Abstract |
MicroRNAs ( miRNAs) are abundantly expressed in the brain and play an important role in disorders of the brain, including Alzheimer's diseases (AD). Growing body of evidence suggests that the TGF-β signaling pathway plays a key role in the pathogenesis of AD. However, it is unclear whether miRNAs involved in AD pathogenesis by regulating TGF-β signaling. Here we found that miR-106b and TGF-β type II receptor (TβR II) were aberrantly expressed in APPswe/PS∆E9 mice (a double transgenic mouse model for AD). Sequence analysis revealed two putative binding sites for miR-106b in the 3' UTR of the TβR II mRNA. Our results showed that the expression of miR-106b was inversely correlated with TβR II protein levels and miR-106b can directly inhibit the TβR II translation in vitro. After induced neurodifferentiation with all-trans retinoic acid, we observed significant neurodegeneration in SH-SY5Y cells stably transfected with miR-106b. Western blot analysis revealed unchanged total Smad2/3 protein levels, but reduced phospho-Smad2/3 (p-Smad2/3) and increased Smad6/7 protein levels in the miR-106b stably transfected cell line. Exposure of SH-SY5Y cells to Aβ42 oligomers led to the expression of miR-106b was first increased and then decreased and TβR II levels reduced. Our in vitro results suggested that Aβ42 oligomer-induced miR-106b leads to impairment in TGF-β signaling through TβR II, concomitant with retinoic acid-induced neurodegeneration in SH-SY5Y cells. These results show that TβR II is a functional target of miR-106b and that miR-106b may influence TGF-β signaling, thereby contributing to the pathogenesis of AD.
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Authors | Hailin Wang, Jialin Liu, Yuanyuan Zong, Yanfeng Xu, Wei Deng, Hua Zhu, Ying Liu, Chunmei Ma, Lan Huang, Lianfeng Zhang, Chuan Qin |
Journal | Brain research
(Brain Res)
Vol. 1357
Pg. 166-74
(Oct 21 2010)
ISSN: 1872-6240 [Electronic] Netherlands |
PMID | 20709030
(Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
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Copyright | Copyright © 2010 Elsevier B.V. All rights reserved. |
Chemical References |
- MicroRNAs
- Mirn106 microRNA, mouse
- Receptors, Transforming Growth Factor beta
- Smad Proteins
- Protein Serine-Threonine Kinases
- Receptor, Transforming Growth Factor-beta Type II
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Topics |
- Alzheimer Disease
(genetics, metabolism)
- Animals
- Blotting, Western
- Brain
(metabolism)
- Cell Line
- Cell Survival
(physiology)
- Cells, Cultured
- Disease Models, Animal
- Mice
- Mice, Transgenic
- MicroRNAs
(genetics)
- Neurons
(metabolism)
- Protein Serine-Threonine Kinases
(genetics, metabolism)
- Receptor, Transforming Growth Factor-beta Type II
- Receptors, Transforming Growth Factor beta
(genetics, metabolism)
- Reverse Transcriptase Polymerase Chain Reaction
- Smad Proteins
(genetics, metabolism)
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