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https://www.readbyqxmd.com/read/29166725/-effect-and-related-mechanism-of-mirna-21-on-hydrogen-peroxide-induced-c-kit-cardiac-stem-cells-apoptosis
#1
R Z Zhao, Y Wang, W W Deng, B Shi, X P Long, Z L Wang, W M Chen
Objective: To explored the effect and related mechanism of miRNA-21 on hydrogen peroxide-induced C-kit(+) cardiac stem cells apoptosis. Methods: C-kit(+) cardiac stem cells were isolated from SD rats by the methods of enzyme digestion and magnetic bead. Cells were divided into the following experimental groups: (1) negative control mimics (NCM)group: cells were transfected with negative control miRNA-21 mimics for 48 hours; (2)mimics group: cells were transfected with miRNA-21 mimics for 48 hours; (3) NCM+ H(2)O(2) group: negative control miRNA-21 mimics were transfected into cells for 48 hours and then treated with 100 μmol H(2)O(2) for 2 hours; (4)mimics+ H(2)O(2) group: miRNA-21 mimics were transfected into cells for 48 hours and then treated with 100 μmol H(2)O(2) for 2 hours...
November 24, 2017: Zhonghua Xin Xue Guan Bing za Zhi
https://www.readbyqxmd.com/read/29166608/s-nitrosylation-of-pink1-attenuates-pink1-parkin-dependent-mitophagy-in-hipsc-based-parkinson-s-disease-models
#2
Chang-Ki Oh, Abdullah Sultan, Joseph Platzer, Nima Dolatabadi, Frank Soldner, Daniel B McClatchy, Jolene K Diedrich, John R Yates, Rajesh Ambasudhan, Tomohiro Nakamura, Rudolf Jaenisch, Stuart A Lipton
Mutations in PARK6 (PINK1) and PARK2 (Parkin) are linked to rare familial cases of Parkinson's disease (PD). Mutations in these genes result in pathological dysregulation of mitophagy, contributing to neurodegeneration. Here, we report that environmental factors causing a specific posttranslational modification on PINK1 can mimic these genetic mutations. We describe a molecular mechanism for impairment of mitophagy via formation of S-nitrosylated PINK1 (SNO-PINK1). Mitochondrial insults simulating age- or environmental-related stress lead to increased SNO-PINK1, inhibiting its kinase activity...
November 21, 2017: Cell Reports
https://www.readbyqxmd.com/read/29166152/is-plant-fitness-proportional-to-seed-set-an-experiment-and-a-spatial-model
#3
Diane R Campbell, Alison K Brody, Mary V Price, Nickolas M Waser, George Aldridge
Individual differences in fecundity often serve as proxies for differences in overall fitness, especially when it is difficult to track the fate of an individual's offspring to reproductive maturity. Using fecundity may be biased, however, if density-dependent interactions between siblings affect survival and reproduction of offspring from high- and low-fecundity parents differently. To test for such density-dependent effects in plants, we sowed seeds of the wildflower Ipomopsis aggregata (scarlet gilia) to mimic partially overlapping seed shadows of pairs of plants, one of which produced twice as many seeds...
December 2017: American Naturalist
https://www.readbyqxmd.com/read/29165991/ultra-stretchable-graphene-based-molecular-barriers-for-chemical-protection-detection-and-actuation
#4
Po-Yen Chen, Mengke Zhang, Muchun Liu, Ian Y Wong, Robert H Hurt
A wide range of technologies require barrier films to impede molecular transport between the external environment and a desired internal microclimate. Adding stretchability to barrier films would enable new applications in packaging, textiles, and flexible devices, but classical barrier materials utilized dense, ordered molecular architectures that easily fracture under small tensile strain. Here, we show that textured graphene-based coatings can serve as ultra-stretchable molecular barriers expandable to 1500% areal strain through programmed unfolding that mimics the elasticity of polymers...
November 22, 2017: ACS Nano
https://www.readbyqxmd.com/read/29165987/hierarchical-self-assembly-of-a-porphyrin-into-chiral-macroscopic-flowers-with-superhydrophobic-and-enantioselective-property
#5
Hejin Jiang, Li Zhang, Jie Chen, Minghua Liu
Supramolecular self-assembly provides an efficient way to fabricate simple units into various hierarchical nano/microstructures, which could mimic the bio-self-assembly and develop functional materials. Since chiral molecules and chiral nanostructures are widely adopted by biological systems, an introduction of the chiral factor into the self-assembly process will provide better understanding of the biological systems. Here, using a chiral amphiphilic histidine to assist the self-assembly of a porphyrin with four carboxylic acids, we obtained hierarchical chiral nano to micro structures...
November 22, 2017: ACS Nano
https://www.readbyqxmd.com/read/29165704/involvement-of-def-1-mutation-in-the-response-of-tomato-plants-to-arbuscular-mycorrhizal-symbiosis-under-well-watered-and-drought-conditions
#6
Beatriz Sánchez-Romera, Mónica Calvo-Polanco, Juan Manuel Ruiz-Lozano, Ángel María Zamarreño, Vicent Arbona, Jose María García-Mina, Aurelio Gómez-Cadenas, Ricardo Aroca
Jasmonic acid (JA) and arbuscular mycorrhizal (AM) symbioses are known to protect plants against abiotic and biotic stresses, but are also involved in the regulation of root hydraulic conductance (L). The objective of this experiment was to elucidate the role of JA in the water relations and hormonal regulation of AM plants under drought by using tomato plants defective in the synthesis of JA (def-1). Our results showed that JA is involved in the uptake and transport of water through its effect on both physiological parameters (stomatal conductance and L), and molecular parameters, mainly by controlling the expression and abundance of aquaporins...
November 20, 2017: Plant & Cell Physiology
https://www.readbyqxmd.com/read/29165645/down-regulation-of-mir-378a-3p-induces-decidual-cell-apoptosis-a-possible-mechanism-for-early-pregnancy-loss
#7
Lihua Hong, Tiantian Yu, Haiyan Xu, Ningning Hou, Qi Cheng, Lihua Lai, Qingqing Wang, Jianzhong Sheng, Hefeng Huang
STUDY QUESTION: Do microRNAs (miRNAs) contribute to human early pregnancy loss (EPL)? SUMMARY ANSWER: miR-378a-3p expression is regulated by progesterone and is down-regulated in ducidua of EPL patients which may contribute to decidual apoptosis through Caspase-3 activation. WHAT IS KNOWN ALREADY: A variety of miRNAs have been demonstrated to be associated with the development of decidualization and placental formation. However, little has been reported on the roles of miRNA in the pathogenesis of EPL...
November 18, 2017: Human Reproduction
https://www.readbyqxmd.com/read/29165614/long-term-health-in-recipients-of-transplanted-in-vitro-propagated-spermatogonial-stem-cells
#8
Callista L Mulder, Lisa A E Catsburg, Yi Zheng, Cindy M de Winter-Korver, Saskia K M van Daalen, Madelon van Wely, Steven Pals, Sjoerd Repping, Ans M M van Pelt
STUDY QUESTION: Is testicular transplantation of in vitro propagated spermatogonial stem cells associated with increased cancer incidence and decreased survival rates in recipient mice? SUMMARY ANSWER: Cancer incidence was not increased and long-term survival rate was not altered after transplantation of in vitro propagated murine spermatogonial stem cells (SSCs) in busulfan-treated recipients as compared to non-transplanted busulfan-treated controls. WHAT IS KNOWN ALREADY: Spermatogonial stem cell autotransplantation (SSCT) is a promising experimental reproductive technique currently under development to restore fertility in male childhood cancer survivors...
November 18, 2017: Human Reproduction
https://www.readbyqxmd.com/read/29165491/fe3o4-aunps-anchored-2d-metal-organic-framework-nanosheets-with-dna-regulated-switchable-peroxidase-like-activity
#9
Bing Tan, Huimin Zhao, Weihao Wu, Xuan Liu, Yaobin Zhang, Xie Quan
Two-dimensional (2D) metal-organic framework (MOF) nanosheets emerging as a new member of the 2D family have received significant research interest in recent years. Herein, we have successfully synthesized 2D copper-based MOF nanosheets with bimetallic anchorage using a facile two-step process at room temperature and ambient pressure, denoted as Cu(HBTC)-1/Fe3O4-AuNPs nanosheets. The as-synthesized 2D bimetallic MOF nanosheets displayed enhanced peroxidase-like activity with relatively high catalytic velocity and affinity for substrates compared with previously reported peroxidase mimics...
November 22, 2017: Nanoscale
https://www.readbyqxmd.com/read/29165488/rocket-inspired-tubular-catalytic-microjets-with-grating-structured-walls-as-guiding-empennages
#10
Gaoshan Huang, Jiyuan Wang, Zhaoqian Liu, Dekai Zhou, Ziao Tian, Borui Xu, Longqiu Li, Yongfeng Mei
Controllable locomotion in the micro-/nanoscale is challenging and attracts increasing research interest. Tubular microjets self-propelled by microbubbles are intensively investigated due to their high energy conversion efficiency, but the imperfection of the tubular geometry makes it harder to realize linear motion. Inspired by the macro rocket, we designed a tubular microjet with a grating-structured wall which mimics the guiding empennage of the macro rocket, and we found that the fluid can be effectively guided by the grooves...
November 22, 2017: Nanoscale
https://www.readbyqxmd.com/read/29165366/nitroxides-as-antioxidants-and-anticancer-drugs
#11
REVIEW
Marcin Lewandowski, Krzysztof Gwozdzinski
Nitroxides are stable free radicals that contain a nitroxyl group with an unpaired electron. In this paper, we present the properties and application of nitroxides as antioxidants and anticancer drugs. The mostly used nitroxides in biology and medicine are a group of heterocyclic nitroxide derivatives of piperidine, pyrroline and pyrrolidine. The antioxidant action of nitroxides is associated with their redox cycle. Nitroxides, unlike other antioxidants, are characterized by a catalytic mechanism of action associated with a single electron oxidation and reduction reaction...
November 22, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29165314/towards-natural-mimetics-of-metformin-and-rapamycin
#12
Alexander Aliper, Leslie Jellen, Franco Cortese, Artem Artemov, Darla Karpinsky-Semper, Alexey Moskalev, Andrew G Swick, Alex Zhavoronkov
Aging is now at the forefront of major challenges faced globally, creating an immediate need for safe, widescale interventions to reduce the burden of chronic disease and extend human healthspan. Metformin and rapamycin are two FDA-approved mTOR inhibitors proposed for this purpose, exhibiting significant anti-cancer and anti-aging properties beyond their current clinical applications. However, each faces issues with approval for off-label, prophylactic use due to adverse effects. Here, we initiate an effort to identify nutraceuticals-safer, naturally-occurring compounds-that mimic the anti-aging effects of metformin and rapamycin without adverse effects...
November 15, 2017: Aging
https://www.readbyqxmd.com/read/29164804/biomaterials-and-advanced-technologies-for-hemostatic-management-of-bleeding
#13
REVIEW
DaShawn A Hickman, Christa L Pawlowski, Ujjal D S Sekhon, Joyann Marks, Anirban Sen Gupta
Bleeding complications arising from trauma, surgery, and as congenital, disease-associated, or drug-induced blood disorders can cause significant morbidities and mortalities in civilian and military populations. Therefore, stoppage of bleeding (hemostasis) is of paramount clinical significance in prophylactic, surgical, and emergency scenarios. For externally accessible injuries, a variety of natural and synthetic biomaterials have undergone robust research, leading to hemostatic technologies including glues, bandages, tamponades, tourniquets, dressings, and procoagulant powders...
November 22, 2017: Advanced Materials
https://www.readbyqxmd.com/read/29164589/mir-214-protects-mc3t3-e1-osteoblasts-against-h2o2-induced-apoptosis-by-suppressing-oxidative-stress-and-targeting-atf4
#14
X-Z Lu, Z-H Yang, H-J Zhang, L-L Zhu, X-L Mao, Y Yuan
OBJECTIVE: Fragility fracture is one of the common complications of osteoporosis. Elevated oxidative stress-induced apoptosis is thought to be one of the unfavorable factors to osteoblastic dysfunction, which increased the risk of bone fracture. However, the molecular mechanisms for oxidative stress-induced osteoblast cells apoptosis still need to be elucidated. This study aims to investigate the protective function of miR-214 in H2O2-induced apoptosis of MC3T3-E1 osteoblasts. MATERIALS AND METHODS: MC3T3-E1 cells were treated with 400 μM H2O2...
November 2017: European Review for Medical and Pharmacological Sciences
https://www.readbyqxmd.com/read/29164582/mir-15a-5p-suppresses-endometrial-cancer-cell-growth-via-wnt-%C3%AE-catenin-signaling-pathway-by-inhibiting-wnt3a
#15
Z-M Wang, X-H Wan, G-Y Sang, J-D Zhao, Q-Y Zhu, D-M Wang
OBJECTIVE: Endometrial cancer is one of the three most common types of gynecologic cancer. The global incidence has increased in recent years. microRNAs (miRNAs) regulate numerous biological processes by binding to the 3'UTR of target mRNA to down-regulate protein synthesis. PATIENTS AND METHODS: Endometrial cancer patients received surgeries in our hospital were enrolled. MiR-15a-5p mimic or miR-15a-5p inhibitor was transfected into HEC-1-A cells by lentivirus...
November 2017: European Review for Medical and Pharmacological Sciences
https://www.readbyqxmd.com/read/29164581/microrna-30c-suppressed-giant-cell-tumor-of-bone-cell-metastasis-and-growth-via-targeting-hoxa1
#16
L-Y Ni, J-D Zhao, Y-H Lu, W Li, B-L Li, X-C Wang, Q-G Meng
OBJECTIVE: To dissect the functioning mode of miR-30c on giant cell tumor of bone cell metastasis and growth and provide therapeutic targets for giant cell tumor of bone. PATIENTS AND METHODS: By quantitative Real-time polymerase chain reaction (qRT-PCR), miR-30c expression level in 62 pairs of giant cell tumor of bone cells tissue samples and five breast cancer-derived cell lines. Using miR-30c mimics and inhibitors, we analyzed the effects of miR-30c over-expression and knockdown on cell proliferation, invasion, and migration...
November 2017: European Review for Medical and Pharmacological Sciences
https://www.readbyqxmd.com/read/29164580/mir-564-inhibited-metastasis-and-proliferation-of-prostate-cancer-by-targeting-mllt3
#17
F-J Meng, F-M Meng, H-X Wu, X-F Cao
OBJECTIVE: MiR-564 has been discovered to be abnormally expressed in human malignancy. Two recent studies suggested that miR-564 plays a role in tumor inhibition in both lung and breast cancer. However, no evidence reported the mechanism and function of miR-564 in prostate cancer (PCa). PATIENTS AND METHODS: The PCa tissues and their adjacent normal tissues were collected from 50 PCa patients. Expressions of miR-564 in tissues and cells were evaluated with RT-qPCR...
November 2017: European Review for Medical and Pharmacological Sciences
https://www.readbyqxmd.com/read/29164577/mir-150-alleviates-emt-and-cell-invasion-of-colorectal-cancer-through-targeting-gli1
#18
H Fan, X Liu, W-W Zheng, Z-H Zhuang, C-D Wang
OBJECTIVE: Epithelial-mesenchymal transition (EMT) is related to colorectal cancer invasion and metastasis. Glioma-associated oncogene homolog 1 (Gli1) abnormal expression is associated with EMT, invasion, and metastasis in various cancers. MiR-150 is found downregulated in colorectal cancer pathogenesis. Bioinformatics analysis shows the complementary targeted relationship between miR-150 and the 3'-UTR of Gli1 mRNA. This study explores the role of miR-150 in regulating Gli1 expression, colorectal cancer cell EMT, and invasion...
November 2017: European Review for Medical and Pharmacological Sciences
https://www.readbyqxmd.com/read/29164337/changes-in-the-midgut-cells-in-the-european-cave-spider-meta-menardi-during-starvation-in-spring-and-autumn
#19
Saška Lipovšek, Gerd Leitinger, Tone Novak, Franc Janžekovič, Szymon Gorgoń, Karolina Kamińska, Magdalena Rost-Roszkowska
During the growth period, in surface habitats, spiders catch enough prey to feed normally. In contrast, in the cave entrance zone, prey may be relatively scarce. Meta menardi inhabits this cave section, resulting in temporary starvation. We studied structural changes in the midgut epithelial cells of M. menardi during a short-term and a medium-term controlled starvation to mimic the occasional starvation in caves, during spring and autumn. Digestive cells, secretory cells and adipocytes were examined before the experimental starvation, in the middle and at the end of starvation...
November 22, 2017: Histochemistry and Cell Biology
https://www.readbyqxmd.com/read/29164188/facile-immobilization-of-dna-using-an-enzymatic-his-tag-mimic
#20
Pascal Röthlisberger, Fabienne Levi-Acobas, Ivo Sarac, Bruno Baron, Patrick England, Philippe Marlière, Piet Herdewijn, Marcel Hollenstein
Methods for immobilization of DNA on solid supports are in high demand. Herein, we present a generally applicable enzymatic method for the immobilization of DNA without any prior chemical derivatization. This strategy relies on the homopolymerization of the modified triphosphate dImTP by the TdT. The resulting enzymatic his-tag mimic ensures binding of DNA on Ni-NTA agarose. The usefulness of this method is highlighted by the immobilization of functional nucleic acids without impairing their specific activities...
November 22, 2017: Chemical Communications: Chem Comm
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