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Resveratrol post-transcriptionally regulates pro-inflammatory gene expression via regulation of KSRP RNA binding activity (2014)

Bollmann, F., Art, J., Henke, J., Schrick, K., Besche, V., Bros, M., Li, H., Siuda, D., Handler, N., Bauer, F., Erker, T., Behnke, F., Monch, B., Hardle, L., Hoffmann, M., Chen, C.-Y., Forstermann, U., Dirsch, V. M., Werz, O., Kleinert, H., Pautz, A.

Oxford University Press

In: Nucleic Acids Research

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Publication Date: 2014-11-12

Description: Resveratrol shows beneficial effects in inflammation-based diseases like cancer, cardiovascular and chronic inflammatory diseases. Therefore, the molecular mechanisms of the anti-inflammatory resveratrol effects deserve more attention. In human epithelial DLD-1 and monocytic Mono Mac 6 cells resveratrol decreased the expression of iNOS, IL-8 and TNF-α by reducing mRNA stability without inhibition of the promoter activity. Shown by pharmacological and siRNA-mediated inhibition, the observed effects are SIRT1-independent. Target-fishing and drug responsive target stability experiments showed selective binding of resveratrol to the RNA-binding protein KSRP, a central post-transcriptional regulator of pro-inflammatory gene expression. Knockdown of KSRP expression prevented resveratrol-induced mRNA destabilization in human and murine cells. Resveratrol did not change KSRP expression, but immunoprecipitation experiments indicated that resveratrol reduces the p38 MAPK-related inhibitory KSRP threonine phosphorylation, without blocking p38 MAPK activation or activity. Mutation of the p38 MAPK target site in KSRP blocked the resveratrol effect on pro-inflammatory gene expression. In addition, resveratrol incubation enhanced KSRP-exosome interaction, which is important for mRNA degradation. Finally, resveratrol incubation enhanced its intra-cellular binding to the IL-8, iNOS and TNF-α mRNA. Therefore, modulation of KSRP mRNA binding activity and, thereby, enhancement of mRNA degradation seems to be the common denominator of many anti-inflammatory effects of resveratrol.

Print ISSN: 0305-1048

Electronic ISSN: 1362-4962

Topics: Biology

Published by Oxford University Press

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Noncoding RNA. piRNA-guided slicing specifies transcripts for Zucchini-dependent, phased piRNA biogenesis (2015)

F. Mohn ; D. Handler ; J. Brennecke

American Association for the Advancement of Science (AAAS)

In: Science. 348(6236): 812-7. doi: 10.1126/science.aaa1039.

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Publication Date: 2015-05-16

Description: In animal gonads, PIWI-clade Argonaute proteins repress transposons sequence-specifically via bound Piwi-interacting RNAs (piRNAs). These are processed from single-stranded precursor RNAs by largely unknown mechanisms. Here we show that primary piRNA biogenesis is a 3'-directed and phased process that, in the Drosophila germ line, is initiated by secondary piRNA-guided transcript cleavage. Phasing results from consecutive endonucleolytic cleavages catalyzed by Zucchini, implying coupled formation of 3' and 5' ends of flanking piRNAs. Unexpectedly, Zucchini also participates in 3' end formation of secondary piRNAs. Its function can, however, be bypassed by downstream piRNA-guided precursor cleavages coupled to exonucleolytic trimming. Our data uncover an evolutionarily conserved piRNA biogenesis mechanism in which Zucchini plays a central role in defining piRNA 5' and 3' ends.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Mohn, Fabio -- Handler, Dominik -- Brennecke, Julius -- New York, N.Y. -- Science. 2015 May 15;348(6236):812-7. doi: 10.1126/science.aaa1039.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institute of Molecular Biotechnology of the Austrian Academy of Sciences (IMBA), Dr. Bohrgasse 3, 1030 Vienna, Austria. ; Institute of Molecular Biotechnology of the Austrian Academy of Sciences (IMBA), Dr. Bohrgasse 3, 1030 Vienna, Austria. julius.brennecke@imba.oeaw.ac.at.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/25977553" target="_blank"〉PubMed〈/a〉

Keywords: Animals ; Drosophila Proteins/genetics/*metabolism ; Drosophila melanogaster/*enzymology/genetics ; Endoribonucleases/genetics/*metabolism ; Evolution, Molecular ; Female ; Germ Cells/enzymology ; Male ; Mice ; Ovary/enzymology ; *RNA Cleavage ; RNA, Guide/*metabolism ; RNA, Small Interfering/biosynthesis/*metabolism ; RNA-Binding Proteins/genetics ; Testis/enzymology ; *Transcription, Genetic ; Uridine/metabolism

Print ISSN: 0036-8075

Electronic ISSN: 1095-9203

Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics