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Anti-arthritic Effect of the Spirocyclopiperazinium Salt Compound LXM-15 in Rats and Its Underlying Mechanism

  • Ning Li
  • Qin Liu
  • Run Tao Li
  • Qi Sun
  • Yi Min Jiang
  • Jia YeEmail author
Original Article


In this study, we aimed to evaluate the effects of the spirocyclopiperazinium salt compound LXM-15 on rheumatoid arthritis induced by complete Freund’s adjuvant (CFA) in rats and investigate the underlying mechanism. The results showed that LXM-15 significantly inhibited the paw edema and ankle swelling, and alleviated the mechanical allodynia and thermal hyperalgesia responses in the CFA rats. The histopathological results revealed that LXM-15 ameliorated the infiltration of inflammatory cells and joint destruction. The micro-CT scan showed that LXM-15 alleviated bone erosion and increased BMD in the ankle joints of the CFA rats. Western blot analyses showed that LXM-15 significantly reduced the upregulation of phospho-JAK2, phospho-STAT3, phospho-IκBα, and phospho-NF-κBp65, and the overexpression of BDNF in the dorsal root ganglions. ELISA result showed that the protein level of TNF-α in the paw tissue was decreased upon LXM-15 treatment. RT-PCR analysis showed that the mRNA expression levels of c-fos and BDNF were reduced in the dorsal root ganglions by LXM-15 treatment. The LXM-15-mediated anti-arthritic effects were abolished by treatment with hexamethonium (a peripheral nicotinic receptor antagonist), atropine methylnitrate (a peripheral muscarinic receptor antagonist), methyllycaconitine citrate (a selective α7 nicotinic receptor antagonist), and tropicamide (a selective M4 muscarinic receptor antagonist). Collectively, our results demonstrate that LXM-15 exerts anti-arthritic effects in CFA rats. The underlying mechanism may be related to the activation of the peripheral α7 nicotinic receptor and M4 muscarinic receptor by LXM-15, further suppressing the activation of the JAK2/STAT3 and IκBα/NF-κBp65 signaling pathways and, eventually, inhibiting the expression levels of TNF-α, BDNF, and c-fos.


spirocyclopiperazinium salt compound LXM-15 rheumatoid arthritis α7 nicotinic receptor M4 muscarinic receptor JAK2/STAT3 signaling pathway IκBα/NF-κBp65 signaling pathway 


Funding Information

This research was supported by grants from the National Natural Science Foundation of People’s Republic of China (grant nos. 81870876 and 81470050).

Compliance with Ethical Standards

The animal-related protocols were approved by the Institutional Animal Care and Use Committee of Peking University (ethics approval number: LA2014189); the experiments were performed in accordance with the ethics guidelines of the International Association for the Study of Pain [30].

Conflict of Interest

The authors declare that they have no conflicts of interest.


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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2020

Authors and Affiliations

  • Ning Li
    • 1
  • Qin Liu
    • 1
  • Run Tao Li
    • 2
  • Qi Sun
    • 2
  • Yi Min Jiang
    • 3
  • Jia Ye
    • 1
    Email author
  1. 1.Department of Molecular and Cellular Pharmacology, School of Pharmaceutical SciencesPeking UniversityBeijingPeople’s Republic of China
  2. 2.Department of Chemical Biology, School of Pharmaceutical SciencesPeking UniversityBeijingPeople’s Republic of China
  3. 3.Medical and Healthy Analysis CenterPeking UniversityBeijingPeople’s Republic of China

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