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Viral mirna

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https://www.readbyqxmd.com/read/28642130/mir-155-expression-is-downregulated-in-kidney-transplant-patients-with-human-cytomegalovirus-infection
#1
Massimiliano Bergallo, Stefano Gambarino, Paola Montanari, Valentina Daprà, Marco Rassu, Ilaria Galliano, Paolo Ravanini
MicroRNAs are small, noncoding RNAs that control expression of target genes through inhibiting protein translation or inducing degradation of mRNA transcripts of target genes. According to the latest update, 2578 unique mature miRNAs are currently annotated in the human genome and participate in the regulation of multiple events, such as cellular proliferation or apoptosis. Herpesvirus family comprehends many viruses able to control and modulate host-cell processes permitting the survival by a latency phase after primary infection...
June 19, 2017: Transplant Immunology
https://www.readbyqxmd.com/read/28639194/rnaa-induced-by-tata-box-targeting-micrornas
#2
Yijun Zhang, Hui Zhang
Recent studies reveal that some nuclear microRNAs (miRNA) and synthesized siRNAs target gene promoters to activate gene transcription (RNAa). Interestingly, our group identified a novel HIV-1-encoded miRNA, miR-H3, which targets specifically the core promoter TATA box of HIV-1 and activates viral gene expression. Depletion of miR-H3 significantly impaired the replication of HIV-1. miR-H3 mimics could activate viruses from CD4(+) T cells isolated from patients receiving suppressive highly active antiretroviral therapy, which is very intriguing for reducing HIV-1 latent reservoir...
2017: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/28624201/broad-spectrum-inhibition-of-respiratory-virus-infection-by-microrna-mimics-targeting-p38-mapk-signaling
#3
Jana L McCaskill, Sarah Ressel, Andreas Alber, Jane Redford, Ultan F Power, Jürgen Schwarze, Bernadette M Dutia, Amy H Buck
The majority of antiviral therapeutics target conserved viral proteins, however, this approach confers selective pressure on the virus and increases the probability of antiviral drug resistance. An alternative therapeutic strategy is to target the host-encoded factors that are required for virus infection, thus minimizing the opportunity for viral mutations that escape drug activity. MicroRNAs (miRNAs) are small noncoding RNAs that play diverse roles in normal and disease biology, and they generally operate through the post-transcriptional regulation of mRNA targets...
June 16, 2017: Molecular Therapy. Nucleic Acids
https://www.readbyqxmd.com/read/28617420/mirna-mediated-post-transcriptional-silencing-of-transgenes-leads-to-increased-adeno-associated-viral-vector-yield-and-targeting-specificity
#4
C A Reid, S L Boye, W W Hauswirth, D M Lipinski
The production of high titer recombinant adeno-associated virus (rAAV) vector is essential for treatment of genetic diseases affecting the retina and choroid, where anatomical constraints may limit injectable volumes. Problematically, cytotoxicity arising from over-expression of the transgene during vector production frequently leads to a reduction in vector yield. Herein, we evaluate the use of micro-RNA (miRNA) mediated silencing to limit over-expression of cytotoxic transgenes during packaging as a method of increasing vector yield...
June 15, 2017: Gene Therapy
https://www.readbyqxmd.com/read/28612962/amygdalar-expression-of-the-microrna-mir-101a-and-its-target-ezh2-contribute-to-rodent-anxiety-like-behavior
#5
Joshua L Cohen, Nateka L Jackson, Mary E Ballestas, William M Webb, Farah D Lubin, Sarah M Clinton
A greater understanding of neural mechanisms contributing to anxiety is needed in order to develop better therapeutic interventions. The current study interrogates a novel molecular mechanism that shapes anxiety-like behavior, demonstrating that the microRNA miR-101a-3p and its target, enhancer of zeste homolog 2 (Ezh2) in the amygdala, contribute to rodent anxiety-like behavior. We utilized rats that were selectively-bred for differences in emotionality and stress reactivity, showing that high novelty responding (HR) rats, which display low trait anxiety, have lower miR-101a-3p levels in the amygdala compared to low novelty responding (LR) rats that characteristically display high trait anxiety...
June 14, 2017: European Journal of Neuroscience
https://www.readbyqxmd.com/read/28609011/the-highly-pathogenic-h5n1-influenza-a-virus-down-regulated-several-cellular-micrornas-which-target-viral-genome
#6
Rong Wang, Ying-Ying Zhang, Jian-Sheng Lu, Bing-Hui Xia, Zhi-Xin Yang, Xu-Dong Zhu, Xiao-Wei Zhou, Pei-Tang Huang
Higher and prolonged viral replication is critical for the increased pathogenesis of the highly pathogenic avian influenza (HPAI) subtype of H5N1 influenza A virus (IAV) over the lowly pathogenic H1N1 IAV strain. Recent studies highlighted the considerable roles of cellular miRNAs in host defence against viral infection. In this report, using a 3'UTR reporter system, we identified several putative miRNA target sites buried in the H5N1 virus genome. We found two miRNAs, miR-584-5p and miR-1249, that matched with the PB2 binding sequence...
June 13, 2017: Journal of Cellular and Molecular Medicine
https://www.readbyqxmd.com/read/28602136/in-situ-forming-hydrogels-with-long-lasting-mir-21-enhances-the-therapeutic-potential-of-msc-by-sustaining-stimulation-of-target-gene
#7
Xianwei Zhang, Yufa Sun, Jianfeng Liu, Zhiyong Yi, Feng Gao, Qiaowei Liu, Yundai Chen
Regulating stem cells by microRNA (miRNA) is promising in regenerative medicine. However, non-viral transfection is usually transient while stably lentiviral transfection is accompanied with oncogenic risk. In the study, we explored the feasibility to retain the microRNAs within biopolymer hydrogels for their long-lasting working and sustaining stimulation of target gene. miRNA-21 (MiR-21), a reported microRNA enhancing the therapeutic potential of mesenchymal stem cells (MSCs) was used. We demonstrated that miR-21 could be efficiently retained within collagen hydrogel after forming complex with cationic polymer polyethylenimine (PEI)...
June 10, 2017: Journal of Biomaterials Science. Polymer Edition
https://www.readbyqxmd.com/read/28600495/functional-dissection-of-human-targets-for-kshv-encoded-mirnas-using-network-analysis
#8
Yu Wang, Yun Lin, Yanzhi Guo, Xuemei Pu, Menglong Li
Kaposi's sarcoma-associated herpesvirus (KSHV) is the etiological agent of Kaposi's sarcoma, primary effusion lymphoma and multicentric Castleman's disease, etc. In this study, we firstly systematically constructed the KSHV-encoded miRNA-regulated co-expressed protein-protein interaction network (CePPIN), which display the biological knowledge regarding the mechanism of miRNA-regulated KSHV pathogenesis. Then, we investigated the topological parameters for the proteins in CePPIN, especially for those miRNA targets and we found that cellular target genes of KSHV-encoded miRNAs tend to be hubs and bottlenecks in the network...
June 9, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28592533/micrornas-of-epstein-barr-virus-control-innate-and-adaptive-anti-viral-immunity
#9
Manuel Albanese, Takanobu Tagawa, Alexander Buschle, Wolfgang Hammerschmidt
More than 90% of humanity is infected with Epstein-Barr virus (EBV) lifelong. While infection is usually controlled by the immune system, the human host fails to completely eliminate the pathogen. Several herpesviral proteins are known that act as immunoevasins preventing or reducing recognition of EBV-infected cells. Only recently, microRNAs of EBV were identified to reduce immune recognition further. This Gem summarizes what we know about immunomodulatory miRNAs of herpesviruses.
June 7, 2017: Journal of Virology
https://www.readbyqxmd.com/read/28589873/human-cytomegalovirus-micrornas-are-carried-by-virions-and-dense-bodies-and-are-delivered-to-target-cells
#10
Abdul-Aleem Mohammad, Helena Costa, Natalia Landázuri, Weng-Onn Lui, Kjell Hultenby, Afsar Rahbar, Koon-Chu Yaiw, Cecilia Söderberg-Nauclér
Human cytomegalovirus (HCMV) infection results in the production of virions, dense bodies (DBs) and non-infectious enveloped particles, all of which incorporate proteins and RNAs that can be transferred to host cells. Here, we investigated whether virions and DBs also carry microRNAs (miRNAs) and assessed their delivery and functionality in cells. Human lung fibroblasts (MRC-5) were infected with the HCMV strain AD169, and conditioned cell culture medium was collected and centrifuged. The pellets were treated with RNase-ONE, and the virions and DBs were purified with a potassium tartrate-glycerol gradient and dialysed...
May 2017: Journal of General Virology
https://www.readbyqxmd.com/read/28586063/myc-and-hsa%C3%A2-mirna%C3%A2-423%C3%A2-5p-as-biomarkers-in-nasopharyngeal-carcinoma-revealed-by-mirna%C3%A2-mrna%C3%A2-pathway-network-integrated-analysis
#11
Huan Tian, Shicai Chen, Caiyun Zhang, Meng Li, Hongliang Zheng
The present study was performed to identify the dysregulated microRNAs (miRNAs/miRs) and mRNAs, and enriched pathways involved in nasopharyngeal carcinoma (NPC) through the establishment of an miRNA‑mRNA‑pathways network. mRNA and miRNA expression profiles were collected from the European Molecular Biology Laboratory‑European Bioinformatics Institute. Differentially expressed genes and differentially expressed miRNA were selectively screened using the metaDE package. Following prediction of the risk genes and pathway pairs involved in NPC, an miRNA‑mRNA‑pathway network was constructed by merging the miRNA‑mRNA pairs, the mRNA‑pathway pairs and the mRNA‑mRNA pairs...
June 6, 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/28586047/identification-and-functional-analysis-of-the-risk-micrornas-associated-with-cerebral-low-grade-glioma-prognosis
#12
Xinrui Liu, Bin Song, Shanji Li, Nan Wang, Hongfa Yang
Low-grade gliomas (LGGs) are associated with neurological disability. The present study used microRNA (miRNA) expression profiles to identify risk miRNAs for potential prognosis of cerebral LGGs. miRNA expression profiles and clinical data from 408 patients with cerebral LGGs were obtained from the Cancer Genome Atlas database. Risk miRNAs were identified by plotting Kaplan‑Meier curves and Cox proportional hazard regression analysis with the survival and KMsurv packages in R. A regulatory network of miRNA‑targets was constructed, followed by gene ontology (GO) function and Kyoto Encyclopedia of Genes and Genomes pathway enrichment analysis using the Database for Annotation, Visualization and Integrated Discovery...
June 6, 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/28558690/profile-and-functional-analysis-of-small-rnas-derived-from-aspergillus-fumigatus-infected-with-double-stranded-rna-mycoviruses
#13
Selin Özkan, Irina Mohorianu, Ping Xu, Tamas Dalmay, Robert H A Coutts
BACKGROUND: Mycoviruses are viruses that naturally infect and replicate in fungi. Aspergillus fumigatus, an opportunistic pathogen causing fungal lung diseases in humans and animals, was recently shown to harbour several different types of mycoviruses. A well-characterised defence against virus infection is RNA silencing. The A. fumigatus genome encodes essential components of the RNA silencing machinery, including Dicer, Argonaute and RNA-dependent RNA polymerase (RdRP) homologues. Active silencing of double-stranded (ds)RNA and the generation of small RNAs (sRNAs) has been shown for several mycoviruses and it is anticipated that a similar mechanism will be activated in A...
May 30, 2017: BMC Genomics
https://www.readbyqxmd.com/read/28555130/viruses-and-mirnas-more-friends-than-foes
#14
REVIEW
Patrice Bruscella, Silvia Bottini, Camille Baudesson, Jean-Michel Pawlotsky, Cyrille Feray, Michele Trabucchi
There is evidence that eukaryotic miRNAs (hereafter called host miRNAs) play a role in the replication and propagation of viruses. Expression or targeting of host miRNAs can be involved in cellular antiviral responses. Most times host miRNAs play a role in viral life-cycles and promote infection through complex regulatory pathways. miRNAs can also be encoded by a viral genome and be expressed in the host cell. Viral miRNAs can share common sequences with host miRNAs or have totally different sequences. They can regulate a variety of biological processes involved in viral infection, including apoptosis, evasion of the immune response, or modulation of viral life-cycle phases...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28545228/aberrant-dna-methylation-as-a-biomarker-and-a-therapeutic-target-of-cholangiocarcinoma
#15
REVIEW
Toshiaki Nakaoka, Yoshimasa Saito, Hidetsugu Saito
Cholangiocarcinoma is an epithelial malignancy arising in the region between the intrahepatic bile ducts and the ampulla of Vater at the distal end of the common bile duct. The effect of current chemotherapy regimens against cholangiocarcinoma is limited, and the prognosis of patients with cholangiocarcinoma is poor. Aberrant DNA methylation and histone modification induce silencing of tumor suppressor genes and chromosomal instability during carcinogenesis. Studies have shown that the tumor suppressor genes and microRNAs (miRNAs) including MLH1, p14, p16, death-associated protein kinase (DAPK), miR-370 and miR-376c are frequently methylated in cholangiocarcinoma...
May 23, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28542273/expression-profile-of-epstein-barr-virus-and-human-adenovirus-small-rnas-in-tonsillar-b-and-t-lymphocytes
#16
Farzaneh Assadian, Wael Kamel, Göran Laurell, Catharina Svensson, Tanel Punga, Göran Akusjärvi
We have used high-throughput small RNA sequencing to characterize viral small RNA expression in purified tonsillar B and T lymphocytes isolated from patients tested positive for Epstein-Barr virus (EBV) or human adenovirus (HAdV) infections, respectively. In the small set of patients analyzed, the expression profile of EBV and HAdV miRNAs could not distinguish between patients diagnosed with tonsillar hypertrophy or chronic/recurrent tonsillitis. The EBV miR-BART expression profile among the patients diagnosed with tonsillar diseases resembles most closely the pattern seen in EBV+ tumors (Latency II/I)...
2017: PloS One
https://www.readbyqxmd.com/read/28540676/micrornas-biomarkers-diagnostics-and-therapeutics
#17
Weili Huang
MicroRNAs (miRNAs) are small noncoding RNAs (21-23 nucleotides in length) that regulate gene expression at translational or posttranslational levels. The major regulatory mechanisms include translational repression or mRNA degradation (Filipowicz et al., Curr Opin Struct Biol 15:331-341, 2005).Aberrant expression of miRNAs has been found to be associated with a variety of human diseases such as cancers/tumors, diabetes, viral infections, cardiovascular diseases, neurodegenerative diseases, and other diseases (Wang et al...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28540675/viral-micrornas-host-micrornas-regulating-viruses-and-bacterial-microrna-like-rnas
#18
Sara-Elizabeth Cardin, Glen M Borchert
As masters of genome-wide regulation, miRNAs represent a key component in the complex architecture of cellular processes. Over the last decade, it has become increasingly apparent that miRNAs have many important roles in the development of disease and cancer. Recently, however, their role in viral and bacterial gene regulation as well as host gene regulation during disease progression has become a field of interest. Due to their small size, miRNAs are the ideal mechanism for bacteria and viruses that have limited room in their genomes, as a single miRNA can target up to ~30 genes...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28538662/maternal-factors-that-induce-epigenetic-changes-contribute-to-neurological-disorders-in-offspring
#19
REVIEW
Avijit Banik, Deepika Kandilya, Seshadri Ramya, Walter Stünkel, Yap Seng Chong, S Thameem Dheen
It is well established that the regulation of epigenetic factors, including chromatic reorganization, histone modifications, DNA methylation, and miRNA regulation, is critical for the normal development and functioning of the human brain. There are a number of maternal factors influencing epigenetic pathways such as lifestyle, including diet, alcohol consumption, and smoking, as well as age and infections (viral or bacterial). Genetic and metabolic alterations such as obesity, gestational diabetes mellitus (GDM), and thyroidism alter epigenetic mechanisms, thereby contributing to neurodevelopmental disorders (NDs) such as embryonic neural tube defects (NTDs), autism, Down's syndrome, Rett syndrome, and later onset of neuropsychological deficits...
May 24, 2017: Genes
https://www.readbyqxmd.com/read/28534962/galectin%C3%A2-9-ameliorates-fulminant-liver-injury
#20
Tomoko Tadokoro, Asahiro Morishita, Teppei Sakamoto, Shintaro Fujihara, Koji Fujita, Shima Mimura, Kyoko Oura, Takako Nomura, Joji Tani, Hirohito Yoneyama, Hisakazu Iwama, Takashi Himoto, Toshiro Niki, Mitsuomi Hirashima, Tsutomu Masaki
Fulminant hepatitis is a severe liver disease resulting in hepatocyte necrosis. Galectin‑9 (Gal‑9) is a tandem‑repeat‑type galectin that has been evaluated as a potential therapeutic agent for various diseases that regulate the host immune system. Concanavalin A (ConA) injection into mice results in serious, immune‑mediated liver injury similar to human viral, autoimmune and fulminant hepatitis. The present study investigated the effects of Gal‑9 treatment on fulminant hepatitis in vivo and the effect on the expression of microRNAs (miRNAs), in order to identify specific miRNAs associated with the immune effects of Gal‑9...
July 2017: Molecular Medicine Reports
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