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Sökning: WFRF:(Van De Bunt Martijn)

  • Resultat 11-12 av 12
  • Föregående 1[2]
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11.
  • Tattikota, Sudhir G, et al. (författare)
  • Argonaute2 Mediates Compensatory Expansion of the Pancreatic β Cell.
  • 2014
  • Ingår i: Cell Metabolism. - : Cell Press. - 1550-4131. ; 19:1, s. 122-134
  • Tidskriftsartikel (refereegranskat)abstract
    • Pancreatic β cells adapt to compensate for increased metabolic demand during insulin resistance. Although the microRNA pathway has an essential role in β cell proliferation, the extent of its contribution is unclear. Here, we report that miR-184 is silenced in the pancreatic islets of insulin-resistant mouse models and type 2 diabetic human subjects. Reduction of miR-184 promotes the expression of its target Argonaute2 (Ago2), a component of the microRNA-induced silencing complex. Moreover, restoration of miR-184 in leptin-deficient ob/ob mice decreased Ago2 and prevented compensatory β cell expansion. Loss of Ago2 during insulin resistance blocked β cell growth and relieved the regulation of miR-375-targeted genes, including the growth suppressor Cadm1. Lastly, administration of a ketogenic diet to ob/ob mice rescued insulin sensitivity and miR-184 expression and restored Ago2 and β cell mass. This study identifies the targeting of Ago2 by miR-184 as an essential component of the compensatory response to regulate proliferation according to insulin sensitivity.
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12.
  • Viñuela, Ana, et al. (författare)
  • Genetic variant effects on gene expression in human pancreatic islets and their implications for T2D
  • Ingår i: Nature Communications. - : Nature Publishing Group. - 2041-1723. ; 11:1, s. 4912-4912
  • Tidskriftsartikel (refereegranskat)abstract
    • Most signals detected by genome-wide association studies map to non-coding sequence and their tissue-specific effects influence transcriptional regulation. However, key tissues and cell-types required for functional inference are absent from large-scale resources. Here we explore the relationship between genetic variants influencing predisposition to type 2 diabetes (T2D) and related glycemic traits, and human pancreatic islet transcription using data from 420 donors. We find: (a) 7741 cis-eQTLs in islets with a replication rate across 44 GTEx tissues between 40% and 73%; (b) marked overlap between islet cis-eQTL signals and active regulatory sequences in islets, with reduced eQTL effect size observed in the stretch enhancers most strongly implicated in GWAS signal location; (c) enrichment of islet cis-eQTL signals with T2D risk variants identified in genome-wide association studies; and (d) colocalization between 47 islet cis-eQTLs and variants influencing T2D or glycemic traits, including DGKB and TCF7L2. Our findings illustrate the advantages of performing functional and regulatory studies in disease relevant tissues.
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  • Resultat 11-12 av 12
  • Föregående 1[2]
 
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