Abstract
Intervertebral disc degeneration (IDD) is characterised by nucleus pulposus (NP) loss and extracellular matrix (ECM) degeneration. Circular RNAs (circRNAs) have been reported to be dysregulated during IDD progression. Recently, reports showed that hsa_circ_0040039 was increased in degenerated lumbar disc samples. The aim of this study was to explore the specific role and underlying mechanisms of hsa_circ_0040039 in IDD. The expression of hsa_circ_0040039 was investigated in NP tissues of IDD patients. IL-1β was used to treat NP cells to construct an IDD in vitro model. Overexpression and loss-of-function assays and bioinformatic analysis were performed to evaluate the role and potential mechanism of hsa_circ_0040039 during IDD progression. Hsa_circ_0040039 expression was increased about 2 folds in NP tissues compared with normal tissues and IL-1β-stimulated NP cells also presented hsa_circ_0040039 upregulation, and its overexpression promoted cell proliferation and ECM degeneration. The depletion of hsa_circ_0040039 had the opposite effects. Based on bioinformatics prediction, Luciferase assay, PCR and Western blot, our study verified that hsa_circ_0040039 directly bond to miR-146b-3p, then mediated its targeted MMP2 and PCNA. Moreover, the overexpression of miR-146b-3p and the silence of MMP2 or PCNA, partially abolished the effect of hsa_circ_0040039 on IL-1β-stimulated NPs. Hsa_circ_0040039 may participate in IDD development by mediating the repair and regeneration of NPs through upregulation MMP2 and PCNA mediated by miR-146b-3p.
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The data supporting the conclusions of this article are included within the article.
Abbreviations
- IDD :
-
Intervertebral disc degeneration
- NP :
-
Nucleus pulposus
- ECM :
-
Extracellular matrix
- IL-1β :
-
Interleukin-1β
- MMPs :
-
Matrix metalloproteinases
- HNPCs :
-
Human nucleus pulposus cells
- ov-circ :
-
Overexpression vector of hsa_circ_0040039
- eIF4A3 :
-
Eukaryotic translation initiation factor 4A3
- PCNA :
-
Proliferating cell nuclear antigen
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Funding
This work was supported by Key Research and Development Program of Shaanxi (2023-YBSF-617).
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Xiaochen Fan contributed to the conception of the study; Yi Cao and Haidong Deng performed the experiment; Jing Jia contributed significantly to analysis and manuscript preparation; Liang Li performed the data analyses and wrote the manuscript; Xiaochen Fan helped perform the analysis with constructive discussions.
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Li, L., Cao, Y., Deng, H. et al. EIF4A3-Induced Upregulation of hsa_circ_0040039 is a Biomarker and Aggravates IL-1β-Stimulated Intervertebral Disc Degeneration. Appl Biochem Biotechnol 195, 4292–4307 (2023). https://doi.org/10.1007/s12010-023-04334-y
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DOI: https://doi.org/10.1007/s12010-023-04334-y