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Imprinting at the KBTBD6 locus involves species-specific m ternal methylation and monoallelic expression in livestock animals
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作者 Jinsoo Ahn In-Sul Hwang +2 位作者 Mi-Ryung Park Seongsoo Hwang Kichoon Lee 《Journal of Animal Science and Biotechnology》 SCIE CAS CSCD 2024年第1期127-145,共19页
Background The primary differentially methylated regions(DMRs) which are maternally hypermethylated serve as imprinting control regions(ICRs) that drive monoallelic gene expression, and these ICRs have been investigat... Background The primary differentially methylated regions(DMRs) which are maternally hypermethylated serve as imprinting control regions(ICRs) that drive monoallelic gene expression, and these ICRs have been investigated due to their implications in mammalian development. Although a subset of genes has been identified as imprinted, in-depth comparative approach needs to be developed for identification of species-specific imprinted genes. Here, we examined DNA methylation status and allelic expression at the KBTBD6 locus across species and tissues and explored potential mechanisms of imprinting.Results Using whole-genome bisulfite sequencing and RNA-sequencing on parthenogenetic and normal porcine embryos, we identified a maternally hypermethylated DMR between the embryos at the KBTBD6 promoter Cp G island and paternal monoallelic expression of KBTBD6. Also, in analyzed domesticated mammals but not in humans, non-human primates and mice, the KBTBD6 promoter Cp G islands were methylated in oocytes and/or allelically methyl-ated in tissues, and monoallelic KBTBD6 expression was observed, indicating livestock-specific imprinting. Further analysis revealed that these Cp G islands were embedded within transcripts in porcine and bovine oocytes which coexisted with an active transcription mark and DNA methylation, implying the presence of transcription-dependent imprinting.Conclusions In this study, our comparative approach revealed an imprinted expression of the KBTBD6 gene in domesticated mammals, but not in humans, non-human primates, and mice which implicates species-specific evolution of genomic imprinting. 展开更多
关键词 Differentially methylated region Domesticated mammal IMPRINTING KBTBD6 PARTHENOGENETIC
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A Polyvinyl Alcohol/Acrylamide Hydrogel with Enhanced Mechanical Properties Promotes Full-Thickness Skin Defect Healing by Regulating Immunomodulation and Angiogenesis Through Paracrine Secretion 被引量:1
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作者 Peng Wang Liping Qian +9 位作者 Huixin Liang Jianhao Huang Jing Jin Chunmei Xie Bin Xue Jiancheng Lai Yibo Zhang Lifeng Jiang Lan Li Qing Jiang 《Engineering》 SCIE EI CAS CSCD 2024年第6期138-151,共14页
Hydrogel-based tissue-engineered skin has attracted increased attention due to its potential to restore the structural integrity and functionality of skin.However,the mechanical properties of hydrogel scaffolds and na... Hydrogel-based tissue-engineered skin has attracted increased attention due to its potential to restore the structural integrity and functionality of skin.However,the mechanical properties of hydrogel scaffolds and natural skin are substantially different.Here,we developed a polyvinyl alcohol(PVA)/acrylamide based interpenetrating network(IPN)hydrogel that was surface modified with polydopamine(PDA)and termed Dopa-gel.The Dopa-gel exhibited mechanical properties similar to native skin tissue and a superior ability to modulate paracrine functions.Furthermore,a tough scaffold with tensile resistance was fabricated using this hydrogel by three-dimensional printing.The results showed that the interpenetration of PVA,alginate,and polyacrylamide networks notably enhanced the mechanical properties of the hydrogel.Surface modification with PDA endowed the hydrogels with increased secretion of immunomodulatory and proangiogenic factors.In an in vivo model,Dopa-gel treatment accelerated wound closure,increased vascularization,and promoted a shift in macrophages from a proinflammatory M1 phenotype to a prohealing and anti-inflammatory M2 phenotype within the wound area.Mechanistically,the focal adhesion kinase(FAK)/extracellular signal-related kinase(ERK)signaling pathway may mediate the promotion of skin defect healing by increasing paracrine secretion via the Dopa-gel.Additionally,proangiogenic factors can be induced through Rho-associated kinase-2(ROCK-2)/vascular endothelial growth factor(VEGF)-mediated paracrine secretion under tensile stress conditions.Taken together,these findings suggest that the multifunctional Dopa-gel,which has good mechanical properties similar to those of native skin tissue and enhanced immunomodulatory and angiogenic properties,is a promising scaffold for skin tissue regeneration. 展开更多
关键词 Polyvinyl alcohol/acrylamide hydrogel Mechanical property enhancement Paracrine effect Skin regeneration Signaling pathways
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Advances in DNA methylation and its role in cytoplasmic male sterility in higher plants
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作者 Atiqur Rahman Hasan Sofiur Rahman +9 位作者 Shakil Uddin Naima Sultana Shirin Akhter Ujjal Kumar Nath Shamsun Nahar Begum Mazadul Islam Afroz Naznin Nurul Amin Sharif Ahmed Akbar Hossain 《Journal of Integrative Agriculture》 SCIE CSCD 2024年第1期1-19,共19页
The impact of epigenetic modifications like DNA methylation on plant phenotypes has expanded the possibilities for crop development.DNA methylation plays a part in the regulation of both the chromatin structure and ge... The impact of epigenetic modifications like DNA methylation on plant phenotypes has expanded the possibilities for crop development.DNA methylation plays a part in the regulation of both the chromatin structure and gene expression,and the enzyme involved,DNA methyltransferase,executes the methylation process within the plant genome.By regulating crucial biological pathways,epigenetic changes actively contribute to the creation of the phenotype.Therefore,epigenome editing may assist in overcoming some of the drawbacks of genome editing,which can have minor off-target consequences and merely facilitate the loss of a gene’s function.These drawbacks include gene knockout,which can have such off-target effects.This review provides examples of several molecular characteristics of DNA methylation,as well as some plant physiological processes that are impacted by these epigenetic changes in the plants.We also discuss how DNA alterations might be used to improve crops and meet the demands of sustainable and environmentally-friendly farming. 展开更多
关键词 DNA methylation EPIGENETICS CMS male sterility chromatin architecture gene expression higher plants
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Activatable fluorescent probes for imaging and diagnosis of rheumatoid arthritis
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作者 Pan Luo Fu-Qiang Gao +5 位作者 Wei Sun Jun-You Li Cheng Wang Qing-Yu Zhang Zhi-Zhuo Li Peng Xu 《Military Medical Research》 SCIE CAS CSCD 2024年第2期287-307,共21页
Rheumatoid arthritis(RA)is a systemic autoimmune disease that is primarily manifested as synovitis and polyarticular opacity and typically leads to serious joint damage and irreversible disability,thus adversely affec... Rheumatoid arthritis(RA)is a systemic autoimmune disease that is primarily manifested as synovitis and polyarticular opacity and typically leads to serious joint damage and irreversible disability,thus adversely affecting locomotion ability and life quality.Consequently,good prognosis heavily relies on the early diagnosis and effective therapeutic monitoring of RA.Activatable fluorescent probes play vital roles in the detection and imaging of biomarkers for disease diagnosis and in vivo imaging.Herein,we review the fluorescent probes developed for the detection and imaging of RA biomarkers,namely reactive oxygen/nitrogen species(hypochlorous acid,peroxynitrite,hydroxyl radical,nitroxyl),pH,and cysteine,and address the related challenges and prospects to inspire the design of novel fluorescent probes and the improvement of their performance in RA studies. 展开更多
关键词 Rheumatoid arthritis Fluorescent probe IMAGING DIAGNOSIS BIOMARKER
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水稻(Oryza sativa L.)α-淀粉酶基因的进化及组织表达模式 被引量:10
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作者 廖登群 张洪亮 +1 位作者 李自超 John BENNETT 《作物学报》 CAS CSCD 北大核心 2010年第1期17-27,共11页
α-淀粉酶在植物特别是谷类萌发种子淀粉降解中具有重要作用。水稻α-淀粉酶基因的结构、进化和表达研究已有报道,但多集中于OsAmy1和OsAmy3这两个亚族内基因间以及发芽种子中。不同亚族间的基因结构、进化及更多组织和时期的表达特点... α-淀粉酶在植物特别是谷类萌发种子淀粉降解中具有重要作用。水稻α-淀粉酶基因的结构、进化和表达研究已有报道,但多集中于OsAmy1和OsAmy3这两个亚族内基因间以及发芽种子中。不同亚族间的基因结构、进化及更多组织和时期的表达特点尚缺乏细致研究。本研究通过TblastN同源性比对及保守结构域分析揭示水稻基因组含有11个α-淀粉酶基因。生物信息学分析、系统进化树构建及半定量RT-PCR分析表明,该家族基因在结构上发生了明显的分化,具有清晰的进化层次,OsAmy5A和OsAmy4A是家族中较原始状态的基因;在表达和功能上也发生了明显分化,进化水平较高的基因发生了明显的时空表达特异性分化。OsAmy1A、OsAmy3A及OsAmy3D和OsAmy3E分别在保证种子植物世代传递、维持种子休眠过程中胚的微弱生命活动及保证种子萌发过程中能量的稳定持续供应上具有重要作用。 展开更多
关键词 水稻 Α-淀粉酶 基因结构 进化 表达
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产酸相中氧化还原电位控制及其对葡萄糖厌氧发酵产物的影响 被引量:5
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作者 周洪波 Cord-Ruwisch +1 位作者 陈坚 任洪强 《中国沼气》 2000年第4期20-23,共4页
以两种厌氧污泥和一种绵羊胃液 (rumen)的混合物为接种物 ,对葡萄糖进行厌氧发酵。通过调节通气和搅拌控制发酵系统的氧化还原电位 ,考察了恒化器中氧化还原电位对葡萄糖厌氧发酵产物生成的影响。结果表明 ,氧化还原电位对发酵产物有强... 以两种厌氧污泥和一种绵羊胃液 (rumen)的混合物为接种物 ,对葡萄糖进行厌氧发酵。通过调节通气和搅拌控制发酵系统的氧化还原电位 ,考察了恒化器中氧化还原电位对葡萄糖厌氧发酵产物生成的影响。结果表明 ,氧化还原电位对发酵产物有强烈影响。在pH 6和水力停留时间 5h及 10h时 ,在Eh - 550~ - 30 0mV ,乙酸和乳酸是主要产物 ,丁酸浓度随Eh的升高而降低 ,而丙酸和甲酸浓度随Eh升高而增加。当Eh >- 2 0 0mV ,除乙醇外的所有产物浓度都急剧下降 ,而此时的电子回收率极低 ,约为 4 0 %。在Eh >- 10 0mV ,pH <3 5的条件下 ,酵母是主要微生物 ,而乙醇是主要产物 ;高的氧化还原电位有利于酵母的生长 ,而低的氧化还原电位有利于乙醇的形成。 展开更多
关键词 产酸相 氧化还原电位 葡萄糖 厌氧发酵 发酵产物
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响应面法优化姬松茸液体发酵培养基中红糖和酵母膏浓度 被引量:11
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作者 范雷法 潘慧娟 +1 位作者 Soccol CR Pandey A 《食用菌学报》 2005年第3期27-31,共5页
运用响应面分析法优化姬松茸液体发酵培养基中红糖和酵母膏浓度。结果表明,红糖浓度为20.24g/L、酵母膏浓度为2.055g/L时,菌丝体生物量最高,达2.279g/L;红糖浓度为20.8g/L、酵母膏浓度为2.23g/L时,胞外多糖产量最高,达0.749g/L。
关键词 响应面分析法 姬松茸 红糖 酵母膏
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姬松茸胞外多糖抗肿瘤活性研究 被引量:7
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作者 范雷法 潘慧娟 +1 位作者 Soccol CR Pamdey A 《食用菌学报》 2004年第2期45-47,共3页
通过深层发酵培养姬松茸菌丝体,滤取菌丝体后获得菌丝体培养液,经沉淀离心收集其胞外粗多糖,再用蒸馏水溶解,取可溶性部分。对接种S 180的小白鼠24h后腹腔注射给药,连续10d,剂量为10mg kg·d。5周后剥取瘤块,与对照组比较瘤重。结... 通过深层发酵培养姬松茸菌丝体,滤取菌丝体后获得菌丝体培养液,经沉淀离心收集其胞外粗多糖,再用蒸馏水溶解,取可溶性部分。对接种S 180的小白鼠24h后腹腔注射给药,连续10d,剂量为10mg kg·d。5周后剥取瘤块,与对照组比较瘤重。结果发现,姬松茸深层发酵生产的胞外多糖对小鼠接种的腹水瘤S 180有较强的抗性,肿瘤抑制率达到44.53%,完全抑制率达到50%。 展开更多
关键词 姬松茸 胞外多糖 抗肿瘤活性 菌丝体培养液
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姬松茸深层发酵生产胞外多糖的碳氮源研究
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作者 潘慧娟 吴应美 +2 位作者 范雷法 Soccol CR Pandey A 《中国食用菌》 2006年第2期44-46,共3页
研究表明摇床振荡培养有利于姬松茸菌丝体生长,而静止培养有利于其胞外多糖的合成。以胞外多糖为目标的研究中,为排除定粉类多糖(碳源)的干扰,红糖是比较理想的碳源,红糖的浓度以20g/L以内,酵母膏是较好的氮源。
关键词 姬松茸 胞外多糖 发酵 碳氮源
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Anthrax: A disease of biowarfare and public health importance 被引量:10
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作者 Ajay Kumar Goel 《World Journal of Clinical Cases》 SCIE 2015年第1期20-33,共14页
Bioterrorism has received a lot of attention in the first decade of this century. Biological agents are considered attractive weapons for bioterrorism as these are easy to obtain, comparatively inexpensive to produce ... Bioterrorism has received a lot of attention in the first decade of this century. Biological agents are considered attractive weapons for bioterrorism as these are easy to obtain, comparatively inexpensive to produce and exhibit widespread fear and panic than the actual potential of physical damage. Bacillus anthracis(B. anthracis), the etiologic agent of anthrax is a Gram positive, spore forming, non-motile bacterium. This is supposed to be one of the most potent BW agents because its spores are extremely resistant to natural conditions and can survive for several decades in the environment. B.anthracis spores enter the body through skin lesion(cutaneous anthrax), lungs(pulmonary anthrax), or gastrointestinal route(gastrointestinal anthrax) and germinate, giving rise to the vegetative form. Anthrax is a concern of public health also in many countries where agriculture is the main source of income including India. Anthrax has been associated with human history for a very long time and regained its popularity after Sept 2001 incidence in United States. The present review article describes the history, biology, life cycle, pathogenicity, virulence, epidemiology and potential of B. anthracis as biological weapon. 展开更多
关键词 ANTHRAX BACILLUS ANTHRACIS Biological warfare EPIDEMIOLOGY Infection PUBLIC health
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In-vitro antimicrobial activity of marine actinobacteria against multidrug resistance Staphylococcus aureus 被引量:5
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作者 Sathish Kumar SR Kokati Venkata Bhaskara Rao 《Asian Pacific Journal of Tropical Biomedicine》 SCIE CAS 2012年第10期787-792,共6页
Objective:To investigate the antibacterial aclivily of marine actinobacteria against multidrug resistance Staphylococcus aureus(MDRSA).Methods:Fifty one actinobacterial strains were isolated from salt pans soil,costal... Objective:To investigate the antibacterial aclivily of marine actinobacteria against multidrug resistance Staphylococcus aureus(MDRSA).Methods:Fifty one actinobacterial strains were isolated from salt pans soil,costal area in Kothapattanam,Ongole,Andhra Pradesh.Primary screening was done using cross-streak method against MDRSA.The bioaclive compounds are extracted from efficient actinobacteria using solvent extraction.The antimicrobial activity of crude and solvent extracts was perfomied using Kirby-Bauer method.MIC for ethyl acetate extract was determined by modified agar well diffusion method.The potent actinobacteria are identified using Nonomura key,Shirling and Gottlieb 1966 with Bergey's manual of determinative bacteriology.Results:Among the fifty one isolates screened for antibacterial activity,SRB25were found efficient against MDRSA.The ethyl acetate extracts showed high inhibition against test organism.MIC test was performed with the ethyl acetate extract against MDRSA and found to be 1 000μg/mL.The isolaled actinobacteria are identified as Streptomyces sp with the help of Nonomura key.Conclusions:The current investigation reveals that the marine actinobacteria from salt pan environment can be able to produce new drug molecules against drug resistant microorganisms. 展开更多
关键词 MARINE ACTINOBACTERIA Salt pan Multi drug resistance STAPHYLOCOCCUS AUREUS Cross STREAK METHOD Kirby-Bauer METHOD MIC Nonomura key
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Matrix metalloproteinases and gastrointestinal cancers: Impacts of dietary antioxidants 被引量:10
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作者 Sugreev Verma Kousik Kesh +2 位作者 Nilanjan Ganguly Sayantan Jana Snehasikta Swarnakar 《World Journal of Biological Chemistry》 CAS 2014年第3期355-376,共22页
The process of carcinogenesis is tightly regulated by antioxidant enzymes and matrix degrading enzymes, namely, matrix metalloproteinases(MMPs). Degradation of extracellular matrix(ECM) proteins like collagen, proteog... The process of carcinogenesis is tightly regulated by antioxidant enzymes and matrix degrading enzymes, namely, matrix metalloproteinases(MMPs). Degradation of extracellular matrix(ECM) proteins like collagen, proteoglycan, laminin, elastin and fibronectin is considered to be the prerequisite for tumor invasion and metastasis. MMPs can degrade essentially all of the ECM components and, most MMPs also substantially contribute to angiogenesis, differentiation, proliferation and apoptosis. Hence, MMPs are important regulators of tumor growth both at the primary site and in distant metastases; thus the enzymes are considered as important targets for cancer therapy. The implications of MMPs in cancers are no longer mysterious; however, the mechanism of action is yet to be explained. Herein, our major interest is to clarify how MMPs are tied up with gastrointestinal cancers. Gastrointestinal cancer is a variety of cancer types, including the cancers of gastrointestinal tract and organs, i.e., esophagus, stomach, biliary system, pancreas, small intestine, large intestine, rectum and anus. The activity of MMPs is regulated by its endogenous inhibitor tissue inhibitor of metallopro-teinase(TIMP) which bind MMPs with a 1:1 stoichiometry. In addition, RECK(reversion including cysteinerich protein with kazal motifs) is a membrane bound glycoprotein that inhibits MMP-2,-9 and-14. Moreover, α2-macroglobulin mediates the uptake of several MMPs thereby inhibit their activity. Cancerous conditions increase intrinsic reactive oxygen species(ROS) through mitochondrial dysfunction leading to altered protease/anti-protease balance. ROS, an index of oxidative stress is also involved in tumorigenesis by activation of different MAP kinase pathways including MMP induction. Oxidative stress is involved in cancer by changing the activity and expression of regulatory proteins especially MMPs. Epidemiological studies have shown that high intake of fruits that rich in antioxidants is associated with a lower cancer incidence. Evidence indicates that some antioxidants inhibit the growth of malignant cells by inducing apoptosis and inhibiting the activity of MMPs. This review is discussed in six subchapters, as follows. 展开更多
关键词 GASTROINTESTINAL cancer MATRIX METALLOPROTEINASE Tissue inhibitor of MATRIX METALLOPROTEINASES Reactive oxygen species ANTIOXIDANTS
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Evaluation of phenolic contents and antioxidant activities of brown seaweeds belonging to Turbinaria spp.(Phaeophyta,Sargassaceae) collected from Gulf of Mannar 被引量:4
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作者 Kajal Chakraborty Nammunayathuputhenkotta Krishnankartha Praveen +1 位作者 Kodayan Kizekadath Vijayan Gonugontla Syda Rao 《Asian Pacific Journal of Tropical Biomedicine》 SCIE CAS 2013年第1期8-16,共9页
Objective:To evaluate the antioxidant activities and total phenolic contents of brown seaweeds belonging to Turbinaria spp.[Turbinaria conoides(T.conoides)and Turbinaria ornata(T.ornata)collected from Gulf of Mannar o... Objective:To evaluate the antioxidant activities and total phenolic contents of brown seaweeds belonging to Turbinaria spp.[Turbinaria conoides(T.conoides)and Turbinaria ornata(T.ornata)collected from Gulf of Mannar of southeastern coast of India in various in vitro systems.Methods:The antioxidant activity was evaluated using different in vitro systems,viz.,I,I-diphenyl-2-picrylhydrazyl(DPPH),2,2'-azino-bis-3 ethylbenzothiozoline-6-sulfonic acid diammonium salt(ABTS),H_20_2/H0 radical scavenging,Fe^(2+)ion chelating ability,and reducing potential.Folin-Ciocalteu method was used to determine the total phenolic content of the extracts,and the results were expressed as mg of gallic acid equivalents(GE)/g of the seaweed extracts.Thiobarbituric acid-reactive substances assay was employed to assess the ability of the seaweed extracts to inhibit lipid oxidation.Results:Ethyl acetate(EtOAc)fraction of T.conoides registered significantly higher phenolic content(105.97 mg GE/g)than that of T.ornata(69.63 mg GE/g).Significantly higher antioxidant potential as determined by DPPH(64.14%)radical scavenging activity was registered in EtOAc fraction of T.ornata.A higher ABTS(?)radical scavenging(IC_(50)3.16μg/mL),Fe^(2+)chelating(IC_(50)0.46 mg/mL),H_2O_2 scavenging(IC_(50)4.25 mg/mL),lipid peroxidation inhibitory(TBARS,IC_(50)0.21 mg/mL),and reducing abilities(IC_(50)52.67 mg/mL)(P<0.05)were realized in EtOAc fraction of T.ornata than other fractions.Conclusions:This study indicated the potential use of T.conoides and T.ornata as candidate species to be used as food supplements/functional foods to increase shelf-life of food items for human consumption,and nutraceuticals to deter deleterious free radical-induced life-threatening diseases. 展开更多
关键词 BROWN seaweeds Turbinaria conoides Turbinaria ornata ANTIOXIDANT activity Total PHENOLIC contents
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Doxycycline blocks gastric ulcer by regulating matrix metalloproteinase-2 activity and oxidative stress 被引量:5
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作者 Laishram Pradeepkumar Singh Amartya Mishra +1 位作者 Debjit Saha Snehasikta Swarnakar 《World Journal of Gastroenterology》 SCIE CAS CSCD 2011年第28期3310-3321,共12页
AIM: To examine the effect of doxycycline on the activity of matrix metalloproteinases (MMPs) and oxidative stress in gastric tissues of rats following gastric injury.METHODS: Gastric ulcers were generated in rats by ... AIM: To examine the effect of doxycycline on the activity of matrix metalloproteinases (MMPs) and oxidative stress in gastric tissues of rats following gastric injury.METHODS: Gastric ulcers were generated in rats by administration of 70% ethanol,and activity of doxycycline was tested by administration 30 min prior to ethanol.Similarly,the effect of doxycycline was tested in an indomethacin-induced gastric ulcer model.The activities and expression of MMPs were examined by zymography and Western blot analysis.RESULTS: Gastric injury in rats as judged by elevated ulcer indices following exposure to ulcerogen,either indomethacin or ethanol,was reversed significantly by doxycycline.Indomethacin-induced ulcerated gastric tissues exhibited about 12-fold higher proMMP-9 activity and about 5-fold higher proMMP-3 activity as compared to control tissues.Similarly,ethanol induced about 22-fold and about 6-fold higher proMMP-9 and proMMP-3 activities,respectively,in rat gastric tissues.Both proMMP-9 and MMP-3 activities were markedly decreased by doxycycline in ulcerogen treated rat gastric tissues.In contrast,the reduced MMP-2 activity in ulcerated tissues was increased by doxycycline during ulcer prevention.On the other hand,doxycycline inhibited significantly proMMP-9,-2 and -3 activities in vitro.In addition,doxycycline reduced oxidative load in gastric tissues and scavenged H2O2 in vitro.Our results suggest a novel regulatory role of doxycycline on MMP-2 activity in addition to inhibitory action on MMP-9 and MMP-3 during prevention of gastric ulcers.CONCLUSION: This is the first demonstration of dual action of doxycycline,that is,regulation of MMP activity and reduction of oxidative stress in arresting gastric injury. 展开更多
关键词 DOXYCYCLINE Extracellular matrix Matrix metalloproteinases Reactive oxygen species Tissue inhibitor of metalloproteinase
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Use of Major Quantitative Trait Loci to Improve Grain Yield of Rice 被引量:8
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作者 GUO Long-biao YE Guo-you 《Rice science》 SCIE 2014年第2期65-82,共18页
Further improvement of rice productivity remains a challenge. Breeding is perceived as an important option to increase rice yield. However, the genetic progress of grain yield in most rice breeding programs was slow i... Further improvement of rice productivity remains a challenge. Breeding is perceived as an important option to increase rice yield. However, the genetic progress of grain yield in most rice breeding programs was slow in the last decades. Although great progress in rice genomics and molecular biology has been achieved, the effect of such technological innovations on rice breeding is far small. Marker-assisted selection (MAS) for a few target quantitative trait loci (QTLs) has significant effects in improving qualitative traits, such as disease resistance. The success of MAS has therefore motivated breeders to identify and use major QTLs for yield and yield component traits. In this review, we summarized the recent methods in QTL identification, including novel statistical methods for linkage and association mapping, special population types, and whole-genome sequencing. We reviewed the successful application of marker-assisted gene introgression and gene pyramiding to improve grain yield and discussed the design of efficient MAS schemes to further increase the success rate of breeding programs. The use of well-characterized major QTLs through introgression and gene pyramiding is proven effective in improving grain yield, particularly yield under abiotic stress. Major QTLs that are stable across genetic background and growing environments are often found in less adapted germplasms, such as landraces and wild relatives. Advanced backcross QTL analysis and introgression lines, which integrate QTL discovery and utilization, are important methods for exploiting major QTLs contained in such germplasms. Next-generation sequencing substantially increases mapping resolution and accelerates the identification of casual genes underlying major QTLs. Practical guidelines derived from theoretical and empirical studies are given to guide the design of efficient marker-assisted gene introgression and pyramiding schemes. 展开更多
关键词 gene pyramiding marker-assisted backcross marker-assisted selection RICE YIELD
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Programmed death-1/programmed death-L1 signaling pathway and its blockade in hepatitis C virus immunotherapy 被引量:9
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作者 Mohamed L Salem Ahmed El-Badawy 《World Journal of Hepatology》 CAS 2015年第23期2449-2458,共10页
Chronic hepatitis C virus(HCV) infection is a public health issue that often progresses to life-threatening complications, including liver cirrhosis, fibrosis, and hepatocellular carcinoma. Impaired immune responses t... Chronic hepatitis C virus(HCV) infection is a public health issue that often progresses to life-threatening complications, including liver cirrhosis, fibrosis, and hepatocellular carcinoma. Impaired immune responses to HCV are key features of chronic HCV infection. Therefore, intervention strategies usually involve enhancing the immune responses against HCV. Cytotoxic CD8+ T lymphocytes(CTLs) play a critical role in the control of HCV infection. However, their cytolytic function can be impaired by the expression of co-inhibitory molecules. Programmed death-1(PD-1) receptor and its ligand PD-L1 function in a T cell co-inhibitory pathway, which either blocks the function of CTLs or the differentiation of CD8+ T cells. During chronic HCV infection, the immune inhibitory receptor PD-1 is upregulated on dysfunctional HCV-specific CD8+ T cells. As such, blockade of the PD-1/PD-L1 pathway in these CD8+ T cells might restore their functional capabilities. Indeed, clinical trials using therapies to block this pathway have shown promise in the fostering of anti-HCV immunity. Understanding how chronic HCV infection induces upregulation of PD-1 on HCV specific T cells and how the PD-1/PD-L1 interaction develops HCV specific T cell dysfunction will accelerate the development of an efficacious prophylactic and therapeutic vaccination against chronic HCV infections, which will significantly improve HCV treatments and patient survival. In this review, we discuss the relationship between PD-1 expression and clinical responses and the potential use of PD-1 blockade for anti-HCV therapy. 展开更多
关键词 HEPATITIS C virus Programmed death-1 HEPATITIS C v
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Hepatitis C virus prevalence and genotype distribution inPakistan:Comprehensive review of recent data 被引量:4
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作者 muhammad umer mazhar iqbal 《World Journal of Gastroenterology》 SCIE CAS 2016年第4期1684-1700,共17页
Hepatitis C virus(HCV) is endemic in Pakistan and its burden is expected to increase in coming decades owing mainly to widespread use of unsafe medical procedures. The prevalence of HCV in Pakistan has previously been... Hepatitis C virus(HCV) is endemic in Pakistan and its burden is expected to increase in coming decades owing mainly to widespread use of unsafe medical procedures. The prevalence of HCV in Pakistan has previously been reviewed. However, the literature search conducted here revealed that at least 86 relevant studies have been produced since the publication of these systematic reviews. A revised updated analysis was therefore needed in order to integrate the fresh data. A systematic review of data published between 2010 and 2015 showed that HCV seroprevalence among the general adult Pakistani population is 6.8%, while active HCV infection was found in approximately 6% of the population. Studies included in this review have also shown extremely high HCV prevalence in rural and underdeveloped peri-urban areas(up to 25%), highlighting the need for an increased focus on this previously neglected socioeconomic stratum of the population. While a 2.45% seroprevalence among blood donors demands immediate measures to curtail the risk of transfusion transmitted HCV, a very high prevalence in patients attending hospitals with various non-liver disease related complaints(up to 30%) suggests a rise in the incidence of nosocomial HCV spread. HCV genotype 3a continues to be the most prevalent subtype infecting people in Pakistan(61.3%). However, recent years have witnessed an increase in the frequency of subtype 2a in certain geographical sub-regions within Pakistan. In Khyber Pakhtunkhwa and Sindh provinces, 2a was the second most prevalent genotype(17.3% and 11.3% respectively). While the changing frequency distribution of various genotypes demands an increased emphasis on research for novel therapeutic regimens, evidence of high nosocomial transmission calls for immediate measures aimed at ensuring safe medical practices. 展开更多
关键词 HEPATITIS C Pakistan HEPATITIS C VIRUS Liver cancer HEPATITIS C VIRUS GENOTYPES EPIDEMIOLOGY
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Genotoxic Effects of PAH Containing Sludge Extracts in Chinese Hamster Ovary Cell Cultures 被引量:4
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作者 K.KRISHNAMURTHI FONTDEVI T.CHAKRABARTI 《Biomedical and Environmental Sciences》 SCIE CAS CSCD 2003年第1期68-82,共15页
Objective Many studies have been conducted in order to evaluate the genotoxicity of chemicals and waste materials, which utilized in vivo test protocols. The use of animals for routine toxicity testing is now question... Objective Many studies have been conducted in order to evaluate the genotoxicity of chemicals and waste materials, which utilized in vivo test protocols. The use of animals for routine toxicity testing is now questioned by a growing segment of society. Methods Keeping the above fact in mind, we have conducted in the present study the genotoxicity evaluation of oily sludge samples generated from a petroleum refinery and petrochemical industry and ETP sludge from petroleum refinery using DNA damage, chromosomal aberration, p53 protein induction and apoptosis in short term in vitro mammalian Chinese Hamster Ovary cell cultures. Results It is evident from the results that the oily sludge compounds derived from petroleum refinery and petrochemical industry could cause DNA damage, chromosomal aberration, p53 protein accumulation and apoptotic cell death on exposure to oily sludge extracts in the presence of metabolic activation system (S-9 mix), however, ETP sludge extract could not cause significant genotoxicity in comparison to oily sludge extract and negative control. Conclusion The effect may be attributed to polycyclic aromatic hydrocarbons present in the samples as evidenced from GC-MS. 展开更多
关键词 DNA damage Chromosomal aberration p53 protein induction Apoptosis GENOTOXICITY Polycyclic aromatic hydrocarbons (PAHs) Gas chromatograph mass spectrometer (GC-MS)
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Gamma Irradiation of Embryogenic Callus Cultures and In vitro Selection for Salt Tolerance in Sugarcane (Saccharum officinarum L.) 被引量:6
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作者 Vikas Y Patade P Suprasanna V A Bapat 《Agricultural Sciences in China》 CAS CSCD 2008年第9期1147-1152,共6页
Radiation induced mutagenesis followed by in vitro selection was employed for salt tolerance in popular Indian sugarcane (Saccharum officinarum L.) cv. CoC-671. Embryogenic calli were gamma irradiated and exposed to... Radiation induced mutagenesis followed by in vitro selection was employed for salt tolerance in popular Indian sugarcane (Saccharum officinarum L.) cv. CoC-671. Embryogenic calli were gamma irradiated and exposed to different levels of NaCl (42.8, 85.6, 128.3, 171.1,213.9, 256.7, 299.5, or 342.2 mM). The relative growth rate (RGR) decreased progressively with increasing salt stress and was the least with a salt stress of 256.7 mM (0.25±0.009), almost 10 fold lesser than the control. The RGR was significantly lower in 85.6 mM and higher salt stressed calli than the control. The survival percent also decreased, with an increase in NaCl concentration. In case of 10 and 20 Gy irradiated calli, regeneration was observed up to 85.6 mM NaCl selection, medium, whereas, higher treatments (128.3 mM and beyond) exhibited browning initially. However, in the subsequent subcultures, regeneration was obtained in the case of 10 and 20 Gy irradiated calli on 128.3 and 171.1 mM NaCl selections. Higher dose of gamma irradiation (40 Gy) also showed regeneration, but only with 85.6 mM NaCI selection. The unirradiated calli regenerated the highest number of plantlets followed by 10 and 20 Gy irradiated calli on salt selection. A total of 147 plantlets were selected from different salt levels. The salt selected plants are being tested for their field performance. 展开更多
关键词 SUGARCANE in vitro mutagenesis in vitro selection salt tolerance
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In vitro callus induction and plantlet regeneration of Achyranthes aspera L.,a high value medicinal plant 被引量:4
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作者 Monokesh Kumer Sen Shamima Nasrin +1 位作者 Shahedur Rahman Abu Hena Mostofa Jamal 《Asian Pacific Journal of Tropical Biomedicine》 SCIE CAS 2014年第1期40-46,共7页
Objective:To study callus induction from different explants(internode,leaf,root)and in vitro plantlets propagation from medicinally important plant Achyranthes aspera L.Methods:Sterilized explants were prepared by uni... Objective:To study callus induction from different explants(internode,leaf,root)and in vitro plantlets propagation from medicinally important plant Achyranthes aspera L.Methods:Sterilized explants were prepared by uning 0.1%HgCl_2 and 0.5%Bavistin and callus was obtained when cultured onto Murashige Skoog's(MS)medium by using different concentrations and combination of 2,4-D.NAA.BAP,IAA,IBA with 3%sucrose and 0.8%agar.Induced callus was immediately transferred to MS medium containing at different concentrations of phytohormones for shootlets and rootlets induction respectively.Results:Sterilization treatment of 0.1%HgCl_2.for 2-3 min and Bavistin 0.5%for 10-12 min showed the highest percentage of asepsis and survival rate.Maximum induction of callus was obtained from a combination of 2.0 mg/L 2,4-D and 0.5 mg/L NAA from leaf.Highest shootlets number(4.83±0.l7)and length(3.8±0.16)cm were observed on full strength MS medium when fortified with BAP 4.0 mg/L and KIN 0.5 mg/L.Concerted efforts of BAP 10 mg/L and NAA 0.5 mg/L on full strength MS medium showed highest leaf number(6.77±0.94).In vitro raised shoots were allowed to root on different strengths of MS medium fortified with IAA and IBA at different concentrations.Experimentally,3.0 mg/L IBA was enabled to induce maximum rootlets number(10.0±9.82)on full strength MS medium.Afterwards,regenerated shoots with well developed roots were successfully subjected to hardening process and were acclimatized.The survived plantlets showed 66.67%survival frequency without any morphological abnormality.Conclusions:The results demonstrated that different explants were good source of callus induction,morphology analysis as well as indirect plantlets regeneration. 展开更多
关键词 Achyranthes aspera CALLUS INDUCTION PLANTLETS propagation Murashige Skoog’s MICROPROPAGATION
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