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Time-dependent changes in gene expression induced by secreted amyloid precursor protein-alpha in the rat hippocampus
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  • 作者：Margaret M Ryan (1) (2) (3)
    Gary P Morris (1) (3) (5)
    Bruce G Mockett (1) (4)
    Katie Bourne (1) (3)
    Wickliffe C Abraham (1) (4)
    Warren P Tate (1) (3)
    Joanna M Williams (1) (2)
  • 关键词：Secreted amyloid precursor protein alpha ; Hippocampus ; Organotypic slice cultures ; Microarray ; Ingenuity pathway analysis ; Neuroprotection ; Immediate early genes ; MicroRNA ; NF ; κB
  • 刊名：BMC Genomics
  • 出版年：2013
  • 出版时间：December 2013
  • 年：2013
  • 卷：14
  • 期：1
  • 全文大小：893KB
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  • 作者单位：Margaret M Ryan (1) (2) (3)
    Gary P Morris (1) (3) (5)
    Bruce G Mockett (1) (4)
    Katie Bourne (1) (3)
    Wickliffe C Abraham (1) (4)
    Warren P Tate (1) (3)
    Joanna M Williams (1) (2)

    1. Brain Health Research Centre, University of Otago, PO Box 56, Dunedin, New Zealand
    2. Department of Anatomy, Otago School of Medical Sciences, PO Box 913, Dunedin, New Zealand
    3. Department of Biochemistry, Otago School of Medical Sciences, PO Box 56, Dunedin, New Zealand
    5. Neuroscience Department, Garvan Institute of Medical Research, Sydney, Australia
    4. Department of Psychology, University of Otago, PO Box 56, Dunedin, New Zealand
文摘
Background Differential processing of the amyloid precursor protein liberates either amyloid-?, a causative agent of Alzheimer’s disease, or secreted amyloid precursor protein-alpha (sAPPα), which promotes neuroprotection, neurotrophism, neurogenesis and synaptic plasticity. The underlying molecular mechanisms recruited by sAPPα that underpin these considerable cellular effects are not well elucidated. As these effects are enduring, we hypothesised that regulation of gene expression may be of importance and examined temporally specific gene networks and pathways induced by sAPPα in rat hippocampal organotypic slice cultures. Slices were exposed to 1 nM sAPPα or phosphate buffered saline for 15 min, 2 h or 24 h and sAPPα-associated gene expression profiles were produced for each time-point using Affymetrix Rat Gene 1.0 ST arrays (moderated t-test using Limma: p-lt;-.05, and fold change?±-.15). Results Treatment of organotypic hippocampal slice cultures with 1 nM sAPPα induced temporally distinct gene expression profiles, including mRNA and microRNA associated with Alzheimer’s disease. Having demonstrated that treatment with human recombinant sAPPα was protective against N-methyl d-aspartate-induced toxicity, we next explored the sAPPα-induced gene expression profiles. Ingenuity Pathway Analysis predicted that short-term exposure to sAPPα elicited a multi-level transcriptional response, including upregulation of immediate early gene transcription factors (AP-1, Egr1), modulation of the chromatin environment, and apparent activation of the constitutive transcription factors CREB and NF-κB. Importantly, dynamic regulation of NF-κB appears to be integral to the transcriptional response across all time-points. In contrast, medium and long exposure to sAPPα resulted in an overall downregulation of gene expression. While these results suggest commonality between sAPPα and our previously reported analysis of plasticity-related gene expression, we found little crossover between these datasets. The gene networks formed following medium and long exposure to sAPPα were associated with inflammatory response, apoptosis, neurogenesis and cell survival; functions likely to be the basis of the neuroprotective effects of sAPPα. Conclusions Our results demonstrate that sAPPα rapidly and persistently regulates gene expression in rat hippocampus. This regulation is multi-level, temporally specific and is likely to underpin the neuroprotective effects of sAPPα.

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