Abstract |
Overexpression of integrins in dermal fibroblasts is thought to play a key role in the pathogenesis of systemic sclerosis (SSc), but the mechanism is unknown. We evaluated the possibility that microRNAs ( miRNAs) are involved in the regulation of integrin β3 in these cells. The miRNA expression profile was determined by miRNA PCR array and real-time PCR. Protein expression of integrin β3 was determined by immunoblotting. In vivo detection of miRNA in paraffin section was performed by in situ hybridization. miR-150 expression was decreased in SSc fibroblasts both in vivo and in vitro. The transfection of miR-150 inhibitor into normal fibroblasts induced expression of integrin β3, phosphorylated Smad3, and type I collagen, whereas forced overexpression of the miRNA resulted in their down-regulation in SSc fibroblasts. Treatment of SSc fibroblasts with 5-AdC revealed that miR-150 down-regulation in these cells is caused by DNA methylation. In addition, we found that miR-150 is detectable and quantitative in serum. Serum miR-150 levels were decreased in SSc patients, and the SSc patients with lower serum miR-150 levels tended to have more severe clinical manifestations. miR-150 may play an important role in the pathogenesis of SSc via overexpression of integrin β3. Investigation of the regulatory mechanisms of tissue fibrosis by miR-150 could lead to development of new diagnostic tools and new treatments using miRNA.
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Authors | Noritoshi Honda, Masatoshi Jinnin, Tomomi Kira-Etoh, Katsunari Makino, Ikko Kajihara, Takamitsu Makino, Satoshi Fukushima, Yuji Inoue, Yoshinobu Okamoto, Minoru Hasegawa, Manabu Fujimoto, Hironobu Ihn |
Journal | The American journal of pathology
(Am J Pathol)
Vol. 182
Issue 1
Pg. 206-16
(Jan 2013)
ISSN: 1525-2191 [Electronic] United States |
PMID | 23159943
(Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
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Copyright | Copyright © 2013 American Society for Investigative Pathology. Published by Elsevier Inc. All rights reserved. |
Chemical References |
- Collagen Type I
- Integrin beta3
- MIRN150 microRNA, human
- MicroRNAs
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Topics |
- Animals
- Case-Control Studies
- Cells, Cultured
- Collagen Type I
(biosynthesis, genetics)
- DNA Methylation
- Down-Regulation
(physiology)
- Female
- Fibroblasts
(metabolism)
- Gene Expression Profiling
(methods)
- Humans
- Integrin beta3
(biosynthesis, genetics, physiology)
- Male
- Mice
- Mice, Inbred C57BL
- MicroRNAs
(biosynthesis, blood, genetics)
- Middle Aged
- Real-Time Polymerase Chain Reaction
(methods)
- Scleroderma, Systemic
(genetics, metabolism, pathology)
- Skin
(metabolism, pathology)
- Transfection
- Up-Regulation
(physiology)
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