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https://www.readbyqxmd.com/read/29777940/curcumin-attenuates-cerebral-ischemia-injury-in-sprague-dawley-rats-and-pc12-cells-by-suppressing-overactivated-autophagy
#1
Yan Zhang, Ming Fang, Yameng Sun, Ting Zhang, Nan Shi, Jinfeng Li, Lei Jin, Kangyong Liu, Jianliang Fu
The present study assessed whether the protective effects of curcumin against cerebral ischemia injury were due to the suppression of overactivated autophagy. Curcumin is a well-known natural polyphenolic compound that effectively counteracts oxidation, inflammation, and various types of cancer. Several studies have demonstrated the protective effects of curcumin against ischemia-reperfusion injury in tissues from the lungs, cardiomyocytes, and liver. The present study employed brain injury models induced by middle cerebral artery occlusion (MCAO) in rats and PC12 oxygen-glucose-deprived (OGD) cells...
May 7, 2018: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/29777161/genetic-diversity-analysis-reveals-genetic-differentiation-and-strong-population-structure-in-calotropis-plants
#2
Nkatha G Muriira, Alice Muchugi, Anmin Yu, Jianchu Xu, Aizhong Liu
The genus Calotropis (Asclepiadaceae) is comprised of two species, C. gigantea and C. procera, which both show significant economic potential for use of their seed fibers in the textile industry, and of their bioactive compounds as new medicinal resources. The available wild-sourced germplasm contains limited genetic information that restricts further germplasm exploration for the purposes of domestication. We here developed twenty novel EST-SSR markers and applied them to assess genetic diversity, population structure and differentiation within Calotropis...
May 18, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29776930/modifying-the-lantibiotic-mutacin-1140-for-increased-yield-activity-and-stability
#3
Mengxin Geng, Leif Smith
Mutacin 1140 belongs to the epidermin family of type AI lantibiotics. This family has a broad spectrum of activity against Gram-positive bacteria. The binding of mutacin 1140 to lipid II leads to the inhibition of cell wall synthesis. Pharmacokinetic experiments on type AI lantibiotics are generally discouraging for clinical applications due to their short half-life. The unprotected dehydrated and protease susceptible residues outside of the lanthionine rings may play a role in their short half-life in physiological settings...
May 18, 2018: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/29776647/-effect-of-green-alga-ulva-lactuca-polysaccharides-supplementation-on-blood-pressure-and-on-atherogenic-risk-factors-in-rats-fed-a-high-fat-diet
#4
Z I Tair, F Bensalah, F Boukortt
AIM OF THE STUDY: To highlight the benefits of green alga Ulva lactuca polysaccharides supplementation on blood pressure and atherogenic risk factors in rats fed a high fat diet. METHODS: Wistar male rats were fed a high fat diet (30% sheep fat) for 3 months. At an average body weight (BW) of 360g, the rats (n=18) were divided into 3 groups and consumed, for 28 days, either a high fat diet (HFD) or a high fat diet enriched with 1% of whole green algae (WGA) powder or with 1% of its polysaccharides (PLS)...
May 15, 2018: Annales de Cardiologie et D'angéiologie
https://www.readbyqxmd.com/read/29775778/the-genus-cordyceps-an-extensive-review-of-its-traditional-uses-phytochemistry-and-pharmacology
#5
REVIEW
Opeyemi Joshua Olatunji, Jian Tang, Adesola Tola, Florence Auberon, Omolara Oluwaniyi, Zhen Ouyang
The genus Cordyceps has about 750 identified species which are distributed in many regions of the World, but mainly found in South Asia, Europe and North America. The species of the genus are highly priced and are widely used as food and medicine for the treatment of various ailments. This present review compiles literature information on the ethno-medicinal, phytochemistry and pharmacological properties of species in the genus Cordyceps. In addition, the review also suggest recommendations for the future researches...
May 15, 2018: Fitoterapia
https://www.readbyqxmd.com/read/29775727/isolation-structure-elucidation-and-antibacterial-activity-of-methyl-4-8-dimethylundecanate-from-the-marine-actinobacterium-streptomyces-albogriseolus-ecr64
#6
Durairaj Thirumurugan, Ramasamy Vijayakumar, Chithravel Vadivalagan, Pushparaj Karthika, Md Khurshid Alam Khan
Around 120 actinobacterial colonies were isolated from various regions of marine East coast region of Tamil Nadu, India. Among them, 33 were morphologically distinct and they were preliminarily screened for their antibacterial activity against Pseudomonas fluorescens, Vibrio cholerae, V. parahaemolyticus, V. alginolyticus, and Aeromonas hydrophila by cross-streak plate technique. Among the isolated, the isolate ECR64 exhibited maximum zone of inhibition against fish pathogenic bacteria. The crude bioactive compounds were extracted from the isolate ECR64 using different organic solvents which exhibited maximum antibacterial activity...
May 15, 2018: Microbial Pathogenesis
https://www.readbyqxmd.com/read/29775541/molecular-characterization-and-bioactivity-of-coumarin-derivatives-from-the-fruits-of-cucumis-bisexualis
#7
Qin-Ge Ma, Rong-Rui Wei, Ming Yang, Xiao-Ying Huang, Fang Wang, Zhi-Pei Sang, Wen-Min Liu, Qing Yu
Cucumis bisexualis (Cucurbitaceae) is known as "mapao egg" or "muskmelon egg", which has been widely used as a wild melon in Chinese folk. Nine new coumarin derivatives (1-9), named 7-hydroxy-3-(4',6'-dihydroxy-5'-isopropyl-3'',3''-dimethyl-2H-chromen)-6-prenyl-2H-chromen-2-one (1), 7-hydroxy-3-(5'-prenyl-3'',3''-dimethyl-2H-chromen)-6-prenyl-2H-chromen-2-one (2), 3-(6'-hydroxy-5'-prenyl-3'',3''-dimethyl-2H-chromen)-6-prenyl-2H-chromen-2-one (3), 3-(5'-ethyl-3'',3''-dimethyl-2H-chromen)-6-prenyl-2H-chromen-2-one (4), 3-(4',6'-dihydroxy-5'-dimethylallyl-3'',3''-dimethyl-2H-chromen)-6-prenyl-2H-chromen-2-one (5), 3-[4',6'-dihydroxy-5'-(2-propenyl)-3'',3''-dimethyl-2H-chromen]-14,15-dimethyl-pyrano-chromen-2-one (6), 3-(6'-dihydroxy-5'-isopropanol-3'',3''-dimethyl-2H-chromen)-14,15-dimethyl-pyrano-chromen-2-one (7), 3-(5'-isopentenol-3'',3''-dimethyl-2H-chromen)-14,15-dimethyl-pyrano-chromen-2-one (8), 3-(4',6'-dihydroxy-5'-prenyl-3'',3''-dimethyl-2H-chromen)-14,15-dimethyl-pyrano-chromen-2-one (9), together with twelve known compounds (10-21), were isolated and identified by spectroscopic analysis and references from the active site (EtOAc soluble fraction) of the fruits of C...
May 18, 2018: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/29775495/enantioselective-synthesis-of-all-carbon-quaternary-centers-structurally-related-to-amaryllidaceae-alkaloids
#8
Jiří Mikušek, Petr Jansa, Pratap R Jagtap, Tomáš Vašíček, Ivana Císařová, Eliška Matoušová
Enantioselective synthesis of all-carbon quaternary centers remains a considerable challenge for synthetic organic chemists. Here, we report a two-step protocol to synthesize such centers including tandem cyclization/Suzuki cross-coupling followed by halocarbocyclization. During this process, two rings, three new C-C bonds and a stereochemically defined all-carbon quaternary center are formed. The absolute configuration of this center is controlled by the stereochemistry of the adjacent stereocenter, which derives from an appropriate enantioenriched starting material...
May 18, 2018: Chemistry: a European Journal
https://www.readbyqxmd.com/read/29775214/pressurized-hot-water-extraction-of-bioactive-compounds-from-artichoke-by-products
#9
Imma Pagano, Anna Lisa Piccinelli, Rita Celano, Luca Campone, Patrizia Gazzerro, Mariateresa Russo, Luca Rastrelli
Artichoke by-products are a suitable source of health-promoting ingredients for the production of dietary supplements and food additives. A pressurized hot water extraction (PHWE) was developed to recover caffeoylquinic acids (CQAs) and flavone glycosides (FLs) from agro-industrial artichoke by-products. The main factors influencing PHWE efficiency and CQA isomerization (temperature, numbers of cycles, modifier and extraction time) were carefully studied and optimized by response surface design. The proposed PHWE procedure provides an exhaustive extraction of CQAs and FLs (recoveries: 93-105 and 90-105%) from artichoke external bracts and leaves of different cultivars (p > 0...
May 18, 2018: Electrophoresis
https://www.readbyqxmd.com/read/29774913/biosynthesis-of-the-teleocidin-type-terpenoid-indole-alkaloids
#10
REVIEW
Takayoshi Awakawa, Ikuro Abe
Teleocidin B is a terpenoid indole alkaloid with unique structures including indolactam and cyclic terpenoid, and is a strong protein kinase C activator. Its unique structure and bioactivity have drawn vast interest from chemists and biologists, and numerous isolation and bioactivity studies on this molecule have been performed. Recently, its biosynthetic enzymes were identified, and some of their crystal structures were reported. In this review, we describe the isolation of teleocidin derivatives, biosynthetic studies, and detailed analyses of biosynthetic enzymes, to clarify their biosynthetic reactions toward the enzymatic synthesis of bioactive teleocidin compounds...
May 18, 2018: Organic & Biomolecular Chemistry
https://www.readbyqxmd.com/read/29774337/fermentation-alters-the-bioaccessible-phenolic-compounds-and-increases-the-alpha-glucosidase-inhibitory-effects-of-aronia-juice-in-a-dairy-matrix-following-in-vitro-digestion
#11
Xue Du, Angela D Myracle
The prevalence of diabetes reached 415 million worldwide in 2015. Polyphenol-rich food intake can benefit the glycemic control for individuals with diabetes. Fermentation may increase the bioavailability of polyphenols, which is generally low. Aronia (Aronia melanocarpa) is a polyphenol-rich berry that is native to North America. Proanthocyanins and anthocyanins are the major phenolic compounds in aronia. In this study, aronia kefir was made by fermenting cow's milk with added aronia juice. The changes in bioaccessible polyphenols of aronia kefir during digestion were assessed using an in vitro model...
May 18, 2018: Food & Function
https://www.readbyqxmd.com/read/29774137/saudi-anti-human-cancer-plants-database-sacpd-a-collection-of-plants-with-anti-human-cancer-activities
#12
Ateeq Ahmed Al-Zahrani
Several anticancer drugs have been developed from natural products such as plants. Successful experiments in inhibiting the growth of human cancer cell lines using Saudi plants were published over the last three decades. Up to date, there is no Saudi anticancer plants database as a comprehensive source for the interesting data generated from these experiments. Therefore, there was a need for creating a database to collect, organize, search and retrieve such data. As a result, the current paper describes the generation of the Saudi anti-human cancer plants database (SACPD)...
January 30, 2018: Oncology Reviews
https://www.readbyqxmd.com/read/29773786/stereodivergent-synthesis-of-vicinal-quaternary-quaternary-stereocenters-and-bioactive-hyperolactones
#13
Haifeng Zheng, Yan Wang, Chaoran Xu, Xi Xu, Lili Lin, Xiaohua Liu, Xiaoming Feng
Although great success has been achieved in asymmetric Claisen rearrangement for the synthesis of chiral γ,δ-unsaturated carbonyl compounds bearing vicinal tertiary-quaternary stereocenters, the development of asymmetric versions for stereodivergent construction of adjacent quaternary-quaternary stereocenters remains a formidable challenge because of the high steric hindrance. Here we report a catalytic enantioselective dearomatization Claisen rearrangement of allyl furyl ethers catalyzed by chiral N,N'-dioxide-NiII complex catalysts...
May 17, 2018: Nature Communications
https://www.readbyqxmd.com/read/29773063/conversion-of-protein-active-regions-into-peptidomimetic-therapeutic-leads-using-backbone-cyclization-and-cycloscan-how-to-do-it-yourself
#14
Samuel J S Rubin, Yftah Tal-Gan, Chaim Gilon, Nir Qvit
Protein-protein interactions (PPIs) are particularly important for controlling both physiologic and pathologic biological processes but are difficult to target due to their large and/or shallow interaction surfaces unsuitable for small molecules. Linear peptides found in nature interact with some PPIs, and protein active regions can be used to design synthetic peptide compounds for inhibition of PPIs. However, linear peptides are limited therapeutically by poor metabolic and conformational stability, which can compromise their bioactivity and half-life...
May 17, 2018: Current Topics in Medicinal Chemistry
https://www.readbyqxmd.com/read/29773062/backbone-cyclized-peptides-a-critical-review
#15
Samuel J S Rubin, Nir Qvit
Backbone-cyclized peptides and peptidomimetics integrate the biological activity and pharmacological features necessary for successful research tools and therapeutics. In general, these structures demonstrate improved maintenance of bioactive conformation, stability and cell permeability compared to their linear counterparts, while maintaining support for a variety of side chain chemistries. We explain how backbone cyclization and cycloscan techniques allow scientists to cyclize linear peptides with retained or enhanced biological activity and improved drug-like features...
May 17, 2018: Current Topics in Medicinal Chemistry
https://www.readbyqxmd.com/read/29773013/critical-review-on-curcumin-as-a-therapeutic-agent-from-traditional-herbal-medicine-to-an-ideal-therapeutic-agent
#16
Muhammad Usman Akbar, Kanwal Rehman, Khalid Mahmood Zia, Muhammad Imran Qadir, Muhammad Sajid Hamid Akash, Muhammad Ibrahim
Traditionally, many natural medicinal plants have been used to treat a variety of diseases since ancient times and are considered a potential source of phytochemicals for the development of new drugs. One of these is curcumin, which is an easily accessible, inexpensive, and nontoxic bioactive compound. Curcumin is a very important, naturally occurring, and highly lipophilic and phenolic substance derived from the rhizomes of plant Curcuma longa, a member of the Zingiberaceae (ginger) family, which is mostly used as a curry spice, flavoring agent, insect repellent, coloring agent in food, traditional drug, and ingredient in cosmetics...
2018: Critical Reviews in Eukaryotic Gene Expression
https://www.readbyqxmd.com/read/29773009/cloning-and-characterization-of-promoters-of-the-fungal-immunomodulatory-protein-genes-from-ganoderma-spp-agaricomycetes-and-their-response-to-methyl-jasmonate-and-salicylic-acid
#17
Qi-Zhang Li, Yu-Zhou Chang, Kai-Qi Su, Xiao-Lei Wang, Xiao-Hui Bai, Xuan-Wei Zhou
Ganoderma mushrooms for medicinal use contain various bioactive compounds, but the genetic elements available for these medicinal mushrooms are still limited. In this study we cloned and analyzed the promoters of fungal immunomodulatory protein (FIP) genes from G. lucidum and G. atrum. FIP gene expression was induced by different concentrations of methyl jasmonate (MeJA) and salicylic acid (SA), and messenger RNA expression was detected by quantitative reverse-transcription polymerase chain reaction. The results provided 5' upstream sequences of FIP genes from G...
2018: International Journal of Medicinal Mushrooms
https://www.readbyqxmd.com/read/29772795/identification-of-insecticidal-constituents-from-the-essential-oil-from-the-aerial-parts-stachys-riederi-var-japonica
#18
Meirong Quan, Qi Zhi Liu, Zhi Long Liu
The essential oil of Stachys riederi var. japonica (Family: Lamiaceae) was extracted by hydrodistillation and determined by GC and GC-MS. A total of 40 components were identified, representing 96.01% of the total oil composition. The major compounds in the essential oil were acetanisole (15.43%), anisole (9.43%), 1,8-cineole (8.07%), geraniol (7.89%), eugenol (4.54%), caryophyllene oxide (4.47%), caryophyllene (4.21%) and linalool (4.07%). Five active constituents (acetanisole, anisole, 1,8-cineole, eugenol and geraniol) were identified by bioactivity-directed fractionation...
May 17, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29772776/pyrrole-alkaloids-from-the-edible-mushroom-phlebopus-portentosus-with-their-bioactive-activities
#19
Zhaocui Sun, Meigeng Hu, Zhonghao Sun, Nailiang Zhu, Junshan Yang, Guoxu Ma, Xudong Xu
Seven pyrrole alkaloids, three of which are novel (phlebopines A⁻C ( 1 ⁻ 3 )), were isolated from the fruiting bodies of the edible mushroom Phlebopus portentosus . Their structures were determined on the basis of spectroscopic data. All the isolated compounds were tested for their neuroprotective properties and acetylcholine esterase (AChE) inhibition activities. Compound 7 displayed remarkable neuroprotective effects against hydrogen peroxide (H₂O₂)-induced neuronal-cell damage in human neuroblastoma SH-SY5Y cells...
May 17, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29772722/ethnobotany-phytochemistry-and-pharmacological-effects-of-plants-in-genus-cynanchum-linn-asclepiadaceae
#20
REVIEW
Lu Han, Xiuping Zhou, Mengmeng Yang, Li Zhou, Xinxin Deng, Shijie Wei, Wenping Wang, Zhizhong Wang, Xue Qiao, Changcai Bai
Genus Cynanchum L. belongs to the family Asclepiadaceae, which comprise more than 200 species distributed worldwide. In Chinese medical practice, numerous drugs (such as tablets and powders) containing different parts of plants of this genus are used to treat snake bites, bruises, osteoblasts, rheumatoid arthritis and tumors. A search for original articles published on the cynanchum genus was performed by using several resources, including Flora of China Official Website and various scientific databases, such as PubMed, SciFinder, the Web of Science, Science Direct, and China Knowledge Resource Integrated (CNKI)...
May 16, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
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