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https://www.readbyqxmd.com/read/28206772/cytotoxic-fusicoccane-type-diterpenoids-from-streptomyces-violascens-isolated-from-ailuropoda-melanoleuca-feces
#1
Dan Zheng, Li Han, Xiaodan Qu, Xiu Chen, Jialiang Zhong, Xiaoxu Bi, Jiang Liu, Yi Jiang, Chenglin Jiang, Xueshi Huang
Six new fusicoccane-type diterpenoids (2-7) were isolated from the fermentation broth of Streptomyces violascens, which was isolated from Ailuropoda melanoleuca (giant panda) feces. The structures of these new compounds were elucidated by a detailed spectroscopic data and X-ray crystallographic analysis. Compounds 5-7 demonstrated cytotoxicity against five human cancer cell lines, with IC50 values ranging from 3.5 ± 0.7 to 14.1 ± 0.8 μM. Cell adhesion, migration, and invasion assays showed that 6 inhibited the migration and invasion of human hepatocellular carcinoma SMMC7721 cells in a dose-dependent manner...
February 16, 2017: Journal of Natural Products
https://www.readbyqxmd.com/read/28198597/crystallographically-aligned-perovskite-structures-for-high-performance-polarization-sensitive-photodetectors
#2
Jiangang Feng, Xiaoxu Yan, Yun Liu, Hanfei Gao, Yuchen Wu, Bin Su, Lei Jiang
Polarization-sensitive perovskite photodetectors are realized by crystallographically aligning 1D perovskite arrays. High-quality inorganic perovskite single crystals with crystallographic order are fabricated by strictly manipulating the dewetting process of organic solution, yielding photodetectors with high photoresponsivity and fast response speed.
February 15, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28197101/the-combination-of-three-components-derived-from-sheng-maisan-protects-myocardial-ischemic-diseases-and-inhibits-oxidative-stress-via-modulating-mapks-and-jak2-stat3-signaling-pathways-based-on-bioinformatics-approach
#3
Fang Li, Yu Zhang, Donglin Zeng, Yu Xia, Xiaoxue Fan, Yisha Tan, Junping Kou, Boyang Yu
GRS is a drug combination of three components including ginsenoside Rb1, ruscogenin and schisandrin. It derived from the well-known TCM formula Sheng MaiSan, a widely used traditional Chinese medicine for the treatment of cardiovascular diseases in clinic. The present study illuminates its underlying mechanisms against myocardial ischemic diseases based on the combined methods of bioinformatic prediction and experimental verification. A protein database was established through constructing the drug-protein network...
2017: Frontiers in Pharmacology
https://www.readbyqxmd.com/read/28196901/novel-variant-in-the-ank2-membrane-binding-domain-is-associated-with-ankyrin-b-syndrome-and-structural-heart-disease-in-a-first-nations-population-with-a-high-rate-of-long-qt-syndrome
#4
Leigh Anne Swayne, Nathaniel P Murphy, Sirisha Asuri, Lena Chen, Xiaoxue Xu, Sarah McIntosh, Chao Wang, Peter J Lancione, Jason D Roberts, Charles Kerr, Shubhayan Sanatani, Elizabeth Sherwin, Crystal F Kline, Mingjie Zhang, Peter J Mohler, Laura T Arbour
BACKGROUND: Long QT syndrome confers susceptibility to ventricular arrhythmia, predisposing to syncope, seizures, and sudden death. While rare globally, long QT syndrome is ≈15× more common in First Nations of Northern British Columbia largely because of a known mutation in KCNQ1. However, 2 large multigenerational families were affected, but negative for the known mutation. METHODS AND RESULTS: Long QT syndrome panel testing was carried out in the index case of each family, and clinical information was collected...
January 2017: Circulation. Cardiovascular Genetics
https://www.readbyqxmd.com/read/28192748/exposure-to-pm2-5-induces-aberrant-activation-of-nf-%C3%AE%C2%BAb-in-human-airway-epithelial-cells-by-downregulating-mir-331-expression
#5
Lei Song, Dan Li, Xiaoping Li, Lianjun Ma, Xiaoxue Bai, Zhongmei Wen, Xiufang Zhang, Dong Chen, Liping Peng
Exposure to particulate matter (PM) with an aerodynamic diameter≤2.5μm (PM2.5) induces reactive oxygen species (ROS) and pro-inflammatory cytokine production, leading to airway epithelial injury. However, the mechanisms underlying the toxicity of PM2.5 have not been clarified. Here, we show that exposure to PM2.5 induces sustained activation of the nuclear factor kappa B (NF-κB) signaling in human airway epithelial Beas-2B (B2B) cells. In addition, PM2.5 exposure significantly decreased miR-331 expression in B2B cells, which was abrogated by inhibition of ROS or phosphoinositide 3-kinase (PI3K)/Akt pathway...
February 6, 2017: Environmental Toxicology and Pharmacology
https://www.readbyqxmd.com/read/28176286/aptamer-combined-with-fluorescent-silica-nanoparticles-for-detection-of-hepatoma-cells
#6
Zixi Hu, Juntao Tan, Zongqiang Lai, Rong Zheng, Jianhong Zhong, Yiwei Wang, Xiaoxue Li, Nuo Yang, Jieping Li, Wei Yang, Yong Huang, Yongxiang Zhao, Xiaoling Lu
PURPOSE: The purpose of this study is to develop a simple, effective method to label hepatoma cells with aptamers and then detect them using fluorescent silica nanoparticles (FSNPs). METHOD: Streptavidin was conjugated to carboxyl-modified fluorescein isothiocyanate (FITC)-doped silica nanoparticles which were prepared by the reverse microemulsion method. The resulting streptavidin-conjugated fluorescent silica nanoparticles (SA-FSNPs) were mixed with hepatoma cells that had been labeled with biotin-conjugated aptamer TLS11a (Bio-TLS11a)...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28164660/independent-association-between-hyperuricemia-and-histopathological-parameters-in-chinese-patients-with-hen%C3%A3-ch-sch%C3%A3-nlein-purpura-nephritis
#7
Shan Lu, Dong Liu, Jing Xiao, Genyang Cheng, Xiaoyang Wang, Xiaoxue Zhang, Wenming Yuan, Yanna Dou, Zhangsuo Liu, Zhanzheng Zhao
BACKGROUND: This study aimed to investigate the role of hyperuricemia in the development of histopathological changes in HSPN. METHODS: Clinical and laboratory data pertaining to 139 adult HSPN patients with and without elevated serum uric acid levels were retrospectively evaluated. There was a 14.4% prevalence of hyperuricemia in patients with HSPN. RESULTS: Patients with hyperuricemia had higher levels of cystatin C and urine β2-microglobulin and lower levels of HDL-C in comparison to that in patients with normal serum uric acid levels (p < 0...
November 1, 2016: Clinical Laboratory
https://www.readbyqxmd.com/read/28160453/word-learning-mechanisms
#8
REVIEW
Angela Xiaoxue He, Sudha Arunachalam
How do children acquire the meanings of words? Many word learning mechanisms have been proposed to guide learners through this challenging task. Despite the availability of rich information in the learner's linguistic and extralinguistic input, the word-learning task is insurmountable without such mechanisms for filtering through and utilizing that information. Different kinds of words, such as nouns denoting object concepts and verbs denoting event concepts, require to some extent different kinds of information and, therefore, access to different kinds of mechanisms...
February 3, 2017: Wiley Interdisciplinary Reviews. Cognitive Science
https://www.readbyqxmd.com/read/28158118/design-and-optimization-for-main-support-structure-of-a-large-area-off-axis-three-mirror-space-camera
#9
Lei Wei, Lei Zhang, Xiaoxue Gong, Dong-Mei Ma
To ensure excellent dynamic and static performance of large-area, off-axis three-mirror anastigmat (TMA)-space cameras, and to realize a lighter weight for the entire system, a truss support structure design is applied in this study. In contrast to traditional methods, this paper adopts topology optimization based on the solid isotropic materials with penalization method on the truss structure design. Through reasonable object function and constraint choice, optimal topology results that have concerned the effect of gravity in the X, Y, and Z axis are achieved...
February 1, 2017: Applied Optics
https://www.readbyqxmd.com/read/28158008/independently-tunable-dual-band-plasmonically-induced-transparency-based-on-hybrid-metal-graphene-metamaterials-at-mid-infrared-frequencies
#10
Chen Sun, Zhewei Dong, Jiangnan Si, Xiaoxu Deng
A tunable dual-band plasmonically induced transparency (PIT) device based on hybrid metal-graphene nanostructures is proposed theoretically and numerically at mid-infrared frequencies, which is composed of two kinds of gold dolmen-like structures with different sizes placed on separate graphene interdigitated finger sets respectively. The coupled Lorentz oscillator model is used to explain the physical mechanism of the PIT effect at multiple frequency domains. The finite-difference time-domain (FDTD) solutions are employed to simulate the characteristics of the hybrid metal-graphene dual-band PIT device...
January 23, 2017: Optics Express
https://www.readbyqxmd.com/read/28141833/anthropogenically-driven-environmental-changes-shift-the-ecological-dynamics-of-hemorrhagic-fever-with-renal-syndrome
#11
Huaiyu Tian, Pengbo Yu, Ottar N Bjørnstad, Bernard Cazelles, Jing Yang, Hua Tan, Shanqian Huang, Yujun Cui, Lu Dong, Chaofeng Ma, Changan Ma, Sen Zhou, Marko Laine, Xiaoxu Wu, Yanyun Zhang, Jingjun Wang, Ruifu Yang, Nils Chr Stenseth, Bing Xu
Zoonoses are increasingly recognized as an important burden on global public health in the 21st century. High-resolution, long-term field studies are critical for assessing both the baseline and future risk scenarios in a world of rapid changes. We have used a three-decade-long field study on hantavirus, a rodent-borne zoonotic pathogen distributed worldwide, coupled with epidemiological data from an endemic area of China, and show that the shift in the ecological dynamics of Hantaan virus was closely linked to environmental fluctuations at the human-wildlife interface...
January 2017: PLoS Pathogens
https://www.readbyqxmd.com/read/28132498/increasing-malonyl-coa-derived-product-through-controlling-the-transcription-regulators-of-phospholipid-synthesis-in-saccharomyces-cerevisiae
#12
Xiaoxu Chen, Xiaoyu Yang, Yu Shen, Jin Hou, Xiaoming Bao
Malonyl-CoA is a precursor of a variety of compounds such as polyketides and flavonoids. In Saccharomyces cerevisiae, malonyl-CoA concentration is tightly regulated and therefore maintained at a very low level, limiting the production of malonyl-CoA-derived chemicals. Here we manipulated the phospholipid synthesis transcriptional regulators to control the malonyl-CoA levels and increase the downstream product. Through manipulating different regulators including Ino2p, Ino4p, Opi1p, and a series of synthetic Ino2p variants, combining with studying the inositol and choline effect, the engineered strain achieved a 9-fold increase of the titer of malonyl-CoA-derived product 3-hydroxypropionic acid, which is among the highest improvement relative to previously reported strategies...
January 29, 2017: ACS Synthetic Biology
https://www.readbyqxmd.com/read/28132024/mosaichunter-accurate-detection-of-postzygotic-single-nucleotide-mosaicism-through-next-generation-sequencing-of-unpaired-trio-and-paired-samples
#13
August Yue Huang, Zheng Zhang, Adam Yongxin Ye, Yanmei Dou, Linlin Yan, Xiaoxu Yang, Yuehua Zhang, Liping Wei
Genomic mosaicism arising from postzygotic mutations has long been associated with cancer and more recently with non-cancer diseases. It has also been detected in healthy individuals including healthy parents of children affected with genetic disorders, highlighting its critical role in the origin of genetic mutations. However, most existing software for the genome-wide identification of single-nucleotide mosaicisms (SNMs) requires a paired control tissue obtained from the same individual which is often unavailable for non-cancer individuals and sometimes missing in cancer studies...
January 27, 2017: Nucleic Acids Research
https://www.readbyqxmd.com/read/28130994/enhanced-photoelectrochemical-immunosensing-of-cardiac-troponin-i-based-on-energy-transfer-between-n-acetyl-l-cysteine-capped-cdagte-quantum-dots-and-dodecahedral-au-nanoparticles
#14
Yuan Tan, Yanying Wang, Mingshi Li, Xiaoxue Ye, Tsunghsueh Wu, Chunya Li
An immunosensor was fabricated with an immobilized antibody for cardiac troponin I (anti-cTnI) on a photoresponsive composite material consisting of N-acetyl-L-cysteine capped CdAgTe quantum dots (NAC-CdAgTe QDs) and dodecahedral gold nanoparticles (AuNPs) stabilized by 1-(10-bromodecyl)-3-methylimidazolium bromide ionic liquid. Synthesized materials were characterized by TEM, SEM, UV-Vis, XRD, XPS, EIS, fluorescence, and photoelectrochemical method to confirm their morphology, elemental composition, and properties...
January 20, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28129433/celastrol-ameliorates-cd-induced-neuronal-apoptosis-by-targeting-nox2-derived-ros-dependent-pp5-jnk-signaling-pathway
#15
Chong Xu, Xiaoxue Wang, Chenjian Gu, Hai Zhang, Ruijie Zhang, Xiaoqing Dong, Chunxiao Liu, Xiaoyu Hu, Xiang Ji, Shile Huang, Long Chen
Celastrol, a plant-derived triterpene, has neuroprotective benefit in the models of neurodegenerative disorders that are characterized by overproduction of reactive oxygen species (ROS). Recently, we have reported that cadmium (Cd) activates c-Jun N-terminal kinase (JNK) pathway leading to neuronal cell death by inducing ROS inactivation of protein phosphatase 5 (PP5), and celastrol prevents Cd-activated JNK pathway against neuronal apoptosis. Therefore, we hypothesized that celastrol could hinder Cd induction of ROS-dependent PP5-JNK signaling pathway from apoptosis in neuronal cells...
January 27, 2017: Journal of Neurochemistry
https://www.readbyqxmd.com/read/28125037/therapeutic-effect-of-cistanoside-a-on-bone-metabolism-of-ovariectomized-mice
#16
Xiaoxue Xu, Zhuanzhuan Zhang, Wenping Wang, Huiqin Yao, Xueqin Ma
Cistanoside A (Cis A), an active phenylethanoid glycoside isolated from Cistanche deserticola Y. C. Ma, has received our attention because of its possible role in the treatment of osteoporosis. In the present study, we evaluated the effects of Cis A on an ovariectomized (OVX) mice model and investigated its underlying molecular mechanisms of action. After 12 weeks of orally-administrated intervention, Cis A (20, 40 and 80 mg/kg body weight/day) exhibited significant antiosteoporotic effects on OVX mice, evidenced by enhanced bone strength, bone mineral density and improved trabecular bone microarchitecture...
January 24, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28120998/silver-mediated-radical-coupling-reaction-of-isocyanides-and-alcohols-phenols-in-the-presence-of-water-unprecedented-hydration-and-radical-coupling-reaction-sequence
#17
Lin Zhang, Pin Xiao, Xiaoxue Guan, Zhouliang Huang, Jingping Zhang, Xihe Bi
The radical coupling of isocyanides and alcohols/phenols promoted by silver in the presence of water is reported for the first time, which led to the formation of diverse carbamates. In contrast to the well-known 1,1-addition to form imidoyl radicals, a novel reaction mechanism, involving sequential hydration of isocyanides and coupling with alkoxyl/phenoxyl radicals, is disclosed by combining experimental and theoretical studies.
January 25, 2017: Organic & Biomolecular Chemistry
https://www.readbyqxmd.com/read/28120937/single-basal-application-of-thiacloprid-for-the-integrated-management-of-meloidogyne-incognita-and-bemisia-tabaci-in-tomato-crops
#18
Sa Dong, Xiaofen Ren, Dianli Zhang, Xiaoxue Ji, Kaiyun Wang, Kang Qiao
Tomato growers commonly face heavy nematode (Meloidogyne incognita) and whitefly (B-biotype Bemisia tabaci) infestations, and previous studies demonstrated that thiacloprid could be used to control M. incognita and B. tabaci in cucumber. However, the efficacy of a single basal application of thiacloprid to control both pests and its effect on yield in tomato remains unknown. In this study, the potential of thiacloprid application to the soil for the integrated control of M. incognita and B. tabaci in tomato was evaluated in the laboratory and the field...
January 25, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28114995/prognostic-and-therapeutic-value-of-disruptor-of-telomeric-silencing-1-like-dot1l-expression-in-patients-with-ovarian-cancer
#19
Xiaoxue Zhang, Dan Liu, Mengchen Li, Canhui Cao, Dongyi Wan, Bixin Xi, Wenqian Li, Jiahong Tan, Ji Wang, Zhongcai Wu, Ding Ma, Qinglei Gao
BACKGROUND: Epigenetics has been known to play a critical role in regulating the malignant phenotype. This study was designed to examine the expression of DOT1L (histone 3 lysine 79 methyltransferase) and H3K79 methylation in normal ovarian tissues and ovarian tumors and to explore the function of DOT1L and its underline mechanisms in ovarian cancer. METHODS: The expression of DOT1L and H3K79 methylation in 250 ovarian tumor samples and 24 normal ovarian samples was assessed by immunohistochemistry...
January 23, 2017: Journal of Hematology & Oncology
https://www.readbyqxmd.com/read/28112926/chemical-stabilization-of-1t-phase-transition-metal-dichalcogenides-with-giant-optical-kerr-nonlinearity
#20
Sherman J R Tan, Ibrahim Abdelwahab, Zijing Ding, Xiaoxu Zhao, Tieshan Yang, Gabriel Z J Loke, Han Lin, Ivan Verzhbitskiy, Sock Mui Poh, Hai Xu, Chang Tai Nai, Wu Zhou, Goki Eda, Baohua Jia, Kian Ping Loh
The 2H-to-1T' phase transition in transition metal dichalcogenides (TMDs) has been exploited to phase-engineer TMDs for applications in which the metallicity of the 1T' phase is beneficial. However, phase-engineered 1T'-TMDs are metastable; thus, stabilization of the 1T' phase remains an important challenge to overcome before its properties can be exploited. Herein, we performed a systematic study of the 2H-to-1T' phase evolution by lithiation in ultrahigh vacuum. We discovered that by hydrogenating the intercalated Li to form lithium hydride (LiH), unprecedented long-term (>3 months) air stability of the 1T' phase can be achieved...
February 3, 2017: Journal of the American Chemical Society
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