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Microrna metal

Caixia Niu, Quanwei Song, Gen He, Na Na, Jin Ouyang
Optical antennas with anisotropic metal nanostructures are widely used in the field of fluorescence enhancement based on localized surface plasmons (LSPs). They overcome the intrinsic defects of low brightness of near-infrared (NIR) dyes and can be used to develop sensitive NIR sensors for bioapplications. Here, we demonstrate a novel NIR plasmon-enhanced fluorescence (PEF) system consisting of elongated gold nanobipyramids (Au NBPs) antennas, silica, and NIR dyes. Silica was chosen as the rigid spacer to regulate the distance between the metal nanostructures and dyes...
October 13, 2016: Analytical Chemistry
Aruo Nan, Lijian Chen, Nan Zhang, Zhenzhong Liu, Ti Yang, Zhishan Wang, Chengfeng Yang, Yiguo Jiang
Lead is a metal that has toxic effects on the developing nervous system. However, the mechanisms underlying lead-induced neurotoxicity are not well understood. Non-coding RNAs (ncRNAs) play an important role in epigenetic regulation, but few studies have examined the function of ncRNAs in lead-induced neurotoxicity. We addressed this in the present study by evaluating the functions of a long non-coding RNA (named lncRpa) and a circular RNA (named circRar1) in a mouse model of lead-induced neurotoxicity. High-throughput RNA sequencing showed that both lncRpa and circRar1 promoted neuronal apoptosis...
September 7, 2016: Archives of Toxicology
Changyu Zhou, Jiayu Li, Jiarui Li, Yingchun Wan, Tao Li, Piyong Ma, Yingjian Wang, Haiyan Sang
The aim of the present study was to identify the differentially expressed microRNAs (DEMs) between Lynch syndrome (LS) and the normal colonic (N-C) control samples, predict the target genes (TGs) and analyze the potential functions of the DEMs and TGs. The miRNA expression dataset GSE30454, which included data of 13 LS and 20 N-C tissue samples, was downloaded from the Gene Expression Omnibus. The classical t-test in Linear Models for Microarray Data package was used for DEM identification. TG prediction was performed using 5 databases...
September 2016: Oncology Letters
Sofia Pavanello, Matteo Bonzini, Laura Angelici, Valeria Motta, Laura Pergoli, Mirjam Hoxha, Laura Cantone, Angela Cecilia Pesatori, Pietro Apostoli, Armando Tripodi, Andrea Baccarelli, Valentina Bollati
BACKGROUND: Continuous exposure to particulate air pollution (PM) is a serious worldwide threat to public health as it coherently links with increased morbidity and mortality of cardiorespiratory diseases (CRD), and of type 2 diabetes (T2D). Extracellular vesicles (EVs) are circular plasma membrane fragments released from human cells that transfer microRNAs between tissues. In the present work it was explored the hypothesis that EVs with their encapsulated microRNAs (EVmiRNAs) contents might mediate PM effects by triggering key pathways in CRD and T2D...
September 30, 2016: Toxicology Letters
Diego La Mendola, Chiara Giacomelli, Enrico Rizzarelli
The description of the cell life needs not only the knowledge of its genome and proteome, but also of the location of the metal ions and their different complex species in the subcellular compartments, that is of metallome. The cross-talk among these players of the omics' world secures the cellular homeostasis by means of a complex network, the alteration of which may give rise to many diseases. Copper and zinc ions levels regulate protein expression and metal-responsive transcription factors and in many pathologies metal dyshomeostasis induces to aberrant expression of different factors...
July 15, 2016: Current Topics in Medicinal Chemistry
Laura Arribas-Hernández, Antonin Marchais, Christian Poulsen, Bettina Haase, Judith Hauptmann, Vladimir Benes, Gunter Meister, Peter Brodersen
ARGONAUTE1 (AGO1) mediates posttranscriptional silencing by microRNAs (miRNAs) and short interfering RNAS (siRNAs). AGO1-catalyzed RNA cleavage (slicing) represses miRNA targets, but current models also highlight the roles of slicing in formation of siRNAs and siRNA-AGO1 complexes. miRNA-guided slicing is required for biogenesis of phased, trans-acting siRNAs (tasiRNAs), whose cleaved precursor fragments are converted to double-stranded RNA by RNA-dependent RNA polymerase 6 (RDR6). In addition, unwinding of duplex siRNA bound to AGO1 requires passenger strand cleavage in vitro...
July 2016: Plant Cell
Heidi Gielen, Tony Remans, Jaco Vangronsveld, Ann Cuypers
BACKGROUND: MicroRNAs are important posttranscriptional regulators of gene expression playing a role in developmental processes as well as in stress responses, including metal stress responses. Despite the identification of several metal-responsive miRNAs, the regulation and the role of these miRNAs and their targets remain to be explored. In this study, miRNAs involved in the response to Cd and Cu excess in Arabidopsis thaliana are identified. In addition, the involvement of the transcription factor SPL7, namely the key regulator of Cu homeostasis, in these metal stress responses is demonstrated by the use of an spl7 knockout mutant...
2016: BMC Plant Biology
Xiaobo Li, Yang Lv, Jihong Hao, Hao Sun, Na Gao, Chengcheng Zhang, Runze Lu, Shizhi Wang, Lihong Yin, Yuepu Pu, Rui Chen
Metals are vital toxic components of fine particulate matter (PM2.5). Cellular responses to exposure to PM2.5 or PM metal components remain unknown. Post-transcriptional profiling and subsequent cell- and individual-based assays implied that the metal ion-binding miR-4516/RPL37/autophagy pathway could play a critical role in cellular responses to PM2.5 and PM metal stresses. miR-4516 was up-regulated in A549 cells exposed to PM2.5 and in the serum of individuals living in a city with moderate air pollution...
June 13, 2016: Oncotarget
Ann Cuypers, Sophie Hendrix, Rafaela Amaral Dos Reis, Stefanie De Smet, Jana Deckers, Heidi Gielen, Marijke Jozefczak, Christophe Loix, Hanne Vercampt, Jaco Vangronsveld, Els Keunen
Plants exposed to excess metals are challenged by an increased generation of reactive oxygen species (ROS) such as superoxide ([Formula: see text]), hydrogen peroxide (H2O2) and the hydroxyl radical ((•)OH). The mechanisms underlying this oxidative challenge are often dependent on metal-specific properties and might play a role in stress perception, signaling and acclimation. Although ROS were initially considered as toxic compounds causing damage to various cellular structures, their role as signaling molecules became a topic of intense research over the last decade...
2016: Frontiers in Plant Science
Yanfei Ding, Yaoyao Ye, Zhihua Jiang, Yi Wang, Cheng Zhu
Cadmium (Cd) is a non-essential heavy metal that is toxic to plants. microRNAs (miRNAs) are 21-nucleotide RNAs that are ubiquitous regulators of gene expression at the post-transcriptional level. Several plant miRNAs, such as miR390, have vital roles in plant growth, development and responses to environmental stresses including heavy metal stress. In this study, the expression of mature miR390 was significantly down-regulated under Cd stress in rice. Consequently, the target gene of miR390, OsSRK was dramatically induced by Cd treatment...
2016: Frontiers in Plant Science
Anwar M Masoud, Syed W Bihaqi, Jason T Machan, Nasser H Zawia, William E Renehan
There is a growing recognition of the impact of environmental toxins on the epigenetic regulation of gene expression, including the genes that play a critical role in neural development, neural function, and neurodegeneration. We have shown previously that exposure to the heavy metal lead (Pb) in early life results in a latent over-expression of AD-related proteins in rodents and primates. The present study provides evidence that early postnatal exposure to Pb also alters the expression of select miRNA. Mice were exposed to 0...
2016: Journal of Alzheimer's Disease: JAD
Brock Humphries, Zhishan Wang, Chengfeng Yang
MicroRNAs (miRNAs), an important component of epigenetic mechanisms of carcinogenesis, have been shown to play crucial roles in cancer initiation, metastasis, prognosis and responses to drug treatment and may serve as biomarkers for early diagnosis of cancer and tools for cancer therapy. Metal carcinogens, such as arsenic, cadmium, hexavalent chromium and nickel, are well-established human carcinogens causing various cancers upon long term exposure. However, the mechanism of metal carcinogenesis has not been well understood, which limits our capability to effectively diagnose and treat human cancers resulting from chronic metal carcinogen exposure...
February 20, 2016: Food and Chemical Toxicology
ZongBo Qiu, BenZhai Hai, JunLi Guo, YongFang Li, Liang Zhang
A increasing number of microRNAs have been shown to play important regulatory roles in plant responses to various metal stresses. However, little information about miRNAs especially miRNAs responsive to cadmium (Cd) stress is available in wheat. To investigate the role of miRNAs in responses to Cd stress, wheat seedlings were subjected to 250 μM Cd solution for 6, 12, 24 and 48 h, and analyses of morphological and physiological changes as well as the expression of five miRNAs and their corresponding targets were carried out...
April 2016: Plant Physiology and Biochemistry: PPB
Jing He, Jianjun Zhu, Changguo Gong, Jiming Qi, Han Xiao, Bin Jiang, Yulan Zhao
BACKGROUND: The diagnostic and prognostic value of microRNAs (miRNAs) in a variety of diseases is promising. The novel silicon nanowire (SiNW) biosensors have advantages in molecular detection because of their high sensitivity and fast response. In this study, poly-crystalline silicon nanowire field-effect transistor (poly-SiNW FET) device was developed to achieve specific and ultrasensitive detection of miRNAs without labeling and amplification. METHODS: The poly-SiNW FET was fabricated by a top-down Complementary Metal Oxide Semiconductor (CMOS) wafer fabrication based technique...
2015: PloS One
Michael Sand, Falk G Bechara, Marina Skrygan, Daniel Sand, Thilo Gambichler, Michael Bromba, Eggert Stockfleth, Schapoor Hessam
Since the discovery of microRNAs (miRNAs) there have been performed several studies showing perturbations in the expression of miRNAs and the miRNA expression machinery in cutaneous melanoma. Dicer, a pivotal cytosolic enzyme of miRNA maturation has shown to be affected by both somatic and germline mutations in a variety of cancers. Recent studies have shown that recurrent somatic mutations of Dicer frequently affect the metal-ion-binding sites D1709 and D1705 of its RNase IIIb domain, therefore called hot spot mutations...
July 2016: Pathology Oncology Research: POR
Aruo Nan, Xinke Zhou, Lijian Chen, Meiling Liu, Nan Zhang, Li Zhang, Yuanwei Luo, Zhenzhong Liu, Lijun Dai, Yiguo Jiang
As a common toxic metal, lead has significant neurotoxicity to brain development. Long non-coding RNAs (lncRNAs) function in multiple biological processes. However, whether lncRNAs are involved in lead-induced neurotoxicity remains unclear. Uc.173 is a lncRNA from a transcribed ultra-conservative region (T-UCR) of human, mouse and rat genomes. We established a lead-induced nerve injury mouse model. It showed the levels of Uc.173 decreased significantly in hippocampus tissue and serum of the model. We further tested the expression of Uc...
January 5, 2016: Oncotarget
Lesly Tejeda-Benitez, Jesus Olivero-Verbel
Caenorhabditis elegans is a nematode of microscopic size which, due to its biological characteristics, has been used since the 1970s as a model for research in molecular biology, medicine, pharmacology, and toxicology. It was the first animal whose genome was completely sequenced and has played a key role in the understanding of apoptosis and RNA interference. The transparency of its body, short lifespan, ability to self-fertilize and ease of culture are advantages that make it ideal as a model in toxicology...
2016: Reviews of Environmental Contamination and Toxicology
Zhimin Chen, Dawei Gu, Ming Zhou, Hui Shi, Shu Yan, Yunqing Cai
Cadmium (Cd), a toxic heavy metal, is known to induce kidney damage and renal tubular dysfunction. Our previous studies have indicated that selenium (Se), as an essential trace element, protects against Cd-induced nephrotoxicity via the mitochondrial apoptotic pathway in vivo and in vitro. The available evidence suggests that the expression of miRNAs is altered after Cd exposure. However, the regulatory effects of miRNAs on Cd-induced apoptosis and on the suppression by Se of Cd-induced apoptosis remain unclear...
January 5, 2016: Chemico-biological Interactions
Shuai Chen, Garrett J McKinney, Krista M Nichols, John K Colbourne, Maria S Sepúlveda
Daphnia pulex is a widely used toxicological model and is known for its sensitivity to cadmium (Cd). Recent research suggests that microRNAs (miRNAs) play a critical role in animal responses to heavy metals. To investigate the functions of D. pulex miRNAs under Cd exposure, we analyzed the miRNA profiles of D. pulex after 48 h using miRNA microarrays and validated our findings by q-PCR. miRNA dpu-let-7 was identified as a stably expressed gene and used as a reference. We identified 22 and 21 differentially expressed miRNAs under low (20 μg/L CdCl2) and high-exposure (40 μg/L CdCl2) concentrations compared to controls, respectively...
December 15, 2015: Environmental Science & Technology
Ru-Dong Li, Qian Wang, Bin-Cheng Yin, Bang-Ce Ye
Developing direct and convenient methods for microRNAs (miRNAs) analysis is of great significance in understanding biological functions of miRNAs, and early diagnosis of cancers. We have developed a rapid, enzyme-free method for miRNA detection based on nanoparticle-assisted signal amplification coupling fluorescent metal nanoclusters as signal output. The proposed method involves two processes: target miRNA-mediated nanoparticle capture, which consists of magnetic microparticle (MMP) probe and CuO nanoparticle (NP) probe, and nanoparticle-mediated amplification for signal generation, which consists of fluorescent DNA-Cu/Ag nanocluster (NC) and 3-mercaptopropionic acid (MPA)...
March 15, 2016: Biosensors & Bioelectronics
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