期刊
BRAIN RESEARCH
卷 1357, 期 -, 页码 166-174出版社
ELSEVIER
DOI: 10.1016/j.brainres.2010.08.023
关键词
MicroRNA; miR-106b; Alzheimer's disease; T beta R II; APPswe/PS Delta E9 mouse
资金
- Ministry of Health, China [200802036]
- National Science and Technology Major Projects [2009ZX09501-026]
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-beta signaling pathway plays a key role in the pathogenesis of AD. However, it is unclear whether miRNAs involved in AD pathogenesis by regulating TGF-beta signaling. Here we found that miR-106b and TGF-beta type II receptor (T beta R II) were aberrantly expressed in APPswe/PS Delta 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 T beta R II mRNA. Our results showed that the expression of miR-106b was inversely correlated with T beta R II protein levels and miR-106b can directly inhibit the T beta R II translation in vitro. After induced neurodifferentiation with all-trans retinoic acid, we observed significant neurodegeneration in SH-SYSY 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 A beta 42 oligomers led to the expression of miR-106b was first increased and then decreased and T beta R II levels reduced. Our in vitro results suggested that A beta 42 oligomer-induced miR-106b leads to impairment in TGF-beta signaling through T beta R II, concomitant with retinoic acid-induced neurodegeneration in SH-SYSY cells. These results show that T beta R II is a functional target of miR-106b and that miR-106b may influence TGF-beta signaling, thereby contributing to the pathogenesis of AD. (C) 2010 Elsevier B.V. All rights reserved.
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