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Dual role of shikonin in early and late stages of collagen type II arthritis

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Objective To investigate the anti-inflammatory or immunomodulatory effect of shikonin on early stage and established murine collagen-induced arthritis (CIA). Methods Mouse were injected intraperitoneally with shikonin (5 mg/kg) for 10 days along before or after the onset of CIA. The arthritis response was monitored visually by macroscopic scoring. Reverse transcription-polymerase chain reaction and western blotting were employed to determine the mRNA and protein expression of cytokine in patella with adjacent synovium in CIA mouse. Histology of knee was used to assess the occurrence of cartilage destruction and bone erosion. Results Shikonin (5 mg/kg) treatment along had no effect on macroscopic score and incidence of arthritis on early stage of CIA. However, a pronounced amelioration of macroscopic score and cartilage destruction was found in mouse treated with shikonin on established CIA for 10 days. Moreover, The mRNA levels of Th1 cytokines [tumor necrosis factor-α and interleukin (IL)-12] was significantly inhibited both in the synovial tissue and in the articular cartilage in treated groups compared with those in control groups, whereas the mRNA and protein levels of Th2 cytokines (IL-10 and IL-4) remained elevated throughout the treatment period. Moreover, the inflammatory cytokine, the mRNA and protein levels of IL-6 was down-regulated in mice with established CIA after treatment with shikonin. T-box expressed in T cells (T-bet) mRNA levels were decreased in shikonin compared with control group, and GATA-3 mRNA levels were higher than that in control group. Conclusion Shikonin treatment on established CIA can inhibit Th1 cytokines expression and induce Th2 cytokines expression in mice with established CIA. The inhibited effect of shikonin on Th1 cytokines expression may be mediated not only by inhibiting Th1 responses through T-bet mechanism, but also by inducing anti-inflammatory mediators such as IL-10 and IL-4 through a GATA-3 dependent mechanism.

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Acknowledgments

The authors thank Y. Li, Ph.D. (Department of rheumatology, The Second Affiliated Hospital, Harbin Medical University, Harbin, China) for her help in conducting the study and for reviewing the manuscript. This work were supported by the Science Foundation of Heilongjiang traditional Chinese medicine university and Dr Science Foundation of Harbin Medical University.

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Correspondence to Feng-shan Zhang.

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Dai, Q., Fang, J. & Zhang, Fs. Dual role of shikonin in early and late stages of collagen type II arthritis. Mol Biol Rep 36, 1597–1604 (2009). https://doi.org/10.1007/s11033-008-9356-7

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