Expression profiling of notch signalling pathway and gamma-secretase activity in the brain of Ts1Cje mouse model of down syndrome
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 (NIC...
| Main Authors: | , , , , , , , , , |
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| Format: | Article |
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Springer
2019
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| Online Access: | http://psasir.upm.edu.my/id/eprint/79827/ |
| _version_ | 1848858767291056128 |
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| author | Md Yusof, Hadri Hadi Lee, Han Chung Mohamed Seth, Eryse Amira Wu, Xiangzhong Hewitt, Chelsee A. Scott, Hamish S. Cheah, Pike See Li, Yue Ming Chau, De Ming Ling, King Hwa |
| author_facet | Md Yusof, Hadri Hadi Lee, Han Chung Mohamed Seth, Eryse Amira Wu, Xiangzhong Hewitt, Chelsee A. Scott, Hamish S. Cheah, Pike See Li, Yue Ming Chau, De Ming Ling, King Hwa |
| author_sort | Md Yusof, Hadri Hadi |
| building | UPM Institutional Repository |
| collection | Online Access |
| description | 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. |
| first_indexed | 2025-11-15T12:18:40Z |
| format | Article |
| id | upm-79827 |
| institution | Universiti Putra Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-15T12:18:40Z |
| publishDate | 2019 |
| publisher | Springer |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | upm-798272022-11-11T05:21:15Z http://psasir.upm.edu.my/id/eprint/79827/ Expression profiling of notch signalling pathway and gamma-secretase activity in the brain of Ts1Cje mouse model of down syndrome Md Yusof, Hadri Hadi Lee, Han Chung Mohamed Seth, Eryse Amira Wu, Xiangzhong Hewitt, Chelsee A. Scott, Hamish S. Cheah, Pike See Li, Yue Ming Chau, De Ming Ling, King Hwa 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. Springer 2019 Article PeerReviewed Md Yusof, Hadri Hadi and Lee, Han Chung and Mohamed Seth, Eryse Amira and Wu, Xiangzhong and Hewitt, Chelsee A. and Scott, Hamish S. and Cheah, Pike See and Li, Yue Ming and Chau, De Ming and Ling, King Hwa (2019) Expression profiling of notch signalling pathway and gamma-secretase activity in the brain of Ts1Cje mouse model of down syndrome. Journal of Molecular Neuroscience, 67 (4). pp. 632-642. ISSN 0895-8696; ESSN: 1559-1166 https://link.springer.com/article/10.1007/s12031-019-01275-2 10.1007/s12031-019-01275-2 |
| spellingShingle | Md Yusof, Hadri Hadi Lee, Han Chung Mohamed Seth, Eryse Amira Wu, Xiangzhong Hewitt, Chelsee A. Scott, Hamish S. Cheah, Pike See Li, Yue Ming Chau, De Ming Ling, King Hwa Expression profiling of notch signalling pathway and gamma-secretase activity in the brain of Ts1Cje mouse model of down syndrome |
| title | Expression profiling of notch signalling pathway and gamma-secretase activity in the brain of Ts1Cje mouse model of down syndrome |
| title_full | Expression profiling of notch signalling pathway and gamma-secretase activity in the brain of Ts1Cje mouse model of down syndrome |
| title_fullStr | Expression profiling of notch signalling pathway and gamma-secretase activity in the brain of Ts1Cje mouse model of down syndrome |
| title_full_unstemmed | Expression profiling of notch signalling pathway and gamma-secretase activity in the brain of Ts1Cje mouse model of down syndrome |
| title_short | Expression profiling of notch signalling pathway and gamma-secretase activity in the brain of Ts1Cje mouse model of down syndrome |
| title_sort | expression profiling of notch signalling pathway and gamma-secretase activity in the brain of ts1cje mouse model of down syndrome |
| url | http://psasir.upm.edu.my/id/eprint/79827/ http://psasir.upm.edu.my/id/eprint/79827/ http://psasir.upm.edu.my/id/eprint/79827/ |