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29-kDa FN-f inhibited autophagy through modulating localization of HMGB1 in human articular chondrocytes

  • Hwang, Hyun Sook (Division of Rheumatology, Department of Internal Medicine, Hallym University Sacred Heart Hospital) ;
  • Choi, Min Ha (Division of Rheumatology, Department of Internal Medicine, Hallym University Sacred Heart Hospital) ;
  • Kim, Hyun Ah (Division of Rheumatology, Department of Internal Medicine, Hallym University Sacred Heart Hospital)
  • Received : 2018.03.19
  • Accepted : 2018.05.04
  • Published : 2018.10.31

Abstract

Fibronectin fragments found in the synovial fluid of patients with osteoarthritis (OA) induce the catabolic responses in cartilage. Nuclear high-mobility group protein Box 1 (HMGB1), a damage-associated molecular pattern, is responsible for the regulation of signaling pathways related to cell death and survival in response to various stimuli. In this study, we investigated whether changes induced by 29-kDa amino-terminal fibronectin fragment (29-kDa FN-f) in HMGB1 expression influences the pathogenesis of OA via an HMGB1-modulated autophagy signaling pathway. Human articular chondrocytes were enzymatically isolated from articular cartilage. The level of mRNA was measured by quantitative real-time PCR. The expression of proteins was examined by western blot analysis, immnunofluorescence assay, and enzyme-linked immunosorbent assay. Interaction of proteins was evaluated by immunoprecipitation. The HMGB1 level was significantly lower in human OA cartilage than in normal cartilage. Although 29-kDa FN-f significantly reduced the HMGB1 expression at the mRNA and protein levels 6 h after treatment, the cytoplasmic level of HMGB1 was increased in chondrocytes treated with 29-kDa FN-f, which significantly inhibited the interaction of HMGB1 with Beclin-1, increased the interaction of Bcl-2 with Beclin-1, and decreased the levels of Beclin-1 and phosphorylated Bcl-2. In addition, the level of microtubule-associated protein 1 light chain 3-II, an autophagy marker, was down-regulated in chondrocytes treated with 29-kDa FN-f, whereas the effect was antagonized by mTOR knockdown. Furthermore, prolonged treatment with 29-kDa FN-f significantly increased the release of HMGB1 into the culture medium. These results demonstrated that 29-kDa FN-f inhibits chondrocyte autophagy by modulating the HMGB1 signaling pathway.

Keywords

Autophagy;Chondrocyte;Fibronectin fragment;HMGB1;Osteoarthritis

Acknowledgement

Supported by : Ministry of Health & Welfare, National Research Foundation (NRF), Hallym University

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