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Adipose-Derived Stem Cells Suppress Inflammation Induced by IL-1β through Down-Regulation of P2X7R Mediated by miR-373 in Chondrocytes of Osteoarthritis

  • Jin, Rilong (Department of Orthopedics Surgery, The First Affiliated Hospital, College of Medical Zhejiang University) ;
  • Shen, Miaoda (Department of Orthopedics Surgery, The First Affiliated Hospital, College of Medical Zhejiang University) ;
  • Yu, Liedao (Department of Orthopedics Surgery, The First Affiliated Hospital, College of Medical Zhejiang University) ;
  • Wang, Xuanwei (Department of Orthopedics Surgery, The First Affiliated Hospital, College of Medical Zhejiang University) ;
  • Lin, Xiangjin (Department of Orthopedics Surgery, The First Affiliated Hospital, College of Medical Zhejiang University)
  • Received : 2016.12.26
  • Accepted : 2017.02.07
  • Published : 2017.03.31

Abstract

Adipose-derived stem cells (ADSCs) were previously considered to have an anti-inflammatory effect, and Interleukin-$1{\beta}$ ($IL-1{\beta}$) was found to be a pro-inflammatory factor in chondrocytes, but the mechanism underlying ADSCs and $IL-1{\beta}$ is unclear. In this study, we investigate whether P2X7 receptor (P2X7R) signalling, regulated by microRNA 373 (miR-373), was involved in the ADSCs and $IL-1{\beta}$ mediated inflammation in osteoarthritis (OA). Chondrocytes were collected from 20 OA patients and 20 control participants, and ADSCs were collected from patients who had undergone abdominal surgery. The typical surface molecules of ASDCs were detected by flow cytometry. The level of nitric oxide (NO) was determined by Griess reagent. Concentrations of prostaglandin E2 (PGE2), interleukin 6 (IL-6), matrix metallopeptidase 3 (MMP-3) were detected by enzyme-linked immunosorbent assay (ELISA). The expressions of IL-6, MMP-3, miR-373 and P2X7R were determined by real-time polymerase chain reaction (PCR), and Western blot was used to detect the protein expression of P2X7R. The typical potential characters of ADSCs were verified. In chondrocytes or OA tissues, the miR-373 expression level was decreased, but the P2X7R expression was increased. $IL-1{\beta}$ stimulation increased the level of inflammatory factors in OA chondrocytes, and ADSCs co-cultured with $IL-1{\beta}$-stimulated chondrocytes decreased the inflammation. OA chondrocytes transfected with the miR-373 inhibitor increased the inflammation level. The miR-373 mimic suppressed the inflammation by targeting P2X7R and regulated its expression, while its effect was reversed by overexpression of P2X7R. $IL-1{\beta}$ induced inflammation in OA chondrocytes, while ADSCs seemed to inhibit the expression of P2X7R that was regulated by miR-373 and involved in the anti-inflammatory process in OA.

Keywords

adipose-derived stem cells;chondrocytes;miR-373;osteoarthritis;P2X7R

Acknowledgement

Supported by : Education Bureau of Zhejiang Province, Health Department of Zhejiang Province

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