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| Regulating effect of Yiqi Yangyin Xiaoying Decoction on B cell activation in autoimmune thyroiditis model rats |
| LI Yang1,2 MU Yafeng3 ZUO Xinhe1,2,3 TIAN Man1,2▲ ZHAO Yong1,2 |
1.Thyroid Disease Clinic Center, Hubei Provincial Hospital of Traditional Chinese Medicine, Hubei Province, Wuhan 430070, China;
2.Thyroid Disease Clinic Center, Hubei Province Academy of Traditional Chinese Medicine, Hubei Province, Wuhan 430070, China;
3.the First Clinical College, Hubei University of Chinese Medicine, Hubei Province, Wuhan 430061, China |
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Abstract Objective To observe the regulating effect of Yiqi Yangyin Xiaoying Decoction on B lymphocyte activation in rats with autoimmune thyroiditis (AIT) model. Methods According to random number table method, 50 female SD rats at four-five weeks were divided into normal control group, model group, low, medium and high dose Yiqi Yangyin Xiaoying Decoction groups, with 10 rats in each group. The AIT model was made by subcutaneous injection of porcine thyroglobulin and feed with high iodine water. The low, medium and high dose Yiqi Yangyin Xiaoying Decoction groups were given 6, 12 and 24 g/kg solution of Yiqi Yangyin Xiaoying Decoction by gavage, respectively. Normal control group and model group were given the same amount of normal saline by gavage, intervention for six weeks. Serum levels of thyroid stimulating hormone (TSH), thyroid globulin antibody (TGAb), thyroid peroxidase antibody (TPOAb) and the concentration of serum B cell activating factor (BAFF) were determined by enzymy-linked immunosorbent assay. The expression level of interleukin-10 (IL-10) in thyroid tissues of rats was detected by immunohistochemistry. Results Compared with the normal control group, serum TSH, TGAb, TPOAb levels and BAFF level in model group were increased, while the expression level of IL-10 in thyroid tissue was decreased, and the differences were highly statistically significant (all P ＜ 0.05). Compared with model group, the concentrations of TSH, TgAb and TPOAb in the medium and high dose Yiqi Yangyin Xiaoying Decoction groups were decreased, and the differences were highly statistically significant (all P ＜ 0.01); the concentration of TGAb and TPOAb in low dose Yiqi Yangyin Xiaoying Decoction group were decreased, and the differences were highly statistically significant (P ＜ 0.01); BAFF content in all dose groups of Yiqi Yangyin Xiaoying Decoction decreased, and the relative expression level of IL-10 in thyroid tissue increased, and the differences were statistically significant (all P < 0.05). TSH concentrations in the medium and high dose Yiqi Yangyin Xiaoying Decoction groups were lower than those in the low dose Yiqi Yangyin Xiaoying Decoction group, and the differences were highly statistically significant (P ＜ 0.05 or P ＜ 0.01). The concentration of TGAb in the high dose Yiqi Yangyin Xiaoying Decoction group was lower than that in the medium and low dose Yiqi Yangyin Xiaoying Decoction groups, and that in the medium dose Yiqi Yangyin Xiaoying Decoction group was lower than that in the low dose Yiqi Yangyin Xiaoying Decoction group, and the differences were highly statistically significant (P ＜ 0.05 or P ＜ 0.01). The content of BAFF in the high dose Yiqi Yangyin Xiaoying Decoction group was lower than that in the low and medium dose Yiqi Yangyin Xiaoying Decoction groups, and the differences were statistically significant (all P ＜ 0.05). The expression level of IL-10 in the medium and high dose Yiqi Yangyin Xiaoying Decoction groups was higher than that in the low dose Yiqi Yangyin Xiaoying Decoction group, and the differences were statistically significant (all P ＜ 0.05). Conclusion Yiqi Yangyin Xiaoying Decoction decreases TSH, TGAb and TPOAb levels in AIT rats, and improves immune imbalance, which may be related to the mechanism of inhibiting B lymphocyte activation and upregulating thyroid IL-10 expression.
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