期刊文献+
共找到16篇文章
< 1 >
每页显示 20 50 100
Effects of Explicit and Implicit Solvent Models on the Hydrolysis Cleavage of N-Glycosidic Bond in 8-Oxo-7,8-dihydro-2'-deoxyguanosine
1
作者 陈泽琴 何云清 +1 位作者 郭林峰 薛英 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 2014年第4期505-512,共8页
8-Oxoguanine (8-oxoG), a critical mutagenic DNA lesion induced by reactive oxy- gen species, gives rise to a G·C→T·A transversion during replication and thereby must be repaired. The effects of explicit a... 8-Oxoguanine (8-oxoG), a critical mutagenic DNA lesion induced by reactive oxy- gen species, gives rise to a G·C→T·A transversion during replication and thereby must be repaired. The effects of explicit and implicit solvent molecules on the hydrolysis cleavage of N-Glycosidic bond in 8-oxo-7,8-dihydro-2'-deoxyguanosine (8-oxo-dG) have been systematically clarified in the present work based upon two types of computational models. Detailed potential energy surface (PES) scans and full unconstraint optimizations for all the representative points on PESs were carried out at the B3LYP/6-31+G(d) level of theory. The effect of implicit solvent was tested by single-point calculation at the SCRF/IEF-PCM model. The results illustrate that the direct hydrolysis model involving one explicit water molecule can’t provide a complete depiction of the hydrolysis process of 8-oxo-dG, attributed to the insufficiency of nucleophile activation and leaving group stabilization. The expansion hydrolysis model involving four explicit water molecules, however, facilitates discrete proton transfer and therefore produces smooth reaction surfaces for both the dissociative (SN1) and concerted (SN2) pathways. The presence of the implicit solvent substantially lowers all activation energies and the SN1 process is more favorable than the SN2 process. The data and insights present here agree well with the experimental results and have given out a baseline for the enzymatic deglycosylation reaction of 8-oxo-dG. 展开更多
关键词 8-oxo-7 8-dihydro-2'-deoxyguanosine hydrolysis mechanism
下载PDF
Determination of urinary 8-hydroxy-2′-deoxyguanosine by capillary electrophoresis with molecularly imprinted monolith in-tube solid phase microextraction 被引量:6
2
作者 Zhang, Shao Wen Zou, Cun Jie +4 位作者 Luo, Nan Weng, Qian Feng Cai, Ling Shuang Wu, Cai Ying Xing, Jun 《Chinese Chemical Letters》 SCIE CAS CSCD 2010年第1期85-88,共4页
Urinary 8-hydroxy-2 -deoxyguanosine(8-OHdG) is an excellent marker of oxidative DNA damage.In this study,employing guanosine as dummy template a novel molecularly imprinted(MIP) monolithic capillary column had been sy... Urinary 8-hydroxy-2 -deoxyguanosine(8-OHdG) is an excellent marker of oxidative DNA damage.In this study,employing guanosine as dummy template a novel molecularly imprinted(MIP) monolithic capillary column had been synthesized,and that was used as medium of in-tube solid phase microextraction(SPME).Coupled with capillary electrophoresis-electrochemical detection(CE-ECD),the system of extraction and detection of 8-OHdG in urinary sample had been developed.Because of its greater phase ratio combined with conv... 展开更多
关键词 Molecularly imprinted monolith In-tube solid phase microextraction 8-Hydroxy-2 -deoxyguanosine8-OHdG) Electrophoresis Urine
下载PDF
Expression of 8-hydroxy-2'-deoxyguanosine in gastric carcinomas 被引量:1
3
作者 Xiaoyu Chen Jun Du LUO Gu 《Journal of Nanjing Medical University》 2007年第1期11-14,共4页
Reactive oxygen species may be involved in the progression of gastric carcinomas. To clarify whether the pathology of gastric carcinoma are related to oxidative DNA damage, the expression of 8-hydroxy-2'-deoxyguanosi... Reactive oxygen species may be involved in the progression of gastric carcinomas. To clarify whether the pathology of gastric carcinoma are related to oxidative DNA damage, the expression of 8-hydroxy-2'-deoxyguanosine (8-OHdG) was examined in 30 patients with gastric carcinomas. Methods: The expression of 8-OHdG and apoptosis in the gastric carcinoma were measured using the methods of immunocytochemistry and deoxynucleartididyl transferase-mediated dUTP-biotin nick end labeling (TUNEL), respectively. Results: Of the 30 cases, 25(83%) showed stronger immunoreactivity than normal control. The patients with poorly differentiated gastric carcinoma had a larger tumor size and higher labeling indices of TUNEL- and 8-OHdG-positive cells than those with well and moderately differentiated gastric carcinoma. Conclusion: Our findings suggest that oxidative DNA damage is increased in association with necroinflammation in chronic gastric injuries and determination of 8-OHdG is useful in assessing high-grade malignancy in gastric carcinomas. 展开更多
关键词 8-hydroxy-2'-deoxyguanosine 8-OHdG) DNA damage Reactive oxygen species (ROS) carcinoma apoptosis STOMACH
下载PDF
Studies on the esterifications of 9-(hydroxyimino)-4-methyl-8,9-dihydrofuro[2,3-h]chromen-2-one with acid chlorides under different conditions
4
作者 Ru Shu Sun Yang Wang Peng Xia 《Chinese Chemical Letters》 SCIE CAS CSCD 2008年第7期791-794,共4页
The esterifications of 9-(hydroxyimino)-4-methyl-8,9-dihydrofuro[2,3-h]chromen-2-one (4) with acid chlorides afforded normal oxime-esters 3a-e in 35-78% yields in presence of excessive 4-dimethylaminopyridine as t... The esterifications of 9-(hydroxyimino)-4-methyl-8,9-dihydrofuro[2,3-h]chromen-2-one (4) with acid chlorides afforded normal oxime-esters 3a-e in 35-78% yields in presence of excessive 4-dimethylaminopyridine as the acid scavenger, whereas the reactions gave unexpected 8-substituted products N-(8-chloro-4-methyl-2-oxo-2H-furo-[2,3-h]chromen-9-yl)amides (5a-c) and 4-methyl-2,9-dioxo-8,9-dihydro-2H-furo[2,3-h]chromen-8-ylcarboxyloates (6d-e) by using excessive acid chlorides. The structures of 10 new compounds were determined by 1H NMR, 13C NMR, MS and HRMS, and the possible mechanism for the formation of unexpected products 5a--c and 6d-e was also proposed. 展开更多
关键词 9-(Hydroxyirnino)-4-methyl-8 9-dihydrofuro[2 3-h]chromen-2-one Oxime-ester N-(8-Chloro-4-methyl-2-oxo-2H-furo[2 3-h]chro-men-9-yl)amide 4-Methyl-2 9-dioxo-8 9-dihydro-2H-furo[2 3-h]chromen-8-ylcarboxyloate
下载PDF
Elevated 8-oxo-7,8-dihydro-2'-deoxyguanosine in genome of T24 bladder cancer cells induced by halobenzoquinones 被引量:5
5
作者 Tian Xu Junfa Yin +2 位作者 Shaokun Chen Dapeng Zhang Hailin Wang 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2018年第1期133-139,共7页
Halobenzoquinones(HBQs) are an emerging class of halogenated disinfection byproducts(DBPs) in drinking water, which raised public concerns due to potential carcinogenic effects to human bladder. Our previous work ... Halobenzoquinones(HBQs) are an emerging class of halogenated disinfection byproducts(DBPs) in drinking water, which raised public concerns due to potential carcinogenic effects to human bladder. Our previous work demonstrated that HBQs and hydrogen peroxide(H_2O_2)together generated oxidative DNA damage via a metal-independent and intercalationenhanced oxidation mechanism in vitro. This study further investigated the efficiency of various HBQs to induce oxidative DNA damage in T24 bladder cancer cells. Compared with T24 cells without treatment(3.1 lesions per 10~6 d G), the level of 8-oxo-7,8-dihydro-2′-deoxyguanosine(8-oxod G) significantly increased by 1.4, 3.2, 8.8, and 9.2 times after treatment with tetrabromo-1,4-benzoquinone(TBBQ), terachloro-1,4-benzoquinone(TCBQ),2,6-dichloro-1,4-benzoquinone(2,6-DCBQ) and 2,5-dichloro-1,4-benzoquinone(2,5-DCBQ) for24 hr, respectively. Interestingly, we found that the oxidative potency of HBQs in T24 cells(2,5-DCBQ ≈ 2,6-DCBQ 〉 TCBQ 〉 TBBQ) is inconsistent with that of in vitro ds DNA oxidation(TCBQ 〉 TBBQ 〉 2,5-DCBQ 〉 2,6-DCBQ), suggesting HBQs induce oxidative lesions in cellular genomic DNA probably involved with a complex mechanism. 展开更多
关键词 Halobenzoquinones Reactive oxygen species Oxidative DNA damage 8-oxo-7 8-dihydro-2-deoxyguanosine8-oxodG)
原文传递
Fabrication of the DNA/poly(3-methylthiophene) composite film modified electrode and its application for the study on the voltammetric behavior and determination of 8-hydroxy-2'-deoxyguanosine 被引量:2
6
作者 WANG YanHuai,LI Jing,LIU Yan,MA RongNa,JIA WenLi,CUI Hui & WANG HuaiSheng College of Chemistry and Chemical Engineering,Institute of Analytical Chemistry,Liaocheng University,Liaocheng 252059,China 《Science China Chemistry》 SCIE EI CAS 2009年第11期2006-2012,共7页
A composite film of DNA/poly(3-methylthiophene)(P3MT) modified glassy carbon electrode(GCE) has been fabricated by electro-deposition method.P3MT film was first electropolymerized at the GCE and the DNA layer was then... A composite film of DNA/poly(3-methylthiophene)(P3MT) modified glassy carbon electrode(GCE) has been fabricated by electro-deposition method.P3MT film was first electropolymerized at the GCE and the DNA layer was then immobilized on the P3MT layer by electrochemical method.The voltammetric behavior of 8-hydroxy-2'-deoxyguanosine(8-OH-dG) at the composite film modified electrode was studied.The effects of scan rates,pH and the interference of uric acid(UA) on the voltammetric behavior and detection of 8-OH-dG were also discussed.The experimental results suggest that the electrochemical behavior of 8-OH-dG at the composite film modified electrode was greatly improved due to the combination of the advantages of P3MT and DNA.In 0.1 M pH 7.0 phosphate buffer solution(PBS),the anodic peak currents of 8-OH-dG were linear with the 8-OH-dG concentration in two intervals,viz.0.28―4.2 μM and 4.2―19.6 μM.The detection limit of 56 nM 8-OH-dG could be estimated(S/N=3).This proposed composite film modified electrode shows excellent reproducibility and stability.It may have the potential application for the detection of 8-OH-dG in human urine. 展开更多
关键词 poly(3-methylthiophene) DNA 8-hydroxy-2-deoxyguanosine composite film modified electrode
原文传递
侧茎橐吾化学成分的研究(英文) 被引量:10
7
作者 张勉 张朝凤 王峥涛 《药学学报》 CAS CSCD 北大核心 2005年第6期529-532,共4页
目的 侧茎橐吾(Ligulariapleurocaulis)为菊科橐吾属植物,其根和根茎入药,有止咳化痰、活血化瘀等功效,为中药“紫菀”(中国药典2000年版收载为AstertataricusL.f.的根及根茎)的代用品之一,称为“山紫菀”。有关侧茎橐吾的化学成分研... 目的 侧茎橐吾(Ligulariapleurocaulis)为菊科橐吾属植物,其根和根茎入药,有止咳化痰、活血化瘀等功效,为中药“紫菀”(中国药典2000年版收载为AstertataricusL.f.的根及根茎)的代用品之一,称为“山紫菀”。有关侧茎橐吾的化学成分研究尚未见报道,因此,本文对侧茎橐吾的根及根茎的化学成分进行了研究。方法 侧茎橐吾的根和根茎用甲醇提取,硅胶柱色谱和重结晶等方法进行分离纯化。根据化合物的理化性质和光谱数据进行结构鉴定。结果 分离得到了12个化合物,即6 angeloyloxy furanoligularenone(1), 2- oxo 3 -hydroxy eremophila 1(10), 3, 7(11), 8- tetraen 8, 12 -olide(2),顺芷酸(3),齐墩果酸(4),羽扇豆醇(5),β谷甾醇(6),胡萝卜苷(7),咖啡酸- (8),大黄素(9), 7- 甲氧基香豆素(10),阿魏酸(11)和4 -羟基-2, 5 -二甲氧基苯甲醛(12)。结论 化合物1为新的eremophilane型倍半萜,化合物2为新的天然产物。所有化合物均为首次从本植物中得到。 展开更多
关键词 侧茎橐吾 6-angeloyloxy-furanoligularenone 2-oxo-3-hydroxy-eremophila-1(10) 3 7(11) 8-tetraen-8 12-olide
下载PDF
苏木心材中一个新黄酮类化合物 被引量:2
8
作者 舒诗会 韩景兰 +1 位作者 杜冠华 秦海林 《中国中药杂志》 CAS CSCD 北大核心 2008年第8期903-905,共3页
目的:从苏木Caesalpinia sappan中寻找新的活性成分。方法:用溶剂萃取及硅胶正相色谱进行活性成分的分离纯化,根据理化性质、光谱数据进行结构鉴定。结果:从苏木95%乙醇提取物中分离得到了9个化合物:3,8-dihydroxy-4,10-dimethoxy-7-oxo... 目的:从苏木Caesalpinia sappan中寻找新的活性成分。方法:用溶剂萃取及硅胶正相色谱进行活性成分的分离纯化,根据理化性质、光谱数据进行结构鉴定。结果:从苏木95%乙醇提取物中分离得到了9个化合物:3,8-dihydroxy-4,10-dimethoxy-7-oxo-[2]benzopyrano[4,3-b][1]benzopyran-7-(5H)-one(1),3-deoxysappanchal-cone(2),sappanchalcone(3),3-deoxysappanone B(4),鼠李素(rhamnetin,5),原苏木素C(protosappanin C,6),3,7-di-hydroxy-chroman-4-one(7),己二酸二甲酯(8),胡萝卜苷(daucosterin,9)。结论:化合物1为新化合物,化合物7,8为首次从该植物中分离得到。药理筛选结果表明,化合物3对多种癌细胞株具有一定的抑制活性。 展开更多
关键词 苏木 黄酮 3 8-dihydroxy-4 benzopyrano[4 benzopyran-7-(5H)-one 细胞毒活性
下载PDF
Nitrative and oxidative DNA damage in intrahepatic cholangiocarcinoma patients in relation to tumor invasion 被引量:9
9
作者 Somchai Pinlaor Banchob Sripa +9 位作者 Ning Ma Yusuke Hiraku Puangrat Yongvanit Sopit Wongkham Chawalit Pairojkul Vajarabhongsa Bhudhisawasdi Shinji Oikawa Mariko Murata Reiji Semba Shosuke Kawanishi 《World Journal of Gastroenterology》 SCIE CAS CSCD 2005年第30期4644-4649,共6页
AIM: Nitrative and oxidative DNA damage such as 8-nitroguanine and 8-oxo-7,8-dihydro-2'-deoxyguanosine (8-oxodG) formation has been implicated in initiation and/ or promotion of inflammation-mediated carcinogenesi... AIM: Nitrative and oxidative DNA damage such as 8-nitroguanine and 8-oxo-7,8-dihydro-2'-deoxyguanosine (8-oxodG) formation has been implicated in initiation and/ or promotion of inflammation-mediated carcinogenesis. The aim of this study is to clarify whether these DNA lesions participate in the progression of intrahepatic cholangiocarcinoma. METHODS: We investigated the relation of the formation of 8-nitroguanine and 8-oxodG and the expression of hypoxia-inducible factor-1α (HIF-1α) with tumor invasion in 37 patients with intra-hepatic cholangiocarcinoma. RESULTS: Immunohistochemical analyses revealed that 8-nitroguanine and 8-oxodG formation occurred to a much greater extent in cancerous tissues than in non-cancerous tissues. HIF-1α could be detected in cancerous tissues in all patients, suggesting low oxygen tension in the tumors. HIF-1α expression was correlated with inducible niltric oxide synthase (iNOS) expression (r = 0.369 and P = 0.025) and 8-oxodG formation (r = 0.398 and P = 0.015). Double immunofluorescence study revealed that iNOS and HIF-1α co-localized in cancerous tissues. Notably, the formation of 8-oxodG was correlated significantly with lymphatic invasion (r = 0.386 and P = 0.018). Moreover, 8- nitroguanine and 8-oxodG in non-cancerous tissues were associated significantly with neural invasion (P = 0.042 and P = 0.026, respectively). These results suggest that reciprocal activation between HIF-1α and iNOS mediates persistent DNA damage, which induces tumor invasiveness via mutations, resulting in poor prognosis. CONCLUSION: The formation of 8-nitroguanine and 8-oxodG plays an important role in multiple steps of genetic changes leading to tumor progression, including invasiveness. 展开更多
关键词 8-Nitroguanine 8-oxo-7 8-dihydro-2'-deoxyguanosine Hypoxia-inducible factor-1α CHOLANGIOCARCINOMA Tumor invasion
下载PDF
Puerarin prevents high glucose-induced apoptosis of Schwann cells by inhibiting oxidative stress 被引量:10
10
作者 Yingying Wu Bing Xue +1 位作者 Xiaojin Li Hongchen Liu 《Neural Regeneration Research》 SCIE CAS CSCD 2012年第33期2583-2591,共9页
Oxidative stress may be the unifying factor for the injury caused by hyperglycemia in diabetic peripheral neuropathy. Puerarin is the major isoflavonoid derived from Radix puerariae and has been shown to be effective ... Oxidative stress may be the unifying factor for the injury caused by hyperglycemia in diabetic peripheral neuropathy. Puerarin is the major isoflavonoid derived from Radix puerariae and has been shown to be effective in increasing superoxide dismutase activity. This study sought to investigate the neuroprotective effect of puerarin on high glucose-induced oxidative stress and Schwann cell apoptosis in vitro. Intracellular reactive oxygen radicals and mitochondrial transmembrane potential were detected by flow cytometry analysis. Apoptosis was confirmed by TUNEL and oxidative stress was monitored using an enzyme-linked immunosorbent assay for the DNA marker 8-hydroxy-2-deoxyguanosine. The expression levels of bax and bcl-2 were analyzed by quantitative real-time reverse transcriptase-PCR, while protein expression of cleaved caspase-3 and -9 were analyzed by means of western blotting. Results suggested that puerarin treatment inhibited high glucose-induced oxidative stress, mitochondrial depolarization and apoptosis in a dose-dependent manner. Furthermore, puerarin treatment downregulated Bax expression, upregulated bcl-2 expression and attenuated the activation of caspase-3 and -9. Overall, our results indicated that puerarin antagonized high glucose-induced oxidative stress and apoptosis in Schwann cells. 展开更多
关键词 PUERARIN diabetic peripheral neuropathy hyperglycemia Schwann cell apoptosis caspase mitochondrial transmembrane potential oxidative stress 8-hydroxy-2-deoxyguanosine reactive oxygen radical
下载PDF
Influence of Therapy on Some Important Final Products of Oxidation of Lipids, Proteins and Nucleic Acids in Patients with Parkinson’s Diseases 被引量:2
11
作者 Galina D. Nikolova Boncho G. Grigorov +1 位作者 Antoaneta M. Zheleva Veselina G. Gadjeva 《Advances in Biological Chemistry》 2014年第4期253-260,共8页
The major clinical disturbances in Parkinson’s disease (PD) are consequence of dopamine depletion in the neostriatum, due to degeneration of dopaminergic neurons. The aim of the present study was to determine whether... The major clinical disturbances in Parkinson’s disease (PD) are consequence of dopamine depletion in the neostriatum, due to degeneration of dopaminergic neurons. The aim of the present study was to determine whether oxidative stress (OS) occurs during the clinical course of Parkinson’s disease and to evaluate the influence of therapy on the levels of some important final products of oxidation of lipids, proteins and nucleic acids in PD patients with drug therapy. For this purpose, we investigated the levels of malondialdehid (MDA), protein carbonyl content (PCC) and 8-hydroxy-2’-deoxyguanosine quantity (8-OHdG) in PD patients with and without drug therapy. The observed changes in MDA levels, PCC and 8-OHdG quantity in blood of untreated PD patients, suggested impaired antioxidant status and presence of oxidative stress in Parkinson disease. After treatment with Madopar, the elevation in by-products significantly progresses. Our results demonstrate that administration of Madopar causes in greater degree oxidative stress than that induced by Parkinson disease, by itself. 展开更多
关键词 Free RADICALS MALONDIALDEHYDE 8-Hydroxy-2-deoxyguanosine Protein CARBONYL Content
下载PDF
Fast Evaluation of Oxidative DNA Damage by Liquid Chromatography-Electrospray Tandem Mass Spectrometry Coupled With Precision-cut Rat Liver Slices
12
作者 JIANG YUE PENG WANG +3 位作者 YING-HUI LIU JUN-YU WU JIE CHEN REN-XIU PENG 《Biomedical and Environmental Sciences》 SCIE CAS CSCD 2007年第5期386-391,共6页
Objective To establish a fast and sensitive method for the detection of 8-hydroxy-2’-deoxyguanosine (8-OHdG) in precision-cut rat liver slices by HPLC-MS/MS and to investigate isoniazid (INH) -induced oxidative D... Objective To establish a fast and sensitive method for the detection of 8-hydroxy-2’-deoxyguanosine (8-OHdG) in precision-cut rat liver slices by HPLC-MS/MS and to investigate isoniazid (INH) -induced oxidative DNA damage. Methods Precision-cut liver slices (300 μm) were prepared from male rats, and incubated with INH (0.018 mol/L) for 2 h after 1 h preincubation. DNA in the slices was extracted and digested into free nucleosides at 37℃ . The samples were injected into HPLC-MS/MS after the proteins were removed. The level of oxidative DNA damage was estimated using the ratio of 8-OHdG to deoxyguanosine (dG). Results The limit of detection of 8-OHdG was 1 ng/mL (S/N=3) and the intra-assay relative standard variation was 3.38% when one transition 284.3/168.4 was used as a quantifier and another two transitions 284.3/140.2, 306.1/190.2 as qualifiers. 8-OHdG and dG were well separated, as indicated by elution at 10.02 and 7.37 min, respectively. INH significantly increased the ratio of 8-OHdG to dG in rat liver slices (P〈0.05). Conclusion 8-OHdG in precision-cut liver slices could be sensitively determined by HPLC-MS/MS. HPLC-MS/MS coupled with precision-cut tissue slices is a fast and reliable analytical technique to evaluate oxidative DNA damage of target tissues caused by procarcinogens and cytotoxins. 展开更多
关键词 ISONIAZID 8-Hydroxy-2'-deoxyguanosine HPLC-MS/MS Precision-cut liver slices
下载PDF
Characterization of DNA Intercalator Bound to Calf Thymus DNA:Ionic Strength and pH Value Effects
13
作者 YUAN Chun-li ZHANG Zhi-chao +1 位作者 SONG Ting WU Gui-ye 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 2009年第4期492-496,共5页
By means of circular dichroism(CD) spectrum coupled with UV-Vis and fluorescence spectra,the binding model of DNA intercalator A1{4-(2-diethylamino-ethylamino)-8-oxo-8H-acenaphtho[1,2-b]pyrrole-9-carbonitrile} to ... By means of circular dichroism(CD) spectrum coupled with UV-Vis and fluorescence spectra,the binding model of DNA intercalator A1{4-(2-diethylamino-ethylamino)-8-oxo-8H-acenaphtho[1,2-b]pyrrole-9-carbonitrile} to calf thymus(CT) DNA was investigated,depending on the values of R(R is defined as the ratio of the concentration of A1 to CT DNA base pairs) and different outer factors.Molecules A1 were intercalated into the CT DNA base pairs in different orientations in the intercalation pocket at a lower R value(R≤0.20),while A1 molecules aggregated on the surface of the helix of the CT DNA as the R value increased.The influence of NaCl on the binding was smaller because the electrostatic interaction only provided approximately 16% of the overall free energy of binding.The protonated diethylamine substitution would influence the binding geometry greatly at a low pH value via forming hydrogen bonds with the exposed C=O group on DNA surface. 展开更多
关键词 DNA intercalator 4-(2-Diethylamino-ethylamino)-8-oxo-8H-acenaphtho[1 2-b]pyrrole-9-carbonitrile Ionic strength
下载PDF
Distinct profiles of systemic biomarkers of oxidative stress in chronic human pathologies:Cardiovascular,psychiatric,neurodegenerative,rheumatic,infectious,neoplasmic and endocrinological diseases
14
作者 Michel Brack Olivier Brack +4 位作者 Yves Menezo Dominique Bonnefont Rousselot Gerard Dreyfus MJohn Chapman Anatol Kontush 《Advances in Bioscience and Biotechnology》 2013年第3期331-339,共9页
Oxidative stress is involved in chronic and acute pathologies: cardiovascular, neurodegenerative, neoplastic, inflammatory and infectious diseases. Clinical trials focused on prevention of cardiovascular and neoplasti... Oxidative stress is involved in chronic and acute pathologies: cardiovascular, neurodegenerative, neoplastic, inflammatory and infectious diseases. Clinical trials focused on prevention of cardiovascular and neoplastic diseases involving antioxidant supplementation have however provided predominantly negative obserations in large-scale studies. Screening of patient cohorts to assess baseline oxidative stress on the basis of a biomarker profile is decisive but lacking. For the first time, we evaluated the level of oxidative stress, testing more than 10 established biomarkers, in a comprehensive initial survey of 617 patients displaying chronic human pathologies. Multiple diseasespecific abnormalities were identified in plasma, whole blood and/or urine. This is the case for vitamins and oligo elements, vitamin C, vitamin E, β-carotene, selenium, zinc and copper;endogenous antioxidants such as reduced and oxidised glutathione, thiols, urate, and glutathione peroxidase activity, and a biomarker of oxidative DNA damage (8-hydroxy-2’-deoxy guanosine). The distinct biomarker profiles suggest the involvment of multiple forms of oxidative insults which arein some way partially specific to each pathological condition. This finding is in favor of the determination of an integrated score to combine contributions of distinct biomarkers, in order to screen patients presenting elevated levels of oxidative stress. 展开更多
关键词 Vitamin C Vitamin E Β-CAROTENE Glutathione THIOLS URATE 8-Hydroxy-2-deoxyguanosine
下载PDF
IVlelatonin ameliorates the adverse effects of leptin on sperm 被引量:4
15
作者 Fayez A Almabhouh Khairul Osman +4 位作者 Siti Fatimah Ibrahim Sergey Gupalo Justin Gnanou Effendi Ibrahim Harbindar Jeet Singh 《Asian Journal of Andrology》 SCIE CAS CSCD 2017年第6期647-654,共8页
This study examined the effects of melatonin on leptin-induced changes in sperm parameters in adult rats. Five groups of Sprague-Dawley rats were treated with either leptin or leptin and melatonin or melatonin for 6 w... This study examined the effects of melatonin on leptin-induced changes in sperm parameters in adult rats. Five groups of Sprague-Dawley rats were treated with either leptin or leptin and melatonin or melatonin for 6 weeks. Leptin was given daily via the intraperitoneal route (60 μg kg-1 body weight) and melatonin was given in drinking water (10 mg kg-1 or 20 mg kg-1 body weight per day). Upon completion, sperm count, sperm morphology, 8-hydroxy-2-deoxyguanosine, Comet assay, TUNEL assay, gene expression profiles of antioxidant enzymes, respiratory chain reaction enzymes, DNA damage, and apoptosis genes were estimated. Data were analyzed using ANOVA. Sperm count was significantly lower whereas the fraction of sperm with abnormal morphology, the level of 8-hydroxy-2-deoxyguanosine, and sperm DNA fragmentation were significantly higher in rats treated with leptin only. Micmarray analysis revealed significant upregulation of apoptosis-inducing factor, histone acetyl transferase, respiratory chain reaction enzyme, cell necrosis and DNA repair genes, and downregulation of antioxidant enzyme genes in leptin-treated rats. Real-time polymerase chain reaction showed significant decreases in glutathione peroxidase 1 expression with increases in the expression of apoptosis-inducing factor and histone acetyl transferase in leptin-treated rats. There was no change in the gene expression of caspase-3 (CASP-3). In conclusion, the adverse effects of leptin on sperm can be prevented by concurrent melatonin administration. 展开更多
关键词 8-hydroxy-2-deoxyguanosine DNA fragmentation LEPTIN MELATONIN SPERM
原文传递
Comparative study of the cytotoxicity of the nanosized and microsized tellurium powders on HeLa cells 被引量:1
16
作者 Huanan WEN Jiaxin ZHONG +5 位作者 Bei SHEN Tao GAN Chao FU Zhihong ZHU Rui LI Xu YANG 《Frontiers in Biology》 CAS CSCD 2013年第4期444-450,共7页
To compare the cytotoxicity on HeLa cells induced by nanosized and microsized tellurium powders, HeLa cells were exposed to different concentrations of tellurium powders (0, 50, 100, 150 and 200 μg/mL) for 12 h. In... To compare the cytotoxicity on HeLa cells induced by nanosized and microsized tellurium powders, HeLa cells were exposed to different concentrations of tellurium powders (0, 50, 100, 150 and 200 μg/mL) for 12 h. In this study, detection of a series of biomarkers, including reactive oxygen species (ROS), glutathione (GSH), 8-hydroxy-2'- deoxyguanosine (8-OHdG), in addition to DNA and protein crosslink (DPC) and MTT assay, were conducted to evaluate the cytotoxicity. It is indicated that compared with the control group, there was no significant difference in the induced cytotoxicity at concentrations lower than 50 μg/mL for both nanosized and microsized tellurium powders. While there appears a significant difference in the induced cytotoxicity for nanosized tellurium powders when the concentration is higher than 100 μg/mL as well as for microsized tellurium powders when the concentration is higher than 200 μg/mL. Moreover, it is found that the cytotoxicity induced on HeLa cells exhibits a certain dose-effect relationship with the concentration of tellurium powders. A conclusion has been reached that the toxicity on HeLa cells can be induced by both nanosized and microsized tellurium powders, and the toxicity of the nanosized tellurium powders is significantly greater than the microsized one. 展开更多
关键词 nanosized and microsized tellurium powder HeLa cells oxidative damage reactive oxygen species (ROS) glutathione (GSH) DNA and protein crosslink (DPC) 8-hydroxy-2'-deoxyguanosine 8-OHdG)
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部