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Journal of Molecular Neuroscience

, Volume 67, Issue 4, pp 632–642 | Cite as

Expression Profiling of Notch Signalling Pathway and Gamma-Secretase Activity in the Brain of Ts1Cje Mouse Model of Down Syndrome

  • Hadri Hadi Yusof
  • Han-Chung Lee
  • Eryse Amira Seth
  • Xiangzhong Wu
  • Chelsee A. Hewitt
  • Hamish S Scott
  • Pike-See Cheah
  • Yue-Ming Li
  • De-Ming Chau
  • King-Hwa LingEmail author
Article

Abstract

Notch signalling pathway is involved in the proliferation of neural progenitor cells (NPCs), to inhibit neuronal cell commitment and to promote glial cell fate. Notch protein is cleaved by gamma-secretase, a multisubunit transmembrane protein complex that releases the Notch intracellular domain (NICD) and subsequently activates the downstream targets. Down syndrome (DS) individuals exhibit an increased number of glial cells (particularly astrocytes), and reduced number of neurons suggesting the involvement of Notch signalling pathway in the neurogenic-to-gliogenic shift in DS brain. Ts1Cje is a DS mouse model that exhibit similar neuropathology to human DS individuals. To date, the spatiotemporal gene expression of the Notch and gamma-secretase genes have not been characterised in Ts1Cje mouse brain. Understanding the expression pattern of Notch and gamma-secretase genes may provide a better understanding of the underlying mechanism that leads to the shift. Gene expression analysis using RT-qPCR was performed on early embryonic and postnatal development of DS brain. In the developing mouse brain, mRNA expression analysis showed that gamma-secretase members (Psen1, Pen-2, Aph-1b, and Ncstn) were not differentially expressed. Notch2 was found to be downregulated in the developing Ts1Cje brain samples. Postnatal gene expression study showed complex expression patterns and Notch1 and Notch2 genes were found to be significantly downregulated in the hippocampus at postnatal day 30. Results from RT-qPCR analysis from E15.5 neurosphere culture showed an increase of expression of Psen1, and Aph-1b but downregulation of Pen-2 and Ncstn genes. Gamma-secretase activity in Ts1Cje E15.5 neurospheres was significantly increased by fivefold. In summary, the association and the role of Notch and gamma-secretase gene expression throughout development with neurogenic-to-gliogenic shift in Ts1Cje remain undefined and warrant further validation.

Keywords

Notch signalling pathway Gamma-secretase Down syndrome Neurogenesis Gliogenesis Ts1Cje Mouse models Brain Gene expression 

Notes

Author Contributions

Conceived and designed the experiment: HHY, KHL, DMC. Prepared and performed enzyme activity study: HHY, DMC, XW, YML. Performed, analysed and critically discussed the expression dataset: HHY, HCL, EAS, CAH, HSS, DMC, KHL. Procured and prepared samples and involved in data analysis: HHY, EAS, HCL, CAH. Wrote the first draft of the manuscript: HHY, KHL. Contributed to the writing of the manuscript: HHY, PSC, KHL. Developed structure and arguments for paper: HHY, EAS, DMC, KHL. All authors agree with the manuscript results and conclusion. All authors reviewed and approved the final manuscript.

Funding Information

This work was supported in part by funding from the MOSTI Science Fund (02-01-04-SF2336) awarded to KHL and MOHE Fundamental Research Grant Scheme (04-01-15-1663FR) awarded to PSC. HSS is supported by the Cancer Council SA’s Beat Cancer Project on behalf of it’s donors and the State Government of South Australia through the Department of Health. HHY and HCL were supported by MyBrain15 postgraduate scholarship programme by the Ministry of Higher Education (MOE), Malaysia.

Compliance with Ethical Standards

Conflict of Interest

All the authors declare that they have no conflicts of interest.

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  • Hadri Hadi Yusof
    • 1
    • 2
  • Han-Chung Lee
    • 1
    • 2
  • Eryse Amira Seth
    • 1
    • 3
  • Xiangzhong Wu
    • 4
  • Chelsee A. Hewitt
    • 5
  • Hamish S Scott
    • 6
    • 7
    • 8
    • 9
    • 10
  • Pike-See Cheah
    • 1
    • 3
  • Yue-Ming Li
    • 4
  • De-Ming Chau
    • 1
    • 2
  • King-Hwa Ling
    • 1
    • 2
    Email author
  1. 1.Genetics & Regenerative Medicine Research Centre (GRMRC), Faculty of Medicine and Health SciencesUniversiti Putra MalaysiaSerdangMalaysia
  2. 2.Department of Biomedical Science, Faculty of Medicine and Health SciencesUniversiti Putra MalaysiaSerdangMalaysia
  3. 3.Department of Human Anatomy, Faculty of Medicine and Health SciencesUniversiti Putra MalaysiaSerdangMalaysia
  4. 4.Chemical Biology Program, Memorial Sloan Kettering Cancer CenterNew YorkUSA
  5. 5.Department of PathologyThe Peter MacCallum Cancer CentreEast MelbourneAustralia
  6. 6.Department of Genetics and Molecular Pathology, Centre for Cancer BiologyAn Alliance Between SA Pathology and the University of South Australia, SA PathologyAdelaideAustralia
  7. 7.School of Medicine, Faculty of Health SciencesUniversity of AdelaideAdelaideAustralia
  8. 8.School of Pharmacy and Medical ScienceUniversity of South AustraliaAdelaideAustralia
  9. 9.School of Biological SciencesUniversity of AdelaideAdelaideAustralia
  10. 10.Australian Cancer Research Foundation Genomics Facility, Centre for Cancer Biology, SA PathologyAdelaideAustralia

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