Inhibitory effects of ubiquitination of synoviolin by PADI4

  • Authors:
    • Satoko Aratani
    • Hidetoshi Fujita
    • Naoko Yagishita
    • Yoshihisa Yamano
    • Yukari Okubo
    • Kusuki Nishioka
    • Toshihiro Nakajima
  • View Affiliations

  • Published online on: October 11, 2017     https://doi.org/10.3892/mmr.2017.7764
  • Pages:9203-9209
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Abstract

Rheumatoid arthritis (RA) is a chronic inflammatory articular disease that is characterized by synovial hyperplasia. A number of signaling pathways are associated with the development and induced symptoms of RA. Notably, patients with RA have increased protein citrullination and generation of auto‑antibodies against citrullinated proteins. Genome wide association studies have revealed that peptidyl‑arginine deiminase 4 (PADI4) is an enzyme implicated in citrullination in the RA synovium. Autoantibodies targeting citrullinated proteins are used as diagnostic markers in patients with RA. The functions associated with citrullinated proteins are thought to induce autoimmunity, however, the regulatory mechanisms of citrullination via PADI4 are unclear. The group has previously cloned an E3 ubiquitin ligase, synoviolin (SYVN1), from the RA synovium, demonstrating that SYVN1 serves critical roles in synovial hyperplasia. The data indicated that the endoplasmic reticulum (ER) associated degradation system, which involves SYVN1, may have important roles in the proliferation of synoviocytes. In addition, ubiquitination by SYVN1 is associated with fibrosis, inflammation and cytokine production via the regulation of ER stress signals and quality control of proteins. The present study investigated the crosstalk between the representative post‑translational signaling processes, citrullination and ubiquitination. The results revealed that PADI4 interacted with SYVN1 directly and that overexpression of PADI4 suppressed the ubiquitination of proteins. Thus, a reduction in ER stress induced by PADI4 may abrogate the initiation of chronic RA by suppressing the proliferative signals of RA synoviocytes.

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December 2017
Volume 16 Issue 6

Print ISSN: 1791-2997
Online ISSN:1791-3004

2016 Impact Factor: 1.692
Ranked #19/128 Medicine Research and Experimental
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APA
Aratani, S., Fujita, H., Yagishita, N., Yamano, Y., Okubo, Y., Nishioka, K., & Nakajima, T. (2017). Inhibitory effects of ubiquitination of synoviolin by PADI4. Molecular Medicine Reports, 16, 9203-9209. https://doi.org/10.3892/mmr.2017.7764
MLA
Aratani, S., Fujita, H., Yagishita, N., Yamano, Y., Okubo, Y., Nishioka, K., Nakajima, T."Inhibitory effects of ubiquitination of synoviolin by PADI4". Molecular Medicine Reports 16.6 (2017): 9203-9209.
Chicago
Aratani, S., Fujita, H., Yagishita, N., Yamano, Y., Okubo, Y., Nishioka, K., Nakajima, T."Inhibitory effects of ubiquitination of synoviolin by PADI4". Molecular Medicine Reports 16, no. 6 (2017): 9203-9209. https://doi.org/10.3892/mmr.2017.7764