Hongyan Zhao1, Huihui Xu2, Senyan Qiao3, Cheng Lu4, Gui Wang2, Meijie Liu1, Baosheng Guo5, Yong Tan4, Dahong Ju1, Cheng Xiao6. 1. Experimental Research Center, China Academy of Chinese Medical Science, Beijing, China; Institute of Basic Theory for Chinese Medicine, China Academy of Chinese Medical Science, Beijing, China. 2. Institute of Clinical Medicine, China-Japan Friendship Hospital, Beijing, China; Beijing University of Chinese Medicine, Beijing, China. 3. Department of Pathology, The Third People's Hospital of Zhengzhou, Henan, China. 4. Institute of Basic Research in Clinical Medicine, China Academy of Chinese Medical Science, Beijing, China. 5. Institute for Advancing Translational Medicine in Bone & Joint Diseases, School of Chinese Medicine, Hong Kong Baptist University, China. 6. Institute of Clinical Medicine, China-Japan Friendship Hospital, Beijing, China. Electronic address: xc2002812@126.com.
Abstract
OBJECTIVE: To investigate the effect of boldine isolated from Litsea cubeba on collagen-induced arthritis (CIA) rats and explore the molecular mechanism predicted by network pharmacology. MATERIAL AND METHODS: CIA rats were orally administered with boldine. The bone destruction of paws was analyzed by histologic examination, tartrate-resistant acid phosphatase (TRACP) staining and micro-computed tomography. Prediction of signal pathway associated with boldine network molecules and CIA genes was applied by the network pharmacology analysis. The expressions of osteoprotegerin (OPG), receptor activator of nuclear factor-κB (RANK) and its ligand (RANKL) in the ankle were detected by immunohistochemistry. In vitro osteoclasts were cultured in the presence of variable doses of boldine and the RANK expressions were evaluated using Real-time polymerase chain reaction and western blot. RESULTS: Boldine reduced ankle swelling, alleviated pathological damage and significantly prevented bone destruction in CIA rats. Consistent with this, enzyme linked immunosorbent assay revealed boldine decreased serum TRACP5b levels and osteoclast number in the ankle region by TRACP staining from CIA rats. The network pharmacology analysis indicated that RANK signaling in osteoclasts was the most significant canonical pathway associated with boldine network molecules and CIA genes, which was verified by the increased expression of OPG, reduced expression of RANK, RANKL and RANKL/OPG in boldine-treated CIA rats. The in vitro study further confirmed that boldine inhibited osteoclastogenesis by inhibiting the RANKL/RANK signaling pathway. CONCLUSION: Taken together, our study first indicates that boldine from Litsea cubeba suppresses osteoclastogenesis, improves bone destruction by down-regulating the OPG/RANKL/RANK signal pathway and may be a potential therapeutic agent for rheumatoid arthritis.
OBJECTIVE: To investigate the effect of boldine isolated from Litsea cubeba on collagen-induced arthritis (CIA) rats and explore the molecular mechanism predicted by network pharmacology. MATERIAL AND METHODS: CIA rats were orally administered with boldine. The bone destruction of paws was analyzed by histologic examination, tartrate-resistant acid phosphatase (TRACP) staining and micro-computed tomography. Prediction of signal pathway associated with boldine network molecules and CIA genes was applied by the network pharmacology analysis. The expressions of osteoprotegerin (OPG), receptor activator of nuclear factor-κB (RANK) and its ligand (RANKL) in the ankle were detected by immunohistochemistry. In vitro osteoclasts were cultured in the presence of variable doses of boldine and the RANK expressions were evaluated using Real-time polymerase chain reaction and western blot. RESULTS:Boldine reduced ankle swelling, alleviated pathological damage and significantly prevented bone destruction in CIA rats. Consistent with this, enzyme linked immunosorbent assay revealed boldine decreased serum TRACP5b levels and osteoclast number in the ankle region by TRACP staining from CIA rats. The network pharmacology analysis indicated that RANK signaling in osteoclasts was the most significant canonical pathway associated with boldine network molecules and CIA genes, which was verified by the increased expression of OPG, reduced expression of RANK, RANKL and RANKL/OPG in boldine-treated CIA rats. The in vitro study further confirmed that boldine inhibited osteoclastogenesis by inhibiting the RANKL/RANK signaling pathway. CONCLUSION: Taken together, our study first indicates that boldine from Litsea cubeba suppresses osteoclastogenesis, improves bone destruction by down-regulating the OPG/RANKL/RANK signal pathway and may be a potential therapeutic agent for rheumatoid arthritis.