Sequencing and bioinformatics analysis of miRNA from rat endplate chondrogenic exosomes

Chen,Xue-Wu; Li,Qiu-Wei; Wang,Hong

doi:10.3892/etm.2023.11966

Sequencing and bioinformatics analysis of miRNA from rat endplate chondrogenic exosomes

Authors:
- Xue-Wu Chen
- Qiu-Wei Li
- Hong Wang
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Affiliations: Department of Spinal Orthopedics, Yijishan Hospital of Wannan Medical College, Wuhu, Anhui 241000, P.R. China
Published online on: April 20, 2023 https://doi.org/10.3892/etm.2023.11966
Article Number: 267
Copyright: © Chen et al. This is an open access article distributed under the terms of Creative Commons Attribution License.

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Abstract

Exosomes have a key role in various diseases, such as arthritis, heart disease and respiratory disease. Exosomes from various sources have also been indicated to improve intervertebral disc degeneration. However, the role of endplate chondrogenic exosomes in intervertebral disc degeneration has remained largely elusive. The aim of the present study was to compare exosomal microRNA (miRNA) expression patterns in endplate chondrocytes before and after degeneration, and their potential roles in the pathogenesis of intervertebral disc degeneration (IVDD). Endplate chondrocytes were extracted from rats and cultured to obtain pre‑ and post‑degeneration chondrocytes. Exosomes were obtained from the chondrocytes by centrifugation. The two groups of exosomes were subjected to small RNA sequencing, miRNA identification, novel miRNA prediction, quantitative analysis of miRNA expression and differentially expressed (DE) miRNA screening, in addition to miRNA target gene (TG) prediction and TG functional annotation and enrichment analysis. The percentage of miRNAs isolated from the exosomes before and after degeneration was found to differ. A total of 58 DE miRNAs were analyzed, the expression levels of which were significantly different post‑degeneration compared with pre‑degeneration. Cell experiments were also performed, in which the exosomes were co‑cultured with nucleus pulposus (NP) cells. The results indicated that the chondrocyte‑derived exosomes were taken up by the NP cells and influenced the expression of aggrecan and collagen 1A and 2A, suggesting that they may inhibit IVDD via their action on NP cells. The specific miRNAs present in exosomes during IVDD may be used to develop new targets for the treatment and diagnosis of this condition. DE exosomal miRNAs derived from endplate cartilage pre‑ and post‑degeneration may be associated with the risk of IVDD and could help to distinguish patients with IVDD. Furthermore, the expression of certain miRNAs may be associated with disease progression, which may contribute to understanding the pathophysiology of IVDD from an epigenetic perspective.

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