyphenols, quercetin or rutin can significantly attenuate DNA damage in both cell lines, indicating that the polyphenols did not work through an enzymatic mechanism. Unscheduled DNA synthesis after removal of H(2)O(2) was also markedly decreased by quercetin and rutin. Combined with our previous studies of fast reaction chemistry, the inhibitory effect of polyphenols have to be assigned to non-enzymatic repair mechanism rather than to enzymatic repair mechanism or antioxidant mechanism.
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Affiliation(s)
- Xiaorong Tan
- School of Bioengineering, Henan University of Technology, Zhengzhou, People's Republic of China
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Li G, Sichula V, Glusac KD. Role of adenine in thymine-dimer repair by reduced flavin-adenine dinucleotide. J Phys Chem B 2008; 112:10758-64. [PMID: 18681479 DOI: 10.1021/jp804506t] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We present a study of excited-state behavior of reduced flavin cofactors using femtosecond optical transient absorption spectroscopy. The reduced flavin cofactors studied were in two protonation states: flavin-adenine dinucleotide (FADH2 and FADH-) and flavin-mononucleotide (FMNH2 and FMNH-). We find that FMNH- exhibits multiexponential decay dynamics due to the presence of two bent conformers of the isoalloxazine ring. FMNH2 exhibits an additional fast deactivation component that is assigned to an iminol tautomer. Reduced flavin cofactors also exhibit a long-lived component that is attributed to the semiquinone and the hydrated electron that are produced in photoinduced electron transfer to the solvent. The presence of adenine in FADH2 and FADH- further changes the excited-state dynamics due to intramolecular electron transfer from the isoalloxazine to the adenine moiety of cofactors. This electron transfer is more pronounced in FADH2 due to pi-stacking interactions between two moieties. We further studied cyclobutane thymine dimer (TT-dimer) repair via FADH- and FMNH- and found that the repair is much more efficient in the case of FADH-. These results suggest that the adenine moiety plays a significant role in the TT-dimer repair dynamics. Two possible explanations for the adenine mediation are presented: (i) a two-step electron transfer process, with the initial electron transfer occurring from flavin to adenine moiety of FADH-, followed by a second electron transfer from adenine to TT-dimer; (ii) the preconcentration of TT-dimer molecules around the flavin cofactor due to the hydrophobic nature of the adenine moiety.
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Affiliation(s)
- Guifeng Li
- Department of Chemistry and Center for Photochemical Sciences, Bowling Green State University, Bowling Green, OH 43403, USA
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Photoreactions of 1,4-naphthoquinone with lysozyme studied by laser flash photolysis and steady-state analysis. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2008; 92:77-82. [DOI: 10.1016/j.jphotobiol.2008.05.002] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/23/2007] [Revised: 05/05/2008] [Accepted: 05/05/2008] [Indexed: 11/17/2022]
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Li YY, Lu JH, Li Q, Zhao YY, Pu XP. Pedicularioside A from Buddleia lindleyana inhibits cell death induced by 1-methyl-4-phenylpyridinium ions (MPP+) in primary cultures of rat mesencephalic neurons. Eur J Pharmacol 2007; 579:134-40. [PMID: 18035349 DOI: 10.1016/j.ejphar.2007.10.052] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2007] [Revised: 10/10/2007] [Accepted: 10/16/2007] [Indexed: 11/18/2022]
Abstract
Parkinson's disease is characterized by the progressive degeneration of midbrain dopaminergic neurons. Buddleia lindleyana is a traditional Chinese herb, commonly called Zui Yu Cao. The purification and identification of pedicularioside A and other phenylethanoid glycosides from this plant have been reported. However, their neuroprotective effects on the 1-methyl-4-phenylpyridinium ion (MPP(+))-induced death of rat mesencephalic neuron primary cultures and the precise mechanism of this protection remains unclear. We used the 3-(4, 5-dimethylthiozol-2-yl)-2, 5-diphenyltetrazolium bromide (MTT) assay for cellular growth to examine the effects of five phenylethanoid glycosides isolated from B. lindleyana, including pedicularioside A, leucosceptoside A, isoacteoside, acteoside, and arenariside, on the viability of mesencephalic neurons treated with MPP(+). Of the compounds tested, pedicularioside A exhibited the greatest degree of protection from MPP(+)-induced cell death. We also observed a marked increase in the number of tyrosine hydroxylase immunoreactive neurons. Pedicularioside A inhibited expression of the caspase-3 gene and cleavage of poly (ADP-ribose) polymerase (PARP) in cultures exposed to MPP(+). Our results suggest that pedicularioside A has a neuroprotective effect to improve the survival of mesencephalic neurons (dopaminergic neurons and non-dopaminergic neurons). The mode of action appears to be the inhibition of caspase-3 gene expression, thereby protecting mesencephalic neurons from MPP(+)-induced cell death.
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Affiliation(s)
- Yan-Yun Li
- Department of Molecular and Cellular Pharmacology, School of Pharmaceutical Science, Peking University, 38 Xueyuan Road, Haidian District, Beijing, 100083, PR China
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Di D, Chen J, Shi Y. Determination of Phenylpropanoid Glycosides in Chinese Herbal Extracts from Pedicularis Species by HPLC. J LIQ CHROMATOGR R T 2007. [DOI: 10.1081/jlc-200025722] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Affiliation(s)
- Duo‐Long Di
- a State Key Laboratory for Natural Medicine of Gansu Province , Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences , Lanzhou , 730000 , P.R. China
| | - Juan Chen
- a State Key Laboratory for Natural Medicine of Gansu Province , Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences , Lanzhou , 730000 , P.R. China
| | - Yan‐Ping Shi
- a State Key Laboratory for Natural Medicine of Gansu Province , Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences , Lanzhou , 730000 , P.R. China
- b State Key Laboratory of Applied Organic Chemistry , Lanzhou University , Lanzhou , P.R. China
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Pharmacological Activities of Phenylpropanoids Glycosides. ACTA ACUST UNITED AC 2006. [DOI: 10.1016/s1572-5995(06)80037-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/16/2023]
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Zhao C, Dodin G, Yuan C, Chen H, Zheng R, Jia Z, Fan BT. “In vitro” protection of DNA from Fenton reaction by plant polyphenol verbascoside. Biochim Biophys Acta Gen Subj 2005; 1723:114-23. [PMID: 15780971 DOI: 10.1016/j.bbagen.2005.02.004] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2004] [Revised: 02/09/2005] [Accepted: 02/09/2005] [Indexed: 12/01/2022]
Abstract
The protection effect of verbascoside (Ver) against Fenton reaction on plasmid pBR322 DNA was studied using agarose gel electrophoresis and UV-visible spectroscopy. The pBR322 plasmid DNA is damaged by hydroxyl radical (OH*) generated from the Fenton reaction with H2O2 and Fe(II) or Fe(III). This DNA damage is characterized by the diminution of supercoiled DNA forms or by the increase of relaxed or linear DNA forms after oxidative attack. The UV spectrum study showed that verbascoside can form complexes with Fe(II) or Fe(III), and the complexation can be reversed by the addition of EDTA. The formation constants of verbascoside-Fe complexes were estimated as 10(21.03) and 10(31.94) M(-2) for Fe(II) and Fe(III) respectively. The inhibition of Fenton reaction by verbascoside could be partially explained by the sequestration of Fe ions.
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Affiliation(s)
- Chenyang Zhao
- ITODYS-CNRS UMR 7086, University Paris 7-Denis Diderot, 1, rue Guy de la Brosse, 75005 Paris, France
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Gao K, Fan B, El?Fassi N, Zakrzewska K, Jia Z, Zheng R, Panaye A, Couesnon T, Doucet JP. Comparative Study of Activities between Verbascoside and Rutin by Docking Method. ACTA ACUST UNITED AC 2003. [DOI: 10.1002/qsar.200390002] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Delalande O, Gao K, Fan BT, Zakrzewska K, El Fassia N, Jia ZJ, Zheng RL, Panaye A, Doucet JP. Docking study of cistanoside C to telomeric DNA fragment. SAR AND QSAR IN ENVIRONMENTAL RESEARCH 2002; 13:675-688. [PMID: 12570045 DOI: 10.1080/1062936021000043427] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Experiments show that the natural products phenyl propanoid glycosides (PPGs) extracted from the plant Pedicularis spicata are capable of repairing DNA damaged by oxygen radicals. Based on kinetic measurements and experiments on tumor cells, a theoretical study of the interaction between PPG molecule Cistanoside C and telomeric DNA fragment has been carried out. The docking calculations performed using JUMNA software showed that the Cistanoside C could be docked into the minor groove of telomeric DNA and form complexes with the geometry suitable for an electron transfer between guanine radical and the ligand. Such complexes can be formed without major distortions of DNA structure and are further stabilized by the interaction with the saccharide side-groups.
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Affiliation(s)
- O Delalande
- ITODYS, CNRS UMR7086, Université Paris 7, 1, rue Guy de la Brosse, 75005 Paris, France
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