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miRNA biogenesis

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https://www.readbyqxmd.com/read/28922425/hypoxia-inducible-factor-1-alpha-as-a-therapeutic-target-for-primary-effusion-lymphoma
#1
Prabha Shrestha, David A Davis, Ravindra P Veeranna, Robert F Carey, Coralie Viollet, Robert Yarchoan
Primary effusion lymphoma (PEL) is an aggressive B-cell lymphoma with poor prognosis caused by Kaposi's sarcoma-associated herpesvirus (KSHV). Previous studies have revealed that HIF-1α, which mediates much of the cellular response to hypoxia, plays an important role in life cycle of KSHV. KSHV infection promotes HIF-1α activity, and several KSHV genes are in turn activated by HIF-1α. In this study, we investigated the effects of knocking down HIF-1α in PELs. We observed that HIF-1α knockdown in each of two PEL lines leads to a reduction in both aerobic and anaerobic glycolysis as well as lipid biogenesis, indicating that HIF-1α is necessary for maintaining a metabolic state optimal for growth of PEL...
September 18, 2017: PLoS Pathogens
https://www.readbyqxmd.com/read/28915609/polymorphisms-of-pri-mir-219-1-are-associated-with-the-susceptibility-and-prognosis-of-non-small-cell-lung-cancer-in-a-northeast-chinese-population
#2
Chang Zheng, Xuelian Li, Lingzi Xia, Xue Fang, Xiaowei Quan, Zhihua Yin, Yuxia Zhao, Baosen Zhou
Occurrence and development of non-small cell lung cancer (NSCLC) is a complex process affected both by gene and environment. Single nucleotide polymorphisms (SNPs) in microRNAs' (miRNAs) biogenesis influenced the expression of mature miRNAs, further had an impact on risk of NSCLC. Our study focused on the correlation between rs213210, rs421446 or rs107822 polymorphisms in pri-miR-219-1 and susceptibility or prognosis of NSCLC in Chinese. A case-control study of 405 new-diagnosis patients and 405 controls was performed...
August 22, 2017: Oncotarget
https://www.readbyqxmd.com/read/28915552/dicer-suppresses-cytoskeleton-remodeling-and-tumorigenesis-of-colorectal-epithelium-by-mir-324-5p-mediated-suppression-of-hmgxb3-and-wasf-2
#3
Li Na Sun, Cheng Xing, Zheng Zhi, Yao Liu, Liang-Yan Chen, Tong Shen, Qun Zhou, Yu Hong Liu, Wen Juan Gan, Jing-Ru Wang, Yong Xu, Jian Ming Li
Emerging evidence indicates that microRNAs, a class of small and well-conserved noncoding RNAs, participate in many physiological and pathological processes. RNase III endonuclease DICER is one of the key enzymes for microRNA biogenesis. Here, we found that DICER was downregulated in tumor samples of colorectal cancer (CRC) patients at both mRNA and protein levels. Importantly, intestinal epithelial cell (IEC)-specific deletion of Dicer mice got more tumors after azoxymethane and dextran sulfate sodium (DSS) administration...
August 22, 2017: Oncotarget
https://www.readbyqxmd.com/read/28912016/arabidopsis-thaliana-mirnas-promote-embryo-pattern-formation-beginning-in-the-zygote
#4
Alma Armenta-Medina, Daniel Lepe-Soltero, Daoquan Xiang, Raju Datla, Cei Abreu-Goodger, C Stewart Gillmor
miRNAs are essential regulators of cell identity, yet their role in early embryo development in plants remains largely unexplored. To determine the earliest stage at which miRNAs act to promote pattern formation in embryogenesis, we examined a series of mutant alleles in the Arabidopsis thaliana miRNA biogenesis enzymes DICER-LIKE 1 (DCL1), SERRATE (SE), and HYPONASTIC LEAVES 1 (HYL1). Cellular and patterning defects were observed in dcl1, se and hyl1 embryos from the zygote through the globular stage of embryogenesis...
September 11, 2017: Developmental Biology
https://www.readbyqxmd.com/read/28904816/regulation-of-hnrnpa1-by-micrornas-controls-the-mir-18a-k-ras-axis-in-chemotherapy-resistant-ovarian-cancer
#5
Cristian Rodriguez-Aguayo, Paloma Del C Monroig, Roxana S Redis, Emine Bayraktar, Maria I Almeida, Cristina Ivan, Enrique Fuentes-Mattei, Mohammed H Rashed, Arturo Chavez-Reyes, Bulent Ozpolat, Rahul Mitra, Anil K Sood, George A Calin, Gabriel Lopez-Berestein
The regulation of microRNA (miRNA) biogenesis, function and degradation involves a range of mechanisms, including interactions with RNA-binding proteins. The potential contribution of regulatory miRNAs to the expression of these RNA interactor proteins that could control other miRNAs expression is still unclear. Here we demonstrate a regulatory circuit involving oncogenic and tumor-suppressor miRNAs and an RNA-binding protein in a chemotherapy-resistant ovarian cancer model. We identified and characterized miR-15a-5p and miR-25-3p as negative regulators of hnRNPA1 expression, which is required for the processing of miR-18a-3p, an inhibitor of the K-RAS oncogene...
2017: Cell Discovery
https://www.readbyqxmd.com/read/28900074/-regulation-of-microrna-activity-in-stress
#6
S Yu Funikov, O G Zatcepina
Stressors substantially affect the physiology of cells. Depending on the severity and duration of stress exposure, cells either strive to maintain homeostasis or adapt by adjusting their gene expression patterns. One of the mechanisms to change gene expression is regulating the microRNA (miRNA) levels and activities of microRNA-protein complexes. A fine tuning of the interaction of miRNAs with their mRNA targets determines the specificity of protein synthesis and the quantitative composition of the protein pool in stress...
July 2017: Molekuliarnaia Biologiia
https://www.readbyqxmd.com/read/28893199/comprehensive-survey-and-evolutionary-analysis-of-genome-wide-mirna-genes-from-ten-diploid-oryza-species
#7
Showkat Ahmad Ganie, Ananda Bhusan Debnath, Abubakar Mohammad Gumi, Tapan Kumar Mondal
BACKGROUND: MicroRNAs (miRNAs) are non-coding RNAs that play versatile roles in post-transcriptional gene regulation. Although much is known about their biogenesis, and gene regulation very little is known about their evolutionary relation among the closely related species. RESULT: All the orthologous miRNA genes of Oryza sativa (japonica) from 10 different Oryza species were identified, and the evolutionary changes among these genes were analysed. Significant differences in the expansion of miRNA gene families were observed across the Oryza species...
September 11, 2017: BMC Genomics
https://www.readbyqxmd.com/read/28886127/genome-wide-mirna-response-to-anacardic-acid-in-breast-cancer-cells
#8
David J Schultz, Penn Muluhngwi, Negin Alizadeh-Rad, Madelyn A Green, Eric C Rouchka, Sabine J Waigel, Carolyn M Klinge
MicroRNAs are biomarkers and potential therapeutic targets for breast cancer. Anacardic acid (AnAc) is a dietary phenolic lipid that inhibits both MCF-7 estrogen receptor α (ERα) positive and MDA-MB-231 triple negative breast cancer (TNBC) cell proliferation with IC50s of 13.5 and 35 μM, respectively. To identify potential mediators of AnAc action in breast cancer, we profiled the genome-wide microRNA transcriptome (microRNAome) in these two cell lines altered by the AnAc 24:1n5 congener. Whole genome expression profiling (RNA-seq) and subsequent network analysis in MetaCore Gene Ontology (GO) algorithm was used to characterize the biological pathways altered by AnAc...
2017: PloS One
https://www.readbyqxmd.com/read/28881308/overexpression-of-exportin-5-overrides-the-inhibitory-effect-of-mirnas-regulation-control-and-stabilize-proteins-via-posttranslation-modifications-in-prostate-cancer
#9
Naseruddin Höti, Shuang Yang, Paul Aiyetan, Binod Kumar, Yingwei Hu, David Clark, Arife Unal Eroglu, Punit Shah, Tamara Johnson, Wasim H Chowdery, Hui Zhang, Ronald Rodriguez
Although XPO5 has been characterized to have tumor-suppressor features in the miRNA biogenesis pathway, the impact of altered expression of XPO5 in cancers is unexplored. Here we report a novel "oncogenic" role of XPO5 in advanced prostate cancer. Using prostate cancer models, we found that excess levels of XPO5 override the inhibitory effect of the canoncial miRNA-mRNA regulation, resulting in a global increase in proteins expression. Importantly, we found that decreased expression of XPO5 could promote an increase in proteasome degradation, whereas overexpression of XPO5 leads to altered protein posttranslational modification via hyperglycosylation, resulting in cellular protein stability...
September 4, 2017: Neoplasia: An International Journal for Oncology Research
https://www.readbyqxmd.com/read/28880477/exosomes-as-new-players-in-metabolic-organ-cross-talk
#10
REVIEW
Claudiane Guay, Romano Regazzi
Blood glucose homeostasis requires a constant communication between insulin-secreting and insulin-sensitive cells. A wide variety of circulating factors, including hormones, cytokines and chemokines work together to orchestrate the systemic response of metabolic organs to changes in the nutritional state. Failure in the coordination between these organs can lead to a rise in blood glucose levels and to the appearance of metabolic disorders such as diabetes mellitus. Exosomes are small extracellular vesicles (EVs) that are produced via the endosomal pathway and are released from the cells upon fusion of multivesicular bodies with the plasma membrane...
September 2017: Diabetes, Obesity & Metabolism
https://www.readbyqxmd.com/read/28880270/circulating-micrornas-in-breast-cancer-novel-diagnostic-and-prognostic-biomarkers
#11
REVIEW
Rimi Hamam, Dana Hamam, Khalid A Alsaleh, Moustapha Kassem, Waleed Zaher, Musaad Alfayez, Abdullah Aldahmash, Nehad M Alajez
Effective management of breast cancer depends on early diagnosis and proper monitoring of patients' response to therapy. However, these goals are difficult to achieve because of the lack of sensitive and specific biomarkers for early detection and for disease monitoring. Accumulating evidence in the past several years has highlighted the potential use of peripheral blood circulating nucleic acids such as DNA, mRNA and micro (mi)RNA in breast cancer diagnosis, prognosis and for monitoring response to anticancer therapy...
September 7, 2017: Cell Death & Disease
https://www.readbyqxmd.com/read/28851367/role-of-exosomal-proteins-in-cancer-diagnosis
#12
REVIEW
Weihua Li, Chuanyun Li, Tong Zhou, Xiuhong Liu, Xiaoni Liu, Xiuhui Li, Dexi Chen
Exosomes are emerging as a new type of cancer biomarkers. Exosome is a bilayered nano-sized vesicle secreted by various living cells in all body fluids. Based on the expanding albeit incomplete knowledge of their biogenesis, secretion by cells and cancer cell-specific molecular and genetic contents, exosomes are viewed as promising, clinically-relevant surrogates of cancer progression and response to therapy. Preliminary proteomic, genetic and functional profiling of cancer cell-derived or cancer plasma-derived exosomes confirms their unique characteristics...
August 29, 2017: Molecular Cancer
https://www.readbyqxmd.com/read/28846091/neat1-scaffolds-rna-binding-proteins-and-the-microprocessor-to-globally-enhance-pri-mirna-processing
#13
Li Jiang, Changwei Shao, Qi-Jia Wu, Geng Chen, Jie Zhou, Bo Yang, Hairi Li, Lan-Tao Gou, Yi Zhang, Yangming Wang, Gene W Yeo, Yu Zhou, Xiang-Dong Fu
MicroRNA (miRNA) biogenesis is known to be modulated by a variety of RNA-binding proteins (RBPs), but in most cases, individual RBPs appear to influence the processing of a small subset of target miRNAs. Here, we report that the RNA-binding NONO-PSF heterodimer binds a large number of expressed pri-miRNAs in HeLa cells to globally enhance pri-miRNA processing by the Drosha-DGCR8 Microprocessor. NONO and PSF are key components of paraspeckles organized by the long noncoding RNA (lncRNA) NEAT1. We further demonstrate that NEAT1 also has a profound effect on global pri-miRNA processing...
August 28, 2017: Nature Structural & Molecular Biology
https://www.readbyqxmd.com/read/28835265/conservation-and-divergence-of-small-rna-pathways-and-micrornas-in-land-plants
#14
Chenjiang You, Jie Cui, Hui Wang, Xinping Qi, Li-Yaung Kuo, Hong Ma, Lei Gao, Beixin Mo, Xuemei Chen
BACKGROUND: As key regulators of gene expression in eukaryotes, small RNAs have been characterized in many seed plants, and pathways for their biogenesis, degradation, and action have been defined in model angiosperms. However, both small RNAs themselves and small RNA pathways are not well characterized in other land plants such as lycophytes and ferns, preventing a comprehensive evolutionary perspective on small RNAs in land plants. RESULTS: Using 25 representatives from major lineages of lycophytes and ferns, most of which lack sequenced genomes, we characterized small RNAs and small RNA pathways in these plants...
August 23, 2017: Genome Biology
https://www.readbyqxmd.com/read/28828274/micrornas-tend-to-synergistically-control-expression-of-genes-encoding-extensively-expressed-proteins-in-humans
#15
Xue Chen, Wei Zhao, Ye Yuan, Yan Bai, Yong Sun, Wenliang Zhu, Zhimin Du
Considering complicated microRNA (miRNA) biogenesis and action mechanisms, it was thought so high energy-consuming for a cell to afford simultaneous over-expression of many miRNAs. Thus it prompts that an alternative miRNA regulation pattern on protein-encoding genes must exist, which has characteristics of energy-saving and precise protein output. In this study, expression tendency of proteins encoded by miRNAs' target genes was evaluated in human organ scale, followed by quantitative assessment of miRNA synergism...
2017: PeerJ
https://www.readbyqxmd.com/read/28811300/epigenetic-regulation-by-the-menin-pathway
#16
REVIEW
Zijie Feng, Jian Ma, Xianxin Hua
There is a trend of increasing prevalence of neuroendocrine tumors (NETs), and the inherited multiple endocrine neoplasia type 1 (MEN1) syndrome serves as a genetic model to investigate how NETs develop and the underlying mechanisms. Menin, encoded by the MEN1 gene, at least partly acts as a scaffold protein by interacting with multiple partners to regulate cellular homeostasis of various endocrine organs. Menin has multiple functions including regulation of several important signaling pathways by controlling gene transcription...
October 2017: Endocrine-related Cancer
https://www.readbyqxmd.com/read/28769895/micrornas-as-important-players-in-host-adenovirus-interactions
#17
REVIEW
Diogo Piedade, José M Azevedo-Pereira
MicroRNAs (miRNAs) are powerful regulators of gene expression and fine-tuning genes in all tissues. Cellular miRNAs can control 100s of biologic processes (e.g., morphogenesis of embryonic structures, differentiation of tissue-specific cells, and metabolic control in specific cell types) and have been involved in the regulation of nearly all cellular pathways. Inherently to their involvement in different physiologic processes, miRNAs deregulation has been associated with several diseases. Moreover, several viruses have been described as either, avoid and block cellular miRNAs or synthesize their own miRNA to facilitate infection and pathogenesis...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28754532/centenarians-maintain-mirna-biogenesis-pathway-while-it-is-impaired-in-octogenarians
#18
C Borrás, E Serna, J Gambini, M Inglés, J Vina
Centenarians but not octogenarians up regulate the expression of miRNAs, as we previously reported. We have looked into miRNA biogenesis. We show that RNA POL II, DROSHA, EXPORTIN 5 and DICER, are up-regulated in centenarians compared with octogenarians. Furthermore, factors involved in the control of these miRNAs biogenesis genes are also up-regulated in centenarians. Therefore, the up-regulation of miRNA expression in centenarians can be explained in part because miRNA biogenesis pathway is depressed in octogenarians (ordinary aging) while it is maintained in centenarians (extraordinary aging)...
July 25, 2017: Mechanisms of Ageing and Development
https://www.readbyqxmd.com/read/28753462/micrornas-and-rna-binding-protein-regulators-of-micrornas-in-the-control-of-pluripotency-and-reprogramming
#19
REVIEW
Jing Hao, Fei-Fei Duan, Yangming Wang
Post-transcriptional and translational regulations play essential roles during cellular reprogramming and in the maintenance and differentiation of pluripotent stem cells (PSCs). MicroRNAs (miRNAs) control cell cycle, glycolysis, chromatin state, survival and pluripotency of ESCs. Likewise, many miRNAs assist or act as a barrier for the generation of induced pluripotent stem cells (iPSCs). Recent studies also reveal exciting new directions on miRNA functions in regulating the switch between naive and primed pluripotent states as well as the establishment of totipotent-like state...
July 25, 2017: Current Opinion in Genetics & Development
https://www.readbyqxmd.com/read/28749585/mir3954-is-a-trigger-of-phasirnas-that-affects-flowering-time-in-citrus
#20
Yuanlong Liu, Lili Ke, Guizhi Wu, Yuantao Xu, Xiaomeng Wu, Rui Xia, Xiuxin Deng, Qiang Xu
In plant, a few 22 nt miRNAs direct cleavages of their targets and trigger the biogenesis of phased small interfering RNAs (phasiRNAs) in plant. In this study, we characterized a miRNA triggering phasiRNAs generation, miR3954, and explored its downstream target genes and potential function. Our results demonstrated that miR3954 showed specific expression in the flowers of citrus species and it targeted a NAC transcription factor (Cs7g22460) and two non-coding RNA transcripts (lncRNAs, Cs1g09600 and Cs1g09635)...
July 27, 2017: Plant Journal: for Cell and Molecular Biology
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