Objective Neurodegenerative diseases, such as ischemia, traumatic injury, Alzheimer＇s disease, and Parkinson＇s disease are characterized by neuronal loss and dysfunction. It is known that glutamate-induced toxicity ...Objective Neurodegenerative diseases, such as ischemia, traumatic injury, Alzheimer＇s disease, and Parkinson＇s disease are characterized by neuronal loss and dysfunction. It is known that glutamate-induced toxicity plays an important role in neurodegenerative diseases. Glutamate toxicity seems to be mediated by excessive influx of Ca^（2＋） into neuronal cells through activation of N-methyl-D-aspartate（NMDA） receptor. To search for potential NMDA receptor inhibitors in traditional Chinese medicine. Methods A series of computer methods including drug-likeness evaluation, ADMET tests as well as molecular docking have been used. Results 1,5-O-dicaffeoyl-quinic acid was identified as NMDA receptor inhibitor by virtual screening. Its neuroprotective activity was further confirmed by in vitro test. 1,5-O-dicaffeoyl-quinic acid showed strong neuroprotection against NMDA-induced cell injury. Conclusion 1,5-O-Dicaffeoylquinic acid may be regarded as a potential NMDA receptor inhibitor for the prevention and treatment of neurodegenerative disorders.展开更多
According to synthetic pathway of plant chlorogenic acid （CGA）, the expression patterns of genes encoding enzymes that are associated with CGA synthesis were studied in normally developed Xuehua pear fruit. The stud...According to synthetic pathway of plant chlorogenic acid （CGA）, the expression patterns of genes encoding enzymes that are associated with CGA synthesis were studied in normally developed Xuehua pear fruit. The study demonstrated that CGA content in peel and flesh of Xuehua pear decreased as fruit development progressed, with a higher level in peel. The expression levels of PbPAL 1, PbPAL2, PbC3H, PbC4H, Pb4CL 1, Pb4CL2, Pb4CL6, PbHC T1 and PbHC T3 genes decreased in fruit, which was consistent with the pattern of variation in CGA content. That indicated that these genes might be key genes for influencing fruit CGA synthesis in Xuehua pear. However, Pb4CL7 gene expression profile is not consistent with variation of CGA content, hence, it may not be a key gene involved in CGA synthesis.展开更多
In aquaculture,high-density seaweed farming brings higher economic benefits but also increases outbreaks of diatom felt.The effective control of diatom felt in high-density seaweed farming has always been a research h...In aquaculture,high-density seaweed farming brings higher economic benefits but also increases outbreaks of diatom felt.The effective control of diatom felt in high-density seaweed farming has always been a research hotspot.This study selected two potential allelochemicals 2-hydroxycinnamic acid and quinic acid to explore their effects on a diatom Nitzschia closterium and an economic seaweed Monostroma nitidum.The results showed that 2-hydroxycinnamic acid had better inhibitory effects than quinic acid on the growth,pigment content and photosynthetic efficiency of N.closterium.Their half-maximal inhibitory concentrations at 120 h(IC_(50–120 h))were 0.9000 and 1.278 mM,respectively.Additionally,these allelochemicals had limited inhibitory effects on the growth,pigment content and photosynthetic efficiency of M.nitidum before 24 h.To further explore the allelopathic effect of these chemicals,this study focused on the photosystem II energy fluxes of N.closterium.It was found that 3 mM 2-hydroxycinnamic acid could destroy the whole photosynthetic system by devastating the PSII reaction centre(RC)before 24 h;however,the same concentration of quinic acid could only down-regulate the electron transport efficiency by changing the effective antenna size of an active RC and downregulating the PSII reaction centre density.These experimental results are expected to provide a new strategy to control diatom felt blooms on the high-density seaweed farming areas.展开更多
目的研究小花鬼针草B id ens p arv if lora全株的化学成分,并通过抑制组胺释放活性方法寻找生物活性化合物。方法采用硅胶、Sephadex LH-20和ODS柱色谱分离化合物,运用1D NM R,2D NM R等波谱法鉴定了化学结构,通过组胺抑制实验探讨抗...目的研究小花鬼针草B id ens p arv if lora全株的化学成分,并通过抑制组胺释放活性方法寻找生物活性化合物。方法采用硅胶、Sephadex LH-20和ODS柱色谱分离化合物,运用1D NM R,2D NM R等波谱法鉴定了化学结构,通过组胺抑制实验探讨抗炎活性。结果分离鉴定6种咖啡酰奎宁酸类化合物及其甲酯,分别是3,5-二氧咖啡酰奎宁酸(3,5-d i-O-caffeoy lqu in ic ac id,Ⅰ)、3,4-二氧咖啡酰奎宁酸(3,4-d i-O-caffeoy lqu in ic ac id,Ⅱ)、4,5-二氧咖啡酰奎宁酸(4,5-d i-O-caffeoy lqu in ic ac id,Ⅲ)、4-氧-咖啡酰奎宁酸(4-O-caffeoy lqu in ic ac id,Ⅳ)、5-氧-咖啡酰奎宁酸(5-O-caffeoy lqu in ic ac id,Ⅴ)、4-[3-(3,4-二羟基苯基)-丙烯酰氧基]-2,3-二羟基-2-甲基-丁酸{4-[3-(3,4-d ihydroxy-pheny l)-acry loy loxy]-2,3-d ihydroxy-2-m ethy l-bu tyric ac id,Ⅵ}。结论所有化合物均为首次从该植物中分得,化合物Ⅵ为新化合物。这些化合物显示一定的抑制组织胺释放活性。展开更多
基金Key National Science and Technology Specific Project of China(2014ZX09J14101-05C)
文摘Objective Neurodegenerative diseases, such as ischemia, traumatic injury, Alzheimer＇s disease, and Parkinson＇s disease are characterized by neuronal loss and dysfunction. It is known that glutamate-induced toxicity plays an important role in neurodegenerative diseases. Glutamate toxicity seems to be mediated by excessive influx of Ca^（2＋） into neuronal cells through activation of N-methyl-D-aspartate（NMDA） receptor. To search for potential NMDA receptor inhibitors in traditional Chinese medicine. Methods A series of computer methods including drug-likeness evaluation, ADMET tests as well as molecular docking have been used. Results 1,5-O-dicaffeoyl-quinic acid was identified as NMDA receptor inhibitor by virtual screening. Its neuroprotective activity was further confirmed by in vitro test. 1,5-O-dicaffeoyl-quinic acid showed strong neuroprotection against NMDA-induced cell injury. Conclusion 1,5-O-Dicaffeoylquinic acid may be regarded as a potential NMDA receptor inhibitor for the prevention and treatment of neurodegenerative disorders.
基金supported by the Specific Financial Funds of Hebei Province,China (494-0502-JSN-7FB3)
文摘According to synthetic pathway of plant chlorogenic acid （CGA）, the expression patterns of genes encoding enzymes that are associated with CGA synthesis were studied in normally developed Xuehua pear fruit. The study demonstrated that CGA content in peel and flesh of Xuehua pear decreased as fruit development progressed, with a higher level in peel. The expression levels of PbPAL 1, PbPAL2, PbC3H, PbC4H, Pb4CL 1, Pb4CL2, Pb4CL6, PbHC T1 and PbHC T3 genes decreased in fruit, which was consistent with the pattern of variation in CGA content. That indicated that these genes might be key genes for influencing fruit CGA synthesis in Xuehua pear. However, Pb4CL7 gene expression profile is not consistent with variation of CGA content, hence, it may not be a key gene involved in CGA synthesis.
基金sponsored by the Ph.D.Start-Up Foundation of Guangdong Ocean University(R19049)Science and Technology Planning Project of Guangdong(2017A030303078)Undergraduate Start-Up Foundation of Guangdong Ocean University(580520135 and 570119011).
文摘In aquaculture,high-density seaweed farming brings higher economic benefits but also increases outbreaks of diatom felt.The effective control of diatom felt in high-density seaweed farming has always been a research hotspot.This study selected two potential allelochemicals 2-hydroxycinnamic acid and quinic acid to explore their effects on a diatom Nitzschia closterium and an economic seaweed Monostroma nitidum.The results showed that 2-hydroxycinnamic acid had better inhibitory effects than quinic acid on the growth,pigment content and photosynthetic efficiency of N.closterium.Their half-maximal inhibitory concentrations at 120 h(IC_(50–120 h))were 0.9000 and 1.278 mM,respectively.Additionally,these allelochemicals had limited inhibitory effects on the growth,pigment content and photosynthetic efficiency of M.nitidum before 24 h.To further explore the allelopathic effect of these chemicals,this study focused on the photosystem II energy fluxes of N.closterium.It was found that 3 mM 2-hydroxycinnamic acid could destroy the whole photosynthetic system by devastating the PSII reaction centre(RC)before 24 h;however,the same concentration of quinic acid could only down-regulate the electron transport efficiency by changing the effective antenna size of an active RC and downregulating the PSII reaction centre density.These experimental results are expected to provide a new strategy to control diatom felt blooms on the high-density seaweed farming areas.
基金The National Natural Science Foundation of China(No.30571292)Fujian Provincial Natural Science Foundation of Fujian Province,China(No.B0310008)Scientific Foundation from Fujian Provincial Department of Education,China(No.JA05231)
文摘目的研究小花鬼针草B id ens p arv if lora全株的化学成分,并通过抑制组胺释放活性方法寻找生物活性化合物。方法采用硅胶、Sephadex LH-20和ODS柱色谱分离化合物,运用1D NM R,2D NM R等波谱法鉴定了化学结构,通过组胺抑制实验探讨抗炎活性。结果分离鉴定6种咖啡酰奎宁酸类化合物及其甲酯,分别是3,5-二氧咖啡酰奎宁酸(3,5-d i-O-caffeoy lqu in ic ac id,Ⅰ)、3,4-二氧咖啡酰奎宁酸(3,4-d i-O-caffeoy lqu in ic ac id,Ⅱ)、4,5-二氧咖啡酰奎宁酸(4,5-d i-O-caffeoy lqu in ic ac id,Ⅲ)、4-氧-咖啡酰奎宁酸(4-O-caffeoy lqu in ic ac id,Ⅳ)、5-氧-咖啡酰奎宁酸(5-O-caffeoy lqu in ic ac id,Ⅴ)、4-[3-(3,4-二羟基苯基)-丙烯酰氧基]-2,3-二羟基-2-甲基-丁酸{4-[3-(3,4-d ihydroxy-pheny l)-acry loy loxy]-2,3-d ihydroxy-2-m ethy l-bu tyric ac id,Ⅵ}。结论所有化合物均为首次从该植物中分得,化合物Ⅵ为新化合物。这些化合物显示一定的抑制组织胺释放活性。
