Journal of Traditional Chinese Medicine ›› 2022, Vol. 42 ›› Issue (1): 73-82.DOI: 10.19852/j.cnki.jtcm.20210324.002

• Research Articles • Previous Articles     Next Articles

Effect of moxibustion on autophagy and the inflammatory response of synovial cells in rheumatoid arthritis model rats

Feng HAO1,2, Qiang WANG3, Lei LIU4, Libin WU4, Ronglin CAI4,5, Jiajia SANG6, Jun HU7, Jie WANG4,5, Qing YU4,5, Lu HE4,5, Yingchao SHEN3, Yiming MIAO3, Ling HU4,5, Zijian WU4,5()   

  1. 1 College of Acupuncture-moxibustion and Tuina, Nanjing University of Chinese Medicine, Nanjing 210023, China
    2 Translational Medicine Research Center of Nanjing University of Chinese Medicine, Nanjing 210023, China
    3 Changshu Hospital Affiliated to Nanjing University of Chinese Medicine, Changshu 215500, China
    4 College of Acupuncture-moxibustion and Tuina, Anhui University of Chinese Medicine, Hefei 230012, China
    5 Institute of Acupuncture and Meridian, Anhui Academy of Chinese Medicine, Hefei 230038, China
    6 Affiliate Hospital of Nanjing University of Chinese Medicine/Jiangsu Province of Chinese Medicine, Nanjing 210029, China
    7 The first clinical medical college of Nanjing University of Chinese Medicine, Nanjing 210029, China
  • Received:2020-11-21 Accepted:2021-02-16 Online:2022-02-15 Published:2021-03-24
  • Contact: Ling HU,Zijian WU
  • About author:WU Zijian, HU Ling, College of Acupuncture-moxibustion and Tuina, Anhui University of Chinese Medicine, Hefei, 230012, China; Institute of Acupuncture and Meridian, Anhui Academy of Chinese Medicine, Hefei, 230038, China. wuzijian@ahtcm.edu.cn; hulingtcm@126.com
  • Supported by:
    University Natural Science Research Program of Jiangsu: Study on the Mechanism Of Moxibustion Regulating Autophagy in RA synovial Fibroblasts Based on PI3K/Akt/mTOR Pathway(18KJB360005);973 Program of China: Effect and Biological Mechanism of Heat, Light and Smoking in Moxibustion(2015CB554504);Priority Academic Program Development of Jiangsu Higher Education Institutions(Integration of Chinese and Western Medicine);Exploration and Scientific Research Project of Anhui University of Chinese Medicine: Clinical Application and Mechanism Study of Moxibustion(2016ts024)

Abstract:

OBJECTIVE: To investigate the effect of moxibustion on synovitis and the autophagy of synoviocytes in rheumatoid arthritis (RA).

METHODS: Forty Sprague-Dawley rats were randomly divided into a normal group, model group, moxibustion group, cigarette moxibustion group, and medicine group, with eight rats included in each group. The RA model was established by subcutaneous injection of complete Freund's adjuvant into the left posterior toe. Rats in the model group were not interfered with. In the moxibustion group, rats were treated by moxibustion, where a 1-cm diameter moxa stick was applied at the left Zusanli (ST 36) point. The distance of the moxa stick to the skin was 2 cm and moxibustion was completed for 20 min daily for 15 d total. In the cigarette moxibustion group, the moxa stick was replaced by a common cigarette. In the medicine group, rats were treated with a tripterygium glycoside suspension (8 mg/kg) once a day for 15 d total. In each group, the left hind limb toe volume was measured with a toe volume meter; the synovial cells were observed by hematoxylin and eosin staining; the interleukin (IL)-4, IL-6, IL-10, IL-1β, IL-23, IL-17, and tumor necrosis factor (TNF)-α levels in serum were measured by enzyme-linked immunosorbent assay; the erythrocyte sedimentation rate (ESR) were detected by Westergren sedimentation rate testing; the C-reactive protein (CRP) and rheumatoid factor (RF) levels in serum were detected by rate nephelometry; the expression levels of ULK1, autophagy-associated protein (Atg)3, Atg5, and Atg12 messenger RNA (mRNA) in synovium were detected by real time-quantitative polymerase chain reaction (RT-qPCR); and the protein expression levels of phosphatidylinositol-3-kinase (PI3K), protein kinase B (Akt), mammalian target of rapamycin (mTOR), LC3-Ⅱ, beclin-1, phosphorylated-PI3K (p-PI3K), p-Akt, p-mTOR in synovium were detected by Western blotting.

RESULTS: Among the RA model rats, joint swelling, an inflammatory reaction, and the proliferation of synovial tissue were obvious and the signal of the PI3K/Akt/mTOR pathway was active, while autophagy was inhibited. Moxibustion at Zusanli (ST36) or intragastric administration of Tripterygium wilfordii glycosides could alleviate the inflammatory reaction of RA rats; relieve the swelling of the toes; downregulate the levels of ESR, CRF, RF; lower the levels of IL-6, IL-1β, TNF-α, and IL-17; and increase the IL-4 and IL-10. At the same time, the mRNA expression levels of ULK1, Atg3, Atg5, and Atg12 and those of LC3-Ⅱ and beclin-1 were increased, while the PI3K, Akt, mTOR, p-PI3K, p-Akt, p-mTOR were decreased. Cigarette moxibustion did not significantly reduce the swelling of the toe joint in RA rats, and was not as good as that of moxibustion or Tripterygium wilfordii polyglycosides in the effects of inflammation relief and the influences of the levels of ESR, CRF, RF. While cigarette moxibustion has a weak effect to affect the expression of corresponding molecules in autophages and the expression level of the autophagy biomaker in synovial tissue. Moxibustion and tripterygium glycosides can significantly reduce the joint swelling, relieve synovitis and synovial hyperplasia, and inhibit the PI3K/ Akt/mTOR signaling pathway to increase autophagy in a manner superior to cigarette moxibustion.

CONCLUSION: Moxibustion can limit the proliferation of synoviocytes in RA rats by inhibiting the PI3K/Akt/mTOR signaling pathway, promoting autophagy, effectively reducing synovitis, and alleviating joint swelling.

Key words: moxibustion, arthritis, rheumatoid, synovitis, autophagy

Cite this article

Feng HAO, Qiang WANG, Lei LIU, Libin WU, Ronglin CAI, Jiajia SANG, Jun HU, Jie WANG, Qing YU, Lu HE, Yingchao SHEN, Yiming MIAO, Ling HU, Zijian WU. Effect of moxibustion on autophagy and the inflammatory response of synovial cells in rheumatoid arthritis model rats[J]. Journal of Traditional Chinese Medicine, 2022, 42(1): 73-82.