https://doi.org/10.4081/ejh.2021.3202

New bitongling (NBTL) ameliorates rheumatoid arthritis in rats through inhibiting JAK2/STAT3 signaling pathway

Vol. 65 No. 1 (2021)
Submitted: 19 November 2020
Accepted: 12 January 2021
Published: 17 February 2021
Rheumatoid arthritis, NBTL, JAK2/STAT3, FLS, inflammation
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Authors

Xiang Li
https://orcid.org/0000-0001-6496-9353
Affiliated Hospital of Nanjing University of Chinese Medicine; Jiangsu Province Hospital of Chinese Medicine, Nanjing, China.
Yu Xie
Jiangsu Province Hospital of Chinese Medicine, Nanjing, China.
An Kang
School of Pharmacology, Nanjing University of Chinese Medicine, Nanjing, China.
Yue Wang
yuewang@mail.com
Affiliated Hospital of Nanjing University of Chinese Medicine; Jiangsu Province Hospital of Chinese Medicine, Nanjing, China.

Rheumatoid arthritis (RA) is featured by a variety of physical symptoms and fibroblast-like synoviocytes (FLSs) abnormal proliferation. Increasing evidence has demonstrated that traditional Chinese medicine exerts an important role in RA treatment. New bitongling (NBTL) as one of the traditional Chinese medicine has been reported to be involved in the progression of RA, but the exact mechanism is unclear. In our study, we intended to investigate the effect of NBTL on RA to identify the mechanisms related to JAK2/STAT3 signaling pathway. Extracts of Tripterygium wilfordii (TW), a traditional Chinese herbal medicine, have been widely used for treating RA in China for several decades, so, TW was used as a positive control drug for TBNL. RA rats were constructed by immunization with collagen type II to evaluate the action of NBTL in vivo. Body weight and arthritic index were evaluated. Hematoxylin and Eosin staining was performed to analysis the morphological changes of ankle joints tissue. TUNEL and flow cytometry were performed to examine cell apoptosis, while CCK8 and Ethynyl-2′-deoxyuridine (EdU) were performed to examine cell proliferation. In addition, the markers of inflammation were detected by Western blot, ELISA, and RT-qPCR. Firstly, we find that rats treated with NBTL or TW not only reduced swelling degree and bone destruction, but also repressed IL-1 β and IL-6 levels. In addition, NBTL and TW could increase the weight of rats, and promote the level of IL-10 and IL-4 in vivo. Furthermore, NBTL inhibited inflammation of FLS, induced cell apoptosis and hindered cell proliferation, which was reversed by dipeptidyl peptidase (DPP), a JAK2/STAT3 pathway activator. Taken together, NBTL potentially retarded RA via JAK2/STAT3 pathway, highlighting novel mechanisms associated with RA.

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How to Cite

Li, X., Xie, Y., Kang, A., & Wang, Y. (2021). New bitongling (NBTL) ameliorates rheumatoid arthritis in rats through inhibiting JAK2/STAT3 signaling pathway. European Journal of Histochemistry, 65(1). https://doi.org/10.4081/ejh.2021.3202

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