Abstract
MicroRNAs are non-coding RNAs with roles in many cellular processes. Tissue-specific miRNA profiles associated with senescence have been described for several cell and tissue types. We aimed to characterise miRNAs involved in core, rather than tissue-specific, senescence pathways by assessment of common miRNA expression differences in two different cell types, with follow-up of predicted targets in human peripheral blood. MicroRNAs were profiled in early and late passage primary lung and skin fibroblasts to identify commonly-deregulated miRNAs. Expression changes of their bioinformatically-predicted mRNA targets were then assessed in both cell types and in human peripheral blood from elderly participants in the InCHIANTI study. 57/178 and 26/492 microRNAs were altered in late passage skin and lung cells respectively. Three miRNAs (miR-92a, miR-15b and miR-125a-3p) were altered in both tissues. 14 mRNA targets of the common miRNAs were expressed in lung and skin fibroblasts, of which two demonstrated up-regulation in late passage skin and lung cells (LYST; p = 0.02 [skin] and 0.02 [lung] INMT; p = 0.03 [skin] and 0.04 [lung]). ZMPSTE24 and LHFPL2 demonstrated altered expression in late passage skin cells only (p = 0.01 and 0.05 respectively). LHFPL2 was also positively correlated with age in peripheral blood (p value = 6.6 × 10−5). We find that the majority of senescence-associated miRNAs demonstrate tissue-specific effects. However, miRNAs showing common effects across tissue types may represent those associated with core, rather than tissue-specific senescence processes.
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Acknowledgments
The authors would like to acknowledge Dr Jonathan Locke for help and advice regarding the miRNA analysis and Mr Ben Lee for technical assistance. This work was supported internal funds from the University of Exeter Medical School. TvZ acknowledges funding from BBSRC Grant reference BB/I020748/1. SNG acknowledges funding from the Addison Wheeler Trust, Durham University. PvDW was supported by an Erasmus fellowship.
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Alice C. Holly and Sushma Grellscheid have contributed equally to this publication.
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Holly, A.C., Grellscheid, S., van de Walle, P. et al. Comparison of senescence-associated miRNAs in primary skin and lung fibroblasts. Biogerontology 16, 423–434 (2015). https://doi.org/10.1007/s10522-015-9560-5
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DOI: https://doi.org/10.1007/s10522-015-9560-5