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Sci Rep. 2017 Mar 16;7(1):202. doi: 10.1038/s41598-017-00150-7.

Reciprocal regulation of γ-globin expression by exo-miRNAs: Relevance to γ-globin silencing in β-thalassemia major.

Author information

1
Graduate Institute of Clinical Medical Science, China Medical University, Taichung, 40402, Taiwan.
2
Department of Pediatric Dentistry, China Medical University Hospital, Taichung, 40402, Taiwan.
3
School of Dentistry, China Medical University, Taichung, 40402, Taiwan.
4
Department of Life Sciences, National Chung-Hsing University, Taichung, 40402, Taiwan.
5
Department of Hematology-oncology, Children's Hospital of China Medical University, Taichung, 40402, Taiwan.
6
Division of Cardiology, Department of Medicine, China Medical University Hospital, Taichung, 40402, Taiwan.
7
Division of Nephrology, Department of Medicine, China Medical University Hospital, Taichung, 40402, Taiwan.
8
Thalassemia Research Institute, The First Affiliated Hospital, Guangxi Medical University, Guangxi Zhuang Autonomous Region, 530021, China.
9
Department of Hematology-oncology, Children's Hospital of China Medical University, Taichung, 40402, Taiwan. pct@mail.cmuh.org.tw.
10
Graduate Institute of Clinical Medical Science, China Medical University, Taichung, 40402, Taiwan. cyli168@gmail.com.
11
Department of Anesthesiology, China Medical University Hospital, Taichung, 40402, Taiwan. cyli168@gmail.com.

Abstract

Induction of fetal hemoglobin (HbF) is a promising strategy in the treatment of β-thalassemia major (β-TM). The present study shows that plasma exosomal miRNAs (exo-miRs) are involved in γ-globin regulation. Exosomes shuttle miRNAs and mediate cell-cell communication. MiRNAs are regulators of biological processes through post-transcriptional targeting. Compared to HD (Healthy Donor), β-TM patients showed increased levels of plasma exosomes and the majority of exosomes had cellular origin from CD34+ cells. Further, HD and β-TM exosomes showed differential miRNA expressions. Among them, deregulated miR-223-3p and miR-138-5p in β-TM exosomes and HD had specific targets for γ-globin regulator and repressor respectively. Functional studies in K562 cells showed that HD exosomes and miR-138-5p regulated γ-globin expression by targeting BCL11A. β-TM exosomes and miR-223-3p down regulated γ-globin expression through LMO2 targeting. Importantly, miR-223-3p targeting through sponge repression resulted in γ-globin activation. Further, hnRNPA1 bound to stem-loop structure of pre-miR-223 and we found that hnRNPA1 knockdown or mutagenesis at miR-223-3p stem-loop sequence resulted in less mature exo-miR-223-3p levels. Altogether, the study shows for the first time on the important clinical evidence that differentially expressed exo-miRNAs reciprocally control γ-globin expressions. Further, the hnRNPA1-exo-miR-223-LMO2 axis may be critical to γ-globin silencing in β-TM.

PMID:
28303002
PMCID:
PMC5427890
DOI:
10.1038/s41598-017-00150-7
[Indexed for MEDLINE]
Free PMC Article

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