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https://www.readbyqxmd.com/read/28324720/highly-sensitive-electrochemical-detection-of-palmatine-using-a-biocompatible-multiwalled-carbon-nanotube-poly-l-lysine-composite
#1
Balamurugan Thirumalraj, Subbiramaniyan Kubendhiran, Shen-Ming Chen, Kuan-Yu Lin
To date, the natural alkaloids are mostly used in the field of pharmacological applications and the active substance of palmatine was extensively used in cancer therapy and other biomedical applications. Hence, in this study we report a simple preparation of poly-l-lysine (PLL) electro-polymerized on the surface of functionalized multiwalled carbon nanotubes (f-MWCNT) for electrochemical detection of palmatine content in human serum and urine samples. The active amino group of PLL plays a vital role towards the oxidation palmatine and exhibits superior electrocatalytic activity...
March 10, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28320095/dt-13-a-saponin-monomer-13-of-the-dwarf-lilyturf-tuber-synergized-with-vinorelbine-to-induce-mitotic-arrest-via-activation-of-erk-signaling-pathway-in-nci-h1299-cells
#2
Hongyang Li, Li Sun, Hang Li, Xiaodan Lv, Herve Semukunzi, Ruiming Li, Jun Yu, Shengtao Yuan, Sensen Lin
Vinorelbine (NVB) is a semi-synthetic vinca alkaloid that is approved for the clinical therapy of lung cancer. However, the clinical application of NVB was limited because of the acquisition of resistance and inacceptable toxicity. Therefore, it is of great interest to develop low-cytotoxic drugs that can synergize with NVB. DT-13, a saponin monomer 13 of the Dwarf lilyturf tuber, showed inhibitory effects on tumor metastasis and angiogenesis in the previous studies. Here, we found that DT-13 combined with NVB exhibited synergistic effect to inhibit the cell proliferation in human lung cancer NCI-H1299 cells rather than human embryonic lung fibroblasts WI-38...
March 16, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28318534/a-multidrug-and-toxic-compound-extrusion-transporter-mediates-berberine-accumulation-into-vacuoles-in-coptis-japonica
#3
Kojiro Takanashi, Yasuyuki Yamada, Takayuki Sasaki, Yoko Yamamoto, Fumihiko Sato, Kazufumi Yazaki
Plants produce a large variety of alkaloids, which have diverse chemical structures and biological activities. Many of these alkaloids accumulate in vacuoles. Although some membrane proteins on tonoplasts have been identified as alkaloid uptake transporters, few have been characterized to date, and relatively little is known about the mechanisms underlying alkaloid transport and accumulation in plant cells. Berberine is a model alkaloid. Although all genes involved in berberine biosynthesis, as well as the master regulator, have been identified, the gene responsible for the final accumulation of berberine at tonoplasts has not been determined...
March 16, 2017: Phytochemistry
https://www.readbyqxmd.com/read/28317265/simultaneous-determination-of-eight-alkaloids-and-oleandrin-in-herbal-cosmetics-by-dispersive-solid-phase-extraction-coupled-with-ultra-high-performance-liquid-chromatography-and-tandem-mass-spectrometry
#4
Zhiqing Xun, Donghong Liu, Rongrong Huang, Shuang He, Du Hu, Xindong Guo, Yanping Xian
We utilized ultra high performance liquid chromatography with tandem mass spectrometry and dispersive solid-phase extraction to develop a new method for the detection of nine analytes (scopolamine, cephaeline, strychnine, hyoscyamine, brucine, hydrastine, ajmalicine, colchicine and oleandrin) in herbal cosmetics. Acetonitrile/water and 2-propylaminoethylamine were used to disperse and purify during the dispersive solid-phase extraction step. The analytes were separated by a Waters UPLC HSS T3 column and detected through electrospray ionization source in the positive mode with multi-reaction monitoring conditions...
March 20, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/28315618/interaction-of-vasicine-with-calf-thymus-dna-molecular-docking-spectroscopic-and-differential-scanning-calorimetric-insights
#5
Sai Murali R S, Sai Siddhardha R S, Rajesh Babu D, Venketesh S, Basavaraju R, Nageswara Rao G
The present study brings out the interaction between vasicine, an alkaloid and Adhatoda vasica Nees with double stranded DNA. The physico-chemical interaction between small molecules and nucleic acids is a major area of focus in screening drugs against various cancers. Molecular probing in our study using Molecular Operating Environment (MOE) has revealed interaction of vasicine with DNA double helix. Here we report the interaction of vasicine with Calf thymus DNA. We present for the first time the results obtained from UV-visible, fluorescence spectroscopic and differential scanning calorimetric techniques that suggest a moderate to strong electrostatic, hydrophobic and van der Waals interactions mediating the DNA binding properties of vasicine, leading to disruption of DNA secondary structure...
March 8, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28314899/variation-in-the-prevalence-and-transmission-of-heritable-symbionts-across-host-populations-in-heterogeneous-environments
#6
Michelle E Sneck, Jennifer A Rudgers, Carolyn A Young, Tom E X Miller
Heritable microbes are abundant in nature and influential to their hosts and the communities in which they reside. However, drivers of variability in the prevalence of heritable symbionts and their rates of transmission are poorly resolved, particularly across host populations experiencing variable biotic and abiotic environments. To fill these gaps, we surveyed 25 populations of two native grasses (Elymus virginicus and Elymus canadensis) across the southern Great Plains (USA). Both grass species host heritable endophytic fungi (genus Epichloё) and can hybridize where their ranges overlap...
March 17, 2017: Microbial Ecology
https://www.readbyqxmd.com/read/28314480/airways-antiallergic-effect-and-pharmacokinetics-of-alkaloids-from-alstonia-scholaris
#7
Yun-Li Zhao, Jing Cao, Jian-Hua Shang, Ya-Ping Liu, Afsar Khan, Heng-Shan Wang, Yi Qian, Lu Liu, Min Ye, Xiao-Dong Luo
BACKGROUND: Alstonia scholaris (L.) R. Br. (Apocynaceae), an important herbal medicine, has been widely used to treat respiratory tract diseases, such as cough, asthma, phlegm, and chronic obstructive pulmonary disease. PURPOSE: To evaluate pharmacological effect of alkaloids from A. scholaris on ovalbumin induced airways allergic inflammatory model, and explore whether the dosing frequency is related to pharmacokinetics. STUDY DESIGN: After oral administration of total alkaloids, the pharmacokinetic study of it was investigated...
April 15, 2017: Phytomedicine: International Journal of Phytotherapy and Phytopharmacology
https://www.readbyqxmd.com/read/28314276/evodiamine-induces-cell-growth-arrest-apoptosis-and-suppresses-tumorigenesis-in-human-urothelial-cell-carcinoma-cells
#8
Chung-Sheng Shi, Jhy-Ming Li, Chih-Chien Chin, Yi-Hung Kuo, Ying-Ray Lee, Yun-Ching Huang
BACKGROUND/AIM: Evodiamine, an indole alkaloid derived from Evodia rutaecarpa, exhibits pharmacological activities including vasodilatation, analgesia, anti-cardiovascular disease, anti-Alzheimer's disease, anti-inflammation, and anti-tumor activity. MATERIALS AND METHODS: This study analyzes the anti-tumor effects of evodiamine on cellular growth, tumorigenesis, cell cycle and apoptosis induction of human urothelial cell carcinoma (UCC) cells. RESULTS: The present study showed that evodiamine significantly inhibited the proliferation of UCC cells in a dose- and time-dependent manner...
March 2017: Anticancer Research
https://www.readbyqxmd.com/read/28314119/a-combined-in-vitro-assay-for-evaluation-of-neurotrophic-activity-and-cytotoxicity
#9
Narayan D Chaurasiya, Surabhi Shukla, Babu L Tekwani
Neurotrophic assays are phenotypic methods to identify molecules that stimulate differentiation of neuronal cells. Bioactive small molecules with neurotrophic actions hold great promise as therapeutic agents for the treatment of neurodegenerative diseases and neuronal injuries by virtue of their ability to stimulate neuritic outgrowth. A combined in vitro method, which measures neurotrophic activity and cytotoxicity in a single assay, has been described. This assay, performed in 96-well microplates with PC12 and Neuroscreen-1 (NS-1; a subclone of PC12) cells, is a simple tool for identification of new neurotrophic agents...
March 1, 2017: SLAS Discov
https://www.readbyqxmd.com/read/28304352/in-vitro-anti-inflammatory-and-cytotoxic-effects-of-aqueous-extracts-from-the-edible-sea-anemones-anemonia-sulcata-and-actinia-equina
#10
Tânia Costa Silva, Paula Branquinho de Andrade, Fátima Paiva-Martins, Patrícia Valentão, David Micael Pereira
Marine invertebrates have been attracting the attention of researchers for their application in nutrition, agriculture, and the pharmaceutical industry, among others. Concerning sea anemones (Cnidaria), little is known regarding their metabolic profiles and potential value as a source of pharmacologically-active agents. In this work, the chemical profiles of two species of sea anemones Actinia equina and Anemonia sulcata, were studied by high-performance liquid chromatography with diode-array detection (HPLC-DAD) and its impact upon immune and gastric cells was evaluated...
March 17, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28304168/a-total-synthesis-of-%C3%A2-3-o-demethylmacronine-through-rearrangement-of-a-precursor-embodying-the-haemanthidine-alkaloid-framework
#11
Xiang Ma, Nadia Yuqian Gao, Martin G Banwell, Paul D Carr, Anthony C Willis
A total synthesis of the racemic modification, (±)-2, of the tazettine-type alkaloid 3-O-demethylmacronine is described. The key steps are an intramolecular Alder-ene (IMAE) reaction and a lactam-to-lactone rearrangement of tetracycle 13, a compound that embodies the haemanthidine alkaloid framework.
March 17, 2017: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28302224/-advances-in-the-research-of-the-regulation-of-chinese-traditional-medicine-monomer-and-its-derivatives-on-autophagy-in-non-small-cell-lung-cancer
#12
Meiyi Xiang, Ruilei Li, Zhiwei Zhang, Xin Song
The high morbidity and mortality of non-small cell lung cancer (NSCLC) did influence the quality of life of tumor patients world-wide. There is an urgent need to develop new therapies that have high anti-tumor activity and low toxicity side effects. It is widely accepted that autophagy can play diverse roles in carcinogenesis, such as induces pro-death of lung cancer cells or helps the escape from cell death, making it become a proper anticancer target. It's believed that various monomers of Chinese traditional medicine closely correlates to anti-NSCLC activities, and that even could affect the acquired multiple drug resistance (MDR)...
March 20, 2017: Zhongguo Fei Ai za Zhi, Chinese Journal of Lung Cancer
https://www.readbyqxmd.com/read/28301214/novel-glycopyrrolidine-compounds-inhibit-human-cancer-cell-proliferation-and-induce-apoptotic-mode-of-cell-death
#13
Hemadev Bhoopalan, Shilpa Tentu, Prasana R, Purushothaman S, Akkanapally Venu, Ragavachary Raghunathan, Suresh Babu Pakala, Suresh Kumar Rayala, Ganesh Venkatraman
Spirocyclic compounds, present in a number of bioactive natural alkaloids, are cyclic systems containing one carbon atom common to two rings. A highly regioselective glycopyrrolidine compound library was synthesized using 1,3-dipolar cycloaddition method, and its efficacy was tested on cell lines representing most commonly occurring cancers and the molecular mechanism of cell death deciphered. Results showed that among the 16 compounds screened, RPRR210 showed the most potent anticancer activity and induced cell cycle arrest, inhibited migration, caused cell death by inducing apoptosis through the intrinsic pathway, and were nontoxic to normal cells...
March 16, 2017: Cancer Investigation
https://www.readbyqxmd.com/read/28301144/cinchona-alkaloid-squaramide-catalyzed-sulfa-michael-addition-reaction-mode-of-bifunctional-activation-and-origin-of-stereoinduction
#14
Jinlong Guo, Ming Wah Wong
The mechanism of enantioselective sulfa-Michael addition reaction catalyzed by a cinchona alkaloid-squaramide bifunctional organocatalyst was studied using density functional theory (DFT). Four possible modes of dual activation mechanism via hydrogen bonds were considered. Our study showed that Houk's bifunctional Brønsted acid-hydrogen bonding model, which works for cinchonidine or cinchona alkaloid-urea catalyzed sulfa-Michael addition reaction, also applies to the catalytic system under investigation. In addition, we examined the origin of the stereoselectivity by identifying stereocontrolling transition states...
March 16, 2017: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28300700/five-new-koumine-type-alkaloids-from-the-roots-of-gelsemium-elegans
#15
Wei Zhang, Sheng-Yuan Zhang, Gui-Yang Wang, Ni-Ping Li, Min-Feng Chen, Ji-Hong Gu, Dong-Mei Zhang, Lei Wang, Wen-Cai Ye
Five new koumine-type alkaloids (1-5) along with six known ones were isolated from the roots of Gelsemium elegans. Their structures with absolute configurations were elucidated on the basis of NMR spectroscopy and electronic circular dichroism spectral analyses. The inhibitory effects of compounds 1-11 on the viability of three tumor cell lines (A-649, HepG2, and HuH7) were evaluated by the MTT assay.
March 11, 2017: Fitoterapia
https://www.readbyqxmd.com/read/28300624/neurotoxicity-of-the-steroidal-alkaloids-tomatine-and-tomatidine-is-rip1-kinase-and-caspase-independent-and-involves-the-eif2%C3%AE-branch-of-the-endoplasmic-reticulum
#16
Daniela Correia da Silva, Paula B Andrade, Patrícia Valentão, David M Pereira
Steroidal alkaloids are a class of natural products that occur in several species of the Solanaceae family. In the case of tomato plant (Lycopersicon esculentum Mill.), tomatine and its aglycone, tomatidine, are the most representative molecules. These steroidal alkaloids have already shown several potentially useful biological activities, from anticancer to anti-inflammatory or antibacterial. In this work, the toxicity of these molecules in neuronal cells, namely in the neuroblastoma cell line SH-SY5Y, was assessed, emphasis being given to the cellular mechanisms underlying the effects observed...
March 11, 2017: Journal of Steroid Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/28300330/synthesis-and-super-potent-anticancer-activity-of-tubulysins-carrying-non-hydrolysable-n-substituents-on-tubuvaline
#17
Monica Sani, Paolo Lazzari, Marco Folini, Marco Spiga, Valentina Zuco, Michelandrea De Cesare, Ilaria Manca, Sergio Dall'Angelo, Massimo Frigerio, Igor Usai, Andrea Testa, Nadia Zaffaroni, Matteo Zanda
Synthetic tubulysins 24a-m, having non-hydrolysable N-substituents on tubuvaline (Tuv), were obtained in high purity and good overall yields using a multi-step synthesis. Key step was the formation of differently N-substituted Ile-Tuv fragments 10 via aza-Michael reaction of azido-Ile derivatives 8 with the -unsaturated oxo-thiazole 5. A SAR study using a panel of human tumor cell lines showed strong anti-proliferative activity for all compounds 24a-m, with IC50 values in the sub-nanomolar range, which were distinctly lower than those of Tubulysin A, vinorelbine, and paclitaxel...
March 16, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28300233/ergot-alkaloids-synthetic-approaches-to-lysergic-acid-and-clavine-alkaloids
#18
REVIEW
Haichao Liu, Yanxing Jia
Covering: 2000 to 2017Ergot alkaloids are among the most important pharmaceuticals and natural toxins. Significant progress has been achieved in recent years on the research of ergot alkaloids. In this review, we re-introduced the history of ergot alkaloids. Meanwhile, we summarized all the natural products and semi-synthetic derivatives of ergot alkaloids. We also briefly described the biosynthesis and semi-synthesis of ergot alkaloid drugs from raw materials obtained by fermentation. Moreover, we reviewed the advances that have been made in the total synthesis of ergot alkaloids since 2000...
March 16, 2017: Natural Product Reports
https://www.readbyqxmd.com/read/28299544/biotechnology-of-the-medicinal-plant-rhazya-stricta-a-little-investigated-member-of-the-apocynaceae-family
#19
REVIEW
Amir Akhgari, Kirsi-Marja Oksman-Caldentey, Heiko Rischer
Rhazya stricta Decne. (Apocynaceae) is an important medicinal plant that is widely distributed in the Middle East and Indian sub-continent. It produces a large number of terpenoid indole alkaloids (TIAs) some of which possess important pharmacological properties. However, the yields of these compounds are very low. Establishment of a reliable, reproducible and efficient transformation method and induction of hairy roots system is a vital prerequisite for application of biotechnology in order to improve secondary metabolite yields...
March 15, 2017: Biotechnology Letters
https://www.readbyqxmd.com/read/28298629/identification-and-analysis-of-genes-associated-with-the-synthesis-of-bioactive-constituents-in-dendrobium-officinale-using-rna-seq
#20
Chenjia Shen, Hong Guo, Hailing Chen, Yujun Shi, Yijun Meng, Jiangjie Lu, Shangguo Feng, Huizhong Wang
Dendrobium officinale L. is an important traditional herb with high commercial value in China. Several bioactive constituents, including polysaccharides and alkaloids, reportedly make major contributions toward the excellent medicinal effect of D. officinale. In this study, the contents of polysaccharides and alkaloids in various organs of D. officinale were measured and compared. We took advantage of transcriptomes from four organs to explore biological mechanisms in the organ-specific distribution of active ingredients in D...
March 15, 2017: Scientific Reports
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