Abstract
A previous study indicated that long non-coding RNA X-inactive-specific transcript (XIST) promoted ethanol-induced HSCs autophagy and activation. Considering the critical role of HSC activation in hepatic fibrosis, the aim of the present study was to reveal the exact role of XIST in liver fibrosis and its underlying mechanism. The expression of XIST in the liver from CCL4-induced mice and control mice as well as human fibrotic liver tissue and healthy liver tissue was examined. The mitochondrial reactive oxygen species (mtROS), mitochondrial membrane potential (MMP), and mitochondrial morphology were measured to assess the mitochondrial damage. The relationship between XIST and miR-539-3p as well as between miR-539-3p and ADAMTS5 was verified by a dual-luciferase reporter assay. The expression levels of HSCs activation markers were examined by Western blot. The results showed that the XIST was upregulated in fibrotic liver tissue, and overexpression of XIST induced mitochondrial dysfunction in hepatocytes. miR-539-3p directly targeted XIST, and ADAMTS5 mRNA was a downstream target of miR-539-3p. Knockdown of miR-539-3p led to an increased mitochondrial damage in hepatocytes in terms of reduced mitochondrial length, decreased MMP, and increased ROS production. However, the depletion of ADAMTS5 reversed the regulatory effect of XIST on mitochondrial damage in hepatocytes and the activation of HSCs. Our study revealed the critical role of the XIST/miR-539-3p/ADAMTS5 axis in regulating mitochondrial damage in hepatocytes and the activation of HSCs. This study may provide a potential therapeutic strategy for the treatment of liver fibrosis.
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Abbreviations
- ADAMTS5:
-
A disintegrin and metalloproteinase with thrombospondin type 1 motifs, member 5
- DAMPs:
-
Endogenous damage-associated molecular patterns
- ECM:
-
Extracellular matrix
- H&E:
-
Hematoxylin & eosin
- HSCs:
-
Hepatic stellate cells
- IHC:
-
Immunohistochemistry
- mtDNA:
-
Mitochondrial DNA
- mtROS:
-
Reactive oxygen species production in mitochondrial
- microRNA:
-
MiRNA
- PGC-1α:
-
Peroxisome proliferator-activated receptor gamma coactivator 1-alpha
- ROS:
-
Reactive oxygen species
- RT-qPCR:
-
Real-time polymerase chain reaction
- α-SMA:
-
Anti-alpha smooth muscle actin
- SOD:
-
Superoxide dismutase (SOD)
- TFAM:
-
Mitochondrial transcription factor A
- TGF-β:
-
Transforming growth factor beta
- TUNEL:
-
Terminal deoxynucleotidyl transferase dUTP nick-end labeling
- XIST:
-
X-inactive-specific transcript
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This work was supported by Science and Technology Research Project of Jiangxi Education Department (No. GJJ190793) and Scientific Research Project of Gannan Medical University (No. ZD201804).
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X-JW contributed to concepts, design, funding acquisition, and supervision. YX contributed to methodology and experimental studies. X-XG contributed to writing- original draft preparation, writing- reviewing, and editing. H-YZ contributed to data acquisition and data analysis. L-XH contributed to experimental studies.
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The study has been approved by the local Ethical Committee of the First Affiliated Hospital of Gannan Medical College. All patients provided written informed consent for the storage of liver tissue samples.
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11010_2022_4506_MOESM1_ESM.tif
Figure S1. Knockdown of ADAMTS5 did not show any impact on XIST or miR-539-3p expression. The (A) mRNA and (B) protein expressions of ADAMTS5 were measured by RT-PCR or western blot after cells transfected with sh-NC and sh-ADAMTS5. The expressions of (C) XIST and (D) miR-539-3p were measured by RT-PCR after cells transfected with sh-NC or sh-ADAMTS5. **p < 0.01. All data were obtained from at least three replicate experiments. (TIF 472 kb)
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Wu, XJ., Xie, Y., Gu, XX. et al. LncRNA XIST promotes mitochondrial dysfunction of hepatocytes to aggravate hepatic fibrogenesis via miR-539-3p/ADAMTS5 axis. Mol Cell Biochem 478, 291–303 (2023). https://doi.org/10.1007/s11010-022-04506-0
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DOI: https://doi.org/10.1007/s11010-022-04506-0