Induction of miR-155 after Brain Injury Promotes Type 1 Interferon and has a Neuroprotective Effect

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  • Harrison, Emily B.
    • Affiliation: University of North Carolina at Chapel Hill
    • Other Affiliation: Department of Pharmacology and Experimental Neuroscience; College of Medicine; University of Nebraska Medical Center
  • Emanuel, Katy
    • Other Affiliation: Department of Pharmacology and Experimental Neuroscience; College of Medicine; University of Nebraska Medical Center
  • Lamberty, Benjamin G.
    • Other Affiliation: Department of Pharmacology and Experimental Neuroscience; College of Medicine; University of Nebraska Medical Center
  • Morsey, Brenda M.
    • Other Affiliation: Department of Pharmacology and Experimental Neuroscience; College of Medicine; University of Nebraska Medical Center
  • Li, Min
    • Other Affiliation: Creighton University
  • Kelso, Matthew L.
    • Other Affiliation: Medpace Reference Laboratories
  • Yelamanchili, Sowmya V.
    • Other Affiliation: Department of Pharmacology and Experimental Neuroscience; College of Medicine; University of Nebraska Medical Center
  • Fox, Howard S.
    • Other Affiliation: Department of Pharmacology and Experimental Neuroscience; College of Medicine; University of Nebraska Medical Center
Abstract
  • Traumatic brain injury (TBI) produces profound and lasting neuroinflammation that has both beneficial and detrimental effects. Recent evidence has implicated microRNAs (miRNAs) in the regulation of inflammation both in the periphery and the CNS. We examined the expression of inflammation associated miRNAs in the context of TBI using a mouse controlled cortical impact (CCI) model and found increased levels of miR-21, miR-223 and miR-155 in the hippocampus after CCI. The expression of miR-155 was elevated 9-fold after CCI, an increase confirmed by in situ hybridization (ISH). Interestingly, expression of miR-155 was largely found in neuronal nuclei as evidenced by co-localization with DAPI in MAP2 positive neurons. In miR-155 knock out (KO) mice expression of type I interferons IFNα and IFNβ, as well as IFN regulatory factor 1 and IFN-induced chemokine CXCL10 was decreased after TBI relative to wild type (WT) mice. Unexpectedly, miR-155 KO mice had increased levels of microglial marker Iba1 and increased neuronal degeneration as measured by fluoro-jade C (FJC) staining, suggesting a neuroprotective role for miR-155 in the context of TBI. This work demonstrates a role for miR-155 in regulation of the IFN response and neurodegeneration in the aftermath of TBI. While the presence of neuronal nuclear miRNAs has been described previously, their importance in disease states is relatively unknown. Here, we show evidence of dynamic regulation and pathological function of a nuclear miRNA in TBI.
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  • Article
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  • In Copyright
Journal title
  • Frontiers in Molecular Neuroscience
Journal volume
  • 10
Language
  • English
ISSN
  • 1662-5099

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