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Journal of Translational Medicine
Published in: Journal of Translational Medicine 1/2018

Open Access 01-12-2018 | Research

Serum and thyroid tissue level of let-7b and their correlation with TRAb in Graves’ disease

Authors: Xinxin Chen, Fengjiao Huang, Yicheng Qi, Mengxi Zhou, Qinglei Yin, Ying Peng, Yulin Zhou, Guang Ning, Shu Wang

Published in: Journal of Translational Medicine | Issue 1/2018

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Abstract

Background

Abnormal microRNAs (miRNAs) were reported to be involved in the mechanism of Graves’ disease (GD). Dysregulated miRNAs may be overlapping in different cells and can be secreted to circulation. We chose miRNAs which were previously reported to be differentially expressed in peripheral blood mononuclear cells (PBMCs) in patients with GD with different disease stage, detected the expression of those miRNAs in serum, corroborated the findings in thyroid tissue, and validated the target gene in vitro to investigate the possible role of circulating miRNAs in GD.

Methods

A total of 54 individuals with untreated GD, 12 individuals with GD in remission and 14 disease-free controls were enrolled. The expression of miR-142-3p, miR-154-3p, miR-431-3p, miR-590-5p, and let-7b was detected in the serum. Ten thyroid tissue samples from patients with GD and six disease-free thyroid samples were used for further validation. The potential target genes were identified and validated in vitro.

Results

miR-142-3p, miR-154-3p, miR-431-3p, miR-590-5p, and let-7b were present in serum and two of them (miR-142-3p and let-7b) were significantly increased in serum of patients with untreated GD (for serum miR-142-3p, P = 0.033, for serum let-7b, P = 0.026) and gradually decreased to normal levels in patients with GD in remission. Correlation analysis showed that let-7b level was strongly correlated with TRAb level (r = 0.305, P = 0.001). let-7b directly inhibited promyelocytic leukemia zinc finger (PLZF) expression and increased the expression of TSHR in thyroid cells in vitro. Furthermore, let-7b levels in GD thyroid tissue were found to be inversely correlated with PLZF levels (r = − 0.849, P = 0.033). Decreased PLZF and increased TSHR was validated in thyroid tissue in patients with GD.

Conclusions

The present study confirmed that a portion of miRNAs in PBMCs were also presented and differentially expressed in serum and thyroid tissue. Upregulated in all these three compartments, let-7b may be used as a disease biomarker and therapeutic targets in patients with GD. Circulating let-7b had a strong correlation with disease severity and let-7b may participate in the production of TRAb via targeting PLZF in patients with GD.

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Metadata
Title
Serum and thyroid tissue level of let-7b and their correlation with TRAb in Graves’ disease
Authors
Xinxin Chen
Fengjiao Huang
Yicheng Qi
Mengxi Zhou
Qinglei Yin
Ying Peng
Yulin Zhou
Guang Ning
Shu Wang
Publication date
01-12-2018
Publisher
BioMed Central
Published in
Journal of Translational Medicine / Issue 1/2018
Electronic ISSN: 1479-5876
DOI
https://doi.org/10.1186/s12967-018-1565-9

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